JP2010087813A - Image reading unit, control method of image reading unit, and control program of image reading unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reading unit achieving stable reading. <P>SOLUTION: A contact type image reading unit reads a document 6 by using a reading part including a plurality of pixels 8 arrayed in two-dimensional manner. The plurality of pixels 8 each have a photoelectric conversion part for detecting light from the document and a light source for illuminating the document. The reading part is configured to transmit light, and the transmission state of light at the reading part is controlled by a liquid crystal layer 9. When no document is read, the liquid crystal layer 9 becomes translucent, and an operator can see the document 6 through the reading part. When reading the document, the liquid crystal layer 9 shields light, and external light 10 is prevented from entering the document 6 and the photoelectric conversion part. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an image reading apparatus, an image reading apparatus control method, and an image reading apparatus control program, and more particularly to an image reading apparatus capable of reading a two-dimensional image, an image reading apparatus control method, and an image reading apparatus. It relates to the control program.

  An electrophotographic image forming apparatus (scanner function, facsimile function, copying function, function as a printer, data communication function, and MFP (Multi Function Peripheral) having a server function, facsimile apparatus, copying machine, etc.) An image scanner (an example of an image reading apparatus) that reads an image from the document is provided.

  What is generally used as an image scanner at present is a reduction optical system. The reduction optical system includes a mirror scan method and a unit scan method.

  In any of these reduction optical systems, a one-dimensional sensor is mounted on the unit, and a two-dimensional image is read by scanning it. Therefore, it takes time for the unit to scan, and there is a limit to speeding up.

  Therefore, in the future, there has been proposed a scanner that can be used as an area sensor by arranging sensors without a mechanical movement mechanism over the entire document placement surface, and can read an image in a short space. The two-dimensional area sensor can read the loaded document data in a short time (instantly), and the module on which the reading sensor is mounted does not move. Therefore, there is no influence of vibration generated when the module moves, and the image quality is improved. There is an effect that pitch unevenness and color misregistration can be reduced. As a result, the two-dimensional area sensor is attracting attention as a future scanner.

  Each pixel constituting the two-dimensional image reading device (area sensor) is provided with RGB color light source units and a light receiving sensor unit (photoelectric conversion unit). At the time of reading, the RGB color light sources are sequentially turned on, and the light reflected from the original is read by the light receiving sensor unit. Then, the data of RGB colors are superimposed and output.

  Patent Document 1 below discloses a flexible detection device that includes an array of m × n cells, each cell detects a predetermined physical quantity, and includes an organic cell having a switching function connected to the sensor. . Patent Document 1 discloses a configuration in which image reading is performed by detecting light reflected from a document surface by external light using a sensor.

Non-Patent Document 1 below discloses a substantially transparent two-dimensional film-like image reading apparatus. Non-Patent Document 1 discloses a flexible contact-type sheet scanner having a structure in which a fixed light-shielding layer is arranged on the opposite side of the reading surface so that external light does not directly hit the sensor and detect the light during image reading. ing. As a result, only light incident from the opening and reflected by the document surface can be detected by the sensor.
JP-A-2005-150146 Takao Someya et al., “Research Projects: Large Area Electronics”, [online], Quantum Phase Electronics Research Center, Graduate School of Engineering, The University of Tokyo, Someya Laboratory, [Search September 29, 2008], Internet <http: / /www.ntech.tu-tokyo.ac.jp/Research/Research_project/Research_project_large_area_electronics/Research_project_large_area_electronics.html>

  However, the amount of external light varies depending on the place of work. As a result, it is difficult to control the amount of noise in the read image, and there is a risk of an image with a rough feeling. Furthermore, the shadows of the operator and the book may cause unevenness in the amount of external light, resulting in uneven density in the read image.

  In particular, when a conventional image reading apparatus is sandwiched between books, a light source cannot be secured at all, and an image cannot be read. That is, there is a problem that working conditions at the time of image reading are limited.

