CN104580809B - Image forming apparatus, reading device and read method - Google Patents

Abstract

The invention provides an image forming device, a reading device and a reading method. An image forming apparatus according to an embodiment includes an image sensor extending in a main scanning direction, a carriage, a guide section, and a reading control section, the carriage moves in a sub-scanning direction perpendicular to the main scanning direction to change a reading position of a document, and the guide section It has a guide surface for guiding the document on the original glass. On the guide surface, a white part extending in the main scanning direction, a first colored part, and a second colored part are arranged in a row along the sub scanning direction. The first colored part has a low brightness. In the color of the brightness of the white part and the first coloring part extends along the main scanning direction, the second coloring part is a color of brightness lower than the brightness of the first coloring part and the second coloring part extends along the main scanning direction, the reading control part makes The carriage moves so that the reading position in the sub-scanning direction matches any one of the white portion, the first colored portion, and the second colored portion to perform a reading process.

Description

Image forming device, reading device and reading method

technical field

Embodiments described in this specification relate to an image forming apparatus, a reading apparatus, and a reading method in which paper is conveyed by an automatic document feeder of an image forming apparatus or a reading apparatus for reading processing.

Background technique

Conventionally, an image forming apparatus has an automatic document feeder (ADF) for reading a document when copying or scanning. When the automatic document feeder feeds and reads the document, the document placed on the automatic document feeder is passed through the upper surface of the document glass for the ADF. Then, the passing document is read by a reading mechanism formed of an exposure lamp, a mirror, an image sensor, and the like. With an image forming apparatus or a reading device having an automatic document feeder, a plurality of originals can be fed one by one to a reading position and the originals can be read continuously.

However, when the automatic document feeder feeds and reads the document, the image of the document may be blurred (白く飞ん). Especially thin lines and light (light) parts are prone to whitening. Therefore, the reproducibility of an image of an image generated by an automatic document feeder may be reduced depending on the content of the image.

Contents of the invention

An image forming apparatus according to an embodiment includes an automatic document conveying device that conveys a document to be read to a reading position on a document glass, and includes: an image sensor extending in a main scanning direction; a carriage extending along the When the main scanning direction is perpendicular to the sub-scanning direction, the carriage changes the reading position of the original; A white portion, a first colored portion, and a second colored portion are arranged in a scanning direction, the white portion is a white portion extending in the main scanning direction, and the first colored portion has a brightness lower than that of the white portion. and the first coloring portion extends along the main scanning direction, the second coloring portion is a color with a brightness lower than that of the first coloring portion and the second coloring portion extends along the main scanning direction. extending in the scanning direction; and a reading control section that moves the carriage such that a reading position in the sub-scanning direction matches any of the white portion, the first colored portion, and the second colored portion. One location for read processing.

Description of drawings

FIG. 1 is a longitudinal sectional view showing a schematic configuration of an image forming apparatus according to an embodiment.

2 is an enlarged view of a portion where a document is read by an automatic document feeder of the image forming apparatus according to the embodiment.

3 is a view of a platen guide which is a pressing member as viewed from the ADF original glass side (viewed in the Z-axis direction).

Fig. 4 is a schematic diagram of the relationship between the embossing guide and the reading position.

FIG. 5 is a schematic view showing the relationship between the stamp guide and the reading position when the reading position is changed.

FIG. 6 is a schematic view showing the relationship between the stamp guide and the reading position when the reading position is changed.

FIG. 7 is a functional block diagram for realizing processing functions of the image forming apparatus according to the embodiment.

FIG. 8 is a flowchart showing a reading flow.

Detailed ways

The image forming apparatus of this embodiment will be described. FIG. 1 is a longitudinal sectional view showing a schematic configuration of an image forming apparatus 1 in the present embodiment. FIG. 2 is an enlarged view of a portion R where a document is read by the automatic document feeder 50 of the image forming apparatus 1 . An example of the image forming apparatus according to the present embodiment is an MFP (Multi Functional Peripheral) having multiple functions such as a printing function, a copying function for scanning and printing a document, and a scanning function.

The image forming apparatus 1 includes a processor 2 , a memory 4 , an auxiliary storage device 6 , an operation panel 16 , an image forming unit 1A, a sheet supply unit 1B, an image reading unit 1C, and the like.

The processor 2 is a control device that controls various processes in the image forming section 1A, the sheet supply section 1B, the image reading section 1C, and the like. The processor 2 executes programs stored in the memory 4 and the auxiliary storage device 6 to realize various functions and perform processing.

