WO2019188991A1

WO2019188991A1 - Image reading device and assembling method for image reading device

Info

Publication number: WO2019188991A1
Application number: PCT/JP2019/012524
Authority: WO
Inventors: 祐樹奥東; 大輔大濱; 正明岡田; 雅彦高品
Original assignee: 三菱電機株式会社
Priority date: 2018-03-29
Filing date: 2019-03-25
Publication date: 2019-10-03

Abstract

The image reading device (1A) is provided with: a case (10) having a first opening (11) formed on a first-surface side and extending in a main scanning direction, a second opening (13) formed on a second-surface side located on the opposite side from the first surface and extending in the main scanning direction, and a lens body (60) disposed between the first opening (11) and the second opening (13); a cover glass (20) disposed on the first-surface side of the case (10) and covering the first opening (11); a light-receiving sensor (31) positioned closer to the second-surface side than the lens body (60) and receiving light passing through the cover glass (20) and focused by the lens body (60); and a sensor substrate (30) disposed on the second-surface side of the case (10) and supporting the light-receiving sensor (31). The cover glass (20) or the sensor substrate (30) is larger than the case (10) in a sub-scanning direction, protrudes beyond both ends of the case (10) in the sub-scanning direction, and is bonded to the case (10).

Description

Image reading apparatus and image reading apparatus assembling method

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

The image reading apparatus is fitted with a transparent plate that defines a reading surface, a sensor substrate on which a light-receiving sensor that receives light that has been reflected by a reading object and transmitted through the transparent plate is mounted, and the transparent plate and the sensor substrate. And a housing provided with a wall portion.

For example, Patent Document 1 discloses an image reading apparatus in which a transparent plate and a sensor substrate are fitted to an inner wall of a concave storage portion formed in a housing.

Patent Document 2 discloses an image reading apparatus in which a rectangular transparent plate is fitted to a rectangular frame-shaped wall portion formed in a casing. A contact surface surrounded by the wall is formed on the housing, and a transparent plate is in contact with the contact surface. Thereby, the plate | board surface of a transparent plate is positioned by the contact surface.

Japanese Patent Laid-Open No. 10-190909 JP 2010-124189 A

In the image reading apparatus described in Patent Document 1, a transparent plate and a sensor substrate are fitted to the inner wall of the housing. For this reason, when the inner wall of the housing is distorted, the transparent plate and the sensor substrate are bent by being pushed by the inner wall. In this case, the resolution of the image reading apparatus is lowered.

In the image reading apparatus described in Patent Document 2, when the area of the transparent plate is larger than the contact surface of the housing, the transparent plate may bend. In this case as well, the resolution of the image reading apparatus is lowered as in the image reading apparatus described in Patent Document 1.

SUMMARY An advantage of some aspects of the invention is that it provides an image reading apparatus and a method for assembling the image reading apparatus in which a transparent plate or a sensor substrate is prevented from being bent and a resolution is prevented from being lowered. And

In order to achieve the above object, an image reading apparatus according to the present invention includes a first opening extending in the main scanning direction on the first surface side and a main scanning on the second surface side opposite to the first surface. A second opening extending in the direction is formed, the housing having a lens body disposed between the first opening and the second opening, and provided on the first surface side of the housing to cover the first opening A transparent plate, a light receiving sensor located on the second surface side of the lens body, transmitting the transparent plate and receiving the light focused by the lens body, and provided on the second surface side of the housing; A sensor substrate that supports the light receiving sensor. The transparent plate or the sensor substrate is larger than the casing in the sub scanning direction, protrudes on both sides of the casing in the sub scanning direction, and is bonded to the casing.

According to the configuration of the present invention, since the transparent plate or the sensor substrate is larger than the housing in the sub-scanning direction, the transparent plate or the sensor substrate is protruded on both sides of the housing in the sub-scanning direction. The end portions on both sides in the sub-scanning direction of the substrate can be gripped and bonded to the housing. Since the end portions on both sides of the transparent plate or the sensor substrate in the sub-scanning direction are gripped, the transparent plate or the sensor substrate is not easily bent in the sub-scanning direction. For this reason, a transparent plate or a sensor board | substrate can be adhere | attached on a housing | casing in the state which prevented the bending of the transparent board or the sensor board | substrate. As a result, a reduction in resolution can be prevented.

