JP2001197269A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve operation efficiency by shortening the time from when an original cover is opened until pre-scanning and image reading are finished. SOLUTION: When the upper surface of an original platen 2 is opened after an optical unit 3 is stopped at a reference position P1, a light source lamp 5 is switched on, the unit 3 is made to move in the direction of the arrow A and to stop a reference position P2. Then, when the upper surface of the platen 2 is closed, the unit 3 is made to return and shading correction processing and pre-scanning processing are carried out. When the start of read processing is instructed, the unit 3 is made to move in the direction of the arrow A to perform image read processing of an original D. The unit 3 reaches the position P2, the read processing of the original image is completed, and when the upper surface of the platen 2 is closed after once opened, the unit 3 is made to move from the position P2 to the position P1. It is possible to start the read processing of the original image just after an instruction of an image read start is inputted and to improve the operation efficiency of the device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to an image reading apparatus for reading image data by scanning an image surface of a document.

[0002]

2. Description of the Related Art A copying machine for copying an image of a document is provided with an image reading device for reading the image of the document. The image forming apparatus includes a document table of a transparent glass body on which a document is placed on an upper surface, an optical unit that reciprocates in parallel with an image surface of the document and optically scans the image surface, and a driving mechanism that drives the optical unit. An image processing unit that receives reflected light from the image surface of the document to generate image data, and an image memory that stores the image data.

Some of such image reading apparatuses perform a so-called prescan in which an image surface of a document is scanned in advance by an optical unit prior to a process of reading image data from the document. This prescan determines whether the original placed on the platen is a color image or a monochrome image,
Detection of a character portion and a photograph portion in an image of a document, and
This is performed to detect the size and the position of the document. The copier uses the image data based on the detection data of the color image or the black-and-white image obtained by the prescan, the detection data of the character portion and the photo portion, and the detection data of the document size and the mounting position. Prior to the forming process, a function for setting image forming conditions and selecting a function to be used is selected.

As a conventional image reading apparatus, Japanese Patent Application Laid-Open No.
Japanese Patent Application Laid-Open No. 79884 discloses a method in which the pre-scan is started immediately when a document cover for covering the upper surface of a document table so as to be openable and closed is closed, thereby shortening the time until the first image forming process is started. A configuration for improving efficiency is disclosed.

[0005]

However, in the configuration disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 8-279888, the drive of the optical unit including the light source is started when the document cover is closed. In order to obtain accurate data from the original at the time of scanning, it is necessary to stably emit a predetermined amount of light from the light source, and the light amount of the light source is low and unstable when the temperature of the light source is low. However, the pre-scan cannot be started during the period from when the document cover is closed to when the light source temperature rises to the predetermined temperature, and there is a problem that the time until the image forming process is started becomes long.

In a conventional image reading apparatus including the configuration disclosed in the above-mentioned Japanese Patent Application Laid-Open No. Hei 8-279883, a single reference position is set within a reciprocating range of an optical unit parallel to an image surface of a document. Since prescanning and image reading were performed only while the optical unit moved forward from this reference position, it was necessary to reciprocate the optical unit two times during prescanning and image reading for one document. There is a problem that the time required for the reading process is lengthened and the operating efficiency is reduced.

An object of the present invention is to set a reference position for reciprocal movement at both ends of the reciprocal movement range of the optical unit, thereby setting a time from when the document cover is opened to when prescanning and image reading processing are completed. It is an object of the present invention to provide an image reading apparatus capable of improving the operation efficiency by shortening the operation time.

[0008]

The present invention has the following arrangement as means for solving the above-mentioned problems.