As the processor 2 , a CPU (Central Processing Unit, central processing unit), an MPU (Micro Processing Unit, micro processing unit) capable of performing arithmetic processing equivalent to the CPU, or the like can be used. In addition, an ASIC (Application Specific Integrated Circuit, Application Specific Integrated Circuit) 7 serving as a processor may realize a part or all of the functions of the image forming apparatus 1 realized by the processor 2 .

The memory 4 stores programs for the processor 2 to execute image forming processing in the image forming section 1A, sheet supply processing in the sheet supply section 1B, image reading processing in the image reading section 1C, and the like. The so-called primary storage device. In addition, the memory 4 provides the processor 2 with a temporary work area. As memory 4, for example use RAM (Random Access Memory, random access memory), ROM (Read Only Memory, read only memory), DRAM (Dynamic Random Access Memory, dynamic random access memory), SRAM (Static Random Access Memory, static random access memory), VRAM (Video RAM, video memory), flash memory, etc.

The auxiliary storage device 6 stores various information in the image forming device 1 . The auxiliary storage device 6 can store, for example, image data generated by reading a document by the image reading unit 1C. As the auxiliary storage device 6 , for example, a magnetic storage device such as a hard disk drive, an optical storage device, a semiconductor storage device (flash memory, etc.), or a combination of these storage devices is used.

The operation panel 16 is an operation input means for performing operation input to the image forming apparatus 1 , and is also a display unit for displaying a setting screen or the like on the screen. The operation panel has a touch panel 16a, operation keys 16b, and the like. The touch panel 16a is operated and input while performing screen display. The operation keys 16b are physical keys for inputting various operations.

The image forming unit 1A performs processing of forming an image on a sheet during printing processing and copying processing. The image forming unit 1A forms an image on a sheet such as paper supplied from the sheet supply unit 1B based on a print job or a copy job.

The image forming section 1A has four process units 100 corresponding to yellow, magenta, cyan, and black, respectively, an intermediate transfer belt 8 as an image carrier, a secondary transfer roller 10 that is a transfer member, and a secondary transfer opposing roller 12 And discharge tray 32 and the like. In addition, the image forming unit 1A includes a fixing belt 20 , a fixing roller 26 , a pressure roller 22 and the like as a fixing device.

The sheet supply unit 1B supplies sheets to the image forming unit 1A. The sheet supply section 1B has a supply cassette 40 , a pickup roller 42 , a conveyance roller 44 , and the like. An image forming apparatus having four supply cassettes 40 and pickup rollers 42 is shown in FIG. 1 .

The image reading unit 1C is a device that reads an image from a document when copying or scanning, and is an image reading device including a copier, an image scanner, and the like. The image reading unit 1C is composed of an automatic document feeder (ADF) 50 , a scanner unit, and the like.

The automatic document feeder 50 of the image reading unit 1C is a device that continuously feeds the originals one by one to the reading position so that the originals can be scanned continuously. In addition, when the automatic document feeder 50 has a conveyance path for scanning both sides of the original document, it can scan both sides of the original document by passing the original document through the conveyance path for double-sided scanning, and feeding it in a turn if necessary. noodle. The automatic document feeder 50 of this embodiment includes a document table 52 , a transport path 54 , a pre-scan roller pair 55 , a post-scan roller pair 56 , a stamp guide 58 as a guide, and a discharge tray 70 .

In addition, the scanning unit reads a document conveyed by the automatic document feeder 50 . The scanning unit is composed of a CCD sensor which is an image sensor, a carriage 62 , an ADF document glass 60 , a carriage driving mechanism for moving the carriage 62 , and the like. In addition, when the upper cover on which the automatic document feeder 50 is attached is opened and a document is placed on the document glass, the scanning unit may scan the carriage 62 in the sub-scanning direction to read the document on the document glass.

The document placement table 52 is a table on which documents read by the automatic document feeder 50 are placed. The document placed on the document placement table 52 is picked up by the pickup roller and transported to the reading position through the transport path 54 .

The pre-reading roller pair 55 is a pair of conveyance rollers located upstream in the conveyance direction of the document relative to the document reading position. The pair of post-scan rollers 56 is a pair of conveyance rollers located on the downstream side in the conveyance direction of the document relative to the read position. The platen guide 58 serving as a guide guides the document conveyed to the reading position to the glass surface of the ADF document glass 60 . The original is guided to the ADF original glass 60 by the platen guide 58 , and the original passes close to the upper surface of the glass surface, so that the scanner can accurately read the original. The stamp guide portion 58 forms a curved surface that curves toward the ADF original glass 60 in the cross section (cross section on the X-Z plane) shown in FIGS. 1 and 2 . The platen guide 58 in this embodiment is a curved metal plate member, but there are no particular limitations on its shape, structure, or material as long as it has a guide surface that guides the original to adhere to the ADF original glass 60 . The imprint guide 58 of this embodiment will be specifically described below.

