JP2004040443A - Image reader and image processor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively realize an image reader and an image processor, in which the stable operation of a light source can be guaranteed while more shortening a period of time required for completing procedures, namely the generation of black correction data, the lighting of light sources, the generation of white correction data and the reading of original from the generation of a reading start signal. <P>SOLUTION: A series of following operations are carried out by means of an ADF control substrate independent from a main body control section when starting up a power source through: starting the operation by a reading start signal generated by the ADF control substrate; firstly, reading black data by n-numbered line portion by means of a contact type image sensor during a light source lighting outs period L1 for generating the data for black correction, then lighting a major light source and an auxiliary light source; repeating the flashing operation of the light sources for a period L5; increasing the starting voltage of the light sources; promptly stably emitting light in reading a standard white board (SLEAD: a reading range signal) after the period L5 and manuscript (SSCAN: a reading range signal) reading. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image reading apparatus and an image processing apparatus (a scanner, a digital copying machine, a digital facsimile, etc.) equipped with the image reading apparatus, and more particularly to lighting of a light source and a line image performed in a preparation stage before reading an original. The present invention relates to an image reading device and an image processing device that perform each operation of generating reference black correction data for all lines of a sensor in a quick, appropriate, and simple manner.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, an image reading apparatus provided in a scanner, a copying machine, or the like has a line image sensor, and converts a target image of a document illuminated by a light source by a photoelectric conversion unit (for example, a CCD: Charge Coupled Device) of the line image sensor. The signal is converted into a time-series electrical signal by the line scanning method, and the converted image signal is output as a digital signal.In the process, the image signal is corrected and converted, and the used device is output as a normalized digital image signal output For use.
For example, in the analog image signal from the line image sensor that has read the target image, there are variations in the sensitivity of sensor pixels and variations in signal components due to dark current. In such a case, the dynamic range of the A / D conversion circuit is increased. In order to be able to correct the error due to the variation, the sensor output is corrected by the black and white shading correction data. Conventionally, this correction uses a method of adjusting a reference voltage of an A / D conversion circuit or performing shading correction based on data obtained by reading a reference black and white by a line image sensor in sensor pixel units. More known.
[0003]
Here, paying attention to black correction, different methods are used for generating data used for reference black correction depending on the type of line image sensor. For example, a sensor used for an ADF (Auto Document Feeder: automatic document feeder) mode reading operation (an operation of reading a document moving on a conveyance path of a fed document by a fixed sensor) is usually a close-to-one-size sensor. This type of sensor used in-line is a type sensor in which sensor pixels for detecting a document are arranged over the entire width of the document. For this reason, since there is no black dummy pixel of the type in which the original image is formed via the other type of reduction optical system, a method of generating the reference black correction data line by line when reading the original is adopted. It cannot be taken, and a method of reading a reference plate of a reference black by a sensor or obtaining a read value of the sensor when a light source is turned off is used (for example, see Japanese Patent Application Laid-Open No. 63-18763).
As described above, conventionally, the reference black correction data is generated by reading the reference plate by the sensor or by using the read value of the sensor when the light source is turned off. Is performed separately from the process of reading the reference white plate and the original which is performed as the above process. Therefore, a dedicated signal line is required to acquire the reference black correction data, which complicates the configuration of the apparatus.
In order to solve this problem, the present applicant has previously presented Japanese Patent Application No. 2002-176308 (hereinafter referred to as a prior art). In this prior example, when a document reading start signal is generated, reference black correction data is generated with the light source turned off, then the main light source and the auxiliary light source are turned on, and the white reference plate and the document are read. An image reading apparatus provided with means for performing processing is shown. Therefore, according to this prior example, it is possible to eliminate the dedicated signal line required for acquiring the reference black correction data in the above-described conventional technology, to simplify the configuration of the device, and to reduce the cost. May be provided.
[0004]
[Problems to be solved by the invention]
However, in this prior example, the lighting operation of the main light source and the auxiliary light source to be started after the generation of the reference black correction data is performed. In the first embodiment, the lighting operation is performed only once and the white reference plate and the original are read immediately. In Example 2, the white reference plate and the original are read immediately after the actual lighting operation is performed after one preliminary lighting operation. Therefore, in the first embodiment, there is no guarantee that the light source is lit reliably, and since the starting voltage cannot be increased, a considerable time is required until the light source is stabilized. Further, in the second embodiment, the lighting of the light source is more reliably guaranteed, but since the starting voltage cannot be so high, a considerable time is required until the light source is stabilized in this example as well. For this reason, there is a concern that a reduction in the required processing time from the generation of the document reading start signal to the end of reading of the document may be an obstacle.
SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the related art and the prior art, and has as its object to provide a reference black correction after a document reading instruction is issued and a document reading start signal is generated. It is possible to further reduce the time required to complete the procedure of generating data, turning on a light source, generating reference white correction data, and reading a document, guaranteeing stable operation of the light source, and using low-cost means. An object of the present invention is to provide an image reading apparatus and an image processing apparatus (a scanner, a copying machine, a facsimile, etc.) provided with the image reading apparatus.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a sensor unit having a main light source, an auxiliary light source for promoting light emission of the main light source, a line image sensor for photoelectrically converting a target image irradiated by the main light source, and reading control for controlling operation of the sensor unit. An image reading device having a correction / conversion processing unit for correcting / converting an output image signal from an image sensor, wherein the reading control unit uses a document reading start signal to read the reference black of all lines before reading the document. After starting the reading operation for generating the correction data, and thereafter repeating the blinking operation of the main light source and the auxiliary light source, a series of controls for performing the reading operation for generating the reference white correction data and the original data are performed. This is an image reading device that is characterized by
[0006]
According to a second aspect of the present invention, in the image reading apparatus according to the first aspect, the blinking operation is performed at the time of reading when power is turned on.
[0007]
According to a third aspect of the present invention, there is provided the image reading apparatus according to the first or second aspect, further comprising an automatic document feeder for supplying the read original to the sensor unit, wherein the blinking operation is performed by the original feeder of the automatic document feeder. Documents are set on a paper tray, and this operation is performed when the tray is lifted up.
[0008]
According to a fourth aspect of the present invention, there is provided an image processing apparatus including the image reading apparatus according to any one of the first to third aspects as a part of constituent elements.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
The present invention will be described based on the following embodiments shown in the accompanying drawings.
FIG. 1 shows a schematic configuration of an image reading apparatus according to an embodiment of the present invention. Note that the image reading apparatus shown in FIG. 1 performs a reading operation in an ADF mode (also referred to as a “sheet-through mode”), that is, a line image sensor (here, etc.) in which a sheet document fed by the ADF is fixed to a transport path. It mainly shows a mechanism that enables an operation of reading by a double contact type line image sensor (CCD sensor), and a circuit configuration of a reading unit that processes an image signal read by the line image sensor (see FIGS. 2 and 3 described later) ) Is not shown.
Referring to FIG. 1, a line image sensor 103 of a close contact type (hereinafter, referred to as a “contact image sensor”) 103 is a light source that slit-exposes an original (a fluorescent light generally used as an illumination light source to be read, for example, a fluorescent light). Tube), an auxiliary light source (for example, LED), a photoelectric conversion element in which sensor pixels are arranged in a line (see CIS 103 in FIG. 2), and document transport via a 1: 1 image forming optical system such as a lens array. It is provided in such a form that it faces the road and is in close contact with the document. At a position facing the contact image sensor 103, a white plate 104 serving as a white reference is provided, and a document conveying roller is provided before and after the white plate 104. Also, the transport unit is configured so that the original placed on the original tray 102 passes over the contact image sensor 103 of the above-mentioned original reading unit, forms a transport path to the original discharge tray 106 via the transport belt 105 and the like. Constitute.
[0010]
In the present embodiment, before a document is conveyed from a tray 102 on which a document (or a bundle of documents) 101 is placed and a reading operation is performed, reference black correction data and reference black correction data are generated, and A / D conversion is performed using these data. Adjusts the dynamic range of the conversion circuit and performs shading correction.
The generation of the reference black correction data is for correcting errors due to variations in characteristics inherent to the contact image sensor 103 and variations in signal components due to dark current generated in sensor pixels. The reading of the contact image sensor 103 is performed in a state where the light is turned off, and black signals of all the sensor pixels of one line are generated. The generated data is stored as reference black correction data, and the read data is corrected when reading the document 101 (or the reference white plate 104).
