JP2013106058A - Image reading apparatus and image reading method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image reading apparatus capable of reading in a good condition contents printed on a paper document without damaging the paper document whose one side is bound.SOLUTION: First plane glass 111 on which one page of 2-spread pages in a paper document whose one side is bound is mounted; and second plane glass 112 on which the other page of the 2-spread pages is mounted are provided. An image reading apparatus comprises: v-shaped contact glass 110 having the first plane glass 111 and the second plane glass 112 which is arranged so that the cross section of the second plane glass 112 is v-shaped; a movement control part which moves a first mirror unit and a second mirror unit in a sub-scanning direction going to the second plane glass 112 from the first plane glass 111; and an image sensor which receives light reflected by the second mirror unit, and obtains image data of the page based on the received light.

Description

  The present invention relates to an image reading apparatus and an image reading method.

  Conventionally, as a method of obtaining electronic book data from a bound document, there is a method of scanning the content printed on paper using a scanner and converting it into data. You can scan a document with a back cover like a book by cutting the back cover, separating the pages, scanning each page, or opening the book on a flat bed (original platen). There is a method for scanning each page.

  However, when the spine is cut, there is a problem that the book is destroyed and cannot be restored. In addition, even when the book is placed on the flat bed with the book open, it is necessary to press the book to the flat bed with the book opened up to 180 degrees in order to accurately scan the vicinity of the binding portion of the book. There was a problem of damaging it. Furthermore, since it is difficult to completely open a book with a thickness of 180 degrees, there is a problem that there is a limit to accurately place the book on a flat bed in a spread state and to scan the vicinity of the binding portion.

  On the other hand, Patent Document 1 discloses a technique that employs a correction lens in the configuration of a scanner for the purpose of correcting a space generated between a book binding portion and a flat bed when scanning a book in a spread state. ing.

  However, in the technique of Patent Document 1, although a good copy can be obtained with a correction lens, there is a problem that damage to the book is not eliminated because the book is pressed against the flat bed in an open state.

  The present invention has been made in view of the above, and an image reading apparatus and an image that can read the content printed on a paper document in a good state without damaging the paper document bound on one side An object is to provide a reading method.

  In order to solve the above-described problems and achieve the object, the present invention is an image reading apparatus, and includes a first flat glass on which one of two spread pages of a paper document bound on one side is mounted. The second flat glass on which the other of the two spread pages is mounted, and the second flat glass is arranged such that the first flat glass and the second flat glass have a V-shaped cross section. A V-shaped contact glass having glass, a light source for irradiating light on a page mounted on the V-shaped contact glass, a first mirror unit and a second mirror unit for reflecting light from the light source, A movement control unit configured to move the first mirror unit and the second mirror unit in a sub-scanning direction from the first flat glass toward the second flat glass; and the first mirror unit and the front An image sensor that receives the light reflected by the second mirror unit each time the second mirror unit moves in the sub-scanning direction, and obtains image data of the page based on the received light; The movement control unit includes a first optical path from the position of the V-shaped contact glass on which the light reflected by the page is incident to the image sensor via the first mirror unit and the second mirror unit. The first mirror unit and the second mirror unit at each position in the sub-scanning direction so that the distance of each first optical path determined at each different position of the V-shaped contact glass is constant. The first movement control for controlling the position of is performed.

  The present invention is also an image reading apparatus, in which a first flat glass on which one of two spread pages of a paper document bound on one side is mounted and the other of the two spread pages are mounted. A V-shaped contact glass comprising: the first flat glass and the second flat glass disposed so that a cross section of the second flat glass is V-shaped; A light source that irradiates light on a page mounted on a V-shaped contact glass, a mirror unit that reflects light from the light source, a focus unit that adjusts the focus of light reflected by the mirror unit, and the focus unit And an image sensor for receiving image data of the page based on the received light.

