JP2008079101A - Image reading apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image reading apparatus capable of reducing cost and saving an occupied space and also capable of avoiding reduction or variation in the light quantity of a light source due to the temperature rising of the light source or trouble caused by the temperature rising of members disposed near a reading position. <P>SOLUTION: The image reading apparatus is provided with a document move reading mode during which a document image is read while illuminating the image of the document with a light source and feeding the document so as to pass a predetermined reading position at a fixed speed in a state where a scan optical system reading the image of the document at the reading position. In the image reading apparatus, a reading apparatus case comprises a heat conduction member which transports heat of a scan unit including the light source to the reading apparatus case in contact with the scan unit including the light source stopped at the reading position during the document move reading mode. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading apparatus used in an image forming apparatus such as a copying machine, a printer, or a facsimile employing an electrophotographic method, and in particular, a state in which reading means for reading an image of a document is stopped at a predetermined position Thus, the present invention relates to an image reading apparatus having a document moving reading mode in which an image of the document is read by a reading unit while the document is conveyed at a constant speed.

JP 2004-228706 A

  Conventionally, as an image reading apparatus used in an image forming apparatus such as a copying machine, a printer, or a facsimile employing such an electrophotographic system, an image of the original is placed on a platen glass. Is illuminated by a light source, and an image of an original is imaged on a reading element such as a CCD via an imaging lens in a state where the optical path is folded by one full-rate mirror and two half-rate mirrors. By moving a scanning optical system composed of a full rate mirror and a half rate mirror, an image of an original is read.

  In the image reading apparatus, the scanning optical system including the light source, the full-rate mirror, and the half-rate mirror is stopped at a predetermined reading position in addition to the fixed document reading mode in which the original is placed on the platen glass. In many cases, the apparatus is configured to include a document moving reading mode in which the document is conveyed at a constant speed and the image of the document is read through the stopped scanning optical system.

  By the way, in the image reading apparatus configured as described above, when reading an image of a document in the document movement reading mode, the image of the document is passed through the scanning optical system while the scanning optical system is stopped at a predetermined reading position. Therefore, the light source stopped at a predetermined position always illuminates the reading position of the document, and the temperature of the light source itself rises. There is a problem that the temperature becomes uniform and the temperature in the vicinity of the reading position of the document rises.

  Therefore, as a technique that can solve such a problem, for example, a technique disclosed in Japanese Patent Application Laid-Open No. 2004-228706 has been proposed.

The image reading apparatus according to Japanese Patent Application Laid-Open No. 2004-228706 illuminates image information on a document surface with a light beam from a reading optical system including an illumination light source, and the image information is formed on the reading means surface using an imaging means. In an image reading apparatus that forms an image and reads the image,
A pressure platen original reading mode for scanning the reading optical system in the sub-scanning direction with the image information stationary, and scanning the image information in the sub-scanning direction with the reading optical system stationary. A document scanning mode for scanning,
In the document scanning mode, the reflection member that reflects the light beam emitted from the illumination light source to the side opposite to the document surface is reflected to the document surface side, and the heat generated by the illumination light source is radiated to the outside. A heat radiating means, and the heat radiating means is provided integrally with the light reflecting member.

  However, the conventional technique has the following problems. That is, in the case of the image reading apparatus according to Japanese Patent Application Laid-Open No. 2004-228706, an increased reflection member dedicated to the original flow reading mode, which is used only in the original flow reading mode, and the increased reflection member are provided integrally. Therefore, there is a problem that the number of parts constituting the image reading apparatus increases, which is an obstacle to cost reduction and space saving.

  Accordingly, the present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to reduce the cost and space, and to provide a light source in the document moving reading mode. To provide an image reading apparatus capable of avoiding a decrease in the amount of light of a light source and a variation in the amount of light accompanying an increase in the temperature of the light source and an adverse effect associated with an increase in the temperature of a member disposed near the reading position. It is in.

That is, according to the first aspect of the present invention, the reading position is set at a constant speed while the scanning optical system for reading the original image is stopped at a predetermined reading position while illuminating the original image with a light source. In an image reading apparatus having a document movement reading mode for reading the image of the document while conveying the document so as to pass by
A heat conducting member that contacts the scanning unit including the light source stopped at the reading position in the document movement reading mode and transmits heat of the scanning unit including the light source to the reading device casing. An image reading apparatus characterized in that is provided.

