JP2732085B2 - Index sheet for placing transparent documents - Google Patents

Description

Description: BACKGROUND OF THE INVENTION (Industrial Application Field) The present invention relates to a document illuminating device which is installed on a platen glass of a pixel reading device and is capable of reading a transparent document such as a slide film or an OHP sheet. In particular, the present invention is characterized by a transparent original placing index sheet applied to such an original illumination device.

(Prior Art) FIG. 11 shows an example of a reader incorporating a document illuminating device of this type. In the figure, A is an image reading device, B is a projector also serving as a light projector, and C is a mirror unit. The reader has three functions. The first function is a function as a small film reader, in which a small film is inserted into the projector B to illuminate light, and the transmitted light image is reflected by the mirror unit C and guided to the platen glass of the image reader A. To read an image. The second function is a function as a transparent original reading apparatus, in which a medium-sized or large transparent original having a size larger than the small film is placed on a platen glass of the image reading apparatus A, and light is projected from above. An image is read by illuminating light from a projector B as a projector. The third function is a function as a reflection original reading apparatus. An opaque original that does not transmit light is placed face down on the original platen glass of the original reading apparatus A, and another original provided inside the image reading apparatus A is provided. A document is illuminated by an illumination lamp to read an image.

First, a small film reader will be described. 1 is a slide film or a small film such as a 35 mm negative film, and 2 is an illumination lamp. The light emitted from the illumination lamp 2 passes through the condenser lens 3 and illuminates the small film 1, and the transmitted light 5 is directed toward the mirror unit C via the projection lens 4.

After that, the transmitted light 5 reaches the Fresnel lens 7 of the image reading device A by the reflection mirror 6 of the mirror unit C, and the transmitted light image of the small film 1 is formed on the document glass 8. Further, the transmitted light image is reflected by a reflection mirror in the image reading device A.
9 and 10 are moved and scanned to the positions indicated by broken lines 9 'and 10' in the figure, and sequentially imaged on the CCD 12 by the lens 11,
Read.

The Fresnel lens 7 is supported by the image reading device A by a Fresnel support plate 13. The reflection mirror 6
It is supported by a mirror support member 14 and is rotatable about a shaft 15 with respect to the Fresnel support plate 13. Thus, when the mirror unit C is not used, the mirror supporting member 14 can be bent as shown by a chain line in the figure, and the positioning pin 16 for positioning the Fresnel supporting plate 13 is disengaged from the image reading apparatus A. The mirror unit C can be detached together with the Fresnel lens 7 and the Fresnel support plate 13 from.

After detaching the mirror unit C, the image reading device A
Is a reflection original reading device used inside a conventional copier or the like for reading an opaque reflection original such as a document and a drawing placed on the platen glass 8.

Further, as a transparent original reading apparatus, for example, 8 inches × 10
When trying to read a medium-sized or large-sized transparent original such as an inch, the mirror unit C and the like are once detached from the image reading apparatus A, and the transparent original is placed on the original platen glass 8 as described above. In order to dispose the Fresnel lens 7, the mirror unit C and the like are mounted again.

(Problems to be Solved by the Invention) However, in the conventional reading device described above, the document placement reference for placing the transparent document at a desired position on the platen glass of the image reading device is based on the document placing glass. It is generally provided near the corners. However, if a transparent original is placed with respect to the original placement standard, the corners of the illumination area tend to be used, and the distribution of the amount of light illuminated on the original is not good. There is a disadvantage that an image is read by illuminating a transparent original in an area that is difficult to stabilize uniformly. On the other hand, if a transparent original is placed without using the original placement reference, the user does not know where to place the original because there is no placement standard. However, there is also a disadvantage that it is difficult to place a transparent original so as to match the right angle.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and a document illuminator capable of positioning a transparent document near the center of an illuminated area and capable of being arranged in parallel or perpendicularity to a scanning direction. The aim is to obtain a device.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, a transmissive film projecting device provided with a Fresnel lens can be mounted on a document reading device to which the document film reading device can be attached. An index for placing a transparent document is provided such that the center of the transparent document substantially coincides with the center of the Fresnel lens when the document is placed in accordance with the document placing index.

(Operation) Therefore, if the transparent original is set according to the index for placing the transparent original provided on the original reading device, the center of the transparent original almost coincides with the center of the Fresnel lens, and the original is placed under a uniform light amount distribution. The image is transmitted.

