JP2015128247A - Image sensor unit, image reader, and image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the contact of flowed-out sealant with a wire.SOLUTION: An image sensor unit 10 includes a light condensing body 30 imaging light from a document P, an image sensor 35 receiving the light imaged by the light condensing body 30, to convert it into an electrical signal, a substrate 40 on which the image sensor 35 is mounted, a wire 37 connected to the substrate 40 from the image sensor 35, and a frame 11 storing the light condensing body 30 and fixing the substrate 40 through a sealant S. The frame 11 includes an inside contact part 15 brought into contact with the surface of the substrate 40 through the sealant S. The substrate 40 includes a groove 50 formed between the inside contact part 15, and the image sensor 35 and the wire 37, to dam the sealant S flowing out toward the central part of the substrate 40.

Description

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

  Conventionally, an image sensor unit used for an image scanner or the like is known. Patent Document 1 discloses a contact image sensor including a frame, a rod lens array, a sensor IC, and a sensor substrate. In the contact image sensor of Patent Document 1, when a sensor substrate on which a sensor IC is mounted is accommodated in a frame, the frame and the sensor substrate are fixed by screws or a sealing agent.

JP 2013-172366 A

  When the frame and the sensor substrate are bonded with a sealing agent, a part of the sealing agent protrudes from between the frame and the sensor substrate and flows out toward the center of the sensor substrate along the surface of the sensor substrate. When the sealant that has flowed out contacts the wire that electrically connects the sensor IC and the sensor substrate, the wire may be disconnected.

  The present invention has been made in view of the above-described problems, and an object thereof is to prevent the leaked sealing agent from contacting the wire.

An image sensor unit of the present invention includes a light collecting body that forms an image of light from an object to be read, an image sensor that receives light formed by the light collecting body and converts the light into an electrical signal, and the image sensor. An image sensor unit comprising: a substrate to be mounted; a wire connected from the image sensor to the substrate; and a container that houses the light collector and fixes the substrate via a sealing agent, The container includes a contact portion that is in contact with the surface of the substrate via the sealing agent, and the substrate is a weir formed between the contact portion, the image sensor, and the wire. The sealing agent flowing out toward the central portion of the substrate is blocked by having a stop portion.
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 reading object.
The image forming apparatus according to the present invention forms the image sensor unit described above, a moving unit that relatively moves the image sensor unit and the reading object, and an image read by the image sensor unit on a recording medium. And an image forming unit.

  According to the present invention, since the blocking portion for blocking the sealing agent is formed on the substrate, the leaked sealing agent can be prevented from coming into contact with the wire.

FIG. 1 is a cross-sectional view showing a groove 50 as a damming portion according to the first embodiment. FIG. 2 is a perspective view illustrating an appearance of the MFP 100 including the image sensor unit 10. FIG. 3 is a schematic diagram illustrating the structure of the image forming unit 113 of the MFP 100. FIG. 4 is an exploded perspective view of the image sensor unit 10. FIG. 5 is a cross-sectional view of the image sensor unit 10. FIG. 6 is a plan view of the substrate 40. FIG. 7A is a cross-sectional view showing a groove 56 as a damming portion of the second embodiment. FIG. 7B is a cross-sectional view showing a groove 58 as a damming portion of the third embodiment. FIG. 7C is a cross-sectional view showing a protrusion 60 as a damming portion of the fourth embodiment. FIG. 8A is a plan view showing a groove 62 as a damming portion of the fifth embodiment. FIG. 8B is a plan view showing a groove 64 as a damming portion according to the sixth embodiment. FIG. 8C is a plan view showing a groove 66 as a damming portion according to the seventh embodiment.

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 irradiates a document P as a reading object with light, and converts reflected light into an electrical signal to read an image.
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, 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.
The housing 103 accommodates the image sensor unit 10, the holding member 106, the image sensor unit slide shaft 107, the image sensor unit drive motor 108, the wire 109, the signal processing unit 110, the collection unit 111, the paper feed tray 112, and the like. Has been.

  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 image sensor unit slide shaft 107 guides the holding member 106 along the platen glass 104 in the sub-scanning direction. The image sensor unit 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 image sensor unit drive motor 108 moves the image sensor unit 10 in the sub-scanning direction along the image sensor unit slide shaft 107. 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.