In addition, the generation of the reference white correction data is based on variations in characteristics inherent in the light source built in the contact image sensor 103, variations caused by temperature and changes over time, and variations in the main scanning direction of the light source and the sensor element. A reference white plate 104 serving as a white reference is read in order to correct variations occurring in one line of sensor pixels. When reading the reference white plate 104, the gain of the variable gain amplifier in the reading unit is adjusted by adjusting the gain so that the peak value of the read output from the contact image sensor 103 becomes a predetermined target value. I have. After reading the reference white plate 104 and obtaining the reference white correction data, the original 101 is conveyed, the image data of the original is read, and the read data is corrected by the reference white correction data in the same manner as the black correction.
[0011]
FIG. 2 is a processing circuit block diagram of a reading unit of the image reading apparatus according to the embodiment of the present invention.
The processing circuit of the reading unit including the contact image sensor illustrated in FIG. 2 includes a light source 201 and a sensor 202 that photoelectrically converts an image and outputs one line as four-system signals according to a processing flow from the input side to the output side. An image sensor (CIS) 103, four-system sample / hold circuit (S / H) 203, four-system A / D conversion circuit 204, memory 205, black correction circuit 206, shading correction circuit 207, and image The processing unit 210 is connected in order to form a circuit. The reference control circuit 208 controls the reference to the A / D conversion circuit 204 and the black correction circuit 206, and the gate signal generation circuit 209 generates various control signals for controlling the light source 201, the reference control circuit 208, and the like. I do. The main body control board 501 has a circuit for controlling the entire image reading apparatus. Here, a control signal to the gate signal generation circuit 209 is input.
Referring to FIG. 2, the processing of the read image signal of the contact image sensor 103 will be described. When the reference white plate 104 and the document 101 are irradiated by the light source 201, the target images are arranged in a line by the four sensors 202. The data is read for each photoelectric conversion element (pixel). The output from each sensor 202 passes through a sample and hold circuit (S / H) 203 that samples and holds the output until the next sample, and is transmitted to Vin, which is one end of an input unit of an A / D conversion circuit 204. A reference value serving as a reference is input to Vref, which is the other input unit of the A / D conversion circuit 204, and it is determined what level the input Vin has reached with respect to the reference value. The digital value determined by the result is output from this circuit.
[0012]
The four digital outputs processed and output by the A / D conversion circuit 204 for each system are combined into one line by the memory 205, and then the black offset data previously stored in the memory by the black correction circuit 206. (Reference black correction data described later) is subtracted and transmitted to the shading correction unit 207. The shading correction unit 207 performs shading correction based on the shading correction data calculated based on the reference white data obtained when the reference white plate 104 is read, and adjusts the shading correction in a subsequent image processing unit (adapted to a device using read image data. Correction, data format conversion processing, and the like). Note that an image signal output from the sensor when the reference white plate 104 is read is subjected to the same processing as described above by this reading unit, and then stored as correction data of the shading correction unit 207. Is used in the shading correction process for
As reference black correction data stored in the black correction circuit 206, data obtained by performing the same processing as described above on an image signal output from the sensor in a state where the light source is turned off by this reading unit is used. This is used for the black correction process on the image of the reference white plate 104 and the document 101 read by scanning.
[0013]
Next, the configuration and operation of the reference control circuit 208 in the processing circuit (FIG. 2) of the reading unit will be described.
FIG. 3 is a block diagram showing the configuration of the reference control circuit (see FIG. 2) in more detail.
One end of the output of the memory unit 205 in the processing circuit of FIG. 2 is transmitted to the reference control circuit 208. As shown in FIG. 3, in the reference control circuit 208, noise is first removed from the digital image data combined in one line by the memory unit 205 by the average value circuit 301. The data from which the noise has been removed by the averaging circuit 301 is transmitted to a comparator 302, where it is compared with a preset comparison value. If it is high, Hi data is output to the next stage, and if it is low, Low data is output to the next stage. Data is output. The output data from the comparator 302 is converted into analog data by a DA conversion circuit 303a, the peak data is detected by a P / H circuit 304, and this value is converted to a reference voltage (see FIG. 2) of an A / D conversion circuit 204 (see FIG. 2). Vref).
