JP6875845B2 - Image reader and image forming device equipped with it - Google Patents

Description

The present invention relates to an image reading device including a transparent body and a reading unit for reading an image through the transparent body, and an image forming device such as a copying machine, a multifunction device, a facsimile machine, or the like provided with the transparent body.

The image reading device is generally adapted to read an image by a reading unit via a transparent body. For example, an image reading device irradiates a document from a light source through a transparent body (specifically, a document scanning glass) having an image reading surface serving as a reference surface for reading the document, and reflects the light from the document through the transparent body. The image of the original is read by the reading unit by receiving the reflected light.

As such an image reading device, for example, an image of a document conveyed in the sub-scanning direction so as to pass over the transparent body is scanned in the main scanning direction at a predetermined reading position through the transparent body. Examples thereof include a configuration in which the reading unit reads.

By the way, in an image reading device that reads an image through a transparent body by a reading unit, if foreign matter such as dust adheres to a portion corresponding to the reading position of the transparent body, the read image is blocked and the reading unit receives the image. Image defects such as streaks occur in the image read.

In the conventional image reading device, the reflected light from the white member to be read (specifically, the member to be read for shading correction) is read by the reading unit through the transparent body, and based on the read data (specifically, the reading data is read). Specifically, it was determined whether or not foreign matter was attached to the portion corresponding to the reading position of the transparent body (depending on whether or not each pixel exceeded the threshold value or was above the threshold value).

Therefore, the density of the first foreign substance (for example, a ball pen, a magic pen, etc.) whose brightness is equal to or less than the predetermined brightness or smaller than the predetermined brightness is darker than the predetermined density or darker than the predetermined density at the portion corresponding to the reading position of the transparent body. Reflection from the white member to be read when colored ink or black foreign matter such as paper dust whose density is darker than the predetermined density or darker than the predetermined density is attached. Since there is a large difference between the value of the light read data and the value of the read data of the reflected light from the first foreign matter (blackish foreign matter), it is easy to determine that the first foreign matter is a foreign matter. Therefore, it can be determined that the first foreign matter is definitely a foreign matter (black foreign matter).

On the other hand, a second foreign substance having a brightness greater than or equal to the predetermined brightness (for example, a paste having a density of a sticker or the like lighter than the predetermined density or a light color less than or equal to the predetermined density) is located at a portion corresponding to the reading position of the transparent body. Or, if white foreign matter such as paper dust with a lighter color than the predetermined density or lighter color than the predetermined density is attached, the reflected light is read from the white member to be read. Since the difference between the data value and the value of the read data of the reflected light from the second foreign substance (white foreign substance) is small or absent, it is difficult or impossible to determine that the second foreign substance is the second foreign substance. Therefore, it is not possible to reliably determine that the second foreign matter is a foreign matter (white foreign matter).

In this regard, Patent Document 1 reads a white first surface portion with a reading unit to acquire first image data, and reads a second surface portion having a light reflectance smaller than that of the first surface portion. When the second image data is acquired by reading in the unit, the difference is calculated for each corresponding pixel between the first image data and the second image data, and the difference is less than or less than a preset value. Discloses a configuration in which it is determined that foreign matter is attached to a portion corresponding to the reading position of the transparent body. Further, in Patent Document 1, a second white surface portion is read by a reading unit to perform shading correction for calculating the ratio of input image data to shading data, and the light reflectance is smaller than that of the first surface portion. When the difference between the value of the dust detection data obtained by reading the surface portion of the image with the reading unit is greater than or equal to the preset value for each pixel, the value of the dust detection data is set to the reading position of the transparent body. A configuration for determining whether a foreign substance is attached to a corresponding portion is disclosed.

JP-A-2010-177746

However, in any of the configurations described in Patent Document 1, the control configuration for determining whether or not foreign matter is attached to the portion corresponding to the reading position of the transparent body is complicated.

Therefore, the present invention is an image reading device including a transparent body and a reading unit that reads an image through the transparent body, and although it has a simple control configuration, the reading position of the transparent body regardless of the brightness of a foreign substance. It is an object of the present invention to provide an image reading device capable of determining whether or not foreign matter is attached to a portion corresponding to the above, and an image forming device provided with the image reading device.

The present invention provides an image reading device and an image forming device according to the following first and second aspects in order to solve the above problems.

(1) Image Reading Device of the First Aspect The image reading device of the first aspect according to the present invention is an image reading device including a transparent body and a reading unit for reading an image through the transparent body. 1 light reflectance read member, a second light reflectivity read member having a light reflectance smaller than that of the first light reflectivity read member, and the first light reflectivity read member via the transparent body. A first foreign matter adhesion determining means for determining whether or not foreign matter is attached to a portion corresponding to the reading position of the transparent body based on the first read data read by reading the reflected light from the transparent body. The light reflected from the member to be read with the second light reflectance is read by the reading unit through the transparent body, and a foreign substance is generated at a position corresponding to the reading position of the transparent body based on the read second reading data. It includes a second foreign matter adhesion determining means for determining whether or not it is adhered, and a single member to be read provided with the first light reflectance read member and the second light reflectance read member. The single component to be read is a rotating member arranged so as to face the transparent body, and the first light reflectance read member is located in a first region of the rotating member in the circumferential direction. The second light reflectance read member is provided in a second region other than the first region in the circumferential direction of the rotating member, and the rotating member is read by the first foreign matter adhesion determining means. The first rotation position in which the unit reads the reflected light from the first light reflectance read member in the rotating member through the transparent body, and the reading unit in the second foreign matter adhesion determining means passes through the transparent body. The rotating member is selectively rotatable from the second rotation position where the reflected light from the second light reflectance read member is read, and the rotating member is a belt member and is read. The unit is characterized by reading a flat portion of the belt member .

(2) The image reading apparatus of the second embodiment of the image reading apparatus invention of the second aspect is an image reading apparatus having a reading unit to read an image through a transparent body, said transparent body, image The sub-reading unit, the first light reflectance read member, the second light reflectance read member having a light reflectance smaller than that of the first light reflectance read member, and the transparent body. First light reflectance The light reflected from the member to be read is read by the reading unit, and based on the read first reading data, it is determined whether or not foreign matter is attached to the portion corresponding to the reading position of the transparent body. The light reflected from the member to be read with the second light reflectance is read by the sub-reading unit via the first foreign matter adhesion determining means and the transparent body, and the transparent body is based on the read second reading data. A second foreign matter adhesion determining means for determining whether or not foreign matter is attached to a portion corresponding to the reading position, a first reading component provided with the first light reflectance read member, and the first It includes a second component to be read, which is separate from the component to be read and is provided with the second light reflectance read member, and the transparent body is the reading unit in the first foreign matter adhesion determining means. Is the first moving position for reading the reflected light from the first light reflectance reading member of the first component to be read through the transparent body, and the sub-reading unit in the second foreign matter adhesion determining means. With the same or substantially the same position as the position read by the reading unit of the transparent body, the second moving position for reading the reflected light from the second light reflectance reading member in the second reading component member. It is characterized by being able to move back and forth.

(3) The image forming apparatus according to the image forming apparatus according to the invention is characterized in that the with the image reading apparatus of the first aspect or the second state like according to the present invention.

According to the present invention, it is possible to determine whether or not a foreign substance is attached to a portion corresponding to the reading position of the transparent body regardless of the brightness of the foreign substance, even though the control configuration is simple.

It is a schematic perspective view which shows the appearance of the image forming apparatus provided with the image reading apparatus which concerns on embodiment of this invention. It is the schematic front view which shows the image forming apparatus shown in FIG. 1 perspectively. It is the schematic front view which shows the image reading device part in the image forming apparatus shown in FIG. 1 perspectively. An example of the foreign matter adhesion determination configuration of the image reading device according to the first embodiment, the roller is a single component to be read provided with the first light reflectance read member and the second light reflectance read member. It is a schematic front view which shows typically the example which made it a member, and (a) shows the state which the 1st light reflectance read member of a roller member faces a part corresponding to a reading position in a document reading glass. FIG. 3B is a diagram showing a state in which the second light reflectance read member of the roller member faces a portion of the original reading glass corresponding to the reading position. FIG. 5 is a schematic side view showing an example in which the length of the first light reflectance read member in the circumferential direction of the roller member shown in FIG. 4 is larger than the length of the second light reflectance read member in the circumferential direction. FIG. 5 is a schematic configuration diagram showing a system configuration for determining foreign matter adhesion by an example of a first driving device that rotationally drives the roller member shown in FIG. Another example of the foreign matter adhesion determination configuration of the image reading device according to the first embodiment, which is a single component to be read provided with the first light reflectance read member and the second light reflectance read member. It is a schematic front view which shows typically the example which made the belt member, (a) is the state which the 1st light reflectance read member of a belt member faces a part corresponding to the reading position in a document reading glass. (B) is a diagram showing a state in which the second light reflectance read member of the belt member faces a portion of the original reading glass corresponding to the reading position. FIG. 5 is a schematic side view showing an example in which the length of the first light reflectance read member in the circumferential direction of the belt member shown in FIG. 7 is larger than the length of the second light reflectance read member in the circumferential direction. FIG. 5 is a schematic configuration diagram showing a system configuration for determining foreign matter adhesion by an example of a second driving device that rotationally drives the belt member shown in FIGS. 7 and 8. Yet another example of the foreign matter adhesion determination configuration of the image reading device according to the first embodiment, which is a single read configuration provided with a first light reflectance read member and a second light reflectance read member. It is a schematic front view which shows typically the example which used the member as a guide member, and (a) is the 1st light reflectance reading member of a guide member facing a portion corresponding to a reading position in a document reading glass. It is a figure which shows the state, (b) is a figure which shows the state which the 2nd light reflectance read member of a guide member faces a place corresponding to the reading position in a document reading glass. FIG. 5 is a schematic configuration diagram showing a system configuration for determining foreign matter adhesion by an example of a third driving device that reciprocally drives the guide member shown in FIG. FIG. 5 is a schematic configuration diagram showing a system configuration for determining foreign matter adhesion according to another example of a third driving device that reciprocates and drives the guide member shown in FIG. 10. An example of the foreign matter adhesion determination configuration of the image reading device according to the second embodiment, the first light reflectance read member provided with the first light reflectance member is used as a guide member, and the second light reflectance is read. It is a schematic front view which shows typically the example which made the 2nd component to be read provided with the member a component of the housing in an image reading apparatus, and (a) is the part corresponding to the reading position in the document reading glass. Is a diagram showing a state in which the guide member faces the first light reflectance member to be read, and (b) shows the second light reflection in the constituent member of the housing where the portion corresponding to the reading position in the document reading glass is facing. It is a figure which shows the state which faces the member to be read. FIG. 3 is a schematic configuration diagram showing a system configuration for determining foreign matter adhesion by an example of a fourth driving device that reciprocally drives the document reading glass shown in FIG. 13. Schematic front view schematically showing an example of a foreign matter adhesion determination configuration of the image reading device according to the third embodiment, wherein the reading component provided with the first light reflectance reading member is used as a guide member. (A) is a diagram showing a state in which the first light reflectance read member in the guide member faces a portion corresponding to the reading position in the document reading glass, and (b) is a diagram in the guide member. It is a figure which shows the state which the 1st light reflectance member retracted from the optical path of the light from a scanning body, and opened the part corresponding to the reading position in a document reading glass. FIG. 5 is a schematic configuration diagram showing a system configuration for determining foreign matter adhesion by an example of a fifth driving device that reciprocally drives the guide member shown in FIG. It is a flowchart which shows an example of the processing of the foreign matter adhesion determination operation of the image reading apparatus which concerns on 1st Embodiment to 3rd Embodiment. It is a graph which shows the value of the 1st reading data of each pixel and the 1st threshold value in the main scanning direction in the process of the 1st foreign matter adhesion determination operation in the image reading apparatus which concerns on 1st Embodiment to 3rd Embodiment. It is a graph which shows the value of the 2nd reading data of each pixel and the 2nd threshold value in the main scanning direction in the process of the 2nd foreign matter adhesion determination operation in the image reading apparatus which concerns on 1st Embodiment to 3rd Embodiment. It is a flowchart which shows another example of the process of the foreign matter adhesion determination operation of the image reading apparatus which concerns on 1st Embodiment to 3rd Embodiment.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings.

[Image forming device]
FIG. 1 is a schematic perspective view showing the appearance of an image forming apparatus 100 provided with an image reading apparatus 200 according to an embodiment of the present invention. FIG. 2 is a schematic front view showing the image forming apparatus 100 shown in FIG. 1 perspectively. Further, FIG. 3 is a schematic front view of the image reading device 200 portion of the image forming device 100 shown in FIG. 1 which is seen through. In FIGS. 1 to 3, reference numeral X indicates a main scanning direction (depth direction), reference numeral Y indicates a sub-scanning direction (horizontal direction), and reference numeral Z indicates a vertical direction. There is. Further, in FIGS. 2 and 3, the configuration for determining the adhesion of foreign matter to the document reading glass 213, which will be described later, is not shown.