Next, the image sensor unit 10 of the present embodiment will be described with reference to the drawings. FIG. 4 is an exploded perspective view of the image sensor unit 10. FIG. 5 is a cross-sectional view of the image sensor unit 10 cut in the sub-scanning direction.
The image sensor unit 10 includes a frame 11, a cover glass 18, a light source unit 20, a light collector 30, a substrate 40, an image sensor 35, and the like. The above-described constituent members are formed in a length corresponding to the dimension of the original P to be read in the main scanning direction.

  The frame 11 is a container that houses 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 inside so that each component can be positioned and supported. For the frame 11, for example, a resin material such as polycarbonate colored in black and having a light shielding property can be applied.

As shown in FIG. 5, a substrate housing portion 12 for arranging the substrate 40 is formed in a concave shape on the lower side of the frame 11 in the main scanning direction. The substrate accommodating portion 12 of the present embodiment has an outer contact portion 14 and an inner contact portion 15 as contact portions that contact the substrate 40. As will be described later, the inner contact portion 15 is in contact with the substrate 40 via the sealing agent S.
The outer contact portion 14 is formed so as to protrude downward from the outer peripheral edge of the frame body 13. The outer contact portion 14 has a stepped cross section and supports the outer peripheral edge of the substrate 40 over the entire circumference.
The inner contact portion 15 is formed so as to protrude downward from the lower surface of the frame body 13. The inner contact portion 15 supports the substrate 40 by contacting the surface of the substrate 40. The substrate housing portion 12 fixes the substrate 40 via the sealing agent S applied to the lower surface of the inner contact portion 15.
As shown in a cross-sectional view of FIG. 6 to be described later, the inner contact portion 15 of the present embodiment has four sides 15a so as to surround a region R in which the image sensor 35 is mounted in the substrate 40 when viewed from above. It is formed in a rectangular shape of 15b, 15c, 15d. Therefore, the space between the lower surface of the inner contact portion 15 and the surface of the substrate 40 is sealed with the sealing agent S so that dust or the like does not enter the region R.

  The cover glass 18 is a cover member that prevents dust from entering the frame 11 by covering the frame 11 from above. The cover glass 18 is formed in a flat plate shape that is long in the main scanning direction. The cover glass 18 is not limited to glass, and for example, a member having a hard coat applied to the surface of a transparent resin material such as acrylic or polycarbonate as needed can be applied.

  The light source unit 20 emits line-shaped light to the document P in the main scanning direction. The light source unit 20 includes a light source 21 and a light guide body 25. As the light source 21, an LED module 23 in which an LED chip 22 as a light emitting element is disposed is used. Here, the plurality of LED chips 22 are arranged on the surface of the LED module 23 while being sealed with a transparent resin. As the plurality of LED chips 22, for example, LED chips that emit red, green, and blue emission wavelengths can be applied.

  The light guide 25 emits light from the light source 21 toward the document P. The light guide 25 is formed of, for example, an acrylic transparent resin material, and is formed in a rod shape that is long in the main scanning direction. The light guide 25 has an incident surface 26 formed at one end in the longitudinal direction. The incident surface 26 is orthogonal to the main scanning direction, and the light from the light source 21 enters. The light guide 25 is formed with an exit surface 27 that emits light incident on the light guide 25 toward the document P on the surface facing the document P. In addition, the light guide 25 is formed with a reflecting surface 28 that propagates light incident from the incident surface 26 in the longitudinal direction of the light guide 25 and reflects the light toward the exit surface 27 on the surface facing the exit surface 27. Is done. The light source 21 is not limited to the above-described configuration as long as it can emit light to the document P. A conventionally known light source such as an LED array can be applied to the light source 21.

  The condenser 30 is an optical member that forms an image of the reflected light from the document P on the image sensor 35. 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 30. The light collecting body 30 is not limited to the above-described configuration as long as it can form an image on the image sensor 35. Conventionally known optical members having various light collecting functions such as various microlens arrays can be applied to the light collecting body 30.

The substrate 40 is formed in a flat plate shape that is long in the main scanning direction. The mounting surface 41 of the substrate 40 is orthogonal to the vertical direction. On the mounting surface 41 of the substrate 40, a light emitting circuit of the light source 21, a driving circuit of the image sensor 35, and the like are mounted.
The image sensor 35 is mounted on the substrate 40 and disposed below the light collector 30. In the image sensor 35, a predetermined number of image sensor ICs 36 each including a plurality of photoelectric conversion elements corresponding to the reading resolution of the image sensor unit 10 are linearly arranged on the mounting surface 41 in the main scanning direction. The image sensor 35 receives light from the original P imaged by the condenser 30 and converts it into an electrical signal.