  According to another aspect of the present invention, there is provided an image reading method executed in the image reading apparatus, the first flat glass on which one of two spread pages of a paper document bound on one side is mounted, and the two spread pages. V is a second flat glass on which the other page is mounted, and has the first flat glass and the second flat glass arranged so that the cross section of the second flat glass is V-shaped. An irradiation step of irradiating light on a page mounted on the letter-shaped contact glass, and a first mirror unit and a second mirror unit that reflect light from the light source from the first flat glass toward the second flat glass. A movement control step for moving in the scanning direction and an image sensor each time the first mirror unit and the second mirror unit move in the sub-scanning direction. A light receiving step of receiving light reflected by the unit and obtaining image data of the page based on the received light. In the movement control step, the V-shaped light on which the light reflected by the page is incident Is a first optical path from the position of the contact glass to the image sensor via the first mirror unit and the second mirror unit, and is determined at each different position of the V-shaped contact glass. The first movement control is performed to control the positions of the first mirror unit and the second mirror unit at each position in the sub-scanning direction so that the distance of the first optical path is constant.

  According to another aspect of the present invention, there is provided an image reading method executed in the image reading apparatus, the first flat glass on which one of two spread pages of a paper document bound on one side is mounted, and the two spread pages. V is a second flat glass on which the other page is mounted, and has the first flat glass and the second flat glass arranged so that the cross section of the second flat glass is V-shaped. The irradiation step of irradiating light on the page mounted on the letter-shaped contact glass, the focus adjustment step of adjusting the focus of the light reflected by the mirror unit that reflects the light from the light source, and the image sensor adjust the focus A light receiving step of receiving the received light and obtaining image data of the page based on the received light.

  According to the present invention, since the document table is made of a V-shaped contact glass, by placing a book spread page on the V-shaped contact glass, an area near the binding portion of the spread page is also in close contact with the V-shaped contact glass. Therefore, the content printed on the paper document can be read in a good state without pressing the facing page of the book against the document table. Further, it is not necessary to cut the back cover of the book, and it is not necessary to press the spread page of the book against the document table as described above, so that it is possible to reduce the damage to the book due to the scanning process.

FIG. 1 is an external view of the image reading apparatus according to the first embodiment. FIG. 2 is a diagram illustrating a main configuration related to scanning by the image reading apparatus. FIG. 3 is a block diagram illustrating a functional configuration of the processing unit. FIG. 4 is a diagram illustrating the reference region. FIG. 5 is a diagram showing identification information. FIG. 6 is a diagram for explaining the first movement control. FIG. 7 is a diagram for explaining the first movement control. FIG. 8 is a diagram for explaining the second movement control. FIG. 9 is a diagram illustrating a main configuration related to scanning of the image reading apparatus according to the second embodiment. FIG. 10 is a block diagram of a functional configuration of a processing unit according to the second embodiment.

  Hereinafter, embodiments of an image reading apparatus and an image reading method will be described in detail with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is an external view of an image reading apparatus 10 according to the first embodiment. The image reading apparatus 10 includes a flat contact glass 100 and a V-shaped contact glass 110 on which a sheet to be read is mounted. The V-shaped contact glass 110 is detachably mounted on the flat contact glass 100.

  The flat contact glass 100 is a document table provided in a flat shape, and has a main surface 102 on which a paper surface to be read is placed.

  The V-shaped contact glass 110 has a first flat glass 111 and a second flat glass 112. The first flat glass 111 and the second flat glass 112 are formed such that one side of both is joined and the cross section is V-shaped. In the present embodiment, the angle θ between the first flat glass 111 and the second flat glass 112 in the cross section of the first flat glass 111 and the second flat glass 112 is set to 90 °.

  The paper surface to be read is placed on the main surfaces outside the two main surfaces of the first flat glass 111 and the second flat glass 112, that is, the first main surface 113 and the second main surface 114. .

  The V-shaped contact glass 110 is a manuscript table suitable for scanning the contents of each page of a paper document 300 bound on one side such as a book (book). When scanning the paper document 300, the user matches the binding portion 302 of the paper document 300 with the joint portion of the first flat glass 111 and the second flat glass 112, and selects one of the two spread pages of the paper document 300. The paper document 300 is placed on the V-shaped contact glass 110 so that the page is in contact with the first main surface 113 and the other of the two spread pages is in contact with the second main surface 114.