Then, an optical system for reading a document conveyed by the automatic document feeder 50 and passing over the ADF document glass 60 is attached to the carriage 62 . When the carriage 62 moves, the reading position changes. In this embodiment, as shown by the arrow B in FIG. 2 , the light emitted by the exposure lamp 64 of the carriage 62 hits the original at the reading position and is reflected, and the reflected light is guided to the CCD sensor by a plurality of mirrors such as the mirror 66. to read the original. The position where the light guided to the CCD sensor hits the document is the position where the automatic document feeder 50 reads the document.

The carriage 62 is guided by, for example, a guide rail, and can be scanned in the X-axis direction along the guide rail by a carriage driving mechanism. The CCD sensor extends in the main scanning direction (Y-axis direction in FIG. 1 ), and the carriage 62 can move in a sub-scanning direction perpendicular to the main scanning direction. Therefore, the reading position formed by the carriage 62 may be any position in the sub-scanning direction. In the present embodiment, when the document is read by the automatic document feeder 50 , the carriage 62 is moved to a position facing the document glass 60 for the ADF, and the document passing through the glass surface is read.

The carriage 62 may also have a reflection plate (reflector) or the like for efficiently irradiating the document surface with light from the exposure lamp 64 . The carriage drive mechanism has a motor, a carriage wire that transmits the rotation of the motor to the carriage, and the like.

Hereinafter, the imprint guide part 58 which is a guide part is demonstrated concretely. The platen guide 58 of the present embodiment is colored such that the color of the guide surface facing the ADF original glass 60 differs depending on the position in the conveyance direction of the original. FIG. 3 is a view of the platen guide 58 viewed from the ADF original glass 60 side (as viewed in the Z-axis direction). As shown in FIG. 3 , the imprint guide part 58 according to this embodiment has a white part 58w, a gray part 58g which is a first colored part whose brightness is lower (darker) than the white part, and a second colored part whose brightness is lower than that of the first colored part. That is, the black portion 58b. The white portion 58w, the gray portion 58g, and the black portion 58b are formed in a strip shape along the Y-axis direction (main scanning direction), which is the longitudinal direction of the platen guide 58 . In addition, the white portion 58w, the gray portion 58g, and the black portion 58b are formed in order along the X-axis direction (sub-scanning direction). In this embodiment, as shown in FIG. 3 and the like, the white portion 58w is located at the center, the gray portion 58g is formed upstream of the white portion 58w in the document conveyance direction, and the black portion 58b is formed downstream of the white portion 58w. The order of the white portion 58w, the gray portion 58g, and the black portion 58b is not particularly limited. As shown in FIG. On the upstream side, the other one of the gray portion 58g and the black portion 58b is formed on the downstream side of the white portion 58w. This is because the movement distance from the position of the white portion 58w, which is the reading position of the normal position of the carriage 62, to each colored portion can be shortened.

In this way, the guide surface of the platen guide 58 facing the ADF original glass 60 has a color portion with a brightness lower than white, so that the color of the back of the original when the original is read by the carriage 62 can be formed to have a brightness lower than that of white. white color. Specifically, by moving the carriage 62 to change the reading position in the sub-scanning direction, the color of the imprint guide 58 at the reading position can be set to any of white, gray, and black.

Here, FIGS. 4 to 6 are schematic diagrams showing the relationship between the stamp guide 58 and the reading position when the reading position is changed. First, as shown in FIG. 4, when the reading position E is at the position of the white portion 58w of the stamp guide 58, the color of the stamp guide 58 behind the document at the reading position becomes white. Then, as shown in FIG. 5 , when the carriage 62 is moved so that the reading position E becomes the position of the gray portion 58g, the color of the stamp guide portion 58 on the back of the original becomes gray. Then, as shown in FIG. 6 , when the carriage 62 is moved so that the reading position E becomes the position of the black portion 58b, the color of the stamp guide portion 58 on the back of the document becomes black.

