JPH05145697A - Image sensor - Google Patents

Abstract

PURPOSE:To prevent invasion of an adhesive used for assembling onto a case by forming a groove on an adhesive face when a cover glass and a frame are used to form the case. CONSTITUTION:The case is made up of a 1st frame 1, a 2nd frame 2 and a cover glass 3. A light receiving element array 4 arranged linearly for photoelectric conversion, an optical system 6 forming an image of an original read position 5A through a slit 9 to the light receiving element array 4 and a light source 7 for emitting the read position 5A are arranged respectively to the case, and the image of the read position 5A of the original 5 is formed onto the light receiving element 4 through the slit 9 via the optical system 6, in which photoelectric conversion is implemented. When the frame and the cover form the case, since a groove is formed to the adhesive face of both the members, the adhesives going to flow to the inside of the case flows to the groove and does not enter the inside of the case and the adhesion of both the members is more strengthened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image sensor suitable for use in an image information processing device or the like.

[0002]

2. Description of the Related Art A conventional so-called contact type image sensor has a structure in which a housing is first
It is composed of a frame 1, a second frame 2 and a cover glass 3. The first frame 1 is 2 with respect to the longitudinal direction of the side surface.
The space portion is provided so as to be divided, and the first space portion 1A
An optical system (imaging element array, for example, a short focus gradient index rod lens array) 6 for forming an image of the reading position 5A of the original 5 on the cover glass 3 is fixed to the light receiving element array 4. ing.

A second space 1B is provided beside the first space 1A (on the left side in FIG. 4), and a light source 7 for irradiating the reading position 5A of the original 5 is attached to the second space 1B. .. The light 8 of the light source 7 must accurately illuminate the reading position 5A of the original 5 placed on the cover glass 3, and therefore the second space 1B is provided with an inclined portion,
By mounting the light source 7 using this inclination, the light source 7
Light 8 illuminates the reading position 5A.

Between the optical system 6 and the light receiving element array 4,
A slit 9 which is an optical path is formed by hollowing out the first frame 1. Therefore, the image of the reading position 5A of the document 5 illuminated by the light 8 of the light source 7 is received by the slit 9 through the optical system 6. An image is formed on the element array 4, and photoelectric conversion is performed here.

On the other hand, the light receiving element array 4 is provided on the substrate 10 for transmitting an electric signal at a position where the image of the document reading position 5A is accurately formed through the slit 9, and the light receiving element 4 and the substrate 10 are provided. Is held in the third space 1C of the first frame 1 provided below the slit 9 and is supported by the second frame 2.

As for the housing of the image sensor, the cover glass 3 and the first frame 1 are fixed by the adhesive surfaces 11A and 11B with an adhesive, and the first frame 1 and the second frame 2 are fixed. The connecting member 12 causes the first frame 1 and the connecting member 12 to move to the second frame 2
The image is formed in a manner of sandwiching. Reference numeral 13 is a groove for fitting margin of the cover glass 3 provided adjacent to the corner bonding surfaces 11A and 11B of the first frame 1.

[0007]

However, in the image sensor having such a conventional structure, when the first frame 1 and the cover glass 3 constituting the housing are fixed by the adhesive surfaces 11A and 11B with an adhesive, The adhesive may flow into the housing before it has completely solidified. Then, the light source 7
The light 8 further incident and reflected at the document reading position 5A is reflected and refracted by the inflowing adhesive to cause a problem that the image at the document reading position cannot be accurately formed on the light receiving portion of the light receiving element array 4. ing.

Further, since the adhesive surfaces 11A and 11B between the first frame 1 and the cover glass 3 are provided with the grooves 13 for fitting margins provided adjacent to the adhesive surfaces 11A and 11B, it is possible to prevent the inflow of the adhesive to some extent. However, apart from this, dust that floats outside is taken into the inside of the housing through this gap, which also causes diffuse reflection and has an adverse effect on image formation similar to the inflow adhesive.

An object of the present invention is to solve the problems caused by the conventional structure and to provide an image sensor in which an adhesive or dust does not enter the housing.