The image forming apparatus 100 includes an image reading apparatus 200 and an image forming apparatus main body 110 (see FIGS. 1 and 2), and the image forming apparatus main body 110 is based on the reading data (image data) read by the image reading apparatus 200. An image is formed on a recording sheet P (see FIG. 2) such as paper.

The image forming apparatus 100 according to the present embodiment is a monochrome image forming apparatus. Although the image forming apparatus 100 is a monochrome image forming apparatus, it may be, for example, an intermediate transfer type color multifunction device capable of forming a full-color image. Specifically, a so-called tandem color image in which a plurality of electrostatic latent image carriers (specifically, photoconductors) on which toner images are formed are arranged side by side in a predetermined direction (for example, sub-scanning direction Y). It may be a forming device. Further, the image forming apparatus 100 may be another color image forming apparatus.

The image reading device 200 includes an image reading unit 210 for reading an image of the document G (see FIGS. 2 and 3) and a document transporting unit 220 (specifically, an automatic document feeding device) for transporting the document G. The image of the document G (see FIG. 2) conveyed by the document transfer unit 220 via the scanning glass 213 (an example of a transparent body) is read by the image reading unit 210, or the document mounting glass that acts as a document mounting table. The image of the document G placed on the 212 is read by the image reading unit 210, and the scanned image of the document G is output as scanning data (image data).

As shown in FIG. 2, the image forming apparatus main body 110 includes an image forming unit 101 that forms (prints) an image and a sheet conveying unit 102 that conveys the recording sheet P.

The image forming unit 101 includes a photoconductor drum 11, a charging device 12, an optical scanning device 13, a developing device 14, a transfer device 15, a static elimination device 16, a drum cleaning device 17, and a fixing device 18.

The charger 12 uniformly charges the surface of the photoconductor drum 11 to a predetermined potential. The optical scanning device 13 exposes the uniformly charged surface of the photoconductor drum 11 to form an electrostatic latent image. The developing device 14 develops an electrostatic latent image on the surface of the photoconductor drum 11 to form a toner image on the surface of the photoconductor drum 11.

The transfer device 15 includes a transfer roller 15a, and the transfer roller 15a forms a transfer nip region between the transfer roller 15a and the photoconductor drum 11. Further, the transfer device 15 sandwiches the recording sheet P conveyed by the sheet transfer unit 102 in the transfer nip area and conveys it, and when passing through the transfer nip area, the transfer device 15 records the toner image on the surface of the photoconductor drum 11. It is designed to be transferred to P. The static elimination device 16 is designed to eliminate residual charges on the surface of the photoconductor drum 11. The drum cleaning device 17 is designed to remove and recover residual toner on the surface of the photoconductor drum 11.

The fixing device 18 includes a heating roller 18a and a pressure roller 18b, and forms a fixing nip region between the heating roller 18a and the pressure roller 18b. Further, the fixing device 18 sandwiches the recording sheet P on which the toner image is transferred in the fixing nip area, heats and pressurizes the recording sheet P, and fixes the toner image on the recording sheet P.

The sheet transport section 102 includes a sheet supply section 31 (see FIGS. 1 and 2), supply rollers 32 to 32, transport rollers 33 to 33, a resist roller 34, a sheet transport path W1, a discharge roller 35, and a sheet discharge unit 36 (FIG. 1 and FIG. 2). 1 and FIG. 2).

The sheet supply unit 31 includes a paper feed tray 31a, 31a and a manual paper feed tray 31b, and the recording sheet P loaded on the paper feed tray 31a, 31a or the manual paper feed tray 31b is a sheet transport path by the supply rollers 32 to 32. It is designed to be pulled out toward W1.

The sheet transfer path W1 is provided with a resist roller 34, transfer rollers 33 to 33, a photoconductor drum 11, a transfer roller 15a, a heating roller 18a, a pressure roller 18b, and a discharge roller 35.

The sheet discharge unit 36 includes a discharge tray 36a (see FIGS. 1 and 2), and the recording sheet P discharged to the outside by the discharge roller 35 is placed on the discharge tray 36a.

Further, the sheet transport path W1 includes a reverse path W1r that guides the recording sheet P transported in the opposite direction by the discharge roller 35 to the upstream side of the resist roller 34 so that the front and back sides are reversed.

In the image forming apparatus main body 110 described above, the recording sheet P loaded on the paper feed tray 31a or the manual paper feed tray 31b is directed from the paper feed tray 31a or the manual paper feed tray 31b toward the sheet transport path W1 by the supply roller 32. Is pulled out. The recording sheet P drawn out toward the sheet transfer path W1 is conveyed through the sheet transfer path W1, passes through the transfer roller 33 and the resist roller 34, and is a toner image in the transfer nip region between the photoconductor drum 11 and the transfer roller 15a. Is transcribed. The recording sheet P on which the toner image is transferred has the toner image fixed in the fixing nip area between the heating roller 18a and the pressure roller 18b, is discharged to the outside by the discharge roller 35, and is placed on the discharge tray 36a.

Further, when the image forming apparatus main body 110 forms an image not only on the front surface of the recording sheet P but also on the back surface, the image forming apparatus main body 110 conveys the recording sheet P from the discharge roller 35 to the reversing path W1r in the opposite direction to form the front and back surfaces of the recording sheet. Is inverted and guided to the resist roller 34 again, a toner image is formed and fixed on the back surface of the recording sheet P in the same manner as the front surface of the recording sheet P, and then the toner image is discharged to the discharge tray 36a.

[Image reader]
As shown in FIGS. 2 and 3, the image reading device 200 reads the image (specifically, the image of the document G) through the document reading glass 213 and the document reading glass 213, and the first scanning body 211 (reading unit). An example) and.

In the present embodiment, the image reading device 200 is configured to fix the document G by the document fixing method and read the image of the document G, while moving the document G by the document moving method to read the image of the document G. ing.

Specifically, the image reading device 200 mounts the first scanning body 211 on the document mounting glass 212 while moving the first scanning body 211 to one side Y1 in the sub-scanning direction Y in a state where the document G is placed on the document mounting glass 212. A document fixed scanning configuration for scanning and scanning an image of the placed document G in the main scanning direction X, and a document transporting unit 220 transporting the document G with the first scanning body 211 stopped at a predetermined scanning position S. It has a document moving scanning configuration in which an image of a document G conveyed on a document scanning glass 213 is scanned and scanned in the main scanning direction X while being conveyed in the direction C (sub-scanning direction).

Then, the image reading device 200 conveys the image of the document G which is conveyed by the document conveying unit 220 and passes over the document reading glass 213 in a state where the first scanning body 211 is stopped at the reading position S below the document reading glass 213. The document G placed on the document mounting glass 212 while moving the first scanning body 211 along the lower surface of the document mounting glass 212 to one side Y1 of the sub-scanning direction Y. It is configured to perform a fixed document scanning operation for scanning an image.

The image reading unit 210 is arranged above the image forming apparatus main body 110 in the vertical direction Z. The image reading unit 210 includes a first scanning body 211, a document mounting glass 212, a document reading glass 213, a second scanning body 214, a condenser lens 215, an image sensor 216, and a frame body 217 for accommodating these constituent members. ing.

The first scanning body 211 is provided below the document mounting glass 212 and the document reading glass 213 so as to be reciprocally movable with respect to the frame body 217 along the sub-scanning direction Y, and is provided by an optical system drive unit (not shown). By being driven, it reciprocates in the sub-scanning direction Y. The first scanning body 211 guides the light source 211a (see FIG. 3) that irradiates the document G with light and the first mirror 211b (see FIG. 3) that guides the reflected light Lr (see FIG. 3) from the document G to the second scanning body 214. ) And constitutes a light source unit.

The document mounting glass 212 acts as a transparent flat plate-shaped document mounting plate, and has a rectangular shape slightly larger (by a predetermined size) than the size of the maximum size document G. Both ends of the document mounting glass 212 in the main scanning direction X are placed and held on both edges of the upper opening (not shown) of the frame body 217 in the main scanning direction X. The document mounting glass 212 has an image reading surface that serves as a reading reference surface for the document G.

The document reading glass 213 acts as a transparent flat plate-shaped document reading plate, and has a rectangular shape extending in the main scanning direction X. The document reading glass 213 is placed and held on the other side Y2 of the document mounting glass 212 in the sub-scanning direction Y at both edges of the upper opening of the frame body 217 in the main scanning direction X at both ends in the main scanning direction X. Has been done. The original reading glass 213 has an image reading surface that serves as a reading reference surface for the original G.

The second scanning body 214 includes a second mirror 214a (see FIG. 3), a third mirror 214b (see FIG. 3), and a support member (not shown), and constitutes a mirror unit. The support member in the second scanning body 214 supports the second mirror 214a so as to reflect the light from the first mirror 211b in the first scanning body 211 and guide it to the third mirror 214b. Further, the support member in the second scanning body 214 supports the third mirror 214b so as to reflect the light from the second mirror 214a and guide it to the condenser lens 215.

The condenser lens 215 concentrates the light from the third mirror 214b in the second scanning body 214 on the light receiving surface 216a (see FIG. 3) of the image sensor 216.

The image sensor 216 converts the light from the condenser lens 215 (image light of the document G) into an electric signal as read data (image data). Examples of the image sensor 216 include those including an image sensor such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor).

Further, the optical system drive unit in the image reading device 200 moves the first scanning body 211 to one side Y1 in the sub-scanning direction Y at a constant speed, and moves the second scanning body 214 to the moving speed of the first scanning body 211. It is also configured to move to one side Y1 in the sub-scanning direction Y at a moving speed of 1/2 of that.

The document transport unit 220 is arranged on the upper surface of the image reading unit 210. The document transport unit 220 is rotatably provided around the pivot axis along the sub-scanning direction Y on the back side (opposite the operation side), which is one side in the main scanning direction X, with respect to the image reading unit 210. Has been done. The document transport unit 220 is opened and closed from the front side (operation side) so that the document mounting glass 212 in the image reading unit 210 is opened and closed. The lower surface of the document transport unit 220 also serves as a document holding member that presses the document G placed on the document mounting glass 212 from above.

Specifically, the document transport section 220 automatically transports the document G, and includes a document loading tray 221 (see FIGS. 1 to 3), a supply roller 222, a sheet transfer path W2 (document transfer path), and the like. It includes a first transport roller 223, a resist roller 224, a second transport roller 225, a third transport roller 226, a discharge roller 227, and a document discharge tray 228 (see FIGS. 1 to 3).

The document loading tray 221 is for mounting one or a plurality of documents G, and is arranged on the upper part of the image reading device 200.

The supply roller 222 pulls out the document G placed on the document loading tray 221 one by one, and includes a pickup roller 222a (see FIG. 3), a sabaki roller 222b (see FIG. 3), a separation roller, and a separation pad. Etc. 222c (separation roller in this example) (see FIG. 3). The pickup roller 222a sends the document G placed on the document loading tray 221 from the document loading tray 221 into the sheet transport path W2 along the transport direction C of the document G. The Sabaki roller 222b is arranged on the downstream side of the pickup roller 222a in the transport direction C. The Sabaki roller 222b further conveys the document G sent by the pickup roller 222a to the downstream side in the conveying direction C while sandwiching the document G together with the separating member 222c. The separating member 222c separates (separates) the document G so that the document G conveyed to and from the Saba Killer 222b is one sheet in a state of facing the Saba Killer 222b.

The sheet transport path W2 guides the document G pulled out by the supply roller 222 to the discharge side (below the document loading tray 221) via the document reading glass 213.

The first transfer roller 223, the resist roller 224, the second transfer roller 225, the third transfer roller 226, and the discharge roller 227 are provided on the sheet transfer path W2.

The first transport roller 223 transports the document G pulled out by the supply roller 222 to the resist roller 224.

The resist roller 224 temporarily stops the document G transported to the sheet transport path W2, and restarts the transfer of the document G at a predetermined reading timing. The resist roller 224 transports the document G transported by the first transport roller 223 onto the document reading glass 213.

The second transfer roller 225 conveys the document G conveyed from the document reading glass 213 toward the third transfer roller 226. The third transfer roller 226 conveys the document G conveyed by the second transfer roller 225 toward the discharge roller 227.

The ejection roller 227 ejects the document G conveyed from the third conveying roller 226 toward the document ejection tray 228. The document ejection tray 228 is arranged below the document loading tray 221 and mounts the document G ejected by the ejection roller 227.

In this example, the image reading device 200 further includes a back surface reading unit 229 (an example of a sub reading unit) having a close contact type image sensor 229a (see FIG. 3), and in the document moving reading operation, the back surface reading unit 229 The close contact type image sensor 229a reads the image on the other side (back side) of the document G.

The close contact type image sensor 229a is provided on the downstream side of the third transport roller 226 on the sheet transport path W2 and on the upstream side of the discharge roller 227 in the transport direction C of the document G. The close contact type image sensor 229a is a so-called CIS (Contact Image Sensor), and has a long shape in the main scanning direction X.

Further, the image reading device 200 is provided with an operation unit 230 (see FIG. 1) at an upper portion on the operation side of the image forming device main body 110. The operation unit 230 is provided with a display device 231 (see FIG. 1).