The setting of the reference voltage (Vref) of the A / D conversion circuit 204 is changed according to the reading conditions, and three kinds of reference voltages including the above case are prepared. When using the background removal (also referred to as background removal, representing the image data with the background being the upper limit), as described above, the peak value (background value) of the read data is converted to an A / D conversion circuit. The reference voltage (Vref) 204 is used. When the background removal function is not used, predetermined data (digital voltage values) are prepared as appropriate values for the reference white plate 104 and the document 101, and are converted to analog amounts by the D / A conversion circuits 303a and 303b. Used for the reference voltage (Vref) of the D conversion circuit 204. At this time, switching of each set value is performed by WTGT (at the time of reading a reference white board), DOCGT (at the time of reading a document), and AEMODE (at the time of background removal mode) which are gate signals from the gate signal generation circuit 209 (FIG. 2). This is performed by switching the SWs 306a to 306c. Note that the above method of changing the reference voltage (Vref) of the A / D conversion circuit 204 according to the reading mode can be performed by employing an existing technology (for example, see Japanese Patent Application Laid-Open No. 9-224156). A detailed description is omitted here.
[0014]
Next, a description will be given of an embodiment relating to processing executed from the generation of a document reading start signal to the reading of a document in the above-described image reading apparatus (see FIGS.
The purpose of this embodiment is to realize this processing quickly, reliably, and at low cost. For this purpose, the processes of generating the reference black correction data, turning on the light source, generating the reference white correction data, and reading the document, which are necessary for reading the document, are performed according to a series of operation procedures. In order to surely perform the operation, the generation of the reference black correction data is started by the document reading start signal, and after the data is generated, the blinking operation of the main light source and the auxiliary light source is repeated, and then the reference white correction data and the document data are generated. Is a procedure for performing a read operation for reading.
Since the above-described processing from the start of reading a document to the actual reading of the document is performed as a series of operation procedures, when performing this operation procedure, it is possible that one control unit alone controls the operation. Being able meets the objectives of the present invention.
[0015]
FIG. 4 is a diagram illustrating a configuration of a control unit according to the present embodiment that executes processing from sheet feeding to reading of a document according to a series of operation procedures.
As shown in FIG. 4, a method is provided in which an ADF control board 502 is provided independently of the main body control board 501, and the ADF control board 502 controls the operation of the ADF and the contact image sensor 103 (including the built-in light source 201). Take. Therefore, when the power is turned on, the ADF control board 502 independently generates a reading start signal to the contact image sensor 103 irrespective of the operation of the main body control board 501, and performs the above-described series of reading operations starting from generation of the reference black correction data. It is possible to start, and the control operation can be performed simultaneously on both sides without interrupting the processing at the time of power supply startup performed by the main body control board 501, and the processing can be speeded up. Further, it is possible to solve the problem in the related art that the connection with the main body control unit becomes complicated and the number of signal lines increases.
[0016]
In addition, the lighting operation at the time of reading is performed after repeating the blinking operation of the main light source and the auxiliary light source, but by performing such an operation, it is possible to guarantee a stable operation of the illumination light source. Thus, a means suitable for the purpose of the present invention is constituted.
FIG. 5 is a diagram showing a timing chart for explaining a blinking operation of the main light source and the auxiliary light source. The operation is started in response to a reading start signal generated by the ADF control board 502. In the present embodiment, the operation is performed when the power is turned on, and the processing when the power is turned on performed by the main body control board 501 is completed (that is, the processing is actually performed). The necessary operation is executed during a preparation period until the original is read and the read image can be processed.
Referring to FIG. 5, after turning on the power, a predetermined time L1 (as described later, the reference black correction data is generated during this period L1) from a reading start signal issued by the ADF control board 502, the main light source is turned on. Light.
Here, a mode is adopted in which the auxiliary light source is simultaneously turned on at the same timing. .
[0017]
In the present invention, it is necessary to repeat the blinking. Therefore, the light source is turned off once (at this time, the reading start signal is turned off) and the reading start signal is generated again. Perform during the period. The number of times of the blinking operation may be any number as long as the time does not affect the power-on processing performed by the main body control board 501.
