JPH06164829A - Image sensor - Google Patents

Abstract

PURPOSE:To make the optical characteristic stable by strengthening the adhesion of a lens array being a component of an optical system of the image scanner. CONSTITUTION:A light source array 7 emitting a read original 1 and a lens array 8 collecting a reflected light from the original 1 are provided in a chassis 2A, and inner wall of the chassis 2A or the lens array 8 has two projections 2A1, 2A2 along a contact face in the lengthwise direction and an adhesives 10 is immersed along the projections 2A1, 2A2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image scanner device, and more particularly to an image scanner device in which a lens array constituting an optical system is firmly adhered to stabilize optical characteristics.

[0002]

2. Description of the Related Art FIG. 4A is a sectional view showing the internal structure of a conventional image scanner device, and FIG. 4B is an enlarged view showing a part of it. In the figure, reference numeral 1 denotes a document as a subject whose characters and the like are read by an image scanner device which moves in the Y direction. Reference numeral 2 denotes a housing that houses optical systems such as a light source array and a lens array, which will be described later, for example, a chassis made of aluminum, 3 a light receiving sensor for receiving an optical signal extracted from the optical system, 4 a light receiving sensor 3, and A light blocking cover 5 for blocking light from the outside is an image signal output circuit for outputting a signal from the light receiving sensor 3 as an image signal.

Inside the chassis 2, a dust-proof cover 6 made of transparent glass is arranged in the lower part of the chassis 2 so as to face the original 1.
And a light source array 7 which is disposed above the dustproof cover 6 and is spaced apart therefrom and which irradiates the original 1 with light through the dustproof cover 6.
And a lens array 8 that collects the reflected light from the original 1.
An elastic body, such as a spring 9, is provided for pressing the lens array 8 against the inner wall of the chassis 2.

In the light source array 7, a plurality of light emitting elements such as LEDs are arranged in a line in the width direction of the document 1 or the longitudinal direction (sub scanning direction). The lens array 8 is, for example, a converging rod lens array, which is arranged in the longitudinal direction in parallel with the light source array 7. The light receiving sensor 3 arranged directly above the lens array 8 is also arranged in the longitudinal direction. As shown in the enlarged view of FIG. 4B, the lens array 8 is fixed by an adhesive 10 while being pressed against the inner wall of the chassis 2 by a spring 9.

Next, the operation of the conventional image scanner apparatus and the method of adjusting the mounting of the lens array 8 will be described. The image scanner device irradiates the document 1 with light from the light source array 7 through the dustproof cover 6 while relatively moving on the document 1 in the Y direction (main scanning direction). The reflected light from the document 1 is again received by the lens array 8 through the dustproof cover 6 as optical information such as characters in the document 1 and is imaged by the light receiving sensor 3 directly above the lens array 8.
The light receiving sensor 3 converts the received optical information into an electric signal and outputs the electric signal to the image signal output circuit 5, and the image signal output circuit 5 further converts an analog signal corresponding to an image such as a character into a digital signal. To the outside.

When mounting the lens array 8 together with the light source array 6 inside the chassis 2, a spring 9 is used to mount the lens array 8.
While moving the lens array 8 pressed against the inner wall of the lens in the vertical direction, the position of the lens array 8 is adjusted so that the focus of the optical information of the image of a character or the like matches the light receiving sensor 3, and the lens array 8 is bonded when the optimum position is determined. The agent 10 is applied to the end surface of the lens array 8 on the contact portion with the inner wall of the chassis 2 and permeates the contact surface.

[0007]

As described above, in the conventional image scanner device, when the lens array 8 is fixed to the inner wall of the chassis 2 with an adhesive, the contact portion between the end surface of the lens array 8 and the inner wall of the chassis 2 is contacted. However, if the lens array 8 and the inner wall of the chassis 2 are in close contact with each other, the gap between the two is small and the adhesive does not sufficiently penetrate in the longitudinal direction (backward direction in the drawing). Array 8 chassis 2
The adhesion strength to Therefore, the lens array 8 is displaced from the position adjusted by a slight external force, and the light receiving sensor 3
There is a problem in that the focus of the optical information received at is out of focus.

