JP6367602B2 - Image reading apparatus, image reading method and control program - Google Patents

Description

  The present invention relates to an image reading apparatus, an image reading method, and a control program, and more particularly, to an image reading apparatus, an image reading method, and a control program for simultaneously reading images on the front and back sides of a document.

  For example, Patent Document 1 discloses an image reading apparatus that reads information on a paper surface and stores it in a magnetic medium or an optical medium. A general image reading apparatus starts reading an image from a desired position on a paper surface by designating the head address of an effective pixel from which the image is read. Here, in order to increase the speed, it is common for the start address of the effective pixel to be specified by setting access restrictions such as 4-byte units and 8-byte units for CPU memory access.

Japanese Patent Laid-Open No. 06-253097

  In an image reading apparatus in which access restrictions such as 4-byte units and 8-byte units are set for memory access of the CPU, if it is desired to change the head address of the image reading area (effective pixel) in units of 1 byte, the image is temporarily stored. Are read into the image reading apparatus, and the read image is shifted by 1 byte unit by image processing.

  The present invention has been made in view of the above problems, and even when a predetermined unit of access restriction is set for CPU memory access, the start address of the image reading area is a unit smaller than the access restriction. It is an object of the present invention to provide an image reading apparatus, an image reading method, and a control program that can be fine-tuned by the user.

  In order to achieve the above object, an image reading apparatus according to the present invention outputs a drive signal for designating an image reading start position in units of a predetermined length L, and a time adjustment signal for adjusting the transfer timing of the drive signal. A control means for controlling, a control means for transferring the drive signal to the reading means based on the time adjustment signal, and a drive signal is transferred by moving on the image reading surface in a predetermined traveling direction at a constant speed. The time adjustment signal corresponds to a time during which the reading unit moves by a distance shorter than the predetermined length L.

  In order to achieve the above object, an image reading method according to the present invention starts to read an image by moving on an image reading surface in a predetermined traveling direction at a constant speed and transferring a drive signal. An image reading method using a reading unit, which outputs a drive signal for designating an image reading start position in units of a predetermined length L, corresponding to a time during which the reading unit moves by a distance shorter than the predetermined length L, and is driven A time adjustment signal for adjusting the signal transfer timing is output, and the drive signal output based on the time adjustment signal is transferred to the reading means.

  To achieve the above object, a control program according to the present invention moves at a constant speed on an image reading surface in a predetermined traveling direction and starts reading an image by transferring a drive signal. A control program for causing a computer of an image reading apparatus provided with means to execute, a procedure for outputting a drive signal for designating an image reading start position in units of a predetermined length L, a distance at which the reading means is shorter than a predetermined length L The procedure of outputting a time adjustment signal for adjusting the transfer timing of the drive signal corresponding to the movement time only, the procedure of transferring the drive signal output based on the time adjustment signal to the reading means, to the computer of the image reading apparatus Let it run.

  According to the above-described aspect of the present invention, even when a predetermined unit access restriction is set for the memory access of the CPU, the head address of the image reading area can be finely adjusted by a unit smaller than the access restriction.

1 is a block configuration diagram of an image reading apparatus 10 according to a first embodiment. 3 is an example of a timing chart of the image reading apparatus 10 according to the first embodiment. It is an example of the timing chart of the image reading apparatus 10B which concerns on 2nd Embodiment. It is a block block diagram of the simultaneous duplex scanner unit 100 which concerns on 3rd Embodiment. 10 is an example of a timing chart when the image reading start position is not adjusted in the simultaneous duplex scanner unit 100 according to the third embodiment. In the simultaneous double-sided scanner unit 100 according to the third embodiment, it is an example of a timing chart in the case where the reading start position of the surface is shifted from the initial value to the right by 1 byte. In the simultaneous double-sided scanner unit 100 according to the third embodiment, it is an example of a timing chart when the reading start position of the front surface is shifted from the initial value to the right by 2 to 4 bytes. 10 is an example of a timing chart when the image reading start position is not adjusted in the simultaneous duplex scanner unit 100 according to the third embodiment. In the simultaneous double-sided scanner unit 100 according to the third embodiment, it is an example of a timing chart in the case of shifting the reading start position of the surface from the initial value to the left by 1 byte. In the simultaneous double-sided scanner unit 100 according to the third embodiment, it is an example of a timing chart when the reading start position of the surface is shifted from the initial value to the left by 2 to 4 bytes. In the simultaneous double-sided scanner unit 100B according to the modification of the third embodiment, it is an example of a timing chart in the case of shifting the reading start position of the surface from the initial value to the left by 0 to 4 bytes.