(Embodiment) FIGS. 1 to 10 show an embodiment of a document illumination device according to the present invention.
This will be described with reference to the drawings. Portions having the same functions as those in FIG. 11 showing the conventional example are denoted by the same reference numerals. The document illuminating device of this embodiment is incorporated in a reading device similar to that of the above-mentioned conventional example, and this reading device has three functions as in the prior art, namely, a small film reading device, a transparent document reading device, and a reflecting document. It has a function as a reading device.

First, FIGS. 1 to 4 show general views of the reading apparatus. That is, FIG. 1 is an overall perspective view of the reader, and shows a state in which the Fresnel lens 7 and the like are broken. FIG. 2 is a perspective view of the reading device and shows a state where a small film is inserted into the projector. FIG. 3 shows a sectional view of FIG. FIG. 4 is a diagram for explaining the operation of FIG.

The projector B, which also functions as a light projector, is fixed to the image reading device A via a table B1. The mirror unit C has a structure that can be folded by a mirror support member 14 that supports the reflection mirror 6 and a connecting plate 21. That is, one end of the connection plate 21 is rotatably attached to the mounting table B1 by the shaft 22, and the mirror support member 14 is rotatably connected to the other end of the connection plate 21 via the shaft 23. A roller 25 is rotatably attached to the other end of the mirror support member 14 via a shaft 24, and can run on the document table glass 8.
By the function of the connecting plate 21, the mirror supporting member 14 can be easily folded, and the above three functions can be easily switched. The connecting plate 14 is provided with a window 26 so as not to block light from the projector B.
Further, as will be described in detail later, an arm is used for positioning when the mirror supporting member 14 is folded and then re-expanded.
27 is provided, and a damper 28 is provided to absorb a shock when spreading.

Further, a Fresnel lens 7 and a transparent document pressing plate 29 are provided at the end of the mirror supporting member 14 on the side where the rollers 25 are provided so as to be rotatable by shafts 30 and 31, respectively. As a result, the Fresnel lens 7 and the original presser plate 29 are connected to the mirror support member 14 to be folded as described later in detail.
It can be folded inside. Therefore,
The fresnel lens 7 can be easily moved when a transparent original is placed on the original platen glass 8 or the like.

By the way, in this embodiment, a Fresnel lens 7 different from the above-mentioned conventional example is disposed above the document table glass 8 without keeping it in close contact with a space. The reason is as follows. Generally, the Fresnel lens 7 has a structure having concentric or parallel linear fine grooves on its surface. When the Fresnel lens 7 is brought into close contact with the platen glass 8, the fine grooves disturb the read image and adversely affect the image. As a method of preventing this, it is conceivable to make one surface of the Fresnel lens 7 a diffusion surface in a mat shape, but this is not preferable because it greatly reduces the amount of transmitted light. For this reason, in this embodiment, the Fresnel lens 7 is supported above the platen glass 8, and the groove of the Fresnel lens 7 is arranged so as to be located outside the focal range of the lens 11 of the image reading apparatus A.

 Hereinafter, each member will be described in detail.

The document presser plate 29 has a presser plate support plate 41 that supports the document presser plate 29 attached to the mirror support member 14 via a shaft 31 and is rotatable with respect to the mirror support member 14. The Fresnel lens 7 is supported in parallel above the document pressing plate 29. This support is performed by connecting one end of a Fresnel supporting plate 42 supporting the Fresnel lens 7 to the mirror supporting member 14 via the shaft 30.
It is performed by being rotatably attached to the. And a holding plate support plate 43 for supporting the other end of the document holding plate 29,
Fresnel support plate for supporting the other end of the Fresnel lens 7
44 is rotatably attached to the same link plate 47 via shafts 45 and 46, respectively. With this structure, the original presser plate 29,
Fresnel lens 7, link plate 47, and mirror support member 14
A parallel link mechanism is constituted by four shafts 30, 31, 45, 46. A handle 48 is provided on the edge of the Fresnel support plate 44 (see FIG. 2). This handle 48
By lifting in the direction of the arrow 49 (FIGS. 2 and 3), the Fresnel lens 7 and the original pressing plate 29 can be stored so as to be folded inside the mirror support member 14 (the solid line portion in FIG. Also, the function of the parallel link mechanism allows the Fresnel lens 7 and the original pressing plate 29 to operate.
The spacing becomes possible third from the interval h ₁ of Figure can be reduced to a distance h ₂ of FIG. 4, performs the convolution in a compact state. After folding the Fresnel lens 7 and the document pressing plate 29 in this way, the mirror support member 14 is folded as shown by the dotted line in FIG. At this time, since the roller 25 is provided on the mirror supporting member 14 and can run on the document table glass 8, a smooth folding operation can be performed. The rollers 25 are provided on the left and right sides of the mirror support member 14, that is, on the opposite side (not shown) as well as the one shown in the figure. After traveling, the roller 25 abuts against the stopper 50, and the mirror unit C is completely folded (the state indicated by the chain line C 'in FIG. 4).