The present invention has been made to solve the above problems, and enhances the degree of fixation of the lens array,
An object is to obtain an image scanner device capable of stabilizing optical characteristics.

[0009]

According to a first aspect of the present invention, there is provided an image scanner device in which a light source array for irradiating a document surface for reading and a lens array for condensing reflected light from the document surface are provided in a housing. And the housing or the lens array has at least two convex portions along the longitudinal direction on the surfaces in contact with each other.

An image scanner device according to a second aspect of the present invention comprises a light source array for irradiating a document surface for reading and a lens array for condensing reflected light from the document surface, in the housing. Alternatively, the lens array has at least one groove along the longitudinal direction on the surfaces contacting each other.

[0011]

In the image scanner device according to the invention of claim 1, the adhesive is poured into a gap formed in the longitudinal direction between the lens array and the wall surface of the housing by the convex portion, so that a large amount of the adhesive passes through the gap and the lens passes through the gap. Penetrates in the longitudinal direction of the array and enhances the adhesive strength.

In the image scanner device according to the second aspect of the invention, the adhesive is injected into the groove formed in the longitudinal direction between the lens array and the wall surface of the housing, so that the adhesive penetrates deeply in the longitudinal direction and the capillary phenomenon. As a result, the adhesive portion can be secured over a wide area by penetrating in the width direction of the lens array.

[0013]

EXAMPLES Example 1. Next, an image scanner device according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1A is a sectional view showing the internal structure of the image scanner apparatus of this embodiment. In the figure, the same reference numerals as those in FIG. 4A indicate the same or corresponding portions. In the figure, 2A is a housing for housing the optical system, for example, a chassis made of aluminum. The chassis 2A has, for example, two convex portions 2A1 and 2A2 having the same sectional shape in the longitudinal direction on the contact surface with the lens array 8. Each convex portion 2
A1 and A2 are formed at the same time when the chassis 2A is formed by an extrusion mold, so that they are all formed as convex portions having the same cross-sectional shape in the extrusion direction, that is, the longitudinal direction.

FIG. 1B is an enlarged view showing a contact surface between the lens array 8 and the chassis 2A. As is clear from the figure,
The lens array 8 is pressed by the spring 9, and the convex portions 2A1 and 2A
Pressed on 2. Then, when the adhesive 10 is injected into the gap formed on the wall surface of the chassis 2A and the back surface of the lens array 8, the adhesive 10 penetrates in the longitudinal direction along the convex portions 2A1 and 2A2, and the lens array 8 is inserted into the wall surface of the chassis 2A. Glue to.

In the first embodiment, the convex portions are 2A1 and 2A.
The case of having two and two was explained, but the convex portions 2A1 and 2A2
May be three or more. Furthermore, the convex portion 2A
Instead of having the chassis 2A, the lenses 1 and 2A2 may have at least two lens arrays 8 on the contact surface with the inner wall of the chassis 2A.

Example 2. FIG. 2A is a sectional view showing the internal structure of the image scanner device of this embodiment. Figure 4A
The same reference numerals as in FIG. In the figure, 8
Reference numeral A is a lens array that collects the reflected light from the document 1 on the light receiving sensor 3 in the light shielding cover 4. Lens array 8
A is the longitudinal direction on the contact surface with the wall surface of the chassis 2,
For example, it has one groove 8A1.

FIG. 2B is an enlarged view showing a contact surface between the lens array 8A and the wall surface of the chassis 2. As is clear from the figure, the lens array 8A comes into close contact with the inner wall of the chassis 2 when pressed by the spring 9. When the adhesive 10 is injected from the groove 8A1 in this state, the adhesive 10 permeates in the longitudinal direction along the groove 8A1 and also spreads over the entire contact portion between the lens array 8A and the wall surface of the chassis 2 due to the capillary phenomenon to achieve strong adhesion. Can be secured.