Therefore, in the present embodiment, by moving the carriage 62 to change the reading position, the color of the backside of the document can be changed not only to normal white but also to a color with a brightness lower than that of white. If the embossed guide 58 at the reading position E is a color whose brightness is lower than that of white, the reflectance of light from the exposure lamp 64 of the embossed guide 58 is lower than that of white. Therefore, reflection from the platen guide 58 can be reduced in cases where light is easily transmitted, such as when the paper of the document is thin. Image blurring can be prevented by reducing reflection from the embossed guide. In particular, when the original image contains thin lines or lightly colored images, if the reflected light from the stamp guide 58 is strong, blurring is likely to occur, and the reproducibility of copied images and scanned images may decrease.

Therefore, to prevent image blurring, the carriage 62 may be moved to perform reading so that the reading position E is located at a position where the brightness of the gray portion 58g and the black portion 58b are lower than that of white. In addition, when light is easily transmitted when the paper is thin, if the emboss guide 58 is a black portion 58b, the copied image will be dark (black fogging occurs), so the reading position E is preferably positioned in the gray portion. 58g position. In this way, it is possible to ensure the reproducibility of parts that tend to blur, such as thin lines, and to prevent black fogging, and to perform copying and scanning processes with high image quality. When reading a document that is not likely to be fogged, such as a thick document, it is only necessary to position the reading position E at the black portion 58b.

The widths of the white portion 58w, the gray portion 58g, and the black portion 58b in the document conveyance direction are not particularly limited, and may be about 2 mm to 3 mm.

In addition, the white portion 58w, the gray portion 58g, and the black portion 58b are preferably formed on the guide surface of the platen guide portion 58 in a range where the original is guided so as to be in close contact with the ADF original glass 60 . If the gray portion 58g or the like is formed at a position where the original document floats from the glass surface and this position is positioned as the reading position, the original document may not be read accurately at first.

Then, in the image forming apparatus 1 of the present embodiment, when the document is read by the automatic document feeder 50, the reading position is matched to any one of the white portion 58w, the gray portion 58g, and the black portion 58b. Then, reading is performed, and this processing will be described below. First, the functions for realizing the processing will be described. FIG. 7 is a functional block diagram showing functions of the image forming apparatus 1 according to the present embodiment.

The image forming apparatus 1 has a setting information acquisition unit 200 and a reading control unit 202 . These functional modules are realized by the processor 2 executing the reading processing program stored in the memory 4 and the auxiliary storage device 6 . In addition, ASIC7 can also realize some or all of these functions.

When the conditions set when the document is read by the image reading unit 1C are input on the operation panel 16 , the setting information acquiring unit 200 acquires the setting information. In the present embodiment, the setting information of the reading position of the carriage 62 when reading a document conveyed by the automatic document feeder 50 is acquired. Specifically, to prevent blurring or the like, an input to set the reading position of the document to the gray portion 58g or the black portion 58b is acquired. In practice, for example, a screen display is performed to select a blurring prevention mode (for example, “blurring prevention mode”). If the blurring prevention mode is selected, the setting information acquisition unit 200 acquires selection information indicating that the blurring prevention mode is selected.

In addition, if the blurring prevention mode is selected, information specifying either the gray portion 58g or the black portion 58b may be acquired. For example, on the operation panel 16 , a setting screen related to the thickness of the document, such as the basic weight of the document to be read, is displayed. Furthermore, the setting information acquiring unit 200 acquires input information on the document thickness. In this case, if the paper on which the document is input is thin paper, the reading position may be positioned at the gray portion 58g, and otherwise positioned at the black portion 58b. Alternatively, a screen may be displayed on the operation panel 16 for directly specifying either one of the gray portion 58g and the black portion 58b, and the setting information acquiring unit 200 may acquire information specifying one of them.

The reading control unit 202 controls the document reading process performed by the image reading unit 1C based on the setting information acquired by the setting information acquiring unit 200 . In the present embodiment, when the automatic document feeder 50 is used for reading, if the user inputs to prevent blurring, the reading control unit 202 changes the reading position of the document from the position of the normal white portion 58w to a low-brightness position. The reading process is performed after the position of the gray portion 58g or the black portion 58b of the white portion. As described above, when the document is specified to be thin, the reading control unit 202 may move the carriage 62 to position the reading position at the position of the gray portion 58g. In other cases (or when thick paper is designated), the reading control unit 202 may be positioned at the position of the black portion 58b. Therefore, in the present embodiment, in order to prevent blurring on the copied image and the scanned image, the reading position is positioned at the position of the gray portion 58g for a document of the first thickness. If the document is thicker than the first thickness If the thickness is the second thickness, the reading position is set at the position of the black portion 58b, and the reading process is performed.