(1) An optical unit which reciprocates in parallel with the image plane of the document placed on the upper surface of the document table is provided, and the entire surface of the image plane of the document is exposed and scanned by light emitted from the light source of the optical unit. In the image reading apparatus, a detecting means for detecting the open / close state of the upper surface of the document table, and the optical unit is moved from one end in the reciprocating direction when the detecting means detects that the upper surface of the document table is opened before the start of the document reading process. And a control unit for performing a pre-scan process while moving to the other end side and thereafter moving from the other end side to the one end side. In this configuration, the optical unit moves from one end to the other end in the reciprocating direction when the upper surface of the document table is opened before the start of the original reading process, and thereafter, the optical unit moves from the other end to the one end. The pre-scan process is executed during the operation. Therefore, when the document reading process is performed while the optical unit moves from one end to the other end in the reciprocating direction, the prescan process and the document reading process are performed during one reciprocation of the optical unit,
The time required from the start of the prescan process to the end of the document reading process is reduced.

(2) The control unit stops the optical unit at one end in the reciprocating direction when the power to the apparatus is turned on and after the document reading process is completed.

In this configuration, the optical unit is stopped at one end in the reciprocating direction when the power of the apparatus is turned on and when the document reading process is on standby after the document reading process is completed. Therefore, when the upper surface of the document table is opened at the start of the document reading process, the optical unit first moves from one end to the other end in the reciprocating direction, and then moves from the other end to the one end. After the document reading process is performed during the movement from one end to the other end, the document moves from the other end to the one end. Thus, the prescan process and the document reading process are completed while the optical unit makes two reciprocations after the upper surface of the document table is opened.

(3) The detecting means detects an open / close state of the upper surface of the document table via an optical unit.

In this configuration, the open / close state of the upper surface of the document table is detected via the optical unit. Therefore, the open / closed state of the upper surface of the document table necessary for determining the reciprocating direction and the movement timing of the optical unit can be detected using the existing optical unit without complicating the configuration of the apparatus.

(4) The detecting means detects the open / close state of the upper surface of the document table based on the presence or absence of external light transmitted through the document table and incident on the optical unit.

In this configuration, the open / close state of the upper surface of the document table is determined by detecting the presence or absence of external light transmitted through the document table by the optical unit. Therefore, the open / close state of the upper surface of the document table is detected only by the optical unit already installed in the apparatus without adding new components.

(5) A shading correction member facing the optical unit is disposed at the other end in the reciprocating movement direction.

In this configuration, the optical unit that reaches the other end in the reciprocating direction faces the correction member for shading correction, and data for shading correction is detected via the optical unit. Therefore, when the optical unit moves from one end to the other end when the upper surface of the platen is opened, the data for shading correction is detected by the optical unit, and the optical unit makes two reciprocations after the upper surface of the platen is opened. While the shading correction process,
The prescan processing and the document reading processing are completed.

(6) The control unit includes a light source drive control unit that turns on the light source that is turned off when the detection unit detects that the upper surface of the document table has been opened.

In this configuration, the light source is turned on when the upper surface of the document table is opened during standby for document reading processing in which the light source of the optical unit is turned off. Therefore, if the upper surface of the document table is opened during standby for the document reading process, the optical unit moves from one end to the other end with the light source turned on before the prescan process is started. For this reason, the lighting of the light source is started at a timing sufficiently before the start timing of the prescan processing, and the irradiation light amount of the light source becomes sufficient at the time when the prescan processing is started.

[0020]

FIG. 1 is a schematic diagram showing the configuration of an image reading apparatus according to an embodiment of the present invention. The image reading device 1 is used as a scanner connected to an image data creation device such as a personal computer or a printer, or as a document scanner unit in a copying machine. The image reading device 1
An original table 2 made of a transparent glass body, an optical unit 3 arranged on the lower surface of the original table 2, and an original cover 4 for covering the upper surface of the original table 2 so as to be openable and closable are provided. A document D is placed on the upper surface of the document table 2 with the image surface facing down. The optical unit 3 includes a light source lamp 5, mirrors 6a to 6c, a lens 7, and a photoelectric conversion element (CCD) 8 while maintaining a positional relationship with each other, and arrows A and B parallel to the lower surface of the document table 2. It is reciprocally movable in the directions. The optical unit 3 exposes and scans the entire image surface of the document D with light emitted from the light source lamp 5 while moving the lower surface of the document table 2 in the direction of the arrow A or B. Is reflected on the light receiving surface of the CCD 8 via the mirrors 6a to 6c and the lens 7. The CCD 8 outputs an electric signal according to the amount of reflected light received on the light receiving surface.