1 is a perspective view of an image reading apparatus according to Embodiment 1 of the present invention. Sectional view of II-II section line shown in FIG. Sectional view of III-III section line shown in FIG. FIG. 3 is a component configuration diagram of the image reading apparatus according to the first embodiment. 1 is a perspective view of a housing provided in an image reading apparatus according to Embodiment 1. FIG. Sectional view of VI-VI section line shown in FIG. Sectional view of VII-VII section line shown in FIG. 1 is a perspective view of a light source unit provided in an image reading apparatus according to Embodiment 1. FIG. Sectional drawing of a lens holder when a lens body is inserted in the assembly method of the image reading apparatus which concerns on Embodiment 1 of this invention. The perspective view of a housing | casing when inserting a light guide and a light guide holder in the assembly method of the image reading apparatus which concerns on Embodiment 1 of this invention. The perspective view of a housing | casing when a light guide and a light guide holder are inserted in the assembly method of the image reading apparatus which concerns on Embodiment 1 of this invention. Sectional view of XII-XII section line shown in FIG. Sectional view of XIII-XIII section line shown in FIG. Sectional drawing of a housing | casing when a cover glass is attached in the assembly method of the image reader which concerns on Embodiment 1 of this invention. Sectional drawing of a housing | casing when a cover glass and a sensor board | substrate are attached in the assembly method of the image reader which concerns on Embodiment 1 of this invention. FIG. 7 is a perspective view of a light guide, a light guide holder, and a housing included in an image reading apparatus according to Embodiment 2 of the present invention. The perspective view of the housing | casing with which the image reader which concerns on Embodiment 2 of this invention is equipped, and the light guide and the light guide holder were inserted. Sectional view of XVIII-XVIII section line shown in FIG. Sectional view of XIX-XIX section line shown in FIG.

Hereinafter, an image reading apparatus and an assembly method of the image reading apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent part in a figure. The main scanning direction of the image reading apparatus is the X-axis direction, the sub-scanning direction is the Y-axis direction, and the direction orthogonal to the X-axis and the Y-axis is the Z-axis direction. Hereinafter, this coordinate system will be described as appropriate.

(Embodiment 1)
The image reading apparatus according to Embodiment 1 is an image reading apparatus in which a transparent plate and a sensor substrate are attached to a housing. The image reading apparatus includes a transparent plate and a sensor substrate provided with gripping areas for gripping at both ends at assembly. The transparent plate and the sensor substrate are bonded to the casing in a state where the gripping area is fixed and pressed against the casing in order to prevent warping or bending. First, the configuration of the image reading apparatus will be described with reference to FIGS. Next, a method for assembling the image reading apparatus will be described with reference to FIGS.

FIG. 1 is a perspective view of an image reading apparatus 1A according to Embodiment 1 of the present invention. 2 is a cross-sectional view taken along the line II-II shown in FIG. 3 is a cross-sectional view taken along the line III-III shown in FIG. FIG. 4 is a component configuration diagram of the image reading apparatus 1A according to the first embodiment. FIG. 5 is a perspective view of the housing 10 provided in the image reading apparatus 1A according to the first embodiment. 6 is a cross-sectional view taken along the line VI-VI shown in FIG. 7 is a cross-sectional view taken along the line VII-VII shown in FIG. FIG. 8 is a perspective view of the light source unit 40 provided in the image reading apparatus 1A according to the first embodiment. 5 to 7 illustrate the lens body in addition to the housing. In this specification, a housing in which a lens body is incorporated is also referred to as a lens unit. 5 to 7 illustrate this lens unit.

The image reading apparatus 1A has a reading object arranged on the + Z side and reads an image of the reading object. As shown in FIG. 1, the image reading apparatus 1 A includes a housing 10 that contains optical components, and a cover glass that covers the + Z surface side of the housing 10 and makes light reflected by a reading object enter the housing 10. 20 and a sensor substrate 30 that is disposed on the −Z surface side of the housing 10 and reads an image of a reading object from light incident on the housing 10.

The housing 10 is formed in a box shape having an opening on the + Z side, as shown in FIGS. 4 and 5, in order to allow the reflected light of the reading object to enter. Specifically, the housing 10 is formed in the shape of a rectangular parallelepiped box whose longitudinal direction is in the X direction, that is, the main scanning direction. And the housing | casing 10 has the 1st opening 11 extended in the main scanning direction formed by opening + Z surface. In the present specification, the + Z surface of the housing 10 in which the first opening 11 is formed is also referred to as a first surface.

A support frame portion 12 extending in the + Y direction and the −Y direction from the + Z end of the + Y wall and the −Y wall of the housing 10 is arranged at the peripheral edge of the first opening 11 in the sub-scanning direction, that is, the + Y and −Y directions. Is provided. As shown in FIGS. 2 and 3, the support frame portion 12 is provided with a first adhesive portion 70. Here, the first adhesive portion 70 is formed by applying a moisture-curing adhesive to the support frame portion 12 and further curing it. The first bonding portion 70 bonds the cover glass 20 to the support frame portion 12.

The housing 10 has a second opening 13 formed on the −Z side as shown in FIG. Specifically, a bottom plate portion 14 parallel to the XY plane is provided on the −Z side of the housing 10. A second opening 13 having a width smaller than the width in the Y direction of the bottom plate portion 14 is formed in the bottom plate portion 14. Although not shown, the second opening 13 extends in the X direction. A light receiving sensor 31 (described later) of the sensor substrate 30 is disposed in the second opening 13. The center of the second opening 13 in the Y direction is the same as the center C of the first opening 11 in the Y direction so that the light receiving sensor 31 receives light incident from the first opening 11. The center C is at the same position in the Y direction as the center of the bottom plate portion 14 in the Y direction. In the present specification, the −Z surface of the housing 10 in which the second opening 13 is formed is also referred to as a second surface.

