JP2016174222A - Image sensor unit, image reading device, and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent, when fixing a filter member to a frame with the use of an adhesive, the adhesion to a portion through which light permeates.SOLUTION: An image sensor unit 10 according to the present invention comprises: a light passage part 14 through which a frame 11 causes light to pass from a condensing body 51 toward an image sensor 57; and support parts 12a and 12b which are located on both sides in a sub-scanning direction of the light passage part 14 so as to support a filter member 60. At least one of the support parts 12a and 12b on both sides, namely the support part 12a, has a cutout part 27a which is formed at a position adjacent to the light passage part 14 and in a direction spaced away from the filter member 60. The filter member 60 is fixed to the support part 12a via an adhesive 70 filled between a lateral face 63a of the filter member 60 and the support part 12a.SELECTED DRAWING: Figure 10

Description

  The present invention relates to an image sensor unit, an image reading apparatus, and an image forming apparatus.

  2. Description of the Related Art An image sensor unit that reads an image of an object to be illuminated by imaging light from the object to be illuminated linearly on an image sensor is known. Patent Document 1 discloses a contact image sensor in which an infrared cut filter for reflecting infrared light and transmitting visible light is disposed between a rod lens and an image sensor. The infrared cut filter disclosed in Patent Document 1 is attached to the housing by a flange of a protruding body.

Japanese Patent Laid-Open No. 11-32177

  Here, in order to attach the infrared cut filter to the housing without shifting, it is conceivable to fix the filter using an adhesive. However, when fixing using an adhesive, the adhesive may leak from between the infrared cut filter and the housing due to capillary action, and may adhere to a position where light is transmitted.

  The present invention has been made in view of the above-described problems, and an image sensor unit capable of preventing adhesion to a portion through which light passes when a filter member is fixed to a frame using an adhesive. The purpose is to provide.

An image sensor unit according to the present invention includes an illumination unit that linearly illuminates an object to be illuminated along a main scanning direction, a light collecting body that forms an image of light from the object to be illuminated, and an image formed by the light collecting body. An image sensor that receives the converted light and converts it into an electrical signal, a sensor substrate on which the image sensor is mounted, a frame that houses the illumination unit, the light collector, and the sensor substrate, the light collector, and the light source An image sensor unit having a filter member that is positioned between the image sensor and that cuts light in a predetermined wavelength region out of light that is imaged on the image sensor by the light collector. A light passage portion that allows light to pass from the light collector toward the image sensor, and a support portion that is located on both sides of the light passage portion in the sub-scanning direction and supports the filter member. At least one of the support portions on both sides has a notch formed in a direction away from the filter member at a position adjacent to the light passage portion, and the filter member includes the filter It is fixed to the support part through an adhesive filled between a side surface of the member and the support part.
An image reading apparatus according to the present invention includes the above-described image sensor unit, and a moving unit that relatively moves the image sensor unit and the object to be illuminated.
The image forming apparatus of the present invention forms the image sensor unit described above, a moving unit that relatively moves the image sensor unit and the object to be illuminated, and an image read by the image sensor unit on a recording medium. And an image forming unit.

  ADVANTAGE OF THE INVENTION According to this invention, when fixing a filter member to a flame | frame using an adhesive agent, adhesion to the site | part which light permeate | transmits can be prevented.

FIG. 1 is a cross-sectional view of the image sensor unit. FIG. 2 is a perspective view showing an appearance of an MFP including the image sensor unit. FIG. 3 is a schematic diagram showing the structure of the image forming unit of the MFP. FIG. 4 is an exploded perspective view of the image sensor unit. FIG. 5 is an exploded perspective view showing a part of the image sensor unit. FIG. 6 is a bottom view of the frame to which the filter member is fixed. FIG. 7 is an enlarged perspective view centering on the filling portion of the filter mounting portion. FIG. 8A is a plan view centering on the filling portion of the filter mounting portion. FIG. 8B is a plan view centering on the filling portion of the filter mounting portion, with the filter member omitted. 9A is a cross-sectional view taken along the line II of FIG. 8A. 9B is a cross-sectional view taken along the line II-II in FIG. 8A. 9C is a cross-sectional view taken along line III-III in FIG. 8A. FIG. 10 is an enlarged view of FIG. 9B.