  According to a second aspect of the present invention, the heat conducting member has a function of holding a scanning unit including the light source stopped at the reading position in the document movement reading mode at the reading position. The image reading apparatus according to claim 1, wherein the image reading apparatus is an image reading apparatus.

  Further, in the invention described in claim 3, the heat conducting member is provided at a reading position in the document moving reading mode, and guides a scanning unit including the light source so as to be movable along a sub-scanning direction. 3. The image reading apparatus according to claim 1, wherein a scanning unit including the light source protrudes in the vicinity of the guide rail so as to be close to the document side.

  According to the present invention, it is possible to reduce the cost and save the space, and in the document moving reading mode, the light source is reduced in light amount and the light amount varies as the temperature of the light source rises, and disposed near the reading position. Thus, it is possible to provide an image reading apparatus capable of avoiding the adverse effects caused by the temperature rise of the formed member.

  Embodiments of the present invention will be described below with reference to the drawings.

Embodiment 1
FIG. 2 is a cross-sectional configuration diagram showing the entire image reading apparatus according to Embodiment 1 of the present invention.

  In FIG. 2, reference numeral 1 denotes a housing of the image reading device. The image reading device housing 1 is a substantially rectangular parallelepiped box body having an inner surface constituted by a metal frame 2 and a large upper end surface. It is formed in a shape. A first platen glass 4 having a large area on which the document 3 is placed is disposed on the upper end surface of the image reading apparatus casing 1, and a first platen glass 4 is disposed above the image reading apparatus casing 1. An automatic document feeder (ADF) 5 serving as a platen cover for pressing the document 3 is disposed on the platen glass 4 so as to be freely opened and closed. In addition, the upper end surface of the image reading apparatus housing 1 has a width for reading an image of the original 3 while conveying the original 3 at a constant speed to the left end of the first platen glass 4. A narrow second platen glass 6 is provided. Further, an abutting member for abutting and positioning one end of the document 3 placed on the first platen glass 4 between the second platen glass 6 and the first platen glass 4. 7 is attached.

  As shown in FIG. 2, the automatic document feeder 5 includes a document transport unit 9 that automatically transports the document 3 at the left end of the platen cover unit 8. The document transport unit 9 feeds the document 3 placed on the document loading tray 10 in a state where the document 3 is fed by the paper feed roll 11 and separated one by one by the nudger roll 12 and the feed roll 13. When the paper 3 passes through the second platen glass 6 while being transported at a constant speed by a plurality of pairs of transport rollers 15, 16, 17 disposed along the document transport path 14. As will be described later, it is read by a scanning optical system. The document 3 transported by the transport rollers 15, 16, and 17 is discharged onto a discharge tray 19 provided on the upper surface of the platen cover unit 8 by a discharge roller 18.

  Further, when reading images on both the front and back sides of the document 3, the document 3 on which the image on one side is read is not directly discharged onto the discharge tray 19 by the discharge roll 18, and the rear end of the document 3 is placed on the discharge roll 18. , The discharge roll 18 is reversed and introduced into the front / back reversing path 20, and the conveying rolls 15, 16, 17 are turned in a state where the front / back of the document 3 is reversed via the front / back reversing path 20. The image on the back surface of the document 3 is read by a scanning optical system as will be described later when passing over the second platen glass 6 while being conveyed at a constant speed.

  Further, as shown in FIG. 2, the document 3 placed on the platen glass 4 while being pressed by the platen cover 8 of the automatic document feeder 5 is placed inside the image reading device housing 1. A first scanning unit 23 on which an illumination light source 21 including a xenon lamp that illuminates and a full rate mirror 22 that reflects a reflected light image from the document 3 in the horizontal direction is mounted is disposed. A second scanning unit 26 to which two half-rate mirrors 24 and 25 that reflect the reflected light image of the original 3 reflected by the above-described reflection are attached. As shown in FIG. 1, the first and second scanning units 23 and 26 are slidably attached to the image reading apparatus along the horizontal direction by guide rails 27 arranged along the sub-scanning direction. It has been. In addition, the first and second scanning units 23 and 26 are configured so that the first scanning unit 23 extends in the scanning direction by a driving pulley that is rotationally driven by a driving motor (not shown) and a tension wire that is moved by the driving pulley. The second scanning unit 26 is movable at a predetermined moving speed (1/2) V along the scanning direction. As a result, the first and second scanning units 23 and 26 are configured to scan and expose the image of the document 3 placed on the first platen glass 4 without changing the optical path length. .

