Sheet reading apparatus and reading method

Abstract

To provide a sheet reading apparatus capable of realizing power saving and high efficiency by not performing a useless position adjustment of a light-emitting section when turning on a power source, and a reading method.SOLUTION: A sheet reading apparatus 100 comprises a reading device 1 and a power supply unit 2. A position detection section 160 detects a position of a light-emitting section 130. A power detection section 161 detects ON or OFF of power supply by the power supply unit 2. A storage section 162 stores a stop position of the light-emitting section 130 at the time when OFF is detected. When the power detection section 161 detects ON, a drive control section 164 controls whether to execute a position adjustment of the light-emitting section 130 on the basis of the stop position. A determination section 163 determines whether or not the stop position is a home position 17. Based on a determination result that the stop position is the home position 17, the drive control section 164 performs control so as not to execute the position adjustment when the power detection section 161 detects ON.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a sheet reading device and a reading method. [Background technology]

[0002] Patent Document 1 discloses an image reading device that moves a carriage to a home position when the power is turned on. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-93806 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, in Patent Document 1, even if the carriage is in the home position when the power is turned on, the carriage is first moved to a position other than the home position, and then the carriage is moved to the home position for position adjustment.

[0005] An object of the present invention is to provide a sheet reading device and a reading method that can achieve power saving and high efficiency by eliminating unnecessary position adjustment of a light emitting unit when the power is turned on. [Means for solving the problem]

[0006] The sheet reading device according to the present invention includes a reading device and a power supply unit. The reading device reads a sheet. The power supply unit supplies power to the reading device. The reading device includes a light emitting unit, a position detection unit, a storage unit, a drive control unit, and a determination unit. The light emitting unit irradiates the sheet with light while scanning the sheet. The position detection unit detects the position of the light emitting unit. The power detection unit detects ON or OFF of the power supply unit. The storage unit stores the stop position of the light emitting unit when the OFF is detected. When the power detection unit detects the ON, the drive control unit controls whether or not to perform position adjustment of the light emitting unit based on the stop position. The determination unit determines whether or not the stop position was a home position. The drive control unit controls not to perform the position adjustment when the power detection unit detects the ON based on the determination result that the stop position was the home position.

[0007] The reading method of the present invention includes the steps of irradiating light onto a sheet while scanning the sheet with a light-emitting unit, reading the sheet by light reflected from the sheet by the irradiated light, detecting when power supply is turned off, detecting the stop position of the light-emitting unit when the OFF is detected, storing the stop position, detecting when the power supply is turned on, determining whether the stop position was a home position, and controlling so as not to perform the position adjustment when the ON is detected based on the determination result that the stop position was the home position. Effect of the Invention

[0008] According to the present invention, it is possible to provide a sheet reading device and a reading method that can realize power saving and high efficiency by eliminating unnecessary position adjustment of a light emitting unit when the power is turned on. [Brief description of the drawings]

[0009] [Figure 1]1 is a front view of a sheet reading device according to an embodiment of the present invention; [Diagram 2] FIG. 2 is a top view of the reading device of the sheet reading device according to the embodiment of the present invention. [Diagram 3] FIG. 2 is a front view of the reading device of the sheet reading device according to the embodiment of the present invention. [Figure 4] FIG. 2 is a front view of a reading device on which a reference plate is disposed. [Diagram 5] 2 is a block diagram showing a control device of the sheet reading device according to the embodiment of the present invention. FIG. [Figure 6] FIG. 4 is a diagram showing an example of a reference plate arranged in a reading device. [Figure 7] FIG. 4 is a diagram illustrating an example of a reference plate. [Figure 8] 11A and 11B are diagrams illustrating a pattern for moving a light emitting unit of the sheet reading device according to the embodiment of the present invention to a home position. [Figure 9] 11A and 11B are diagrams illustrating a pattern for moving a light emitting unit of the sheet reading device according to the embodiment of the present invention to a home position. [Figure 10] 11A and 11B are diagrams illustrating a pattern for moving a light emitting unit of the sheet reading device according to the embodiment of the present invention to a home position. [Figure 11] 4 is a flowchart illustrating a reading method according to an embodiment of the present invention. [Figure 12] 4 is a flowchart illustrating a reading method according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, a sheet reading device 100 according to an embodiment of the present invention will be described with reference to Fig. 1. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0011] FIG. 1 is a front view of a sheet reading device 100 according to an embodiment of the present invention.

[0012] Examples of the sheet reading device 100 include a scanner, a copier, a copy machine, and a facsimile. The sheet reading device 100 may further include an image forming device (not shown). The sheet reading device 100 may be an MFP (Multi Function Printer) combined with an image forming device.

[0013] The configuration of the image forming apparatus will be briefly described below: The image forming apparatus has a feeding and conveying section, an image creating function section, a fixing section, and a discharging section.

[0014] The feeding and conveying section feeds the sheets stored in the tray, and conveys the sheets to the image creating section, the fixing section, and the discharge section.

[0015] The image forming function unit forms an image on a sheet by using a developer such as toner. When the image forming function unit is an electrophotographic type, the image forming function unit includes a photoconductor, a charging device, an exposure device, a developing device, a transfer device, a cleaning device, and a charge removing device.

[0016] The fuser section applies heat and pressure to the toner image developed on the sheet to fuse the toner image to the sheet.

[0017] The discharge section discharges and stores the sheet outside the housing of the image forming function section.

[0018] Next, as shown in FIG. 1, a sheet reading device 100 includes a reading device 1, a power supply unit 2, and a conveying device 3. The reading device 100 includes a reading device 1, a power supply unit 2, and a conveying device 3.

[0019] The reading device 1 reads the sheet. That is, the reading device 1 reads the image written on the sheet and outputs the image data.

[0020] The power supply unit 2 supplies power to the reading device 1. The power supply unit 2 may also supply power to the transport device 3.

[0021] The conveying device 3 conveys the sheet.

[0022] An example of the conveying device 3 is an ADF 3 (Auto Document Feeder) or a DP 3 (Document Processor). Hereinafter, the conveying device 3 may be referred to as the DP 3.

