JP5891583B2 - Image reading device - Google Patents

Description

  The present invention relates to an image reading apparatus that reads an image of an object by guiding light from a light source with a light guide member to irradiate the object and detecting light from the object.

  In image scanners, facsimiles, copiers, financial terminal devices, etc., contact image sensor modules (hereinafter abbreviated as “CIS modules”) are used as image reading devices. The CIS module irradiates the reading object with light and detects the reflected light at this time with an optical sensor, thereby reading an image of the reading object. In order to appropriately guide reflected light from the reading object to the optical sensor, it is common to use an imaging optical system having an imaging magnification of erecting equal magnification. That is, the imaging optical system forms an image of the light reflected by the reading object at an erecting equal magnification, and forms an erecting equal magnification image of the reading object toward the optical sensor. The optical sensor can read the image of the reading object by detecting the erecting equal-magnification image formed by the imaging optical system.

  By the way, Patent Document 1 describes an imaging optical system in which light is reflected by a roof prism and the direction of the optical axis is changed (the optical axis is bent) for the purpose of downsizing the CIS module. In this imaging optical system, an object-side lens disposed opposite to the reading object and an imaging-side lens that cooperates with the object-side lens and connects the image of the reading object to the imaging surface are provided. ing. A roof prism is disposed in the optical path from the object side lens to the imaging side lens. Therefore, the light reflected by the reading object and transmitted through the object side lens is reflected by the roof prism lens and changes its traveling direction toward the imaging side lens. Thus, the CIS module can be reduced in size by changing the traveling direction of light by the reflecting surface (roof prism).

Japanese Unexamined Patent Publication No. 2000-066134

  By the way, the image reading apparatus requires illumination means for irradiating light to an object. In Patent Document 1, an illumination light source is provided as such illumination means. However, in order to appropriately irradiate the object with the light generated by the light source, in addition to the illumination light source as shown in Patent Document 1, a light guide that guides the light generated by the light source and irradiates the object may be provided. Preferred. However, it may be difficult to reduce the size of the image reading apparatus by separately providing a light guide in addition to the light source.

  In addition, it may be difficult to reduce the size of the image reading apparatus for the following reasons. That is, in the image reading apparatus provided with the photosensor and the light source as described above, it is necessary to provide a substrate for mounting the photosensor and the light source. However, if a substrate is provided for each of the optical sensor and the light source, it may be difficult to reduce the size of the image reading apparatus.

  The present invention has been made in view of the above-described problems, and enables downsizing of an image reading apparatus that guides light from a light source to an object by a light guide member and reads light from the object by an optical sensor. The purpose is to provide technology.

  In order to achieve the above object, an image reading apparatus according to the present invention includes a light source, a light guide member that guides light emitted from the light source to irradiate the object, and light from the object in a first direction. The light is reflected in the second direction intersecting the first direction by the reflective surface arranged in one direction, and the light reflected by the reflective surface is directed in the second direction by the emitting portion arranged in the second direction of the reflective surface. An imaging optical system that converges and forms an erecting equal-magnification image of the object in the second direction of the emission unit, and an imaging optical system that is disposed in the second direction of the emission unit of the imaging optical system are connected. An optical sensor for detecting the imaged erect life-size image, the light guide member is disposed on the object side of the emitting portion in the first direction, and the light source is disposed in the second direction of the light guide member. And the light source are mounted on the same substrate disposed in the second direction of the imaging optical system and the light guide member. It is characterized in that.

  In the invention (image reading apparatus) configured as described above, the light traveling from the object in the first direction is reflected in the second direction in which the reflection surface arranged in the first direction of the object intersects the first direction. That is, the reflective surface arranged in the first direction of the object changes the direction of light from the object from the first direction to the second direction. Further, an emission part is disposed in the second direction of the reflection surface, and the emission part converges the light reflected by the reflection surface in the second direction. Thus, in the configuration in which the light traveling in the first direction from the object to the reflecting surface is converged in the second direction by the emitting unit, a space can be created on the object side of the emitting unit. Therefore, in the present invention, a light guide member that guides light from the light source to the object is disposed in this space. Therefore, it is possible to reduce the size of the image reading apparatus despite having a light guide member in addition to the light source.