Hereinafter, embodiments to which the present invention can be applied will be described in detail with reference to the drawings. The present embodiment is an image sensor unit 10, and an image reading apparatus and an image forming apparatus to which the image sensor unit 10 is applied. In the image reading apparatus and the image forming apparatus, the image sensor unit 10 emits light to the original P as an illuminated body, and reads the image by converting the reflected light into an electric signal.
In the following description, three-dimensional directions are indicated by X, Y, and Z arrows. The X direction is the main scanning direction, the Y direction is the sub scanning direction perpendicular to the main scanning direction, and the Z direction is the vertical direction (up and down direction).

(First embodiment)
First, the structure of a multi-function printer (MFP) that is an example of an image reading apparatus or an image forming apparatus according to the present embodiment will be described with reference to FIG. FIG. 2 is a perspective view showing an appearance of MFP 100. As shown in FIG. 2, the MFP 100 forms (prints) an image of the original P on an image reading unit 102 as an image reading unit that reads reflected light from the original P and a sheet 101 (recording paper) as a recording medium. And an image forming unit 113 as image forming means.

The image reading unit 102 has a so-called image scanner function, and is configured as follows, for example. The image reading unit 102 includes a housing 103, a platen glass 104 made of a glass transparent plate serving as a document placement unit, and a platen provided so as to be openable and closable with respect to the housing 103 so as to cover the document P. And a cover 105.
An image sensor unit 10 including a lighting device, a holding member 106, a slide shaft 107, a drive motor 108, a wire 109, a signal processing unit 110, a collection unit 111, a paper feed tray 112, and the like are accommodated in the housing 103. ing.

  The image sensor unit 10 is, for example, a contact image sensor (CIS) unit. The holding member 106 holds the image sensor unit 10 so as to surround it. The slide shaft 107 guides the holding member 106 in the sub scanning direction along the platen glass 104. The drive motor 108 is a moving unit that relatively moves the image sensor unit 10 and the document P, and specifically moves a wire 109 attached to the holding member 106. The collection unit 111 is provided so as to be openable and closable with respect to the housing 103 and collects the printed sheet 101. The sheet feed tray 112 stores sheets 101 having a predetermined size.

  In the image reading unit 102 configured as described above, the drive motor 108 moves the image sensor unit 10 along the slide shaft 107 in the sub-scanning direction. At this time, the image sensor unit 10 performs an image reading operation by optically reading the document P placed on the platen glass 104 and converting it into an electrical signal.

FIG. 3 is a schematic view showing the structure of the image forming unit 113.
The image forming unit 113 has a so-called printer function, and is configured as follows, for example. The image forming unit 113 is accommodated in the housing 103 and includes a conveyance roller 114 and a recording head 115 as shown in FIG. The recording head 115 includes, for example, ink tanks 116 (116c, 116m, 116y, and 116k) that include cyan C, magenta M, yellow Y, and black K inks, and ejection heads 117 ( 117c, 117m, 117y, 117k). The image forming unit 113 includes a recording head slide shaft 118, a recording head drive motor 119, and a belt 120 attached to the recording head 115.

In the image forming unit 113 configured as described above, the sheet 101 supplied from the paper feed tray 112 is transported to the recording position by the transport roller 114. The recording head 115 mechanically moves the belt 120 by the recording head driving motor 119, and moves in the printing direction (main scanning direction) along the recording head slide shaft 118 while moving the belt 120 with respect to the sheet 101 based on the electrical signal. Print. After the above-described operation is repeated until the end of printing, the printed sheet 101 is discharged to the collection unit 111 by the conveyance roller 114.
Although an image forming apparatus using an inkjet method has been described as the image forming unit 113, any method such as an electrophotographic method, a thermal transfer method, or a dot impact method may be used.

  A configuration of the image sensor unit 10 of the present embodiment will be described with reference to the drawings. FIG. 1 is a cross-sectional view of the image sensor unit 10 cut along the sub-scanning direction. FIG. 4 is an exploded perspective view of the image sensor unit 10. FIG. 5 is an exploded perspective view showing a part of the image sensor unit 10.

  The image sensor unit 10 includes a frame 11, a light guide unit 35, a light source unit 40, a light collector 51, a sensor substrate 53, an image sensor 57, a filter member 60, and the like. Of the constituent members described above, the configuration including the light guide unit 35 and the light source unit 40 is an example of an illumination unit and functions as an illumination device. Of the above-described constituent members, the frame 11, the light guide 35, the light collector 51, the sensor substrate 53, the image sensor 57, and the filter member 60 have lengths corresponding to the dimensions of the document P to be read in the main scanning direction. It is formed.