A reflection member 9 for shading correction is attached on the upper surface of the document table 2 in the vicinity of the end side of the optical unit 3 in the forward direction (the other end in the reciprocating direction) in the direction of arrow A. . The reciprocating range of the optical unit 3 includes
The reference position P1 is set on the lower surface of the document table 2 at the end side (one end in the reciprocating direction) in the backward direction in the direction of arrow B, and the reference position P2 is set on the other end in the reciprocating direction. . The reference position P1 is a position serving as a reference for movement control when moving the optical unit 3 in the direction of arrow A. The reference position P2 is a reference position for movement control when the optical unit 3 is moved backward in the direction of arrow B. Also,
The reflection member 9 displays the standard white and the standard black for shading correction on the lower surface. Shading correction is performed based on the electric signal output from the optical unit 3 facing the lower surface of the reflection member 9.

The electric signal output from the CCD 8 of the optical unit 3 is subjected to A / D conversion and image processing in an image processing unit (not shown), and stored in an image memory as image data. The image data stored in the image memory is
It is output to an external printer or an image forming unit in a copying machine at a predetermined timing.

FIG. 2 is a diagram showing the change over time of the output signal of the CCD provided in the optical unit of the image reading apparatus.
FIG. 3A shows the CC when the document cover 4 is opened and closed with the light source lamp 5 of the optical unit 3 turned off.
FIG. 6B shows a change in the output signal of the CCD 8 when the document cover 4 is opened and closed while the light source lamp 5 of the optical unit 3 is turned on.

In a state where the light source lamp 5 of the optical unit 3 is turned off, while the document cover 4 closes the upper surface of the document table 2, the CCD 8 does not receive light.
The output signal (voltage signal) of the CCD 8 is substantially zero. When the upper surface of the document table 2 is opened at time ta in this state, external light such as illumination existing outside the image reading apparatus 1 passes through the document table 2 and enters the inside of the image reading apparatus 1. The part is received by the CCD 8 via the optical path in the optical unit 3. Therefore, the CCD 8 outputs a voltage signal corresponding to the intermediate gradation. Therefore, by setting a predetermined value lower than the output voltage of the CCD 8 receiving the external light as the threshold value th1, it can be determined that the upper surface of the document table 2 has been opened when the output voltage of the CCD 8 exceeds the threshold value th1. .

While the upper surface of the document table 2 is open while the light source lamp 5 of the optical unit 3 is turned on, the CCD 8 receives external light and a part of the light emitted from the light source lamp 5 optically. CC via optical path in unit 3
The light is received by D8, and the CCD 8 outputs a voltage signal corresponding to the intermediate gradation. In this state, when the upper surface of the document table 2 is closed by the document cover 4 at the time tb, the external light stops entering the inside of the image forming apparatus 1, but the light emitted from the light source lamp 5 is displayed in white on the document cover 4. The reflected light is transmitted through the document table 2 and received by the CCD 8 via the optical path in the optical unit 3. Therefore, the CCD 8 outputs a voltage signal corresponding to substantially the maximum gradation. Therefore, by setting a predetermined value slightly lower than the output voltage corresponding to the maximum gradation as the threshold value th2, it can be determined that the upper surface of the document table 2 is closed when the output voltage of the CCD 8 exceeds the threshold value th2. .

With the above configuration, the open / close state of the upper surface of the original table 2 by the original cover 4 can be performed using the optical unit 3 already provided in the image reading apparatus 1, and the open / close state of the upper surface of the original table 2 is detected. It is not necessary to separately provide a sensor or switch for this, and an increase in cost due to an increase in the number of parts can be prevented.

