JP2019140457A - Image reading device, image forming apparatus, and image reading method - Google Patents

Abstract

To provide an image reading device, an image forming apparatus, and an image reading method that can reduce the time from when a cover member is opened until a light emitting unit reaches a size detection position.SOLUTION: An image reading device comprises: a first reading processing section that executes first reading processing of moving a reading unit 22 in a reading direction D21 to read image data of a document placed on a document placement surface 211A; a first movement processing unit that executes first movement processing of moving the reading unit 22 to a home position P4 after the end of the first reading processing; and a second movement processing unit that can execute second movement processing of, when a cover member is opened during the execution of the first movement processing, suspending the first movement processing and moving the reading unit 22 to a size detection position P6 at which data for detection is acquired, which is used for detecting the size of the document placed on the document placement surface 211A without passing through the home position P4.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an image reading apparatus that reads image data of a document placed on a document placing surface, an image forming apparatus that includes the image reading apparatus, and an image reading method that is executed by the image reading apparatus.

  An image reading apparatus that reads image data of a document placed on a document placement surface is known. This type of image reading apparatus includes a light emitting unit that is movable in the sub-scanning direction and that emits light irradiated along the main scanning direction to the document placed on the document placement surface. When the image data of the document is read, the light emitting unit is moved from a predetermined home position in a predetermined reading direction and the light is emitted. As a result, the light applied to the document placed on the document placement surface is scanned, and image data based on the light reflected by the document is acquired.

  In this type of image reading apparatus, the size of a document placed on the document placement surface may be detected (see, for example, Patent Document 1). For example, in the image reading apparatus, when a cover member that can be opened and closed with respect to the document placement surface is opened, a predetermined size detection position at which the light emission unit can read image data of the document from the home position Moved to. Then, at the timing when the cover member is closed, the image data for one or more lines of the document placed on the document placement surface is read, and the size detection process based on the image data is executed.

JP 2012-49678 A

  By the way, in the image reading apparatus, the cover member is opened during the execution of the moving process for returning the light emitting unit to the home position, which is executed after reading the image data of the document placed on the document placement surface. Sometimes. In this case, when the light emission unit is moved to the size detection position after completion of the movement process, the light emission unit is caused to reach the size detection position before the cover member is closed. May not be able to detect the size of the document.

  An object of the present invention is to provide an image reading apparatus, an image forming apparatus, and an image reading method capable of shortening the time from when a cover member is opened until a light emission unit reaches a size detection position.

  An image reading apparatus according to an aspect of the present invention includes a cover member, a light emission unit, a first reading processing unit, a first movement processing unit, and a second movement processing unit. The cover member is provided to be openable and closable with respect to a document placement surface on which a document is placed. The light emission unit is provided so as to be movable along a first direction parallel to the document placement surface, and emits light irradiated on the document placement surface along a second direction orthogonal to the first direction. Eject. The first reading processing unit performs a first reading process of reading the image data of the document placed on the document placement surface by moving the light emission unit in the first direction. The first movement processing unit moves the light emission unit to a home position upstream of the reading range in which the light can be irradiated onto the document placement surface after the first reading processing is completed. The first movement process is executed. When the cover member is opened during the execution of the first movement process, the second movement processing unit interrupts the first movement process and places the light emission unit on the document placement surface in the reading range. It is possible to execute a second movement process in which the detection data used for detecting the size of the placed document is moved to the size detection position where the detection data is acquired without going through the home position.

  An image forming apparatus according to an aspect of the present invention includes the image reading device and an image forming unit. The image forming unit forms an image based on image data.

  An image reading method according to another aspect of the present invention includes a cover member provided to be openable and closable with respect to a document placement surface on which a document is placed, and moves along a first direction parallel to the document placement surface. A light emission unit that emits light that is radiated onto the document placement surface along a second direction orthogonal to the first direction, and that is executed by an image reading apparatus. Executing the first reading process of reading the image data of the document placed on the document placement surface by moving in the first direction; and after the first reading process, the light emission unit is moved to the document Performing a first movement process for moving the mounting surface to a home position upstream of the reading range in which the light can be irradiated, and opening the cover member during the execution of the first movement process; The first movement process is interrupted. The light emission unit is moved to the size detection position where the detection data used for detecting the size of the document placed on the document placement surface in the reading range is acquired without passing through the home position. The movement process can be executed.

  According to the present invention, an image reading apparatus, an image forming apparatus, and an image reading method capable of shortening the time from when the cover member is opened until the light emission unit reaches the size detection position are realized.

FIG. 1 is a diagram illustrating a configuration of an image forming apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram showing a system configuration of the image forming apparatus according to the embodiment of the present invention. FIG. 3 is a diagram illustrating a configuration of the ADF and the image reading unit in the image forming apparatus according to the embodiment of the present invention. FIG. 4 is a diagram illustrating a configuration of the ADF and the image reading unit in the image forming apparatus according to the embodiment of the present invention. FIG. 5 is a diagram showing a moving range of the reading unit in the image forming apparatus according to the embodiment of the present invention. FIG. 6 is a flowchart illustrating an example of a reading control process executed by the image forming apparatus according to the embodiment of the present invention. FIG. 7 is a flowchart illustrating an example of the size detection process executed by the image forming apparatus according to the embodiment of the present invention. FIG. 8 is a flowchart illustrating an example of the placement reading process executed by the image forming apparatus according to the embodiment of the present invention. FIG. 9 is a flowchart illustrating an example of the conveyance reading process executed by the image forming apparatus according to the embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.

[Schematic Configuration of Image Forming Apparatus 10]
First, a schematic configuration of an image forming apparatus 10 according to an embodiment of the present disclosure will be described with reference to FIGS. 1 and 2. Here, FIG. 1 is a cross-sectional view showing the configuration of the image forming apparatus 10.

  The image forming apparatus 10 is a multifunction machine having a plurality of functions such as a facsimile function and a copy function, as well as a scan function for reading image data from a document and a print function for forming an image based on the image data. The present invention can also be applied to image reading apparatuses or image forming apparatuses such as scanner apparatuses, facsimile apparatuses, and copiers.

  As shown in FIGS. 1 and 2, the image forming apparatus 10 includes an ADF 1, an image reading unit 2, an image forming unit 3, a paper feeding unit 4, a control unit 5, an operation display unit 7, and a storage unit 8.

  The image forming unit 3 can form an image by electrophotography based on the image data read by the image reading unit 2. The image forming unit 3 can also form an image based on image data input from an information processing apparatus such as an external personal computer. Specifically, the image forming unit 3 includes a photosensitive drum, a charging device, an optical scanning device (LSU), a developing device, a transfer roller, a cleaning device, a fixing roller, a pressure roller, and a paper discharge tray. In the image forming unit 3, an image is formed on the sheet supplied from the paper feeding unit 4, and the sheet after the image formation is discharged to the paper discharge tray. The sheet supplied from the paper supply unit 4 is a sheet material such as paper, coated paper, postcard, envelope, and OHP sheet.

