JP2018033010A - Image reading device and image forming apparatus - Google Patents

Abstract

An object of the present invention is to reduce backlash between a substrate and a light guide unit and improve positioning accuracy between a light source and a light guide unit. An LED substrate 60 (substrate) in which a plurality of LEDs 62 (light sources) are arranged in a longitudinal direction and a slot portion 76 (holding portion) for holding the LED substrate 60 is provided, and light emitted from the plurality of LEDs 62 is received. A light guide 70 (light guide portion) for guiding, a base portion 80 (support portion) for supporting the light guide 70, and a substrate bias for biasing the LED substrate 60 toward the slot portion 76 in the longitudinal direction. And a CCD (image reading unit) that photoelectrically converts reflected light of the sheet that has received the light emitted from the light guide 70 and reads image information. [Selection] Figure 9

Description

  The present invention relates to an image reading apparatus that reads an image on a sheet and an image forming apparatus including the image reading apparatus.

  In general, an image forming apparatus such as a copying machine or a facsimile includes an image reading device that optically reads an image of a document. This image reading apparatus is known to include an illuminating device in which a plurality of LEDs (point light sources) are linearly arranged to illuminate a document. When a plurality of LEDs are used as a light source, in order to suppress the occurrence of illuminance distribution unevenness in the LED array direction on the document surface, the lighting device includes a light guide member made of transparent resin, glass, or the like between the document surface and the LED. I have. The light guide member guides light emitted from the plurality of LEDs and diffusing in a circular shape toward the original surface along the main scanning direction (LED arrangement direction) at the time of reading the original.

  Here, when the positional relationship between the plurality of LEDs and the light guide member is shifted, there is a problem that it is difficult to illuminate the document surface evenly along the main scanning direction. That is, since the incident surface of the light guide member and the LED arrangement direction are not parallel, the distance between the incident surface of the light guide member and the LED may be different at both ends in the main scanning direction. In this case, since the light emitted from the LED diffuses in a conical shape, the amount of light incident on the light guide member is large at the portion where the distance between the incident surface and the LED is small, and the amount of light is small at the portion where the distance is large. There is a risk of unevenness in the light irradiation intensity.

  In addition, even if the incident surface of the light guide member and the LED arrangement direction are parallel, if the distance between the LED and the incident surface of the light guide member is too wide, the amount of light emitted from the LED and incident on the light guide member May decrease, and the illuminance on the document surface may be insufficient. Therefore, when a light source having a relatively low light irradiation intensity such as an LED is used, the light irradiated from the light source is incident on the light guide member as much as possible, and the unevenness of the light irradiation intensity in the main scanning direction can be suppressed. desired. In order to meet this demand, high accuracy is required for the relative positioning of the light source unit and the light guide member.

  2. Description of the Related Art Conventionally, an image reading apparatus has been proposed in which a light source unit is fixed to a light guide member with a fixing screw, and the light guide member and the light source unit are positioned (see Patent Document 1). Further, there has been proposed an image reading apparatus in which a circuit board having a light emitting element is attached to a base plate with screws or the like, and a light guide member is positioned with respect to the base plate by an elastic plate locked to the base plate (patent). Reference 2).

JP 2010-178354 A JP 2012-129974 A

  However, since the image reading apparatus described in Patent Document 1 positions the light guide member and the light source unit with a fixing screw, if the fixing screw is loosened due to vibration or the like, the light guide member and the fixing screw are positioned. Accuracy will be reduced. Further, since the image reading apparatus described in Patent Document 2 positions the light emitting element and the base plate, and the base plate and the light guide member, the base plate is interposed between the light emitting element and the light guide member. . For this reason, there is a problem in the positioning accuracy between the light emitting element and the light guide member because it is easily influenced by the dimensional tolerance of the base plate and the mounting position accuracy of the member.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an image reading apparatus that reduces backlash between a substrate and a light guide section and improves the positioning accuracy between the light source and the light guide section, and an image forming apparatus including the image reading apparatus. To do.

  In the image reading apparatus, the present invention includes a substrate on which a plurality of light sources are arranged in a longitudinal direction, a holding unit that holds the substrate, and a light guide unit that guides light emitted from the plurality of light sources, A support unit that supports the light guide unit, a biasing unit that biases the substrate toward the holding unit in a direction intersecting the longitudinal direction, and a sheet that receives light emitted from the light guide unit. And an image reading unit that photoelectrically converts the reflected light and reads image information.

