JPH0583469A - Image sensor - Google Patents

Abstract

PURPOSE:To resolve problems to be generated by fitting a glass cover to a frame while using an adhesive agent. CONSTITUTION:The upper part of a frame 1 and a glass cover 2 are formed in complementary shapes so as to be fitted each other, the glass cover 2 is inserted to the upper part of the frame 1 and in the frame 1, a substrate 5 equipped with a light emitting element 3 and a light receiving element 4 is fixed to the lower part of the frame 1. Then, a rod lens array 6 for condensing reflected light from an original is obliquely arranged so as to obtain the inclined angle of the optical axis to the face of the glass cover 2. Therefore, light from the light emitting element 3 is almost vertically made incident to the original on the glass cover 2, and the reflected light from the original is condensed by the rod lens array 6, received by the light receiving element 4 and converted to electric signals.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image sensor used in facsimiles, optical character readers and the like.

[0002]

2. Description of the Related Art FIG. 6 shows an upper side of a frame of a conventional general image sensor. A transparent cover (glass cover) 31 is attached to the upper portion of the frame 30, and the light emitting element 3
A substrate 33 having 2 is fixed to the frame 30 with an inclination angle with respect to the surface of the glass cover 31. A spherical plastic lens 34 is provided on the optical path of the light emitting element 32.
Is arranged, and a rod lens array 35, which is an optical system for collecting reflected light from a document (not shown) serving as an imaging target on the glass cover 31, has a frame 30 with respect to the surface of the glass cover 31. It is fixed vertically.

In such an image sensor, the light emitted from the light emitting element 32 passes through the plastic lens 34 and is applied to the original on the glass cover 31 at an angle of about 45 degrees with respect to the glass cover 31. The light reflected perpendicularly to the glass cover 31 by the original is reflected by the rod lens array 35.
The light is collected by, and is received by a light receiving element (not shown) located directly below and converted into an electric signal.

[0004]

The glass cover 31 is attached to the frame 30 by the contact surface between the frame 30 and the glass cover 31, that is, the upper surface 3 of the frame 30.
0a, 30b and the lower surfaces 31a, 31b in the lengthwise direction of the glass cover 31 are generally fixed to each other with an adhesive.

However, if the adhesive is used for fixing, the adhesive is apt to adhere to the glass cover 31 at the time of adhesion,
In particular, when a large amount of adhesive is used, excess adhesive sticks out inside the glass cover 31, which adversely affects the light detection characteristics of the light receiving element. Also, the use of the adhesive is disadvantageous in increasing the productivity of the image sensor because it cannot move to the next manufacturing process until the adhesive is dried.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an image sensor capable of preventing the adverse effect on the light receiving element caused by mounting using an adhesive and improving the productivity.

[0007]

In order to achieve the above-mentioned object, the image sensor of the present invention is the same as the conventional image sensor described above, so that the transparent cover and the transparent cover can be fitted to the frame. It is characterized in that the part of the frame to be attached is complemented. With this configuration, since the transparent cover is fitted and fixed to the frame, no adhesive is required, and the above problems are solved.

[0008]

EXAMPLES The image sensor of the present invention will be described below based on examples. FIG. 1 shows a side view of the embodiment.
In this image sensor, a transparent cover (glass cover) 2 is attached to the top of a frame 1. Glass cover 2
Is obtained by chamfering two ridge lines in the longitudinal direction of a plate glass having a rectangular cross section, and an upper portion of the frame 1 is formed in a complementary shape corresponding to the chamfered shape. In the frame 1, a substrate 5 having a light emitting element (LED chip or the like) 3 and a light receiving element (photodiode chip or the like) 4,
A rod lens array 6, which is an optical system for collecting reflected light from a document (not shown) on the glass cover 2, is arranged. Further, at three positions on both ends of the frame 1, circular cutouts 1a, 1 for mounting side plates (described later) are provided.
b, 1c are formed.