  The control unit 5 includes control devices such as a CPU, a ROM, and a RAM (not shown). The CPU is a processor that executes various arithmetic processes. The ROM is a non-volatile storage device in which information such as a control program for causing the CPU to execute various processes is stored in advance. The RAM is a volatile storage device used as a temporary storage memory (working area) for various processes executed by the CPU. In the control unit 5, various control programs stored in advance in the ROM are executed by the CPU. As a result, the image forming apparatus 10 is comprehensively controlled by the control unit 5. The control unit 5 may be an electronic circuit such as an integrated circuit (ASIC), and is a control unit provided separately from the main control unit that controls the image forming apparatus 10 in an integrated manner. May be.

  The operation display unit 7 is a display unit such as a liquid crystal display that displays various types of information in response to control instructions from the control unit 5, and an operation key or touch panel that inputs various types of information to the control unit 5 in response to user operations. And so on.

  The storage unit 8 is a nonvolatile storage device. For example, the storage unit 8 is a storage device such as a flash memory and a nonvolatile memory such as an EEPROM (registered trademark), an SSD (solid state drive), or an HDD (hard disk drive).

[Configuration of ADF 1 and Image Reading Unit 2]
Next, the ADF 1 and the image reading unit 2 will be described with reference to FIGS. Here, FIG. 3 is a perspective view showing the image reading unit 2 in a state where the ADF 1 is opened. FIG. 4 is a cross-sectional view showing configurations of the ADF 1 and the image reading unit 2. FIG. 5 is a cross-sectional view showing the configuration of the image reading unit 2.

  The ADF 1 conveys the document via an irradiation position P3 (see FIG. 4) of light emitted from the reading unit 22 of the image reading unit 2.

  As shown in FIGS. 1, 2, and 4, the ADF 1 includes a document transport path 1 </ b> A, a document placement unit 11, a plurality of transport rollers 12, a document guide 13, a paper discharge unit 14, and a document sensor 15. .

  A document to be conveyed is placed on the document placement unit 11. The document sensor 15 detects the presence or absence of a document on the document placement unit 11. For example, the document sensor 15 is a reflection type optical sensor provided on the document placement unit 11. The document conveyance path 1 </ b> A is a document movement path formed between the document placement unit 11 and the paper discharge unit 14. A plurality of transport rollers 12 and a document guide 13 are provided in the document transport path 1A. Each of the transport rollers 12 is rotated by a rotational driving force supplied from a motor (not shown), and thereby transports the document placed on the document placement unit 11 to the paper discharge unit 14. The document guide 13 guides the document conveyed by the conveyance roller 12 to the irradiation position P3.

  The image reading unit 2 can read image data from a document.

  As shown in FIGS. 1 and 2, the image reading unit 2 includes a housing 21, a reading unit 22, a mirror 23, a mirror 24, an optical lens 25, a CCD 26, an AFE circuit 27, an image processing unit 28, and a driving unit 29. Is provided.

  The housing 21 accommodates the components of the image reading unit 2. The upper surface of the housing 21 is used as a document table on which a document is placed. Specifically, as shown in FIG. 3, a first opening 21 </ b> A that forms a rectangular opening is provided on the upper surface of the housing 21. A first contact glass 211 is attached below the first opening 21A. The opening of the first opening 21 </ b> A is closed by the first contact glass 211. A part of the upper surface of the first contact glass 211 is exposed from the first opening 21A. An exposed area on the upper surface of the first contact glass 211 is a document placement surface 211A (see FIG. 3) on which a document is placed. In the image forming apparatus 10, a document is placed in accordance with a predetermined reference position P1 (see FIG. 3) on the document placement surface 211A.

  The ADF 1 also serves as a document cover for the document placed on the document placement surface 211A. Specifically, the ADF 1 is supported by the casing 21 so as to be openable and closable with respect to the document placement surface 211A. Here, the ADF 1 is an example of the cover member according to the present invention, and is an example of the document conveying portion according to the present invention.

  As shown in FIG. 3, a second opening 21 </ b> B that forms a rectangular opening is provided on the upper surface of the housing 21 separately from the first opening 21 </ b> A. The second opening 21B is provided on the upper surface of the housing 21 at a position facing the document guide 13 of the ADF 1 in a state of being closed with respect to the document placement surface 211A. A second contact glass 212 is attached below the second opening 21B. The opening of the second opening 21 </ b> B is closed by the second contact glass 212. A part of the upper surface of the second contact glass 212 is exposed from the second opening 21B. The irradiation position P <b> 3 (see FIG. 4) is a position on the exposed region on the upper surface of the second contact glass 212.

  As shown in FIG. 3, an open / close sensor 213 is provided on the upper surface of the housing 21. The open / close sensor 213 is used to detect the state transition of the ADF 1 from the closed state to the open state and the state transition from the open state to the closed state with respect to the document placement surface 211A. For example, the open / close sensor 213 is a reflective optical sensor.

  As shown in FIG. 2, the image reading unit 2 is provided with a document sensor 214. The document sensor 214 detects the presence or absence of a document at a predetermined detection position P2 (see FIG. 3) on the document placement surface 211A. For example, the detection position P2 is a position on the inner side of the A3 horizontal document placed on the document placement surface 211A in accordance with the reference position P1, and is placed on the document placement surface 211A in accordance with the reference position P1. This is the position outside the placed A4 vertical document. For example, the document sensor 214 is a reflective optical sensor provided below the document placement surface 211A.

  As shown in FIG. 5, a color reference plate 215 is provided between the first opening 21A and the second opening 21B. As shown in FIGS. 4 and 5, the color reference plate 215 is provided on the upper surface of the first contact glass 211. The color reference plate 215 has a predetermined reference image on the surface facing the first contact glass 211. For example, the reference image is a solid image having a predetermined reference density corresponding to white. From the color reference plate 215, color reference data used for shading correction described later is read.

  As shown in FIG. 1, the reading unit 22 includes a light source 221 and a mirror 222. The light source 221 is a plurality of white LEDs arranged along the main scanning direction D1 (see FIG. 3) parallel to the document placement surface 211A. The light source 221 emits light irradiated along the main scanning direction D <b> 1 on the document placement surface 211 </ b> A or the upper surface of the second contact glass 212. The light emitted from the light source 221 passes through the first contact glass 211 or the second contact glass 212 and is applied to the document placed on the first contact glass 211 or the document conveyed by the ADF 1. The mirror 222 reflects the light emitted from the light source 221 and reflected by the document to the mirror 23. Here, the reading unit 22 is an example of a light emitting unit in the present invention. The main scanning direction D1 is an example of the second direction in the present invention.