The optical component is accommodated in the casing 10 formed in the shape described above. Specifically, the housing 10 has a light source unit 40 and a light guide unit that guides light emitted from the light source unit 40 and emits the guided light toward the cover glass 20 as shown in FIGS. The

bodies

50R and 50L and the lens body 60 that focuses the reflected light emitted from the cover glass 20 and reflected by the reading object are accommodated.

Two light source units 40 are provided as shown in FIG. As shown in FIG. 8, each of the light source units 40 is mounted with two light source elements 41 composed of a plurality of light emitting diodes emitting red, blue, and green light, and two light source elements 41. A light source substrate 42 that supplies power from the outside to the element 41 and dissipates heat from the two light source elements 41 is provided. The two light source units 40 are disposed on the + X side and the −X side in the housing 10 as shown in FIG. Light guides 50R and 50L are arranged between the two light source units 40.

The light guides 50R and 50L are formed in a bar shape extending in the X direction. Although not shown, the light emitting sections of the two light source elements 41 included in each of the light source units 40 face the + X end surface and the −X end surface of the light guides 50R and 50L.

As shown in FIG. 2, the light guides 50 R and 50 L are sandwiched between a lens holder 61 and a light guide holder 51 that are fitted in the housing 10. Specifically, as shown in FIG. 4, the lens holder 61 and the light guide holder 51 are respectively arranged on the + X side and the −X side in the housing 10. As shown in FIG. 2, the lens holder 61 is formed in a YZ sectional view trapezoidal shape whose width narrows in the Z direction. The lens holder 61 is fitted into the second opening 13 with the wide surface facing the -Z side. The lens holder 61 has light guide direction determining surfaces 610 R and 610 L that are inclined in the Y direction when fitted in the second opening 13. Here, the light guide

direction determining surfaces

610R and 610L are inclined symmetrically with respect to the Z axis in the YZ section. In the light guides 50R and 50L, the + Y plane and the −Y plane are brought into contact with the light guide

direction determining surfaces

610R and 610L, so that the inclination directions of the + Y plane and the −Y plane are determined.

On the other hand, as shown in FIG. 4, the light guide holder 51 includes a rectangular cover portion 52, and

wall portions

53R and 53L extending in the −Z direction from the −Y end and the + Y end of the rectangular cover portion 52. And having. As shown in FIG. 2, the light guide holder 51 is fitted into the first opening 11 with the

walls

53R and 53L facing the −Z side. The inner wall surfaces of the

wall portions

53R and 53L are in contact with the −Y surface of the light guide 50R and the + Y surface of the light guide 50L whose inclination direction is determined. The outer wall surfaces of the

wall portions

53R and 53L are bonded to the housing 10 with an adhesive 71. Thus, the light guides 50R and 50L are sandwiched between the light guide holder 51 and the lens holder 61.

The + Z ends of the light guides 50R and 50L have

planes

510R and 510L that are parallel to the plate surface of the bottom plate portion 14 in a state where the inclination directions of the + Y plane and the −Y plane are determined. As shown in FIG. 3, the light guides 50 R and 50 L are positioned at a height where the flat surfaces 510 R and 510 L are separated from the bottom plate part 14 by a certain distance. It is fixed to. Here, the third adhesive portion 72 is formed by curing an ultraviolet curable adhesive applied to the central portion in the X direction of the housing 10. The light guides 50R and 50L are bonded to only the central portion in the X direction of the housing 10 so that distortion is not easily generated. On the other hand, the lens body 60 is disposed between the light guides 50R and 50L. In the present specification, the

planes

510R and 510L are also referred to as first planes.

The lens body 60 is formed in a rectangular parallelepiped shape as shown in FIG. Although not shown, the lens body 60 includes a lens array in which lenses such as rods and microlenses are arranged in the longitudinal direction. The incident surface of the lens array of the lens body 60 is oriented in the + Z direction. Further, the longitudinal direction of the lens body 60 is directed in the X direction in order to focus the light on the sensor substrate 30 extending in the main scanning direction. The lens body 60 is held by a lens holder 61 as shown in FIG.

The lens holder 61 is fitted in the second opening 13 formed in the housing 10. The lens holder 61 is formed to have the same width as the width of the second opening 13 in the Y direction as viewed in the YZ cross section, and is a flat plate portion 620 parallel to the XY plane, and the −Y end side and the + Y end of the stand portion 620.

Support portions

630R and 630L extending obliquely from the side toward the center C in the Y direction of the first opening 11. Between the + Z ends of the

support portions

630R and 630L, a lens insertion hole 640 into which the lens body 60 can be loosely inserted is opened.