<First Embodiment>
A first embodiment of the present invention will be described. A block diagram of the image reading apparatus according to the present embodiment is shown in FIG. FIG. 2A is a timing chart when the image reading start position is not finely adjusted. FIG. 2A is a timing chart when the image reading start position is advanced in the advancing direction of the reading unit 40 by a distance D shorter than the predetermined length L. FIG. 2B shows a timing chart when the image reading start position is returned to the direction opposite to the traveling direction of the reading means 40 by a distance D ′ shorter than the predetermined length L. FIG.

  In FIG. 1, the image reading apparatus 10 includes a control unit 20, an adjustment unit 30, and a reading unit 40.

  The control unit 20 generates a drive signal that designates the image reading start position in units of a predetermined length L and a time adjustment signal for adjusting the transfer timing of the drive signal, and outputs the generated signal to the adjustment unit 30.

  When the image reading start position is not finely adjusted, the control unit 20 according to the present embodiment generates a time adjustment signal (0) and outputs it to the adjustment unit 30 together with the drive signal. In addition, when the control unit 20 advances the image reading start position by the distance D shorter than the predetermined length L in the traveling direction of the reading unit 40, the control unit 20 adjusts the time adjustment signal (corresponding to the time d for the reading unit 40 to move by the distance D). d) is generated and output to the adjusting means 30 together with the drive signal. Further, when returning the image reading start position by a distance D ′ shorter than the predetermined length L in the direction opposite to the traveling direction of the reading unit 40, the control unit 20 takes time d ′ during which the reading unit 40 moves by the distance D ′. A corresponding time adjustment signal (−d ′) is generated and output to the adjustment means 30.

  The adjustment unit 30 transfers the drive signal input from the control unit 20 to the reading unit 40 at a timing based on the time adjustment signal input from the control unit 20.

  When the time adjustment signal (0) is input from the control means 20 together with the drive signal, the adjustment means 30 according to the present embodiment converts the input drive signal from the input time to the time x as shown in FIG. After the elapse, the data is transferred to the reading means 40. Further, when the time adjustment signal (d) is input together with the drive signal from the control unit 20, the adjustment unit 30 passes the input drive signal for a time (x + d) as shown in FIG. 2B. Later, it is transferred to the reading means 40. Furthermore, when the time adjustment signal (−d ′) is input together with the drive signal from the control unit 20, the adjustment unit 30 converts the input drive signal from the input time to the time (x) as shown in FIG. -D ') Transfer to reading means 40 after elapse.

  The reading unit 40 moves in a predetermined traveling direction on the reading surface of the document at a constant speed, and starts reading an image on the reading surface when a driving signal is transferred from the adjusting unit 30.

  As described above, in the image reading apparatus 10 according to the present embodiment, the control unit 20 generates a time adjustment signal corresponding to the distance to be finely adjusted and outputs it to the adjustment unit 30 together with the drive signal. Based on the time adjustment signal (0), the time adjustment signal (d), or the time adjustment signal (−d ′), the transfer timing of the drive signal to the reading unit 40 is adjusted. Accordingly, the image reading apparatus 10 according to the present embodiment can finely adjust the image reading start position for an adjustment distance shorter than the predetermined length L that is a unit for generating a drive signal.

<Second Embodiment>
A second embodiment will be described. The image reading apparatus according to the present embodiment is configured similarly to the image reading apparatus 10 shown in FIG. Hereinafter, the elements of the image reading apparatus 10B according to the present embodiment will be described by attaching “B” to each element of the image reading apparatus 10 shown in FIG. FIG. 3A is a timing chart when the image reading start position is not finely adjusted. FIG. 3A is a timing chart when the image reading start position is advanced in the advancing direction of the reading means 40 by a distance D shorter than the predetermined length L. FIG. 3B shows a timing chart in the case where the image reading start position is returned to the direction opposite to the advancing direction of the reading means 40 by a distance D ′ shorter than the predetermined length L. FIG.