In the image reading device 200 having such a configuration, when the image of the original G is read by the original fixing method, the first scanning body 211 passes through the original mounting glass 212 on the original G placed on the original placing glass 212. While irradiating the incident light Li (see FIG. 3) from the light source 211a, the first scanning body 211 is moved at a constant speed to one side Y1 in the sub-scanning direction Y to scan the image of the document G. Further, the second scanning body 214 is moved to one side Y1 in the sub-scanning direction Y at a moving speed of 1/2 of the moving speed of the first scanning body 211. At this time, the reflected light Lr reflected from the document G is received by the light irradiation from the light source 211a in the first scanning body 211 via the document mounting glass 212. As a result, the image of the document G is read by the first scanning body 211. Specifically, the reflected light Lr (reading light) from the document G illuminated by the light source 211a in the first scanning body 211 is reflected by the first mirror 211b provided in the first scanning body 211, and then the second scanning. The light path is converted by the second mirror 214a and the third mirror 214b of the body 214, and an image is formed on the light receiving surface 216a of the image sensor 216 via the condensing lens 215, where the image light of the document G is read and electrically. Converted to image data.

On the other hand, when the image of the original G is read by the original moving method, the original scanning unit 220 keeps the first scanning body 211 stationary at the reading position S of the original scanning glass 213, and the original scanning unit 220 reads the original G on the image reading surface of the original scanning glass 213. It is conveyed to one side Y1 in the sub-scanning direction Y so that the document G passes over. Specifically, the manuscript G placed on the manuscript loading tray 221 is conveyed between the Sabakira roller 222b and the separating member 222c by the pickup roller 222a, where the manuscript G is separated and separated, and the Sabakira roller 222b is rotationally driven. By being carried, they are conveyed one by one. Then, the document G conveyed by the Sabaki roller 222b is guided by the sheet transfer path W2 and supplied one by one toward the first transfer roller 223, and is conveyed toward the resist roller 224 by the first transfer roller 223. To. The original G, which has been conveyed to the resist roller 224, is conveyed so that the tip ends are aligned by the resist roller 224 and the image surface is brought into close contact with the image reading surface of the original reading glass 213 at a predetermined reading timing.

Further, the first scanning body in a state of being stopped at the reading position S below the document scanning glass 213 via the document scanning glass 213 on one surface (surface) of the document G passing over the image scanning surface of the document scanning glass 213. The incident light Li is irradiated from 211. At this time, the reflected light Lr reflected from the document G is received by the light irradiation from the light source 211a in the first scanning body 211 via the document reading glass 213. As a result, the image of the document G is read by the first scanning body 211. Specifically, the reflected light Lr (reading light) from one surface of the document G is reflected by the first mirror 211b as in the above-mentioned document fixing method, and then the optical path is converted by the second mirror 214a and the third mirror 214b. An image is formed on the light receiving surface 216a of the image sensor 216 via the condenser lens 215, and an image of one surface of the document G is read here and converted into electrical image data. After that, the document G that has passed through the document reading glass 213 is conveyed to the discharge roller 227 via the second transfer roller 225 and the third transfer roller 226. At this time, when reading the image of the other side (back surface) of the document G, the close contact type image sensor 229a in the back surface reading unit 229 reads the image of the other side of the document G. Then, the document G that has passed through the close contact type image sensor 229a is ejected toward the document ejection tray 228 by the ejection roller 227 and placed on the document ejection tray 228.

In FIGS. 2 and 3, reference numeral 201 indicates a housing in the image reading device 200, and reference numeral 341 indicates a constituent member of the housing 201.

[Foreign matter adhesion judgment configuration]
(First Embodiment)
4 to 12 are explanatory views for explaining a foreign matter adhesion determination configuration of the image reading device 200 according to the first embodiment.

FIG. 4 is an example of the foreign matter adhesion determination configuration of the image reading device 200 according to the first embodiment, and is a single unit provided with the first light reflectance read member 300a and the second light reflectance read member 300b. It is a schematic front view which shows typically the example which made the read | read component 300 a roller member 311. FIG. 5 shows an example in which the length of the first light reflectance read member 300a in the circumferential direction of the roller member 311 shown in FIG. 4 is larger than the length of the second light reflectance read member 300b in the circumferential direction. It is a schematic side view which shows. 4 (a) and 5 (a) show a state in which the first light reflectance read member 300a of the roller member 311 faces the portion T corresponding to the reading position S of the document reading glass 213. 4 (b) and 5 (b) show a state in which the second light reflectance read member 300b of the roller member 311 faces the portion T corresponding to the reading position S of the document reading glass 213. There is.

FIG. 6 is a schematic configuration diagram showing a system configuration for determining foreign matter adhesion by an example of a first driving device that rotationally drives the roller member 311 shown in FIG.

FIG. 7 is another example of the foreign matter adhesion determination configuration of the image reading device 200 according to the first embodiment, in which the first light reflectance read member 300a and the second light reflectance read member 300b are provided. It is a schematic front view which shows typically the example which made the single constituent member 300 to be read a belt member 312. FIG. 8 shows an example in which the length of the first light reflectance read member 300a in the circumferential direction of the belt member 312 shown in FIG. 7 is larger than the length of the second light reflectance read member 300b in the circumferential direction. It is a schematic side view which shows. 7 (a) and 8 (a) show a state in which the first light reflectance read member 300a of the belt member 312 faces the portion T corresponding to the reading position S of the document reading glass 213. 7 (b) and 8 (b) show a state in which the second light reflectance read member 300b of the belt member 312 faces the portion T corresponding to the reading position S of the document reading glass 213. There is.

FIG. 9 is a schematic configuration diagram showing a system configuration for determining foreign matter adhesion by an example of a second driving device that rotationally drives the belt member 312 shown in FIGS. 7 and 8.

FIG. 10 is still another example of the foreign matter adhesion determination configuration of the image reading device 200 according to the first embodiment, in which the first light reflectance read member 300a and the second light reflectance read member 300b are provided. It is the schematic front view which shows typically the example which made the single read constituent member 300 as a guide member 321. FIG. 10A shows a state in which the first light reflectance read member 300a of the guide member 321 faces the portion T corresponding to the reading position S of the document reading glass 213, and FIG. 10B is shown in FIG. Indicates a state in which the second light reflectance read member 300b of the guide member 321 faces the portion T corresponding to the reading position S of the document reading glass 213.

11 and 12 are schematic configuration diagrams showing a system configuration for determining foreign matter adhesion according to an example of a third driving device that reciprocally drives the guide member 321 shown in FIG. 10 and another example, respectively.

It should be noted that FIGS. 11 and 12 show a state in which the first light reflectance read member 300a faces the portion T corresponding to the reading position S on the document reading glass 213.

The image reading device 200 controls the control unit 250 (see FIGS. 6, 9, 11, and 12) that controls the entire image reading device 200 under the instruction of the main control unit (not shown) in the image forming device 100. Further prepared.

In the present embodiment, the location T (FIG. 4, FIG. 5, FIG. 7, FIG. 4) corresponding to the reading position S of the document reading glass 213 (see FIGS. 4, 5, 7, 8, 10 to 12) 8. The foreign matter adhesion determination for determining whether or not foreign matter E (see FIGS. 4, 5, 7, 8, 10 to 10) is attached to (see FIGS. 10 to 12) is an image reading device. This is performed by the control unit 250 in 200. The foreign matter adhesion determination may be performed by the main control unit of the image forming apparatus 100, which is not shown. This also applies to the second embodiment and the third embodiment, which will be described later.

The control unit 250 includes a processing unit 251 (see FIGS. 6, 9, 11, and 12) composed of a microcomputer such as a CPU (Central Processing Unit), a non-volatile memory such as a ROM (Read Only Memory), and a RAM (RAM (see FIG. 6, FIG. 9, FIG. It has a storage unit 252 (see FIGS. 6, 9, 11, and 12) including a volatile memory such as Random Access Memory). The control unit 250 controls the operation of various components by the processing unit 251 loading the control program stored in the ROM of the storage unit 252 in advance into the RAM of the storage unit 252 and executing the control program. .. The RAM of the storage unit 252 provides the processing unit 251 with a work area for work and an area as an image memory for storing image data, respectively.

The image reading device 200 includes a first light reflectance read member 300a (see FIGS. 4 to 12) and a second light reflectance read member 300b having a light reflectance smaller than that of the first light reflectance read member 300a. (See FIGS. 4 to 12). In this example, the image reader 200 has a predetermined first light reflectance (for example, about 80% to 100%) of a predetermined reference light reflectance (for example, 80%) or more (for example, white). 1st light reflectance (for example, a black) second light having a predetermined second light reflectance (for example, about 0% to 10%) smaller than the first light reflectance and a member to be read 300a. It is provided with a reflectance read member 300b. Here, about 80% to 100% can be exemplified as the white first light reflectance of the first light reflectance read member 300a, and as the black second light reflectance of the second light reflectance read member 300b. , 0% to 10% can be exemplified. The second light reflectance of the member 300b to be read may be a light reflectance larger than 10% and smaller than 80%.

Then, the control unit 250 sees the first foreign matter adhesion determining means Q1 (see FIGS. 6, 9, 11, and 12) and the second foreign matter adhesion determining means Q2 (see FIGS. 6, 9, 11, and 12). ) And.

The first foreign matter adhesion determining means Q1 is the reflected light Lr from the first light reflectance read member 300a via the document reading glass 213 (see FIGS. 4, 5, 7, 8, 10 to 12). Is read by the first scanning body 211, and based on the first read data DT1 (see FIGS. 6, 9, 11, and 12), the foreign matter E is located at the portion T corresponding to the reading position S of the document reading glass 213. (Specifically, whether the value of the first read data DT1 is greater than or less than a predetermined first threshold value, or whether or not it is greater than or equal to or less than the first threshold value) is determined.

The second foreign matter adhesion determining means Q2 reads the reflected light Lr from the second light reflectance read member 300b through the document reading glass 213 by the first scanning body 211, and reads the second reading data DT2 (FIG. 6). , FIG. 9, FIG. 11, and FIG. 12), and whether or not foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213 (specifically, the value of the second reading data DT2 is Whether it is greater than or less than a predetermined second threshold, or greater than or equal to or less than the second threshold) is determined.

[About the first embodiment]
According to the first embodiment, the first light reflectance subject whose light reflectance is larger than the light reflectance of the second light reflectance read member 300b via the document reading glass 213 by the first foreign matter adhesion determining means Q1. From the reading member 300a [the first light reflectance read member 300a having a first light reflectance (for example, a light reflectance of about 80% to 100% of white or substantially white) equal to or higher than the reference light reflectance in this example]. The reflected light Lr is read by the first scanning body 211, and based on the read first reading data DT1, it is determined whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213. Therefore, at the portion T corresponding to the reading position S of the document reading glass 213, the first foreign matter Ea whose brightness is equal to or less than the predetermined brightness or smaller than the predetermined brightness (for example, a dark color or a predetermined density of a ball pen, a magic pen, etc. Second light reflection when ink with a darker color than the density or black foreign matter with a darker color such as black than the predetermined density or paper dust with a darker than the predetermined density is attached. Rate The first light reflectance of the member 300a to be read, which has a light reflectance larger than the light reflectance of the member 300b to be read [first light reflectance (for example, a light reflectance of about 80% to 100% of white or substantially white)]. Since the difference between the value of the read data of the reflected light Lr from and the value of the read data of the reflected light Lr from the first foreign matter Ea (black foreign matter) is large, the first foreign matter Ea is determined to be a foreign matter. Easy to do. Therefore, the first foreign matter Ea (black foreign matter) can be reliably determined to be a foreign matter.

On the other hand, by the second foreign matter adhesion determining means Q2, the light reflectance [second light reflectance (for example, light reflectance of about 0% to 10% of black or substantially black)] is set to the first light through the document reading glass 213. Reflectance Second light reflectance smaller than the light reflectance (first light reflectance) of the member 300a to be read The second read data DT2 read by reading the reflected light Lr from the member 300b to be read by the first scanning body 211. Based on the above, it is determined whether or not foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213. Therefore, the second foreign matter Eb (for example, the density of the sticker or the like is lighter than the predetermined density or less than or equal to the predetermined density) at the portion T corresponding to the reading position S of the document reading glass 213 and the lightness is larger than the predetermined brightness or higher than the predetermined brightness. If there is light-colored glue or white foreign matter such as paper dust with a lighter color than the specified density or lighter-colored paper dust with a density of white or less), the first light reflectance is applied. Light reflectance smaller than the light reflectance of the reading member 300a [second light reflectance (for example, light reflectance of about 0% to 10% of black or substantially black)] from the second light reflectance member 300b Since the difference between the value of the read data of the reflected light Lr and the value of the read data of the reflected light Lr from the second foreign matter Eb (white foreign matter) is large, it is easy to determine that the second foreign matter Eb is a foreign matter. .. Therefore, it can be reliably determined that the second foreign matter Eb (white foreign matter) is a foreign matter.