[0023] Next, the configuration of the reading device 1 will be described with reference to Fig. 1 as well as Fig. 2 to Fig. 4. Fig. 2 is a top view of the reading device 1 of the sheet reading device 100 according to this embodiment. Fig. 3 is a front view of the reading device 1 of the sheet reading device 100 according to this embodiment. Fig. 4 is a front view of the reading device 1 on which a reference plate 18 is arranged.

[0024] As shown in Figures 1 to 4, the reading device 1 has a housing 10, a reading glass 11, an original glass 12, a carriage 13, a reflecting unit 14, a light receiving unit 15, a control device 16, a home position 17, and a reference plate 18.

[0025] A reading glass 11 and an original glass 12 are attached to the housing 10.

[0026] The housing 10 incorporates a carriage 13, a reflecting section 14, a light receiving section 15, a home position 17, and a reference plate 18.

[0027] The control device 16 may be disposed in the reading device 1. The control device 16 may be disposed in the transport device 3.

[0028] The reading glass 11 transmits light irradiated from a light-emitting unit 130 (described later) of the carriage 13 onto the sheet S, and light reflected from the irradiated light by the sheet S. That is, when the conveying device 3 is closed with respect to the reading device 1, the reading glass 11 transmits light irradiated from the light-emitting unit 130 of the carriage 13 onto the sheet S, and light reflected from the irradiated light by the sheet S.

[0029] A sheet S can be placed on the document glass 12. The document glass 12 transmits light irradiated onto the sheet S from a light emitting unit 130 of the carriage 13 and light reflected by the sheet S.

[0030] The carriage 13 moves a light emitting functional member (to be described later) along the reading glass 11 or the document glass 12 .

[0031] The reflecting section 14 reflects the light reflected by the sheet S. The reflecting section 14 guides the reflected light to the light receiving section 15.

[0032] The light receiving section 15 receives the reflected light guided from the reflecting section 14. The light receiving section 15 may receive the reflected light and output image data.

[0033] The control device 16 is, for example, a processor such as a CPU (Central Processing Unit). The control device 16 may be an integrated circuit such as a SoC (System-on-a-Chip) in which other components are integrated. The control device 16 may be configured by combining a plurality of integrated circuits. The control device 16 comprehensively controls the operation of the sheet reading device 100 to realize various functions.

[0034] The home position 17 is a reference position for the carriage 13 to move accurately relative to the sheet S. The carriage 13 must be located at the home position 17 before reading the sheet S.

[0035] The reference plate 18 is referenced for the movement of the carriage 13 to the home position 17 .

[0036] For example, a metal rule may be provided at the home position. For example, a mark such as a bar code may be provided at the home position.

[0037] For example, a metal ruler or a mark such as a bar code may be provided near the home position.

[0038] A mark such as a metal ruler or a bar code is provided at or near the home position, so that the carriage 13 can be moved to the home position 17 appropriately.

[0039] Next, the configuration of the carriage 13 will be described.

[0040] As shown in FIGS. 2 and 3, the carriage 13 includes a light emitting unit 130, a reflecting mirror 131, and a motor 132.

[0041] The light-emitting unit 130 emits light. An example of the light-emitting unit 130 is an LED (Light-Emitting Diode). The light-emitting unit 130 irradiates the sheet S with irradiation light while moving relative to the sheet.

[0042] As described above, the reflecting mirror 131 further reflects light that is emitted from the light emitting unit 130 to the sheet S and reflected by the sheet S. The reflecting mirror 131 guides the reflected light to the reflecting unit 14.

[0043] The motor 132 moves the carriage 13. The motor 132 rotates a gear (not shown) and moves a belt (not shown) wound around the gear, thereby moving the carriage 13. As shown in Figures 2 and 3, the carriage 13 is moved in the direction of the double-headed arrow X by the belt.

[0044] Specific examples of the motor 132 include a stepping motor, a servo motor, and a DC motor (DC: Direct Current).

[0045] A stepping motor is a motor that can rotate in steps and is particularly used to move the carriage 13 to the home position 17 accurately.

[0046] A servo motor is a motor whose position is controlled by feedback control, and is used in particular for precise positioning of the carriage 13.

[0047] The DC motor is a motor driven by a direct current power source, and is used in particular for the scan speed and traverse (movement of the scan range) of the carriage 13.

[0048] 2 and 3, the reflecting unit 14 may have a reflecting mirror 140 and a reflecting mirror 141. The reflecting unit 14 reflects the light reflected by the reflecting mirror 131 of the carriage 13 by a combination of the reflecting mirror 140 and the reflecting mirror 141, and further guides the reflected light to the light receiving unit 15.

[0049] In the present embodiment, the carriage 13, the reflecting unit 14, and the light receiving unit 15 are described as being independent, but the reading device 1 may be a CIS (Contact Image Sensor).

[0050] In the following description, the position of the light emitting unit 130 may be replaced with the position of the carriage 13.

[0051] In the following description, the combination of the carriage 13, the reflecting unit 14, and the light receiving unit 15 may be replaced with a CIS.

[0052] In the following description, the light emitting unit 130 of the carriage 13 may be replaced with a CIS.

[0053] The CIS can read the sheet S in close proximity to the reading glass 11 and the document glass 12. Therefore, the CIS has the characteristic that it can read the sheet S at a relatively high speed.

[0054] The CIS may be configured by integrating a light source, a light sensor, and a signal processing circuit.

[0055] An example of a light source for a CIS is an LED array. An example of a light sensor for a CIS is a Complementary Metal-Oxide-Semiconductor (CMOS) sensor.

[0056] Next, the configuration and control of the control device 16 will be described in detail with reference to Fig. 5. Fig. 5 is a block diagram showing the control device 16 of the sheet reading device 100 according to the embodiment of the present invention.

[0057] As shown in FIG. 5, the control device 16 includes a position detection unit 160, a storage unit 162, a power detection unit 161, a determination unit 163, and a drive control unit 164.

[0058] The position detection unit 160, the storage unit 162, the power detection unit 161, the determination unit 163, and the drive control unit 164 may be realized by an ASIC (Application Specific Integrated Circuit).

[0059] The position detection unit 160 detects the position of the light emitting unit 130. As described above, the position detection unit 160 may be a CIS optical sensor.

[0060] The power detection unit 161 detects whether the power supply unit 2 supplies power that is ON or OFF.