  The present invention has been made to solve such a problem, and provides an image reading apparatus, an image reading apparatus control method, and an image reading apparatus control program capable of performing stable reading. It is aimed.

  In order to achieve the above object, according to one aspect of the present invention, an image reading apparatus is an image reading apparatus that reads a document by using a reading unit having a plurality of pixels arranged two-dimensionally. Each includes a photoelectric conversion unit that detects light from the document, and the reading unit is configured to transmit light. The light source that irradiates the document and the light transmission state of the reading unit are A transmitted light control layer to be controlled.

  Preferably, the light source is a substantially transparent light emitting unit that is provided in each of the plurality of pixels and irradiates light on the document.

  Preferably, the transmitted light control layer is a layer that controls the incidence of external light, and when the document is not read, the transmitted light control layer is in a transmissive state so that an operator can view the document through the reading unit. When the original is read, the transmitted light control layer is shielded, so that the external light is blocked from entering the original and the photoelectric conversion unit.

  Preferably, the reading unit has one surface in contact with the document, and the transmitted light control layer is provided on the other surface different from the one surface.

  Preferably, the light source is provided at a position where the original surface can be irradiated with light when the transmitted light control layer is in a light-shielded state, and the photoelectric conversion unit is provided when the transmitted light control layer is in a light-shielded state. The reflected light from the document due to the irradiation of the light source is detected.

  Preferably, the image reading apparatus includes an active matrix circuit configuration for controlling a light source, a photoelectric conversion unit, and a transmitted light control layer for each pixel, and a drive circuit.

  Preferably, the layers including the photoelectric conversion portion and the light source are provided on both sides of the transmitted light control layer.

  Preferably, the image reading apparatus uses an electroluminescence element as a light source, and controls light emission by a thin film transistor arranged for each pixel.

  Preferably, the image reading apparatus detects color image information by using an element that emits red, blue, and green as a light source and controlling light emission using a thin film transistor arranged for each color.

  Preferably, the image reading apparatus uses a liquid crystal panel as the transmitted light control layer, and controls the amount of transmitted light by a thin film transistor arranged for each pixel.

  According to another aspect of the present invention, in a control method of an image reading apparatus that reads a document using a reading unit having a plurality of pixels arranged two-dimensionally, each of the plurality of pixels receives light from the document. A photoelectric conversion unit for detection is included, the reading unit is configured to transmit light, and includes a light source that irradiates a document, and a method is a transmitted light control that controls a light transmission state of the reading unit. Comprising steps.

  According to still another aspect of the present invention, in a control program for an image reading apparatus that reads a document using a reading unit having a plurality of pixels arranged two-dimensionally, each of the plurality of pixels includes light from the document. The reading unit is configured to transmit light, includes a light source that irradiates the document, and the program transmits light that controls the light transmission state of the reading unit. Causes the computer to execute control steps.

  According to these inventions, it is possible to provide an image reading apparatus capable of performing stable reading, a control method for the image reading apparatus, and a control program for the image reading apparatus.

  Hereinafter, an image reading apparatus according to an embodiment of the present invention will be described. The image reading apparatus includes a plurality of imaging elements arranged in a two-dimensional manner. The image reading apparatus employs the same magnification imaging (the resolution of the sensor (imaging device) itself is equal to the reading resolution of the document itself). In other words, the image reading apparatus is a contact type two-dimensional image reading apparatus that reads image information of a document with an area type image sensor unit, and performs photoelectric conversion and image processing.

  The image reading apparatus includes a light-emitting layer, a light-emission control unit that controls light emission luminance and light-emission timing, a photoelectric conversion layer that detects reflected light of a placed document, and signal charges generated in the photoelectric conversion layer as image data. An image signal control unit for converting to (image signal) and processing.

  A photodiode is used as the image sensor. One pixel includes an EL (electroluminescence) element, a photodiode, and a thin film transistor. The light source need not be an EL element.