Then, the first foreign matter adhesion determining means Q1 determines whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213, and the second foreign matter adhesion determining means Q2 determines whether or not the foreign matter E is attached to the document reading glass. Since it is determined whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the 213, it is determined whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213. The control configuration for this can be simplified.

Thus, with a simple control configuration, it is possible to determine whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213 regardless of the brightness of the foreign matter E.

As the first light reflectance read member 300a, a white or substantially white read member can be typically exemplified. Further, the first light reflectance read member 300a may be an achromatic color read member such as gray or a chromatic color read member such as yellow or green. This also applies to the second embodiment and the third embodiment, which will be described later.

Further, the second light reflectance read member 300b has a light reflectance (second light reflectance) smaller than the light reflectance (first light reflectance) of the first light reflectance read member 300a. Any reading member may be used, and examples thereof include an achromatic member to be read such as black or substantially black or gray, or a member to be read having a chromatic color such as brown or blue. This also applies to the second embodiment described later.

In the first embodiment, the image reading device 200 is a single component to be read 300 provided with a first light reflectance read member 300a and a second light reflectance read member 300b [specifically, a roller member]. 311 (see FIGS. 4 to 6), belt member 312 (see FIGS. 7 to 9), and guide member 321 (see FIGS. 10 to 12)] are further provided.

By doing so, the number of members provided with the first light reflectance read member 300a and the second light reflectance read member 300b can be minimized, thereby simplifying the device configuration of the image reading device 200. Can be realized.

In this example, the first light reflectance read member 300a and the second light reflectance read member 300b are provided over the entire thickness direction of the single constituent member 300 to be read. However, the present invention is not limited to this, and the single constituent member 300 to be read may be provided at least on the outer surface in the thickness direction.

Here, an embodiment in which the single component 300 to be read is a rotating member 310 arranged so as to face the document reading glass 213 can be exemplified.

The first light reflectance read member 300a is provided in the first region 3111 (see FIGS. 4, 5, 7, 8, and 10) in the circumferential direction of the rotating member 310. The second light reflectance read member 300b is provided in a second region 3112 (see FIGS. 4, 5, 7, 8, and 10) other than the first region 3111 in the circumferential direction of the rotating member 310. ..

As the rotating member 310, typically, the roller member 311 (first embodiment-1) and the belt member 312 (first embodiment-2) can be exemplified.

(First Embodiment-1)
In the first embodiment-1 shown in FIGS. 4 to 6, the rotating member 310 is a roller member 311.

The first region 3111 (see FIGS. 4 and 5) is provided in a part of the roller member 311 in the circumferential direction. The first light reflectance read member 300a is provided in at least a part (overall in this example) of the first region 3111. The second region 3112 (see FIGS. 4 and 5) is provided in a portion other than the first region 3111 in the circumferential direction of the roller member 311. The second light reflectance read member 300b is provided (overall in this example) in at least a part of the second region 3112.

The roller member 311 is a first rotation position in which the first scanning body 211 reads the reflected light Lr from the first light reflectance read member 300a on the roller member 311 via the document reading glass 213 in the first foreign matter adhesion determining means Q1. In R1 [see FIGS. 4A and 5A] and in the second foreign matter adhesion determining means Q2, the first scanning body 211 is passed through the document reading glass 213 and the second light reflectance read member in the roller member 311. It is selectively rotatable between the second rotation position R2 [see FIGS. 4 (b) and 5 (b)] for reading the reflected light Lr from 300b.

Specifically, the image reading device 200 further includes a first driving device 410 (see FIG. 6) that rotationally drives the roller member 311.

The first drive device 410 includes a drive unit 411 (motor in this example) (see FIG. 6), a drive transmission mechanism 412 (see FIG. 6) that transmits the rotational driving force from the drive unit 411 to the roller member 311 and a roller. It is equipped with a detection device 413 (see FIG. 6) that detects the rotational position of the member 311.

In the drive unit 411, the rotation shaft 411a is rotatably fixed to the main body frame (not shown) of the image reading device 200 in parallel or substantially parallel to the rotation shaft 311a of the roller member 311. In this example, the drive unit 411 is a stepping motor that is driven by inputting a drive pulse signal.

The drive transmission mechanism 412 is a gear train in this example, and includes a first gear 412a and a second gear 412b. The first gear 412a is fixed to the rotating shaft 411a of the drive unit 411. The roller member 311 is rotatably supported by a main body frame (not shown) of the image reading device 200 along the main scanning direction X. The second gear 412b meshes with the first gear 412a and is fixed to the rotating shaft 311a of the roller member 311.

As a result, the first drive device 410 transmits the rotational driving force in one direction B1 and the other direction B2 from the drive unit 411 to the roller member 311 via the first gear 412a and the second gear 412b to transmit the roller member 311 to the roller member 311. It can be rotated in the other direction B2 and one direction B1.

The detection device 413 includes a detected piece 413a provided on any member (rotating shaft 311a of the roller member 311 in this example) rotated by the drive unit 411, and a detection unit 413b (this example) that detects the detected piece 413a. Is equipped with a light transmission type photo sensor).

The image sensor 216 is electrically connected to the input system of the control unit 250. The detection unit 413b is electrically connected to the input system of the control unit 250. The drive unit 411 is electrically connected to the output system of the control unit 250.

The control unit 250 controls the rotational position of the roller member 311 based on the detection signal from the detection unit 413b.

Specifically, the storage unit 252 has the circumference from the reference detection position to the first rotation position R1 with reference to the reference detection position (home position) of the detected piece 413a when the detection unit 413b detects the detected piece 413a. The first distance in the direction (first rotation angle, the number of first pulses of the drive pulse signal to the drive unit 411 in this example) and the second distance in the circumferential direction from the reference detection position to the second rotation position R2 (second). Rotation angle, the second pulse number of the drive pulse signal to the drive unit 411 in this example) and the relative distance (relative rotation angle, in this example) between the first rotation position R1 and the second rotation position R2 in the circumferential direction. The number of relative pulses of the drive pulse signal to the drive unit 411) is stored in advance.

When the control unit 250 moves the roller member 311 from the reference detection position (home position) where the detection piece 413a is detected by the detection unit 413b to the first rotation position R1, the control unit 250 stores the roller member 311 in the storage unit 252 from the reference detection position. The drive unit 411 is rotated by the first distance (the number of first pulses in this example). As a result, the control unit 250 can rotate the roller member 311 from the reference detection position and position it at the first rotation position R1.

On the other hand, when the control unit 250 moves the roller member 311 from the reference detection position (home position) where the detection piece 413a is detected by the detection unit 413b to the second rotation position R2, the control unit 250 moves from the reference detection position to the storage unit 252. The drive unit 411 is rotated by the stored second distance (the number of second pulses in this example). As a result, the control unit 250 can rotate the roller member 311 from the reference detection position and position it at the second rotation position R2.

Further, the display device 231 in the operation unit 230 is electrically connected to the output system of the control unit 250.

(First Embodiment-2)
In the first embodiment-2 shown in FIGS. 7 to 9, the rotating member 310 is a belt member 312.

The first region 3121 (see FIGS. 7 and 8) is provided on a part of the belt members 312 wound around the pair of belt roller members 313 and 314 facing each other at intervals in the circumferential direction. The first light reflectance read member 300a is provided (in this example as a whole) in at least a part of the first region 3121. The second region 3122 (see FIGS. 7 and 8) is provided in a portion other than the first region 3121 in the circumferential direction of the belt member 312. The second light reflectance read member 300b is provided (overall in this example) in at least a part of the second region 3122.

The belt member 312 has a first rotation position in which the first scanning body 211 reads the reflected light Lr from the first light reflectance read member 300a on the belt member 312 via the document reading glass 213 in the first foreign matter adhesion determining means Q1. In R1 [see FIGS. 7 (a) and 8 (a)] and in the second foreign matter adhesion determining means Q2, the first scanning body 211 passes through the document reading glass 213 and the second light reflectance read member in the belt member 312. It is selectively rotatable between the second rotation position R2 [see FIGS. 7 (b) and 8 (b)] for reading the reflected light Lr from 300b.

More specifically, the image reading device 200 further includes a pair of belt roller members 313 and 314 around which the belt member 312 is wound, and a second driving device 420 (see FIG. 9) that rotationally drives the belt member 312.

The pair of belt roller members 313 and 314 are rotatably supported by a main body frame (not shown) of the image reader 200 along the main scanning direction X.

The second drive device 420 applies the rotational driving force from the drive unit 421 (motor in this example) (see FIG. 9) to the belt roller member 313 on the drive side of the pair of belt roller members 313 and 314. It includes a drive transmission mechanism 422 (see FIG. 9) for transmission and a detection device 423 (see FIG. 9) for detecting the rotational position of the belt member 312.

The drive unit 421 is rotatably fixed to the main body frame (not shown) of the image reading device 200 in which the rotation shaft 421a is rotatably or substantially parallel to the rotation shafts 313a and 314a of the pair of belt roller members 313 and 314. In this example, the drive unit 421 is a stepping motor that is driven by inputting a drive pulse signal.

The drive transmission mechanism 422 is a gear train in this example, and includes a first gear 422a and a second gear 422b. The first gear 422a is fixed to the rotating shaft 421a of the drive unit 421. The pair of belt roller members 313 and 314 are rotatably supported by a main body frame (not shown) of the image reading device 200. The second gear 422b meshes with the first gear 422a and is fixed to the rotating shaft 313a of the belt roller member 313 on the drive side.

As a result, the second drive device 420 transmits the rotational driving force in one direction B1 and the other direction B2 from the drive unit 421 to the belt roller member 313 on the drive side via the first gear 422a and the second gear 422b. The belt roller members 313 and 314 can be rotated in the other direction B2 and the one direction B1.

The detection device 423 is a detection unit that detects a detected piece 423a and a detected piece 423a provided on any member (in this example, the rotating shaft 313a of the belt roller member 313 on the driving side) that is rotated by the driving unit 421. It is equipped with 423b (a light-transmitting photosensor in this example).

The detection unit 423b is electrically connected to the input system of the control unit 250. The drive unit 421 is electrically connected to the output system of the control unit 250.

The control unit 250 controls the rotational position of the belt member 312 based on the detection signal from the detection unit 423b.

Specifically, the storage unit 252 has the circumference from the reference detection position to the first rotation position R1 with reference to the reference detection position (home position) of the detected piece 423a when the detection unit 423b detects the detected piece 423a. The first distance in the direction (first rotation angle, the number of first pulses of the drive pulse signal to the drive unit 421 in this example) and the second distance in the circumferential direction from the reference detection position to the second rotation position R2 (second). Rotation angle, the second pulse number of the drive pulse signal to the drive unit 421 in this example) and the relative distance (relative rotation angle, in this example) between the first rotation position R1 and the second rotation position R2 in the circumferential direction. The number of relative pulses of the drive pulse signal to the drive unit 421) is stored in advance.

When the control unit 250 moves the belt member 312 from the reference detection position (home position) where the detection piece 423a is detected by the detection unit 423b to the first rotation position R1, the control unit 250 is stored in the storage unit 252 from the reference detection position. The drive unit 421 is rotated by the first distance (the number of first pulses in this example). As a result, the control unit 250 can rotate the belt member 312 from the reference detection position and position it at the first rotation position R1.

On the other hand, when the control unit 250 moves the belt member 312 from the reference detection position (home position) where the detection piece 423a is detected by the detection unit 423b to the second rotation position R2, the control unit 250 moves from the reference detection position to the storage unit 252. The drive unit 421 is rotated by the stored second distance (the number of second pulses in this example). As a result, the control unit 250 can rotate the belt member 312 from the reference detection position and position it at the second rotation position R2.

(1st Embodiment-1 and 1st embodiment-2)
In the first embodiment-1 and the first embodiment-2, the first scanning body 211 reads the reflected light Lr from the first light reflectance read member 300a via the document reading glass 213, and the document is read. A configuration in which the first scanning body 211 reads the reflected light Lr from the second light reflectance read member 300b via the glass 213 is such that the rotating member 310 (roller member 311 and belt member 312 in this example) is rotated. It can be realized with a simple configuration.

In the first embodiment-1 and the first embodiment-2, the control unit 250 places the rotating member 310 (roller member 311 and belt member 312 in this example) between the first rotating position R1 and the second rotating position R2. When moving with, the drive units 411 and 421 are rotated as follows. That is, the control unit 250 is positioned from the first rotation position R1 to the second rotation position R2 when the rotation member 310 (roller member 311 and belt member 312 in this example) is located at the first rotation position R1. The drive units 411 and 421 are rotated in a predetermined direction by the relative distance (the number of relative pulses in this example) stored in the storage unit 252. On the other hand, the control unit 250 is positioned from the second rotation position R2 to the first rotation position R1 when the rotation member 310 (roller member 311 and belt member 312 in this example) is located at the second rotation position R2. The drive units 411 and 421 are rotated in the direction opposite to the predetermined direction by the relative distance (the number of relative pulses in this example) stored in the storage unit 252. Here, when the first rotation position R1 and the second rotation position R2 are located at positions 180 degrees apart from each other, the control unit 250 determines the first foreign matter adhesion determination means Q1 and the second foreign matter adhesion determination means. When switching the execution between Q2, the drive units 411 and 421 move the rotating member 310 (roller member 311 and belt member 312 in this example) between the first rotation position R1 and the second rotation position R2. It may be rotated.