FIG. 3 is a block diagram showing the configuration of the control unit of the image reading apparatus. The control unit 11 of the image reading device 1 includes a CPU 1 having a ROM 13 and a RAM 14.
2, an image memory 15, an interface 16, an A / D converter 17, a motor driver 18, and a lamp driver 19
And the like. The interface 16 connects the CPU 12 to an external image data creation device, printer, or image forming unit. A / D converter 17
Is connected to the CCD 8, converts an output signal of the CCD 8 into digital data, and inputs the digital data to the CPU 12. The motor driver 18 drives the motor 10 based on the drive data output from the CPU 12. The lamp driver 19 drives the light source lamp 5 based on the drive data output from the CPU 12.

The CPU 12 controls and controls the input / output devices based on a program stored in the ROM 13 in advance, and temporarily stores data input / output during this time in the RAM 14. That is, the CPU 12 performs predetermined image processing on the output data of the CCD 8 input via the A / D converter 17 and stores the output data in the image memory 15, and the image data generating device, printer, or Transmit to the image forming unit. The CPU 12 outputs drive data for the motor 10 and the light source lamp 5 based on operation data on an operation panel (not shown) and output data from the CCD 8. More specifically, the CPU 12 is configured as shown in FIG.
Based on the relationship shown in (B), the open / close state of the document table 2 is detected from the output voltage of the CCD 8, and the detection result of the open / close state of the document table 2, the lighting state of the light source lamp 5, and the output voltage of the CCD 8 are obtained. The operation of the motor 10 is controlled accordingly. Note that the motor 10 supplies the optical unit 3 with a moving force during the reciprocating movement. Further, the control unit 12 detects a state in which the optical unit 3 is located at the reference position P1 or P2 via a detection member (not shown).

FIG. 4 is a flowchart showing a processing procedure in the control section of the image reading apparatus. When the power is turned on, the control unit 11 of the image reading apparatus 1
Is driven to stop the optical unit 3 at the reference position P1 (101), and based on the output signal of the CCD 8,
Waits for the upper surface of the to be opened (102). When the output signal of the CCD 8 exceeds the threshold th1 shown in FIG. 2A, the controller 11 determines that the document cover 4 has been opened to place a document on the upper surface of the document table 2, The light source lamp 5 is turned on on condition that the light source lamp 5 in the unit 3 is not turned on (103),
The optical unit 3 is moved forward in the direction of arrow A by driving the motor 10 to stop at the reference position P2 (104 to 10).
6). At this time, the control unit 11 sets a flag assigned to a memory area in the RAM 14 and stores that the light source lamp 5 is in a lighting state. During this time, the operator places a document on the upper surface of the document table 2.

Next, the control section 11 waits for the upper surface of the document table 2 to be closed based on the output signal of the CCD 8 (107). When the output signal of the CCD 8 exceeds the threshold th2 shown in FIG.
It is determined that the upper surface of the document table 2 has been closed, and on condition that the light source lamp 5 is lit, the motor 10 is driven with the reference position P2 as a reference to move the optical unit 3 back, and the prescan processing is performed. Execute (108, 109).
The control unit 11 stops driving the motor 10 when the optical unit 3 reaches the reference value P1 (110, 111).

This prescan processing is performed by the optical unit 3
Determining whether or not the original image is a color image based on a light receiving signal of the CCD 8 which has received the reflected light of the light of the light source lamp 5 on the image surface of the original D during the backward movement of the document D; A process of detecting a photo portion, and
It includes a process for detecting the size and the placement position of the document. In addition, after the optical unit 3 starts the backward movement, the control unit 11 performs shading correction based on the light receiving signal of the CCD 8 that has received the reflected light from the lower surface of the reflecting member 9 of the light of the light source lamp 5 prior to the prescan processing. Is performed. Note that the initial correction means setting of a shading correction value, a black and white balance correction value, and other gain adjustment values.