  The contact-type two-dimensional image reading apparatus is substantially transparent (partially transparent) and includes a substantially transparent light emitting unit and a transmitted light control layer for blocking the influence of external light. When the image reading apparatus is placed on the original and is not read, reflected light from the original surface due to external light passes through the image reading apparatus. Thereby, the operator can confirm the reading range. When reading a document, the transmitted light control layer blocks the influence of external light (external light incidence). When reading a document, the light source of the pixel is turned on. As a result, reading using a light source having a sufficient amount of light for reading is realized without being affected by external light. As a result, it is possible to suppress the image noise amount and density unevenness.

  As the transmitted light control layer, for example, a liquid crystal layer such as a liquid crystal shutter can be used, but any layer may be used as long as it can control the degree of light transmission.

  [First Embodiment]

  FIG. 1 is a perspective view showing the overall appearance of the image reading apparatus according to the first embodiment of the present invention.

  Referring to the figure, an image reading apparatus 1 includes a reading unit 2 including a plurality of image pickup elements arranged in two dimensions. The image reading device 1 preferably has a film-like shape and physical properties. As a result, the image reading apparatus can be brought into close contact with the original or the curved surface, and the image on the surface can be read. The image reading apparatus 1 can transmit light at least partially. Thereby, the user (operator) can see the original document through the image reading apparatus in a state where the image reading apparatus 1 is placed on the original document 6. That is, the operator can easily check the reading range.

  FIG. 2 is a plan view of the image reading apparatus.

  The reading unit 2 includes a plurality of pixel units 3. One pixel unit 3 includes a light source unit 4 that transmits at least part of light and a sensor unit 5. The light source unit includes a RED light source, a GREEN light source, and a BLUE light source (each shown by different hatching).

  FIG. 3 is a diagram illustrating an outline of a cross-sectional configuration of the reading unit 2.

  The reading unit 2 controls a light source / sensor layer 8, a transparent ITO (indium tin oxide) layer 7 for power supply and control, and transmitted light from the side close to the document 6 (light transmission in the reading unit 2). And a liquid crystal layer 9 for controlling the degree).

  At the time of image reading, power is supplied to the light source 4 of the light source / sensor layer 8 of the lighting target pixel, and the pixel is turned on. The generated light is applied to the document 6. As a result, reflected light corresponding to the density of the document is generated.

  At this time, the liquid crystal layer 9 is in a state that does not transmit light (or a state in which the degree of transmission is low). Thereby, external light is prevented from entering the sensor unit 5.

  The sensor unit 5 of the pixel to be read receives reflected light from the original and generates a voltage corresponding to the reflected light by photoelectric conversion. A voltage generated at each pixel is detected, and a two-dimensional image of the document is reconstructed by the image processing unit.

  The light source unit 4 of each pixel unit 3 lights up three colors of red, blue, and green sequentially, and color reading is possible by detecting the voltage generated in the sensor unit 5 when the light of each color is turned on. .

  Regarding the lighting of the light source, only the light source of the reading target pixel may be turned on with respect to the reading target pixel, the light sources of the adjacent pixels may be turned on, or the light sources of all the pixels may be turned on.

  FIG. 4 is a block diagram illustrating a circuit configuration of the image reading apparatus.

  The reading unit 2 is provided with a plurality of pixel units 3 vertically and horizontally. Which pixel in the X and Y directions is caused to emit light by the column direction driving circuit 125 and the row direction driving circuit 127, which pixel in the X and Y directions is to be read, and which pixel in the X and Y directions is emitted. Whether to be in a standby state where neither reading nor reading is performed is controlled. The column direction driving circuit 125 and the row direction driving circuit 127 have a function of an image signal control unit that processes a signal charge generated in the photoelectric conversion layer of the pixel unit 3 as an image signal.

  In addition, the column direction drive circuit 125 and the row direction drive circuit 127 control which pixel in the X and Y directions of the liquid crystal layer 9 is to transmit light or not transmit light.