  In this way, the light guide member is arranged in the space that is vacant on the object side of the emission part of the imaging optical system. In other words, the emission part of the imaging optical system and the light guide member are arranged side by side in the first direction. ing. Furthermore, in the present invention, the image reading apparatus is reduced in size by taking advantage of such an arrangement as follows. That is, the imaging optical system forms an erecting equal-magnification image toward the optical sensor, and the light guide member guides light emitted from the light source. Therefore, it is necessary to dispose an optical sensor and a light source for each of the imaging optical system and the light guide member. In contrast, in the configuration in which the imaging optical system and the light guide member are arranged side by side in the first direction, both the optical sensor and the light source are collectively arranged in the second direction of the imaging optical system and the light guide member. be able to. Therefore, in the present invention, the optical sensor and the light guide member are arranged in the second direction of the imaging optical system and the light guide member. In addition, a substrate is disposed in the second direction of the imaging optical system and the light guide member, and the optical sensor and the light source are mounted on the same substrate. As a result, it is possible to reduce the size of the image reading apparatus.

  Note that the imaging optical system may guide the light traveling from the object in the first direction to the reflection surface by the incident portion arranged on the object side of the reflection surface. With such a configuration, there is an advantage that light from an object can be appropriately guided to the reflecting surface, and it is possible to improve light utilization efficiency.

  More specifically, the incident unit has an incident lens on the surface facing the object, and guides light from the object in the first direction to the reflection surface by the incident lens, and the emission unit serves as an optical sensor. An exit lens may be provided on the opposite surface, and the light reflected by the reflecting surface may be converged in the second direction by the exit lens.

  Furthermore, the imaging optical system has a configuration in which an incident part extending in the first direction, an emission part extending in the second direction, and a connection part connecting the incident part and the emission part are integrally formed of a transparent medium. The connecting portion from the incident portion to the emitting portion has a shape bent from the first direction to the second direction, and the reflection surface is provided on the outer peripheral surface of the connection portion bent from the first direction to the second direction. You may comprise. In such a configuration, the incident lens of the incident portion, the reflection surface of the connection portion, and the emission lens of the emission portion are integrally formed of a transparent medium, and air is interposed between the incidence lens, the reflection surface, and the emission lens. do not do. Therefore, there is an advantage that light is not scattered at the interface with the air, and it is possible to improve the light use efficiency.

  Alternatively, the emission unit is composed of a plurality of lenses arranged in the second direction, and the imaging optical element converges the light reflected from the reflecting surface by the plurality of lenses to form an erecting equal-magnification image. You may comprise so that it may do.

  In addition, the exit section is composed of a gradient index lens, and the imaging optical element converges the light reflected by the reflecting surface by the gradient index lens to form an erect life-size image. You may comprise as follows.

  Incidentally, the second direction can be a direction orthogonal to the first direction.

1 is a partial cross-sectional perspective view showing a schematic configuration of an embodiment of an image reading apparatus according to the present invention. The perspective view which shows a lens array etc. FIG. FIG. 3 is a ray diagram of an imaging optical system including a first lens, a reflective film, and a second reflective film. The schematic diagram which shows the modification of an imaging optical system. The schematic diagram which shows another modification of an imaging optical system.

First Embodiment FIG. 1 is a partial sectional perspective view showing a schematic configuration of a CIS module which is an embodiment of an image reading apparatus according to the present invention. FIG. 2 is a perspective view showing the entrance-side aperture member, the lens array, and the exit-side aperture member. In these FIG. 1, FIG. 2, and the figure demonstrated below, in order to show the positional relationship of each member, XYZ rectangular coordinates shall be shown suitably. Further, the arrow side of the coordinate axis is defined as the positive side, and the opposite side of the coordinate axis is defined as the negative side. Further, in the following description, the negative side in the Z direction is the upper side, the positive side in the Z direction is the lower side, the negative side in the Y direction is the left side, the positive side in the Y direction is the right side, and the negative side in the X direction is The front side and the positive side in the X direction are appropriately handled as the rear side.