By the way, when the first rotation position R1 and the second rotation position R2 are provided at positions 180 degrees apart from each other, the execution is switched between the first foreign matter adhesion determining means Q1 and the second foreign matter adhesion determining means Q2. Occasionally, it is necessary to rotate the rotating member 310 (roller member 311 and belt member 312 in this example) by 180 degrees, and then the execution between the first foreign matter adhesion determining means Q1 and the second foreign matter adhesion determining means Q2. It takes time to switch.

On the other hand, in the first embodiment-1 and the first embodiment-2, when the first rotation position R1 and the second rotation position R2 are provided at positions other than 180 degrees apart from each other ( (See FIGS. 5 and 8), when the control unit 250 switches execution between the first foreign matter adhesion determining means Q1 and the second foreign matter adhesion determining means Q2, the drive units 411 and 421 rotate the member 310 (this example). The roller member 311 and the belt member 312) are rotated so that the distance between the first rotation position R1 and the second rotation position R2 in the circumferential direction is shorter.

By doing so, when the execution is switched between the first foreign matter adhesion determining means Q1 and the second foreign matter adhesion determining means Q2, the rotating member 310 (roller member 311 and belt member 312 in this example) is smaller than 180 degrees. Since it can be rotated by an angle, the time for switching the execution between the first foreign matter adhesion determining means Q1 and the second foreign matter adhesion determining means Q2 can be shortened accordingly.

By the way, since the light reflectance of the second light reflectance read member 300b is smaller than the light reflectance of the first light reflectance read member 300a (the first light reflectance of the first light reflectance read member 300a). Since it has a second light reflectance smaller than that of), there is no or little effect on the light reflectance due to dirt and the like. On the other hand, the first light reflectance read member 300a has a light reflectance larger than the light reflectance of the second light reflectance read member 300b (in this example, the first light reflectance equal to or higher than the reference light reflectance). Therefore, the light reflectance is likely to be partially lowered due to dirt or the like, and the determination accuracy of the foreign matter E (specifically, Ea) is deteriorated. Further, for example, when the shading correction is performed using the first light reflectance read member 300a, the correction accuracy of the shading correction deteriorates.

In this regard, in the first embodiment-1 and the first embodiment-2, the length of the first light reflectance read member 300a in the circumferential direction is larger than the length of the second light reflectance read member 300b in the circumferential direction. It is larger (see FIGS. 5 and 8).

By doing so, the light reflectance of the first light reflectance read member 300a, in which the length in the circumferential direction is larger than the length in the circumferential direction of the second light reflectance read member 300b, is lowered due to dirt or the like. The part that is not set can be positioned in a wide range as the first rotation position R1 (set position) where the setting can be changed, so that the light reflectance does not decrease due to dirt on the first light reflectance read member 300a or the like. The part can be widely used. Therefore, the determination accuracy of the foreign matter E (specifically, Ea) can be maintained for a long period of time. Further, for example, when the shading correction is performed using the first light reflectance read member 300a, the correction accuracy of the shading correction can be maintained for a long period of time.

Here, the shading correction is a correction for eliminating or substantially eliminating unevenness in the amount of incident light Li from the light source 211a and unevenness in sensitivity (unevenness in light receiving sensitivity) between each light receiving element in the image sensor 216. Based on the reference reading data obtained by irradiating a white or substantially white member to be read (specifically, a shading correction plate) with light from the light source 211a, the output values of the pixels from each light receiving element are uniform or substantially uniform. The correction in which the output value of each pixel is adjusted in advance so as to have an appropriate value can be mentioned.

By the way, since the light reflectance of the second light reflectance read member 300b is smaller than the light reflectance of the first light reflectance read member 300a (the first light reflectance of the first light reflectance read member 300a). When the rotating member 310 (in this example, the roller member 311 and the belt member 312) is located at the second rotating position R2 (because it has a second light reflectance smaller than that of the second scanning body 211), the first scanning body 211 When the image (specifically, the image of the original G) is read, the second light reflectance read member 300b is likely to show through. This is particularly noticeable when reading an image of a relatively thin document G.

In this regard, in the first embodiment-1 and the first embodiment-2, the control unit 250 reads an image (specifically, an image of the document G) by the first scanning body 211 via the document reading glass 213. Prior, the rotating member 310 (roller member 311 and belt member 312 in this example) is positioned at the first rotating position R1.

By doing so, the first light reflectance read member 300a has a light reflectance larger than the light reflectance of the second light reflectance read member 300b (in this example, the first light reflectance equal to or higher than the reference light reflectance). ), Therefore, when the image (specifically, the image of the original G) is read by the first scanning body 211, the first light reflectance read member 300a is difficult or not to show through. This is particularly effective when reading an image of a relatively thin document G.

The single member to be read 300 may be a long member 320 (see FIGS. 10 to 12) extending along the image reading surface of the document reading glass 213, in addition to the rotating member 310 as described above. .. As the long member 320, a guide member 321 (first embodiment-3) (specifically, a document guide member) can be typically exemplified.

(First Embodiment-3)
In the first embodiment-3 shown in FIGS. 10 to 12, the long member 320 is a guide member 321.

The guide member 321 is arranged so as to face the document reading glass 213. In this example, the guide member 321 forms a transport path for the document G with the document reading glass 213. That is, the guide member 321 constitutes a document guide plate that guides the document G transported in the transport direction C.

The first light reflectance read member 300a is placed in the first region 3211 (see FIG. 10) on one side in the longitudinal direction (specifically, the reciprocating movement direction) of the guide member 321 [for details, at least one of the first regions 3211. It is provided in the section (overall in this example). The second light reflectance read member 300b is placed in the second region 3212 (see FIG. 10) on the other side in the longitudinal direction (specifically, the reciprocating movement direction) of the guide member 321 [for details, at least one of the second regions 3212]. It is provided in the section (overall in this example).

In either one of the guide member 321 and the first scanning body 211 and the document reading glass 213 (guide member 321 in this example), the first scanning body 211 is the document reading glass 213 in the first foreign matter adhesion determining means Q1. The first moving position M1 [see FIG. 10A] for reading the reflected light Lr from the first light reflectance read member 300a of the guide member 321 and the first scanning body in the second foreign matter adhesion determining means Q2. The 211 selectively reciprocates from the second moving position M2 [see FIG. 10B] for reading the reflected light Lr from the second light reflectance read member 300b in the guide member 321 via the document reading glass 213. It is said to be movable.

By doing so, the first light reflectance Lr from the member 300a to be read is read by the first scanning body 211 through the document reading glass 213, and the second light reflectance is read through the document reading glass 213. A configuration in which the first scanning body 211 reads the reflected light Lr from the member to be read 300b can be realized by a simple configuration in which the long member 320 (guide member 321 in this example) is reciprocated.

Specifically, the image reading device 200 further includes a third driving device 430 (see FIG. 11) and a third driving device 440 (see FIG. 12) that reciprocally drive the guide member 321, respectively.

The guide member 321 is reciprocally supported by a main body frame (not shown) of the image reading device 200 along the sub-scanning direction Y.

-An example of the third drive device-
The third drive device 430 shown in FIG. 11 determines the moving positions of the drive unit 431 (motor in this example), the drive transmission mechanism 432 that transmits the rotational driving force from the drive unit 431 to the guide member 321 and the guide member 321. It is equipped with a detection device 433 for detecting.

In the drive unit 431, the rotation shaft 431a is rotatably fixed to the main body frame (not shown) of the image reader 200 in parallel or substantially parallel to the main scanning direction X. In this example, the drive unit 431 is a stepping motor that is driven by inputting a drive pulse signal.

In this example, the drive transmission mechanism 432 converts the rotary motion into a linear motion, and includes a pinion gear 432a and a rack gear 432b. The pinion gear 432a is fixed to the rotating shaft 431a of the drive unit 431. The rack gear 432b meshes with the pinion gear 432a and is arranged so as to be reciprocally movable in the main scanning direction X with respect to the main body frame (not shown) of the image reading device 200. Further, the rack gear 432b supports the guide member 321 by the support member 432c.

As a result, the third drive device 430 transmits the rotational driving force in one direction B1 and the other direction B2 from the drive unit 431 to the guide member 321 via the pinion gear 432a and the rack gear 432b, and transmits the guide member 321 in the sub-scanning direction. It can be reciprocated to one side Y1 and the other side Y2 in Y.

The detection device 433 includes a detected piece 433a provided on any member (rotating shaft 431a of the drive unit 431 in this example) rotated by the drive unit 431, and a detection unit 433b (this example) that detects the detected piece 433a. Is equipped with a light transmission type photo sensor).

The detection unit 433b is electrically connected to the input system of the control unit 250. The drive unit 431 is electrically connected to the output system of the control unit 250.

The control unit 250 controls the moving position of the guide member 321 based on the detection signal from the detection unit 433b.

Specifically, the storage unit 252 has a first position from the reference detection position to the first moving position M1 with reference to the reference detection position (home position) of the detected piece 433a when the detection unit 433b detects the detected piece 433a. One distance (the number of first pulses of the drive pulse signal to the drive unit 431 in this example) and the second distance from the reference detection position to the second movement position M2 (in this example, the first drive pulse signal to the drive unit 431). The number of 2 pulses) and the relative distance between the first moving position M1 and the second moving position M2 (in this example, the relative number of pulses of the driving pulse signal to the driving unit 431) are stored in advance.

When the guide member 321 is positioned at the first moving position M1 from the reference detection position (home position) where the detection piece 433a is detected by the detection unit 433b, the control unit 250 stores the guide member 321 in the storage unit 252 from the reference detection position. The drive unit 431 is rotated by the first distance (the number of first pulses in this example). As a result, the control unit 250 can move the guide member 321 from the reference detection position and position it at the first movement position M1.

On the other hand, when the control unit 250 positions the guide member 321 from the reference detection position (home position) where the detection piece 433a is detected by the detection unit 433b to the second moving position M2, the control unit 250 moves from the reference detection position to the storage unit 252. The drive unit 431 is rotated by the stored second distance (the number of second pulses in this example). As a result, the control unit 250 can move the guide member 321 from the reference detection position and position it at the second movement position M2.

In the first embodiment-3, when the guide member 321 is moved between the first moving position M1 and the second moving position M2, the control unit 250 rotates the driving unit 431 as follows. That is, the control unit 250 is stored in the storage unit 252 so that when the guide member 321 is located at the first moving position M1, the guide member 321 is located at the second moving position M2 from the first moving position M1 (this relative distance (this). In the example, the drive unit 431 is rotated in a predetermined direction by the number of relative pulses). On the other hand, the control unit 250 is stored in the storage unit 252 so that when the guide member 321 is located at the second moving position M2, it is located at the first moving position M1 from the second moving position M2 (this relative distance (this). In the example, the drive unit 431 is rotated in the direction opposite to the predetermined direction by the number of relative pulses).

-Another example of the third drive device-
The third drive device 440 shown in FIG. 12 urges the drive unit 441 (plunger type solenoid device in this example), the connecting member 442 that connects the drive unit 441 and the guide member 321 and the guide member 321. It is provided with a solenoid member 443.

The drive unit 441 is fixed to the main body frame (not shown) of the image reading device 200 at one side Y1 or the other side Y2 (one side Y1 in this example) of the guide member 321 in the sub-scanning direction Y. The drive unit 441 reciprocates the movable portion 441a (plunger in this example) to one side Y1 or the other side Y2 in the sub-scanning direction Y, and the movable portion 441a is moved to one side Y1 or the other side Y2 in the sub-scanning direction Y (this). In the example, it has a drive unit main body 441b (in this example, a solenoid device main body) that is driven on one side Y1).

In the connecting member 442, one end portion 442a is connected to the guide member 321 (in this example, the end portion 321a of one side Y1 in the sub-scanning direction Y), and the other end portion 442b is connected to the movable portion 441a in the drive portion 441. ing.

The urging member 443 urges the guide member 321 to the side of one side Y1 and the other side Y2 in the sub-scanning direction Y that is opposite to the side that is moved by the drive unit 441. In this example, the urging member 443 is a coil spring, one end portion 443a is connected to the guide member 321 (in this example, the end portion 321b of the other side Y2 in the sub-scanning direction Y), and the other end portion 443b. Is fixed to the main body frame FL of the image reading device 200.

As a result, the third drive device 440 can reciprocate the guide member 321 to one side Y1 and the other side Y2 in the sub-scanning direction Y depending on the drive state and the non-drive state of the drive unit 441.

The drive unit 441 is electrically connected to the output system of the control unit 250.

The control unit 250 controls the moving position of the guide member 321 by driving the drive unit 441.

Specifically, the control unit 250 drives the drive unit 441 when the guide member 321 is positioned at the first moving position M1. As a result, the control unit 250 positions the guide member 321 at the first moving position M1 to the one side Y1 in the sub-scanning direction Y against the urging force of the urging member 443 to the other side Y2 in the sub-scanning direction Y. Can be made to.