  The V-shaped contact glass 110 has a V-shaped cross section of the first flat glass 111 and the second flat glass 112. Therefore, when the spread page of the paper document 300 is mounted on the V-shaped contact glass 110. The paper surface to be read does not float from the V-shaped contact glass 110 even in the vicinity of the binding portion 302 of the paper document 300, and the area near the binding portion 302 of each page is in close contact with the V-shaped contact glass 110. Can be made.

  The V-shaped contact glass 110 only needs to be formed so that its cross section is V-shaped, and the angle between the first flat glass 111 and the second flat glass 112 is limited to 90 °. It is not a thing. That is, the angle between the first flat glass 111 and the second flat glass 112 is such that the surface to be read does not float from the contact glass 110 even in the vicinity of the binding portion 302 of the paper document 300 with one side bound. I just need it.

  FIG. 2 is a diagram illustrating a main configuration related to scanning by the image reading apparatus 10. As shown in FIG. 2, the planar contact glass 100 includes a light source 120, a first mirror unit 130, a second mirror unit 140, and an image sensor 150. The second mirror unit 140 has mirrors 141 and 142.

  The light source 120 is provided under the flat contact glass 100 and irradiates light onto a paper surface to be read. The light source 120 moves from the first flat glass 111 to the second flat glass 112 (in the direction of arrow A in FIG. 2) along the surface direction of the flat contact glass 100 under the control of a light source control unit (not shown). Hereinafter, this direction is referred to as a sub-scanning direction. A direction parallel to the surface direction of the planar contact glass 100 and perpendicular to the sub-scanning direction is referred to as a main scanning direction.

  The light emitted from the light source 120 is reflected by the first mirror unit 130 and the second mirror unit 140 and then enters the image sensor 150 via a lens unit (not shown). The light source 120, the first mirror unit 130, and the second mirror unit 140 are all formed in a shape extending in the main scanning direction.

  The image sensor 150 obtains image data by photoelectrically converting the received light. Specifically, the image sensor 150 is a line sensor in which a plurality of light receiving elements are arranged in the main scanning direction, and is a CCD sensor, a CMOS sensor, or the like.

  FIG. 3 is a block diagram illustrating a functional configuration of the processing unit 160 included in the image reading apparatus 10. The processing unit 160 processes the image data obtained by the image sensor 150. The processing unit 160 includes a white balance adjustment unit 161, an image processing unit 162, a storage unit 163, an output unit 164, a V-shaped contact glass detection unit 165, and a movement control unit 166.

  The white balance adjustment unit 161 adjusts the white balance of the image data of each line obtained by the image sensor 150. As shown in FIGS. 1 and 2, the distance between the first main surface 113 and the second main surface 114 of the V-shaped contact glass 110 and the light source 120 is different at each position in the sub-scanning direction. For this reason, the amount of light irradiated on the paper surface is different at each position in the sub-scanning direction, and the brightness of the image data obtained by the image sensor 150 is different. The white balance adjustment unit 161 corrects this difference in brightness by white balance adjustment.

  More specifically, the white balance adjustment unit 161 adjusts the white balance of image data obtained from other regions with reference to reference image data obtained from a predetermined reference region of the V-shaped contact glass 110.

  FIG. 4 is a diagram illustrating the reference region. Thus, the reference region 115 is set near the end of the V-shaped contact glass 110. The white balance adjustment unit 161 uses the image data of the reference area 115 obtained by the image sensor 150 as a reference image. Note that the position of the reference region is not limited to the embodiment, and may be any position on the V-shaped contact glass 110.

  The image processing unit 162 in FIG. 3 performs predetermined image processing on the image data subjected to white balance adjustment, and stores the image data after the image processing in the storage unit 163. The output unit 164 outputs the image data stored in the storage unit 163.