  The CIS module 1 is a device that reads an image printed on a document OB using a document OB placed on the document glass GL as a reading object, and is disposed immediately below the document glass GL. The CIS module 1 has a substantially rectangular parallelepiped frame 2 extending longer than the maximum reading range in the X direction, and an illumination unit 3, an incident side aperture member 4, a lens array 5, and an exit side aperture member 6 in the frame 2. The optical sensor 7 and the printed circuit board 8 are arranged.

  In this frame 2, a first storage space SP1 that houses an illumination unit 3 that illuminates the document OB, and first functional units 4, 5, 6, 7, and 8 that read images of the document OB are stored. Two storage spaces SP2 are separated by a separator 21. The first accommodation space SP1 is provided at an upper position in the frame 2. On the other hand, the second accommodation space SP2 is provided so as to sink into the first accommodation space SP1 from the left side in a section including the YZ plane (hereinafter referred to as “sub-scanning section”). More specifically, the second accommodation space SP2 is a vertical space SP2a extending in the Z direction (up and down direction) on the left side of the first accommodation space SP1, and a left and right space extending in the Y direction (left and right direction) from the lower end of the vertical space SP2a. It consists of SP2b. Thus, a second accommodation space SP2 that is bent at a right angle from the vertical space SP2a and reaches the left and right space SP2b is formed.

  The illumination unit 3 includes a light guide 31 and a light source 32 accommodated in the first accommodation space SP1. The light source 32 is an LED (Light Emitting Diode) arranged in the Y direction (right direction) of the light guide 31 and emits illumination light toward the negative side (left direction) in the Y direction. Illumination light emitted from the light source 32 is guided to one end face (end face on the X direction negative side) of the light guide 31 by a member (not shown), and enters the inside of the light guide 31 from this one end face. As shown in FIG. 1, the light guide 31 extends in the X direction on the upper surface of the separator 21 by substantially the same length as the maximum reading range. Then, after the illumination light is incident from one end face, the illumination light is partially emitted from the front end portion (light emission surface) at each part of the light guide 31 while propagating in the X direction in the light guide 31 (arrow in FIG. 1). reference). Light emitted from the light guide 31 (the front end) toward the irradiation position LP diagonally to the left is irradiated onto the document OB on the document glass GL. Thus, the strip-shaped illumination light extending in the X direction is applied to the document OB and reflected by the document OB.

  The upper vertical space SP2a described above is provided immediately below the irradiation position LP where the light guide 31 irradiates the document OB with illumination light, and the incident side aperture member 4 is disposed at the upper end thereof. The incident side aperture member 4 extends in the X direction by substantially the same length as the maximum reading range. The incident side aperture member 4 has a plurality of through holes 41 arranged in a line at a predetermined pitch in the X direction, and functions as an incident side aperture for the plurality of first lenses LS1 provided in the lens array 5, respectively.

  The lens array 5 extends in the X direction by substantially the same length as the maximum reading range, and the entire lens array 5 can be completely inserted into the second accommodation space SP2. This lens array 5 has a first lens LS1 (incident side lens) convex upward facing the original document OB (irradiation position LP) and a right side opposite to the optical sensor 7 below the right side of the first lens LS1. It is composed of a convex second lens LS2 (exit side lens) and a light guide 51 that connects the first and second lenses LS1 and LS2.