Thereafter, when the start of the reading process is instructed (112), the control unit 11 drives the motor 10 to move the optical unit 3 forward in the direction of arrow A (113). An image reading process of the document D is performed based on a light receiving signal of the CCD 8 that has received the light reflected on the image surface of the document D (114). When the optical unit 3 reaches the reference position P2, the control unit 11 stops driving the motor 10 (115, 116). The instruction to start the reading process is given by an input operation of an operator on an operation panel (not shown) provided in the image reading apparatus 1 or by transmitting a reading start command from the image data creating apparatus.

After the optical unit 3 reaches the reference position P2 and the reading of the original image is completed, the control unit 11 waits for the upper surface of the original table 2 to be opened. When the shading correction and the pre-scanning process are executed for all the documents to be exchanged every time, the control unit 11 controls the optical unit 3 when the upper surface of the document table 2 is once opened and then closed.
Is moved from the reference position P2 to the reference position P1 (117
→ 107-109). When the shading correction process and the pre-scan process are performed only on the first of a plurality of documents, the control unit 11 controls the optical unit when the upper surface of the document table 2 is opened after the reading process of the document image is completed. 3 is returned to the reference position P1, and the reading standby instruction is input (117, 118 → 112).

With the above processing, the optical unit 3 is moved from the reference position P1 to the reference position P2 while the light source lamp 5 is turned on when the operator opens the upper surface of the document table 2 to place a document. When the operator closes the upper surface of the document table 2, the optical unit 3 is moved from the reference position P2 to the reference position P1 while maintaining the lighting state of the light source lamp 5 to execute shading correction processing and pre-scan processing,
Further, when an instruction to start image reading is input, the optical unit 3 is moved from the reference position P1 to the reference position P2 to execute image reading processing. Therefore, the lighting of the light source lamp 5 can be started at a timing sufficiently earlier than the start timing of the shading correction processing and the pre-scan processing, and the shading correction processing and the pre-scan processing are performed in a state where the light amount of the light source lamp 5 is stable. Can be executed accurately. In addition, the shading correction process and the pre-scan process can be executed while the operator opens and closes the document cover 4 to place a document on the upper surface of the document table 2, and an instruction to start image reading is input. Immediately after that, the reading process of the document image is started, and the operation efficiency of the apparatus can be improved.

Note that the same processing as that shown in FIG. 4 can be performed even when the opening / closing state of the front of the document table 2 by the document cover 4 is detected using members such as sensors and switches. The above effects can be obtained.

FIG. 5 is a schematic diagram showing the configuration of an image reading apparatus according to another embodiment of the present invention. The image reading device 21 according to this embodiment is the same as the image reading device 1 shown in FIG.
As compared with the configuration of the above, only the reference position (home position) HP is set at one end of the reciprocating movement of the optical unit 3, and the reflection member 9 for shading correction is provided at one end of the reciprocating movement on the upper surface of the document table 2. The image reading apparatus 1 is attached, and a detection switch 22 for detecting the open / closed state of the document cover 4 is disposed on the upper surface. The image reading device 21
Has a control unit configured similarly to the control unit 11 of the image reading apparatus 1 shown in FIG. 3, and a detection signal of the detection switch 22 is input to the CPU 12. The CPU 12 determines whether the upper surface of the document table 2 is open or closed based on a detection signal of the detection switch 22.

FIG. 6 is a flowchart showing a processing procedure in the control section of the image reading apparatus according to another embodiment. When the power is turned on, the control unit 11 of the image reading device 21 drives the motor 10 to stop the optical unit 3 at the home position HP (121), and based on the detection signal of the detection switch 22, It waits for the upper surface of 2 to be opened (122). When the detection switch 22 changes from the on state to the off state, the control unit 11 determines that the document cover 4 has been opened to place a document on the upper surface of the document table 2, and determines that the light source lamp in the optical unit 3 has been opened. Under the condition that the light source lamp 5 is not turned on, the light source lamp 5 is turned on (123), and the motor 10 is driven to move the optical unit 3 in the direction of arrow A to execute the shading correction process (124, 125). ). At this time, the control unit 11 sets a flag assigned to a memory area in the RAM 14 and stores that the light source lamp 5 is in a lighting state. During this time, the operator places a document on the upper surface of the document table 2.