The mirror unit C 'in the completely folded state
Since the roller 25 is located on the right side in the drawing with respect to the perpendicular V passing through the shaft 23, the entire mirror unit C 'generates a moment to fall around the shaft 22 by gravity applied to the mirror unit C'. Therefore, the roller 25 is urged in the direction in which it hits the stopper 50, that is, in the direction of the arrow 51 in the figure, and can maintain a completely folded state. Since the folded state can be maintained by such gravity, it is not necessary to use a latch part or a lock part in particular to maintain the folded state.

By bringing the mirror unit C 'into a completely folded state, the reading device can perform two other functions, that is, a function as a transmission original reading device and a reflection original reading device.

On the other hand, in order to expand the folded mirror unit C 'again, the mirror supporting member 14 must be moved by the arrow 52 in FIG.
By moving the roller 25 in the direction shown in FIG. 4 so that the position of the roller 25 is on the left side of the vertical line V in the figure (state C ″ shown by a dotted line in FIG. 4), the mirror unit C ″ tends to spread back to the original state by gravity. . At this time, when the reader using the reading device releases his / her hand from the mirror support member 14, the mirror unit C ″ rapidly spreads to a state C shown by a solid line in the figure, and the shafts 22 and 23 of the mirror unit C and the mirror support member 14 It is dangerous because a strong impact force is applied to the parts.

Therefore, in this embodiment, a damper 28 for absorbing an impact force is provided. Both ends of the damper 28 are provided rotatably with respect to the mirror support member 14 and the connecting plate 21 by shafts 61 and 62, respectively. Various known shock absorbers and the like can be used for the damper 28. FIGS. 5A and 5B show a preferred example of the damper 28 of the present embodiment. The figure is a longitudinal sectional view of the damper 28. The piston 64 in the cylinder 63 is fixed to the tip of a piston rod 65, and the piston rod 65 protrudes out of the cylinder 63 via a seal 66 provided at an end of the cylinder 63. The shaft 62 is provided at the protruding tip, and the other shaft 61 is provided at the other end of the cylinder 63. The piston 64 is provided with two partition members 67 and 68 arranged in front and rear, and a valve 69 which is sandwiched in a state of being advanced therebetween and slides on the inner wall of the cylinder 63.
Consists of Partition body located in front of piston rod 65
A small orifice 70 is formed in 67, and a rear partition 68
Has a large orifice 71 formed therein. Also, two spaces 72, 7 in the cylinder 63 separated by the piston 64
3 is filled with gas.

When the damper 28 is extended, that is, FIG.
When the other shaft 62 moves in the direction of the arrow 74 in the figure with respect to the shaft 61, the gas in the space 73 flows as shown by the arrow 75, but if the gas does not pass through the small orifice 70, the other space 72
Therefore, when the gas passes through the small orifice 70, a large resistance is generated and a damper effect is obtained. On the other hand, when the damper 28 compresses,
When the shaft 62 moves in the direction of the arrow 76 in the figure with respect to the shaft 61 as shown in FIG. 7B, the position of the valve 69 changes, and the gas in the space 72 can move to the space 73 through the large orifice 71. Therefore, there is almost no damper effect.

