JP6460872B2 - Image reading apparatus and image forming apparatus - Google Patents

Description

  The present invention relates to an image reading apparatus and an image forming apparatus including the same.

  In this type of image reading apparatus, an original is illuminated by a light source unit below the glass while being conveyed in the sub-scanning direction on the glass, and the original is mainly captured by an image sensor such as a CCD (Charge Coupled Device). Repeated scanning in the scanning direction for reading, or positioning and placing the document on the glass, illuminating the document with the light source while moving the light source and image sensor in the sub-scanning direction under the glass. Thus, the document is repeatedly scanned in the main scanning direction by the image sensor and read. There are various light source units for illuminating the document, and fluorescent lamps, LED arrays, and the like are used.

  In such an image reading apparatus, a light source or the like emits light for illuminating a document, and the document surface is irradiated with light through a light guide member or the like, and reflected light (reading light) reflected by the document surface is predetermined. The image is taken by reaching the image sensor such as a CCD along the optical path. At this time, the light is extracted from the exit surface by scattering and reflecting the light while guiding the light inside the light guide member.

  In this case, light of various wavelengths is emitted from the light emitting element, and light of wavelengths in the infrared region is included therein.

  For this reason, there has been proposed an image reading apparatus in which an infrared cut filter for cutting light having a wavelength in the infrared region is provided between a light emitting element and a light guide member (see, for example, Patent Document 1).

  In Patent Document 1, a wide-directional LED and a light guide member are used as a light source. The light guide member has one end surface (incident surface) in contact with the light emitting portion of the LED and the other end surface (exit surface) side in the illumination direction. There is disclosed a configuration in which an infrared cut filter that is arranged in a facing state and that cuts light having a wavelength in the infrared region is provided on the exit surface of the light guide member.

JP 2006-227384 A

  By the way, as the LED becomes brighter, a larger heat dissipation mechanism is required, and heat resistance of peripheral members including the light guide member is required. However, in Patent Document 1, since the infrared cut filter is provided on the other end surface (outgoing surface) of the light guide member away from the LED, light having an infrared wavelength is guided to the light guide member in the vicinity of the LED. Therefore, there is a problem that heat from the LED is transmitted to the peripheral member including the light guide member.

  The present invention has been devised to solve such problems, and its purpose is to use the fact that the image reading apparatus moves in the sub-scanning direction when reading an image of the document placed on the document table. It is an object of the present invention to provide an image reading apparatus and an image forming apparatus that are excellent in cooling effect by guiding the air flow caused by the above to the periphery of the light emitting element.

In order to solve the above problems, an image reading apparatus of the present invention includes a light emitting element and an elongated light guide member, and guides light from the light emitting element from the end face of the light guide member to the inside. An image reading apparatus including an illuminating unit that irradiates an irradiated object from a light emitting surface along a longitudinal direction, the image reading apparatus including a support member that supports the light emitting element so as to face the end surface of the light guide member, A concave portion is formed on the side wall of the support member so as to surround the light emitting element, and a part of the inner wall of the concave portion is notched and opened.

According to this configuration, the image reading apparatus moves in the sub-scanning direction when reading the image of the document placed on the document placing table, so that air flows from the open portion of the concave portion to the periphery of the light emitting element. Therefore, the effect of cooling the light emitting element and its peripheral part can be obtained by the inflow air.

According to the image reading apparatus of the present invention, in the concave portion, it is preferable that an opening portion which is open to the sub-scanning direction is provided.

  According to this configuration, air can be efficiently flowed toward the light emitting element by opening the opening portion in the sub-scanning direction.

  Further, according to the image reading apparatus of the present invention, the opening may be configured to be inclined with respect to the sub-scanning direction. More specifically, the opening may be configured to be inclined in a direction away from the irradiated body.

  According to this configuration, by tilting the opening in the direction away from the irradiated body, the ratio of leakage light from the opening to the irradiated body near the reading section, that is, stray light can be reduced.