[0010]

In order to achieve the above object, the present invention provides a light receiving element for performing photoelectric conversion, an optical system for forming an image of a reading position of an original through a slit in the light receiving element, and the original. A light source for irradiating the reading position, a cover glass in contact with the original document, and a frame to which each member is attached and which constitutes a casing together with the cover glass, and are provided on an adhesive surface between the cover glass and the frame. A groove is formed.

[0011]

According to the present invention, when the frame and the cover glass form a casing, a groove is formed on the bonding surface of both members. Not only does it flow into the housing, but also the two members become more firmly bonded.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The image sensor of the present invention will be described below based on the embodiments shown in the drawings. The same members as those of the conventional technique are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 1 and FIG. 2 show a first embodiment of the present invention, in which a housing is composed of a first frame 1, a second frame 2 and a cover glass 3. In the housing, a light receiving element array 4 arranged linearly for photoelectric conversion,
An optical system (short focus coupling element array) 6 for forming an image of the document reading position 5A through the slit 9 in the light receiving element array 4 and a light source (LED unit) 7 for irradiating the reading position 5A are respectively provided. The image of the reading position 5A of the document 5 which is arranged and illuminated by the light 8 of the light source 7 passes through the optical system 6, the slit 9, and the light receiving element 4
An image is formed on the above, and photoelectric conversion is performed here.

The first frame 1 and the cover glass 3 are adhered to each other by applying an adhesive to the adhering surface, but in the present embodiment, both the adhering surfaces 11A and 11B on the first frame 1 and the longitudinal direction. Grooves 14 are formed over the entire length in the direction to prevent the adhesive before solidification from entering the inside of the housing.

FIG. 3 shows a second embodiment of the present invention. Unlike the first embodiment, the groove 14 is provided only on one of the adhesive surfaces 11A, 11B on the first frame 1 11A. Has been formed. Moreover, as the groove 14, the adhesive surface 11A closer to the optical path of the first frame 1 is selected. Therefore, in this embodiment, the adhesive surface 11B without the groove 14 is provided.
Although there is a possibility that the adhesive before being solidified from the inside of the housing may enter into the housing, since it is at a position relatively far from the optical path 8, the influence on the image reading due to the inflow of the adhesive is negligible. Further, by not providing the groove 14, the adhesive surface 11B
Since the width of the device can be reduced, it can also contribute to downsizing of the device.

In the above two embodiments, the groove 1
Although the case where 4 is formed over the entire length in the longitudinal direction has been described, the groove 14 is formed on the bonding surface 11A, 11B of the first frame 1.
The purpose of forming is to prevent excess adhesive from entering the housing during bonding and to reliably absorb it in the groove 14. Therefore, it is not necessary to provide the groove 14 over the entire length in the longitudinal direction, and the shape, depth, position, etc. can be appropriately selected from the viewpoint of preventing the intrusion of the adhesive.

[0017]

As described above in detail with reference to the embodiments, according to the present invention, when the cover glass and the frame constitute the casing, the groove is formed on the bonding surface thereof. Therefore, it is possible to prevent the adhesive used during assembly from entering the housing.

Further, as a result of the formation of the groove, it is possible to prevent the adhesive from entering the housing, and as a result, it is also possible to prevent dust floating outside from entering the housing through the gap.

Therefore, regarding the reading of the document, the image at the document reading position can be accurately formed on the light receiving element without being affected by the reflection and refraction by the adhesive flowing into the housing and the diffuse reflection by the invaded dust. Therefore, a clear read image can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing a first embodiment of the present invention.

FIG. 2 is a top view showing the first embodiment of the present invention.

FIG. 3 is a sectional view showing a second embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a conventional structure.

[Explanation of symbols]

 1 1st frame 2 2nd frame 3 Cover glass 4 Light receiving element array 5 Original 5A Original reading position 6 Optical system (imaging element array) 7 Light source 9 Slits 11A, 11B Bonding surface 14 Groove

Claims (1)

[Claims] 1. A light receiving element for performing photoelectric conversion, an optical system for forming an image at a reading position of an original through a slit in the light receiving element, a light source for irradiating the reading position of the original, and a cover glass in contact with the original. And a frame to which each member is attached and which constitutes a casing together with the cover glass, and a groove is formed in an adhesive surface between the cover glass and the frame.