  In addition to the drive signal and the time adjustment signal, the control unit 20B generates a position adjustment signal for instructing a distance for guiding the reading unit 40B to a predetermined position, and outputs the position adjustment signal to the adjustment unit 30B. Hereinafter, a state in which the reading unit 40B is guided to a predetermined position is referred to as a position adjustment state. When the image reading start position is not finely adjusted and when the control unit 20B according to the present embodiment advances the reading unit 40 in the traveling direction by a distance D shorter than the predetermined length L, the control unit 20B moves the reading unit 40B in the position-adjusted state by the distance 2X. A position adjustment signal (2X) for progressing is generated. On the other hand, when the image reading start position is returned by a distance D ′ shorter than the predetermined length L, the control unit 20B generates a position adjustment signal (X) for causing the reading unit 40B to advance by the distance X in the position adjustment state. .

  Furthermore, when returning the image reading start position in the opposite direction by the distance D ′, the control unit 20B according to the present embodiment uses the time d ″ as the time adjustment signal to move the reading unit 40B by the distance (X−D ′). A time adjustment signal (d ″) corresponding to is generated.

  That is, the control unit 20B outputs the time adjustment signal (0), the position adjustment signal (2X), and the drive signal when the image reading start position is not finely adjusted, and when the image is advanced by the distance D, the time adjustment signal (d). When the position adjustment signal (2X) and the drive signal are output and only the distance D ′ is returned, the time adjustment signal (d ″), the position adjustment signal (X), and the drive signal are output.

  When the time adjustment signal (0), the position adjustment signal (2X) and the drive signal are input from the control means 20B, the adjustment means 30B is based on the time adjustment signal (0) as shown in FIG. The input drive signal and position adjustment signal (2X) are transferred to the reading means 40B as they are. In addition, when the time adjustment signal (d), the position adjustment signal (2X), and the drive signal are input from the control unit 20B, the adjustment unit 30B outputs the time adjustment signal (d) as illustrated in FIG. Based on this, the input drive signal and position adjustment signal (2X) are transferred to the reading means 40B after the elapse of time d from the time of input. Further, when the time adjustment signal (d ″) and the position adjustment signal (X) are input from the control unit 20B, the adjustment unit 30B is based on the time adjustment signal (d ″) as shown in FIG. Then, the input drive signal and position adjustment signal (X) are transferred to the reading means 40B after the elapse of time d ″ from the time of input.

  The reading unit 40B moves on the reading surface of the document in a predetermined traveling direction at a constant speed, and when the drive signal and the position adjustment signal are input, the distance instructed by the position adjustment signal is the traveling direction in the position adjustment state. After moving to, image reading on the reading surface is started. When the position adjustment signal (2X) is input together with the drive signal, the reading unit 40B according to the present embodiment starts reading the image on the reading surface after a distance of 2X in the position adjustment state. On the other hand, when the position adjustment signal (X) is input together with the drive signal, the reading unit 40B starts reading the image on the reading surface after advancing the distance X in the position adjustment state.

  As described above, in the image reading apparatus 10B according to the present embodiment, the control unit 20B includes the time adjustment signal corresponding to the distance to be finely adjusted, and the position adjustment signal that indicates the distance to move the reading unit 40B in the position adjustment state. , Generate. Then, after the adjusting unit 30B adjusts the transfer timing of the drive signal according to the time adjustment signal and the reading unit 40B proceeds in the position adjustment state according to the position adjustment signal, image reading on the reading surface is started. As a result, the image reading apparatus 10B according to the present embodiment can finely adjust the image reading start position for an adjustment distance shorter than the predetermined length L, which is a drive signal generation unit.

<Third Embodiment>
A third embodiment will be described. FIG. 4 shows a block diagram of the simultaneous duplex scanner unit according to the present embodiment. In FIG. 4, the simultaneous duplex scanner unit 100 includes a front scanner module 110, a back scanner module 120, a front drive signal generator 130, a back drive signal generator 140, a data capture device 150, a USB device controller 160, a memory 170, and a CPU 180. Prepare.

  The surface scanner module 110 starts reading an image of the surface of the document set on the scanner body (not shown in FIG. 2) when a drive signal is input from the CPU 180 via the surface drive signal generator 130. The image data is output to the data capture device 150. Similarly, the back scanner module 120 starts reading an image on the back of the document when a drive signal is input from the CPU 180 via the back drive signal generator 140, and outputs the read image data to the data capture device 150. . As the front scanner module 110 and the back scanner module 120, for example, a contact image sensor (CIS) or the like can be applied.