  Further, as shown in FIG. 2, the image reading apparatus illuminates the image of the document 3 with a light source, and stops the scanning optical system that reads the image of the document 3 at a predetermined reading position. A document movement reading mode for reading an image of the document 3 while conveying the document 3 so as to pass through the position at a constant speed is provided. In the document movement reading mode, the first and second scanning units 23 and 26 stop at the reading position where the first scanning unit 23 is located directly below the second platen glass 6 as shown in FIG. The image of the document 3 moving at a constant speed on the second platen glass 6 is read.

  Further, as shown in FIG. 2, an imaging lens 27 that forms an image of the document 3 that is scanned and exposed by the first and second scanning units 23 and 26 is fixed inside the image reading apparatus housing 1. In addition, the CCD sensor 28 serving as a reading unit that reads an image of the original 3 imaged by the imaging lens 27 is fixed. The image of the original 3 is scanned and exposed on the CCD sensor 28 via the scanning optical system 29, and is read by the CCD sensor 28 at a predetermined dot density (for example, 1200 dpi or 2400 dpi). .

  The CCD sensor 28 is attached to a CCD printed circuit board 30 and is configured to be driven by a drive circuit (not shown) provided on the CCD printed circuit board 30. The image of the document 3 read by the CCD sensor 28 is sent to the image processing / control circuit 31 as image data of three colors, for example, red (R), green (G), and blue (B) (8 bits each). The image processing / control circuit 31 performs predetermined image processing such as shading correction, position shift correction, brightness / color space conversion, gamma correction, frame deletion, color / moving editing, etc. on the image data of the document 3. Image data is output. Further, the image processing / control circuit 31 can read an image of the document 3 at a predetermined magnification by controlling a driving motor (not shown) that drives the first and second scanning units 23 and 26. Yes.

  The image data subjected to the image processing by the image processing / control circuit 31 as described above is an image of four colors of yellow (Y), magenta (M), cyan (C), and black (K) (each 8 bits). The data is converted into data and output to an image output device such as a copying machine or a printer (not shown). Of course, the image data subjected to the image processing by the image processing / control circuit 31 as described above may be output to a personal computer or the like (not shown) and desired processing may be performed by the personal computer.

  By the way, in this embodiment, while the original image is illuminated by the light source, the scanning optical system for reading the original image is stopped at a predetermined reading position so as to pass through the reading position at a constant speed. In the image reading apparatus having a document moving reading mode for reading the image of the document while conveying the document, the reading device housing includes the light source stopped at the reading position in the document moving reading mode. A heat conducting member that contacts the scanning unit and transmits heat of the scanning unit including the light source to the reading device housing is provided.

  That is, in the image reading apparatus according to this embodiment, as indicated by a solid line in FIG. 2, in the document movement reading mode, the first scanning unit 23 moves to the reading position below the second platen glass 6, and It is stopped at the reading position. As shown in FIG. 1, the image reading apparatus housing 1 has heat conduction that abuts on both side surfaces of the first scanning unit 23 when the first scanning unit 23 moves to the reading position and stops. Metal plate springs 32, 32 as members are attached.

  The leaf springs 32 and 32 are preferably formed of a metal such as copper or nickel having a high thermal conductivity even among metals. In addition, in order to increase the contact area with the first scanning unit 23, it is desirable to use the leaf springs 32, 32 having a wide width in the direction perpendicular to the drawing in FIG.

  The base ends of the leaf springs 32 are attached to the metal frame 2 of the image reading apparatus housing 1 by means such as screws. Further, the plate springs 32 and 32 perform the first scanning so that heat from the illumination light source 21 mounted on the first scanning unit 23 is efficiently transmitted to the metal frame 2 side of the image reading device housing 1. Of the both side surfaces of the unit 23, the unit 23 is disposed so as to contact the vicinity of the illumination light source 21.