The substrate 5 is pressed and fixed to the inner wall of the frame 1 by a U-shaped curved spring 7 provided in the lower portion of the frame 1. The rod lens array 6 is obliquely arranged so that its optical axis has an inclination angle with respect to the surface of the glass cover 2, and is pressed and fixed to the inner wall of the frame 1 by the lens retainer 8. A light reflecting plate 9 for efficiently guiding the light from the light emitting element 3 to the document is provided in the frame 1, and the surface of the lens holder 8 facing the light reflecting plate 9 also has a function of reflecting the light. To have.

In this image sensor, the light emitting element 3 is located directly below the glass cover 2, and the light receiving element 4 is located on the optical axis of the rod lens array 6. Therefore, the light emitted from the light emitting element 3 is vertically incident on the document on the glass cover 2,
The reflected light from the document is collected by the rod lens array 6, received by the light receiving element 4, and converted into an electric signal. As shown in FIG. 4, the glass cover 2 is attached to the frame 1 by inserting the glass cover 2 into the upper portion of the frame 1 from one end of the frame 1 and fitting the same. Since the glass cover 2 and the upper portion of the frame 1 are complementary, the glass cover 2 can be easily inserted. Further, by inserting the glass cover 2, an additional effect that the distortion of the frame 1 can be corrected can be obtained.

FIG. 2 shows a state in which the glass cover 2 is attached to the frame 1. Although the image sensor is completed as it is, the side plates are actually attached to both ends of the frame 1 as shown in FIG. The side plate 10 has the same shape as the side surface of the frame 1 and has substantially the same size as the outline, and has pins 10a, 10b, 10c for inserting into the notches 1a, 1b, 1c of the frame 1, respectively. Connect these pins 10a, 10b, 10c to the frame 1
Both ends of the frame 1 are closed by inserting them into the cutouts 1a, 1b, 1c, and the glass cover 2 is securely fixed (see FIG. 3).

Since the glass cover 2 is inserted into the frame 1 and fitted therein, when the glass cover 2 is attached to the frame 1, the glass cover 2 is somewhat loose. However, since the glass cover 2 is pressed against the frame 1 by the platen roller when the image sensor is actually used by incorporating it in an electronic device such as a facsimile,
The rattling of the glass cover 2 is not a problem. Further, the side plate 10 may be attached by using pins, or may be adhered or screwed.

[0013]

As described above, the image sensor of the present invention has the following effects because the transparent cover and the frame portion to which the transparent cover is attached are complementary. (1) Since the transparent cover is attached to the frame without using an adhesive, the light detection characteristics of the light receiving section are not hindered. (2) Since no adhesive is used, after the transparent cover is attached to the frame, it is possible to immediately shift to the next manufacturing process, which improves productivity. (3) Since the transparent cover is inserted and fitted into the frame, distortion of the frame can be corrected.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of an image sensor of the present invention.

FIG. 2 is a side view showing a state in which a transparent cover is attached to the frame in the image sensor of FIG.

3 is a side view showing a state in which a side plate is attached to an end of a frame in the image sensor of FIG.

FIG. 4 is a partially omitted perspective view showing a state in which a transparent cover is inserted into a frame.

FIG. 5 is a partially omitted perspective view showing a state in which a side plate is attached to an end of a frame.

FIG. 6 is a partially omitted side view showing an upper side of an image sensor according to a conventional example.

[Explanation of symbols]

 1 frame 2 glass cover (transparent cover) 3 light emitting element 4 light receiving element 6 rod lens array (optical system) 10 side plate

Claims (2)

[Claims] 1. A transparent cover on which an object to be imaged is mounted is attached to a frame, and a light emitting unit for irradiating the object to be imaged with light and an optical for condensing reflected light from the object to be imaged in the frame. In an image sensor including a system and a light receiving section for receiving light from an optical system, a transparent cover and a frame portion to which the transparent cover is attached are supplemented so that the transparent cover can be fitted to the frame. Image sensor characterized by being shaped. 2. The image sensor according to claim 1, wherein side plates are attached to both ends of the frame.