  The reading unit 22 is supported by the housing 21 so as to be movable along the sub-scanning direction D2 (see FIG. 3) parallel to the document placement surface 211A and orthogonal to the main scanning direction D1. Yes. Specifically, the reading unit 22 can move between one end position and the other end position in the sub-scanning direction D2 inside the housing 21. Here, FIG. 5 shows a movable range R <b> 10 of the reading unit 22 inside the housing 21. In FIG. 5, the movable range of the reading unit 22 when the position of the light source 221 is regarded as the position of the reading unit 22 in the housing 21 is indicated by reference numeral R <b> 10.

  In the image forming apparatus 10, any one of a first reading process for reading image data of a document placed on the document placement surface 211 </ b> A and a second reading process for reading image data of a document conveyed by the ADF 1 is executed. Thus, the image data of the original is read. The reading unit 22 is disposed at the home position P4 (see FIG. 5) while waiting for an input of an execution instruction for either the first reading process or the second reading process in the image forming apparatus 10. Here, in the home position P4, the reading unit 22 moves when the first reading process is performed, rather than the reading range R11 (see FIG. 5) in which the light emitted from the light source 221 can be irradiated onto the document placement surface 211A. This is the upstream position in the reading direction D21 (see FIG. 5). Further, the home position P4 is a position where the color reference plate 215 can be irradiated with light emitted from the light source 221 as shown in FIG.

  The driving unit 29 generates a driving force for the reading unit 22 to move in the housing 21. Specifically, the drive unit 29 is a stepping motor.

  The reading unit 22 receives a driving force supplied from the driving unit 29 via a power transmission mechanism (not shown) and moves in the housing 21 along the sub-scanning direction D2. Specifically, when the first reading process is executed, the reading unit 22 is moved from the home position P4 (see FIG. 5) in the reading direction D21 (see FIG. 5) along the sub-scanning direction D2. Thereby, the image reading unit 2 scans the light emitted from the light source 221 and applied to the original placed on the original placement surface 211A in the reading direction D21, and based on the light reflected by the original. It is possible to read the image data of the document. Further, the reading unit 22 is moved from the home position P4 to the reading position P5 (see FIG. 5) when the second reading process is executed. Here, the reading position P5 is a position upstream of the home position P4 in the reading direction D21, and the light emitted from the light source 221 is irradiated to the irradiation position P3 (see FIG. 4) on the second contact glass 212. This is a possible position. Thereby, the image reading unit 2 can read the image data of the document based on the light reflected by the document conveyed by the ADF 1 at the irradiation position P3. Here, the reading direction D21 is an example of the first direction in the present invention.

  The mirror 23 reflects the light incident from the mirror 222 of the reading unit 22 toward the mirror 24. The mirror 24 reflects the light incident from the mirror 23 toward the optical lens 25. The optical lens 25 collects the light incident from the mirror 24 and causes the light to enter the CCD 26.

  The CCD 26 is an image sensor having a plurality of photoelectric conversion elements arranged along the main scanning direction D1. The CCD 26 outputs an electrical signal corresponding to the amount of received light. In the image reading unit 2, the light emitted from the light source 221 and reflected by the document enters the CCD 26 via the mirror 222, the mirror 23, the mirror 24, and the optical lens 25. As a result, an analog electrical signal corresponding to the image of the document is output from the CCD 26. An analog electrical signal output from the CCD 26 is input to an AFE (analog front end) circuit 27.

  The AFE circuit 27 is an electronic circuit that executes processing based on an analog signal input from the CCD 26. For example, in the AFE circuit 27, an analog signal input from the CCD 26 is clamped with a line period and then amplified. The amplified analog signal is converted into digital signal image data by an analog-digital converter. The image data output from the AFE circuit 27 is input to the image processing unit 28.

  The image processing unit 28 performs shading correction for correcting image data input from the AFE circuit 27 based on the color reference data acquired from the color reference plate 215. The image processing unit 28 is configured by an electronic circuit such as an ASIC. The control unit 5 may function as the image processing unit 28 by executing a program stored in the ROM using the CPU.

  In the image reading unit 2, there may be a variation in the light emission characteristics of the light source 221 or a variation in the light receiving sensitivity of the CCD 26 in the main scanning direction D1. In this case, when an image having the same density (for example, a white image) is read by the image reading unit 2, there is a possibility that a reading error occurs in the image data of the pixels in the main scanning direction D1. The shading correction is image processing for correcting the reading error in the image reading unit 2 and suppressing density variation.

  For example, the image processing unit 28 performs the shading correction for each pixel of the read image data based on the following equation (1). Here, the density value of the black level in the equation (1) is the density value of the pixel indicating black. The black level density value may be a predetermined fixed value, or based on outputs from the CCD 26 and the AFE circuit 27 when the ADF 1 is closed and the light source 221 is turned off. It may be set. In the image forming apparatus 10, the relationship between the pixel density and the pixel density value is defined so that the density value of the pixel increases as the pixel density decreases.

  Density value of image data after correction = number of gradations × (density value of image data before correction−density value of black level) / (density value of color reference data−density value of black level) (1)

  The image data subjected to the shading correction by the image processing unit 28 is stored in the storage unit 8.

  Here, in the image forming apparatus 10, when the first reading process is executed, the size of the document placed on the document placement surface 211A is detected before the first reading process is executed.

  Specifically, in the image forming apparatus 10, when the open / close sensor 213 detects a state transition from the closed state to the open state of the ADF 1, the reading unit 22 is detected from the home position P 4 to a predetermined size detection position P 6 (see FIG. 5). Here, the size detection position P6 is a specific range in which the light of the light source 221 can be irradiated onto the specific original X1 (see FIG. 3) having a predetermined size placed on the original placement surface 211A in accordance with the reference position P1. This is the position in R12 (see FIG. 5). Specifically, the specific original X1 is a minimum-size original that can be detected by the image forming apparatus 10. In FIG. 3, the specific document X1 placed on the document placement surface 211A in alignment with the reference position P1 is indicated by a two-dot chain line. Further, the method for determining the size detection position P6 may be different from that described above.

  After the reading unit 22 is moved to the size detection position P6, when the open / close sensor 213 detects a state transition from the open state to the closed state of the ADF 1, the control unit 5 detects the data used for detecting the size of the document. To get. Specifically, the control unit 5 causes the light source 221 of the reading unit 22 to emit light, and the image reading unit 2 corresponds to one or more lines in the main scanning direction D1 of the document placed on the document placement surface 211A. Image data (the detection data) is read. The control unit 5 sets the size of the document based on the length of the document in the main scanning direction D1 specified based on the acquired detection data and the detection result of the document at the detection position P2 by the document sensor 214. To detect. The detected size of the document is used for determining the moving distance of the reading unit 22 when the first reading process is executed.

  By the way, in the image forming apparatus 10, the ADF 1 may be opened during the execution of the first movement process for returning the reading unit 22 executed after the first reading process to the home position P4. In this case, when the reading unit 22 is moved to the size detection position P6 after the end of the first movement process, the reading unit 22 can reach the size detection position P6 until the ADF 1 is closed. Therefore, the document size may not be detected.