  In the sub-scan section, the light guide 51 includes an incident part 51a extending in the Z direction, a curved part 51b curved in the Y direction from the lower end of the incident part 51a, and an emission part 51c extending in the Y direction from the right end of the curved part 51b. It consists of As described above, the light guide 51 is bent at a right angle from the X direction to the Y direction at the curved portion 51b from the incident portion 51a to the emission portion 51c. On the upper surface of the incident portion 51a of the light guide portion 51, a plurality of first lenses LS1 are arranged in a line at a predetermined pitch in the X direction so as to correspond to the plurality of through holes 41 of the incident side aperture member 4 on a one-to-one basis. . In addition, on the right end surface of the emission part 51c of the light guide part 51, a plurality of second lenses LS2 are arranged in a line at a predetermined pitch in the X direction so as to correspond to the plurality of first lenses LS1 on a one-to-one basis. The illumination light incident on the first lens LS1 is guided to the second lens LS2 by the light guide 51.

  In addition, a reflective film 511 is formed on the light guide 51 in order to guide incident light from the first lens LS1 to the second lens LS2. The reflective film 511 is a metal film deposited on the outer peripheral surface of the curved part 51b that bends from the incident part 51a to the emission part 51c of the light guide part 51, and illuminates the illumination light incident in the Z direction from the first lens LS1. Reflect on. Thus, the light reflected from the original OB at the illumination light irradiation position LP travels in the Z direction and enters the first lens LS1.

  The lens array 5 configured in this way forms an image of the light reflected from the original OB at the illumination light irradiation position LP in the Y direction (FIG. 3). FIG. 3 is a ray diagram of the imaging optical system including the first lens, the reflective film, and the second reflective film. As shown in FIG. 3, the light reflected by the original OB and traveling in the X direction is guided to the reflective film 511 by the first lens LS1. As described above, the first lens LS1 can appropriately guide the light from the document OB in the Z direction to the reflection film 511, thereby improving the light use efficiency. The light guided from the document OB to the reflection film 511 is reflected by the reflection film 511 in the Y direction, and then converged in the Y direction by the second lens LS2. Thus, an erecting equal-magnification image of the original OB is formed on the sensor surface of the optical sensor 7 in the Y direction of the second lens LS2.

  Incidentally, the plurality of first lenses LS1, the light guide portions 51 (51a, 51b, 51c) and the plurality of second lenses LS2 are integrally formed by a transparent medium such as resin or glass having light transmittance with respect to illumination light. Is formed. Accordingly, the illumination light incident on the first lens LS1 travels through the transparent medium from the first lens LS1 to the second lens LS2 via the reflective film 511. That is, no air is interposed between the first lens LS1, the reflective film 511, and the second lens LS2, so that light is not scattered at the interface with the air, and the light use efficiency is improved. Is possible. When the lens array 5 is integrally formed, each part (for example, the first lens LS1, the light guide part 51, and the second lens LS2) is formed separately and then bonded and integrated. Alternatively, the entire lens array 5 may be integrally formed without forming each part separately.

  The lens array 5 configured in this way is arranged from the middle of the vertical space SP2a of the second accommodation space SP2 to the middle of the left and right space SP2b. On the other hand, in the left and right space SP2b, the exit side aperture member 6 and the optical sensor 7 are arranged in the Y direction in this order on the right side of the exit portion 51c of the lens array 5. As with the incident side aperture member 4, the exit side aperture member 6 extends in the X direction by substantially the same length as the maximum reading range, and a plurality of through holes 61 are arranged in a row in the X direction. The plurality of through holes 61 are provided in one-to-one correspondence with the plurality of second lenses LS2, and each through hole 61 functions as an exit aperture of the corresponding second lens LS2. The optical sensor 7 detects the light emitted from the second lens LS2 and passed through the exit-side aperture member 6, thereby reading an erecting equal-magnification image formed by the lens array 5.

  In this way, the light guide 31 and the light source 32 are arranged in the Y direction in the first accommodation space SP1, and the lens in the left and right space SP2c (second accommodation space SP2) below the first accommodation space SP1. The array 5 (the emission part 51c) and the optical sensor 7 are arranged side by side in the Y direction. In addition, at the ends in the Y direction of the first accommodation space SP1 and the left and right space SP2b, the first accommodation space SP1 and the left and right space SP2b communicate with each other in the Z direction. And the printed circuit board 8 which straddles 1st accommodation space SP1 and right-and-left space SP2b in a Z direction is arrange | positioned in this communication part.