  According to the present invention, the substrate is urged toward the holding unit that holds the substrate on which the plurality of light sources are arranged, so that the backlash between the substrate and the light guide unit is reduced and the light source and the light guide unit are positioned. Accuracy can be improved.

1 is an overall schematic diagram illustrating a printer according to a first embodiment. Sectional drawing which shows a reading unit. Sectional drawing which shows a scanner unit. The perspective view which shows an illumination unit. (A) is the disassembled perspective view which looked at the light guide unit from the top, (b) is the disassembled perspective view which looked at the light guide unit from the bottom. The perspective view and enlarged perspective view which show a base part. (A) is the perspective view which looked at the light guide unit from the upper part, (b) is the perspective view which looked at the light guide unit from the lower part. (A) is a bottom view showing how the LED board is assembled to the light guide, and (b) is a front view and an enlarged front view showing that the LED board is held in the slot portion. The schematic diagram which shows a board | substrate biasing part. The perspective view which shows the light guide which concerns on 2nd Embodiment. The schematic diagram which shows a board | substrate biasing part.

<First Embodiment>
Hereinafter, an image reading apparatus and an image forming apparatus according to the present invention will be described with reference to the drawings. The dimensions, materials, shapes, relative arrangements, and the like of the components described in the following embodiments are not intended to limit the scope of application of the present technology only to those unless otherwise specified. .

[Schematic configuration of printer]
First, a schematic configuration of a printer 101 as an image forming apparatus will be described with reference to FIG. As shown in FIG. 1, the printer 101 includes a printer main body 101 </ b> A and an image reading device 103. The image reading device 103 disposed above the printer main body 101A includes a reading unit 30 and an ADF 1 as will be described in detail later, and reads the image information by optically scanning the document D. The document D is a sheet such as a sheet of paper or an envelope, a plastic film such as an overhead projector sheet (OHT), or a cloth. The image information converted into an electrical signal by the image reading device 103 is transferred to the control unit 122 provided in the printer main body 101A. In the present embodiment, the front side of the apparatus when standing on an operation panel (not shown) for operating the printer 101 is defined as the front side, and the rear side of the apparatus is defined as the back side.

  The printer main body 101A includes an image forming unit 119 that forms an image on a sheet P that is a recording medium, a sheet feeding unit 34 that feeds the sheet P to the image forming unit 119, and a manual feeding unit 117. ing. The sheet feeding unit 34 includes sheet storage units 137a, 137b, 137c, and 137d that can store sheets of different sizes. The sheets stored in each sheet storage unit are fed out by the pickup roller 32, separated one by one by the feed roller 33a and the retard roller 33b, and delivered to the corresponding conveying roller pair 120. Then, the sheet P is sequentially transferred to a plurality of conveyance roller pairs 120 arranged along the sheet conveyance path, and is conveyed to the registration roller pair 136.

  Note that the sheet P placed on the manual feed tray 137e of the manual feed unit 117 by the user is fed into the printer main body 101A by the feed roller 138 and conveyed to the registration roller pair 136. The registration roller pair 136 corrects the skew feeding by stopping the leading edge of the sheet P, and resumes the conveyance of the sheet P in accordance with the progress of the image forming operation which is a toner image forming process by the image forming unit 119.

  The image forming unit 119 that forms an image on the sheet P is an electrophotographic unit including a photosensitive drum 121 that is a photosensitive member. The photosensitive drum 121 can be rotated along the conveyance direction of the sheet P. Around the photosensitive drum 121, a charger 118, an exposure device 123, a developing device 124, a transfer charger 125, a separation charger 126, and a cleaner 127. Is arranged. The charger 118 uniformly charges the surface of the photosensitive drum 121, and the exposure device 123 exposes the photosensitive drum 121 based on image information input from the image reading device 103 and the like, and an electrostatic latent image is formed on the photosensitive drum 121. Form.

  The developing device 124 contains a two-component developer containing toner and carrier, and develops the electrostatic latent image into a toner image by supplying charged toner to the photosensitive drum 121. The toner image carried on the photosensitive drum 121 is transferred to the sheet P conveyed from the registration roller pair 136 by a bias electric field formed by the transfer charger 125. The sheet P to which the toner image has been transferred is separated from the photosensitive drum 121 by the bias electric field formed by the separation charger, and is conveyed toward the fixing unit 129 by the pre-fixing conveyance unit 128. Note that deposits such as transfer residual toner remaining on the photosensitive drum 121 without being transferred to the sheet P are removed by the cleaner 127, and the photosensitive drum 121 prepares for the next image forming operation.