[0061] The storage unit 162 stores the stop position of the light-emitting unit 130 when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off. As described above, the storage unit 162 can be realized by an ASIC, and may also be a RAM (Random Access Memory), a ROM (Read-Only Memory), a flash memory, a cache memory, or a hard disk drive.

[0062] The storage unit 162 may store a "signal H" when the light-emitting unit 130 is at the home position 17. The storage unit 162 may store a "signal L" when the light-emitting unit 130 is not at the home position 17.

[0063] The storage unit 162 may store "signal 1" when the light-emitting unit 130 is at the home position 17. The storage unit 162 may store "signal 0" when the light-emitting unit 130 is not at the home position 17.

[0064] The drive control unit 164 controls whether or not to adjust the position of the light-emitting unit 130 when the power detection unit 161 detects that the power supply by the power supply unit 2 is ON, based on the stopping position of the light-emitting unit 130 when the power detection unit 161 detects that the power supply by the power supply unit 2 is OFF.

[0065] The determination unit 163 determines whether the stop position of the light emitting unit 130 when the power detection unit 161 detects that the power supply unit 2 has turned off the power supply is the home position.

[0066] Based on the determination result that the stopping position of the light-emitting unit 130 was the home position 17 when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned OFF, the drive control unit 164 controls so as not to adjust the position of the light-emitting unit 130 when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned ON.

[0067] According to this embodiment, if the position of the light-emitting unit 130 is the home position 17 when the power detection unit 161 detects that the power supply unit 2 has turned off, the drive control unit 164 can control the light-emitting unit 130 not to perform unnecessary position adjustment when the power is turned on thereafter. This makes it possible to realize power saving and high efficiency of the sheet reading device 100.

[0068] The home position 17 will be described again with reference to FIGS.

[0069] The home position 17 is a reference point for the light-emitting unit 130 to identify the exact position of the sheet S. The home position 17 is used by the light-emitting unit 130 to ensure an accurate scanning position.

[0070] The light-emitting unit 130 starts the reading operation of the sheet S from the home position 17, and moves based on a specific coordinate system and scanning range. By moving to the home position 17, the light-emitting unit 130 can read the sheet S from a predictable position, and can output highly accurate image data.

[0071] The home position 17 may be used for calibration or autofocus. When the light emitting unit 130 moves to the home position 17, the light receiving unit 15 or the motor 132 may be calibrated in addition to the light emitting unit 130. Calibration allows the components of the carriage 13 to be accurately aligned, improving the accuracy of image data.

[0072] When the light-emitting unit 130 moves to the home position 17, the light-receiving unit 15 may be subjected to autofocus processing in addition to the light-emitting unit 130. By the autofocus processing, the focal points of the light-emitting unit 130 and the light-receiving unit 15 are corrected, and the image data read from the sheet S becomes clearer.

[0073] The home position 17 may be used to correct the position of the carriage 13 including the light emitting unit 130. The sheet reading device 100 may not be used for a long period of time. The sheet reading device 100 may be transported. Therefore, when the sheet reading device 100 is started up (when the power supply unit 2 turns on the power supply), the light emitting unit 130 is moved to the home position 17, thereby preventing mechanical damage and malfunction.

[0074] However, if the memory unit 162 stores information that the position of the light-emitting unit 130 was the home position 17 when the power detection unit 161 detects that the power supply by the power supply unit 2 is turned OFF, then adjusting the position of the light-emitting unit 130 to the home position 17 when the power detection unit 161 detects that the power supply by the power supply unit 2 is turned ON will cause unnecessary power consumption by the sheet reading device 100.

[0075] Furthermore, after the power detection unit 161 detects that the power supply unit 2 has turned on the power supply, a time lag occurs until the light emitting unit 130 starts reading the sheet S, which causes a decrease in the reading efficiency.

[0076] Therefore, if the position of the light-emitting unit 130 is the home position 17 when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned OFF, it is preferable that the drive control unit 164 control the light-emitting unit 130 not to adjust the position when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned ON.

[0077] In other words, if the memory unit 162 stores "signal H" when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned OFF, then the position of the light-emitting unit 130 is the home position 17, and therefore the drive control unit 164 controls the drive control unit 164 not to adjust the position of the light-emitting unit 130 when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned ON.

[0078] Next, as shown in FIG. 5, the drive control unit 164 may further perform control to perform a position adjustment to move the light-emitting unit 130 to the home position 17 when the power detection unit 161 detects that the power supply by the power supply unit 2 is turned ON, based on the determination result that the stopping position of the light-emitting unit 130 was not the home position 17 when the power detection unit 161 detects that the power supply by the power supply unit 2 is turned OFF.

[0079] That is, the determination unit 163 determines whether the stop position of the light emitting unit 130 was the home position 17 when the power detection unit 161 detected that the power supply unit 2 had turned off the power supply.

[0080] The determination unit 163 determines that the stop position of the light emitting unit 130 when the power detection unit 161 detects that the power supply unit 2 has turned off the power supply is not the home position 17 .

[0081] Based on the determination result that the stopping position of the light-emitting unit 130 when the power detection unit 161 detects that the power supply by the power supply unit 2 is turned OFF is not the home position 17, the drive control unit 164 controls to perform position adjustment to move the light-emitting unit 130 to the home position 17 when the power detection unit 161 detects that the power supply by the power supply unit 2 is turned ON.

[0082] According to this embodiment, the drive control unit 164 realizes power saving and high efficiency of the sheet reading device 100 when the position of the light-emitting unit 130 is the home position 17 when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off, and further, if the position of the light-emitting unit 130 is not the home position 17 when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off, the drive control unit 164 can suitably adjust the position of the light-emitting unit 130 to the home position 17 when the power is subsequently turned on, thereby further realizing high efficiency of the sheet reading device 100.

[0083] Specifically, the memory unit 162 may store a "signal L" when the light-emitting unit 130 is not at the home position 17. The memory unit 162 may store a "signal 0" when the light-emitting unit 130 is not at the home position 17. In other words, the memory unit 162 stores as a "signal L" or a "signal 0" that the position of the light-emitting unit 130 was not at the home position 17 when the power detection unit 161 detected that the power supply by the power supply unit 2 was turned off.