The dampers 28 having the above-described configuration are used at the left and right sides of the mirror unit 14, that is, at the illustrated positions and the opposite positions (not illustrated). Due to the damper effect of the damper 28, the impact force is absorbed, and even when the reader using the reader suddenly separates the mirror unit C ″ at the position shown in FIG. It travels slowly on the platen glass 8. The Fresnel lens 7 and the document holding plate 29 are also slowly moved to the platen glass 8.
Get off towards. The final position of the mirror unit C that spreads to the original state is determined by the arm 27. One end of the arm 27 is rotatably provided with respect to a shaft 61 provided on the mirror support member 14, and the other end slides and rotates by a long hole 82 with respect to a shaft 81 provided on the connecting plate 21. Mounted movably. The arm 27 is a mirror unit C
Are provided at the left and right sides, that is, at the illustrated position and at the opposite side (not illustrated). This allows the mirror unit C
Stops the operation of expanding the shaft 81 of the connecting plate 21 at a position where the shaft 81 abuts the edge of the long hole 82 of the arm 27 and stops. At this position, the mirror 6 of the mirror support member 14 is at a predetermined angle.

As described above, the action of the damper 28 and the arm 27 can prevent a strong impact force from being applied to the shafts 22 and 23 of the mirror unit C, the mirror support member 14, and the like. The variation in the angle of No. 6 was also reduced. According to the inventor's experiment, the variation in the angle when the operation of extending the mirror unit was repeated was several minutes to several tens of minutes. Furthermore, when the Fresnel lens 7 and the document pressing plate 29 are folded and the mirror unit C is folded, the damper 28 does not produce a damper effect, so that the damper 28 can be smoothly folded and stored without resistance. Although two dampers 28 are provided on the left and right sides of the mirror unit C in the drawing, the damper effect can be obtained by providing only one of the right and left in other embodiments.

FIG. 6 shows a perspective view of a film carrier 91 used when inserting a small film into the projector.

When inserting and projecting a small film such as a 35 mm film or a slide film into the projector B, the sixth
The small film 1 is sandwiched between film carriers 91 as shown in the figure. The film carrier 91 has a shape in which two plates 92 and 93 are closed by a hinge, and a small film can be sandwiched between them. A window 94 is formed in each of the two plates 92 and 93 so that light can pass through the sandwiched small film. After the small film 1 is sandwiched between the film carriers 91 in this manner, the film carrier 91 is inserted into the carrier holes 95 of the projector B as shown in FIG.
Insert By moving the film carrier 91 in the inserted state, a desired frame is displayed on the illumination lamp 2 of the projector B.
On the optical axis of Thereafter, by performing a predetermined input from the operation panel A1 of the image reading apparatus A, the same image reading operation as described in the above-described conventional example is performed.

In the present embodiment, the 35 mm film has a function of inserting a small film such as a small slide film into a projector and reading the film, and has a function of 8 inches × 10 inches, 4 inches × 5 inches or
It also has a function as a transmissive original reading device for placing an OHP film or the like, that is, a medium or large transparent original on a platen glass and reading it. Further, it also has a function as a reflection original reading device for placing a light-impermeable opaque original on a platen glass in a prone state and reading the reflected light of the irradiated light. As shown in FIG. 1, the original glass platen 8 has a first original placing reference 101 serving as a standard for placing an opaque original when reading a normal opaque original (document, drawing, etc.).
Are provided at the corners. When placing a medium-sized transparent original on the original platen glass 8, first, a transparent original reference sheet 102, which is a transparent original placing index sheet, is positioned with respect to the first original placing reference 101. The corners of the transparent original reference sheet 102 serve as a second original placing reference 103, and the transparent original 104 corresponds to the second original placing reference 102.
Position.

The transparent original reference sheet 102 is, for example, shown in FIG.
Or an L-shaped transparent sheet shown in FIG. 7B or a sheet having an L-shaped colored portion 105 and a transparent portion 106 shown in FIG. Each of the L-shaped corners serves as a second document placement reference 103.

FIG. 8 is a sectional view of the document pressing plate 29. Fig. 8 (a)
FIG. 8B shows a case where the transparent original 104 is not placed, and FIG.
02 indicates a state of being placed at a preferable position. The document holding plate 29 is supported with a gap 111 with respect to the holding plate support plates 41 and 43. For this reason, FIG.
In the case of (1), the document holding plate 29 is placed in close contact with the platen glass 8, and in the case of FIG. 8 (b), the thickness of the transparent document 104 is absorbed by the gap 111, and the weight of the document holding plate 29 Transparent original 104
Is pressed against the platen glass 8 to be in close contact therewith. As described above, by using the document pressing plate 29, the transparent document 104 is closely mounted on the document table glass 8 without causing a problem such as a slack or waving on the surface.