  According to the image reading apparatus of the present invention, the inner peripheral surface of the opening may be a curved surface that guides air flowing from the opening to the light emitting element.

  According to this configuration, most of the air flowing from the opening can be supplied to the periphery of the light emitting element, so that the cooling effect can be enhanced.

  According to another aspect of the present invention, there is provided an image forming apparatus comprising: the image reading apparatus having the above-described configuration; and a printing unit that prints an image of the irradiated object read by the image reading apparatus on a recording sheet. Yes.

According to the present invention, when the image reading apparatus moves in the sub-scanning direction when reading an image of a document, air flows into the periphery of the light emitting element from the open portion of the recess . Therefore, the peripheral portion including the light emitting element and the substrate can be efficiently cooled by the inflowing air.

1 is a schematic perspective view showing an image forming apparatus according to the present invention. 1 is a schematic longitudinal sectional view showing an image forming apparatus according to the present invention. 2 is a schematic longitudinal sectional view of an automatic document feeder, a document reading unit, and a document placing table. FIG. 1 is a schematic perspective view illustrating a schematic configuration of a light source unit according to a first embodiment. 1 is a schematic longitudinal sectional view of a light source unit according to a first embodiment. 2 is an enlarged schematic cross-sectional view showing one end of the light source unit according to Embodiment 1. FIG. FIG. 2 is a schematic perspective view showing an enlarged end portion of the light source unit according to the first embodiment. 2 is an enlarged schematic cross-sectional view showing one end of the light source unit according to Embodiment 1. FIG. It is a schematic perspective view which expands and shows the one end part of the light source unit concerning Embodiment 2. FIG. It is a front view of the holder member which comprises the light source unit concerning Embodiment 2. FIG. It is a side view of the holder member which comprises the light source unit concerning Embodiment 2. FIG. It is a schematic perspective view which expands and shows the one end part of the light source unit concerning Embodiment 3. It is a front view of the holder member which comprises the light source unit concerning Embodiment 3. FIG. It is a side view of the holder member which comprises the light source unit concerning Embodiment 3. FIG. It is a schematic perspective view which expands and shows the one end part of the light source unit concerning Embodiment 4. It is a front view of the holder member which comprises the light source unit concerning Embodiment 4. FIG. 10 is an enlarged schematic cross-sectional view showing one end portion of a light source unit according to a fifth embodiment.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic perspective view showing an image forming apparatus 100 equipped with an image reading apparatus according to the present invention, and FIG. 2 is a schematic longitudinal sectional view thereof. The image forming apparatus 100 includes an apparatus main body 110 and an automatic document feeder 120. The apparatus main body 110 further includes a document reading unit 90 that reads an image of a document and a document placement table 92 on which the document is placed. Yes.

  The document reading unit 90 is provided on the upper part of the apparatus main body 110. The document placing table 92 is made of transparent glass and is provided on the upper side of the document reading unit 90. The automatic document feeder 120 is attached to the upper side of the document placement table 92 and automatically conveys the document onto the document placement table 92. The automatic document feeder 120 is configured to be rotatable about an axis connecting the apparatus main body 110 and the automatic document feeder 120, and the document is placed manually by opening the document table 92. Can be done.

  The automatic document feeder 120, the document reading section 90, and the document placing table 92 constitute a document reading device (image reading device) according to the present invention.

  The image forming apparatus 100 forms multi-color and single-color images on a predetermined sheet (original) in accordance with the original image read by the original reading apparatus or image data received from the outside.

  The apparatus main body 110 includes an exposure unit 1, a developing device 2, a photosensitive drum 3, a cleaner unit 4, a charger 5, an intermediate transfer belt unit 6, a fixing unit 7 and a secondary transfer unit 10. The image data handled in this image forming apparatus corresponds to a color image using each color of black (K), cyan (C), magenta (M), and yellow (Y). Accordingly, four developing devices 2, photosensitive drums 3, charging devices 5, and cleaner units 4 are provided to form four types of latent images corresponding to the respective colors, and are respectively provided in black, cyan, magenta, and yellow. These are set to form four image stations.