  The V-shaped contact glass detection unit 165 detects the V-shaped contact glass 110 based on the image data obtained by the image sensor 150. Here, processing for detecting the V-shaped contact glass 110 will be described. FIG. 5 is a diagram showing the identification information 116. As shown in FIG. 5, identification information 116 for identifying the V-shaped contact glass 110 is printed in a predetermined area of the V-shaped contact glass 110. In the present embodiment, the identification information 116 is printed in the vicinity of the end of the V-shaped contact glass 110. However, the position of the identification information 116 is arbitrary and is not limited to the embodiment. Absent.

  The V-shaped contact glass detection unit 165 stores image data of the identification information 116 and its printing position. The V-shaped contact glass detection unit 165 collates the image data obtained from the image sensor 150 at the printing position with the previously stored identification information image data. It is determined that the contact glass 110 is mounted.

  The movement control unit 166 performs control for moving the light source 120, the first mirror unit 130, and the second mirror unit 140 in the sub-scanning direction. When the V-shaped contact glass 110 is detected by the V-shaped contact glass detecting unit 165, that is, when the V-shaped contact glass 110 is mounted on the flat contact glass 100, the movement control unit 166 is previously set. The predetermined first movement control is performed. In addition, the movement control unit 166 determines a first movement that is determined in advance when the V-shaped contact glass detection unit 165 does not detect the V-shaped contact glass 110, that is, when the V-shaped contact glass 110 is not mounted. Second movement control different from the control is performed. Here, the first movement control and the second movement control are the second mirror based on the first mirror unit 130 when the light source 120, the first mirror unit 130, and the second mirror unit 140 are moved in the sub-scanning direction. This is a process of adjusting the relative position of the unit 140.

  6 and 7 are diagrams for explaining the first movement control by the movement control unit 166. FIG. Assume that scanning is performed in the sub-scanning direction (the direction of arrow B). In this case, as the first mirror unit 130 and the second mirror unit 140 are moved in the sub-scanning direction, the distance from the first main surface 113 of the V-shaped contact glass 110 to the first mirror unit 130 increases. That is, the distance of the optical path (hereinafter referred to as the first optical path) from the first main surface 113 of the V-shaped contact glass 110 to the image sensor 150 via the first mirror unit 130 and the second mirror unit 140 is: As it moves in the sub-scanning direction, it becomes longer. For this reason, when moving in the B direction, the focus of the light incident on the image sensor 150 is shifted.

  Therefore, in the present embodiment, the first mirror unit 130 is moved in correspondence with the movement of the first mirror unit 130 and the second mirror unit 140 in the sub-scanning direction in order to keep the distance of the first optical path constant. First movement control is performed to change the relative position of the second mirror unit 140 as a reference. Specifically, in the first movement control, when scanning the paper surface placed on the first main surface 113, the second mirror unit 140 is moved when the first mirror unit 130 is moved by the movement distance l. The position of the second mirror unit 140 is adjusted so that the moving distance m is always l / 2.

6, the distance from the position C of the first main surface 113 to the first mirror unit 130 is c1, the distance from the first mirror unit 130 to the mirror 141 of the second mirror unit 140 is c2, and the mirror 141 Assuming that the distance from the mirror 142 to the mirror 142 is c3 and the distance from the mirror 142 to the image sensor 150 is c4, the first optical path L1 from the position C of the first main surface 113 to the image sensor 150 is calculated by (Equation 1). The
L1 = c1 + c2 + c3 + c4 (Formula 1)

Further, as shown in the lower part of FIG. 6, the distance from the position D of the first main surface 113 to the first mirror unit 130 is d1, the distance from the first mirror unit 130 to the mirror 141 of the second mirror unit 140 is d2, Assuming that the distance from the mirror 141 to the mirror 142 is d3 and the distance from the mirror 142 to the image sensor 150 is d4, the first optical path L2 from the position D of the first main surface 113 to the image sensor 150 is expressed by (Equation 2). Calculated.
L2 = d1 + d2 + d3 + d4 (Expression 2)

Here, as described above, by adjusting the position of the second mirror unit 140 so as to maintain the relationship of m = 1/2, as shown in (Equation 3), regardless of the position in the sub-scanning direction, The distance of the first optical path can always be kept constant.
c1 + c2 + c3 + c4 = d1 + d2 + d3 + d4 (Formula 3)

  In the first movement control, when the paper surface placed on the second main surface 114 is scanned, the movement distance m of the second mirror unit 140 is moved when the first mirror unit 130 is moved by the movement distance l. Is always equal to l.