  On this printed circuit board 8, the optical sensor 7 and the light source 32 are mounted. The light source 32 emits light based on the control signal received from the printed circuit board 8, and the optical sensor 7 delivers a signal related to the read image to the printed circuit board 8.

  As described above, in this embodiment, the reflection film 511 (reflecting surface) arranged in the Z direction of the original OB crosses the light traveling in the Z direction (first direction) from the original OB (object). Reflects in the direction (second direction). That is, the reflective film 511 arranged in the Z direction of the document OB changes the direction of light from the document OB from the Z direction to the Y direction. Further, an emission part 51c is arranged in the Y direction of the reflection film 511, and the emission part 51c (the second lens LS2 formed thereon) converges the light reflected by the reflection film 511 toward the Y direction. . Thus, in the configuration in which the light traveling in the Z direction from the document OB to the reflection film 511 is converged in the Y direction by the emission unit 51c, a space (first accommodation space SP1) is created on the document OB side of the emission unit 51c. Can do. Therefore, in this embodiment, a light guide 31 (light guide member) that guides light from the light source 32 to the document OB (irradiation position LP for irradiating light) is disposed in this space. Therefore, although the light guide 31 is provided in addition to the light source 32, the image reading apparatus 1 can be reduced in size.

  In this way, the light guide 31 is arranged in a space that is vacant on the document OB side of the emission portion 51c of the lens array 5, that is, the emission portion 51c and the light guide 31 of the lens array 5 are arranged side by side in the Z direction. ing. Furthermore, in this embodiment, the image reading apparatus 1 is reduced in size by taking advantage of such an arrangement as follows. That is, the lens array 5 forms an erecting equal-magnification image toward the optical sensor 7, and the light guide 31 guides the light emitted from the light source 32. Therefore, it is necessary to arrange the optical sensor 7 and the light source 32 for each of the lens array 5 and the light guide 31. On the other hand, in the configuration in which the lens array 5 and the light guide 31 are arranged side by side in the Z direction, both the optical sensor 7 and the light source 32 can be arranged together in the Y direction of the lens array 5 and the light guide 31. it can. Therefore, in this embodiment, the optical sensor 7 and the light guide 31 are arranged in the Y direction of the lens array 5 and the light guide 31. In addition, the printed circuit board 8 is arranged in the Y direction of the lens array 5 and the light guide 31, and the optical sensor 7 and the light source 32 are mounted on the same printed circuit board 8. As a result, the image reading apparatus 1 can be reduced in size.

  As described above, in the above embodiment, the Z direction corresponds to the “first direction” of the present invention, and the Y direction corresponds to the “second direction” of the present invention. The image reading device 1 corresponds to the “image reading device” of the present invention, the light source 32 corresponds to the “light source” of the present invention, the light guide 31 corresponds to the “light guide member” of the present invention, and the first An imaging optical system composed of the lens LS1, the reflective film 511, and the second lens LS2 corresponds to the “imaging optical system” of the present invention, the optical sensor 7 corresponds to the “optical sensor” of the present invention, and the printed circuit board 8 Corresponds to the “substrate” of the present invention. Further, the incident portion 51a corresponds to the “incident portion” of the present invention, the curved portion 51b corresponds to the “connecting portion” of the present invention, the emission portion 51c corresponds to the “emergence portion” of the present invention, and the reflective film 511. Corresponds to the “reflection surface” of the present invention. The first lens LS1 corresponds to the “incident lens” of the present invention, and the second lens LS2 corresponds to the “exit lens” of the present invention.