The width of the lens insertion hole 640 in the Y direction is larger than the width of the lens body 60 in the Y direction so that the lens body 60 can be loosely inserted. The lens body 60 is loosely inserted into the lens insertion hole 640. The center of the lens body 60 in the Y direction is aligned with the center C of the first opening 11 in the Y direction. The lens body 60 is bonded to the inner wall of the lens insertion hole 640 and the + Z ends of the

support portions

630R and 630L with an adhesive 73 containing a light shielding material. Thereby, the lens body 60 is held by the lens holder 61. In the present specification, the adhesive 73 is also referred to as a light shielding body because it includes a light shielding material.

Further, the lens body 60 is held not only by the lens holder 61 but also by the housing 10 as shown in FIG. Specifically, the housing 10 has

inner walls

15R and 15L extending obliquely from the second opening 13 toward the center C in the Y direction at the center in the X direction. A lens insertion slit 16 into which the lens body 60 can be loosely inserted is formed between the + Z ends of the

inner walls

15R and 15L. The width of the lens insertion slit 16 in the Y direction is the same as the width of the lens insertion hole 640 in the Y direction so that the lens body 60 can be loosely inserted. The lens body 60 is loosely inserted into the lens insertion slit 16. The lens body 60 is bonded to the

inner walls

15R and 15L with an adhesive 73 containing a light shielding material in a state where the center in the Y direction is aligned with the center C in the Y direction of the first opening 11. Thereby, the lens body 60 is held by the housing 10 as described above. As shown in FIGS. 2 and 3, the sensor substrate 30 is disposed on the −Z side of the lens body 60.

The sensor substrate 30 is formed in the shape of a rectangular plate whose longitudinal direction is directed in the X direction, as shown in FIG. The sensor substrate 30 is provided with a light receiving sensor 31 arranged in the X direction at the center in the Y direction.

As shown in FIGS. 2 and 3, the width W1 of the sensor substrate 30 in the short direction, that is, the Y direction is larger than the width W2 of the bottom plate portion 14 of the housing 10 in the Y direction. The light receiving sensor 31 is disposed at a position in the Y direction that coincides with the center C in the Y direction of the first opening 11. In other words, the position of the light receiving sensor 31 in the Y direction coincides with the center of the bottom plate portion 14 in the Y direction. The + Y end and the −Y end of the sensor substrate 30 protrude from the bottom plate portion 14 to the + Y side and the −Y side. The regions protruding from the bottom plate portion 14 at the + Y end and the −Y end of the sensor substrate 30 are gripping

regions

32 and 33 for gripping the sensor substrate 30 when the sensor substrate 30 is fixed to the bottom plate portion 14. Is provided. When the sensor substrate 30 is fixed to the bottom plate portion 14, the + Y end and the −Y end are gripped, and the warp or the deflection is corrected. The sensor substrate 30 is disposed on the −Z surface side of the bottom plate portion 14 in a state in which the warp or the deflection is corrected, and is fixed to the bottom plate portion 14 by the second adhesive portion 74. Here, the second adhesive portion 74 is formed by curing a moisture curing type adhesive applied to the bottom plate portion 14.

Returning to FIG. 4, the cover glass 20 is formed in the shape of a rectangular plate whose longitudinal direction is directed in the X direction. 2 and 3, the width W3 in the short direction of the cover glass 20, that is, the Y direction is larger than the width W4 in the Y direction of the support frame portion 12 included in the housing 10. The center of the cover glass 20 in the Y direction coincides with the center C of the first opening 11 in the Y direction. Further, the + Y end and the −Y end of the cover glass 20 protrude from the support frame portion 12 to the + Y side and the −Y side. When the cover glass 20 is also fixed to the support frame portion 12, the + Y end and the −Y end are gripped, and the warp or the deflection is corrected. And the cover glass 20 is arrange | positioned at the + Z surface side of the support frame part 12 in the state by which curvature or bending was corrected, and is being fixed by the 1st adhesion part 70 mentioned above. The areas protruding from the support frame portion 12 at the + Y end and the −Y end of the cover glass 20 are provided as

gripping areas

27 and 28 for gripping the cover glass 20. Next, a method for assembling the image reading apparatus 1A using the

grip areas

27 and 28 of the cover glass 20 and the

grip areas

32 and 33 of the sensor substrate 30 will be described with reference to FIGS.

FIG. 9 is a cross-sectional view of the lens holder 61 into which the lens body 60 is inserted. FIG. 10 is a perspective view of the housing 10 when the light guides 50R and 50L and the light guide holder 51 are inserted. FIG. 11 is a perspective view of the housing 10 when the light guides 50R and 50L and the light guide holder 51 are inserted. 12 is a cross-sectional view taken along the line XII-XII shown in FIG. 13 is a cross-sectional view taken along the line XIII-XIII shown in FIG. FIG. 14 is a cross-sectional view of the housing 10 when the cover glass 20 is attached. FIG. 15 is a cross-sectional view of the housing 10 when the cover glass 20 and the sensor substrate 30 are attached.

First, the casing 10 having the shape and size described above, the cover glass 20, the sensor substrate 30, the light source unit 40, the light guides 50R and 50L, the light guide holder 51, the lens body 60, and the lens holder 61 are prepared. In order to correct warpage or deflection, which will be described later, the cover glass 20 and the sensor substrate 30 may be selected by experiments so that they have flexibility and are not destroyed by the correction of warpage or deflection.

