JPH082079B2 - Image reader - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image reading apparatus that reads an image of a document, a film, or the like by photoelectric conversion and performs digital image processing. In particular, the present invention relates to an image reading apparatus having a film reading function. The present invention relates to an image reading device suitable for a color copying machine, a color image scanner, a color printer and the like.

[Prior Art] Generally, in an image reading apparatus that can obtain a digital image signal, an image sensor such as a CCD (charge coupled device) is used as a photoelectric conversion unit. It is necessary to perform shading correction in order to correct the deviation of the light amount distribution in the characteristics of the system. This shading correction reads a standard image prepared in advance using the same original illumination lamp and optical system as when reading the actual image, and stores the read image data in the internal memory as shading correction data. It is common practice to make a correction based on this correction data when reading the document. Generally, when reading a reflection image of a document placed on the platen glass like an ordinary copying machine, a standard white plate fixed on the platen glass is read as a standard document and shading correction is performed. Is going.

On the other hand, in the case of a copier having a film reading function that reads a film projection image from a film projector as an original, a standard film for shading correction data acquisition is attached to the film projector and the projection image projected from this film is displayed. There is a method of performing shading correction as a standard document. This correction method uses the same optical system as when reading the original film, so the correction can be performed accurately, and the difference in film characteristics between film manufacturers can be absorbed by changing the standard film for each manufacturer. There are features.

[Problems to be Solved by the Invention] However, in a conventional copying machine having such a film reading function and a shading correction function, the standard film and original film management described above are left to the operator. Shading with
This has caused erroneous operations such as shading with the original film, reading without the film, and normal reading with the standard film.

The present invention has been made in view of the above-mentioned points, and an object thereof is to take in and out a standard film or original film for obtaining shading data by hand in order to downsize the device and reduce the device cost. It is another object of the present invention to provide an image reading device capable of preventing an erroneous operation that may occur in the case of such a configuration.

[Means for Solving the Problems] In order to achieve the above object, the present invention reads a film image projected by a film projection exposure means as an original image by a photoelectric conversion means, and outputs an output signal of the photoelectric conversion means. In an image reading apparatus that performs shading correction by using a film projection exposure means, is the film holder mounting portion of the film projection exposure means, and the holder mounted in the film holder mounting portion a film holder for holding a standard film for data acquisition? A detecting means for detecting whether or not the film holder holds the original film, and the detection output of the detecting means detects that the film holder holding the standard film is not attached at the time of obtaining the shading correction data. Warning is issued, and the original file fills when reading the film image. And a warning means for issuing a warning when it is detected that the film holder for holding the film is not mounted.

Further, the present invention is, as one aspect thereof, characterized in that the film projection exposure means makes the mounting positions of a film holder holding the standard film and a film holder holding the original film different from each other. it can.

Further, as another aspect of the present invention, the film holder may have a notch, a hole or a pattern detected by the detecting means.

[Operation] In the present invention, whether the holder mounted in the film holder mounting portion is a film holder for holding the standard film for data acquisition by the detection means provided in the film holder mounting portion of the film projection exposure means. , It is detected whether the film holder holds the original film. Then, the warning means issues a warning when it is detected by the detection output of the detection means that the film holder for holding the standard film is not attached at the time of obtaining the shading correction data, and at the same time, the original film is read when the film image is read. A warning is issued when it is detected that the holding film holder is not installed. Therefore, according to the present invention, it is possible to prevent the operation that may occur in the image reading apparatus in which the standard film for obtaining the shading data or the original film is manually taken in and out.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

A. Overall Configuration FIG. 1 shows an example of the external appearance of a digital color copying machine to which the present invention is applicable, to which a film projection system described later can be mounted. The entire copying machine can be divided into two parts.
First, the upper part of FIG. 1 shows a color image scanner unit 1 (hereinafter, referred to as a scanner unit) for reading an original image and outputting digital color image data, and a digital color image built in the scanner unit 1. The controller unit 2 performs various image processing of data.

The scanner unit 1 has a built-in mechanism for reading a large-size sheet document in addition to reading a three-dimensional object such as a book placed below the document holder 11 and a normal-size sheet document.

An operation unit 10 provided above the scanner unit 1 is connected to the controller unit 2 and is used to input various operation information for operating as a copier. The controller unit 2 issues an operation instruction to the scanner unit 1 and the printer unit 3 according to the operation information input from the operation unit 10. Furthermore, if you need to perform complicated editing processing, replace the document holder 11 with a digitizer etc.
By connecting this to the controller unit 2, advanced information input processing becomes possible.