  The present invention is not limited to the above-described embodiment, and various modifications can be made to the above-described one without departing from the spirit of the present invention. For example, in the above embodiment, the light guide portion 51 has a shape that is bent at a right angle from the Z direction toward the Y direction in the bending portion 51b (that is, the Y direction is the “second direction” of the present invention). Corresponded). However, the angle at which the light guide 51 is curved is not limited to 90 °, and may be configured, for example, as shown in FIG. FIG. 4 is a diagram illustrating a modification of the imaging optical system. Since the modification shown in FIG. 4 differs only in the configuration of the imaging optical system, this difference will be described here, and common portions will be denoted by corresponding reference numerals, and description thereof will be omitted as appropriate. Needless to say, the modification of FIG. 4 achieves the same effect by the configuration common to the above-described embodiment.

  In the lens array 5 of FIG. 4, the curved portion 51b of the light guide 51 is curved in the W direction (second direction) intersecting the Z direction at an angle θw (<90 °) smaller than 90 °. Subsequent injection part 51c has a shape extending in the W direction. That is, the light guide 51 is curved from the X direction to the W direction at the curved portion 51b from the incident portion 51a to the emission portion 51c. On the upper surface of the incident part 51a of the light guide part 51, a plurality of first lenses convex upward are arranged in a line at a predetermined pitch in the X direction. In addition, a plurality of second lenses convex in the W direction are arranged in a line at a predetermined pitch in the X direction on the end surface in the W direction of the emission part 51c of the light guide unit 51. Further, the outer peripheral surface of the curved portion 51b is finished in a shape that satisfies the total reflection condition.

  Since the lens array 5 has such a configuration, the light incident from the first lens LS1 is totally reflected in the W direction on the outer peripheral surface of the curved portion 51b and guided to the second lens LS2. The second lens LS2 converges the totally reflected light at the curved portion 51b in the W direction. Thus, an erecting equal-magnification image of the original OB is formed in the W direction of the second lens LS2. This erecting equal-magnification image is read by the optical sensor 7 arranged in the W direction of the second lens LS2.

  On the other hand, a light guide 31 is disposed above the lens array 5, and a light source 32 is disposed in the W direction of the light guide 31. And the light inject | emitted from the light source 32 is guide | induced by the light guide 31, and is irradiated to the irradiation position LP. As described above, in the modification of FIG. 4, the light traveling in the Z direction from the document OB to the outer peripheral surface (reflection surface) of the curved portion 51b is converged in the W direction by the emitting portion 51c. A space is created on the side of the original OB of the injection unit 51c. A light guide 31 (light guide member) that guides light from the light source 32 to the original OB (irradiation position LP for irradiating light to the original OB) is disposed in this space. As a result, it is possible to reduce the size of the image reading apparatus 1 despite having the light guide 31 in addition to the light source 32.

  Further, in the modification shown in FIG. 4, both the optical sensor 7 and the light source 32 are collectively arranged in the W direction of the lens array 5 and the light guide 31, and the optical sensor 7 and the light source 32 are connected to the lens array 5 and the light guide. The guide 31 is mounted on the same printed circuit board 8 arranged in the W direction. This also makes it possible to reduce the size of the image reading apparatus 1.

  In the embodiment described above, the surface of the reflective film 511 has a curved shape. However, for example, the reflective film 511 may be formed in a flat shape by forming the reflective film 511 on the outer peripheral surface of the curved portion 51b of the light guide 51 in a flat shape.

  In addition, as a method for forming the reflective film 511, a method other than the metal vapor deposition described above can be appropriately employed.

  Further, various shapes such as an aspherical shape and a free-form surface shape can be adopted as the shape of the first and second lenses LS1 and LS2.

  In the embodiment described above, the first lens LS1, the reflective film 511, and the second lens LS2 are integrally formed of a transparent medium, and are used as the imaging optical system. However, the imaging optical system can be modified to that shown in FIG. Here, FIG. 5 is a schematic diagram showing another modification of the imaging optical system. Since the modification shown in FIG. 5 differs only in the configuration of the imaging optical system, this difference will be described here, and common portions will be denoted by corresponding reference numerals and description thereof will be omitted as appropriate. Further, it goes without saying that the modification of FIG. 5 has the same effect due to the configuration common to the above-described embodiment.