Next, the two prepared light source units 40 are inserted into the housing 10 through the first opening 11 and are fitted into the + X side and the −X side of the housing 10. And it adhere | attaches on the housing | casing 10 with the adhesive material containing a material with high heat conductivity.

After the light source unit 40 is fitted into the housing 10, the lens holders 61 are fitted into the + X side and the −X side of the second opening 13 of the housing 10. At this time, the −Z surface of the lens holder 61 and the −Z surface of the bottom plate portion 14 of the housing 10 are made parallel to align the positions in the Z direction.

Next, the lens body 60 is attached to the fitted lens holder 61. Specifically, as shown in FIG. 9, the lens body 60 is inserted into the lens insertion hole 640 of the lens holder 61. Then, the position of the lens body 60 is adjusted using a jig or an assembly device while measuring the distance D1 from the −Z plane of the lens holder 61 to the + Z plane of the lens body 60 using a camera, a laser displacement meter, or the like. . Thereby, the distance D1 is set to a desired distance. A distance D2 from the center C in the Y direction of the first opening 11 to the + Y plane of the lens body 60 is set to a desired distance. At this time, the −Z plane of the lens holder 61 and the + Z plane of the lens body 60 are made parallel. After adjusting the position of the lens body 60, the adhesive 73 is applied to the lens insertion hole 640 while maintaining the position. Thereby, the adhesive 73 is filled in the gap in the Y direction between the lens holder 61 and the lens body 60. Subsequently, the filled adhesive 73 is cured to fix the lens body 60 to the lens holder 61. As described above, the adhesive 73 includes a light shielding material. For this reason, the light shielding part is formed between the lens holder 61 and the lens body 60 by the adhesive 73.

Subsequently, although not shown, an adhesive 73 is applied to the lens insertion slit 16 of the housing 10, and the adhesive 73 is filled in the Y-direction gap between the + Z ends of the inner walls 15 R and 15 L and the lens body 60. The adhesive 73 is applied in the main scanning direction along the lens insertion slit 16. Thereby, the gap extending in the main scanning direction is closed with the adhesive 73. Further, the filled adhesive 73 is cured. As a result, the lens body 60 is fixed to the + Z ends of the

inner walls

15R and 15L.

Next, as shown in FIG. 10, the light guides 50R and 50L are inserted into the lens holder 61 to which the lens body 60 is fixed. Then, the positions of the inserted light guides 50R and 50L are adjusted. Specifically, the inserted light guides 50R and 50L are brought into contact with the light guide

direction determining surfaces

610R and 610L of the lens holder 61 shown in FIG. Thereby, the inclination directions of the + Y plane of the light guide 50R and the −Y plane of the light guide 50L are determined. Further, the positions of the light guides 50R and 50L are finely adjusted while measuring using a camera, a laser displacement meter, or the like. Thereby, the heights of the

planes

510R and 510L are made uniform. Further, the + Z side of the light guides 50R and 50L is imaged by the camera, and the image is formed between the

planes

510R and 510L and the inclined surfaces adjacent to the

planes

510R and 510L based on the images. The position coordinates of the

edge portions

520R and 520L shown in FIG. Subsequently, the positions of the light guides 50R and 50L are finely adjusted based on the obtained position coordinates of the

edge portions

520R and 520L. Accordingly, the

edge portions

520R and 520L are directed in the main scanning direction. The position of the light guides 50R and 50L is determined by the above position adjustment.

Subsequently, as shown in FIG. 13, the light guides 50 R and 50 L whose positions have been adjusted are fixed to the housing 10. Specifically, an ultraviolet curable adhesive is applied to the gap between the -Y inner wall of the first opening 11 and the light guide 50R, and the + Y inner wall of the first opening 11 and the light guide 50L, and the adhesive is cured. Thereby, the 3rd adhesion part 72 is formed. Thereby, the light guides 50R and 50L are fixed to the housing 10 in a state where the position is adjusted. At this time, the third adhesive portion 72 is not formed on the + X end side and the −X end side of the housing 10 shown in FIG. 12 in order to prevent the light guides 50R and 50L from being distorted. It forms in only the X direction center part of the housing | casing 10 shown in FIG. In the present specification, the step of forming the third adhesive portion 72 is referred to as a third adhesive portion forming step. The inclined surface adjacent to the

flat surfaces

510R and 510L is also referred to as a second flat surface.