  On the other hand, in the image forming apparatus 10 according to the embodiment of the present invention, as will be described below, it is possible to shorten the time from when the ADF 1 is opened until the reading unit 22 reaches the size detection position P6. It is.

  Specifically, the ROM of the control unit 5 stores in advance a reading control program for causing the CPU to execute a reading control process (see a flowchart of FIG. 6) described later. The reading control program may be recorded on a computer-readable recording medium such as a CD, a DVD, or a flash memory, and read from the recording medium and installed in the storage unit 8.

  Then, as shown in FIG. 2, the control unit 5 includes a first reading processing unit 51, a first movement processing unit 52, a first acquisition processing unit 53, a second movement processing unit 54, a third movement processing unit 55, A data acquisition unit 56, a setting processing unit 57, a second reading processing unit 58, a second acquisition processing unit 59, and a fourth movement processing unit 60 are included. Specifically, the control unit 5 executes the reading control program stored in the ROM using the CPU. Thereby, the control unit 5 includes the first reading processing unit 51, the first movement processing unit 52, the first acquisition processing unit 53, the second movement processing unit 54, the third movement processing unit 55, the data acquisition unit 56, and the setting process. Functions as a unit 57, a second reading processing unit 58, a second acquisition processing unit 59, and a fourth movement processing unit 60. Here, the apparatus including the image reading unit 2 and the control unit 5 is an example of the image reading apparatus according to the present invention.

  The first reading processing unit 51 moves the reading unit 22 from the home position P4 in the reading direction D21, and executes the first reading process for reading the image data of the document placed on the document placement surface 211A.

  Specifically, the first reading processing unit 51 indicates that there is a document on the document placement unit 11 by the document sensor 15 of the ADF 1 when an instruction to read the image data of the document is given by a user operation on the operation display unit 7. If not detected, the first reading process is executed.

  Here, the procedure of the first reading process will be described. In the first reading process, first, the color reference data is acquired from the color reference plate 215. For example, the first reading processing unit 51 causes the light source 221 of the reading unit 22 disposed at the home position P4 to emit light, and causes the AFE circuit 27 to output image data for one line of the color reference plate 215. Then, the first reading processing unit 51 causes the image processing unit 28 to set the image data for one line of the color reference plate 215 output from the AFE circuit 27 as the color reference data. For example, the image processing unit 28 is provided with a register (not shown) used for setting the color reference data. The image processing unit 28 sets the color reference data by storing the acquired color reference data in the register.

  Next, in the first reading process, the moving distance of the reading unit 22 from the home position P4 is determined. Specifically, the first reading processing unit 51 determines the moving distance from the home position P4 of the reading unit 22 based on the size of the document detected before the execution of the first reading process. Note that the image forming apparatus 10 may not be able to detect the size of the document before the first reading process is performed as described above. In this case, the first reading processing unit 51 determines the moving distance of the reading unit 22 from the home position P4 based on the last detected size of the document.

  In the first reading process, the movement of the reading unit 22 is controlled based on the determined moving distance, and image data is read from the document placed on the document placement surface 211A. For example, the first reading processing unit 51 inputs the number of driving pulses corresponding to the determined moving distance to the driving unit 29, thereby moving the reading unit 22 by the determined moving distance from the home position P4. The first reading processing unit 51 causes the light source 221 to emit light while the reading unit 22 is moving, and causes the CCD 26, the AFE circuit 27, and the image processing unit 28 to output image data based on reflected light from the document. . Here, the image processing unit 28 outputs the image data after the shading correction based on the color reference data set immediately before.

  In addition, when acquiring the color reference data, the first reading processing unit 51 causes the light source 221 to emit light and scan the light of the light source 221 irradiated to the color reference plate 215 in the sub-scanning direction D2. The AFE circuit 27 may output image data for a plurality of lines of the color reference plate 215. The first reading processing unit 51 may cause the image processing unit 28 to set an average value of the image data for a plurality of lines of the color reference plate 215 output from the AFE circuit 27 as the color reference data.

  The first movement processing unit 52 executes the first movement process for moving the reading unit 22 to the home position P4 after the end of the first reading process.

  For example, in the first movement process, after the end of the first reading process, after the waiting time corresponding to the size of the reading direction D21 in the document in which the image data is read in the first reading process, the home position P4 is reached. The movement of the reading unit 22 is started.

  For example, in the image forming apparatus 10, table data indicating the correspondence between the size of the document placed on the document placement surface 211 </ b> A in the reading direction D <b> 21 and the waiting time is stored in the storage unit 8 in advance. In the table data, the correspondence relationship between the size and the waiting time is determined so that the waiting time becomes longer as the size in the document reading direction D21 is smaller.

  When the size of the document is detected before the first reading process is performed, the first movement processing unit 52 determines the waiting time corresponding to the size based on the detected size of the document and the table data. To get. In addition, if the size of the document is not detected before the first reading process is performed, the first movement processing unit 52 responds to the size based on the last detected size of the document and the table data. The waiting time to be acquired is acquired.

  Then, the first movement processing unit 52 starts the movement of the reading unit 22 to the home position P4 after the acquired waiting time has elapsed since the end of the first reading process. For example, the first movement processing unit 52 inputs the same number of driving pulses as the number of driving pulses input to the driving unit 29 in the first reading process, and moves the reading unit 22 to the home position P4. Let

  Note that the first movement processing unit 52 may start the movement of the reading unit 22 immediately after the end of the first reading process.

  The first acquisition processing unit 53 executes a first acquisition process of acquiring the color reference data using the reading unit 22 after the first movement process is completed. Note that the method of acquiring the color reference data in the first acquisition process is the same as that in the first reading process, and thus the description thereof is omitted.

  When the ADF 1 is opened during the execution of the first movement process, the second movement processing unit 54 interrupts the first movement process and passes the reading unit 22 to the size detection position P6 via the home position P4. It is possible to execute the second movement process of moving without any movement.

  Specifically, the second movement processing unit 54 is configured to perform the first movement when the double-sided reading mode described later is set by the setting processing unit 57 and the image data on both sides of the document has been read. The process is interrupted and the second movement process is executed. Further, when the double-sided reading mode is not set, the second movement processing unit 54 interrupts the first movement process and executes the second movement process. On the other hand, the second movement processing unit 54 performs the first movement process when the double-sided reading mode described later is set by the setting processing unit 57 and the image data on both sides of the document has not been read. The second movement process is not executed without interruption.

  For example, the second movement processing unit 54 is downstream from the home position P4 in the reading direction D21 when the open / close sensor 213 detects a state transition from the closed state to the open state during the execution of the first movement process. It is determined whether the reading unit 22 can be stopped on the side. For example, can the second movement processing unit 54 be able to stop the reading unit 22 on the downstream side in the reading direction D21 from the home position P4 based on the number of driving pulses input to the driving unit 29 in the first movement processing? Judge whether or not.