[0084] The drive control unit 164 realizes power saving and high efficiency of the sheet reading device 100 when the position of the light-emitting unit 130 is at the home position 17 when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off, and further, if the position of the light-emitting unit 130 is not at the home position 17 when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off, the drive control unit 164 can suitably adjust the position of the light-emitting unit 130 to the home position 17 when the power is subsequently turned on, thereby realizing high efficiency of the sheet reading device 100.

[0085] 2 and 3, the reading device 1 has the document glass 12. On the document glass 12, a sheet S is placed.

[0086] The reference plate 18 is disposed parallel to the original glass 12. The reference plate 18 is formed to extend parallel to the direction in which the light emitting unit 130 moves.

[0087] The storage unit 162 further stores the stop position where the light emitting unit 130 was stopped facing the document glass 12 when the power detection unit 161 detected that the power supply by the power supply unit 2 was turned off.

[0088] When the stopping position of the light-emitting unit 130 is a position facing the document glass 12, when the power detection unit 161 detects that the power supply by the power supply unit 2 is ON, the drive control unit 164 controls the light-emitting unit 130 to move and perform position adjustment to move the light-emitting unit 130 to the home position 17 based on at least a combination of the color of the reference plate 18 corresponding to the stopping position of the light-emitting unit 130 and the color of the reference plate 18 corresponding to the destination of the light-emitting unit 130.

[0089] According to this embodiment, even if the position of the light-emitting unit 130 is not the home position 17 when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off, the drive control unit 164 can suitably move the light-emitting unit 130 to the home position 17 based on the combination of the color of the reference plate 18 corresponding to the stopping position of the light-emitting unit 130 and the color of the reference plate 18 corresponding to the destination of the light-emitting unit 130.

[0090] That is, the determination unit 163 determines whether the stop position of the light emitting unit 130 was the home position 17 when the power detection unit 161 detected that the power supply unit 2 had turned off the power supply.

[0091] The determination unit 163 determines that the stop position of the light emitting unit 130 when the power detection unit 161 detects that the power supply unit 2 has turned off the power supply is not the home position 17 .

[0092] Based on the determination result, when the power detection unit 161 detects that the power supply by the power supply unit 2 is ON, the drive control unit 164 controls the light-emitting unit 130 to move and perform position adjustment to move the light-emitting unit 130 to the home position 17 based on the combination of the color of the reference plate 18 corresponding to the stopping position of the light-emitting unit 130 and the color of the reference plate 18 corresponding to the destination of the light-emitting unit 130.

[0093] Next, returning to FIG. 1 again, the conveying device 3 of the sheet reading device 100 according to this embodiment will be described.

[0094] As shown in FIG. 1, a conveying device 3 conveys a sheet S.

[0095] As described with reference to FIG. 2, the reading device 1 includes the reading glass 11 and the reference plate 18.

[0096] The sheet S passes through the reading glass 11. The reading glass 11 transmits the light irradiated by the CIS of the reading device 1.

[0097] The reference plate 18 is disposed parallel to the reading glass 11, and is formed to extend parallel to the moving direction (the left-right direction in FIGS. 2 and 3) of the CIS (light-emitting unit 130).

[0098] In FIG. 1, the conveying device 3 includes a sheet tray 30, a feed roller 31, a conveying roller 32, a conveying path 33, a reading unit , and a discharge tray .

[0099] The sheet tray 30 stores the sheets S therein.

[0100] The feeding roller 31 picks up the sheet S accommodated in the sheet tray 30 and feeds the sheet S to a conveying path 33 .

[0101] The transport rollers 32 transport the sheet S fed from the sheet tray 30 to a transport path 33 .

[0102] The transport path 33 is formed to extend from the sheet tray 30 through the reading unit 34 to the discharge tray 35 .

[0103] The reading unit 34 reads the sheet S transported through the transport path 33. The reading unit 34 is disposed at a position facing the reading glass 11 in the transport device 3. That is, as shown in Fig. 1, when the transport device 3 is closed with respect to the reading device 1, the reading unit 34 is disposed at a position facing the reading glass 11 shown in Fig. 2.

[0104] The reading unit 34 particularly reads the back surface of the sheet S transported along the transport path 33 .

[0105] The discharge tray 35 receives the sheet S discharged from the conveying path 33 .

[0106] Next, as shown in FIG. 5, the memory unit 162 stores the stop position where the light emitting unit 130 was stopped facing the reading glass 11 when the power detection unit 161 detected that the power supply by the power supply unit 2 was turned off.

[0107] When the stopping position of the light-emitting unit 130 is a position facing the reading glass 12, when the power detection unit 161 detects that the power supply by the power supply unit 2 is ON, the drive control unit 164 controls the light-emitting unit 130 to move and perform position adjustment to move the light-emitting unit 130 to the home position 17 based on at least a combination of the color of the reference plate 18 corresponding to the stopping position of the light-emitting unit 130 and the color of the reference plate 18 corresponding to the destination of the light-emitting unit 130.

[0108] According to this embodiment, the drive control unit 164 can perform position adjustment to move the light emitting unit 130 to the home position 17 in an appropriate manner by using the reference plate 18 in which a plurality of colors are combined.

[0109] That is, the determination unit 163 determines whether the stop position of the light emitting unit 130 was the home position 17 when the power detection unit 161 detected that the power supply unit 2 had turned off the power supply.

[0110] The determination unit 163 determines that the stop position of the light emitting unit 130 when the power detection unit 161 detects that the power supply unit 2 has turned off the power supply is not the home position 17 .

[0111] If the judgment unit 163 judges that the stopping position of the light-emitting unit 130 is a position facing the reading glass 12, the drive control unit 164 controls the light-emitting unit 130 to perform a position adjustment to move the light-emitting unit 130 to the home position 17 when the power detection unit 161 detects that the power supply by the power supply unit 2 is ON.

[0112] The drive control unit 164 controls the light-emitting unit 130 to perform position adjustment to move to the home position 17 based on a combination of the color of the reference plate 18 corresponding to the stopping position of the light-emitting unit 130 and the color of the reference plate 18 corresponding to the destination of the light-emitting unit 130.

[0113] The color combination of the reference plate 18 will be described later with reference to FIGS.