The above is the functional block of the function for the automatic document feeder 50 of the image forming apparatus 1 of the present embodiment to perform the reading process. In addition, as shown in FIG. 7 , the image forming apparatus 1 may further include a document information acquiring unit 204 for acquiring information related to the thickness of the document from a document sensor that detects the thickness of the document. For example, when the document sensor detects that the thickness of the document is thinner than a predetermined thickness, the document information acquiring unit 204 acquires the information of the content through the document sensor. Then, the reading control unit 202 moves the carriage 62 to the gray portion 58g based on the information acquired by the document information acquiring unit 204 to perform a reading process. In addition, if it is detected that the thickness is thicker than a predetermined thickness, the reading control unit 202 moves the carriage 62 to the black portion 58b to perform a reading process. The document sensor may be a sensor that directly detects the thickness of the paper, may be a sensor that measures the grammage, or may be a sensor that detects the transmittance of light, or the like.

The flow of the reading process performed by the automatic document feeder 50 of the image forming apparatus 1 according to this embodiment will be described below. FIG. 8 is a flowchart illustrating the flow of reading processing.

First, the setting information acquiring unit 200 acquires setting information specifying the conditions of the reading process through the operation panel 16 (ACT 101 ). Specifically, the setting information acquisition unit 200 acquires setting information such as whether or not the blurring prevention mode is designated, and whether to read at any position of the gray portion 58g and the black portion 58b when the blurring prevention mode is designated. . For example, as described above, the information specifying the reading position is information specifying that the document is thin paper.

Then, the reading control unit 202 determines whether to perform blurring prevention processing based on the setting information acquired by the setting information acquiring unit 200 (ACT 102 ).

When the blurring prevention mode is specified (YES in Act 102 ), the reading control unit 202 determines whether or not the document is thin paper based on the setting information ( Act 103 ).

If it is judged to be thin paper (YES in ACT 103 ), the reading control unit 202 moves the carriage 62 to match the reading position with the position of the gray portion 58 g and executes the reading process (ACT 104 ). If it is determined that it is not thin paper (NO in ACT 103 ), the reading control unit 202 moves the carriage so that the reading position matches the position of the black portion 58 b and executes the reading process ( ACT 105 ).

On the other hand, when it is determined in Act 102 that blurring prevention processing has not been selected (No in Act 102), the reading control unit 202 executes a normal reading process of positioning the reading position at the position of the white portion 58w (Act 106 ).

The above is the flow of the reading process of the image forming apparatus 1 according to the present embodiment. Furthermore, as described in the description of the functional blocks in FIG. 4 , a sensor or the like may detect the thickness instead of user input, and determine whether to perform the reading process in the blurring prevention mode based on the detection result. In this case, the setting information processing in ACT 101 is not performed, and the document information acquiring unit 204 acquires information on the thickness of the document from the document sensor. Then, the reading control unit 202 determines whether to perform blurring prevention processing based on the information on the document thickness, and if executed, determines whether to perform the reading process with either the gray portion 58g or the black portion 58b as the reading position.

In addition, although the present embodiment has shown that the carriage 62 has the exposure lamp 66, the mirror 68, etc., as the configuration of the optical system related to the reading of the document by the image reading unit 1C, other mirrors may also be used. A structure that guides reflected light to an image sensor, that is, a CCD sensor, but is not limited thereto. For example, an integrated optical system in which an image sensor is attached to the carriage 62 may be used. If the image reading unit 1C has a carriage that can move in the sub-scanning direction and change the reading position, the reading process of the present embodiment can be applied.

Although the present embodiment has described the case where the function of implementing the invention is recorded in the device in advance, it is not limited to this, and the same function can also be downloaded to the device through the network, and the same function can also be stored. After the storage medium is installed in the device. The storage medium may be in any form as long as it can store a program such as a CD-ROM and can be read by the device. In addition, such pre-installed and downloaded functions can also be realized in cooperation with an OS (operating system) inside the device.

As described in detail above, according to the technology described in this specification, it is possible to provide a high-reproducibility copy and image that can more accurately reproduce the image of the original even if the original to be read contains thin lines or light-colored images. processed image forming device.

Although the embodiments of the present invention have been described, these embodiments are merely examples for explaining the present invention and are not intended to limit the scope of the present invention. The apparatus and methods described herein can be embodied in a variety of other ways. Moreover, within the scope not departing from the gist of the present invention, of course, some omissions, substitutions or modifications can be made to the devices and methods. The claims and their equivalents cover such forms or modifications falling within the scope and gist of the present invention.