  When the second movement processing unit 54 determines that the reading unit 22 can be stopped at the downstream side in the reading direction D21 from the home position P4, the second movement processing unit 54 controls the movement of the reading unit 22 to stop at the home position P4. On the other hand, when the second movement processing unit 54 determines that the reading unit 22 cannot be stopped downstream of the home position P4 in the reading direction D21, the second movement processing unit 54 temporarily stops the reading unit 22 and moves the reading unit 22 from the stop position to the home position. Move to position P4.

  The third movement processing unit 55 performs a third movement process for interrupting the first acquisition process and moving the reading unit 22 to the size detection position P6 when the ADF 1 is opened during the execution of the first acquisition process. Run.

  For example, the third movement processing unit 55 inputs the number of drive pulses corresponding to the distance from the home position P4 to the size detection position P6 to the drive unit 29, thereby moving the reading unit 22 from the home position P4 to the size detection position P6. Move to.

  Note that the control unit 5 may not include the first acquisition processing unit 53 and the third movement processing unit 55.

  The data acquisition unit 56 acquires the detection data using the reading unit 22 when the ADF 1 is closed and the reading unit 22 is present within the specific range R12 (see FIG. 5).

  Specifically, the data acquisition unit 56 uses the reading unit 22 to detect the detection data when the ADF 1 is closed after the second movement process is started and the reading unit 22 is within the specific range R12. To get. The data acquisition unit 56 uses the reading unit 22 when the reading unit 22 is within the specific range R12 when the ADF 1 is closed after the execution of the third movement process or the fourth movement process described later. To obtain the detection data. In addition, the data acquisition unit 56 determines that the reading unit 22 is within the specific range R12 when the ADF 1 is closed after the movement of the reading unit 22 from the home position P4 to the size detection position P6 before the first reading process is performed. In the case where the data exists, the reading unit 22 is used to acquire the detection data.

  For example, the data acquisition unit 56 determines that the reading unit 22 is in the specific range R12 when the open / close sensor 213 detects a state transition from the open state to the closed state of the ADF 1 during the movement of the reading unit 22 to the size detection position P6. It is judged whether it exists in. For example, the data acquisition unit 56 determines whether or not the reading unit 22 exists within the specific range R12 based on the number of driving pulses input to the driving unit 29.

  When the data acquisition unit 56 determines that the reading unit 22 is within the specific range R12, the data acquisition unit 56 causes the light source 221 to emit light and cause the image reading unit 2 to acquire the detection data. On the other hand, when the data acquisition unit 56 determines that the reading unit 22 does not exist within the specific range R12, the data acquisition unit 56 does not cause the image reading unit 2 to acquire the detection data.

  The data acquisition unit 56 causes the light source 221 to emit light when the open / close sensor 213 detects a state transition from the open state to the closed state after the reading unit 22 moves to the size detection position P6. Then, the image reading unit 2 is made to acquire the detection data.

  The data acquisition unit 56 may acquire the detection data using the reading unit 22 only when the reading unit 22 is arranged at the size detection position P6 when the ADF 1 is closed. The data acquisition unit 56 may acquire the detection data using the reading unit 22 regardless of the current position of the reading unit 22 when the ADF 1 is closed.

  The setting processing unit 57 sets a double-sided reading mode for reading image data on both sides of a document placed on the document placement surface 211A in accordance with a predetermined user operation.

  For example, the setting processing unit 57 causes the operation display unit 7 to display a reading mode setting screen used for setting the double-sided reading mode in accordance with a user operation on the operation display unit 7. Then, the setting processing unit 57 sets validity or invalidity of the double-sided reading mode in accordance with a user operation on the reading mode setting screen.

  In the image forming apparatus 10, when the double-sided reading mode is set to be effective, two image data read in each of the first reading processes that are sequentially executed are the first side and the first side of the document. The data is stored in the storage unit 8 as a set of image data corresponding to each of the two surfaces. For example, in the image forming apparatus 10, when the double-sided reading mode is set to be effective, the image data of the original read by the first reading process is stored in a predetermined single-sided storage area of the storage unit 8. The Further, in the image forming apparatus 10, when image data is stored in the one-side storage area, the image data read in the first reading process executed next and the image stored in the one-side storage area are stored. Data is stored as a set of image data in a storage area different from the one-side storage area of the storage unit 8.

  Note that the control unit 5 may not include the setting processing unit 57. In this case, when the ADF 1 is opened during execution of the first movement process, the second movement processing unit 54 may always interrupt the first movement process and execute the second movement process.

  The second reading processing unit 58 moves the reading unit 22 to the reading position P5, and executes a second reading process for reading the image data of the document conveyed by the ADF1.

  Specifically, the second reading processing unit 58 indicates that the document is present on the document placement unit 11 by the document sensor 15 of the ADF 1 when the reading of the image data of the document is instructed by a user operation on the operation display unit 7. If it is detected, the second reading process is executed.

  Here, the procedure of the second reading process will be described. First, in the second reading process, the color reference data is acquired from the color reference plate 215 as in the first reading process. The image processing unit 28 sets the color reference data by storing the acquired color reference data in the register.

  Next, in the second reading process, the reading unit 22 is moved from the home position P4 to the reading position P5. For example, the second reading processing unit 58 inputs the number of drive pulses corresponding to the distance from the home position P4 to the reading position P5 to the driving unit 29, thereby moving the reading unit 22 from the home position P4 to the reading position P5. Let

  In the second reading process, the original is conveyed by the ADF 1 and image data is read from the original conveyed by the ADF 1. Specifically, the second reading processing unit 58 causes the light source 221 to emit light, and causes the CCD 26, the AFE circuit 27, and the image processing unit 28 to output image data based on reflected light from the document. Here, the image processing unit 28 outputs the image data after the shading correction based on the color reference data set immediately before.

  The second acquisition processing unit 59 moves the reading unit 22 to the home position P4 after the end of the second reading process, and executes a second acquisition process for acquiring the color reference data using the reading unit 22. Note that the method of acquiring the color reference data in the second acquisition process is the same as that in the first reading process, and thus the description thereof is omitted.

  When the ADF 1 is opened during the execution of the second acquisition process, the fourth movement processing unit 60 interrupts the second acquisition process and moves the reading unit 22 to the size detection position P6. Run.

  For example, the fourth movement processing unit 60 inputs the number of drive pulses corresponding to the distance from the home position P4 to the size detection position P6 to the drive unit 29, thereby moving the reading unit 22 from the home position P4 to the size detection position P6. Move to.

  Note that the control unit 5 may not include the second acquisition processing unit 59 and the fourth movement processing unit 60.

[Reading control processing]
Hereinafter, an example of the procedure of the image reading method according to the present invention will be described together with the procedure of the reading control process executed by the control unit 5 in the image forming apparatus 10 with reference to FIG. Here, steps S11, S12,... Represent the numbers of processing procedures (steps) executed by the control unit 5.

<Step S11>
First, in step S <b> 11, the control unit 5 determines whether reading of image data of a document is instructed by a user operation on the operation display unit 7.