  With the above configuration, the image reading apparatus according to the first embodiment can reduce costs and save space as follows, and the temperature of the light source rises in the document moving reading mode. Accordingly, it is possible to avoid the adverse effects associated with a decrease in the amount of light of the light source, a variation in the amount of light, and an increase in the temperature of the member disposed in the vicinity of the reading position.

  That is, in the image reading apparatus according to the first embodiment, as shown in FIG. 2, the first and second scanning units 23 and 26 move to the left end portion of the image reading apparatus housing 1 in the document movement reading mode. Then, the first scanning unit 23 moves to a reading position located below the second platen glass 6 and stops.

  In this state, the image reading apparatus conveys the document 3 at a constant speed by the automatic document conveyance unit 9 of the automatic document conveyance device 5 as shown in FIG. It passes through the platen glass 6. At that time, the first scanning unit 23 turns on the illumination light source 21 to illuminate the image of the document 3 that moves on the second platen glass 6 at a constant speed, and reflects the reflected light image from the document 3. Is reflected by the full-rate mirror 22 of the first scanning unit 23 and the two half-rate mirrors 24 and 25 of the second scanning unit 26, and is scanned and exposed on the CCD sensor 28 via the imaging lens 27. The image of the document 3 is read by the CCD sensor 28.

  At this time, since the illumination light source 21 mounted on the first scanning unit 23 is always lit in the document movement reading mode, the temperature of the illumination light source 21 rises, and the temperature of the illumination light source 21 is increased by the heat of the illumination light source 21. One scanning unit 23 itself is heated, and the temperature of the first scanning unit 23 also rises.

  By the way, in the first embodiment, the leaf springs 32, 32 are in contact with both side surfaces of the first scanning unit 23 at the reading position of the first scanning unit 23 in the document movement reading mode. It is provided on a metal frame 2 of the body 1. For this reason, the heat of the first scanning unit 23 heated by the illumination light source 21 is transmitted to the metal frame 2 of the image reading apparatus housing 1 via the two leaf springs 32, 32 and escapes. It is possible to prevent the temperatures of the scanning unit 23 and the illumination light source 21 from unintentionally rising.

  For this reason, in the first embodiment, the temperatures of the first scanning unit 23 and the illumination light source 21 do not increase unintentionally. It is possible to avoid adverse effects associated with a decrease in the amount of light, variation in the amount of light, and an increase in the temperature of a member such as the second platen glass 6 disposed in the vicinity of the reading position.

  Further, in the first embodiment, since it is only necessary to provide the leaf springs 32, 32 on the metal frame 2 of the image reading apparatus housing 1, the increasing reflection member over the entire length of the illumination light source 21, or the integral with the increasing reflection member. In addition, it is not necessary to provide heat radiating means for radiating the heat generated by the illumination light source to the outside, and cost reduction and space saving are possible.

  In the first embodiment, the case where the metal leaf springs 32, 32 are used as the heat conducting member has been described. However, the present invention is not limited to this, and the heat conducting member is as shown in FIG. Alternatively, three-dimensional heat conductive members 33 and 33 made of metal or synthetic resin whose heat conductivity is increased by filling with a filler may be used. In this case, the contact area with the first scanning unit 23 can be set large, and the heat conduction efficiency can be further improved.

Embodiment 2
4 and 5 show a second embodiment of the present invention. The same reference numerals are given to the same parts as those in the first embodiment. In the second embodiment, the heat conduction is described. The member is configured to have a function of holding the scanning unit including the light source stopped at the reading position in the document movement reading mode at the reading position.

  That is, in the second embodiment, as shown in FIG. 4, the heat conducting member is formed not by a metal leaf spring but by metal eccentric rollers 40 and 40. The eccentric rollers 40 and 40 are rotatably attached to a support member 41 provided on the metal frame 2 of the image reading apparatus housing 1. The eccentric rollers 40 and 40 are not formed in a columnar shape with a constant outer diameter, but are formed so that the outer diameter gradually increases along the counterclockwise direction via the stepped portion 42.

  In the second embodiment, as shown in FIGS. 5A and 5B, when the first scanning unit 23 is moved to the reading position, the side surface 23a of the first scanning unit 23 is formed by the eccentric rollers 40, 40. When the eccentric rollers 40 and 40 rotate in contact with the eccentric outer peripheral surface 40a and the first scanning unit 23 moves, as shown in FIG. 5C, the first scanning unit 23 stops at the reading position. The outer peripheral surfaces 40a having large outer diameters of the eccentric rollers 40, 40 are in contact with both side surfaces 23a of the first scanning unit 23 so as to hold the first scanning unit 23 therebetween.