  The image forming apparatus 100 further includes a paper feed cassette 81, a manual paper feed cassette 82, and a paper discharge tray 91.

  FIG. 3 is a schematic longitudinal sectional view of the document reading apparatus shown in FIGS. 1 and 2, that is, the automatic document feeder 120, the document reading unit 90, and the document placing table 92.

The document reading unit 90 includes a light source unit 140 including a light source unit 129, a mirror unit 141, a condenser lens 142, and an image sensor (CCD here) 143. The light source unit 129 includes a light emitting element 144 and a light guide member 130 which will be described later. 0
The document placing table 92 is made of a transparent glass plate, and both ends in the main scanning direction are placed on the frame of the document reading unit 90. The automatic document feeder 120 can be opened and closed with respect to the document reading unit 90 about an axis along the sub-scanning direction (the direction along the arrow X in FIG. 3) (for example, supported by a hinge). The lower surface of the automatic document feeder 120 also serves as a document cover 50 (see FIG. 3) that presses the document G placed on the document placing table 92 of the document reading unit 90 from above.

  The document reading apparatus is configured to read a document image by fixing the document G by a document fixing method and to read a document image by moving the document G by a document moving method.

  When the original image of the original G is read by the original fixing method, the light source unit 140 irradiates the original G placed on the original placement base 92 with light through the original placement base 92 at a constant speed in the sub-scanning direction. The image of the original G is scanned by moving to one side of X. At this time, the light source unit 129 emits light from below the document placing table 92 toward the placement surface on which the document G is placed. At the same time, the mirror unit 141 moves to one side in the sub-scanning direction X at a movement speed that is ½ of the movement speed of the light source unit 140.

  The reflected light (reading light) from the original G illuminated by the light source unit 140 is reflected by the first mirror provided in the light source unit 140, and then the optical path is changed by the second and third mirrors of the mirror unit 141. An image is formed on the image sensor 143 through the condenser lens 142, and the original image light is read and converted into electrical image data.

  On the other hand, when the original image of the original G is read by the original movement method, the automatic original feeder 120 keeps the light source unit 140 and the mirror unit 141 at the positions shown in FIG. It is conveyed to one side in the sub-scanning direction X so as to pass through the upper part.

  Then, light from the light source unit 140 is irradiated through the original reading glass 93 to one surface of the original G that has passed over the original reading glass 93 and reflected by the one surface. The light reflected from the document G is optically path-converted from the first mirror 146 to the second mirror and then the third mirror in the same manner as the document fixing method described above, and forms an image on the image sensor 143 through the condenser lens 142. The original image is read and converted into electrical image data.

  The light source unit 140 according to the embodiment of the present invention can be configured to include one or more light guide members. Here, the light source unit 140 including the two light guide members 130 will be described below as an example.

<Embodiment 1>
4 is a schematic perspective view showing a schematic configuration of the light source unit 140 according to the first embodiment, FIG. 5 is a schematic longitudinal sectional view of the light source unit 140 according to the first embodiment, and FIG. FIG. 7 is an enlarged schematic perspective view showing one end portion of the light source unit 140 according to the first embodiment.

  The light source unit 140 includes a light emitting element 144, a frame 145, a first mirror 146, a light source substrate (substrate) 147 on which the light emitting element 144 is mounted, a light source driving circuit board 148, a heat sink 149, a holder member ( Support member) 150 and a light guide member 130.

  The frame 145 is a member that fixes and supports other members by processing predetermined portions of a plate-like member that is long in the main scanning direction by punching or bending. The plurality of holes provided in the frame 145 are used for attaching other members with screws or the like. Further, the bent portion that is erected with respect to the bottom is used for positioning and fixing each member.