  Here, when the control unit 5 determines that reading of the image data of the document is instructed (Yes side of S11), the process proceeds to step S111. If the reading of the image data of the document is not instructed (No in S11), the control unit 5 shifts the process to step S12.

<Step S12>
In step S12, the control unit 5 determines whether or not the ADF 1 is opened with respect to the document placement surface 211A.

  Here, if the control part 5 judges that ADF1 was opened (Yes side of S12), it will transfer a process to step S13. If ADF1 is not open (No in S12), control unit 5 shifts the process to step S11 and waits for an instruction to read document image data or for opening ADF1.

<Step S13>
In step S <b> 13, the control unit 5 sets the double-sided reading mode to be valid, and after reading the image data on the first side of the document and before reading the image data on the second side of the document. Determine whether or not.

  For example, when image data is stored in the one-side storage area of the storage unit 8, the control unit 5 reads the image data on the first side of the document and reads the image data on the second side of the document. Judge that it is before reading.

  If the control unit 5 determines that the double-sided reading mode is set to be valid and before reading the image data of the second side of the document (Yes in S13), the process proceeds to step S11. Let If the duplex scanning mode is set to invalid or the duplex scanning mode is set to valid and the image data on the second side of the document is not read (No in S13), control is performed. The unit 5 shifts the process to step S14.

  If it is before reading the image data on the second side of the document, the size of the document read in the first reading process next is the same as the size of the document read immediately before. Therefore, in the reading control process, when the double-sided reading mode is set to be effective and the image data on the second side of the original is not read, the next reading of the original to be read in the first reading process is performed. The processing of step S14 and step S15 for detecting the size is avoided.

<Step S14>
In step S14, the control unit 5 moves the reading unit 22 from the home position P4 to the size detection position P6. Note that the processing in the following step S15 is executed in parallel with the movement of the reading unit 22.

<Step S15>
In step S15, the control unit 5 performs a size detection process described later.

<Step S111>
In step S <b> 111, the control unit 5 determines whether a document is placed on the document placement unit 11 of the ADF 1.

  If the control unit 5 determines that a document is placed on the document placement unit 11 (Yes in S111), the control unit 5 shifts the process to step S113. If no document is placed on the document placement unit 11 (No side in S111), the control unit 5 shifts the process to step S112.

<Step S112>
In step S112, the control unit 5 executes a placement reading process to be described later.

<Step S113>
In step S113, the control unit 5 executes a conveyance reading process to be described later.

[Size detection processing]
Next, an example of the procedure of the size detection process executed in step S15 of the reading control process will be described with reference to FIG. As will be described later, the size detection process is also executed in steps S333 and S372 of the above-described reading process and in step S432 of the conveyance reading process.

<Step S21>
First, in step S21, the control unit 5 determines whether or not the ADF 1 is closed with respect to the document placement surface 211A.

  Here, if the control part 5 judges that ADF1 was closed (Yes side of S21), it will transfer a process to step S22. If ADF1 is not closed (No in S21), control unit 5 waits for ADF1 to be closed in step S21.

<Step S22>
In step S22, the control unit 5 determines whether or not the reading unit 22 exists within the specific range R12 (see FIG. 5).

  Here, if the control unit 5 determines that the reading unit 22 is present within the specific range R12 (Yes side of S22), the control unit 5 shifts the processing to step S23. If the reading unit 22 does not exist within the specific range R12 (No side in S22), the control unit 5 ends the size detection process.

<Step S23>
In step S <b> 23, the control unit 5 acquires the detection data using the reading unit 22. Here, the processing of step S22 and step S23 is executed by the data acquisition unit 56 of the control unit 5.

<Step S24>
In step S24, the control unit 5 detects the size of the document placed on the document placement surface 211A based on the detection data acquired in step S23.

  Here, in the size detection process, when the reading unit 22 exists in the specific range R12 when the ADF 1 is closed, the size of the document is set even if the reading unit 22 does not reach the size detection position P6. Detected. As a result, the first reading process is executed in a state where the size of the document is not detected, as compared with the configuration in which the size of the document is detected only when the reading unit 22 has reached the size detection position P6. It is possible to suppress the occurrence of the situation.

  In the image forming apparatus 10, the specific range R <b> 12 is defined based on a specific document X <b> 1 having a minimum size that can be detected by the image forming apparatus 10 placed in accordance with the reference position P <b> 1. Therefore, in the image forming apparatus 10, the size of the document is erroneously detected as long as the document whose size can be detected is placed in accordance with the reference position P1 and the reading unit 22 exists in the specific range R12. There is nothing to do.

<Step S25>
In step S25, the control unit 5 moves the reading unit 22 from the size detection position P6 to the home position P4.

[Place reading process]
Next, an example of the procedure of the placement reading process executed in step S112 of the reading control process will be described with reference to FIG.

<Step S31>
First, in step S31, the control unit 5 executes the first reading process. Here, the process of step S <b> 31 is executed by the first reading processing unit 51 of the control unit 5.

  In the first reading process, first, the color reference data is acquired from the color reference plate 215. The image processing unit 28 sets the color reference data by storing the acquired color reference data in the register.

  Next, in the first reading process, the moving distance of the reading unit 22 from the home position P4 is determined. Specifically, when the size of the document is detected in the size detection process performed before the execution of the first reading process, the control unit 5 determines whether the reading unit 22 is based on the detected size of the document. The moving distance from the home position P4 is determined. In addition, when the size of the document is not detected in the size detection process executed before the first reading process, the control unit 5 reads the reading unit 22 based on the size of the document detected last. The moving distance from the home position P4 is determined.

  In the first reading process, the movement of the reading unit 22 is controlled based on the determined moving distance, and image data is read from the document placed on the document placement surface 211A. Here, the image processing unit 28 outputs the image data after the shading correction based on the color reference data set immediately before.

  Here, when the double-sided reading mode is set to be effective and no image data is stored in the single-sided storage area of the storage unit 8, the control unit 5 displays the read image data in the single-sided storage area. To store. Further, when the duplex reading mode is set to be effective and image data is stored in the single-side storage area of the storage unit 8, the control unit 5 reads the read image data and the single-side storage area. The stored image data is stored as a set of image data in a storage area different from the one-side storage area of the storage unit 8.

<Step S32>
In step S32, the controller 5 executes the first movement process. Here, the process of step S <b> 32 is executed by the first movement processing unit 52 of the control unit 5. Note that the following processing of step S33 and step S34 is executed during execution of the first movement processing.

  For example, when the size of the document is detected in the size detection process performed before the execution of the first reading process, the control unit 5 performs the processing based on the detected document size and the table data. The waiting time corresponding to the size is acquired. Further, when the size of the document is not detected in the size detection process executed before the first reading process, the control unit 5 is based on the last detected size of the document and the table data. The waiting time corresponding to the size is acquired.

  Then, the control unit 5 starts the movement of the reading unit 22 to the home position P4 after the acquired standby time has elapsed from the end of the first reading process executed in step S31.