  A driving signal and a timing control signal are input from the CPU 180 to the front surface driving signal generator 130 and the rear surface driving signal generator 140. The front surface drive signal generator 130 and the back surface drive signal generator 140 output the input drive signals to the front surface scanner module 110 and the back surface scanner module 120, respectively, based on the input timing control signal. The front surface drive signal generator 130 and the back surface drive signal generator 140 according to the present embodiment, when not finely adjusting the start position, the front surface scanner when the drive signal input from the CPU 180 is equivalent to 4 bytes from the input time. Output to module 110 and back scanner module 120, respectively. The timing control signal corresponds to the time adjustment signal in the claims.

  The data capture unit 150 captures image data read by the front surface scanner module 110 and the back surface scanner module 120 and stores the image data in the memory 170.

  The USB device controller 160 outputs data stored in the memory 170 to a PC main body not shown in FIG. 2 in accordance with a command from the CPU 180.

  The CPU 180 controls each unit. In the present embodiment, the CPU 180 generates drive signals for driving the front surface scanner module 110 and the back surface scanner module 120. According to the specification, the CPU 180 has an access restriction in units of 4 bytes, and generates a driving signal for adjusting the front surface scanner module 110 and the back surface scanner module 120 in units of 4 bytes. Further, the CPU 180 according to the present embodiment generates a timing control signal for finely adjusting the reading start position of the document. Then, CPU 180 outputs the generated drive signal and timing control signal to front surface drive signal generator 130 and back surface drive signal generator 140.

  Next, an operation flow when the original reading start position is not finely adjusted will be described. A front image data reading control time chart in this case is shown in FIG. 5A, and a back image data reading control time chart is shown in FIG. 5A and 5B, the drive signal is a timing when the drive signal is output from the CPU 180, and CIS_SP is a timing when the front surface drive signal generator 130 and the back surface drive signal generator 140 transfer the drive signal. . CIS_CLK is a reference clock signal for synchronizing the respective units of the simultaneous duplex scanner unit 100, and the processing contents indicate the contents processed by the front scanner module 110 and the rear scanner module 120 for each pixel.

  In the processing content, “0” is a standby pixel, and is a pixel corresponding to a standby state before the CPU 180 outputs a drive signal. “TA” is a pixel corresponding to a drive signal transfer timing adjustment period in the front surface scanner module 110 and the back surface scanner module 120, and in this embodiment, a 4-byte timing adjustment pixel is set. The position adjustment pixels (1) to (8) are pixels corresponding to the position adjustment until the reading start position is reached after the drive signals are input to the front surface scanner module 110 and the back surface scanner module 120. An 8-byte position adjustment pixel is set. Further, the effective pixels (9), (10),... Are pixels from which image data is read by the front surface scanner module 110 and the back surface scanner module 120.

  5A and 5B, when fine adjustment of the document reading start position is not performed, the CPU 180 drives the front scanner module 110 and the rear scanner module 120 for driving signals and 0 byte adjustment. A timing control signal is generated and output to the front surface drive signal generator 130 and the back surface drive signal generator 140 (drive signal).

  The front surface drive signal generator 130 and the back surface drive signal generator 140 are input when a period corresponding to a 4-byte timing adjustment pixel (TA) has elapsed due to the input of a 0-byte adjustment timing control signal. The drive signals are transferred to the front scanner module 110 and the back scanner module 120, respectively (CIS_SP).

  The front-side scanner module 110 and the back-side scanner module 120 perform 8-byte position adjustment to start reading image data by transferring the drive signal (CIS_SP) (position adjustment pixels (1) to (8)). ). Then, the front surface scanner module 110 and the back surface scanner module 120 start reading the image data of the front surface and the back surface from the 9th byte after the drive signal (CIS_SP) is input (effective pixels (9), (10), …).

  Next, a case where the reading start position on the surface is shifted by 1 byte from the initial value to the right side will be described. FIG. 6A shows a front image data reading control time chart and FIG. 6B shows a back image data reading control time chart. Here, since fine adjustment of the reading start position is not performed for the back surface, FIG. 6B is the same as FIG. 5B, and description thereof is omitted.

  In FIG. 6A, when the reading start position of the surface image is shifted by 1 byte from the initial value to the right side, the CPU 180 generates a timing control signal for +1 byte adjustment, and displays the driving signal and the timing control signal for +1 byte adjustment on the surface. Output to the drive signal generator 130 (drive signal).