The control unit 11 moves the optical unit 3 to the other end position of the sheet of the maximum size readable by the apparatus (126, 127). During this time, if the operator places a document on the upper surface of the document table 2 and closes the document cover 4, the control unit 11 detects this state based on the detection signal of the detection switch 22 (128), and Then, the motor 10 is driven to move the optical unit 3 backward while the light is kept on, and the pre-scan process is executed (129, 130).
The control unit 11 determines that the optical unit 3 is in the home position HP
When the rotation of the motor 10 is reached, the driving of the motor 10 is stopped (131, 1
32).

The shading correction process (125)
And the pre-scan process (130)
9 has the same contents as the processing of FIG.

Thereafter, when the start of the reading process is instructed (133), the control unit 11 drives the motor 10 to move the optical unit 3 in the direction of arrow A (134). An image reading process of the document D is performed based on a light receiving signal of the CCD 8 which has received the reflected light of the light on the image surface of the document D (135). When the optical unit 3 reaches the other end position of the maximum size readable by the apparatus, the control unit 11 stops driving the motor 10 (136, 13).
7). Note that the instruction to start the reading process is indicated by 1 in FIG.
The processing is performed in the same manner as the processing of No. 12.

After the optical unit 3 reaches the other end position of the maximum size and the reading process of the original image is completed, the control unit 11
Waits for the upper surface of the document table 2 to be opened (13
8). When the shading correction and the pre-scan processing are performed for all the documents to be exchanged every time, the controller 11 moves the optical unit 3 to the home position HP when the upper surface of the document table 2 is once opened, and then performs the shading. Execute correction and pre-scan processing (13
8,139 → 124-130). When the shading correction process and the pre-scan process are performed only on the first of a plurality of documents, the control unit 11 controls the optical unit when the upper surface of the document table 2 is opened after the reading process of the document image is completed. 3 is returned to the home position HP and waits for the input of a reading start instruction (139 → 133).

According to the above-described processing, the image reading apparatus 21 according to the present embodiment is also configured such that the light source lamp 5 is turned on when the operator opens the upper surface of the document table 2 in order to place a document. Is moved forward from the home position HP to execute the shading correction process, and when the operator closes the upper surface of the document table 2, the optical unit 3 is returned to the home position HP while the lighting state of the light source lamp 5 is maintained. To perform pre-scan processing,
Further, when an instruction to start image reading is input, the optical unit 3 is moved forward from the home position to execute image reading processing. Therefore, the lighting of the light source lamp 5 can be started at a timing sufficiently earlier than the start timing of the pre-scan process, and the pre-scan process can be accurately executed in a state where the light amount of the light source lamp 5 is stable. . Further, the shading correction process and the pre-scan process can be performed while the operator opens and closes the document cover 4 to place the document on the upper surface of the document table 2.
Immediately after the image reading start instruction is input, the reading process of the document image can be started, and the operation efficiency of the apparatus can be improved.

[0043]

According to the present invention, the following effects can be obtained.

(1) When the upper surface of the document table is opened before the document reading process is started, the optical unit is moved from one end to the other end in the reciprocating direction, and then the optical unit is moved from the other end to one end. By performing the pre-scan process during the movement, when performing the document reading process while the optical unit moves from one end to the other end in the reciprocating movement direction,
The prescan process and the document reading process can be performed while the optical unit makes one reciprocation, and the time required from the start of the prescan process to the end of the document reading process can be reduced.

(2) By stopping the optical unit at one end in the reciprocating direction at the time of turning on the power to the apparatus and during standby of the original reading process after the end of the original reading process, When the upper surface of the document table is opened, the optical unit is first moved from one end in the reciprocating direction to the other end, and then the pre-scan process is executed while moving from the other end to the one end, After the document reading process is performed while moving from one end to the other end, the document is moved from the other end to the one end. Thus, the prescanning process and the document reading process can be completed while the optical unit is reciprocated twice after the upper surface of the document table is opened.