  When the reading unit 22 is moved to the size detection position P6 via the home position P4, the reading unit 22 is moved to the size detection position P6 without passing through the home position P4 due to the interruption of the first movement process. Compared to the case where the reading unit 22 is moved, the moving distance of the reading unit 22 becomes unnecessarily long. Further, the smaller the size of the document read in the first reading process, the shorter the distance between the position of the reading unit 22 and the home position P4 at the end of the first reading process. There are many cases of going through P4. Therefore, in the image forming apparatus 10, the correspondence between the size and the waiting time is determined so that the waiting time becomes longer as the size in the document reading direction D21 is smaller. Thereby, useless movement of the reading unit 22 can be suppressed.

<Step S33>
In step S33, the control unit 5 determines whether or not the ADF 1 is opened with respect to the document placement surface 211A, similarly to step S12 of the reading control process.

  Here, if the control part 5 judges that ADF1 was opened (Yes side of S33), it will transfer a process to step S331. If ADF1 is not opened (No side in S33), the control unit 5 shifts the process to step S34.

<Step S34>
In step S34, the control unit 5 determines whether or not the first movement process is finished.

  Here, if the control part 5 judges that the said 1st movement process was complete | finished (Yes side of S34), it will transfer a process to step S35. If the first movement process is not completed (No in S34), the control unit 5 shifts the process to step S33 and waits for the completion of the first movement process or the opening of ADF1.

<Step S331>
In step S331, as in step S13 of the reading control process, the control unit 5 sets the double-sided reading mode to be valid, and after reading the image data on the first side of the document, It is determined whether or not the image data of the second surface is before being read.

  Here, when the control unit 5 determines that the duplex reading mode is set to be valid and before reading the image data of the second side of the document (Yes side of S331), the control unit 5 performs the above-described reading process. Terminate. If the duplex scanning mode is set to invalid or the duplex scanning mode is set to valid and the image data on the second side of the document is not read (No in S331), control is performed. The unit 5 shifts the process to step S332.

  If it is before reading the image data on the second side of the document, the size of the document read in the first reading process next is the same as the size of the document read immediately before. Therefore, in the above-described reading process, when the duplex reading mode is set to be effective and the image data on the second side of the document is not read, the document to be read next in the first reading process. The process of step S332 and step S333 for detecting the size of is avoided.

<Step S332>
In step S332, the control unit 5 interrupts the first movement process and executes the second movement process. Here, the process of step S <b> 332 is executed by the second movement processing unit 54 of the control unit 5.

  As a result, in comparison with the configuration in which the reading unit 22 is moved to the size detection position P6 after the completion of the first movement process, the reading unit 22 reaches the size detection position P6 after the ADF 1 is opened. It is possible to shorten the time.

<Step S333>
In step S333, the control unit 5 executes the size detection process.

<Step S35>
In step S35, as in step S331, the control unit 5 sets the double-sided reading mode to be valid, and after reading the image data on the first side of the document, the image on the second side of the document. It is determined whether or not it is before reading data.

  If the controller 5 determines that the double-sided reading mode is set to be valid and before reading the image data of the second side of the document (Yes side of S35), the controller 5 performs the above-described reading process. Terminate. If the duplex scanning mode is set to invalid or the duplex scanning mode is set to valid and the image data of the second side of the document is not read (No side in S35), the control is performed. The unit 5 moves the process to step S36.

  If it is before reading the image data on the second side of the document, the size of the document read in the first reading process next is the same as the size of the document read immediately before. Therefore, in the above-described reading process, when the duplex reading mode is set to be effective and the image data on the second side of the document is not read, the document to be read next in the first reading process. The process of step S36, step S37, step S38, step S371, and step S372 for detecting the size of each is avoided.

<Step S36>
In step S36, the control unit 5 executes the first acquisition process. Here, the process of step S <b> 36 is executed by the first acquisition processing unit 53 of the control unit 5. It should be noted that the following processes in step S37 and step S38 are performed during the execution of the first acquisition process.

  The color reference data acquired by the first acquisition process is used for the shading correction performed on the detection data acquired before the next first reading process.

  If it is determined in step S33 that the ADF 1 has been opened (Yes in S33), the color reference data acquired in step S31 is replaced with the color reference data acquired in the first acquisition process. , And used for the shading correction performed on the detection data. Further, when the process of step S371 described later is executed and the first acquisition process is interrupted, the color reference acquired in step S31 is used instead of the color reference data acquired by the first acquisition process. Data is used for the shading correction performed on the detection data. In these cases, the accuracy of the shading correction performed on the detection data decreases. However, the degree of the decrease is not so great as to decrease the detection accuracy in the document size detection using the detection data.

<Step S37>
In step S37, the control unit 5 determines whether or not the ADF 1 has been opened with respect to the document placement surface 211A, as in step S12 of the reading control process.

  Here, if the control part 5 judges that ADF1 was opened (Yes side of S37), it will transfer a process to step S371. If ADF1 is not opened (No side in S37), the control unit 5 shifts the process to step S38.

<Step S38>
In step S38, the control unit 5 determines whether or not the first acquisition process has ended.

  Here, when the control unit 5 determines that the first acquisition process has been completed (Yes in S38), the control unit 5 ends the above-described reading process. If the first acquisition process is not completed (No in S38), the control unit 5 shifts the process to step S37 and waits for the end of the first acquisition process or the opening of ADF1.

<Step S371>
In step S371, the control unit 5 interrupts the first acquisition process and executes the third movement process. Here, the process of step S <b> 371 is executed by the third movement processing unit 55 of the control unit 5.

  As a result, in comparison with the configuration in which the reading unit 22 is moved to the size detection position P6 after the completion of the first acquisition process, the reading unit 22 reaches the size detection position P6 after the ADF 1 is opened. It is possible to shorten the time.

<Step S372>
In step S372, the control unit 5 executes the size detection process.

[Conveyance reading process]
Next, an example of the procedure of the conveyance reading process executed in step S113 of the reading control process will be described with reference to FIG.

<Step S41>
First, in step S41, the control unit 5 executes the second reading process. Here, the process of step S <b> 41 is executed by the second reading processing unit 58 of the control unit 5.

  In the second reading process, as in the first reading process, first, the color reference data is acquired from the color reference plate 215. The image processing unit 28 sets the color reference data by storing the acquired color reference data in the register.

  Next, in the second reading process, the reading unit 22 is moved from the home position P4 to the reading position P5.

  In the second reading process, the original is conveyed by the ADF 1 and image data is read from the original conveyed by the ADF 1. Here, the image processing unit 28 outputs the image data after the shading correction based on the color reference data set immediately before.

<Step S42>
In step S42, the control unit 5 executes the second acquisition process. Here, the process of step S <b> 42 is executed by the second acquisition processing unit 59 of the control unit 5. It should be noted that the following steps S43 and S44 are executed during the execution of the second movement process.

  The color reference data acquired by the second acquisition process is used for the shading correction performed on the detection data acquired before the next first reading process.