On the other hand, when the guide member 321 is positioned at the second moving position M2, the control unit 250 releases the drive to the drive unit 441. As a result, the control unit 250 can position the guide member 321 at the second moving position M2 of the urging member 443 to the other side Y2 in the sub-scanning direction Y by the urging force on the other side Y2 in the sub-scanning direction Y. it can.

The third drive device 440 may be configured such that the first moving position M1 and the second moving position M2 are interchanged.

By the way, since the light reflectance of the second light reflectance read member 300b is smaller than the light reflectance of the first light reflectance read member 300a (the first light reflectance of the first light reflectance read member 300a). Either one of the long member 320 (guide member 321 in this example) and both the first scanning body 211 and the document reading glass 213 (because it has a second light reflectance smaller than that). Then, when the guide member 321) is located at the second moving position M2, when the image (specifically, the image of the document G) is read by the first scanning body 211, the second light reflectance read member 300b Is easy to show through. This is particularly noticeable when reading an image of a relatively thin document G.

In this regard, in the first embodiment-3, the control unit 250 and the guide member 321 before reading the image (specifically, the image of the document G) by the first scanning body 211 via the document reading glass 213. One of both the first scanning body 211 and the document reading glass 213 (guide member 321 in this example) is positioned at the first moving position M1.

By doing so, the first light reflectance read member 300a has a light reflectance larger than the light reflectance of the second light reflectance read member 300b (in this example, the first light reflectance equal to or higher than the reference light reflectance). ), Therefore, when the image (specifically, the image of the original G) is read by the first scanning body 211, the first light reflectance read member 300a is difficult or not to show through. This is particularly effective when reading an image of a relatively thin document G.

-When moving both the first scanning body and the original scanning glass-
When both the first scanning body 211 and the document reading glass 213 are selectively reciprocated between the first moving position M1 and the second moving position M2, the guides are used in the third drive devices 430 and 440. The document reading glass 213 can be reciprocated instead of the member 321. Then, in such a configuration, when both the first scanning body 211 and the document reading glass 213 are moved, the relative positional relationship between the first scanning body 211 and the document reading glass 213 is determined by moving the first scanning body 211 and the document reading glass 213. It can be moved while being maintained.

(Second Embodiment)
In the image reading device 200 according to the first embodiment described above, an example in which the reading component is a single reading component 300 is shown, but in the image reading device 200 according to the second embodiment, the reading configuration is shown. An example is shown in which the members are two constituent members to be read (first constituent member 330 to be read and second constituent member 340 to be read). In the image reading device 200 according to the second embodiment, substantially the same components as the image reading device 200 according to the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

13 and 14 are explanatory views for explaining the foreign matter adhesion determination configuration of the image reading device 200 according to the second embodiment.

FIG. 13 is an example of the foreign matter adhesion determination configuration of the image reading device 200 according to the second embodiment, and the first reading component 330 provided with the first light reflectance read member 300a is used as the guide member 331. It is a schematic front view schematically showing an example in which the second light reflectance read member 340 provided with the second light reflectance read member 300b is used as the member 341 of the housing 201 in the image reading device 200. FIG. 13 (a) shows a state in which the portion T corresponding to the reading position S in the document reading glass 213 faces the first light reflectance read member 300a in the guide member 331, and FIG. 13 (b) shows the state. Indicates a state in which the portion T corresponding to the reading position S on the document reading glass 213 faces the second light reflectance read member 300b in the constituent member 341 of the housing 201.

FIG. 14 is a schematic configuration diagram showing a system configuration for determining foreign matter adhesion by an example of a fourth driving device that reciprocally drives the document reading glass 213 shown in FIG.

Note that FIG. 14 shows a state in which the portion T corresponding to the reading position S on the document reading glass 213 faces the first light reflectance read member 300a.

In the second embodiment, the control unit 250 includes a first foreign matter adhesion determining means Q1 (see FIG. 14) and a second foreign matter adhesion determining means Q2 (see FIG. 14).

The first foreign matter adhesion determining means Q1 reads the reflected light Lr from the first light reflectance read member 300a through the document reading glass 213 by the first scanning body 211, and is based on the read first reading data DT1. Whether or not foreign matter E is attached to the portion T corresponding to the scanning position S of the document scanning glass 213 (specifically, whether the value of the first scanning data DT1 is greater than or less than a predetermined first threshold value, or the first It is determined whether it is above or below one threshold value (see FIG. 13A).

The second foreign matter adhesion determining means Q2 reads the reflected light Lr from the second light reflectance read member 300b through the document reading glass 213 by the back surface reading unit 229, and the document is based on the read second reading data DT2. Whether or not foreign matter E is attached to the portion T corresponding to the reading position of the reading glass 213 (specifically, whether the value of the second reading data DT2 is greater than or less than a predetermined second threshold value, or whether or not the second threshold value is present. Whether it is above or below) is determined (see FIG. 13 (b)).

[About the second embodiment]
According to the second embodiment, the first light reflectance subject whose light reflectance is larger than the light reflectance of the second light reflectance read member 300b via the document reading glass 213 by the first foreign matter adhesion determining means Q1. From the reading member 300a [the first light reflectance read member 300a having a first light reflectance (for example, a light reflectance of about 80% to 100% of white or substantially white) equal to or higher than the reference light reflectance in this example]. The reflected light Lr is read by the first scanning body 211, and based on the read first reading data DT1, it is determined whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213. Therefore, when the first foreign matter Ea (blackish foreign matter) whose brightness is less than or equal to the predetermined brightness or smaller than the predetermined brightness is attached to the portion T corresponding to the reading position S of the document reading glass 213, the second light is reflected. Rate The first light reflectance of the member 300a to be read, which has a light reflectance larger than the light reflectance of the member 300b to be read [first light reflectance (for example, light reflectance of about 80% to 100% of white or substantially white)]. Since the difference between the value of the read data of the reflected light Lr from and the value of the read data of the reflected light Lr from the first foreign matter Ea (black foreign matter) is large, the first foreign matter Ea is determined to be a foreign matter. Easy to do. Therefore, the first foreign matter Ea (black foreign matter) can be reliably determined to be a foreign matter.

On the other hand, by the second foreign matter adhesion determining means Q2, the light reflectance [second light reflectance (for example, light reflectance of about 0% to 10% of black or substantially black)] is set to the first light through the document reading glass 213. Reflectance Second light reflectance smaller than the light reflectance (first light reflectance) of the member 300a to be read The reflected light Lr from the member 300b to be read is read by the back surface reading unit 229, and the second read data DT2 is read. Based on this, it is determined whether or not foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213. Therefore, when the second foreign matter Eb (white foreign matter) having a brightness higher than or higher than the predetermined brightness is attached to the portion T corresponding to the reading position S of the document reading glass 213, the first light Reflectance A second light reflectance read member having a light reflectance [second light reflectance (for example, a light reflectance of about 0% to 10% of black or substantially black)] smaller than the light reflectance of the member to be read 300a. Since the difference between the value of the read data of the reflected light Lr from 300b and the value of the read data of the reflected light Lr from the second foreign matter Eb (white foreign matter) is large, the second foreign matter Eb is regarded as a foreign matter. Easy to distinguish. Therefore, it can be reliably determined that the second foreign matter Eb (white foreign matter) is a foreign matter.

Then, the first foreign matter adhesion determining means Q1 determines whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213, and the second foreign matter adhesion determining means Q2 determines whether or not the foreign matter E is attached to the document reading glass. Since it is determined whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the 213, it is determined whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213. The control configuration for this can be simplified.

Thus, with a simple control configuration, it is possible to determine whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213 regardless of the brightness of the foreign matter E.

In the second embodiment, the image reading device 200 includes the first reading component 330 (guide member 331 in this example) provided with the first light reflectance read member 300a, and the first reading component 330. Is a separate body and is provided with a second light reflectance read member 300b. A second component to be read 340 [in this example, a component 341 (specifically, a bottom plate) of the housing 201 in the image reading device 200]. And further equipped. In this example, the housing 201 is provided in the document transfer unit 220 of the image reading device 200. Further, the guide member 331 forms a transport path for the document G with the document reading glass 213. That is, the guide member 331 constitutes a document guide plate that guides the document G transported in the transport direction C. Further, the first light reflectance read member 300a and the second light reflectance read member 300b are provided over the entire thickness direction of the first read component 330 and the second read component 340, respectively. ing. However, the present invention is not limited to this, and the first constituent member 330 to be read and the second constituent member 340 to be read may be provided at least on the outer surface in the thickness direction.

The document reading glass 213 is the first movement in which the first scanning body 211 reads the reflected light Lr from the first light reflectance read member 300a on the guide member 331 via the document reading glass 213 in the first foreign matter adhesion determining means Q1. The housing is located at the same position as or substantially the same as the position M1 [see FIG. 13 (a)] and the position read by the back surface reading unit 229 by the first scanning body 211 of the document reading glass 213 in the second foreign matter adhesion determining means Q2. The second light reflectance of the constituent member 341 of 201 is movable back and forth with the second moving position M2 [see FIG. 13 (b)] for reading the reflected light Lr from the member to be read 300b.

By doing so, the first light reflectance Lr from the member to be read 300a is read by the first scanning body 211 through the document reading glass 213, and the second light reflectance is read through the document reading glass 213. A configuration in which the reflected light Lr from the member to be read 300b is read by the back surface reading unit 229 can be realized by a simple configuration such as reciprocating the document reading glass 213.

Here, the first component to be read 330 can be a guide member 331 (specifically, a document guide member), and the first light reflectance member 300a is the document reading glass 213 of the guide member 331. It can be provided on the opposite surface of the. The second component to be read 340 can be a component 341 (specifically, a bottom plate) at the bottom of the housing 201 of the image reading device 200, and the second light reflectance member to be read 300b is an image reading device. It can be provided on the constituent member 341 at the bottom of the housing 201 of 200.

Specifically, the image reading device 200 further includes a fourth driving device 450 (see FIG. 14) that reciprocally drives the document reading glass 213.

The document reading glass 213 is supported so as to be reciprocally movable along the main body frame (not shown) of the image reading device 200 along the sub-scanning direction Y.

The fourth drive device 450 can reciprocate the document reading glass 213 instead of the guide member 331 in the third drive devices 430 and 440 of the first embodiment-3 described above. Therefore, detailed description of the fourth drive device 450 will be omitted here.

(Third Embodiment)
In the image reading device 200 according to the first embodiment and the second embodiment described above, the members to be read are two members to be read, the first light reflectance read member 300a and the second light reflectance read member 300b. Although an example is shown, in the image reading device 200 according to the third embodiment, an example in which the member to be read is a single member to be read (in this example, the first member to be read with light reflectance 300a) is shown. In the image reading device 200 according to the third embodiment, substantially the same components as the image reading device 200 according to the first embodiment and the second embodiment are designated by the same reference numerals, and the description thereof will be omitted.

15 and 16 are explanatory views for explaining a foreign matter adhesion determination configuration of the image reading device 200 according to the third embodiment.

FIG. 15 is an example of the foreign matter adhesion determination configuration of the image reading device 200 according to the third embodiment, in which the reading component 350 provided with the first light reflectance read member 300a is used as the guide member 351. Is a schematic front view schematically showing. FIG. 15A shows a state in which the first light reflectance read member 300a of the guide member 351 faces the portion T corresponding to the reading position S of the document reading glass 213, and FIG. 15B is shown in FIG. Is a location T where the first light reflectance read member 300a of the guide member 351 is retracted from the optical path of the light (incident light Li) from the first scanning body 211 and corresponds to the reading position S of the document reading glass 213. It shows the open state.

FIG. 16 is a schematic configuration diagram showing a system configuration for determining foreign matter adhesion by an example of a fifth driving device that reciprocally drives the guide member 351 shown in FIG.

Note that FIG. 16 shows a state in which the first light reflectance read member 300a faces the portion T corresponding to the reading position S on the document reading glass 213.

In the third embodiment, the image reader 200 has a first displacement position N1 in which the amount of reflected light Lr read by the first scanning body 211 through the document reading glass 213 is equal to or greater than or greater than a predetermined predetermined amount of light. The first light that can be displaced between the second displacement positions N2 in which the amount of reflected light Lr read by the first scanning body 211 through the document reading glass 213 is less than or less than a predetermined amount of light. It is provided with a reflectance read member 300a. In this example, the first light reflectance read member 300a reflects a predetermined light reflectance (for example, about 80% to 100% of white or substantially white) equal to or higher than a predetermined reference light reflectance. Rate).

The control unit 250 includes a first foreign matter adhesion determining means Q1 (see FIG. 16) and a second foreign matter adhesion determining means Q2 (see FIG. 16).

The first foreign matter adhesion determining means Q1 receives the reflected light from the first light reflectance read member 300a via the document reading glass 213 in a state where the first light reflectance read member 300a is positioned at the first displacement position N1. Whether or not foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213 based on the first reading data DT1 read by reading Lr by the first scanning body 211 (specifically, the first 1 It is determined whether the value of the read data DT1 is greater than or less than a predetermined first threshold value, or greater than or equal to or less than the first threshold value) (see FIG. 15A).