7, the distance from the position E of the second main surface 114 to the first mirror unit 130 is e1, the distance from the first mirror unit 130 to the mirror 141 of the second mirror unit 140 is e2, and the mirror 141. If the distance from the mirror 142 to the mirror 142 is e3, and the distance from the mirror 142 to the image sensor 150 is e4, the first optical path L3 from the position E of the second main surface 114 to the image sensor 150 is calculated by (Equation 4). The
L3 = e1 + e2 + e3 + e4 (Formula 4)

7, the distance from the position F of the second main surface 114 to the first mirror unit 130 is f1, the distance from the first mirror unit 130 to the mirror 141 of the second mirror unit 140 is f2, When the distance from the mirror 141 to the mirror 142 is f3 and the distance from the mirror 142 to the image sensor 150 is f4, the first optical path L4 from the position F of the first main surface 113 to the image sensor 150 is expressed by (Equation 5). Calculated.
L4 = f1 + f2 + f3 + f4 (Formula 5)

Here, as described above, by adjusting the position of the second mirror unit 140 so as to keep the relationship of m = 1, as shown in (Equation 6), the first mirror unit 140 always has the first position regardless of the position in the sub-scanning direction. The distance of one optical path can be kept constant.
e1 + e2 + e3 + e4 = f1 + f2 + f3 + f4 (Formula 6)

  Thus, in the first movement control, the movement control unit 166 moves the first mirror unit 130 in response to moving the light source 120, the first mirror unit 130, and the second mirror unit 140 in the sub-scanning direction. Since the relative position of the second mirror unit 140 as a reference is changed, a change in the distance of the first optical path can be absorbed thereby, and the incident light enters the image sensor 150 regardless of the position in the sub-scanning direction. The focus of the light to be able to be always adjusted.

  Next, the second movement control by the movement control unit 166 will be described. FIG. 8 is a diagram for explaining the second movement control. In the second movement control, the distance of the optical path (hereinafter referred to as the second optical path) from the flat contact glass 100 to the image sensor 150 via the first mirror unit 130 and the second mirror unit 140 is kept constant. It is control for. Specifically, in the second movement control, the movement control unit 166 moves the first mirror unit 130 by the movement distance l when scanning the paper surface placed on the flat contact glass 100. The position of the second mirror unit 140 is adjusted so that the moving distance m of the two mirror units 140 is always 1/2.

8, the distance from the position G of the planar contact glass 100 to the first mirror unit 130 is g1, the distance from the first mirror unit 130 to the mirror 141 of the second mirror unit 140 is g2, and from the mirror 141, When the distance to the mirror 142 is g3 and the distance from the mirror 142 to the image sensor 150 is g4, the second optical path L5 from the position G of the planar contact glass 100 to the image sensor 150 is calculated by (Equation 7).
L5 = g1 + g2 + g3 + g4 (Expression 7)

8, the distance from the position H of the planar contact glass 100 to the first mirror unit 130 is h1, the distance from the first mirror unit 130 to the mirror 141 of the second mirror unit 140 is h2, and the mirror If the distance from 141 to the mirror 142 is h3 and the distance from the mirror 142 to the image sensor 150 is h4, the second optical path L6 from the position H of the flat contact glass 100 to the image sensor 150 is calculated by (Equation 8). The
L6 = h1 + h2 + h3 + h4 (Expression 8)

Here, as described above, by adjusting the position of the second mirror unit 140 so as to maintain the relationship of m = 1/2, as shown in (Equation 9), regardless of the position in the sub-scanning direction, The distance of the second optical path can always be kept constant.
g1 + g2 + g3 + g4 = h1 + h2 + h3 + h4 (formula 9)

  Thus, also in the second movement control, the movement control unit 166 determines the relative position of the second mirror unit 140 with respect to the first mirror unit 130 corresponding to the movement in the sub-scanning direction. Therefore, the change in the distance of the second optical path can be absorbed, and the light incident on the image sensor 150 can always be focused regardless of the position in the sub-scanning direction.