  When the process of step S431 described later is executed and the second acquisition process is interrupted, the color reference acquired in step S41 is used instead of the color reference data acquired by the second acquisition process. Data is used for the shading correction performed on the detection data. In this case, the accuracy of the shading correction performed on the detection data is reduced. However, the degree of the decrease is not so great as to decrease the detection accuracy in the document size detection using the detection data.

<Step S43>
In step S43, the control unit 5 determines whether or not the ADF 1 is opened with respect to the document placement surface 211A, similarly to step S12 of the reading control process.

  Here, if the control part 5 judges that ADF1 was opened (Yes side of S43), it will transfer a process to step S431. Moreover, if ADF1 is not opened (No side of S43), the control part 5 will transfer a process to step S44.

<Step S44>
In step S44, the control unit 5 determines whether or not the second acquisition process has ended.

  Here, when the control unit 5 determines that the second acquisition process has ended (Yes in S44), the control unit 5 ends the conveyance reading process. If the second acquisition process has not ended (No in S44), the control unit 5 shifts the process to step S43 and waits for the end of the second acquisition process or the opening of ADF1.

<Step S431>
In step S431, the control unit 5 interrupts the second acquisition process and executes the fourth movement process. Here, the process of step S431 is executed by the fourth movement processing unit 60 of the control unit 5.

  As a result, in comparison with the configuration in which the reading unit 22 is moved to the size detection position P6 after waiting for the end of the second acquisition process, the reading unit 22 reaches the size detection position P6 after the ADF 1 is opened. It is possible to shorten the time.

<Step S432>
In step S432, the control unit 5 executes the size detection process.

  Thus, in the image forming apparatus 10, when the ADF 1 is opened during the execution of the first movement process, the first movement process is interrupted, and the reading unit 22 is moved to the size detection position P6 via the home position P4. The second movement process is performed to move without performing. Thereby, it is possible to shorten the time from when the ADF 1 is opened until the reading unit 22 reaches the size detection position P6.

  The present invention may be applied to the image forming apparatus 10 including a document cover that does not have a document transport function, instead of the ADF 1. In this case, the control unit 5 may not include the second reading processing unit 58, the second acquisition processing unit 59, and the fourth movement processing unit 60.

  In the present invention, if the home position P4 is a position upstream of the reading range R11 (see FIG. 5) in the reading direction D21, the position where the light emitted from the light source 221 can be applied to the color reference plate 215. Not necessarily.

1 ADF
2 Image reading unit 3 Image forming unit 4 Paper feeding unit 5 Control unit 7 Operation display unit 8 Storage unit 10 Image forming apparatus 21 Housing 22 Reading unit 23 Mirror 24 Mirror 25 Optical lens 26 CCD
27 AFE circuit 28 Image processing unit 29 Drive unit 51 First reading processing unit 52 First movement processing unit 53 First acquisition processing unit 54 Second movement processing unit 55 Third movement processing unit 56 Data acquisition unit 57 Setting processing unit 58 First 2 reading processing unit 59 second acquisition processing unit 60 fourth movement processing unit

Claims (9)

A cover member provided to be openable and closable with respect to a document placement surface on which a document is placed;
A light emitting unit that is movably provided along a first direction parallel to the document placement surface, and that emits light irradiated on the document placement surface along a second direction orthogonal to the first direction; ,
A first reading processing unit that performs a first reading process of moving the light emitting unit in the first direction and reading image data of a document placed on the document placement surface;
After the completion of the first reading process, a first movement process is performed in which the light emission unit is moved to the home position on the upstream side in the first direction with respect to the reading range in which the light can be irradiated on the document placement surface. 1 movement processing unit;
When the cover member is opened during the execution of the first movement process, the first movement process is interrupted and the size of the document placed on the document placement surface in the reading range is detected by the light emission unit. A second movement processing unit capable of executing a second movement process for moving without moving through the home position to a size detection position from which detection data used for the acquisition is acquired;
An image reading apparatus comprising: The size detection position is a position within a specific range in which the light can be emitted to a document of a minimum size that can be detected by the own apparatus placed on the document placement surface according to a predetermined reference position. ,
The image reading apparatus according to claim 1. A data acquisition unit that acquires the detection data using the light emitting unit when the light emitting unit is within the specific range when the cover member is closed;
The image reading apparatus according to claim 2. A setting processing unit for setting a duplex reading mode for reading image data on both sides of a document placed on the document placement surface in accordance with a predetermined user operation;
The second movement processing unit is configured to display the first double-sided scanning mode when the double-sided scanning mode has been set and the image data on both sides of the document has been read, and when the double-sided scanning mode has not been set. Executing the second movement process by interrupting the movement process;
The image reading apparatus according to claim 1. The first movement processing unit is configured to start the light emission unit after the standby time corresponding to the size in the first direction in the document from which image data has been read in the first reading process from the end of the first reading process. Start moving,
The image reading apparatus according to claim 1. The home position is a position where color reference data used for shading correction performed on image data read using the light emitting unit can be acquired,
The image reading device includes:
A first acquisition processing unit for executing a first acquisition process for acquiring the color reference data using the light emitting unit after the first movement process is completed;
A third movement process for executing a third movement process for interrupting the first acquisition process and moving the light emission unit to the size detection position when the cover member is opened during the execution of the first acquisition process. And
An image reading apparatus according to any one of claims 1 to 5. An original conveying section that conveys an original via the irradiation position of the light emitted from the light emitting unit disposed at a predetermined reading position upstream of the home position in the first direction;
A second reading processing unit that executes a second reading process of moving the light emission unit to the reading position and reading image data of a document conveyed by the document conveying unit;
A second acquisition processing unit that executes a second acquisition process of acquiring the color reference data using the light emission unit by moving the light emission unit to the home position after the second reading process is completed;
A fourth movement process for executing a fourth movement process for interrupting the second acquisition process and moving the light emitting unit to the size detection position when the cover member is opened during the execution of the second acquisition process; And
An image reading apparatus according to claim 6. An image reading apparatus according to any one of claims 1 to 7,
An image forming unit that forms an image based on the image data;
An image forming apparatus comprising: A cover member that can be opened and closed with respect to a document placement surface on which the document is placed, and a cover member that is movable along a first direction parallel to the document placement surface and that is orthogonal to the first direction. An image reading method executed by an image reading apparatus comprising: a light emitting unit that emits light irradiated onto the document placement surface along two directions;
Performing a first reading process of moving the light emitting unit in the first direction to read image data of a document placed on the document placement surface;
After the completion of the first reading process, a first movement process is performed in which the light emission unit is moved to the home position on the upstream side in the first direction with respect to the reading range in which the light can be irradiated on the document placement surface. When,
When the cover member is opened during the execution of the first movement process, the first movement process is interrupted and the size of the document placed on the document placement surface in the reading range is detected by the light emission unit. A second movement process for moving to the size detection position where the detection data used for the acquisition is acquired without passing through the home position;
An image reading method including:

Images