Claims (6)

1. a kind of image forming apparatus, described image forming apparatus includes the original copy of reading object being delivered on original copy glass The auto document feeder of reading position, described image forming apparatus be characterized in that, including：

Imaging sensor extends along main scanning direction；

Balladeur train is moved along the sub-scanning direction with main scanning direction orthogonal, and the balladeur train changes the reading position of original copy；

Guide portion has the guide surface for guiding the original copy on the original copy glass, in the guide surface described in Sub-scanning direction arrangement form has the first colored portion, white portion and the second colored portion, and the white portion is along the main scanning The white portion of the white of direction extension, first colored portion are brightness less than the color of the brightness in the white portion and described the One colored portion extends along the main scanning direction, and second colored portion is face of the brightness less than the brightness of first colored portion Color and second colored portion extends along the main scanning direction；And

Control unit is read, moves the balladeur train, the reading position on the sub-scanning direction is made to coordinate the white portion, described Any one position in first colored portion and second colored portion is read out processing,

The reading control unit obtains the information in relation to original copy thickness, is first thickness in original copy based on the information got In the case of, the reading position is set in the position of first colored portion, is thicker than the first thickness in original copy In the case of two thickness,

The reading position is set in the position of second colored portion,

In the guide surface of the guide portion, the white portion be formed in first colored portion and second colored portion it Between.

2. image forming apparatus according to claim 1, which is characterized in that

The color of first colored portion is grey, and the color of second colored portion is black.

3. a kind of reading device, the auto document including the original copy of reading object to be delivered to the reading position on original copy glass is defeated Device is sent, the reading device is characterized in that, including：

Imaging sensor extends along main scanning direction；

Balladeur train is moved along the sub-scanning direction with main scanning direction orthogonal, and the balladeur train changes the reading position of original copy；

Guide portion has the guide surface for guiding the original copy on the original copy glass, in the guide surface described in Sub-scanning direction arrangement form has the first colored portion, white portion and the second colored portion, and the white portion is along the main scanning The white portion of the white of direction extension, first colored portion are brightness less than the color of the brightness in the white portion and described the One colored portion extends along the main scanning direction, and second colored portion is face of the brightness less than the brightness of first colored portion Color and second colored portion extends along the main scanning direction；And

Control unit is read, moves the balladeur train, the reading position on the sub-scanning direction is made to coordinate the white portion, described The position of any one in first colored portion and second colored portion is read out processing,

The reading control unit obtains the information in relation to original copy thickness, is first thickness in original copy based on the information got In the case of, the reading position is set in the position of first colored portion, is thicker than the first thickness in original copy In the case of two thickness,

The reading position is set in the position of second colored portion,

In the guide surface of the guide portion, the white portion be formed in first colored portion and second colored portion it Between.

4. reading device according to claim 3, which is characterized in that

The color of first colored portion is grey, and the color of second colored portion is black.

5. a kind of read method, the read method is the read method in image forming apparatus, described image forming apparatus bag Include the auto document feeder that the original copy of reading object is delivered to the reading position on original copy glass, and image forming apparatus Including：Imaging sensor extends along main scanning direction；Balladeur train is moved along the sub-scanning direction with main scanning direction orthogonal, described Balladeur train changes the reading position of original copy；Guide portion has the guide surface for guiding the original copy on the original copy glass, There are the first colored portion, white portion and the second colored portion along the sub-scanning direction arrangement form in the guide surface, it is described white Color portion is the white portion of the white extended along the main scanning direction, and first colored portion is that brightness is less than the white portion The color of brightness and first colored portion extends along the main scanning direction, second colored portion are brightness less than described the The color of the brightness of one colored portion and second colored portion extends along the main scanning direction, the feature of the read method exists In, including：

The balladeur train is moved, the reading position on the sub-scanning direction is made to coordinate the white portion, first colored portion With the position of any one in second colored portion,

Processing is read out in the reading position of setting,

The information in relation to original copy thickness is obtained,

Based on the information got, in the case where original copy is first thickness, the reading position is set in described first The position in color portion,

In the case of the second thickness that original copy is thicker than the first thickness, the reading position is set in described second The position in color portion,

In the guide surface of the guide portion, the white portion be formed in first colored portion and second colored portion it Between.

6. read method according to claim 5, which is characterized in that

The color of first colored portion is grey, and the color of second colored portion is black.