  The first mirror 146 has a reflection film formed on one surface of the glass by silver vapor deposition, and has a reflection surface on which the reflection film is formed, an end surface substantially orthogonal to the reflection surface, and a back surface facing the reflection surface. The cross-sectional shape is substantially rectangular and the corners are chamfered. The first mirror 146 is fixed to the frame 145 by a mirror holder (not shown), and is arranged at a predetermined position and a predetermined angle on the optical path of the reading light reflected by the document. The first mirror 146 is a mirror on which the reading light that has passed through a slit of the holder member 150 (described later) first enters, and is positioned substantially immediately below the slit.

  The light source substrate 147 is a member in which the light emitting element 144 is mounted on the surface of a printed wiring board or the like. As shown in FIG. 4, the light source substrate 147 is attached to the holder member 150 so that the mounted light emitting element 144 faces both end faces of the light guide member 130. As the light-emitting element 144, an LED (Light Emitting Diode) is most suitable because it has the characteristics of downsizing the device and as a point light source, but other types of semiconductor elements, light bulbs, and the like can be used instead of the LED. You may apply.

  The light source drive circuit board 148 is a board on which a drive circuit for driving and controlling the light emitting element 144 mounted on the light source board 147 is mounted, and is attached to the outside of the holder member 150 on the frame 145. One end of a harness (not shown) is connected to the light source drive circuit board 148. The other end of the harness is extended along the periphery of the holder member 150 and connected to the light source substrate 147, and the power for driving the light emitting element 144 transmits a control signal.

  The heat radiating plate 149 is a plate-like member formed of a metal having high thermal conductivity, and is disposed in thermal contact with the back surface of the light source substrate 147. Therefore, heat generated by the light emitting element 144 emitting light is transmitted to the heat radiating plate 149 via the back surface of the light source substrate 147 and is dissipated to the outside.

  The holder member 150 is a member that holds the two light guide members 130, and has a frame-shaped wall portion 151 that is long in the main scanning direction, and a mounting recess on the side surface of a substantially semi-cylindrical body that is formed integrally with the wall portion 151. 152. The wall 151 is provided so as to stand in a substantially vertical direction with respect to the bottom surface of the frame 145. The wall portion 151 includes a long plate portion 153 along the main scanning direction (a direction along arrow Y in FIGS. 4 and 6), and a short plate portion 154 along the sub-scanning direction X orthogonal to the main scanning direction Y. In the wall portion 151, two mounting recesses 152 are formed in parallel with a predetermined interval with the recesses facing the document surface side. The short plate portion 154 is provided with a boss portion (cylindrical protrusion) 154a serving as a screw hole for fixing the light source substrate 147 and the heat radiating plate 19 with screws. A slit St (see FIG. 4) through which reading light, which will be described later, passes between the two mounting recesses 152, and the boss portion 154a is open to the slit St. The light guide member 130 is positioned and fixed in each mounting recess 152.

  The light guide member 130 is made of a long translucent body extending in the main scanning direction with a substantially cylindrical shape having translucency, and light incident surfaces 131 are formed on both end surfaces in the longitudinal direction of the translucent body, The light emitting surface 132 is formed on the side surface along the longitudinal direction of the light transmitting body (upper half of the upper surface side in FIG. 5), and the other side surface facing the light emitting surface 132 along the longitudinal direction of the light transmitting body (in FIG. 5). A light reflecting surface 133 is formed on the lower half of the lower surface side. The light guide member 130 is formed by molding acrylic resin with a mold.

  Further, the light reflecting surface 133 of the light guide member 130 is formed in a minute triangular shape (for example, a sawtooth shape) when viewed from the width direction along the light emitting surface 132. Further, from the viewpoint of improving the light quantity as it goes to the center in the longitudinal direction, the interval between the peaks of the reflective surfaces formed in a triangular shape gradually decreases as it goes to the center in the longitudinal direction. The shape of the reflecting surface is not limited to the saw-tooth shape, and may be other shapes, and may be formed by molding, blasting, or printing techniques as long as it is designed to reflect light uniformly.