  In the modification shown in FIG. 5, the emission part 51c (injection part) is constituted by four lenses LS arranged in the Y direction. In addition, a reflection mirror 512 configured separately from the emission unit 51c is disposed in the Z direction of the document OB. The light traveling from the original OB in the Z direction is directly incident on the reflection mirror 512 and is reflected by the reflection mirror 512 in the Y direction. Then, the four lenses LS constituting the emission part 51c cooperate to converge the light reflected by the reflection mirror 512 in the Y direction. Thus, an erecting equal-magnification image is formed on the optical sensor 7. Note that a refractive index distribution type lens may be used instead of the four lenses LS shown in FIG. 5, and the same function may be realized.

  DESCRIPTION OF SYMBOLS 1 ... CIS module (image reading apparatus), 2 ... Frame 2, 3 ... Illumination part, 31 ... Light guide (light guide member), 32 ... Light source, 5 ... Lens array, 51 ... Light guide part, 51a ... Incident part, 51b: curved portion (connecting portion), 51c: emitting portion, 7: optical sensor, 8 ... printed circuit board, LS1: first lens (incident lens), LS2: second lens (exiting lens), Z: Z direction ( (First direction), Y ... Y direction (second direction), W ... W direction (second direction)

Claims (2)

A light source;
A light guide member that guides light emitted from the light source from one end and irradiates the original placed on the original glass from the tip at the other end; and
Light traveling in the first direction from the original is received by the incident portion, reflected by the reflecting surface disposed in the first direction of the incident portion in the second direction intersecting the first direction, and reflected by the reflecting surface. The reflected light is converged in the second direction by the emitting portion disposed in the second direction of the reflecting surface, and an erecting equal-magnification image of the original is formed in the second direction of the emitting portion. An imaging optical system;
An optical sensor disposed in the second direction of the exit portion of the imaging optical system for detecting the erecting equal-magnification image formed by the imaging optical system, the original glass, and the imaging optical system An incident-side aperture that is provided between the incident portion and functions as an aperture for the incident portion;
An exit-side aperture that is provided between the exit portion of the imaging optical system and the optical sensor and functions as an aperture for the optical sensor;
A frame having a first accommodation space in which the light source and the light guide member are accommodated, and a second accommodation space in which the incident side aperture, the imaging optical system, the emission side aperture, and the optical sensor are accommodated. When,
A separator provided on the frame and configured to block light directed directly from the first accommodation space to the second accommodation space;
With
The light guide member is disposed on the document side of the separator so as to overlap with a part of the injection portion in the first direction,
The tip portion of the light guide member is supported by a support portion that is provided on the separator and has an inclined plane that is inclined with respect to the first direction so as to follow the outer shape of the tip portion,
The light source is disposed in the second direction of the one end of the light guide member;
The optical sensor and the light source are mounted on the same substrate disposed in the second direction of the imaging optical system and the light guide member,
The incident side aperture and the exit side aperture are arranged in a state of being separated from the imaging optical system,
In the imaging optical system, the incident portion extending in the first direction, the emission portion extending in the second direction, and a connection portion that continuously connects the incidence portion and the emission portion are integrated with a transparent medium. And a curved portion that is curved so that the direction along the first direction gradually changes from the direction along the first direction to the direction along the second direction at the connection portion from the incident portion toward the emission portion. Has a shape,
The image reading apparatus, wherein the reflection surface is formed of a reflection film provided on the curved outer peripheral surface of the connection portion. The incident portion has an incident lens on a surface facing the incident-side aperture, and guides light from the original toward the first direction to the reflection surface by the incident lens.
The said exit part has an exit lens in the surface facing the said exit side aperture, The light reflected by the said reflective surface by the said exit lens is converged toward the said 2nd direction. Image reading device.

Images