  The image sensor 35 and the substrate 40 are electrically connected by a wire 37 as a thin metal wire. Between the image sensor 35 and the substrate 40, a signal or the like for each image sensor IC 36 to receive reflected light is input / output via the wire 37. In the present embodiment, a plurality of wires 37 connected to each image sensor IC 36 are drawn out to one side in the sub-scanning direction and connected to each pad 42 disposed on the substrate 40. The image sensor IC 36 and the pad 42 are connected by a wire 37 by wire bonding.

  In the image sensor unit 10 configured as described above, the light source 21 emits light to emit light from the light guide 25 to the lower surface of the document P as shown by an arrow as shown in FIG. Therefore, light is emitted to the original P in a line shape over the reading line O (main scanning direction). This light is reflected by the original P, and the reflected light is imaged on the image sensor 35 via the light collecting body 30. The image sensor 35 can read an image on the lower surface of the document P by converting the formed reflected light into an electric signal.

  When the image sensor 35 reads the reflected 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, and the image is read by the reflected light.

  In the image sensor unit 10 of the present embodiment, when the substrate 40 is fixed to the substrate housing portion 12, the sealing agent S is applied in advance to the lower surface of the inner contact portion 15, and the lower surface of the inner contact portion 15 and the substrate 40. The surface is adhered by contacting the surface with a sealing agent S. At this time, a part of the sealing agent S protrudes from between the lower surface of the inner contact portion 15 and the surface of the substrate 40 and flows out toward the center of the substrate 40 along the surface of the substrate 40. When the sealing agent S comes into contact with the image sensor 35 and the wire 37, the image sensor 35 (the light receiving portion of the image sensor IC 36) may become dirty, the wire 37 may be disconnected, and the quality of reading by the image sensor unit 10 may be deteriorated. There is.

The substrate 40 of this embodiment has a blocking portion that blocks the sealing agent S that has flowed out toward the center of the substrate 40. Hereinafter, the configuration of the damming portion according to the present embodiment will be specifically described with reference to FIGS. 1 and 6.
FIG. 1 is a cross-sectional view showing a state in which the substrate 40 is fixed to the frame 11. FIG. 6 is a plan view taken from the upper side taken along the line II shown in FIG.

  A groove 50 is formed in the substrate 40 as a damming portion. As shown in FIG. 1, the groove 50 is formed between the inner contact portion 15 and the image sensor 35, more specifically, between the inner contact portion 15, the image sensor 35, and the wire 37. Further, as shown in FIG. 6, when viewed from the upper side, the groove 50 is formed inside the inner contact portion 15 and along the region R surrounding the image sensor 35, the wire 37, and the pad 42.

The groove 50 is formed by providing a recess on the surface of the substrate 40. Specifically, the substrate 40 of the present embodiment is formed by laminating a base material 51, a conductor 52, and a resist 53 as shown in FIG. The groove 50 is formed from a conductor 52 having an opening and / or a resist 53 having an opening. Note that FIG. 1 illustrates a case where an opening is formed by not applying a part of the resist 53 in advance. In this embodiment, the resist 53 is provided with an opening as a recess along the region R surrounding the image sensor 35, the wire 37, and the pad 42, thereby forming a rectangular groove 50 when viewed from above.
Note that the groove 50 may be formed by physically removing a part of the conductor 52 and / or a part of the resist 53 or by chemically removing the resist 53 by etching.

  In this way, by forming the groove 50 in the substrate 40, when the lower surface of the inner contact portion 15 and the surface of the substrate 40 are contacted via the sealing agent S, the lower surface of the inner contact portion 15 The sealing agent S that flows out from the surface of the substrate 40 and flows out toward the center of the substrate 40 can be blocked. Specifically, the sealing agent S that has flowed out along the surface of the substrate 40 toward the image sensor 35 and the wire 37 accumulates in the groove 50 and is dammed by the side wall 54 in the groove 50. Therefore, it is possible to suppress the sealing agent S from contacting the image sensor 35 and the wire 37. In addition, since the groove 50 for blocking the sealing agent S flowing out toward the center of the substrate 40 is formed, the inner contact portion 15, the image sensor 35, and the wire 37 can be disposed close to each other. For this reason, since the place where the sealing agent S flowing out from the inner contact portion 15 is retained can be reduced, the frame 11 can be reduced, and the image sensor unit 10 can be reduced in size.