In such a configuration of the light source unit 140, the light emitting elements 144 are disposed to face the light incident surfaces 131 at both ends of the light guide member 130, respectively. Therefore, through holes 155 are formed in the short plate portion 154 of the wall portion 151 so as to surround the periphery of each light emitting element 144. The through hole 155 has a short cylindrical shape that prevents light leakage by inserting a first through hole 155a having a short cylindrical shape surrounding the periphery of the light emitting element 144 and an end surface portion that is the light incident surface 131 of the light guide member 130. The second through hole 155b. The thickness of the first through hole 155a is slightly larger than the thickness of the light emitting element 144 (that is, the height from the mounting surface of the light source substrate 147 to the light emitting surface 144a). Accordingly, the light incident surface 131 of the light guide member 130 inserted into the second through hole 155b of the short plate portion 154 and the light emission surface of the light emitting element 144 included in the first through hole 155a of the short plate portion 154. 144a and is Ru are opposed in close proximity.

  Therefore, the light emitted from each light emitting element 144 is incident on the light incident surface 131 of the light guide member 130 disposed so as to face the light guide member 130, and is directly emitted from the light output surface 132. Alternatively, the light is reflected by the light reflecting surface 133 and emitted from the light emitting surface 132.

  The light exit surface 132 of each light guide member 130 is directed to the same location of the document via the document placement table 92, and each light emitted from the light exit surface 132 of each light guide member 130 is the same as that of the document. The incident light is incident on the spot, and the spot of the document is illuminated. The reflected light reflected at the spot of the document reaches the first mirror 146 through the slit St as the reading light and is reflected toward the mirror unit 141.

  In such a configuration, in the first embodiment, as shown in FIGS. 6 and 7, the upper corner portion of the short plate portion 154 is notched so that a part of the through hole 155 is opened. ing. More specifically, a side wall portion facing the sub scanning direction X of the short plate portion 154 surrounding the through hole 155 and a part of the upper wall portion following the side wall portion are removed to form an opening portion 156. Yes. That is, when the short plate portion 154 is viewed from the sub-scanning direction X, the light emitting element 144 contained in the first through hole 155a is completely exposed through the opening portion 156. In the first embodiment, almost ¼ or more of the entire circumference of the through hole 155 is removed.

  As a result, the light source unit 140 moves in the sub-scanning direction X when reading the image of the document placed on the document placement table 92, so that the opening portion 156 in which the short plate portion 154 is cut out and around the light emitting element 144. Air flows in, and the peripheral portion including the light emitting element 144 and the light source substrate 147 is cooled by the inflowing air.

  In this case, when the light source unit 140 is moved in the sub-scanning direction X1 in FIG. 6, air flows from the opening portion 156 on the right side in the drawing along with this movement. This inflow air mainly passes through the peripheral portion of the right side light emitting element 144 and then passes so as to flow along the peripheral surface portion of the boss portion 154a. A part of the inflowing air reaches the left side light emitting element 144, and the left side The path that flows out from the open portion 156 to the outside of the light source unit 140 is traced. Of course, there is a path in which a part of the air flowing in from the right opening 156 diffuses in the other direction.

  On the other hand, when the light source unit 140 is moved in the sub-scanning direction X2 in FIG. 6, air flows in from the left opening 156 in the drawing along with this movement. The inflow air mainly passes through the periphery of the left side light emitting element 144 and then passes so as to flow along the peripheral surface portion of the boss part 154a. A part of the inflowing air reaches the right side light emitting element 144 and reaches the right side. The path that flows out from the open portion 156 to the outside of the light source unit 140 is traced. Of course, there is a path in which part of the air flowing in from the left opening 156 diffuses in the other direction. FIG. 8 shows the main flow of the air E at this time in both directions.