Next, as shown in FIG. 14, the cover glass 20 is fixed to the + Z side of the housing 10. Specifically, first, an adhesive is applied to the + Z side of the support frame portion 12 included in the housing 10. Here, a moisture curable adhesive is used as the adhesive. Further, the adhesive is applied along the X direction, that is, the main scanning direction. Subsequently, the gripping

areas

27 and 28 at the + Y end and the −Y end of the cover glass 20 are gripped, the cover glass 20 is pressed against the support frame portion 12, and the cover glass 20 is moved along the support frame portion 12. Thereby, the curvature or deflection of the cover glass 20 is corrected. At this time, the center of the cover glass 20 in the Y direction is aligned with the center C of the first opening 11 in the Y direction, and the cover glass 20 is supported with the longitudinal direction of the cover glass 20 facing the main scanning direction, that is, the X direction. Press against the frame 12. Further, the adhesive is cured while the cover glass 20 is pressed against the support frame portion 12 to form the first adhesive portion 70. Thereby, the cover glass 20 is fixed to the support frame portion 12 while the warp or the deflection is corrected. In the present specification, the step of forming the first bonding portion 70 is referred to as a first bonding portion forming step, and the step of bonding and fixing the cover glass 20 to the support frame portion 12 is referred to as a cover glass bonding step.

Next, as shown in FIG. 15, the sensor substrate 30 is fixed to the −Z side of the housing 10. Specifically, first, an adhesive is applied to the + Y side region and the −Y side region of the bottom plate portion 14 of the housing 10. Also in this step, a moisture curable adhesive is used as the adhesive. In addition, the adhesive is applied along the main scanning direction in the same manner as the formation of the first adhesive portion 70. Subsequently, with the surface of the sensor substrate 30 with the light receiving sensor 31 facing the + Z side, the gripping

areas

32 and 33 at the + Y end and the −Y end of the sensor substrate 30 are gripped to Press against the bottom plate part 14. Then, the sensor substrate 30 is placed along the bottom plate portion 14. Thereby, the warp and the deflection of the sensor substrate 30 are corrected. The sensor substrate 30 is pressed against the bottom plate portion 14 in a state where the center of the light receiving sensor 31 in the Y direction is aligned with the center C of the first opening 11 in the Y direction. The direction in which the light receiving sensors 31 are arranged is set in the main scanning direction, that is, the X direction. Then, the second adhesive portion 74 is formed by curing the adhesive while the sensor substrate 30 is pressed against the bottom plate portion 14. Accordingly, the sensor substrate 30 is fixed to the bottom plate portion 14 in a state where the warp or the deflection is corrected. The image reading apparatus 1A is assembled by the above steps. In the present specification, the step of forming the second bonding portion 74 is referred to as a second bonding portion forming step, and the step of bonding and fixing the sensor substrate 30 to the bottom plate portion 14 is referred to as a sensor substrate bonding step.

As described above, in the image reading apparatus 1A according to Embodiment 1 of the present invention, the length of the cover glass 20 in the main scanning direction is smaller than the width in the sub scanning direction. For this reason, the cover glass 20 is not easily bent in the sub-scanning direction. Further, since the cover glass 20 is bonded to the housing 10 with the gripping

areas

27 and 28 in the sub-scanning direction having a small width being gripped, it is difficult to bend at the time of bonding. Also difficult to warp.

The image reading apparatus 1 A is manufactured by adhering the cover glass 20 to the support frame portion 12 while keeping the cover glass 20 along the support frame portion 12 of the housing 10 and holding the gripping

areas

27 and 28. Is done. Thereby, the curvature or deflection of the cover glass 20 is corrected. As a result, it is possible to prevent a decrease in the resolution of the image reading apparatus 1A.

The length of the sensor substrate 30 in the main scanning direction is also smaller than the width in the sub scanning direction. For this reason, the sensor substrate 30 is also difficult to bend in the sub-scanning direction. The sensor substrate 30 is bonded to the housing 10 with the gripping

areas

32 and 33 in the sub-scanning direction having a small width being gripped. Also difficult to warp.

The image reading apparatus 1A is manufactured by adhering the cover glass 20 to the support frame portion 12 in a state where the sensor substrate 30 is aligned with the bottom plate portion 14 of the housing 10 and the holding

regions

32 and 33 are held. The Thereby, the warp or the deflection of the sensor substrate 30 is corrected. As a result, it is possible to prevent a decrease in the resolution of the image reading apparatus 1A.

In the image reading apparatus 1A, the heights of the

flat surfaces

510R and 510L included in the light guides 50R and 50L are aligned. Further, the directions of the

edge portions

520R and 520L included in the light guides 50R and 50L are oriented in the main scanning direction. For this reason, the light guides 50 R and 50 L can emit light uniformly toward the cover glass 20.

The position of the lens body 60 is adjusted with reference to the −Z surface of the lens holder 61 and the center C in the Y direction of the first opening 11. For this reason, the light can be focused at an accurate position. Further, since the −Z surface of the lens holder 61 and the −Z surface of the bottom plate portion 14 of the housing 10 are aligned, the sensor substrate 30 is in contact with the −Z surface of the bottom plate portion 14. The light focused by the body 60 can be received with high accuracy.

(Embodiment 2)
In the image reading apparatus 1B according to Embodiment 2,

planes

530R and 530L are formed on the Y side of the lens body 60. The image reading apparatus 1B according to the second embodiment will be described below with reference to FIGS. In the second embodiment, a configuration different from that of the first embodiment will be described.