  Therefore, in the conventional image reading apparatus, in order to stop the first scanning unit 23 at the reading position in the document movement reading mode, the drive motor (not shown) that drives the first scanning unit 23 is energized and excited. Although it was necessary to maintain the first scanning unit 23 in a state where it is stopped at the reading position by the eccentric rollers 40, 40, the energization to the drive motor can be cut off, and the power consumption can be reduced accordingly. It is possible to reduce.

  The heat conducting member is not limited to the metal eccentric rollers 40, 40, but is attached to the metal frame 2 of the image reading apparatus housing 1 so as to be swingable as shown in FIGS. A metal link 45 may be used. One end of the link 45 is provided with a contact portion 45a that contacts the front end surface 23b of the first scanning unit 23. When the first scanning unit 23 moves to the reading position, the first scanning unit 23 is provided. The front end surface 23b of the first scanning unit 23 comes into contact with the contact portion 45a, the link 45 swings counterclockwise, and the gripping arm portion 45b provided integrally with the link 45 is connected to the first scanning unit 23. It is configured to hold at the reading position so as to grip both side surfaces 23a.

  In this case, the first scanning unit 23 can be reliably held by the metal link 45, and the contact area with the first scanning unit 23 can be increased.

  Further, when the first scanning unit 23 moves from the reading position, the arm portion 45b is pushed by the first scanning unit 23, and the link 45 swings in the clockwise direction to release the gripping state. It is like that. The link 45 may be configured such that the first scanning unit 23 can be held and released more reliably by being biased clockwise by a coil spring or the like (not shown).

  Since other configurations and operations are the same as those of the first embodiment, description thereof is omitted.

Embodiment 3
8 to 10 show a third embodiment of the present invention. The same reference numerals are given to the same parts as those in the first embodiment, and in the third embodiment, the third embodiment will be described. 2, the heat conducting member is configured to have a function of holding the scanning unit including the light source stopped at the reading position in the document movement reading mode at the reading position.

  In the third embodiment, the heat conducting member is provided at a reading position in the document moving reading mode, and a guide rail that guides the scanning unit including the light source so as to be movable along the sub-scanning direction. In the vicinity, the scanning unit including the light source projects so as to approach the document side.

  That is, in the third embodiment, as shown in FIG. 8, in the vicinity of the guide rail 27 that guides the first scanning unit 23 movably along the sub-scanning direction, the first scanning unit 23 is placed on the document 3 side. Protrusions 50 and 51 as heat conductive members are provided so as to protrude so as to be close to each other. The metal protrusions 50 and 51 as the heat conducting members are disposed on both sides along the longitudinal direction of the first scanning unit 23.

  As for the said convex parts 50 and 51, as shown in FIG. 9, the convex part 50 located in the front end side along the moving direction of the 1st scanning unit 23 is set higher than the other convex part 51. As shown in FIG. Further, on the lower surface of the first scanning unit 23, metal leg portions 52 and 53 that are in contact with the convex portions 50 and 51 on the image reading apparatus housing 1 side are projected downward, and the first scanning unit 23. The leg part 52 located on the tip side along the moving direction is set shorter than the other leg part 53.

  In the third embodiment, as shown in FIGS. 9A and 9B, when the first scanning unit 23 moves to the reading position and stops, the lower surface of the first scanning unit 23 faces downward. The protruding metal legs 52 and 53 ride on the convex portions 50 and 51 provided on the image reading apparatus housing 1, and the first scanning unit 23 moves to the document 3 side (upward). The document 3 can be efficiently illuminated by the illumination light source 21 mounted on the first scanning unit 23, and the leg portions 52 and 53 of the first scanning unit 23 are provided in the image reading device casing 1. The heat of the first scanning unit 23 can be transmitted to the image reading apparatus housing 1 side by abutting against the convex portions 50 and 51 formed.