The lower part of FIG. 1 is a printer unit 3 for recording a color digital image signal output from the controller unit 2 on paper (recording paper). As the printer unit 3, for example, a full-type printer using a bubble jet type recording head is used.
A color ink jet printer can be used.

The two parts 1 and 3 described above are separable and can be installed at remote locations by extending the connecting cable.

B. Film Projection System The scanner unit 1 can be equipped with a projection exposure unit (film projector) for projecting a film. FIG. 2 shows a projector unit 81 which is a projection exposure unit in the scanner unit 1.
An external view when the reflection mirror 80 is attached is shown.

The projector unit 81 is a projector for projecting a negative film or a positive film, and the film is held by a film holder 82, and the projector unit 81
Attached to 81.

FIG. 3 and FIG. 4 each show a cross section in a state where the film holder 82 is attached to the projector unit 81.

The film holder 82 can be mounted on the projector unit 81 from above as shown in FIG. 3 or from the side as shown in FIG. The arrow in the figure indicates the mounting direction of the film holder 82. This is because, since the shape of the film is rectangular, it is possible to change whether the projected image of the film is portrait or landscape in the mounting direction of the film holder 82.

A holder sensor 97 fixed to the bottom inner wall of the projector unit 81 is a sensor for detecting the film holder 82 when the film holder 82 is mounted from above as shown in FIG. In addition, the projector unit 81
The holder sensor 94 fixed to the side inner wall of the
A sensor 82 is provided for detecting the film holder 82 when it is mounted from the side as shown in FIG. The outputs of the sensors 94 and 97 are output to the control unit 102 of the scanner unit 1 described later.
When the control unit 107 of the controller unit 2 communicates with the control unit 102, the two sensors 94 and 97 are connected.
In the output state, it is possible to detect whether the film holder 82 is mounted from above, from the side, or not mounted at all.

Further, in the present embodiment, the shape of the film holder 82A that holds the standard film used when obtaining the shading correction data in the film holder 82 described above and the shape of the film holder 82B that holds the original film used during actual reading are changed. A sensor (detector) provided in the projector unit 81 discriminates between the two holders 82A and 82B.

FIG. 3 shows a case where a type of film holder 82A holding a standard film for obtaining shading correction data is mounted on the projector unit 81 from above, and FIG. 4 is a type of film holder 82B holding an original film.
The case where is attached to the projector unit 81 from the lateral direction is shown. The shading holder sensor 96 arranged at the bottom of the projector unit 81 has two types of holders 82 when the film holder 82 is mounted from above.
A shading holder sensor 95 provided on the inner side wall of the projector unit 81 is a film holder which is a detecting means such as a photo coupler for distinguishing between A and 82B.
A detection means such as a photo coupler for discriminating the above-mentioned two types of holders 82A and 82B when 82 is mounted from the lateral direction. Further, in FIG. 3, AA is a notch provided in the longitudinal end portion of the film holder 82A for holding the standard film, and the sensor 96 or 95 detects the notch, whereby the standard film holder 82A.
Is determined.

FIG. 5 shows a schematic configuration example of the film projection system of FIG. As shown in FIG. 5, the image of the film (projected image) projected from the projector unit 81 is reflected by the reflection mirror 80 and reaches the Fresnel lens 83. The Fresnel lens 83 converts this image into parallel light, and
Image on top. Thus, the image of the negative film or the positive film set in the film holder 82 is
Since an image is formed on the platen glass 17 by the projector unit 81, the reflection mirror 80, and the Fresnel lens 83, the image can be read by the CCD (charge coupled device) unit 18 of the photoelectric conversion means in the same manner as the reading of the document by reflected light. .

Here, the projector unit 81 is a halogen lamp
90, a reflection plate 89, a condenser lens 91, a film holder 82, and a projection lens 92. The direct light emitted by the halogen lamp 90 and the reflected light by the reflector 89 are condensed by the condenser lens 91 and reach the window 93 of the film holder 82 (see FIGS. 3 and 4). Film holder 82
Has a window 93 slightly larger than one frame of negative film or positive film, so that the film can be mounted inside with a margin.

The projection light reaching the window 93 of the film holder 82 is transmitted through the film mounted therein to obtain a projection image of the film. The projection image obtained in this manner is
After being optically expanded by, the direction is changed by the reflection mirror 80, and then converted into a parallel light image by the Fresnel lens 83. This image is stored in the CCD unit 18 inside the scanner 1.
And converts it into an electrical image signal (video signal).

C. Circuit Configuration FIG. 6 shows a circuit configuration example of the digital color copying machine according to the embodiment of the present invention.