FIG. 16 is a perspective view of the light guides 50R and 50L, the light guide holder 51, and the housing 10 provided in the image reading apparatus 1B according to Embodiment 2 of the present invention. FIG. 17 is a perspective view of the housing 10 into which the light guides 50R and 50L and the light guide holder 51 are inserted. 18 is a cross-sectional view taken along the line XVIII-XVIII shown in FIG. 19 is a cross-sectional view taken along the line XIX-XIX shown in FIG.

As shown in FIG. 16, the light guide 50R is provided with three convex portions 54R that protrude in the −Y direction from the −Y plane. Further, although not shown in FIG. 16, three convex portions 54 L projecting in the + Y direction are provided on the + Y surface of the light guide 50 L. The three convex portions 54R and the three convex portions 54L are arranged at equal intervals in the X direction.

Each of the convex portion 54R and the convex portion 54L is provided at the −Z end of the light guides 50R and 50L, as shown in FIGS. And each of the convex part 54R and the convex part 54L is formed in the rectangular shape by YZ sectional view. Each of the convex portion 54R and the convex portion 54L has

planes

530R and 530L on the + Z side. The plane 530R is perpendicular to the −Y end surface of the convex portion 54R. The plane 530L is perpendicular to the + Y end surface of the convex portion 54R. Thus, an edge portion 540R is formed between the flat surface 530R and the −Y end surface of the convex portion 54R. Further, an edge portion 540L is formed between the flat surface 530L and the + Y end surface of the convex portion 54L. In this specification, the

planes

530R and 530L are referred to as first planes, and the −Y end face and the + Y end face that intersect with the

planes

530R and 530L are referred to as second planes.

The

planes

530R and 530L are provided to measure the positions of the light guides 50R and 50L when the heights of the light guides 50R and 50L are aligned, similarly to the

planes

510R and 510L described in the first embodiment. ing.

Further, the

edge portions

540R and 540L are used to measure the orientation of the light guides 50R and 50L when the light guides 50R and 50L are fixed, similarly to the

edge portions

520R and 520L described in the first embodiment. Is provided.

The heights of the light guides 50R and 50L are aligned by adjusting the positions of the light guides 50R and 50L while measuring the positions of the

planes

530R and 530L in the Z direction with a camera, a laser displacement meter, or the like. The light guides 50R and 50L are oriented in the main scanning direction by adjusting the directions of the light guides 50R and 50L while imaging the directions of the

edge portions

540R and 540L with a camera.

The image reading apparatus 1B is assembled by adjusting the positions of the light guides 50R and 50L while measuring the positions of the

planes

530R and 530L in the Z direction, and guiding the

edges

540R and 540L while imaging. The direction of the

light bodies

50R and 50L is adjusted, and the

light guide bodies

50R and 50L whose positions are adjusted are bonded to the bottom plate portion 14 by the third bonding portion 72 formed on the bottom plate portion 14 of the housing 10. Except for this, this is the same as in the first embodiment. Therefore, the description thereof is omitted.

As described above, in the image reading apparatus 1B according to the second embodiment, the heights of the light guides 50R and 50L are aligned by measuring and adjusting the positions of the

planes

530R and 530L. The light guides 50R and 50L are oriented in the main scanning direction by measuring and adjusting the directions of the

edge portions

540R and 540L. For this reason, the light guides 50 R and 50 L can emit light uniformly toward the cover glass 20.

As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment. For example, in the first and second embodiments, the first opening 11 formed in the housing 10 is covered with the cover glass 20. However, the present invention is not limited to this. The cover glass 20 may be a transparent plate that transmits light. Therefore, the cover glass 20 is not limited to a transparent plate formed of a glass material, and may be, for example, a transparent plate formed of a resin material that transmits light. In addition, since the cover glass 20 is not restricted to the transparent plate formed with glass, in this specification, the cover glass adhesion process mentioned above is also called a transparent plate adhesion process.

In Embodiments 1 and 2, the first adhesive portion 70 and the second adhesive portion 74 are formed of a moisture-curing adhesive. The third adhesive portion 72 is formed of an ultraviolet curable adhesive. However, the present invention is not limited to this. In the present invention, the first bonding portion 70, the second bonding portion 74, and the third bonding portion 72 may be any material having adhesiveness, and the curing method is arbitrary. For example, the first adhesive part 70, the second adhesive part 74, and the third adhesive part 72 may be an anaerobic curing type, a curing agent mixed type, or the like. In addition, since the 1st adhesion part 70 and the 2nd adhesion part 74 are used for correction | amendment of the curvature or deflection | deviation of the cover glass 20 or the sensor board | substrate 30, the adhesive agent with a large bending adhesive strength or a tensile shear adhesive strength is preferable. . Furthermore, the first adhesive portion 70 and the second adhesive portion 74 are more preferably an adhesive having high toughness.