  The sheet P conveyed to the fixing unit 129 is heated while being sandwiched and pressed by a pair of rollers, and the image is fixed by melting and fixing the toner. When the image output is completed, the sheet P on which the fixed image is obtained is discharged to the discharge tray 130 protruding outward from the printer main body 101A via the discharge roller pair 40. When an image is formed on the back side of the sheet P in duplex printing, the sheet P that has passed through the fixing unit 129 is switched between the front side and the back side by the reversing unit 139, and is conveyed to the registration roller pair 136 by the duplex conveyance unit 140. The Then, the sheet P on which the image is formed again by the image forming unit 119 is discharged to the discharge tray 130.

[Image reading device]
Next, the configuration of the image reading apparatus 103 will be described with reference to FIGS. 1, 2, and 3. As shown in FIG. 1, the ADF 1 conveys the document D placed on the document feeding tray 2 toward the document discharge tray 3. As shown in FIG. 2, the reading unit 30 has an exterior formed by a frame 30a, and a platen glass 31 and a platen glass 31a are disposed on the upper surface of the frame 30a. A scanner unit 50 is held inside the frame 30a, and the scanner unit 50 is configured to be movable in parallel to the document table glass 31 by a wire or a belt (not shown) driven by a motor. .

  As shown in FIG. 3, the scanner unit 50 is a CCD (Charge Coupled Devices) type sensor unit. Specifically, the scanner unit 50 includes a box frame 51, an illumination unit 55 attached to the top of the box frame 51, mirrors 52a, 52b, 52c, 52d, and 52e, a lens unit 53, and a CCD 54. doing.

  The illumination unit 55 includes two light guide units 56L and 56R. Lights L1 and L2 emitted from the light guide units 56L and 56R toward the document D are reflected by the document D. The reflected light L3 reflected by the document D forms an image on the CCD 54 via the mirrors 52a, 52b, 52c, 52d, 52e and the lens unit 53. The CCD 54 (image reading unit) photoelectrically converts an image formed by the reflected light L3 and outputs an electrical signal corresponding to the image on the image reading surface (lower surface) of the document D to the control unit 122.

  The image reading apparatus 103 configured as described above is based on a flow reading mode in which a document image is scanned while feeding the document D by the ADF 1 and a fixed reading mode in which the document placed on the document table glass 31 is scanned. Then, image information is read from the document D. The flow-reading mode is selected when the apparatus detects the document D placed on the document feeding tray 2 or when the user explicitly instructs it through the operation panel of the printer main body 101A. In this case, the ADF 1 feeds the documents D placed on the document feeding tray 2 one by one with the scanner unit 50 below the platen glass 31a. The scanner unit 50 scans the image reading surface of the document D by irradiating the scanning light through the platen glass 31a. That is, the scanner unit 50 performs image reading of the document D placed on the document table glass 31 by scanning in the sub-scanning direction (left-right direction in FIG. 1).

  On the other hand, the fixed reading mode is selected when the apparatus detects the document D placed on the document table glass 31 or when the user explicitly instructs it through the operation panel or the like of the printer main body 101A. In the fixed reading mode, the user first opens the ADF 1 to place the document on the document table glass 31, and closes the ADF 1 to position the document on the document table glass 31. Then, the scanner unit 50 scans the document D placed on the document table glass 31 by irradiating light while moving along the document table glass 31. A scanner unit for executing the flow reading mode and a scanner unit for executing the fixed reading mode may be provided separately.

[Configuration of light guide unit]
As shown in FIG. 4, the illumination unit 55 includes a base portion 80 (supporting portion) to which the light guide units 56L and 56R are attached. The light guide units 56L and 56R have the same configuration and are arranged symmetrically in the sub-scanning direction. Since the light guide units 56L and 56R are attached to the base portion 80 in the same manner, only the light guide unit 56R will be described below, and the description of the light guide unit 56L will be omitted.