The frame 11 accommodates each component of the image sensor unit 10. The frame 11 is a substantially rectangular parallelepiped that is long in the main scanning direction, and is formed so that each component can be positioned and supported therein.
As shown in FIG. 1, the frame 11 is divided into upper and lower portions by a support portion 12 formed in the horizontal direction. The support portion 12 includes a first support portion 12a extending from one side wall 13a in the sub-scanning direction of the frame 11, and a second support portion 12b extending from the other side wall 13b. Between the first support portion 12a and the second support portion 12b, a light passage portion 14 for allowing light to pass is formed along the main scanning direction. The support unit 12 supports the light guide unit 35, the light collector 51, the filter member 60, and the like.

The frame 11 has a first accommodating portion 15a formed on the upper side with the support portion 12 therebetween, and a second accommodating portion 15b formed on the lower side.
The first housing portion 15 a includes a light collector housing portion 16 that houses the light collector 51 and a light guide housing portion 17 that houses the light guide portion 35. The condenser housing portion 16 is located above the light passage portion 14 and is formed along the main scanning direction. The light collecting body 51 is fixed using, for example, an adhesive in a state of being housed in the light collecting body housing portion 16. The light guide housing portion 17 includes a first light guide body housing portion 17a and a second light guide body housing portion 17b with the light collector 51 interposed therebetween, and is formed along the main scanning direction. Each of the first light guide housing portion 17a and the second light guide body housing portion 17b is formed with a plurality of locking pieces 18 for locking the light guide portion 35 at intervals in the main scanning direction. . The light guide 35 is detachably attached to the first light guide housing 17a and the second light guide housing 17b by elastically deforming the locking piece 18.

  The second accommodating portion 15 b includes a sensor substrate accommodating portion 19 that accommodates the sensor substrate 53 and a filter attachment portion 20 to which the filter member 60 is attached. The sensor substrate housing portion 19 is formed along the main scanning direction. The sensor substrate 53 is fixed by, for example, heat caulking while being accommodated in the sensor substrate accommodating portion 19. The filter attachment portion 20 is formed along the main scanning direction. The filter member 60 is in contact with the first support portion 12a and the second support portion 12b constituting the filter attachment portion 20, and is fixed using the adhesive 70 in a state straddling both. A specific configuration of the filter mounting portion 20 will be described later.

As shown in FIG. 4, the frame 11 has light source accommodation portions 21 in which the light source portions 40 are accommodated at both ends in the main scanning direction. The light source housing part 21 opens in the vertical direction of the frame 11, and a part thereof communicates with the light guide housing part 17.
The frame 11 is formed of, for example, a resin material having a light shielding property colored in black. For example, polycarbonate can be used as the resin material.

The light guide 35 illuminates the original P linearly along the main scanning direction. The light guide unit 35 of the present embodiment includes a first light guide 36a and a second light guide 36b. Here, the first light guide 36a will be mainly described.
The first light guide 36a is formed in a rod shape that is long in the main scanning direction. As shown in FIG. 5, the first light guide 36 a has an incident surface 37 on which light from the light source unit 40 is incident at one end in the main scanning direction. In addition, the first light guide 36 a is formed with an exit surface 38 that emits light incident on the first light guide 36 a toward the document P on the surface facing the document P. The emission surface 38 is formed in a convex arc shape on the upper side. In addition, the first light guide 36a reflects light incident from the incident surface 37 toward the output surface 38 on the surface facing the output surface 38 or in the longitudinal direction of the first light guide 36a. A reflecting surface 39 that reflects the light is formed. Further, the surfaces other than the emission surface 38 and the reflection surface 39 function as reflection surfaces that reflect incident light, respectively. The first light guide 36a is formed of a transparent material such as an acrylic resin.
The second light guide 36b is symmetric with respect to the central axis Oc (see FIG. 4) of the light collector 51 with respect to the first light guide 36a. The configuration is the same as 36a.

The light source unit 40 emits light to the light guide unit 35. The light source unit 40 of the present embodiment includes a first light source 41a and a second light source 41b. Here, the first light source 41a will be mainly described.
The 1st light source 41a is arrange | positioned facing the entrance plane 37 of the 1st light guide 36a. As shown in FIG. 5, the first light source 41a can be a so-called top view type surface mount type LED package in which an LED chip as a light emitting element is mounted on the surface. Here, the first light source 41a is arranged in a state where an LED chip that emits light having a blue emission wavelength is sealed with a resin containing a phosphor. Accordingly, the first light source 41a emits white light. Note that the LED chips disposed in the first light source 41a may be a plurality of LED chips that emit light having emission wavelengths of red, green, and blue, respectively. Further, the LED chip disposed in the first light source 41a is not limited to visible light, and may be an LED chip that emits infrared or ultraviolet emission wavelengths to read an image printed with invisible ink on the document P. Good.
In addition, the 2nd light source 41b is comprised similarly to the 1st light source 41a.