In Embodiments 1 and 2, the directions of the light guides 50R and 50L are determined by contacting the light guide

direction determining surfaces

610R and 610L provided on the lens holder 61. However, the present invention is not limited to this. The directions of the light guides 50R and 50L may be determined by contacting the

inner walls

15R and 15L of the housing 10. In this case, the orientation of the light guides 50R and 50L is determined by a member different from the lens holder 61 that holds the lens body 60. However, the image reading devices 1A and 1B have a simpler configuration, and the image reading device 1A. The manufacturing cost of 1B can be reduced.

The present invention is capable of various embodiments and modifications without departing from the broad spirit and scope of the present invention. Further, the above-described embodiment is for explaining the present invention, and does not limit the scope of the present invention. That is, the scope of the present invention is shown not by the embodiments but by the claims. Various modifications within the scope of the claims and within the scope of the equivalent invention are considered to be within the scope of the present invention.

This application is based on Japanese Patent Application No. 2018-63493 filed on Mar. 29, 2018. The specification, claims, and entire drawings of Japanese Patent Application No. 2018-63493 are incorporated herein by reference.

1A, 1B image reading device, 10 housing, 11 first opening, 12 support frame, 13 second opening, 14 bottom plate, 15R, 15L inner wall, 16 lens insertion slit, 20 cover glass, 27, 28 gripping area , 30 sensor board, 31 light receiving sensor, 32, 33 gripping area, 40 light source unit, 41 light source element, 42 light source board, 50R, 50L light guide, 51 light guide holder, 52 cover part, 53R, 53L wall part , 54R, 54L convex part, 60 lens body, 61 lens holder, 70 first adhesive part, 71 adhesive, 72 third adhesive part, 73 adhesive, 74 second adhesive part, 510R, 510L plane, 520R, 520L edge Part, 530R, 530L plane, 540R, 540L edge part, 610R, 610L light guide direction Because surface 620 units unit, 630R, 630 L support section, 640 a lens insertion hole, C center, D1, D2 distance, W1, W2, W3, W4 width.

Claims

A first opening extending in the main scanning direction is formed on the first surface side, and a second opening extending in the main scanning direction is formed on the second surface side opposite to the first surface. A housing having a lens body disposed between an opening and the second opening;
A transparent plate provided on the first surface side of the housing and covering the first opening;
A light-receiving sensor that is positioned closer to the second surface than the lens body, transmits the transparent plate, and receives light focused by the lens body;
A sensor substrate provided on the second surface side of the housing and supporting the light receiving sensor;
With
The transparent plate or the sensor substrate is larger than the casing in the sub-scanning direction, protrudes on both sides of the casing in the sub-scanning direction, and is bonded to the casing.
Image reading device.
The transparent plate is larger than the casing in the sub-scanning direction, protrudes on both sides of the casing in the sub-scanning direction, and is on the first surface side of the casing and the sub-scanning of the first opening. Bonded to the first bonding portion provided on both sides of the direction,
The image reading apparatus according to claim 1.
The width of the transparent plate in the sub-scanning direction is smaller than the length of the transparent plate in the main scanning direction.
The image reading apparatus according to claim 2.
The sensor substrate is larger than the casing in the sub-scanning direction, protrudes on both sides of the casing in the sub-scanning direction, and is on the second surface side of the casing and the sub-scanning of the second opening. Bonded by the second bonding portion provided on both sides of the direction,
The image reading apparatus according to claim 1.
The width of the sensor substrate in the sub-scanning direction is smaller than the length of the sensor substrate in the main scanning direction.
The image reading apparatus according to claim 4.
A light guide that is disposed inside the housing, guides light emitted from the light source, and emits the light toward the transparent plate;
The light guide has a first plane on the transparent plate side,
The image reading apparatus according to claim 1.
The light guide has an edge portion between the first plane and a second plane adjacent to the first plane.
The image reading apparatus according to claim 6.
The central portion of the light guide in the main scanning direction is bonded by a third bonding portion provided in the housing.
The image reading apparatus according to claim 6 or 7.
An assembly method for an image reading apparatus according to any one of claims 1 to 8,
An adhesion step of gripping both ends of the transparent plate or the sensor substrate in the sub-scanning direction and abutting on the adhesive applied to the housing to adhere to the housing;
A method for assembling the image reading apparatus.
The bonding step includes
A first adhesive part forming step of forming the first adhesive part by applying the adhesive on the first surface side of the housing and on both sides of the first opening in the sub-scanning direction;
Transparent plate adhesion for gripping both ends of the transparent plate in the sub-scanning direction to correct the warp of the transparent plate and bringing the corrected transparent plate into contact with the first adhesive portion to adhere to the housing Process,
including,
The method for assembling the image reading apparatus according to claim 9.
The bonding step includes
A second adhesive part forming step of forming a second adhesive part by applying the adhesive on the second surface side of the housing and on both sides of the second opening in the sub-scanning direction;
Sensor substrate adhesion for gripping both ends of the sensor substrate in the sub-scanning direction to correct warpage of the sensor substrate, and abutting the corrected sensor substrate to the second adhesive portion to adhere to the housing Process,
including,
The method for assembling the image reading apparatus according to claim 9 or 10.