Further, the groove 50 of the present embodiment is formed by providing an opening in a part of the conductor 52 and / or a part of the resist 53 constituting the substrate 40. Therefore, since it is not necessary to install another component on the board 40, the number of components does not increase.
In addition, since the groove 50 of the present embodiment is formed on the entire circumference surrounding the image sensor 35 and the wire 37, the sealing agent S is dammed regardless of the direction from which the groove 50 flows toward the center of the substrate 40. be able to.

(Second Embodiment)
Next, the damming portion of the second embodiment will be described with reference to FIG. 7A.
FIG. 7A is a cross-sectional view showing a damming portion of the second embodiment. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and the description is abbreviate | omitted.
In the substrate 55 of this embodiment, a plurality of grooves 56 as damming portions are formed between the inner contact portion 15 and the wire 37. By forming the plurality of grooves 56 in this manner, the leaked sealing agent S can be blocked by the plurality of grooves 56, so that the sealing agent S can be further suppressed from contacting the image sensor 35 and the wire 37.

(Third embodiment)
Next, the blocking part of 3rd Embodiment is demonstrated with reference to FIG. 7B.
FIG. 7B is a cross-sectional view showing a damming portion of the third embodiment. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and the description is abbreviate | omitted.
In the substrate 57 of this embodiment, a groove 58 wider than the width W of the inner contact portion 15 is formed at a position where the lower surface of the inner contact portion 15 contacts. By forming the groove 58 at the position where the lower surface of the inner contact portion 15 contacts in this way, the sealing agent S accumulates in the groove 58, so that the sealing agent S toward the image sensor 35 and the wire 37 is blocked. Can do.

(Fourth embodiment)
Next, the damming portion of the fourth embodiment will be described with reference to FIG. 7C.
FIG. 7C is a cross-sectional view showing a damming portion of the fourth embodiment. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and the description is abbreviate | omitted.
The substrate 59 of the present embodiment has a protrusion 60 as a damming portion on the substrate 40 between the inner contact portion 15 and the wire 37. The protrusion 60 can be formed by, for example, installing another component different from the substrate 59 on the substrate 59 or silk printing. Since the capacity of the sealing agent S can be easily blocked by increasing the height of the side wall 54 of the projection 60 by making the blocking portion into the projection 60 in this way, the amount of the sealing agent S flowing out increases. Even in this case, the sealing agent S toward the image sensor 35 and the wire 37 can be blocked.

(Fifth embodiment)
Next, the damming portion of the fifth embodiment will be described with reference to FIG. 8A.
FIG. 8A is a plan view showing the damming portion of the fifth embodiment, and corresponds to the cross-sectional view of FIG. 6 described in the first embodiment. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
The groove 62 of this embodiment is formed only on one side of the substrate 61 from which the wire 37 is drawn in the sub-scanning direction. Further, the groove 62 is formed linearly in the main scanning direction longer than the length of the image sensor 35 in the main scanning direction.
The wire 37 is connected to the substrate 40 at a position close to the surface of the substrate 40, and the outflowing sealing agent S is more easily in contact with the light receiving unit of the image sensor 35. Therefore, the groove 62 can be formed only on one side from which the wire 37 is pulled out in the sub-scanning direction, and the sealing agent S toward the wire 37 that is easily contacted can be blocked. On the other hand, since the groove 62 is not formed on the side where the wire 37 is not pulled out, the inner contact portions 15b, 15c, 15d and the image sensor 35 can be arranged closer to each other, so the frame 11 is made smaller accordingly. be able to. A plurality of grooves 62 may be formed as in the second embodiment, and the protrusions 60 described in the fourth embodiment may be provided in place of the grooves 62. In this case, since the protrusion 60 to be formed can be shortened in the fourth embodiment, the cost of the components constituting the protrusion 60 described in the fourth embodiment can be reduced.

(Sixth embodiment)
Next, the blocking part of 6th Embodiment is demonstrated with reference to FIG. 8B.
FIG. 8B is a plan view showing the damming portion of the sixth embodiment, and corresponds to the cross-sectional view of FIG. 6 described in the first embodiment. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and the description is abbreviate | omitted.
A plurality of grooves 64 of the present embodiment are formed only on one side of the substrate 63 from which the wire 37 is drawn in the sub-scanning direction. Each groove 64 is adjacent to a plurality of pads 42 drawn from one image sensor IC 36, and is formed in a straight line in the main scanning direction longer than the length L in the main scanning direction of the plurality of pads 42 combined. The Therefore, when the projection 60 according to the fourth embodiment is installed in place of the groove 64, the projection 60 to be formed can be shortened, so that the cost of components constituting the projection 60 can be further reduced.