  As shown in FIGS. 5A and 5B, the light guide unit 56R includes a light guide 70 (light guide unit) and an LED substrate 60 (substrate). The LED board 60 includes a board part 61, a plurality of LEDs 62 (light sources) mounted on the board part 61, and a connector part 63 electrically connected to the plurality of LEDs 62. Here, the plurality of LEDs 62 are mounted linearly in the longitudinal direction of the substrate portion 61, and the mounting direction is the same as the main scanning direction orthogonal to the sub-scanning direction described above. Further, the plurality of LEDs 62 are supplied with electric power via a connector part 63 by electric wiring (not shown). A broken line region shown in FIG. 5A is an insertion portion 61 a included in the substrate portion 61. Hereinafter, the sub-scanning direction, which is the moving direction of the scanner unit 50, is defined as the y direction, the main scanning direction is defined as the x direction, and the vertical direction perpendicular to the x direction and the y direction is defined as the z direction.

  The light guide 70 is formed on both end portions in the x direction and is in contact with the contact portions 71 a and 71 b that contact the base portion 80, the slot portions 76, 77, and 78 (holding portions) that hold the LED substrate 60, and the base portion 80. And positioning pin portions 76b and 78b to be inserted. The positioning pin portions 76b and 78b extend downward from the lower surface 76a of the slot portion 76 and the lower surface 78a of the slot portion 78, respectively. The light guide 70 includes an incident surface 74 on which light emitted from the plurality of LEDs 62 is incident, and an output surface 75 from which the incident light is emitted toward the image reading surface of the document D. The light incident from the incident surface 74 is reflected a plurality of times in the light guide 70 and then guided to the emission surface 75.

  As shown in FIG. 6, the base portion 80 is inserted with a round hole portion 81R into which the positioning pin portion 78b is inserted, an elongated round hole portion 82R into which the positioning pin portion 76b is inserted, and a tool pin (not shown). Hole portions 83a, 83b, 83c. Note that another set of similar holes is formed in the base portion 80 in order to attach the light guide unit 56L. The base unit 80 includes an opening 84 for allowing the reflected light L3 from the document D to pass through the box frame 51.

[Attaching the LED board to the light guide unit]
As shown in FIGS. 7A and 7B, the LED substrate 60 is inserted into the slot portions 76, 77, and 78 of the light guide 70 by inserting the insertion portion 61a (see FIG. 5A). And held by the light guide 70.

  Here, as shown in FIG. 8A, the substrate portion 61 has notches 64a and 64c formed at both ends in the x direction, and a notch 64b (concave portion) is formed at the center in the x direction. Is formed. These notches 64a, 64b, and 64c are recessed with respect to the arrow A direction described later. When the insertion portion 61a of the LED substrate 60 is inserted into the slot portions 76, 77, and 78, the slot portion 77 is fitted (engaged) with the notch portion 64b in the x direction. The fitting restricts the displacement of the LED board 60 in the x direction (main scanning direction, longitudinal direction) with respect to the light guide 70. At this time, a sufficient interval is provided between the notch portion 64a and the slot portion 76 and between the notch portion 64c and the slot portion 78 so that they do not interfere with each other in the x direction. Due to the heat generated by the lighting of the LED 62 and the thermal expansion of the member accompanying the temperature change of the external environment, a displacement difference in the x direction due to the difference in thermal expansion coefficient may occur between the light guide 70 and the LED substrate 60. However, by providing the above-described interval, it is possible to prevent warpage and distortion caused by the tension between the light guide 70 and the LED substrate 60.

  Further, as shown in FIG. 8B, when the insertion portion 61a is inserted into the slot portions 76, 77, 78, the insertion portion 61a is clamped in a state of being press-fitted into the slot portions 76, 77, 78. . Specifically, each of the slot portions 76, 77, and 78 has a substantially U-shaped cross-sectional shape that is open on one side in the y direction, and ribs are respectively formed inside the slot portions 76, 77, and 78. 76c, 77c, 78c are formed. When the insertion portion 61a of the LED substrate 60 is inserted between the ribs 76c, 77c, and 78c and the facing surface 70a that faces them, the ribs 76c, 77c, and 78c are elastically deformed, and the insertion portion 61a is It is clamped in the press-fitted state. Thereby, the displacement of the z direction (up-down direction) with respect to the light guide 70 of the LED board 60 is controlled. Further, the LED substrate 60 is sandwiched between the slot portions 76, 77, and 78, so that the warpage inherent to the LED substrate 60 can be corrected.

[Attaching the light guide unit to the base]
When attaching the light guide unit 56R to the base portion 80, first, as shown in FIG. 6 and FIG. 9, the operator inserts the positioning pin portion 78b into the round hole portion 81R, and the positioning pin portion 76b to the long round shape. Insert into the hole 82R. Thereby, the displacement of the light guide unit 56R in the x direction (main scanning direction) and the y direction (sub scanning direction) with respect to the base portion 80 is restricted.