The second foreign matter adhesion determining means Q2 receives the reflected light from the first light reflectance read member 300a via the document reading glass 213 in a state where the first light reflectance read member 300a is positioned at the second displacement position N2. Whether or not foreign matter E is attached to the portion T corresponding to the reading position S of the document scanning glass 213 based on the second scanning data DT2 read by reading Lr by the first scanning body 211 (specifically, the first 2 It is determined whether the value of the read data DT2 is greater than or less than a predetermined second threshold value, or greater than or equal to or less than the second threshold value) (see FIG. 15B).

Here, in the second foreign matter adhesion determining means Q2, from the first light reflectance read member 300a via the document reading glass 213 in a state where the first light reflectance read member 300a is positioned at the second displacement position N2. When the reflected light Lr is read by the first scanning body 211, the concept includes a case where the reflected light Lr from the first light reflectance read member 300a is not received by the first scanning body 211.

[About the third embodiment]
According to the third embodiment, the first light reflectance is transmitted through the document reading glass 213 in a state where the first light reflectance read member 300a is positioned at the first displacement position N1 by the first foreign matter adhesion determining means Q1. Whether the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213 based on the first scanning data DT1 read by reading the reflected light Lr from the member to be read 300a by the first scanning body 211. Judge whether or not. Therefore, when the first foreign matter Ea (blackish foreign matter) whose brightness is equal to or less than the predetermined brightness or smaller than the predetermined brightness is attached to the portion T corresponding to the reading position S of the document reading glass 213, the first displacement position. The value of the read data of the reflected light Lr from the first light reflectance read member 300a in the state of being positioned at N1 and the value of the read data of the reflected light Lr from the first foreign matter Ea (black foreign matter). Since the difference is large, it is easy to determine that the first foreign matter Ea is a foreign matter. Therefore, the first foreign matter Ea (black foreign matter) can be reliably determined to be a foreign matter.

On the other hand, from the first light reflectance read member 300a via the document reading glass 213 in a state where the first light reflectance read member 300a is positioned at the second displacement position N2 by the second foreign matter adhesion determining means Q2. The reflected light Lr is read by the first scanning body 211, and based on the read second reading data DT2, it is determined whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213. Therefore, if a second foreign matter Eb (white foreign matter) having a brightness higher than or higher than the predetermined brightness is attached to the portion T corresponding to the reading position S of the document reading glass 213, the second displacement The value of the read data of the reflected light Lr from the first light reflectance read member 300a in the state of being positioned at the position N2 and the value of the read data of the reflected light Lr from the second foreign matter Eb (white foreign matter). Since the difference between the two is large, it is easy to determine that the second foreign matter Eb is a foreign matter. Therefore, it can be reliably determined that the second foreign matter Eb (white foreign matter) is a foreign matter.

Then, the first foreign matter adhesion determining means Q1 determines whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213, and the second foreign matter adhesion determining means Q2 determines whether or not the foreign matter E is attached to the document reading glass. Since it is determined whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the 213, it is determined whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213. The control configuration for this can be simplified.

Thus, with a simple control configuration, it is possible to determine whether or not the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213 regardless of the brightness of the foreign matter E.

In the third embodiment, the image reading device 200 further includes a reading component 350 (guide member 351 in this example) provided with the first light reflectance read member 300a. In this example, the guide member 351 forms a transport path for the document G with the document reading glass 213. That is, the guide member 351 constitutes a document guide plate that guides the document G transported in the transport direction C. Further, the first light reflectance read member 300a is provided over the entire thickness direction of the read constituent member 350. However, the present invention is not limited to this, and it can be provided on at least the outer surface of the component to be read 350 in the thickness direction.

The first foreign matter adhesion determining means Q1 reads the reflected light Lr from the first light reflectance read member 300a through the document reading glass 213 by the first scanning body 211, and the guide member 351 is placed at the first displacement position N1. To be located in. Further, the second foreign matter adhesion determining means Q2 displaces the guide member 351 in the second when the first scanning body 211 reads the reflected light Lr from the first light reflectance read member 300a through the document reading glass 213. Positioned at position N2.

The guide member 351 is said to be displaceable between the first displacement position N1 and the second displacement position N2 (in this example, it can be reciprocated).

Specifically, the image reading device 200 further includes a fifth driving device 460 (see FIG. 16) that drives the guide member 351 by displacement (reciprocating movement driving in this example).

In the third embodiment, the first displacement position N1 is a position where the first light reflectance read member 300a faces the position T corresponding to the reading position S of the document reading glass 213.

The second displacement position N2 may be a position separated from the first displacement position N1 by a predetermined distance in the optical axis direction, or the first light reflectance read member 300a may be separated from the first displacement position N1 in the optical axis direction. May be moved to a position deviating from the optical axis by moving in an intersecting direction (for example, an orthogonal or substantially orthogonal direction). In this example, the second displacement position N2 is a position deviated from the optical axis by moving the first light reflectance read member 300a from the first displacement position N1 in a direction orthogonal to or substantially orthogonal to the optical axis direction. ing.

The fifth drive device 460 can reciprocate the guide member 351 as in the third drive devices 430 and 440 of the first embodiment-3 described above. Therefore, detailed description of the fifth drive device 460 will be omitted here.

(Common configuration of the first to third embodiments)
In the first to third embodiments, the control unit 250 performs shading correction after performing the first foreign matter adhesion determining means Q1 and the second foreign matter adhesion determining means Q2. The control unit 250 uses the first read data DT1 in the first foreign matter adhesion determining means Q1 for shading correction. Here, the white or substantially white read member for performing shading correction is the first light reflectance read member 300a in the first to third embodiments.

By doing so, the reading operation for shading correction can be omitted. Moreover, after determining that the black and / or white foreign matter E (first foreign matter Ea and / or second foreign matter Eb) is attached to the portion T corresponding to the reading position S of the document reading glass 213, the document By cleaning the reading glass 213 or the like, the black and / or white foreign matter E (first foreign matter Ea and / or second foreign matter Eb) should not be present at the portion T corresponding to the reading position S of the original reading glass 213. Therefore, the shading correction can be performed with high accuracy.

In the first to third embodiments, the image reading device 200 further includes a notification device [in this example, a display device 231 (see FIGS. 6, 9, 11, 12, 14, 14, and 16)]. ing. The notification device (display device 231 in this example) is electrically connected to the output system of the control unit 250.

In the control unit 250, foreign matter E (Ea, Eb) adheres to the portion T corresponding to the reading position S of the document reading glass 213 in at least one of the first foreign matter adhesion determining means Q1 and the second foreign matter adhesion determining means Q2. If it is determined to be present, the notification device (display device 231 in this example) issues an alarm prompting the user to clean the document reading glass 213 (in this example, a message is displayed, for example, "clean the document reading glass". Please display the message "Please.").

By doing so, it is possible to notify the operator such as the user that the foreign matter E is attached to the document reading glass 213, whereby the operator such as the user can be made to clean the document reading glass 213.

Here, as the notification device, in addition to the display device 231 that displays a message prompting the user to clean the document reading glass 213 (specifically, a message is displayed), an alarm sound prompting the user to clean the document reading glass 213 and an alarm sound. / Or an alarm device that emits a sound can be exemplified.

When the control unit 250 determines in the first foreign matter adhesion determining means Q1 that the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213, the control unit 250 is a notification device (display device in this example). In 231), it is notified that the first foreign matter Ea (black foreign matter) whose brightness is less than or equal to the predetermined brightness or smaller than the predetermined brightness may be attached to the portion T corresponding to the reading position S of the document reading glass 213. (In this example, the first message is displayed, for example, the message "Foreign matter such as black glue or paper dust may be attached." Is displayed). Further, when the control unit 250 determines in the second foreign matter adhesion determining means Q2 that the foreign matter E is attached to the portion T corresponding to the reading position S of the document reading glass 213, the control unit 250 is a notification device (in this example,). In the display device 231), there is a possibility that a second foreign matter Eb (white foreign matter) having a brightness higher than or higher than the predetermined brightness is attached to the portion T corresponding to the reading position S of the document reading glass 213. An alarm is issued to notify that (in this example, the second message is displayed, for example, the message "Foreign matter such as white glue or paper dust may be attached" is displayed).

By doing so, when the first foreign matter Ea (black foreign matter) is attached to the portion T corresponding to the reading position S of the document reading glass 213, the first foreign matter Ea is attached to the document reading glass 213. It is possible to notify an operator such as a user that there is a possibility. Further, when the second foreign matter Eb (white foreign matter) is attached to the portion T corresponding to the reading position S of the document reading glass 213, there is a possibility that the second foreign matter Eb is attached to the document reading glass 213. It is possible to notify an operator such as a user of the existence. As a result, it is possible to have an operator such as a user clean the foreign matter in a state where the type of foreign matter (for example, black foreign matter or white foreign matter) is recognized to some extent.

Here, as the notification device, in addition to the display device 231, the first foreign matter Ea (black foreign matter) and the second foreign matter Eb (white foreign matter) are placed at the portion T corresponding to the reading position S of the document reading glass 213. An example is an alarm device that emits an alarm sound and / or a sound indicating that at least one of them may be attached.

(Other embodiments)
In the first to third embodiments, in at least one of the first foreign matter adhesion determining means Q1 and the second foreign matter adhesion determining means Q2, the foreign matter E is located at the portion T corresponding to the reading position S of the document reading glass 213. When it is determined that (Ea, Eb) is attached, one of the first scanning body 211 and the document reading glass 213 is sub-scanned by a predetermined distance until the foreign matter E (Ea, Eb) is no longer determined. It may be moved in the direction Y.

Further, in the first to third embodiments, a cleaning device for cleaning at least the portion T of the document reading glass 213 corresponding to the reading position S is further provided, and the first foreign matter adhesion determining means Q1 and the second foreign matter adhesion determining means Q2 are further provided. If it is determined that foreign matter E (Ea, Eb) is attached to the portion T corresponding to the reading position S of the document reading glass 213 in at least one of them, the cleaning device determines that the reading position S of the document reading glass 213 is attached. The portion T corresponding to the above may be automatically cleaned.

(Processing example of the operation of the first to third embodiments)
Next, a processing example of the foreign matter adhesion determination operation by the control unit 250 of the image reading device 200 according to the first to third embodiments will be described below with reference to FIGS. 17 to 20.

-An example of processing for foreign matter adhesion judgment operation-
FIG. 17 is a flowchart showing an example of processing of the foreign matter adhesion determination operation of the image reading device 200 according to the first to third embodiments. FIG. 18 shows the value of the first reading data DT1 and the first threshold value of each pixel in the main scanning direction X in the processing of the first foreign matter adhesion determination operation in the image reading device 200 according to the first to third embodiments. It is a graph which shows α1. Further, FIG. 19 shows the value of the second reading data DT2 of each pixel in the main scanning direction X in the processing of the second foreign matter adhesion determination operation in the image reading device 200 according to the first to third embodiments, and the second reading data DT2. It is a graph which shows 2 threshold value α2.

As shown in FIG. 17, first, the control unit 250 waits until there is an image reading instruction which is an instruction to read the image of the document G (step S1: No), and when there is an image reading instruction (step S1: Yes). , Step S2a.

Next, the control unit 250 performs a first initial process for reading the first light reflectance read member 300a (step S2a).

Specifically, in the first initial processing of step S2a, in the first embodiment-1 and the first embodiment-2, the control unit 250 positions the roller member 311 and the belt member 312 at the first rotation position R1. In the first embodiment-3 and the second embodiment, the guide member 321 and the document reading glass 213 are positioned at the first moving position M1. Further, in the third embodiment, the guide member 351 is positioned at the first displacement position N1.

Next, in the process of the first foreign matter adhesion determination operation by the first foreign matter adhesion determination means Q1, the control unit 250 first transmits the reflected light Lr from the first light reflectance read member 300a via the document reading glass 213. The first scanning data DT1 is acquired by scanning with the scanning body 211 (step S3), and the foreign matter E adheres to the portion T corresponding to the scanning position S of the document scanning glass 213 based on the obtained first scanning data DT1. (Step S4).

Specifically, the control unit 250 determines when the first read data DT1 (for example, the value of a predetermined number of consecutive pixels among the pixels in the main scanning direction X) falls below a predetermined first threshold value α1 (see FIG. 18) or the first. When the threshold value is α1 or less, it is determined that the black foreign matter E (first foreign matter Ea) is attached to the portion T corresponding to the reading position S of the document reading glass 213 (step S4: Yes). Then, the control unit 250 notifies that the black foreign matter E (first foreign matter Ea) may be attached to the portion T corresponding to the reading position S of the document reading glass 213 in the display device 231. 1 The message is displayed together with the message prompting cleaning (step S5).

On the other hand, the control unit 250 corresponds to the reading position S of the document reading glass 213 when the first reading data DT1 (for example, the value of each pixel in the main scanning direction X) is equal to or higher than the first threshold value α1 or exceeds the first threshold value α1. It is determined that the black foreign matter E (first foreign matter Ea) is not attached to the portion T (step S4: No), and the process proceeds to step S6 as it is. At this time, the first read data DT1 is stored in the storage unit 252.