(Seventh embodiment)
Next, the blocking part of 7th Embodiment is demonstrated with reference to FIG. 8C.
FIG. 8C is a plan view showing the damming portion of the seventh embodiment, and corresponds to the cross-sectional view of FIG. 6 described in the first embodiment. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, and the description is abbreviate | omitted.
In the substrate 65 of this embodiment, the wires 37 are drawn out on both sides of one side and the other side in the sub-scanning direction and connected to the pads 42 of the substrate 65. The grooves 66 of the present embodiment are formed on both sides of one side and the other side of the substrate 61 from which the wire 37 is drawn in the sub-scanning direction. The groove 66 is preferably formed in a straight line in the main scanning direction longer than the length of the image sensor 35 in the main scanning direction. Thus, even when the wire 37 is pulled out on both sides in the sub-scanning direction, the sealing agent S contacts the image sensor 35 and the wire 37 because the grooves 66 are formed on both sides in the sub-scanning direction. Can be suppressed.
Note that a plurality of grooves 66 may be formed as in the second embodiment, and the protrusions 60 of the fourth embodiment may be provided in place of the grooves 66. In this case, since the protrusions 60 to be formed can be reduced in the fourth embodiment, the cost of the components constituting the protrusions 60 described in the fourth embodiment can be reduced.

As mentioned above, although this invention was demonstrated with embodiment mentioned above, this invention is not limited only to embodiment mentioned above, It can change within the scope of the present invention, and combines embodiment mentioned above timely. Also good.
1 and FIGS. 7A to 7C are diagrams showing openings only in the resist 53. FIG.
Moreover, the opening of the conductor 52 may be provided intermittently according to the position of the conduction part.

  Moreover, although each embodiment mentioned above demonstrated the case where the inner side contact part 15 was formed in the flame | frame 11, it is not restricted to this case. For example, even when the inner contact portion 15 is omitted and the substrate 40 is fixed to the frame 11 having only the outer contact portion 14 via the sealing agent S, the same configuration can be adopted. In this case, for example, by forming a groove 50 between the outer contact portion 14 and the wire 37, it protrudes from between the lower surface of the stepped portion of the outer contact portion 14 and the surface of the substrate 40 to the central portion of the substrate 40. The sealing agent S that has flowed out can be blocked.

  DESCRIPTION OF SYMBOLS 10: Image sensor unit 11: Frame (container) 14: Outer contact part (contact part) 15, 15a-15d: Inner contact part (contact part) 18: Cover glass 20: Light source part 30: Condensing Body 35: Image sensor 37: Wire 40: Substrate 42: Pad 50: Groove (damming portion) 51: Base material 52: Conductor 53: Resist 54: Side wall 55: Substrate 56: Groove (damming portion) 57: Substrate 58 : Groove (damming portion) 59: Substrate 60: Protrusion (damming portion) 61: Substrate 62: Groove (damming portion) 63: Substrate 64: Groove (damming portion) 65: Substrate 66: Groove (damming portion) 100: MFP (image reading apparatus, image forming apparatus) 102: Image reading unit 113: Image forming unit P: Document (reading object) S: Sealing agent

Claims (7)

A condenser for imaging light from the object to be read;
An image sensor that receives light imaged by the light collector and converts it into an electrical signal;
A substrate on which the image sensor is mounted;
A wire connected to the substrate from the image sensor;
An image sensor unit that contains the light collector and a container that fixes the substrate via a sealing agent;
The container has a contact portion that is in contact with the surface of the substrate via the sealing agent;
The substrate includes a blocking portion formed between the contact portion and the image sensor and the wire, thereby blocking the sealing agent flowing out toward a central portion of the substrate. Image sensor unit.   The image sensor unit according to claim 1, wherein the damming portion is a groove formed in the substrate. The substrate is formed by laminating a base material, a conductor and a resist,
The image sensor unit according to claim 2, wherein the groove is formed by not providing a part of the conductor and / or a part of the resist.   The image sensor unit according to claim 2, wherein the groove is formed on an entire circumference surrounding the image sensor and the wire.   The image sensor unit according to claim 4, wherein the groove is formed below the contact portion. The image sensor unit according to any one of claims 1 to 5,
A moving unit that relatively moves the image sensor unit and the reading object;
An image reading apparatus comprising: The image sensor unit according to any one of claims 1 to 5,
A moving unit that relatively moves the image sensor unit and the reading object;
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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