  Then, the operator inserts a tool pin (not shown) from below into the holes 83a, 83b, 83c of the base. Accordingly, the tool pins abut on the lower surfaces 76a, 77a, 78a of the slot portions 76, 77, 78 in a state where the abutting portions 71a, 71b are in contact with the upper surface 80a of the base portion 80. The operator adjusts the position of the tool pin so that the lower surfaces 76 a, 77 a, and 78 a have substantially the same height, and then fixes the tool pin to the base portion 80. As a result, the position of the light guide unit 56R in the z direction (vertical direction) is determined. Since the slot portions 76, 77, 78 and the tool pin are respectively provided at the center portion and both end portions in the x direction of the light guide 70, the light guide 70 originally corrects warpage from the time of component molding. Is possible.

  Here, as shown in FIG. 9, three claw-shaped substrate urging portions 90 (urging portions) are integrally formed in the base portion 80 at positions corresponding to the slot portions 76, 77, and 78, respectively. ing. As described above, when the light guide unit 56 </ b> R is attached to the base portion 80, the three substrate urging portions 90 are pushed away from the rear end surface 61 b of the substrate portion 61 and flexibly elastically. At this time, a part of the restoring force generated in the substrate urging unit 90 works as an urging force that urges the LED substrate 60 in the direction of arrow A, which is the urging direction intersecting the longitudinal direction of the LED substrate 60. By this urging force, the LED substrate 60 is displaced in the direction of arrow A toward the slot portions 76, 77, 78 until the plurality of LEDs 62 abut on the incident surface 74 of the light guide 70. That is, the displacement of the LED substrate 60 in the y direction (sub-scanning direction) with respect to the light guide 70 is regulated by the urging force of the substrate urging unit 90.

  As described above, the LED substrate 60 is positioned with respect to the light guide 70. At the same time, the light guide unit 56R is positioned with respect to the base portion 80, and the light guide unit 56R including the light guide 70 and the LED substrate 60 is fixed by UV bonding to the base portion 80. Similarly, the light guide unit 56L is also fixed to the base portion 80.

  As described above, the LED substrate 60 is urged to the slot portions 76, 77, and 78 of the light guide 70 by the substrate urging portion 90 that is provided integrally with the base portion 80. For this reason, the play between the LED board 60 and the light guide 70 is reduced, and the positioning accuracy of the plurality of LEDs 62 and the light guide 70 can be improved. In addition, the plurality of LEDs 62 are urged in a direction (arrow A direction) approaching the incident surface 74 by the substrate urging unit 90 in a state where the plurality of LEDs 62 are in contact with the incident surface 74 of the light guide 70. Also, the LED 62 and the incident surface 74 are not separated from each other. For this reason, most of the light emitted from the plurality of LEDs 62 is incident on the light guide 70, and a sufficient amount of light of the scanner unit 50 can be secured.

  In addition, the board urging unit 90 is provided integrally with the base unit 80, and the light guide 70 and the LED board 60 can be positioned and held with the minimum number of components, thereby reducing assembly man-hours and costs. can do. In addition, since the number of parts is small, it is possible to reduce illumination defects due to misalignment of the light guide 70 and the LED board 60 due to accumulation of part tolerances. Further, since the double-sided tape is not used for positioning and holding the light guide 70 and the LED substrate 60, it is possible to reduce processes such as release paper removal and pasting processing. The positional deviation of 60 can also be prevented. Also, the non-use of the double-sided tape is advantageous from the viewpoint of automation of the assembly process.

  The slot portions 76, 77, and 78, the notches 64a, 64b, and 64c, and the substrate urging portion 90 are provided three by three, but may be provided by one or two or four or more. In that case, it is desirable to provide at least one slot portion that fits in the main scanning direction with respect to the notch portion in the vicinity of the central portion in the main scanning direction.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. In the second embodiment, the substrate urging portion of the first embodiment is configured integrally with a light guide. For this reason, about the structure similar to 1st Embodiment, illustration is abbreviate | omitted or attaches | subjects the same code | symbol to a figure and demonstrates.