The first light source 41 a is mounted on the wiring board 42. The first light source 41 a emits light by receiving power supply from the outside via a wiring pattern formed on the wiring board 42. A light shielding member 45 is coupled to the wiring board 42 through a plurality of positioning holes 43.
The light shielding member 45 includes a light shielding portion 46 and a main body portion 47, and is formed in a substantially L shape when viewed from the sub-scanning direction. The light shielding part 46 extends from the main body part 47 toward the first light guide 36a. The light-shielding part 46 covers the emission surface 38 close to one end part in the main scanning direction of the first light guide 36a from above. Accordingly, it is possible to block the leaked light emitted from the first light source 41a directly to the document P by the light blocking unit 46. The main body 47 is formed with a plurality of positioning protrusions 48 that are inserted into the positioning holes 43 of the wiring board 42. The main body 47 has an opening 49 penetrating in the main scanning direction substantially at the center. When the wiring board 42 on which the first light source 41 a is mounted and the light shielding member 45 are coupled via the positioning hole 43 and the positioning projection 48, the first light source 41 a is disposed in the opening 49.
The wiring board 42 on which the first light source 41 a is mounted and the light shielding member 45 are combined and disposed in the light source housing portion 21 of the frame 11.
The second light source 41b is also mounted on the wiring board 42, like the first light source 41a, and the light shielding member 45 is coupled to the wiring board 42.

  The condenser 51 forms an image of light from the document P on the image sensor 57. For example, a rod lens array in which a plurality of erecting equal-magnification imaging elements (rod lenses) are linearly arranged in the main scanning direction can be applied to the condenser 51. The light collector 51 is not limited to the above-described configuration as long as it can form an image on the image sensor 57. As the condensing body 51, conventionally known optical members having various condensing functions such as various microlens arrays can be applied.

  The sensor substrate 53 is mounted on the mounting surface 54 with a drive circuit for causing the image sensor 57, the first light source 41 a and the second light source 41 b to emit light, and driving the image sensor 57. The sensor substrate 53 is formed in a flat plate shape having the main scanning direction as a longitudinal direction. The sensor substrate 53 has bonding holes 55 formed at one end and the other end in the main scanning direction for bonding the wiring board 42. The wiring board 42 is joined by soldering or the like in the state of being inserted into the joint hole 55 of the sensor substrate 53, whereby the drive circuit of the sensor substrate 53 and the first light source 41a and the second light source 41b are electrically connected. Connected to.

  The image sensor 57 receives the light imaged by the light collector 51 and converts it into an electrical signal. The image sensor 57 is disposed below the light collector 51. As shown in FIG. 5, the image sensor 57 has a predetermined number of image sensor ICs 58 each composed of a plurality of light receiving elements (the light receiving elements may also be photoelectric conversion elements) corresponding to the reading resolution of the image sensor unit 10. The sensor board 53 is mounted on the mounting surface 54 in a linear arrangement in the main scanning direction. The image sensor 57 is not limited to the above-described configuration as long as it can convert light reflected from the document P into an electrical signal. Various conventionally known image sensor ICs can be applied to the image sensor IC 58.

  The filter member 60 cuts light in a predetermined wavelength region from the light imaged on the image sensor 57 by the light collector 51. The filter member 60 has a rod shape whose longitudinal direction is the main scanning direction, and has a rectangular cross-sectional shape. Specifically, the filter member 60 includes a filter incident surface 61, a filter emission surface 62, and side surfaces 63a and 63b. Light from the condenser 51 is incident on the filter incident surface 61. A part of the filter incident surface 61 is supported by the support portion 12 of the frame 11. The filter emission surface 62 emits light outside the wavelength region cut in the filter member 60. The side surfaces 63a and 63b are surfaces that do not come into contact with the support portion 12 and constitute application surfaces of the adhesive 70. The filter member 60 is fixed to the filter mounting portion 20 of the frame 11 at a position between the light collector 51 and the image sensor 57. The filter member 60 of the present embodiment cuts light with an infrared emission wavelength. For the filter member 60, for example, vapor deposition glass can be applied.