  In each pixel portion, a thin film transistor is arranged, and thereby light emission is controlled.

  Each of the column direction driving circuit 125 and the row direction driving circuit 127 is connected to the driving circuit 123 and driven by the CPU 121. That is, the reading unit 2 starts a reading operation in accordance with an external reading command, and the read data obtained thereby is output via the CPU 121.

  The image reading apparatus is mounted on a copying machine, a scanner, or the like.

  In the liquid crystal layer 9, it may be possible to control for each pixel whether to transmit light or not, and whether to transmit light or not transmit light. It is good also as controlling collectively in all the reading areas (all the pixels).

  As described above, the image reading apparatus includes an active matrix circuit configuration and a drive circuit for controlling the light emitting unit, the photoelectric conversion unit, and the transmitted light control layer for each pixel.

  FIG. 5 is a diagram illustrating reflection of external light when the image reading apparatus is not read in FIG. 3.

  During non-reading, the liquid crystal layer 9 is controlled to be in a transmissive state. As a result, the external light 10 is irradiated onto the document 6 through the liquid crystal layer 9, the ITO layer 7, and the transparent light source unit 4. The reflected light from the document 6 is reflected outside the image reading apparatus again through the light source unit 4, the ITO layer 7, and the liquid crystal layer 9. As a result, the operator can confirm the contents of the document in the reading range.

  FIG. 6 is a diagram illustrating reflection of external light during reading by the image reading apparatus in FIG. 3.

  This indicates a state when the image reading apparatus is in operation.

  At the time of reading, the liquid crystal layer 9 is controlled to be in a light shielding state. As a result, the external light 10 is reflected or absorbed by the liquid crystal layer 9 and does not enter the sensor side. In the light source / sensor layer 8, the light source unit 4 emits light to irradiate the irradiation light 11. The reflected light 12 reflected by the document 6 is detected by the sensor unit 5.

  The image signal detected by the sensor unit 5 passes through the drive circuit unit 123 and is stored as image information in a memory unit (not shown) in the CPU 121.

  Further, the light source unit 4 of each pixel unit 3 is divided into three light emitting units of red, blue, and green. The three color lights are sequentially turned on individually, and color reading is possible by detecting an image signal generated by the sensor unit 5 when each color light is turned on. Of course, the light source unit 4 may be configured to emit only one color instead of being color-compatible.

  As described above, the contact-type two-dimensional image reading apparatus includes a substantially transparent (partially transparent) reading unit, and has a configuration in which a user can check a document image through the reading unit. At the time of non-reading, the reflected light from the document surface by external light passes through the reading device. As a result, the user can check the reading range. When reading a document, it is possible to read with a light source that is uniform and has a sufficient amount of light without being affected by external light. Thereby, the amount of image noise and density unevenness can be suppressed. In addition, it is possible to avoid restrictions at the time of image reading work (restrictions such as that an image cannot be read while being sandwiched between books, and that a shadow should not be formed on external light hitting the sensor unit).

  [Second Embodiment]

  FIG. 7 is a diagram illustrating reflection of external light during reading by the image reading apparatus according to the second embodiment, and corresponds to FIG.

  Also in the second embodiment, at the time of non-reading, the liquid crystal layer 9 is controlled to be in a transmissive state (FIG. 5).

  As shown in FIG. 7, at the time of reading, only the liquid crystal layer 9 of the pixels in the vicinity of the pixel to be read is controlled so as to be in a light shielding state. Thereby, in the vicinity of the reading pixel, the external light 10 is reflected or absorbed by the liquid crystal layer 9 and does not enter the sensor side. In the light source / sensor layer 8, the light source unit 4 emits light in the vicinity of the reading pixel, so that the irradiation light 11 is irradiated. The reflected light 12 reflected by the document 6 is detected by the sensor unit 5.