  As described above, the image reading apparatus 10 according to the present embodiment includes the V-shaped contact glass 110 having a shape along the opened state of a paper document bound on one side like a book. By placing a double-page spread to be read on the V-shaped contact glass 110 serving as a document table, an area near the binding portion of the opened page can be brought into close contact with the V-shaped contact glass 110 and opened. The contents of the page can be read in good condition.

  Further, in the image reading apparatus 10 according to the present embodiment, since the paper document is opened and placed on the manuscript table, it is not necessary to cut the back cover, and the V-shaped contact glass 110 as the manuscript table is provided. Since it is formed in a shape that matches the shape of the spread page, there is no need to press the paper document against the document table. For this reason, it is possible to prevent deterioration due to scanning of a paper document.

  A first modification of the image reading apparatus 10 according to the present embodiment will be described. In the image reading apparatus 10 according to the present embodiment, the V-shaped contact glass detection unit 165 detects the presence or absence of the V-shaped contact glass 110, and the movement control unit 166 performs the first movement control based on the detection result. However, instead of this, the movement control unit 166 may switch between the first movement control and the second movement control based on an instruction from the user. In this example, the image reading apparatus further includes a receiving unit that receives an input from the user. In this case, the image reading apparatus may not include the V-shaped contact glass detection unit 165.

  When the user wants to scan with the paper surface to be read placed on the V-shaped contact glass 110, the user mounts the V-shaped contact glass 110 on the flat contact glass 100 and gives an instruction to execute the first movement control. It inputs from an input part not shown. In addition, when the user wants to perform scanning by placing a paper surface to be read on the flat contact glass 100, the user removes the V-shaped contact glass 110 and inputs an instruction to execute the second movement control from the input unit.

  The accepting unit accepts an execution instruction of the first movement control or the second movement control input to the input unit, and the movement control unit performs the first movement control or the second movement control according to the execution instruction accepted by the accepting unit.

  As a second modification, the image reading apparatus may not include the flat contact glass 100. That is, the image reading apparatus includes only the V-shaped contact glass 110 as a document table. Thereby, the reduction | decrease in the light quantity of the light from the light source 120 at the time of passing the planar contact glass 100, and refraction of light can be reduced. Therefore, the image reading apparatus can obtain better image data. In this case, the V-shaped contact glass detecting unit 165 of the processing unit 160 may not be provided. Moreover, the movement control part 166 should just perform 1st movement control.

  As a third modification, the image reading apparatus may include three or more mirror units. Even in this case, the movement control unit 166 performs the first movement control and the second movement control so that the distance of each optical path passing through the mirror unit included in the image reading apparatus is constant.

(Second Embodiment)
FIG. 9 is a diagram illustrating a main configuration related to scanning of the image reading apparatus 20 according to the second embodiment. The image reading apparatus 20 according to the second embodiment includes a focus unit 170.

  In the image reading apparatus 10 according to the first embodiment, the distance of the optical path from the V-shaped contact glass 110 or the flat contact glass 100 to the image sensor 150 via the first mirror unit 130 and the second mirror unit 140 is determined. The focus of the light incident on the image sensor 150 is adjusted by the adjustment. However, in the image reading apparatus 20 according to the second embodiment, the focus of the light incident on the image sensor 150 is adjusted by the focus unit 170. To do. The image sensor 150 receives light whose focus has been adjusted by the focus unit 170, and obtains image data based on the received light.