<Embodiment 2>
9 is an enlarged schematic perspective view showing one end portion of the light source unit 140 according to the second embodiment, FIG. 10 is a front view of a holder member constituting the light source unit 140 according to the second embodiment, and FIG. FIG. 5 is a side view of a holder member constituting the light source unit 140 according to the second embodiment.

  In the first embodiment, the open portion 156 is formed by removing a side wall portion facing the sub-scanning direction X of the short plate portion 154 surrounding the through hole 155 and a part of the upper wall portion following the side wall portion. ing. Thus, the cooling effect can be improved by taking the open part 156 large. However, on the other hand, since the upper wall portion is also removed, a part of the light emitted from the light emitting element 144 leaks outside without being incident on the light guide member 130, so that the amount of light incident on the light guide member 130 is reduced. May be reduced. Therefore, in the second embodiment, the large open portion as in the first embodiment is not used, but the short plate portion 154 surrounding the through hole 155 is arranged in the sub scanning direction X on the side wall portion facing the sub scanning direction X. Along with this, an opening hole (opening) 157 is formed. That is, the upper wall portion is not removed. In other words, the inner surface of the opening hole 157 has a three-surface structure of an upper surface, a lower surface, and a side surface when viewed from the sub-scanning direction X, and is formed in a U shape, but on the remaining surface (a surface facing the side surface). Becomes a single opening hole that is blocked by the contact of the light source substrate 147. The same applies to the following embodiments.

  As a result, the light source unit 140 moves in the sub-scanning direction X when reading an image of the document placed on the document placement table 92, thereby causing the light emitting element 144 to pass through the opening hole 157 formed in the side wall portion of the short plate portion 154. The air flows into the periphery of the light source, and the peripheral portion including the light emitting element 144 and the light source substrate 147 is cooled by the inflow air. The air flow at this time is also the same as the air flow shown in FIG. 8 described in the first embodiment.

<Embodiment 3>
12 is an enlarged schematic perspective view showing one end portion of the light source unit 140 according to the third embodiment, FIG. 13 is a front view of a holder member constituting the light source unit 140 according to the third embodiment, and FIG. FIG. 5 is a side view of a holder member constituting the light source unit 140 according to the third embodiment.

  In Embodiment 2, the opening hole 157 is formed along the sub-scanning direction X. Even in this case, a part of the light emitted from the light emitting element 144 is output to the outside from the opening hole 157 as stray light. It will be. In that case, the stray light reflected in the opening hole 157 may be irradiated in the vicinity of the reading portion of the read document depending on the reflection angle.

  Therefore, in the third embodiment, the opening hole (opening) 158 is provided to be inclined with respect to the sub-scanning direction X. Specifically, the opening 158 is provided so as to be inclined (downward) in a direction away from an irradiated body that is a document placed on the document placement table 92.

  As a result, the light source unit 140 moves in the sub-scanning direction X when reading the image of the document placed on the document placement table 92, so that the light emitting element 144 is released from the opening hole 158 formed in the side wall portion of the short plate portion 154. The air flows into the periphery of the light source, and the peripheral portion including the light emitting element 144 and the light source substrate 147 is cooled by the inflow air. The air flow at this time is also basically the same as the air flow shown in FIG. 8 described in the first embodiment.

  In the third embodiment, the opening 158 is inclined in a direction away from the irradiated body. Even in this case, a part of the light emitted from the light emitting element 144 is output to the outside as stray light from the opening hole 158. The reflection angle of the stray light reflected in the opening hole 158 depends on the reading position of the read document. Therefore, the possibility of stray light being irradiated near the reading portion is extremely low. Therefore, in Embodiment 3, both the cooling effect and the stray light countermeasure can be achieved.

<Embodiment 4>
FIG. 15 is an enlarged schematic perspective view showing one end portion of the light source unit 140 according to the fourth embodiment, and FIG. 16 is a front view of a holder member constituting the light source unit 140 according to the fourth embodiment.

  In the fourth embodiment, the configuration of the third embodiment is further improved.