  Further, the liquid crystal layer 9 is controlled to be in a transmissive state except in the vicinity of the reading pixel. As a result, outside the vicinity of the read pixel, the original light 6 is irradiated to the document 6 through the liquid crystal layer 9, the ITO layer 7, and the transparent light source unit 4. The reflected light from the document 6 is reflected outside the image reading apparatus again through the light source unit 4, the ITO layer 7, and the liquid crystal layer 9. As a result, the operator can check the contents of the document in the reading range except in the vicinity of the reading pixel.

  FIG. 8 is a plan view of the reading unit 2 of the image reading apparatus according to the second embodiment.

  A line indicated by hatching indicates a line made up of read pixels for reading a document. At the position of this line, the liquid crystal layer 9 is in a light shielding state. At other positions, the liquid crystal layer 9 is controlled to be in a transmissive state. By scanning the hatched line in the direction of the arrow, the image data on the entire surface of the reading unit 2 can be acquired.

  [Third Embodiment]

  FIG. 9 is a diagram illustrating a usage state of the image reading apparatus according to the third embodiment.

  Here, the document 6 is one book page, and shows a situation in which reading is performed by bringing the two-dimensional image reading apparatus 1 having the reading unit 2 into contact therewith.

  The two-dimensional image reading apparatus 1 can be brought into contact with the book while the book is opened, and an image on the page can be read using one side of the two-dimensional image reading apparatus 1. It is also possible to read the images on both pages that the two-dimensional image reading device 1 contacts by using both sides of the two-dimensional image reading device 1 with the book sandwiched between the books.

  FIG. 10 is a diagram illustrating an outline of a cross-sectional configuration of the reading unit 2 of the image reading apparatus according to the third embodiment.

  The reading unit 2 is configured to be able to simultaneously read documents on both sides of the image reading apparatus.

  The reading unit 2 includes transparent ITO layers 7a and 7b for power supply and control on both surfaces adjacent to the liquid crystal layer 9 with the liquid crystal layer 9 for controlling transmitted light as a center. Light source / sensor layers 8a and 8b are arranged on the surfaces of the ITO layers 7a and 7b close to the original, respectively. The originals 6a and 6b are read by the light source / sensor layers 8a and 8b, respectively.

  At the time of image reading, power is supplied to the light source / sensor layers 8a and 8b of the lighting target pixel, and the pixel is turned on. The generated light is applied to the document 6 (6a, 6b). As a result, reflected light corresponding to the density of the document is generated.

  At this time, the liquid crystal layer 9 is in a state that does not transmit light (or a state in which the degree of transmission is low). Thereby, external light is prevented from entering the sensor unit 5. Further, it is possible to prevent light from interfering between the front and back surfaces of the image reading apparatus.

  The sensor unit 5 of the pixel to be read receives reflected light from the original and generates a voltage corresponding to the reflected light by photoelectric conversion. A voltage generated at each pixel is detected, and a two-dimensional image of the document is reconstructed by the image processing unit.

  The light source unit 4 of each pixel unit 3 lights up three colors of red, blue, and green sequentially, and color reading is possible by detecting the voltage generated in the sensor unit 5 when the light of each color is turned on. .

  Regarding the lighting of the light source, only the light source of the reading target pixel may be turned on with respect to the reading target pixel, the light sources of the adjacent pixels may be turned on, or the light sources of all the pixels may be turned on.

  In the liquid crystal layer 9, it may be possible to control for each pixel whether to transmit light or not, and whether to transmit light or not transmit light. It is good also as controlling collectively in all the reading areas (all the pixels).

  FIG. 11 is a diagram illustrating reflection of external light when the image reading apparatus is not read in FIG. 10.

  During non-reading, the liquid crystal layer 9 is controlled to be in a transmissive state. As a result, the external light 10 is irradiated on the document 6 through the liquid crystal layer 9, the ITO layers 7 a and 7 b, and the transparent light source unit 4. The reflected light from the document 6 is reflected outside the image reading apparatus again through the light source unit 4, the ITO layers 7a and 7b, and the liquid crystal layer 9. As a result, the operator can confirm the contents of the document in the reading range.