  In the image sensor unit 10 configured as described above, by causing the first light source 41a and the second light source 41b to emit light, as shown in FIG. 1, the first light guide 36a and the second light guide. Light is emitted from the body 36b to the lower surface of the document P as indicated by arrows R1 and R2. Therefore, light is emitted linearly along the reading line S (main scanning direction) to the original P. The light is reflected by the original P, and the light is imaged on the image sensor 57 via the condenser 51. At this time, the filter member 60 cuts off light having an infrared emission wavelength, thereby preventing noise from being imaged. The image sensor 57 can read the image on the lower surface of the document P by converting the imaged light into an electrical signal.

  When the image sensor 57 reads the light for one scanning line, the reading operation for one scanning line in the main scanning direction of the document P is completed. After the reading operation for one scanning line is completed, the reading operation for the next one scanning line is performed in the same manner as the above-described operation with the relative movement of the document P in the sub-scanning direction. As described above, the image sensor unit 10 repeats the reading operation for each scanning line while moving in the sub-scanning direction, whereby the entire surface of the document P is sequentially scanned to read the image.

  In the image sensor unit 10 configured as described above, the filter member 60 is fixed by the adhesive 70 filled in the filter mounting portion 20 in order to fix the filter member 60 to the filter mounting portion 20 of the frame 11 so as not to be displaced. To do. At this time, the adhesive 70 may permeate between the support portion 12 and the filter member 60 by capillary action, and the adhesive may adhere to a position on the filter incident surface 61 where light is transmitted. In this case, the image sensor 57 cannot accurately read the image of the document P due to the adhesive adhered to the filter member 60.

  Therefore, the filter mounting portion 20 of the present embodiment is configured so that the adhesive does not adhere to the position where the light of the filter member 60 is transmitted. Hereinafter, a specific configuration will be described with reference to FIGS. In addition, when attaching the filter member 60 to the filter attachment part 20, since it carries out in the state which turned the frame 11 upside down, each figure of FIGS. 6-10 is illustrated in the state which reversed the up-down direction. Yes. Therefore, in the following, for ease of understanding, the vertical direction is expressed using the document side and the housing side.

FIG. 6 is a bottom view of the frame 11 to which the filter member 60 is fixed, and the sensor substrate 53 is omitted.
The filter mounting portion 20 of the present embodiment includes a filling portion 22 that is filled with an adhesive, a non-filling portion 23 that is not filled with an adhesive, and a boundary portion 24 that is a boundary between the filling portion 22 and the non-filling portion 23. .
As shown in FIG. 6, most of the filter mounting portion 20 is the non-filling portion 23, and the filling portion 22 is located at an interval in the main scanning direction.

  FIG. 7 is an enlarged perspective view enlarging the A portion shown in FIG. 6, that is, the filling portion 22. FIG. 8A is an enlarged view of an A portion shown in FIG. FIG. 8B is a diagram in which the filter member 60 and the adhesive 70 are omitted from FIG. 8A. 9A is a cross-sectional view taken along the line II of FIG. 8A, that is, a cross-sectional shape of the non-filling portion 23. FIG. 9B is a cross-sectional view taken along the line II-II in FIG. 8A, that is, a cross-sectional shape of the filling portion 22. 9C is a cross-sectional view taken along the line III-III in FIG. 8A, that is, a cross-sectional shape of the boundary portion 24.

First, the cross-sectional shape of the non-filling part 23 is demonstrated with reference to FIG. 9A.
A first support portion 12a and a second support portion 12b are located on both sides in the sub-scanning direction with the light passage portion 14 interposed therebetween. The light passage portion 14 is formed such that the width in the sub-scanning direction is increased toward the housing side (upper side in FIG. 9A). As shown in FIG. 9A, the support surface 25a of the first support portion 12a and the support surface 25b of the second support portion 12b are in contact with both sides of the filter incident surface 61 of the filter member 60 in the sub-scanning direction. The member 60 is supported. Accordingly, light does not enter the filter incident surface 61 via the light passage portion 14 because the filter incident surface 61 does not contact the support portion 12 at the center in the sub-scanning direction. The width in the sub-scanning direction in which the filter member 60 and the support portion 12 are not in contact is hereinafter referred to as a non-contact width. Here, the non-contact width is W1.