  That is, in the third embodiment, the opening hole (opening) 158 is linearly provided with an inclination with respect to the sub-scanning direction X. However, in the fourth embodiment, the inner surface of the opening hole 158 is gently and substantially omitted. It is curved in an S shape. As a result, the air that has flowed into the holder member 150 through the opening hole 158 is guided by the curved surface of the opening hole 158 and flows toward the light emitting element 144, so that the light emitting element 144 can be efficiently cooled.

  In the fourth embodiment, the opening 158 is curved in a direction away from the irradiated body. Even in this case, a part of the light emitted from the light emitting element 144 is output to the outside as stray light from the opening hole 158. The reflection angle of the stray light reflected in the opening hole 158 depends on the reading position of the read document. Therefore, the possibility of stray light being irradiated near the reading portion is extremely low. Therefore, also in the fourth embodiment, both the cooling effect and the countermeasure against stray light can be achieved as in the third embodiment.

<Embodiment 5>
FIG. 17 is an enlarged schematic cross-sectional view of one end portion of the light source unit 140 according to the fifth embodiment.

  Although Embodiment 5 can be applied to any form from Embodiment 2 to Embodiment 4, here, a case where it is applied to Embodiment 2 will be described.

  That is, when viewed from the sub-scanning direction X, the inner surface of the opening hole 157 has a three-surface structure of an upper surface, a lower surface, and a side surface, and is formed in a U shape. In the fifth embodiment, the side surface 157 a is a gentle, substantially S-shaped curved surface that guides air flowing from the opening hole 157 to the light emitting element 144.

  According to this configuration, most of the air flowing from the opening hole 157 can be flown in the direction along the light emitting surface 144a of the light emitting element 144, so that the cooling effect can be enhanced.

  It should be noted that the embodiment disclosed herein is illustrative in all respects and does not serve as a basis for limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiment, but is defined based on the description of the scope of claims. Moreover, all the changes within the meaning and range equivalent to a claim are included.

50 Document cover 90 Document reading unit (document reading device)
92 Document Placement (Document Reading Device)
100 Image forming apparatus 120 Automatic document feeder (document reading device, document cover)
DESCRIPTION OF SYMBOLS 130 Light guide member 131 Light incident surface 132 Light output surface 133 Light reflective surface 140 Light source unit 143 Image pick-up element 144 Light emitting element (LED)
144a Light exit surface 145 Frame 146 First mirror 147 Light source substrate (substrate)
148 Light source drive circuit board 149 Heat sink 150 Holder member (support member)
151 Wall portion 152 Mounting recess 153 Long plate portion 154 Short plate portion 154a Boss portion (cylindrical protrusion)
155 Through hole 155a First through hole 155b Second through hole 157,158 Open hole (opening)
157a Side St slit

Claims (6)

A light-emitting element and a long light guide member, and guides the light from the light-emitting element from the end face of the light guide member to the inside, and irradiates the irradiated object from the light emitting surface along the longitudinal direction. An image reading apparatus including an illumination unit that performs
A support member that supports the light-emitting element to face the end surface of the light guide member;
A concave portion is formed on a side wall of the support member so as to surround the light emitting element, and a part of an inner wall of the concave portion is cut out and opened. The image reading apparatus according to claim 1,
An image reading apparatus, wherein the recess is provided with an opening that is open in a sub-scanning direction. The image reading apparatus according to claim 2,
The image reading apparatus, wherein the opening is provided to be inclined with respect to the sub-scanning direction. The image reading apparatus according to claim 3,
The image reading apparatus, wherein the opening is inclined in a direction away from the irradiated body. An image reading apparatus according to any one of claims 2 to 4,
An image reading apparatus, wherein an inner peripheral surface of the opening is a curved surface that guides air flowing from the opening to the light emitting element. An image reading apparatus according to any one of claims 1 to 5,
An image forming apparatus comprising: a printing unit that prints an image of the irradiated object read by the image reading apparatus on a recording sheet.

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