  FIG. 12 is a diagram illustrating a state during reading of the image reading apparatus in FIG.

  This indicates a state when the image reading apparatus is in operation. In particular, the state of the image reading apparatus during simultaneous reading on both sides is shown.

  At the time of reading, the liquid crystal layer 9 is controlled to be in a light shielding state. Thereby, the upper and lower surfaces of the liquid crystal layer 9 are optically separated. The external light 10 is reflected or absorbed by the original 6b in the figure, and does not enter the sensor. In the light source / sensor layer 8, the light source unit 4 emits light to irradiate irradiation light. That is, the light source unit 4 of the light source / sensor layer 8 emits light on each surface of the image reading device, and the reflected light reflected by the originals 6a and 6b is detected by the sensor unit 5 on each surface of the image reading device.

  The image signal detected by the sensor unit 5 passes through the drive circuit unit 123 and is stored as image information in a memory unit (not shown) in the CPU 121.

  Further, the light source unit 4 of each pixel unit 3 is divided into three light emitting units of red, blue, and green. The three color lights are sequentially turned on individually, and color reading is possible by detecting an image signal generated by the sensor unit 5 when each color light is turned on. Of course, the light source unit 4 may be configured to emit only one color instead of being color-compatible.

  As described above, the contact-type two-dimensional image reading apparatus includes a substantially transparent (partially transparent) reading unit, and has a configuration in which a user can check a document image through the reading unit. At the time of non-reading, the reflected light from the document surface by external light passes through the reading device. As a result, the user can check the reading range. When reading a document, it is possible to read with a light source that is uniform and has a sufficient amount of light without being affected by external light. Thereby, the amount of image noise and density unevenness can be suppressed. In addition, it is possible to avoid restrictions at the time of image reading work (an image cannot be read while being sandwiched between books). Furthermore, in the third embodiment, a document image such as two pages of a book can be read at a time.

  [Others]

  The image reading apparatus may be a flexible apparatus such as a thin film or may not be so.

  The reading unit only needs to be able to transmit at least a certain amount of light during non-reading (semi-transparent and substantially transparent). For example, a configuration in which a transparent portion and a non-transparent portion such as a circuit wiring portion are included and light can be transmitted may be used. Furthermore, the reading unit only needs to be able to reduce the degree of light transmission at the time of reading than at the time of non-reading.

  In addition, as a light source of the pixel portion, an electroluminescence element may be used, and light emission may be controlled by a thin film transistor disposed for each pixel, or a white backlight light source, a color filter, and a liquid crystal panel may be used for each pixel. The light emission may be controlled by a thin film transistor. That is, the present invention can be applied to an image reading apparatus of a type in which a liquid crystal display device includes a plurality of reading elements.

  As a method for reading the image information of the document with the pixel at the specific position in the imaging state, so-called CMOS type signal processing is effective in which the signal charge generated in the pixel portion is detected as voltage data by switching.

  The image reading apparatus may be provided in an image forming apparatus such as a monochrome / color copying machine, a printer, a facsimile machine, or a multifunction peripheral (MFP) thereof.

  The processing in the above-described embodiment may be performed by software or by using a hardware circuit.

  In addition, a program for executing the processing in the above-described embodiment can be provided, and the program is recorded on a recording medium such as a CD-ROM, a flexible disk, a hard disk, a ROM, a RAM, and a memory card and provided to the user. You may decide to do it. The program may be downloaded to the apparatus via a communication line such as the Internet.