  Moreover, as shown to FIG. 9A, the non-filling part 23 is the 1st wall part erected toward the housing | casing side from the support surface 25a of the 1st support part 12a, and the support surface 25b of the 2nd support part 12b. 26a and a second wall portion 26b. The first wall portion 26a and the second wall portion 26b are respectively formed along the main scanning direction, and face the side surface 63a and the side surface 63b of the filter member 60.

In the first wall portion 26a and the second wall portion 26b, the height H1 from the support surface 25a of the first support portion 12a and the support surface 25b of the second support portion 12b is based on the thickness T of the filter member 60, respectively. Is also formed high. The distance L1a from the center line Ol of the light passage portion 14 to the first wall portion 26a is formed longer than the distance L1b from the center line Ol of the light passage portion 14 to the second wall portion 26b.
The first wall portion 26a and the second wall portion 26b are located on both sides in the sub-scanning direction with the image sensor 57 sandwiched in a state where the sensor substrate 53 is accommodated in the sensor substrate accommodating portion 19 (see FIG. 1). ). Therefore, the first wall portion 26 a and the second wall portion 26 b shield stray light that has entered the frame 11 and prevent the stray light from being imaged on the image sensor 57.

Next, the cross-sectional shape of the filling portion 22 will be described with reference to FIG. 9B.
As with the non-filling portion 23, the filling portion 22 has both the support surface 25 a of the first support portion 12 a and the support surface 25 b of the second support portion 12 b on both sides of the filter incident surface 61 of the filter member 60 in the sub-scanning direction. The filter member 60 is supported by contact. On the other hand, unlike the non-filling portion 23, the first support portion 12 a and the second support portion 12 b of the filling portion 22 are formed with groove-shaped cutout portions 27 a and cutout portions 27 b at positions adjacent to the light passage portion 14. Is done. The notch 27a and the notch 27b function as a reservoir for storing the leaked adhesive 70 as will be described later.

  The notch 27a and the notch 27b are formed by digging the support surface 25a and the support surface 25b, respectively. The cutout portion 27a and the cutout portion 27b are spaced apart from the filter incident surface 61 by a predetermined distance, and a plane 28a and a plane 28b that are parallel and horizontal to the filter incident surface 61 are formed. Thus, by forming the notch part 27a and the notch part 27b, the non-contact width W2 in the filling part 22 is formed wider than the non-contact width W1 shown in FIG. 9A.

The filling portion 22 is formed such that the first wall portion 26a and the second wall portion 26b are not formed, and the nozzle filling the adhesive can freely move. On the other hand, the filling portion 22 is formed such that the step portion 29a and the step portion 29b are inclined at positions facing the side surface 63a and the side surface 63b of the filter member 60, respectively. The step portion 29a and the step portion 29b are formed higher than the support surface 25a of the first support portion 12a and the support surface 25b of the second support portion 12b. The height H2 of the stepped portion 29a and the stepped portion 29b from the support surface 25a and the support surface 25b is formed lower than the thickness T of the filter member 60 so that the nozzle filling the adhesive does not interfere.
The adhesive 70 is formed between the first support portion 12a and the side surface 63a of the filter member 60 in the state where the filter member 60 is supported by the first support portion 12a and the second support portion 12b, and the second The support portion 12b and the side surface 63b of the filter member 60 are filled. At this time, the stepped portion 29a and the stepped portion 29b are dammed so as not to flow in the sub-scanning direction until the filled adhesive 70 is cured. As described above, the stepped portion 29a and the stepped portion 29b function as a sub-scanning direction blocking portion that blocks the adhesive 70 so as not to flow in the sub-scanning direction. The filter member 60 is fixed to the support portion 12 of the frame 11 via the cured adhesive 70. For example, an ultraviolet curable adhesive that is cured by ultraviolet rays can be applied to the adhesive 70.

Next, the cross-sectional shape of the boundary portion 24 will be described with reference to FIG. 9C.
In the boundary part 24, similarly to the filling part 22, a notch part 27 a and a notch part 27 b are formed at positions adjacent to the light passing part 14.
In addition, the boundary portion 24 is formed with a first wall portion 26 a and a second wall portion 26 b, similarly to the non-filling portion 23. Accordingly, the first wall portion 26a is formed between the adjacent step portions 29a in the main scanning direction, and the second wall portion 26b is formed between the adjacent step portions 29b in the main scanning direction.
On the other hand, unlike the non-filling part 23, the boundary part 24 has the wall part 30 standingly arranged toward the housing | casing side (upper side in FIG. 9C) from the support surface 25a of the 1st support part 12a. Therefore, as shown in FIGS. 8A and 8B, the wall portions 30 are formed on both sides of the step portion 29a in the main scanning direction in plan view.