  When a timing control signal for +1 byte adjustment is input together with the drive signal, the surface drive signal generator 130 further delays the transfer force timing of the drive signal input from the CPU 180 by 1 byte from the normal 4 bytes to the surface scanner at the 5th byte. Transfer to module 110 (CIS_SP). As a result, the front scanner module 110 receives a drive signal delayed by 1 byte and starts reading image data from a position delayed by 1 byte as compared with the case where fine adjustment of the position is not performed. That is, the front surface scanner module 110 starts reading image data from the position of the 10th byte in FIGS. 5 (a) and 6 (b).

  Next, a case where the reading start position on the surface is shifted from the initial value to the right by 2 to 4 bytes will be described. The surface image data reading control time chart when the front surface reading start position is shifted by 2 bytes from the initial value to the right side is shifted to 4 bytes in FIG. 7A, and the time chart when 3 bytes are shifted is shifted to 4 bytes in FIG. A time chart in this case is shown in FIG. Note that the back side is the same as FIG. 5B because fine adjustment of the reading start position is not performed.

  In FIG. 7A, when the reading start position of the surface is shifted 2 bytes from the initial value to the right side, the CPU 180 generates a timing control signal for +2 bytes adjustment and outputs it to the surface driving signal generator 130 together with the driving signal. Thereby, reading of the image data on the front surface is started with a delay of 2 bytes from the back surface scanner module 120. In FIG. 7B, when the reading start position of the surface is shifted 3 bytes from the initial value to the right side, the CPU 180 generates a timing control signal for +3 byte adjustment and outputs it to the surface driving signal generator 130 together with the driving signal. . As a result, reading of the image data on the front surface is started with a delay of 3 bytes from the back surface scanner module 120.

  Further, in FIG. 7C, when the front surface reading start position is shifted 4 bytes from the initial value to the right side, as described above, the CPU 180 adjusts the front surface scanner module 110 in units of 4 bytes. A timing control signal for 0 byte adjustment and a drive signal are output to the surface scanner module 110 at a timing of shifting to the right by 4 bytes from the module 120. The surface drive signal generator 130 outputs the input drive signal to the surface scanner module 110 when a portion corresponding to 4 bytes has elapsed. After the driving signal is input, the surface scanner module 110 starts reading the surface image data from the 9th byte (the 13th byte in FIG. 5A).

  Next, a case where the reading start position on the surface is shifted from the initial value to the left side will be described. FIG. 8A shows a front image data reading control time chart when fine adjustment of the original reading start position is not performed, and FIG. 8B shows a rear image data reading control time chart. Further, FIG. 9A shows a front image data reading control time chart and FIG. 9B shows a back image data reading control time chart when the front reading start position is shifted 1 byte from the initial value to the left side. . When fine adjustment of the reading start position of the original is not performed and the image data reading control on the back side is the same as in FIGS. 5A and 5B, FIGS. 8A, 8B, and 9B are performed. Description of is omitted.

  In FIG. 9A, when the reading start position of the surface is shifted by 1 byte from the initial value to the left side, the CPU 180 generates a timing control signal for −1 byte adjustment and outputs it to the surface driving signal generator 130 together with the driving signal. (Drive signal).

  When the timing control signal for −1 byte adjustment is input together with the driving signal, the surface driving signal generator 130 outputs the driving signal transfer timing to the surface scanner module 110 by advancing the normal 4 bytes by 1 byte (CIS_SP). As a result, the front surface scanner module 110 starts reading image data one byte earlier than in the case where the position adjustment shown in FIG. 8A is not performed.

  Similarly, FIG. 10A shows a time chart for controlling reading of the surface image data when the reading start position on the surface is shifted 2 bytes from the initial value to the left side. FIG. 10B shows a time chart for shifting the surface image data reading control position 3 bytes to the left side. FIG. 10 (c) shows a time chart for shifting 4 bytes to the left.

  10A and 10B, the CPU 180 generates a timing control signal for adjusting -2 bytes and a timing control signal for adjusting -3 bytes, respectively. Thereby, the surface scanner module 110 starts reading image data earlier by 2 bytes or 3 bytes than in the case where position adjustment is not performed.

  Further, in FIG. 10C, when the front surface reading start position is shifted to the left by 4 bytes, the CPU 180 generates a drive signal for shifting the back side scanner module 120 to the left by 4 bytes, and timing for 0 byte adjustment. It outputs to the surface scanner module 110 with a control signal.