  As shown in FIGS. 10 and 11, the light guide 170 (light guide portion) has slot portions 176, 177 and 178 (holding portions). These slot portions 176, 177, and 178 are integrally formed with elastically deformable substrate urging portions 190a, 190b, and 190c (urging portions). That is, the substrate urging portions 190 a, 190 b, and 190 c are provided integrally with the light guide 170.

  In the first embodiment, as shown in FIG. 9, the LED substrate 60 is inserted from the opened one side of the slot portions 76, 77, 78 having a U-shaped cross section. In this embodiment, there is a possibility that the board urging unit 190 may interfere with the insertion of the LED board 60. Therefore, the LED substrate 60 may be inserted in a state where the substrate urging portion 190 is elastically deformed in the direction away from the slot portions 76, 77, 78, but the LED substrate 60 is slotted from the x direction (main scanning direction). You may insert in the part 76,77,78.

  The LED substrate 60 sandwiched between the slot portions 76, 77, and 78 is urged in the direction of arrow A by the urging force of the substrate urging portion 190. Due to this urging force, the LED substrate 60 is displaced in the direction of the arrow A toward the slot portions 176, 177, and 178 until the plurality of LEDs 62 abut on the incident surface 74 of the light guide 170. That is, the biasing force of the substrate biasing unit 190 regulates the displacement of the LED substrate 60 in the y direction (sub-scanning direction) with respect to the light guide 170. The light guide unit 156R in a state where the LED substrate 60 is attached to the light guide 170 is attached to the base portion (see FIG. 9) as in the first embodiment.

  According to this configuration, when the LED board 60 is assembled to the light guide 170, positioning / holding of the LED board 60 with respect to the light guide 170 is established. Therefore, there is no need to assemble the light guide unit 156R to the base portion 80 while elastically deforming the substrate urging portion 190, and the light guide unit 156R can be assembled to the base portion 80 as compared with the first embodiment. It becomes easier.

  In the first and second embodiments, the slot portion formed in the light guide has a substantially U-shaped cross section, but the present invention is not limited to this. Further, the shape of the substrate urging portion is not limited to FIG. 9 or FIG. In the first and second embodiments, two light guide units are provided, but one or three or more may be used. Further, the image reading apparatus 103 is not limited to the one having the ADF 1, and may have only a pressure plate that presses the document against the document table glass 31 from above.

  In any of the above-described embodiments, the electrophotographic printer 101 has been described, but the present invention is not limited to this. For example, the present invention can be applied to an inkjet image forming apparatus that forms an image on a sheet by ejecting ink liquid from a nozzle.

  54: Image reading unit (CCD) / 60: Substrate (LED substrate) / 62: Plural light sources (LED) / 64b: Recess (notch) / 70, 170: Light guide unit (light guide) / 74: Incident surface / 76, 77, 78, 176, 177, 178: holding part (slot part) / 80: support part (base part) / 90, 190: biasing part (substrate biasing part) / 101: image forming apparatus / 103 : Image reading device / 119: Image forming unit

Claims (8)

A substrate on which a plurality of light sources are arranged in the longitudinal direction;
A light guide unit that has a holding unit for holding the substrate and guides light emitted from the plurality of light sources;
A support part for supporting the light guide part;
An urging portion for urging the substrate toward the holding portion in a direction intersecting the longitudinal direction;
An image reading unit that photoelectrically converts reflected light of the sheet that has received light emitted from the light guide unit and reads image information;
An image reading apparatus. The urging portion is provided integrally with the support portion.
The image reading apparatus according to claim 1. The urging portion is provided integrally with the light guide portion,
The image reading apparatus according to claim 1. The light guide has an incident surface on which light emitted from the plurality of light sources is incident,
The biasing unit biases the substrate so that the plurality of light sources are in contact with the incident surface.
The image reading apparatus according to claim 1, wherein the image reading apparatus is an image reading apparatus. The substrate has a recess recessed with respect to the biasing direction of the biasing portion,
The holding portion regulates movement of the substrate in the longitudinal direction by engaging with the concave portion.
The image reading apparatus according to claim 1, wherein the image reading apparatus is an image reading apparatus. The holding portion holds the substrate in a press-fitted state in the thickness direction of the substrate.
The image reading apparatus according to claim 1, wherein the image reading apparatus is an image reading apparatus. The holding part has a cross-sectional shape opened with respect to the urging direction of the urging part,
The image reading apparatus according to claim 6. An image reading apparatus according to any one of claims 1 to 7,
An image forming unit that forms an image on a sheet,
An image forming apparatus.

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