  FIG. 10 is a block diagram illustrating a functional configuration of the processing unit 167 included in the image reading apparatus 20. The processing unit 167 includes a focus control unit 168 in addition to the functional configuration of the processing unit 160 of the first embodiment. The movement control unit 166 performs processing for moving the light source 120 and the mirror unit 180 in the sub-scanning direction.

  The focus control unit 168 adjusts the focus shift of light incident on the image sensor 150. Specifically, the focus control unit 168 detects the V-shaped contact glass 110 when the V-shaped contact glass detection unit 165 detects the V-shaped contact glass 110, that is, when the V-shaped contact glass 110 is mounted on the flat contact glass 100. First, predetermined first focus control is performed. Further, the movement control unit 166 determines a predetermined first focus when the V-shaped contact glass detection unit 165 does not detect the V-shaped contact glass 110, that is, when the V-shaped contact glass 110 is not mounted. Second focus control different from the control is performed.

  In the first focus control, the focus of light incident on the image sensor 150 due to a change in the distance of the optical path reaching the image sensor 150 from the first flat glass 111 or the second flat glass 112 via the mirror unit 180 is determined. This is a process for adjusting the deviation. The second focus control is a process of adjusting a focus shift of light incident on the image sensor 150 due to a change in a distance of an optical path reaching the image sensor 150 from the flat contact glass 100 via the mirror unit 180. .

  As described above, in the present embodiment, the relative positions of the plurality of mirror units are maintained so that the distance of the optical path of the light from the light source 120 is kept constant as in the image reading apparatus 10 according to the first embodiment. Instead of adjusting the focus, the focus of the light incident on the image sensor 150 is adjusted by the focus unit 170. As a result, the image forming apparatus 20 can always focus the light incident on the image sensor 150 regardless of the position in the sub-scanning direction.

  Note that the image reading apparatus described in the above embodiment may be applied to a multifunction machine having at least two functions among a copy function, a printer function, a scanner function, and a facsimile function. Further, the present invention can be applied to any image forming apparatus such as a copying machine.

10, 20 Image reader 100 Flat contact glass 110 V-shaped contact glass 111 First flat glass 112 Second flat glass 120 Light source 130 First mirror unit 140 Second mirror unit 150 Image sensor 160,167 Processing unit 161 White balance adjustment Unit 162 Image processing unit 163 Storage unit 164 Output unit 165 V-shaped contact glass detection unit 166 Movement control unit 168 Focus control unit 170 Focus unit 180 Mirror unit

JP-T-2005-534062

Claims (10)