The control units 102, 107 and 108 are control circuits for controlling the scanner unit 1, the controller unit 2 and the printer unit 3, respectively, and include a microcomputer, a program ROM, and a program ROM, respectively.
It is composed of a data memory, a communication circuit and the like.
The control units 102 and 107 and the control units 107 and 108 are connected by a communication line, and the control unit 1 is instructed by the control unit 107.
A so-called master / slave control mode in which 02 and 108 perform a predetermined operation is adopted. Also, the control unit 107
When operating as a color copier, the operation is performed in accordance with an input instruction from the operation unit 10.

As shown in FIG. 2 described above, the operation unit 10 uses a liquid crystal (LCD display unit 84) as a display unit, and has a touch panel 85 made of a transparent electrode on the surface thereof to specify a color. , And editing operation can be specified. Keys related to the operation, for example, a start key 87 which is a key for instructing the start of a copying operation, and a stop key which is a key for instructing a stop of the copying operation.
Frequently used keys such as a key 88, a reset key 89 for returning the operation mode to the standard state, and a projector key 86 for selecting a projector are provided independently.

Further, the control unit 107 in FIG. 6 controls the image processing unit 106 that performs various types of processing related to images.

The control unit 102 controls the mechanical drive unit 105 that controls the drive of the mechanical portion of the scanner unit 1 described above, and also the exposure control unit that controls the exposure of the illumination lamp when reading an original by reflected light.
The exposure controller 104 controls the exposure of the halogen lamp 90 when the projector unit 103 and the projector unit 81 are used. Further, the control unit 102 includes an analog signal processing unit 100 that performs various kinds of necessary processing related to an image on the image signal input from the CCD unit 18, and a shading correction circuit.
The control of 101 is also performed.

 The control unit 108 controls the printer unit 3 described above.

The shading correction circuit 101 is an analog signal processing unit 100.
The output signal of the image sensor 18 such as CCD, the variation of each pixel of the image sensor 18, the illumination lamp 90 and the optical system (91, 92
Shading correction for correcting the deviation of the light amount distribution in the characteristics of (1) and the like. As is well known, this shading correction reads a standard image using the same illumination lamp and optical system as when reading an actual original image,
Image data for one line of the image sensor 18 at this time is held in the internal memory as data for shading correction, and correction is performed based on this correction data when reading an actual document image.

In this embodiment, when a document on the platen glass 17 is read, a standard white plate (not shown) fixed on the platen glass 17 is used as a standard image to perform shading correction, and the projection document from the film projector unit 81 is projected. When reading an image (film image), the standard film of the film holder 82A is mounted on the film projector unit 81, and the shading correction is performed by using the projected image of this film (referred to as standard film) as the standard image. There is.

D. Operation Procedure FIG. 7 shows a control procedure previously stored in the program ROM in the control unit 107. Next, a control procedure according to the present invention performed by the control unit 107 will be described with reference to the flowchart of FIG.

When the power of the device is turned on (ON), step SP10 is first performed.
Initialize with 0. Next, in step SP101, it is determined whether or not the start key 87 for instructing the start of the copying operation is pressed.

If the start key 87 is pressed, it is determined in the next step SP102 whether or not the projector mode is set, and if it is set in the projector mode, the next step SP103 is that the projector unit 81 is operated. The projected original image (film image) is read, and the recording is copied. If the projector mode is not set, the image of the reflection original placed on the original glass 17 is copied in step SP104 as in a normal copying machine. Performed together and returns to step SP101 again.

On the other hand, if the start key 87 is not pressed, it is determined in step SP105 whether the projector shading key 190 (see FIG. 8) is pressed. The projector shading key 190 is displayed on the LCD display 84 only when the projector mode is set,
Key input is performed using the touch panel 85.

If the projector shading key 190 is pressed, it is checked in step SP106 whether or not the film holder 82A containing the standard film is attached to the film projector unit 81.
It is determined by the output of 5,96, and if the holder is not attached, the message that prompts the attachment of the holder, for example, "Please attach a standard film." Is displayed on the LCD as shown in Fig. 8 in step SP107. Display and output on the unit 84. After that, wait for the film holder 82A containing the standard film to be attached, and in step SP108, turn on the halogen lamp 90, read the projected image of the standard film with the CCD unit 18, and read the read image data for shading correction. Shading correction circuit 10 as correction data for
Hold in memory within 1. After that, the process returns to step SP101.

When the projector shading key 190 is not pressed in the above-mentioned step SP105, it is then determined in step SP109 whether or not the projector key 86 is pressed. If the projector key 86 is pressed, it is further determined in step SP110. Judges whether the projector mode is set or not, and sets the projector mode in step SP111 if the projector mode is not set, and cancels the projector mode in step SP112 if the projector mode is set. Both are then step SP
Return to 101. That is, the projector key 86 functions as a changeover switch for turning on / off the projector mode.