[0114] Next, a specific example of position adjustment in which the drive control unit 164 moves the light emitting unit 130 to the home position 17 will be described in detail with reference to FIGS. 6 to 10 in addition to FIGS.

[0115] Fig. 6 and Fig. 7 are diagrams showing an example of the reference plate 18. Fig. 8 to Fig. 10 are diagrams showing patterns for moving the light emitting unit 130 of the sheet reading device 100 according to this embodiment to the home position 17.

[0116] 6 and 7, the reference plate 18 is disposed parallel to the original glass 12 (the left-right direction in FIG. 4, the transport direction of the carriage 13, or the scanning direction of the CIS). The reference plate 18 is formed to extend parallel to the movement direction of the CIS (the left-right direction in FIG. 4, or the scanning direction of the CIS).

[0117] First, as shown in FIG. 6, the reference plate 18 has a white portion (white portion 182, white portion 184), a black portion (black portion 180, black portion 185), and a specific color portion 186 other than the white portion (white portion 182, white portion 184) and the black portion (black portion 180, black portion 185).

[0118] According to this embodiment, the drive control unit 164 can execute position adjustment to suitably move the light emitting unit 130 to the home position 17 by using the combination of colors provided on the reference plate 18 .

[0119] As shown in FIG. 6, the reference plate 18 has a first area 18a, a second area 18b, and a third area 18c.

[0120] The first area 18 a is a black portion 180 .

[0121] In the second region 18b, a white portion 182 (rear white reference plate 182), a black portion 183, and a white portion 184 (front white reference plate 184) are formed in this order from left to right in FIG.

[0122] In the third region 18c, a black portion 185 and a specific color portion 186 are formed in this order from the left side to the right side in FIG.

[0123] A glass portion 181 is formed between the first area 18a and the second area 18b of the reference plate 18. The glass portion 181 is a portion where the rear end of the reading glass 11 described in FIG.

[0124] The home position 17 is disposed between the second area 18b and the third area 18c of the reference plate 18. The home position 17 is formed across the front and rear direction of the reading device 1, as shown in FIG.

[0125] Next, the dimensions of the reference plate 18 may be set as shown in FIG. 7, by way of example.

[0126] Figures 8 and 9 show patterns in which the drive control unit 164 moves the CIS of the sheet reading device 100 to the home position 17 when the position of the light-emitting unit 130 (hereinafter, in Figures 8 to 10, the light-emitting unit 130 will be referred to as CIS) when the power detection unit 161 detects that the power is turned off is not at the home position 17 and the position of the CIS is unknown.

[0127] 8 and 9 show patterns 1 to 12. For each of patterns 1 to 12, Fig. 8 and Fig. 9 show estimated position information of the CIS when power detection unit 161 detects that power supply by power supply unit 2 has been turned OFF, an estimated stop position of the CIS, color information when the CIS reads reference plate 18 when power detection unit 161 detects that power supply by power supply unit 2 has been turned ON, color information when the CIS reads reference plate 18 when the CIS is moved 15 mm to the left, color information when the CIS reads reference plate 18 when the CIS is moved 25 mm to the right, color information when the CIS reads reference plate 18 when the CIS is moved 45 mm to the right, color information when the CIS reads reference plate 18 when the CIS is moved 248 mm to the left, and an operation of moving the CIS to home position 17.

[0128] In pattern 1, as shown in FIG. 1, when power detection unit 161 detects that power supply unit 2 has turned off the power supply, it is unclear whether the estimated position of the CIS was on the reading glass 11 side or the document glass 12 side of home position 17 shown in FIG. 2 when ADF 3 (hereinafter, in FIG. 8 to FIG. 10, ADF 3 will be referred to as DP3) is closed relative to housing 10 of reading device 1.

[0129] 8 and 9, in pattern 1, it is estimated that the CIS stopped at the white portion 184 (front white reference plate).

[0130] When the power detection unit 161 detected that the power supply unit 2 had turned on the power supply, the CIS detected the white portion 182 or the white portion 184 of the reference plate 18 .

[0131] The drive control unit 164 moves the CIS 15 mm to the left. The CIS detects the white portion 182 or the white portion 184 of the reference plate 18.

[0132] The drive control unit 164 moves the CIS 25 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0133] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0134] In pattern 2, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be on the reading glass 11 side shown in FIG. 2 rather than the home position 17 when the DP 3 is closed relative to the housing 10 of the reading device 1.

[0135] 8 and 9, in pattern 2, it is estimated that the CIS was stopped at the white portion 182 (rear white reference plate).

[0136] Also, the CIS must be located within a range of 1 to 5 mm from the right end of the white portion 182 shown in FIG. 8, and the surface of the reading glass 11 must be white.

[0137] When the power detection unit 161 detected that the power supply unit 2 had turned on the power supply, the CIS detected the white portion 182 or the white portion 184 of the reference plate 18 .

[0138] The drive control unit 164 moves the CIS 15 mm to the left. The CIS detects the white portion 182 or the white portion 184 of the reference plate 18.

[0139] The drive control unit 164 moves the CIS 25 mm to the right. The CIS detects the white portion 182 or the white portion 184 of the reference plate 18.

[0140] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0141] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0142] In pattern 3, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be on the reading glass 11 side shown in FIG. 2 rather than the home position 17 when the DP 3 is closed relative to the housing 10 of the reading device 1.

[0143] 7 and 8, in pattern 3, it is estimated that the CIS stopped at the white portion 182 (rear white reference plate).

[0144] Also, the CIS must be located within a range of 1 to 5 mm from the right end of the white portion 182 shown in FIG. 7, and the surface of the reading glass 11 must be white.

[0145] When the power detection unit 161 detected that the power supply unit 2 had turned on the power supply, the CIS detected the white portion 182 or the white portion 184 of the reference plate 18 .

[0146] The drive control unit 164 moves the CIS 15 mm to the left. The CIS detects the black portion 180 of the reference plate 18.

[0147] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0148] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0149] In pattern 4, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be on the reading glass 11 side shown in FIG. 2 rather than the home position 17 when the DP 3 is closed relative to the housing 10 of the reading device 1.

[0150] 7 and 8, in pattern 2, it is estimated that the CIS stopped at the white portion 182 (rear white reference plate).