A first flat glass on which one of the two spread pages of the paper document bound on one side is mounted; and a second flat glass on which the other of the two spread pages is mounted; A V-shaped contact glass having a flat glass and the second flat glass arranged so that a cross section of the second flat glass is V-shaped;
A light source for irradiating light on a page mounted on the V-shaped contact glass;
A first mirror unit and a second mirror unit that reflect light from the light source;
A movement control unit for moving the first mirror unit and the second mirror unit in a sub-scanning direction from the first flat glass toward the second flat glass;
Each time the first mirror unit and the second mirror unit move in the sub-scanning direction, the light reflected by the second mirror unit is received, and image data of the page is obtained based on the received light. An image sensor,
The movement control unit is configured to perform a first operation from the position of the V-shaped contact glass on which the light reflected by the page is incident to the image sensor via the first mirror unit and the second mirror unit. The first mirror unit and the second mirror at each position in the sub-scanning direction so that the distance of each first optical path determined at each different position of the V-shaped contact glass is constant. An image reading apparatus that performs first movement control for controlling a position of a unit. A flat contact glass provided between the V-shaped contact glass and the light source and mounted with the V-shaped contact glass;
The V-shaped contact glass is provided to be removable from the planar contact glass,
The first mirror unit and the second mirror from the position of the planar contact glass from which the light reflected by the page mounted on the planar contact glass is incident from the first movement control by the user from the first movement control. A second optical path to reach the image sensor via the unit, and each distance in the sub-scanning direction is constant so that the distance of each second optical path determined at each different position of the planar contact glass is constant. A receiving unit that receives a switching instruction to switch to the second movement control that controls the position of the first mirror unit and the second mirror unit at the position;
The image reading apparatus according to claim 1, wherein the movement control unit performs the second movement control when the receiving unit receives the switching instruction to the second movement control. A flat contact glass provided between the V-shaped contact glass and the light source and mounted with the V-shaped contact glass;
The V-shaped contact glass is detachably provided from the flat contact glass, and further has identification information printed on the first flat glass or the second flat glass,
A V-shaped contact glass detector that determines that the V-shaped contact glass has been removed from the planar contact glass when the image data of the identification information is obtained by the image sensor;
The movement control unit stops the first movement control when the V-shaped contact glass is removed, and the light reflected by the page mounted on the planar contact glass is incident on the planar contact glass. A second optical path from a position to the image sensor via the first mirror unit and the second mirror unit, and a distance of each second optical path determined at each different position of the planar contact glass 2. The image reading according to claim 1, wherein second movement control is performed to control positions of the first mirror unit and the second mirror unit at each position in the sub-scanning direction so as to be constant. apparatus.   The image reading apparatus according to claim 1, further comprising a white balance adjustment unit that adjusts a white balance of the image data obtained by the image sensor.   The white balance adjustment unit is obtained from a region other than the reference region of the V-shaped contact glass based on reference image data obtained from the predetermined reference region of the V-shaped contact glass by the image sensor. The image reading apparatus according to claim 4, wherein a white balance of the image data is adjusted. A first flat glass on which one of the two spread pages of the paper document bound on one side is mounted; and a second flat glass on which the other of the two spread pages is mounted; A V-shaped contact glass having a flat glass and the second flat glass arranged so that a cross section of the second flat glass is V-shaped;
A light source for irradiating light on a page mounted on the V-shaped contact glass;
A mirror unit that reflects light from the light source;
A focus unit for adjusting the focus of the light reflected by the mirror unit;
An image reading apparatus comprising: an image sensor that receives light whose focus is adjusted by the focus unit and obtains image data of the page based on the received light.   The image reading apparatus according to claim 6, further comprising a white balance adjustment unit that adjusts a white balance of the image data obtained by the image sensor.   The white balance adjustment unit is obtained from a region other than the reference region of the V-shaped contact glass based on reference image data obtained from the predetermined reference region of the V-shaped contact glass by the image sensor. The image reading apparatus according to claim 7, wherein a white balance of the image data is adjusted. An image reading method executed in an image reading apparatus,
A first flat glass on which one of the two spread pages of the paper document bound on one side is mounted; and a second flat glass on which the other of the two spread pages is mounted; An irradiation step of irradiating light onto a page mounted on a V-shaped contact glass having a flat glass and the second flat glass arranged so that a cross section of the second flat glass is V-shaped;
A movement control step of moving the first mirror unit and the second mirror unit that reflect light from the light source in a sub-scanning direction from the first flat glass toward the second flat glass;
The image sensor receives light reflected by the second mirror unit each time the first mirror unit and the second mirror unit move in the sub-scanning direction, and based on the received light, A light receiving step for obtaining image data,
In the movement control step, a first process from the position of the V-shaped contact glass on which the light reflected by the page is incident to the image sensor via the first mirror unit and the second mirror unit is performed. The first mirror unit and the first optical path at each position in the sub-scanning direction so that the distance of each first optical path determined at each different position of the sub-V-shaped contact glass is constant. An image reading method comprising performing first movement control for controlling the position of the two mirror units. An image reading method executed in an image reading apparatus,
A first flat glass on which one of the two spread pages of the paper document bound on one side is mounted; and a second flat glass on which the other of the two spread pages is mounted; An irradiation step of irradiating light onto a page mounted on a V-shaped contact glass having a flat glass and the second flat glass arranged so that a cross section of the second flat glass is V-shaped;
A focus adjustment step of adjusting the focus of the light reflected by the mirror unit that reflects the light from the light source;
An image reading method comprising: a light receiving step in which an image sensor receives light whose focus is adjusted, and obtains image data of the page based on the received light.

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