If the projector key 86 is not pressed in step SP109, it is then determined in step SP113 whether or not any other key is pressed. If any other key is pressed, that key is selected in step SP114. Set the corresponding copy mode. The mode setting includes, for example, a magnification setting and a number setting. After that, the process returns to step SP101.

If no other key is pressed in step SP113, nothing is done and the process returns to step SP101.

E. Modified Example In the above-mentioned embodiment, the film holder containing the standard film and the film holder containing the original film are mounted at the same position in the projector unit, but in order to further reduce confusion, the mounting is performed. The positions may be different from each other.

In this case, by arranging the standard film on the platen glass at a position where it does not form an image, the projected image of the standard film is blurred, and as a result, the effect of image smoothing is obtained and It is possible to prevent the shading correction from being affected by the dust and the graininess of the film.

Further, even when the original film is not loaded at the time of reading the original film, the operator may be warned by displaying the fact.

[Effects of the Invention] As described above, according to the present invention, when it is detected that the film holder for holding the standard film is not attached at the time of obtaining the shading correction data by using the detecting means and the warning means. In addition to issuing a warning to the device, a warning is issued when it is detected that the film holder that holds the original film is not attached at the time of reading the film image, so in order to downsize the device and reduce the manufacturing cost, data acquisition It is possible to reliably prevent an erroneous operation that may occur in the case of such a structure in which the standard film or original film for use in and out is manually put in and taken out. That is, shading without standard film, shading with original film, scanning without film,
It is possible to prevent an erroneous operation such as performing normal reading on a standard film, and thereby to significantly reduce mishandling of the standard film in the shading correction operation and the recording operation.

[Brief description of drawings]

FIG. 1 is a perspective view showing an appearance example of a digital color copying machine to which the present invention is applied, and FIG. 2 is an example of a state in which a projector unit which is projection exposure means and a reflection mirror are attached to the scanner section of FIG. FIG. 3 is a sectional view showing a state in which a film holder for a standard film is vertically attached to the projector unit of FIG. 2, and FIG. 4 is a horizontal direction of the projector unit of FIG. FIG. 5 is a sectional view showing a state in which a film holder for a manuscript film is attached to FIG. 5, FIG. 5 is a sectional view showing a detailed arrangement configuration example of the film projection system in FIG. 3, and FIG. 6 is a digital color copying machine in FIG. FIG. 7 is a block diagram showing an example of the circuit configuration of FIG. 7, FIG. 7 is a flowchart showing an example of control operation of the control unit 107 in FIG. 6, and FIG. 8 is FIG. 2 in the case where there is no standard film when the shading key is pressed. It is explanatory drawing which shows the example of a display of the operation part. 1 ... Scanner part, 2 ... Controller part, 3 ... Printer part, 10 ... Operation part, 17 ... Original platen glass, 18 ... CCD unit, 80 ... Reflecting mirror, 81 ... Projector unit, 82 …… Film holder, 82A …… Standard film film holder, 82B …… Original film film holder, 83 …… Fresnel lens, 84 …… LCD display, 85 …… Touch panel, 86 …… Projector key, 87 …… Start key, 88 ... Stop key, 89 ... Reset key, 93 ... Window, 94,97 ... Holder sensor, 95,96 ... Shading holder sensor, 102,107,108 ... Control section, 100 ... Analog signal processing Section, 101 ... Shading correction circuit, 106 ... Image processing section, 190 ... Projector shading key.

Claims (3)

[Claims] 1. An image reading apparatus for reading a film image projected by film projection exposure means as an original image by photoelectric conversion means and performing shading correction on an output signal of the photoelectric conversion means, wherein the film projection exposure means comprises: Detecting means provided in the film holder mounting portion and detecting whether the holder mounted in the film holder mounting portion is a film holder holding a standard film for data acquisition or a film holder holding an original film When the detection output of the detection means detects that the film holder for holding the standard film is not attached at the time of obtaining the shading correction data, a warning is issued, and the original film is held at the time of reading a film image. That the film holder is not attached Image reading apparatus characterized by comprising a warning means for issuing a warning when issued. 2. The apparatus according to claim 1, wherein the film projection exposure means makes the mounting positions of the film holder holding the standard film and the film holder holding the original film different from each other. An image reading device characterized by. 3. The apparatus according to claim 1 or 2, wherein the film holder has a notch, a hole or a pattern which is detected by the detecting means. Image reading device.