In this way, by providing a time period for turning on and off the light source during the preparation period before reading the reference white plate and the original, it is possible to eliminate the problem that the light source does not turn on during actual reading, and to use the auxiliary light source to prevent the main light source from being turned on. Increase the lighting time. This is because the light source is liable to be lit as the starting voltage is higher, so that the blinking operation performed in the preparation period allows the high voltage to be applied many times, and the starting voltage can be made higher during the actual reading. . The auxiliary light source is not used at the time of actual reading using the light source. At this time, only the main light source is used so that the influence of the auxiliary light source does not appear, so that high-quality read image data can be obtained. To
[0018]
FIG. 6 shows an example of a timing chart for explaining the operation of this embodiment in which the generation of the reference black correction data, the turning on of the light source, the generation of the reference white correction data, and the reading of the document are performed in a series of procedures.
The operation according to this series of procedures will be described with reference to FIG. 6. In this example, the operation is started by a reading start signal generated by the ADF control board 502. However, the timing at which the reading start signal is generated is not limited to the above-described embodiment (FIG. 5) in which the reading start signal is generated during the preparation period until the power-on processing performed by the main body control board 501 is completed. Sometimes, it may be generated at an appropriate timing.
The operation is started by the reading start signal generated by the ADF control board 502, and first, the operation of repeating the blinking of the light source is executed in the same manner as described above. In the present embodiment, the reference black correction data is generated simultaneously during the period in which the light source is repeatedly turned on and off (naturally, when the light source is turned off). That is, when a reading start signal is input, first, in order to generate data for black correction, the contact image sensor 103 reads black data for n lines during the period L1 in which the light source is not turned on. The read black data is stored as reference black correction data in a memory in the black correction circuit 206 (FIG. 2).
[0019]
After the generation of the reference black correction data, the blinking operation is repeatedly performed over a period L5 in which the main light source and the auxiliary light source are set as the light source blinking period. During the blinking period L5, when the original 101 is placed on the original tray 102 on which the originals shown in FIG. 1 are stacked, the original tray 102 is raised to the original feeding section (this is referred to as "lift-up". , FIG. 1 does not show this state), but it is possible to adopt an embodiment in which the operation is performed at a timing corresponding to this operation. Note that this blinking operation is performed only when the original is set before the reading of the original is started. That is, when the requested job is the continuous reading of a plurality of originals, two sheets are read only before the start of the reading of the first original. The form after the eyes may be omitted. If the number of times of the blinking operation is such that the first copy time does not become long, for example, the blinking operation is performed between the time when the original is fed from the original tray 102 and the time when the contact image sensor 103 reads the original. May be implemented. Further, the embodiment may be performed in such a manner that the operation is performed twice when the document tray 102 is lifted up and when the document is fed.
In FIG. 6, during the blinking operation, the auxiliary light source is turned on for the same time as the main light source, but the auxiliary light source may be turned off in a shorter time than the main light source.
[0020]
When the blinking operation of the light source is completed as described above, the document is fed and the document reading operation is started. As shown in FIG. 6, in the original reading operation, the reading start signal is input again after the light source blinking operation, and in order to generate the reference black correction data, the contact image sensor 103 uses the contact image sensor 103 during the period L1 in which the light source is not turned on. The black data for n lines is read. The read black data is stored in a memory in the black correction circuit 206 (FIG. 2). If the reference black correction data has already been generated at the time of the blinking operation of the light source, the generation of this data can be omitted here.
After the black correction data is generated, the light source (main light source and auxiliary light source) 201 is turned on, and the reading operation is started after the auxiliary light source is turned off. The reading operation is performed based on the gate signal SLEAD (signal indicating the reading range of the reference white plate 104) and SSCAN (signal indicating the reading range of the document) input from the main body control board 501 constituting the main body system. The reading operation of 101 is started. SLEAD is a signal input after the auxiliary light source is turned off. In this example, when reading the second and subsequent documents, only the reference white plate / document reading operation is performed, and the light source 201 does not blink.
Note that SHGT and SFGATE shown in FIG. 6 are control signals used for the correction operation in the shading correction circuit 207 (FIG. 2), and AEMODE, WTGT, and DOCGT are reference control signals in the reference control circuit 208 (FIGS. 2 and 3). (See FIG. 3), all of which are output from the gate signal generation circuit 209. PWIND is a signal for setting the background reading period of the document 101 in the average value circuit 301 (FIG. 3).