  The wall portion 30 extends from the first wall portion 26 a toward the filter member 60. Therefore, in the boundary portion 24, the distance L3a from the center line Ol of the light passage portion 14 to the wall portion 30 is shorter than the distance L1a from the center line Ol of the light passage portion 14 to the first wall portion 26a shown in FIG. 9A. It is formed. The wall portion 30 is dammed so as not to flow in the main scanning direction, that is, the non-filling portion 23 until the adhesive 70 filled in the filling portion 22 is cured. As described above, the wall portion 30 functions as a main scanning direction damming portion that dams the adhesive 70 so as not to flow in the main scanning direction.

  Further, an inclined surface 31 is formed on the wall member 30 on the filter member 60 side. The inclined surface 31 guides the filter member 60 (filter member 60 indicated by a two-dot chain line in FIG. 9C) inserted from the housing side to the support portion 12. Therefore, the filter member 60 can be easily inserted between the first wall portion 26 a and the second wall portion 26 b by the inclined surface 31. As shown by a two-dot chain line in FIG. 9C, the inclined surface 31 does not reach the notch 27a when the inclined surface 31 is extended toward the document side, and the support surface 25a of the first support portion 12a. It is formed at an inclination angle that intersects with. Therefore, when the filter member 60 is guided by the inclined surface 31, the filter member 60 is prevented from being inserted into the cutout portion 27a.

Next, the operation of the notch 27a and the notch 27b will be described with reference to FIG.
FIG. 10 is an enlarged view of FIG. 9B.
As shown in FIG. 10, the adhesive 70 is filled between the first support portion 12a and the side surface 63a of the filter member 60, and between the second support portion 12b and the side surface 63b of the filter member 60. The Part of the filled adhesive 70 leaks from between the filter incident surface 61 and the support surface 25a and between the filter incident surface 61 and the support surface 25b by capillary action. At this time, the leaked adhesive 71 is stored in the notch 27 a and the notch 27 b formed adjacent to the light passage part 14. Therefore, the adhesive 71 can be prevented from adhering to a portion of the filter incident surface 61 where light is transmitted (I portion as shown in FIG. 10). Here, the portion where light is transmitted refers to a region where the narrowest passage width of the light passage portion 14 is projected onto the filter incident surface 61. Since the cutout portion 27a and the cutout portion 27b are formed with a flat plane 28a and a flat plane 28b that are parallel to and parallel to the filter incident surface 61, the light passage section 14 is provided even when the adhesive 71 is not cured. To flow toward the. Note that the plane 28a and the plane 28b are not limited to being horizontal, and may be inclined so that the light passing portion 14 side becomes higher, as indicated by a two-dot chain line in FIG.

  Further, as shown in FIG. 8B, the cutout portion 27a and the cutout portion 27b are formed such that the length lg in the main scanning direction is longer than the length of the stepped portion 29a and the stepped portion 29b (length of the filling portion 22) Lf. The Here, the cutout portion 27a and the cutout portion 27b are formed up to a position beyond the wall portion 30 (beyond the boundary portion 24 and the non-filling portion 23). Therefore, even if a large amount of the adhesive 71 leaks, the adhesive 71 can be stored by the notches 27a and 27b that are formed long in the main scanning direction.

  As described above, the image sensor unit 10 of the present embodiment is located on both sides of the light passage portion 14 in the sub-scanning direction, and the support portion 12 that supports the filter member 60 is located at a position adjacent to the light passage portion 14. It has notches 27 a and 27 b formed in a direction away from 60. Therefore, the adhesive 71 leaked from between the filter member 60 and the support portion 12 is stored in the cutout portion 27a and the cutout portion 27b. Therefore, it is possible to prevent the adhesive 71 from adhering to a portion of the filter incident surface 61 through which light is transmitted.

As mentioned above, although this invention was demonstrated with embodiment mentioned above, this invention is not limited only to embodiment mentioned above, A change etc. are possible within the scope of the present invention.
Although the frame 11 of the present embodiment has been described with respect to the case where the cutout portion 27a and the cutout portion 27b are formed in the first support portion 12a and the second support portion 12b, the present invention is not limited to this case. That is, a cutout portion may be formed in only one of the first support portion 12a and the second support portion 12b. In this case, it is preferable to fill the adhesive 70 only on the side where the notch is formed.