  As described above, in the simultaneous duplex scanner unit 100 according to the present embodiment, the front surface drive signal generator 130 and the rear surface drive signal generator 140 are arranged between the CPU 180 and the front surface scanner module 110 and the rear surface scanner module 120. . The front drive signal generator 130 and the back drive signal generator 140 adjust the drive signal transfer timing in units of 1 byte, so that the reading start position of the document by the front scanner module 110 and the back scanner module 120 is changed back and forth in units of 1 byte. I was able to adjust to.

  Therefore, even when the CPU 180 has access restrictions due to specifications, the left and right positions can be finely adjusted using the timing control signal. Furthermore, since image processing is not used, throughput does not decrease.

<Modification of Third Embodiment>
A modification of the third embodiment will be described. The simultaneous duplex scanner unit according to the present embodiment is configured in the same manner as the simultaneous duplex scanner unit 100 of FIG. 4 described in the third embodiment. Hereinafter, the elements of the simultaneous duplex scanner unit 100B according to the present embodiment will be described with “B” attached to the elements of the simultaneous duplex scanner unit 100 shown in FIG.

  In the simultaneous duplex scanner unit 100B according to the present embodiment, the CPU 180B generates a drive signal that decrements the head address of the effective pixel by -4 when finely adjusting the reading start position of the front surface to the left side. The simultaneous double-sided scanner unit 100B operates in the same manner as in the third embodiment when the reading start position is shifted to the right side. Therefore, the case where the reading start position is shifted to the left side will be described below.

  FIG. 11A shows a time chart for controlling reading of the surface image data when the reading start position of the surface is not finely adjusted. FIG. 11B shows a time chart for shifting the reading start position of the surface to the left by 1 byte. FIG. 11C shows a time chart for shifting 2 bytes to the left, FIG. 11D shows a time chart for shifting 3 bytes to the left, and FIG. 11E shows a time chart for shifting 4 bytes to the left. Show.

  When fine adjustment of the reading start position on the surface is not performed, as shown in FIG. 11A, the CPU 180B generates a drive signal and a timing control signal for 0-byte adjustment and outputs it to the surface drive signal generator 130B. When the timing control signal for 0 byte adjustment is input, the surface drive signal generator 130B outputs the input drive signal to the surface scanner module 110B when a portion corresponding to 4 bytes has elapsed (CIS_SP). Thereby, the front surface scanner module 110B starts reading image data from the 9th byte.

  When the surface reading start position is shifted 1 byte to the left, as shown in FIG. 11B, the CPU 180B generates a driving signal for decrementing the head address of the effective pixel by -4 and a timing control signal for adjusting the 3-byte surface driving signal. Output to the device 130B. As a result, the surface drive signal generator 130B transfers the drive signal for decrementing the start address of the effective pixel to -4 by 3 bytes from the normal transfer timing, and transfers it to the surface scanner module 110B when 7 bytes have elapsed (CIS_SP). .

  The front scanner module 110B starts reading image data from the position of the 5th byte after the input of the drive signal when the drive signal for decrementing the head address of the effective pixel by -4 is input. That is, the front surface scanner module 110B starts reading image data from the 8th byte position when the front surface reading start position is not finely adjusted (FIG. 11A).

  When the reading start position on the front surface is shifted 2 bytes to the left, as shown in FIG. 11C, the CPU 180B generates a drive signal for decrementing the start address of the effective pixel by -4 and a timing control signal for +2 bytes adjustment. The front surface scanner module 110B starts reading image data from a position corresponding to the seventh byte when the front surface reading start position is not finely adjusted (FIG. 11A). Similarly, when the reading start position on the front surface is shifted 3 bytes to the left, as shown in FIG. 11D, the CPU 180B generates a driving signal for decrementing the head address of the effective pixel by -4 and a timing control signal for +1 byte adjustment. Then, the surface scanner module 110B starts reading image data from a position corresponding to the 6th byte when the reading start position on the surface is not finely adjusted (FIG. 11A).

  Further, when the front surface reading start position is shifted 4 bytes to the left side, as shown in FIG. 11E, the CPU 180B shifts the driving signal shifted to the left side by 4 bytes from the back surface scanner module 120B and timing control for 0 byte adjustment. A signal is generated and output to the surface drive signal generator 130B. As a result, the surface drive signal generator 130B outputs the input drive signal to the surface scanner module 110B (CIS_SP) when a portion corresponding to 4 bytes has elapsed (CIS_SP), and the surface scanner module 110B receives the 9th byte ( Image data reading is started from the fifth byte in FIG.