[0021]
Further, the image reading apparatus described in the above-described embodiment uses the read image data to be output, for example, a scanner, a copier, and a facsimile. Can be configured. When configuring image processing devices such as scanners, copiers, facsimile machines, etc., convert the read image data output from the image reading device to data suitable for use by each image processing device on the output side according to the specifications of each image processing device It is necessary to combine an image processing unit, a copying machine, and a facsimile with an image forming unit. The means used to combine each image processing apparatus with the image reading apparatus to configure each image processing apparatus can be implemented by applying existing technology.
[0022]
【The invention's effect】
(1) Effects corresponding to the first aspect of the invention
The reading control unit, which controls the operation of the sensor unit, activates the reading operation to generate the reference black correction data for all lines before reading the document based on the reading start signal, and then blinks the main light source and the auxiliary light source After the operation is repeated, a series of reading operations for performing the reading operation for generating the reference white correction data and the original data are controlled. By further shortening the time required to read the original, and by repeating the blinking operation of the light source before actually reading the reference white board and the original, stable light emission of the light source is assured. In order to generate the black correction data, a dedicated signal line as in the related art is unnecessary, and the number of connection lines can be reduced. It is possible to achieve simplification and cost reduction.
(2) Effects corresponding to the second aspect of the invention
Since the blinking operation is performed at the time of reading when the power is turned on, and the light source is stably turned on when the power is turned on, which is hardest to turn on, the effect of the above (1) can be more effectively exerted.
(3) Effects corresponding to the invention of claim 3
In addition to the effects of the above (1) and (2), the flickering operation is performed when a document is set on the document feed tray of the automatic document feeder and the tray is lifted up, so that the first copy time is extended. The light source can be stably turned on without any trouble.
(4) Effects corresponding to the invention of claim 4
The effects (1) to (3) can be realized in an image processing apparatus such as a copying machine, a facsimile, a scanner, and the above-described multifunction peripheral, or a filing apparatus that stores image data. It is possible to increase the speed and improve the performance.
[Brief description of the drawings]
FIG. 1 shows a schematic configuration of an image reading apparatus according to an embodiment of the present invention.
FIG. 2 is a processing circuit block diagram of a reading unit of the image reading apparatus according to the embodiment of the present invention.
FIG. 3 is a block diagram showing a configuration of a reference control circuit (FIG. 2) in more detail;
FIG. 4 shows a configuration of a control unit that executes a series of operation procedures from document feeding to reading.
FIG. 5 is a timing chart illustrating a blinking operation of a main light source and an auxiliary light source.
FIG. 6 shows an example of a timing chart of an operation of the present embodiment in which generation of black correction data, lighting of a light source, generation of white correction data, and reading of a document are performed in a series of procedures.
[Explanation of symbols]
101: manuscript, 102: manuscript tray,
103: contact image sensor, 104: reference white plate,
201: light source 203: sample and hold circuit (S / H)
204: A / D conversion circuit, 205: memory,
206: black correction circuit, 207: shading correction circuit,
208: Reference control circuit,
209: gate signal generation circuit 210: image processing unit
501: Main body control board, 502: ADF control board.

Claims (4)

A sensor unit having a main light source, an auxiliary light source that promotes light emission of the main light source, a line image sensor that photoelectrically converts a target image irradiated by the main light source, a reading control unit that controls operation of the sensor unit, An image reading apparatus having a correction / conversion processing unit that corrects / converts an output image signal, wherein the reading control unit is configured to generate reference black correction data for all lines prior to reading a document with a document reading start signal. An image reading apparatus, comprising: starting a reading operation, thereafter repeating a blinking operation of a main light source and an auxiliary light source, and performing a series of controls for performing a reading operation for generating reference white correction data and document data. 2. The image reading apparatus according to claim 1, wherein the blinking operation is performed at the time of reading when power is turned on. 3. The image reading apparatus according to claim 1, further comprising an automatic document feeder that supplies a read document to the sensor unit, wherein the blinking operation is performed when a document is set on a document feed tray of the automatic document feeder. An image reading apparatus that performs the operation when the tray is lifted up. An image processing device comprising the image reading device according to claim 1 as a part of a component.

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