[0151] Also, the CIS must be located within a range of 5 to 17.9 mm from the right end of the white portion 182 shown in FIG. 7, and the surface of the reading glass 11 must be white.

[0152] When the power detection unit 161 detected that the power supply unit 2 had turned on the power supply, the CIS detected the white portion 182 or the white portion 184 of the reference plate 18 .

[0153] The drive control unit 164 moves the CIS 15 mm to the left. The CIS detects the white portion 182 or the white portion 184 of the reference plate 18.

[0154] The drive control unit 164 moves the CIS 25 mm to the right. The CIS detects the white portion 182 or the white portion 184 of the reference plate 18.

[0155] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0156] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0157] In pattern 5, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be on the reading glass 11 side shown in FIG. 2 rather than the home position 17 when the DP 3 is closed relative to the housing 10 of the reading device 1.

[0158] 7 and 8, in pattern 5, it is estimated that the CIS stopped at the white portion 182 (rear white reference plate).

[0159] When the power detection unit 161 detected that the power supply unit 2 had turned on the power supply, the CIS detected the white portion 182 or the white portion 184 of the reference plate 18 .

[0160] Also, the CIS must be located within a range of 5 to 17.9 mm from the right end of the white portion 182 shown in FIG. 7, and the surface of the reading glass 11 must be black.

[0161] The drive control unit 164 moves the CIS 15 mm to the left. The CIS detects the black portion 180 of the reference plate 18.

[0162] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0163] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0164] In pattern 6, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be below the reading glass 11 shown in FIG. 2 rather than the home position 17 when the DP 3 is closed relative to the housing 10 of the reading device 1.

[0165] 7 and 8, in pattern 2, it is estimated that the CIS was stopped at the white portion 182 (rear white reference plate), and the condition is that the surface of the reading glass 11 is white.

[0166] When the power detection unit 161 detected that the power supply unit 2 had turned on the power supply, the CIS detected the white portion 182 or the white portion 184 of the reference plate 18 .

[0167] The drive control unit 164 moves the CIS 15 mm to the left. The CIS detects the white portion 182 or the white portion 184 of the reference plate 18.

[0168] The drive control unit 164 moves the CIS 25 mm to the right. The CIS detects the white portion 182 or the white portion 184 of the reference plate 18.

[0169] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0170] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0171] Next, as shown in FIG. 9, in pattern 7, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to have been located closer to the document glass 12 side shown in FIG. 2 than the home position 17 when the DP3 is closed relative to the housing 10 of the reading device 1.

[0172] 7 and 9, in pattern 7, it is estimated that the CIS stopped at the black portion 185.

[0173] 7. Also, the condition is that the CIS does not enter the specific color section 186 even if it is moved 45 mm to the right from the black section 185 shown in FIG.

[0174] When the power detection unit 161 detected that the power supply unit 2 had turned on the power supply, the CIS detected the black portion 185 of the reference plate 18 .

[0175] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0176] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0177] In pattern 8, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be on the document glass 12 side shown in FIG. 2 rather than the home position 17 when the DP 3 is closed relative to the housing 10 of the reading device 1.

[0178] 7 and 9, in pattern 8, it is estimated that the CIS stopped at the black portion 185.

[0179] 7. Also, the condition is that the CIS enters the specific color section 186 when it moves 45 mm to the right from the black section 185 shown in FIG.

[0180] When the power detection unit 161 detected that the power supply unit 2 had turned on the power supply, the CIS detected the black portion 185 of the reference plate 18 .

[0181] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the specific color portion 186 of the reference plate 18.

[0182] The drive control unit 164 moves the CIS to the left by 248 mm. The CIS detects the black portion 185 of the reference plate 18.

[0183] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0184] In pattern 9, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be on the reading glass 11 side shown in FIG. 2 rather than the home position 17 when the DP 3 is closed relative to the housing 10 of the reading device 1.

[0185] 7 and 8, in pattern 9, it is estimated that the CIS stopped at the black portion 183.

[0186] When the power detection unit 161 detected that the power supply unit 2 had turned on the power supply, the CIS detected the black portion 183 of the reference plate 18 .

[0187] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0188] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0189] In pattern 10, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be closer to the reading glass 11 shown in FIG. 2 than the home position 17 when the DP 3 is closed relative to the housing 10 of the reading device 1.

[0190] 7 and 9, in pattern 10, the CIS is stopped under the reading glass 11, and the top of the reading glass 11 is black.

[0191] When the power detection unit 161 detects that the power supply unit 2 has turned on the power supply, the CIS detects the black color on the reading glass 11 .

[0192] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0193] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0194] In pattern 11, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be on the document glass 12 side shown in FIG. 2 rather than the home position 17 when the DP 3 is closed relative to the housing 10 of the reading device 1.

[0195] 7 and 9, in pattern 11, it is estimated that the CIS was stopped under the specific color portion 186.

[0196] When the power detection unit 161 detected that the power supply unit 2 had turned on the power supply, the CIS detected the specific color portion 186 of the reference plate 18 .

[0197] The drive control unit 164 moves the CIS to the left by 248 mm. The CIS detects the black portion 180 of the reference plate 18.

[0198] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0199] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0200] In pattern 12, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be below the reading glass 11 shown in FIG. 2 rather than the home position 17 when the DP 3 is closed relative to the housing 10 of the reading device 1.

[0201] 7 and 9, in pattern 12, the CIS is stopped under the reading glass 11, and the specific color portion 186 is on the reading glass 11. In FIG.

[0202] When the power detection unit 161 detected that the power supply unit 2 had turned on the power supply, the CIS detected the specific color portion 186 of the reference plate 18 .

[0203] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0204] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0205] Next, FIG. 10 shows patterns 20 to 25 in which the drive control unit 164 moves the CIS of the sheet reading device 100 to the home position 17 when the position of the CIS when the power detection unit 161 detects that the power is turned off is not the home position 17, and it is estimated that the CIS was on the reading glass 11 side or the document glass 12 side.

[0206] As shown in Figure 10, in pattern 20, as shown in Figure 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to have been located closer to the reading glass 11 shown in Figure 2 than the home position 17 when the DP3 is closed relative to the housing 10 of the reading device 1.

[0207] 7 and 10, in pattern 20, it is estimated that the CIS stopped at white portion 182 or white portion 184.