FIG. 9 is a plan view showing a state in which the transparent original 104 is placed on the original table glass 8. Fig. 9 (a) is 8 inches x
This shows a state in which a large photographic film such as a 10-inch film or a large film such as an OHP film is placed as a large-sized document. FIG. 9B shows a state in which a photographic film of 4 inches × 5 inches or the like is placed as a medium-sized transparent original.

In FIG. 9A, an L-shaped transparent original reference sheet 102 having a small width is used, and a large original 1
It is placed with the 04 corners aligned. As a result, the center 121 of the refresnel lens 7 is
It is almost in the center.

However, when a medium-sized transparent document 104 'is placed using the narrow L-shaped transparent document reference sheet 102 (FIG. 9 (a), two-dot chain line), the center 12 of the Fresnel lens 7 is moved.
Reference numeral 1 denotes a position spaced apart from the center of the medium-sized transparent document 104 '. At a position distant from the center of the Fresnel lens 7, the light amount distribution is not uniform, which is not preferable.

Therefore, as shown in FIG. 9B, a wide L-shaped transparent original reference sheet 102 'is used. Thus, a new second document placement reference 103 'can be provided.
By using a wide L-shaped transparent original reference sheet 102 ', the center 121 of the Fresnel lens 7 can be located near the center of the medium-sized transparent original 104'. As a result, it is possible to eliminate the adverse effects caused by the uneven light amount distribution.

FIG. 10 is a perspective view of the back surface of the mirror support member 14. FIG. The back of the mirror support member 14 has a seat pocket
131 is provided, and a small, medium, or large transparent document 104 can be stored. Thereby, it is possible to prevent the various originals and the like from being dissipated.

[Other embodiments]

In the above-described embodiment, the reading device in which the document illumination device is incorporated is described as having the image reading device A that reads an image using a CCD, but the present invention is not limited to this.
For example, the present invention can be applied to a copying machine or the like that forms transmitted light or reflected light from a document on a photosensitive member.

Further, in the above-described embodiment, two types of the L-shaped transparent original reference sheet for providing the second original placement reference, that is, a narrow one and a wide one, have been described. It is also possible to provide three or more types of transparent document reference sheets according to the size of the transparent document.

(Effect of the Invention) As described above, by setting a transparent original according to the index for placing the transparent original by the index sheet for placing the transparent original applied to the original illumination device of the present invention, the center of the transparent original and the Fresnel Since the original image can be transmitted under the uniform light amount distribution with the centers of the lenses almost coincident, the transmitted original can be read with the uniform light amount distribution.

[Brief description of the drawings]

FIG. 1 is an overall perspective view of a reading device in which an embodiment of a document illumination device according to the present invention is incorporated, and FIG. 2 is an overall perspective view showing a state in which a small film is inserted into the reading device. 3, FIG. 3 is a sectional view of FIG. 2, FIG. 4 is a view for explaining the operation of FIG. 3, FIG. 5 (a) is a sectional view of the damper of FIG. 1 to FIG. FIG. 6 (b) is a view for explaining the operation of FIG. 5 (a), FIG. 6 is an enlarged perspective view of the film carrier used in FIG. 2, and FIGS. 7 (a) and 7 (b) are used in FIG. FIG. 8 (a) is an enlarged view of the original pressing plate of FIG. 3, and FIG. 8 (b) is a diagram for explaining the operation of FIG. 8 (a). 9 (a) and 9 (b) are plan views showing a state where a transparent original is placed using the transparent original reference sheet of FIG. 7 (a).
FIG. 1 is a perspective view showing the back surface of the mirror supporting member shown in FIGS. 1 to 4, and FIG. 11 is a sectional view showing a conventional reader. DESCRIPTION OF SYMBOLS 1 ... Small film (transparent original) 2 ... Illumination lamp (light source) 3 ... Condenser lens 4 ... Transparent lens 5 ... Transmitted light 6 ... Reflective mirror 7 ... Fresnel lens 8 ... … Original platen glass (Original plate) 9,10… Reflection mirror, 11… Lens 12… CCD (light receiving part) 101… First original placing standard 103… Second original placing standard 104 … Transparent original A… Image reading device B… Projector (projecting means) C… Mirror unit

Claims (1)

(57) [Claims] 1. A document reading apparatus to which a transmissive film projection device having a Fresnel lens can be attached,
An index for placing a transparent document is provided so that the center of the transparent document substantially coincides with the center of the Fresnel lens when the document is placed in accordance with the document loading index of the document reading apparatus. Placement index sheet.