  Therefore, even in the third embodiment, since the temperatures of the first scanning unit 23 and the illumination light source 21 do not increase unintentionally, the light source of the light source accompanying the increase in the temperature of the illumination light source 21 in the document moving reading mode is not affected. It is possible to avoid adverse effects associated with a decrease in the amount of light, variation in the amount of light, and an increase in the temperature of a member such as the second platen glass 6 disposed in the vicinity of the reading position.

  In the third embodiment, the projections 50 and 51 need only be provided on the metal frame 2 of the image reading apparatus housing 1 and the legs 52 and 53 need only be provided on the first scanning unit 23. Therefore, it is not necessary to provide an increasing reflection member over the entire length of 21 or a heat dissipating means for dissipating the heat generated by the illumination light source to the outside integrally with the increasing reflection member, so that cost reduction and space saving are possible.

  As the convex portion 60 on the image reading apparatus housing 1 side, as shown in FIG. 10, the upper end surface of which is formed in a slope shape is used, and the leg portion 61 on the first scanning unit 23 side is used. Alternatively, a device having a slope facing the convex portion 60 on the image reading device housing 1 side may be used. In this case, the movement of the first scanning unit 23 toward the original 3 (upward) can be performed more smoothly.

  By the way, in the conventional image reading apparatus, since the focal position of the scanning optical system is aligned with the surface of the first platen glass 4, the document 3 placed in close contact with the surface of the first platen glass 4. However, the original 3 moving on the second platen glass 6 floats from the surface of the second platen glass 6 to prevent the image of the original 3 from being stained. Since the vehicle travels in a state, the image is out of focus and is out of focus, and the image quality of the image of the document 3 is deteriorated.

  On the other hand, in the third embodiment, when the first scanning unit 23 moves to the reading position and stops, the first scanning unit 23 moves to the document 3 side (upward). Since the focal position (focus position) of the scanning optical system constituted by the first scanning unit 23 and the second scanning unit 26 also moves upward, the document that travels while floating from the surface of the second platen glass 6. 3 can be focused, and there is a specific effect that the read image quality of the image of the document 3 can be prevented from deteriorating.

  Since other configurations and operations are the same as those of the first embodiment, description thereof is omitted.

FIG. 1 is a plan view showing the main part of an image reading apparatus according to Embodiment 1 of the present invention. FIG. 2 is a sectional configuration diagram showing the image reading apparatus according to Embodiment 1 of the present invention. FIG. 3 is a plan view showing the principal part of a modification of the image reading apparatus according to Embodiment 1 of the present invention. FIG. 4 is a plan view showing the main part of an image reading apparatus according to Embodiment 2 of the present invention. FIG. 5 is a main part explanatory view showing the operation of the image reading apparatus according to Embodiment 2 of the present invention. FIG. 6 is a main part configuration diagram showing a modification of the image reading apparatus according to Embodiment 2 of the present invention. FIG. 7 is a main part configuration diagram showing a modification of the image reading apparatus according to Embodiment 2 of the present invention. FIG. 8 is a side configuration diagram showing a main part of an image reading apparatus according to Embodiment 3 of the present invention. FIG. 9 is an explanatory view showing the operation of the image reading apparatus according to Embodiment 3 of the present invention. FIG. 10 is a block diagram showing a modification of the image reading apparatus according to Embodiment 3 of the present invention.

Explanation of symbols

  1: Image reading device casing, 21: illumination light source, 22: reflecting member, 23: first operation unit, 32: heat conducting member.

Claims (3)

While illuminating the original image with a light source, the scanning optical system for reading the original image is stopped at a predetermined reading position, while conveying the original so as to pass through the reading position at a constant speed, In an image reading apparatus having a document movement reading mode for reading an image of the document,
A heat conducting member that contacts the scanning unit including the light source stopped at the reading position in the document movement reading mode and transmits heat of the scanning unit including the light source to the reading device casing. An image reading apparatus comprising: The image reading apparatus according to claim 1, wherein the heat conducting member has a function of holding a scanning unit including the light source stopped at a reading position in the document movement reading mode at the reading position. . The heat conducting member is provided at a reading position in the document moving reading mode and includes a scanning unit including the light source in the vicinity of a guide rail that guides the scanning unit including the light source so as to be movable along the sub-scanning direction. The image reading apparatus according to claim 1, wherein the image reading apparatus protrudes so as to be close to the document side.

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