[0208] When the power detection unit 161 detected that the power supply unit 2 had turned on the power supply, the CIS detected the white portion 182 or the white portion 184 of the reference plate 18 .

[0209] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0210] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0211] In pattern 21, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be on the reading glass 11 side shown in FIG. 2 rather than the home position 17 when the DP 3 is closed relative to the housing 10 of the reading device 1.

[0212] 7 and 10, in pattern 21, it is estimated that the CIS stopped at black portion 183.

[0213] When the power detection unit 161 detected that the power supply unit 2 had turned on the power supply, the CIS detected the black portion 183 of the reference plate 18 .

[0214] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0215] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0216] In pattern 22, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be on the reading glass 11 side shown in FIG. 2 rather than the home position 17 when the DP 3 is closed relative to the housing 10 of the reading device 1.

[0217] 7 and 10, in pattern 22, when the power detection unit 161 detects that the power supply unit 2 has turned on the power supply, the CIS detects the specific color portion 186 of the reference plate 18. In FIG.

[0218] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0219] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0220] In pattern 23, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be on the document glass 12 side shown in FIG. 2 rather than the home position 17 when the DP3 is closed relative to the housing 10 of the reading device 1.

[0221] When the power detection unit 161 detected that the power supply from the power supply unit 2 was turned on, the CIS detected the white portion 182 or the white portion 184 .

[0222] The drive control unit 164 moves the CIS 15 mm to the left. The CIS detects the white portion 182 of the reference plate 18.

[0223] The drive control unit 164 moves the CIS 45 mm to the right. The CIS detects the black portion 185 of the reference plate 18.

[0224] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0225] In pattern 24, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be on the document glass 12 side shown in FIG. 2 rather than the home position 17 when the DP3 is closed relative to the housing 10 of the reading device 1.

[0226] 7 and 10, in pattern 24, when the power detection unit 161 detects that the power supply unit 2 has turned on the power supply, the CIS detects the black portion 185 of the reference plate 18. In FIG.

[0227] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0228] In pattern 25, as shown in FIG. 1, the estimated position of the CIS when the power detection unit 161 detects that the power supply by the power supply unit 2 has been turned off is estimated to be on the document glass 12 side shown in FIG. 2 rather than the home position 17 when the DP 3 is closed relative to the housing 10 of the reading device 1.

[0229] 7 and 10, in pattern 10, when the power detection unit 161 detects that the power supply unit 2 has turned on the power supply, the CIS detects the specific color portion 186 of the reference plate 18. In FIG.

[0230] The drive control unit 164 moves the CIS to the left by 248 mm. The CIS detects the black portion 185 of the reference plate 18.

[0231] The drive control unit 164 moves the CIS to the home position 17 based on the fact that the CIS is located in the black portion 185 .

[0232] Next, the storage unit 162 stores therein first flag information for prohibiting the determination unit 163 from performing the determination process.

[0233] When the drive control unit 164 detects that the power supply from the power supply unit 2 has been turned on, the drive control unit 164 performs control so as to adjust the position of the light emitting unit 130 based on the first flag information.

[0234] According to this embodiment, as an example, when the sheet reading device 100 is shipped from the factory, first flag information that prohibits the determination unit 163 from determining whether the stopping position of the light-emitting unit 130 was the home position is stored in the memory unit 162.

[0235] When the drive control unit 164 detects that the power supply unit 2 has turned on the power supply for the first time after the sheet reading device 100 is shipped from the factory, the drive control unit 164 executes position adjustment of the light emitting unit 130.

[0236] Therefore, even if the position of the light-emitting unit 130 is displaced from the home position 17 due to transportation after the sheet reading device 100 is shipped from the factory, the position adjustment of the light-emitting unit 130 is performed at the timing when the drive control unit 164 first detects that the power supply from the power supply unit 2 is turned ON. Therefore, the position of the light-emitting unit 130 is suitably adjusted to the home position 17 before the sheet reading device 100 is used.

[0237] After controlling the position adjustment of the light-emitting unit 130 based on the first flag information, the drive control unit 164 rewrites the first flag information in the memory unit 162 to second flag information that permits the determination unit 163 to execute the determination process.

[0238] After the first flag information stored in the memory unit 162 is rewritten to the second flag information, the judgment unit 163 can judge whether the stopping position of the light emitting unit 130 was the home position when the power detection unit 161 detected that the power supply by the power supply unit 2 was turned off.

[0239] Next, a reading method according to this embodiment will be described with reference to Fig. 11 and Fig. 12. Fig. 11 and Fig. 12 are flowcharts showing the reading method according to the embodiment of the present invention. In Fig. 11 and Fig. 12, the light-emitting unit 130 is also referred to as CIS.

[0240] As shown in Fig. 11, the flowchart includes steps S10 to S18. As shown in Fig. 12, the flowchart includes steps S20 to S26.

[0241] 11, the position detection unit 160 detects the position of the light emitting unit 130. The process proceeds to step S11.

[0242] In step S11, the storage unit 162 stores the position of the CIS.

[0243] In step S12, the power supply unit 2 turns off the power supply to the CIS. The process proceeds to step S13.

[0244] In step S13, determination unit 163 determines whether memory unit 162 has stored information that the stop position of the CIS was home position 17, or that it was on the reading glass 11 side or the document glass 12 side. If memory unit 162 has stored information that the stop position of the CIS was home position 17 (Yes), the process of step S13 proceeds to step S14. If memory unit 162 has stored information that the stop position of the CIS was on the reading glass 11 side or the document glass 12 side (No), the process of step S13 proceeds to step S20 shown in FIG.

[0245] If memory unit 162 has stored therein that the stop position of the CIS was home position 17 (Yes in step S13), power supply unit 2 turns on the power supply to the CIS in step S14. The process proceeds to step S15.

[0246] In step S15, the determination unit 163 determines whether or not the CIS was in the home position 17 when the power supply unit 2 turned off the power supply. If it is determined that the CIS was not in the home position 17 (No), the process proceeds to step S16. If it is determined that the CIS was in the home position 17 (Yes), the process proceeds to step S18.

[0247] If it is determined that the CIS is not at the home position 17 (No in step S15), in step S16, the position detection unit 160 performs position determination (position detection) using the reference plates 18 on both sides of the home position 17. The process proceeds to step S17.