Although the light guide part 35 of this embodiment demonstrated the case where it had the 1st light guide 36a and the 2nd light guide 36b, it is not restricted to this case, The 1st light guide 36a and the 2nd light guide Only one of the light guides 36b may be provided.
Although the light source part 40 of this embodiment demonstrated the case where it had the 1st light source 41a and the 2nd light source 41b, it is not restricted to this case, One of the 1st light source 41a and the 2nd light source 41b It may be only.
Although the illumination part of this embodiment demonstrated the case where it comprised from the light guide part 35 and the light source part 40, it is not restricted to this case, For example, by arranging an LED package in the main scanning direction like an LED array, for example. The original P may be illuminated linearly.

In the frame 11 of the present embodiment, the case where the filter mounting portion 20 has the filling portion 22, the non-filling portion 23, and the boundary portion 24 has been described. However, the present invention is not limited to this, and the filter mounting portion 20 is only the filling portion 22. May be.
Although the frame 11 of this embodiment demonstrated the case where the inclined surface 31 was formed in the wall part 30 of the boundary part 24, it is not restricted to this case, The inclined surface 31 does not need to be formed.
Although the filter member 60 of this embodiment demonstrated the case where the light of an infrared wavelength range was cut, it is not restricted to this case, What is necessary is just to be comprised so that the light of the desired wavelength range can be cut.

  DESCRIPTION OF SYMBOLS 10: Image sensor unit 11: Frame 12: Support part 12a: 1st support part 12b: 2nd support part 14: Light passage part 20: Filter attachment part 22: Filling part 23: Non-filling part 24: Boundary part 26a : 1st wall part 26b: 2nd wall part 27a, 27b: Notch part 31: Inclined surface 51: Condensing body 53: Sensor board | substrate 57: Image sensor 60: Filter member 70: Adhesive agent 71: Adhesive agent 100: MFP (image reading apparatus, image forming apparatus) 102: image reading unit 113: image forming unit

Claims (9)

An illumination unit that illuminates the object to be illuminated in a line along the main scanning direction;
A condenser for imaging light from the illuminated body;
An image sensor that receives light imaged by the light collector and converts it into an electrical signal;
A sensor substrate on which the image sensor is mounted;
A frame that houses the illumination unit, the light collector, and the sensor substrate;
An image sensor unit having a filter member that is positioned between the light collector and the image sensor and that cuts light in a predetermined wavelength region of light focused on the image sensor by the light collector. There,
The frame is
A light passage portion that allows light to pass from the light collector to the image sensor;
A support part that is located on both sides in the sub-scanning direction of the light passage part and supports the filter member;
At least one of the support portions on both sides has a notch formed in a direction away from the filter member at a position adjacent to the light passage portion,
The image sensor unit, wherein the filter member is fixed to the support portion via an adhesive filled between a side surface of the filter member and the support portion.   2. The image according to claim 1, wherein the frame has a sub-scanning direction blocking portion that blocks the flow of the adhesive in the sub-scanning direction at a position away from the filter member in the sub-scanning direction. Sensor unit.   The said frame has the main scanning direction damming part which dams the flow to the main scanning direction of the said adhesive on both sides in the main scanning direction of the said sub scanning direction damming part. Image sensor unit.   The image sensor unit according to claim 3, wherein the main scanning direction damming portion has an inclined surface on the filter member side so as to guide the filter member to the support portion.   The image sensor unit according to claim 4, wherein the inclined surface intersects a support surface that supports the filter member in the support portion when the inclined surface is extended toward the support portion.   The length in the main scanning direction of the notch portion is longer than the length in the main scanning direction between the main scanning direction damming portions adjacent to each other across the sub scanning direction damming portion. The image sensor unit according to any one of 5.   The said frame has a wall part standingly arranged from the said support part between the said sub-scanning direction dam parts adjacent to the main scanning direction, The any one of Claim 2 thru | or 6 characterized by the above-mentioned. Image sensor unit. The image sensor unit according to any one of claims 1 to 7,
A moving unit that relatively moves the image sensor unit and the object to be illuminated;
An image reading apparatus comprising: The image sensor unit according to any one of claims 1 to 7,
A moving unit that relatively moves the image sensor unit and the object to be illuminated;
An image forming apparatus comprising: an image forming unit that forms an image read by the image sensor unit on a recording medium.

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