  The present invention is not limited to the above-described embodiment, and design changes and the like within a range not departing from the gist of the present invention are included in the present invention.

10, 10B Image reading device 20, 20B Control means 30, 30B Adjustment means 40, 40B Reading means 100, 100B Simultaneous double-sided scanner unit 110, 110B Front scanner module 120, 120B Back scanner module 130, 130B Front drive signal generator 140, 140B Back side drive signal generator 150, 150B Data capture device 160, 160B USB device controller 170, 170B Memory 180, 180B CPU

Claims (7)

Control means for outputting a drive signal for designating an image reading start position in units of a predetermined length L, and a time adjustment signal for adjusting the transfer timing of the drive signal;
Adjusting means for transferring the drive signal to the reading means based on the time adjustment signal;
A reading unit that moves in a predetermined traveling direction on the reading surface of the image at a constant speed and starts reading the image by transferring the drive signal;
With
The image reading apparatus according to claim 1, wherein the time adjustment signal corresponds to a time during which the reading unit moves by a distance shorter than the predetermined length L. If the adjustment means does not adjust the image reading start position, the drive signal after the elapse of time x represented by (the predetermined length L) / (the constant speed of the movement) from when the drive signal is input. To the reading means,
The image reading apparatus according to claim 1. When the image reading start position is advanced in the moving direction of the reading unit by a distance D shorter than the predetermined length L, the control unit corresponds to a time d corresponding to a time d during which the reading unit moves by the distance D together with the drive signal. The adjustment means outputs the adjustment signal, and the adjustment means transfers the drive signal to the reading means after a lapse of time (x + d) from when the drive signal is input.
When returning the image reading start position by a distance D ′ shorter than the predetermined length L in the direction opposite to the moving direction of the reading means, the control means corresponds to a time d ′ in which the reading means moves by the distance D ′. A second time adjustment signal to be generated, and the adjustment means transfers the drive signal to the reading means after a lapse of time (xd ′) from when the drive signal is input.
The image reading apparatus according to claim 2. The control means further outputs a position adjustment signal for designating a moving distance of the reading means,
If you do not adjust the image reading start position,
The control means outputs a position adjustment signal 2X designating a distance 2X as the movement distance together with a drive signal and a time adjustment signal,
The adjustment means transfers the output drive signal and position adjustment signal 2X to the reading means,
The reading unit starts reading the image when the driving signal is transferred and the distance is 2X;
The image reading apparatus according to claim 1. A first reading unit that moves in a first direction on the surface of the document at a constant speed and starts reading an image on the surface of the document by transferring the drive signal; and a document at a constant speed A second reading unit that moves in the second direction on the back surface of the document and starts reading an image on the back surface of the document when the drive signal is transferred,
The control means includes a first time adjustment signal for adjusting the transfer timing of the drive signal to the first reading means, and a second time adjustment for adjusting the transfer timing of the drive signal to the second reading means. Signal and output
The adjustment means transfers the drive signal to the first reading means based on the first time adjustment signal, and transfers the drive signal to the second reading means based on the second time adjustment signal. ,
The image reading apparatus according to any one of claims 1 to 4. An image reading method using reading means that moves on a reading surface of an image in a predetermined traveling direction at a constant speed and starts reading the image by transferring a drive signal,
A drive signal for designating an image reading start position in units of a predetermined length L is output.
Corresponding to the time when the reading means moves by a distance shorter than the predetermined length L, a time adjustment signal for adjusting the transfer timing of the drive signal is output,
Transferring the output drive signal to the reading means based on the time adjustment signal;
Image reading method. An image reading apparatus including a reading unit that moves at a constant speed on a reading surface of an image in a predetermined traveling direction and starts reading of the image by transferring a driving signal. A control program,
A procedure for outputting a drive signal for designating an image reading start position in units of a predetermined length L;
A procedure for outputting a time adjustment signal for adjusting a transfer timing of the drive signal in response to a time during which the reading unit moves by a distance shorter than the predetermined length L;
A procedure for transferring the output drive signal to the reading means based on the time adjustment signal;
Is a control program for causing the computer of the image reading apparatus to execute.

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