  In addition, it should be thought that the said embodiment is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

1 is a perspective view showing an overall appearance of an image reading apparatus according to a first embodiment of the present invention. It is a top view of an image reading apparatus. FIG. 3 is a diagram illustrating an outline of a cross-sectional configuration of a reading unit. It is a block diagram which shows the circuit structure of an image reading apparatus. It is a figure which shows reflection of the external light at the time of non-reading of the image reading apparatus in FIG. It is a figure which shows reflection of the external light at the time of reading of an image reading apparatus in FIG. FIG. 7 is a diagram illustrating reflection of external light at the time of reading by the image reading device according to the second embodiment, and corresponds to FIG. 6. It is a top view of the reading part 2 of the image reading apparatus in 2nd Embodiment. It is a figure which shows the use condition of the image reading apparatus in 3rd Embodiment. It is a figure which shows the outline of the cross-sectional structure of the reading part 2 of the image reading apparatus in 3rd Embodiment. It is a figure which shows reflection of the external light at the time of non-reading of an image reading apparatus in FIG. It is a figure which shows the state at the time of the reading of an image reading apparatus in FIG.

Explanation of symbols

1 Two-dimensional image reading device 2 Reading section (original setting area)
DESCRIPTION OF SYMBOLS 3 Pixel part 4 Light source part 5 Sensor part 6 Original document 7 ITO layer 8 Light source / sensor layer 9 Liquid crystal layer 10 External light 11 Irradiation light 12 Reflected light

Claims (12)

An image reading apparatus that reads a document by using a reading unit having a plurality of pixels arranged two-dimensionally,
Each of the plurality of pixels includes a photoelectric conversion unit that detects light from the document,
The reading unit is configured to transmit light,
A light source for illuminating the original;
An image reading apparatus comprising: a transmitted light control layer that controls a light transmission state of the reading unit.   The image reading apparatus according to claim 1, wherein the light source is a substantially transparent light emitting unit that is provided in each of the plurality of pixels and that irradiates light on a document. The transmitted light control layer is a layer that controls the incidence of external light,
When the document is not read, the transmitted light control layer is in a transmissive state so that an operator can see the document through the reading unit.
3. The image reading apparatus according to claim 1, wherein when the document is read, the transmitted light control layer is in a light-shielding state, thereby preventing external light from entering the document and the photoelectric conversion unit. The reading unit is a surface whose one surface is in contact with the document,
The image reading device according to claim 1, wherein the transmitted light control layer is provided on the other surface different from the one surface. The light source is provided at a position where the original surface can be irradiated with light when the transmitted light control layer is in a light-shielded state.
5. The image reading apparatus according to claim 1, wherein the photoelectric conversion unit detects reflected light from a document due to irradiation of the light source when the transmitted light control layer is in a light shielding state. 6.   6. The image reading apparatus according to claim 1, further comprising an active matrix circuit configuration for controlling the light source, the photoelectric conversion unit, and the transmitted light control layer for each pixel, and a drive circuit. .   The image reading apparatus according to claim 1, wherein the photoelectric conversion unit and the layer including the light source are provided on both surfaces of the transmitted light control layer.   The image reading apparatus according to claim 1, wherein an electroluminescence element is used as the light source, and light emission is controlled by a thin film transistor arranged for each pixel.   9. The color image information is detected by using light emitting elements that emit red, blue, and green as the light source, and detecting light emission using thin film transistors arranged for each color. 10. Image reading apparatus.   The image reading apparatus according to claim 1, wherein a liquid crystal panel is used as the transmitted light control layer, and a light transmission amount is controlled by a thin film transistor disposed for each pixel. A method for controlling an image reading apparatus that reads an original using a reading unit having a plurality of pixels arranged two-dimensionally,
Each of the plurality of pixels includes a photoelectric conversion unit that detects light from the document,
The reading unit is configured to transmit light, and includes a light source that irradiates the document.
A control method for an image reading apparatus, comprising a transmitted light control step for controlling a light transmission state of the reading unit. A control program for an image reading apparatus that reads a document using a reading unit having a plurality of pixels arranged two-dimensionally,
Each of the plurality of pixels includes a photoelectric conversion unit that detects light from the document,
The reading unit is configured to transmit light, and includes a light source that irradiates the document.
A control program for an image reading apparatus for causing a computer to execute a transmitted light control step for controlling a light transmission state of the reading unit.

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