[0248] In step S17, the drive control unit 164 moves the CIS to the home position 17. Then, the process ends.

[0249] If it is determined that the CIS was at home position 17 (Yes in step S15), in step S18, the drive control unit 164 does not perform position adjustment to move the CIS to home position 17. Then, the process ends.

[0250] Next, if memory unit 162 has stored that the stop position of the CIS was not home position 17 but was on the side of reading glass 11 or on the side of document glass 12 (No in step S13), in step S20 shown in Fig. 12, memory unit 162 stores that the stop position of the CIS was on the side of reading glass 11 or on the side of document glass 12. The process proceeds to step S21.

[0251] In step S21, the power supply unit 2 turns on the power supply to the CIS. The process proceeds to step S22.

[0252] In step S22, the determination unit 163 determines whether or not the CIS was in the home position 17 when the power supply unit 2 turned off the power supply. If it is determined that the CIS was not in the home position 17 (No), the process proceeds to step S23. If it is determined that the CIS was in the home position 17 (Yes), the process proceeds to step S26.

[0253] If it is determined that the CIS was not at home position 17 (No in step S22), in step S23, determination unit 163 determines whether memory unit 162 has stored information indicating that the stop position of the CIS was on the reading glass 11 side or the document glass 12 side. If memory unit 162 has stored information indicating that the stop position of the CIS was on the reading glass 11 side (Yes), the process proceeds to step S24. If memory unit 162 has stored information indicating that the stop position of the CIS was on the document glass 12 side (No), the process proceeds to step S25.

[0254] If it is stored that the stop position of the CIS is on the side of the reading glass 11 (Yes in step S23), in step S24, the position detection unit 160 performs position determination (position detection) using the reference plate 18 on the left side of the home position 17. The process returns to FIG. 11 and ends.

[0255] If it is stored that the stop position of the CIS is on the side of the document glass 12 (No in step S23), in step S25, the position detection unit 160 performs position determination (position detection) using the reference plate 18 on the right side of the home position 17. The process returns to FIG. 11 and ends.

[0256] If it is determined that the CIS was at home position 17 (Yes in step S22), in step S26, drive control unit 164 does not perform position adjustment to move the CIS to home position 17. The process returns to FIG. 11 and ends.

[0257] The embodiments of the invention have been described above with reference to the drawings. However, the present invention is not limited to the above embodiments, and can be implemented in various forms without departing from the spirit of the present invention. The drawings are mainly schematic illustrations of the respective components for ease of understanding, and the number of each component shown in the drawings may differ from the actual number due to the convenience of drawing. Furthermore, the components shown in the above embodiments are merely examples, and are not particularly limited, and various modifications are possible without substantially departing from the effects of the present invention. [Industrial Applicability]

[0258] The present invention can be used in the field of sheet reading devices and reading methods. [Explanation of symbols]

[0259] 100 Sheet reader 1 Reading device 11 Reading glass 12 Document glass 13 Carriage 130 Light emitting part (CIS) 132 Motor 15 Light receiving part 16 Control device 160 Position detection unit 161 Power detection unit 162 Storage section 163 Judgment section 164 Drive control unit 17 Home Position 18 Reference plate 2 Power supply section 3. Conveyor 34 Reading unit

Claims

1. A reading device for reading the sheet; a power supply unit for supplying power to the reading device; A sheet reading device comprising: The reading device is a light emitting unit that irradiates the sheet with irradiation light while moving relative to the sheet; a position detection unit that detects a position of the light emitting unit; a power detection unit that detects whether the power supply unit supplies power to the power supply unit, and A storage unit that stores a stop position of the light emitting unit when the OFF is detected; a drive control unit that controls whether or not to adjust the position of the light-emitting unit based on the stop position when the power detection unit detects the ON state; a determination unit that determines whether the stop position is a home position; having The drive control unit controls the sheet reading device so as not to perform the position adjustment when the power detection unit detects the ON state, based on a determination result that the stop position is the home position.

2. The sheet reading device according to claim 1 , wherein the drive control unit controls to perform position adjustment to move the light-emitting unit to the home position when the power detection unit detects the ON state based on a determination result that the stop position is not the home position.

3. The reading device is a document glass on which the sheet is placed; a reference plate that is disposed parallel to the document glass and extends parallel to the moving direction of the light emitting unit; and The sheet reading device of claim 1, wherein when the stop position is a position opposite the document glass, the drive control unit controls the light-emitting unit to move when the power detection unit detects the ON, and performs position adjustment to move the light-emitting unit to the home position based on at least a combination of the color of the reference plate corresponding to the stop position and the color of the reference plate corresponding to the destination of the light-emitting unit.

4. The sheet conveying apparatus further includes a conveying device for conveying the sheet, The reading device is a reading glass through which the sheet passes; a reference plate disposed parallel to the reading glass and extending parallel to the moving direction of the light emitting unit; Further equipped with The sheet reading device of claim 1, wherein when the stop position is a position opposite the reading glass, the drive control unit controls the light-emitting unit to move when the power detection unit detects the ON, and performs position adjustment to move the light-emitting unit to the home position based on at least a combination of the color of the reference plate corresponding to the stop position and the color of the reference plate corresponding to the destination of the light-emitting unit.

5. 5. The sheet reading device according to claim 3, wherein the reference plate has a white portion, a black portion, and a specific color portion other than the white portion and the black portion.

6. the storage unit stores first flag information for prohibiting the determination unit from performing a determination process; the drive control unit, when detecting the ON state, controls to execute the position adjustment based on the first flag information; 5. The sheet reading device according to claim 1, further comprising: a control unit that controls the position adjustment based on the first flag information, and then rewrites the first flag information to second flag information that permits execution of the determination process.

7. A step of irradiating light onto the sheet while a light emitting unit of a reading device moves relative to the sheet; reading the sheet based on light reflected from the sheet by the irradiated light; detecting that a power supply to the reading device is turned off; detecting a stop position of the light emitting unit when the OFF state is detected; storing said stop position; Detecting that the power supply is ON; determining whether the stop position was a home position; a step of controlling not to execute position adjustment when the ON is detected based on a determination result that the stop position is the home position; A reading method comprising:

Images