Next, the control unit 250 performs a first transition process for reading the second light reflectance read member 300b (step S6).

Specifically, in the transition process of step S6, in the first embodiment-1 and the first embodiment-2, the control unit 250 positions the roller member 311 and the belt member 312 at the second rotation position R2, and performs the first embodiment. In the third and second embodiments, the guide member 321 and the document reading glass 213 are positioned at the second moving position M2. Further, in the third embodiment, the guide member 351 is positioned at the second displacement position N2.

Next, in the process of the second foreign matter adhesion determination operation, the control unit 250, in the first embodiment and the third embodiment, receives the reflected light Lr from the second light reflectance read member 300b via the document reading glass 213. Is read by the first scanning body 211, and in the second embodiment, the reflected light Lr from the second light reflectance read member 300b is read by the back surface reading unit 229 via the document reading glass 213 and the second The scanning data DT2 is acquired (step S7), and based on the obtained second scanning data DT2, it is determined whether or not foreign matter E is attached to the portion T corresponding to the scanning position S of the document scanning glass 213 (step S7). S8).

Specifically, the control unit 250 determines when the second read data DT2 (for example, the value of a predetermined number of consecutive pixels among the pixels in the main scanning direction X) is equal to or higher than the predetermined second threshold value α2 (see FIG. 19) or the second. When the two threshold values α2 are exceeded, it is determined that the white foreign matter E (second foreign matter Eb) is attached to the portion T corresponding to the reading position S of the document reading glass 213 (step S8: Yes). Then, the control unit 250 notifies that the white foreign matter E (second foreign matter Eb) may be attached to the portion T corresponding to the reading position S of the document reading glass 213 in the display device 231. 2 The message is displayed together with the message prompting cleaning (step S9).

On the other hand, the control unit 250 corresponds to the reading position S of the document reading glass 213 when the second reading data DT2 (for example, the value of each pixel in the main scanning direction X) is lower than the second threshold value α2 or equal to or lower than the second threshold value α2. It is determined that the white foreign matter E (second foreign matter Eb) does not adhere to the portion T to be formed (step S8: No), and the process proceeds to step S10 as it is.

Here, the first threshold value α1 and the second threshold value α2 may be equal or different from each other. From the viewpoint of improving the determination sensitivity of the foreign matter E (Ea, Eb), it is preferable to make the first threshold value α1 larger than the second threshold value α2 as shown in FIGS. 18 and 19. In this example, the larger the amount of reflected light Lr (the amount of received light), the larger the values of the first read data DT1 and the second read data DT2 are illustrated. Therefore, when the values of the first read data DT1 and the second read data DT2 are made smaller as the amount of the reflected light Lr is larger, it goes without saying that the above-mentioned first threshold value α1 and second threshold value α2 The conditions and magnitude relationship are reversed. This also applies to other examples of the processing of the foreign matter adhesion determination operation described later.

Next, the control unit 250 performs shading correction using the first read data DT1 stored in the storage unit 252 when the determination in step S4 is “No” (step S10). By doing so, shading correction can be performed using the first read data DT1 in a state where the white foreign matter E (second foreign matter Eb) is not attached.

Next, the control unit 250 performs a second transition process for reading the first light reflectance read member 300a (step S11).

Specifically, in the second transition process of step S11, in the first embodiment-1 and the first embodiment-2, the control unit 250 moves the roller member 311 and the belt member 312 from the second rotation position R2 to the first rotation position. Returning to R1, in the first embodiment-3 and the second embodiment, the guide member 321 and the document reading glass 213 are returned from the second moving position M2 to the first moving position M1. Further, in the third embodiment, the guide member 351 is returned from the second displacement position N2 to the first displacement position N1.

Then, the control unit 250 performs an image reading process for reading the image of the document G (step S12), and ends the process.

-Another example of processing the foreign matter adhesion determination operation-
In the processing example shown in FIG. 17 described above, the processing of the second foreign matter adhesion determination operation is performed after the processing of the first foreign matter adhesion determination operation is performed, but the second foreign matter adhesion determination operation is performed after the processing of the second foreign matter adhesion determination operation. 1 The processing of the foreign matter adhesion determination operation may be performed.

FIG. 20 is a flowchart showing another example of the processing of the foreign matter adhesion determination operation of the image reading device 200 according to the first to third embodiments.

In the flowchart shown in FIG. 20, substantially the same processing as the flowchart shown in FIG. 17 is designated by the same reference numerals, and the points different from the processing of the flowchart shown in FIG. 17 will be mainly described.

As shown in FIG. 20, first, the control unit 250 waits until there is an image reading instruction which is an instruction to read the image of the document G (step S1: No), and when there is an image reading instruction (step S1b: Yes). , Step S2b.

Next, the control unit 250 performs a second initial process for reading the second light reflectance read member 300b (step S2b).

Specifically, in the second initial process of step S2b, in the first embodiment-1 and the first embodiment-2, the control unit 250 positions the roller member 311 and the belt member 312 at the second rotation position R2, and the second is In the first embodiment-3 and the second embodiment, the guide member 321 and the document reading glass 213 are positioned at the second moving position M2. Further, in the third embodiment, the guide member 351 is positioned at the second displacement position N2.

Next, the control unit 250 performs the processing of the second foreign matter determination operation in steps S7 to S9, and when the second read data DT2 (for example, the value of each pixel in the main scanning direction X) falls below the second threshold value α2, or When the second threshold value is α2 or less, it is determined that the white foreign matter E (second foreign matter Eb) does not adhere to the portion T corresponding to the reading position S of the document reading glass 213 (step S8: No), and in step S11. Transition.

Next, the control unit 250 performs the second transition process (step S11), performs the process of the first foreign matter determination operation of steps S3 to S5, and performs the first read data DT1 (for example, each pixel in the main scanning direction X). When the value) is equal to or higher than the first threshold value α1 or exceeds the first threshold value α1, it is determined that the black foreign matter E (first foreign matter Ea) does not adhere to the portion T corresponding to the reading position S of the document reading glass 213. (Step S4: No), shading correction is performed using the first read data DT1 acquired in step S3 (step S10).

In the processing example shown in FIG. 20 described above, shading correction is performed using the first read data DT1 in a state where both white and black foreign matter E (first foreign matter Ea and second foreign matter Eb) are not attached. It can be performed. Further, the first transition process of step S6 performed in the process example shown in FIG. 17 can be omitted, and the process time can be shortened accordingly.

The present invention is not limited to the embodiments described above, and can be implemented in various other forms. Therefore, such embodiments are merely exemplary in all respects and should not be construed in a limited way. The scope of the present invention is shown by the claims and is not bound by the text of the specification. Furthermore, all modifications and modifications that fall within the equivalent scope of the claims are within the scope of the present invention.

100 Image forming device 200 Image reading device 201 Housing 210 Image reading unit 211 First scanning body (example of reading unit)
213 Original reading glass (example of transparent material)
216 Image sensor 220 Document transfer unit 229 Back side reading unit (an example of sub-reading unit)
229a Close contact type image sensor 231 Display device 250 Control unit 300 Single component to be read 300a First light reflectance read member 300b Second light reflectance read member 310 Rotating member (Example of a single member to be read) )
311 Roller member (an example of rotating member)
3111 1st region 3112 2nd region 312 Belt member (another example of rotating member)
3121 1st region 3122 2nd region 320 Long member (another example of a single read component)
321 Guide member (an example of a long member)
3211 1st area 3212 2nd area 330 1st read component 331 guide member (example of 1st read component)
340 Second read component 341 Component member of the housing (an example of the second read component)
350 Constituent member to be read 351 Guide member (Example of constituent member to be read)
DT1 1st read data DT2 2nd read data E Foreign matter Ea 1st foreign matter (black foreign matter)
Eb 2nd foreign matter (white foreign matter)
G Manuscript M1 First movement position M2 Second movement position N1 First displacement position N2 Second displacement position Q1 First foreign matter adhesion determination means Q2 Second foreign matter adhesion determination means R1 First rotation position R2 Second rotation position S Reading position T Location X Main scanning direction Y Sub scanning direction α1 First threshold α2 Second threshold

Claims (10)

An image reading device including a transparent body and a reading unit that reads an image through the transparent body.
The first light reflectance read member and
The second light reflectance read member, which has a smaller light reflectance than the first light reflectance read member,
The light reflected from the member to be read with the first light reflectance is read through the transparent body by the reading unit, and foreign matter adheres to a portion corresponding to the reading position of the transparent body based on the read first read data. The first foreign matter adhesion determination means for determining whether or not this is done,
The light reflected from the member to be read with the second light reflectance is read by the reading unit through the transparent body, and foreign matter adheres to a portion corresponding to the reading position of the transparent body based on the read second reading data. A second foreign matter adhesion determining means for determining whether or not the image is being applied,
A single member to be read provided with the first light reflectance read member and the second light reflectance read member.
The single component to be read is a rotating member arranged so as to face the transparent body, and the first light reflectance read member is provided in a first region in the circumferential direction of the rotating member. The second light reflectance read member is provided in a second region other than the first region in the circumferential direction of the rotating member.
The rotating member includes a first rotating position in which the reading unit reads the reflected light from the first light reflectance read member of the rotating member through the transparent body in the first foreign matter adhesion determining means, and the first rotating member. (2) In the foreign matter adhesion determining means, the reading unit is selectively rotatable between the reading unit and the second rotation position for reading the reflected light from the second light reflectance read member of the rotating member via the transparent body. And
The rotating member is a belt member and
The reading unit is an image reading device characterized by reading a flat portion of the belt member. The image reading device according to claim 1.
An image reading device further comprising a pair of belt roller members around which the belt member is wound and a driving device for rotationally driving the belt member. The image reading device according to claim 1 or 2.
The first rotation position and the second rotation position are provided at positions other than positions 180 degrees apart from each other.
When the execution is switched between the first foreign matter adhesion determining means and the second foreign matter adhesion determining means, the distance between the first rotation position and the second rotation position of the rotating member in the circumferential direction is short. An image reader characterized by rotating in a direction. The image reading device according to any one of claims 1 to 3.
An image reading device characterized in that the length of the first light reflectance read member in the circumferential direction is larger than the length of the second light reflectance read member in the circumferential direction. The image reading device according to any one of claims 1 to 4.
An image reading device characterized in that the rotating member is positioned at the first rotation position before the image is read by the reading unit via the transparent body. An image reading device including a transparent body and a reading unit that reads an image through the transparent body.
A sub-reader that reads images and
The first light reflectance read member and
The second light reflectance read member, which has a smaller light reflectance than the first light reflectance read member,
The light reflected from the member to be read with the first light reflectance is read through the transparent body by the reading unit, and foreign matter adheres to a portion corresponding to the reading position of the transparent body based on the read first read data. The first foreign matter adhesion determination means for determining whether or not this is done,
The reflected light from the member to be read with the second light reflectance is read through the transparent body by the sub-reading unit, and a foreign substance is generated at a position corresponding to the reading position of the transparent body based on the read second reading data. A second foreign matter adhesion determining means for determining whether or not it is adhered,
The first component to be read provided with the first light reflectance member to be read, and the first component to be read.
It is provided with a second component to be read, which is separate from the first component to be read and is provided with the second light reflectance member to be read.
The transparent body is a first moving position in which the reading unit reads the reflected light from the first light reflectance reading member of the first component to be read through the transparent body in the first foreign matter adhesion determining means. And the second light reflectance covered by the second component to be read via the same or substantially the same position as the position read by the reading unit of the transparent body in the second foreign matter adhesion determining means. An image reading device characterized in that it can be reciprocated to and from a second moving position for reading reflected light from a reading member. The image reading device according to any one of claims 1 to 6.
Image reading characterized in that shading correction is performed after performing the first foreign matter adhesion determining means and the second foreign matter adhesion determining means, and the first reading data in the first foreign matter adhesion determining means is used for the shading correction. apparatus. The image reading device according to any one of claims 1 to 7.
Equipped with a notification device
When it is determined by at least one of the first foreign matter adhesion determining means and the second foreign matter adhesion determining means that foreign matter is attached to a portion corresponding to the reading position of the transparent body, the transparent body is said to be transparent. An image reading device characterized by displaying a display prompting the body to be cleaned. The image reading device according to any one of claims 1 to 8.
Equipped with a notification device
When the first foreign matter adhesion determining means determines that a foreign matter is attached to a portion corresponding to the reading position of the transparent body, the brightness is set at the portion corresponding to the reading position of the transparent body in the notification device. A display is displayed to notify that there is a possibility that a first foreign substance having a predetermined brightness or less or smaller than the predetermined brightness is attached.
When the second foreign matter adhesion determining means determines that foreign matter is attached to the portion corresponding to the reading position of the transparent body, the brightness is set at the portion corresponding to the reading position of the transparent body in the notification device. An image reading device comprising displaying to notify that a second foreign matter larger than or higher than the predetermined brightness may be attached. An image forming apparatus comprising the image reading apparatus according to any one of claims 1 to 9.

Images