(3) By detecting the open / close state of the upper surface of the document table via the optical unit, the open / close state of the upper surface of the document table required for determining the reciprocating movement direction and the movement timing of the optical unit can be determined in the apparatus. By using the optical unit described above, detection can be performed without complicating the configuration of the device, and an increase in cost can be prevented.

(4) The open / close state of the upper surface of the platen is determined by detecting the presence or absence of external light transmitted through the platen by the optical unit, thereby determining the open / close state of the upper surface of the platen.
The detection can be performed only by the existing optical unit in the apparatus without adding a new part, and an increase in cost can be prevented.

(5) The upper surface of the document table is opened by detecting the data for shading correction via the optical unit by facing the optical unit reaching the other end in the reciprocating movement direction to the correction member for shading correction. When the optical unit is moved from one end side to the other end side when it is performed, data for shading correction can be detected by the optical unit, and while the optical unit reciprocates two times after the upper surface of the document table is opened, The shading correction processing, the pre-scan processing, and the document reading processing can be completed.

(6) By turning on the light source when the upper surface of the original table is opened during standby for original reading processing in which the light source of the optical unit is turned off, the upper surface of the original table is opened during standby for original reading processing. Then, the optical unit is moved from one end to the other end while the light source is turned on before the pre-scan processing is started. For this reason, the lighting of the light source can be started at a timing sufficiently before the start timing of the prescan processing, and the irradiation light amount of the light source can be made sufficient at the time when the prescan processing is started. Can be done accurately.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating a configuration of an image reading apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a CC included in an optical unit of the image reading apparatus.
FIG. 6 is a diagram showing a change over time of an output signal of D.

FIG. 3 is a block diagram illustrating a configuration of a control unit included in the image reading apparatus.

FIG. 4 is a flowchart illustrating a processing procedure in a control unit of the image reading apparatus.

FIG. 5 is a schematic diagram illustrating a configuration of an image reading apparatus according to another embodiment of the present invention.

FIG. 6 is a flowchart illustrating a processing procedure in a control unit of the image reading apparatus according to another embodiment.

[Explanation of symbols]

 1, 21-image reading device 2- original platen 3- optical unit 4- original cover 5- light source lamp 11- control unit

Continuation of the front page (72) Inventor Yoshihiko Kugen 22nd-22 Nagaikecho, Abeno-ku, Osaka City, Osaka F-term (reference) 5C072 AA01 BA05 CA02 CA12 DA12 FB12 LA02 LA08 MB05 MB06 WA01 WA04 XA01

Claims (6)

[Claims] An image is provided that includes an optical unit that reciprocates in parallel with an image surface of a document placed on an upper surface of a document table and that exposes and scans the entire image surface of the document by light emitted from a light source of the optical unit. In the reading device, detecting means for detecting the open / close state of the upper surface of the document table, and moving the optical unit from one end in the reciprocating movement direction when the detecting means detects that the upper surface of the document table is opened before the start of the document reading process. An image reading apparatus, comprising: a control unit that performs a pre-scan process while moving to the end side and thereafter moving from the other end side to the one end side. 2. The control unit according to claim 1, further comprising:
2. The image reading apparatus according to claim 1, wherein the optical unit is stopped at one end in the reciprocating direction after the document reading process is completed. 3. An image reading apparatus according to claim 1, wherein said detecting means detects an open / close state of an upper surface of the document table via an optical unit. 4. The image reading apparatus according to claim 3, wherein said detecting means detects the open / close state of the upper surface of the document table based on the presence or absence of external light transmitted through the document table and incident on the optical unit. apparatus. 5. The image reading apparatus according to claim 1, wherein a correction member for shading correction is disposed at the other end of said reciprocating movement direction, said correction member being opposed to said optical unit. 6. A light source drive control unit for turning on a light source that is turned off when the detection unit detects that the upper surface of the document table has been opened.
The image reading device according to any one of the above.