In the present embodiment, the lens array 8A has one groove 8A1 on the contact surface with the wall surface of the chassis 2, but it may have two or more grooves 8A1.
Furthermore, one or more grooves 8A1 may be provided on the wall surface of the chassis 2 on the contact surface with the lens array 8A.

Example 3. FIG. 3 is a sectional view showing the internal structure of the image scanner device of this embodiment. In the figure, the same reference numerals as those in FIG. 4A indicate the same or corresponding portions. In the figure, 2B
Is a housing for housing the optical system, for example, a chassis made of aluminum. The chassis 2B has grooves 2B1, 2B2, 2B3 in the longitudinal direction on the contact surface with the dustproof cover 6, the contact surface with the light source array 7, and the contact surface with the light shielding cover 4, respectively. The grooves 2B1, 2B2, and 2B3 are molded at the same time when the chassis 2B is molded by an extrusion mold, so that the grooves 2B having the same cross-sectional shape in the extrusion direction, that is, the longitudinal direction.
1, 2B2, 2B3 are formed.

Thus, the groove 2 is formed in the longitudinal direction of the chassis 2B.
By molding B1, B2, 2B3, chassis 2B
With the dust-proof cover 6, the light source array 7, and the light-shielding cover 4 arranged at appropriate positions inside, the respective grooves 2B1, 2B2, 2B
When the adhesive is injected into the groove 3, the adhesive will be injected into the grooves 2B1 and 2B.
While penetrating in the longitudinal direction along 2, 2B3, it can be spread to the whole of the close contact portion between the chassis 2B and each arrangement by the capillary phenomenon, and a strong adhesion can be secured.

The chassis 2B has grooves 3B at the above-mentioned three locations.
Although 1, 2B2 and 2B3 are molded, a groove may be molded in a portion other than these portions which is in contact with the lens array 8. As a result, the optical characteristics are stable as in the first and second embodiments. Further, in the chassis 2B, the grooves 2B1, 2B2,
The locations where 2B3 is molded are not limited to all the above three locations, and any one location or two locations may be used as required, and the present embodiment may be applied to the first and second embodiments.

[0022]

According to the first aspect of the present invention, the housing is provided with a light source array for irradiating a reading original surface and a lens array for collecting reflected light from the original surface. The lens array has at least two convex portions along the longitudinal direction on the surfaces contacting each other, and the adhesive is allowed to penetrate along these convex portions to spread the adhesive along the longitudinal direction along the convex portions. It becomes possible to pour a large amount of adhesive,
Since a strong adhesive portion can be secured over a wide area, it is possible to prevent the adjustment position of the lens array from being displaced by an external force, and to stabilize optical characteristics.

According to the second aspect of the invention, the housing or the lens is provided with a light source array for irradiating the reading original surface and a lens array for condensing the reflected light from the original surface. The array has at least one or more grooves along the longitudinal direction on the surfaces contacting each other, and by allowing the adhesive to penetrate along the grooves, the adhesive penetrates along the grooves in the longitudinal direction, and Due to the capillary phenomenon, the adhesive spreads over the entire contact area between the lens array and the housing wall surface, and a small amount of adhesive can secure a strong adhesive area over a large area, preventing the lens array adjustment position from shifting due to external force. This has the effect of stabilizing the optical characteristics.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an internal structure of an image sensor device according to a first embodiment of the invention and an enlarged view of a part thereof.

FIG. 2 is a sectional view showing an internal structure of an image sensor device according to a second embodiment of the invention and an enlarged view of a part thereof.

FIG. 3 is a sectional view showing an internal structure of an image sensor device according to a third embodiment of the invention.

FIG. 4 is a cross-sectional view showing an internal configuration of a conventional image sensor device and an enlarged view of a part thereof.

[Explanation of symbols]

 1 Manuscript 2, 2A, 2B Chassis 2A1, 2A Convex part 3 Light receiving sensor 7 Light source array 8, 8A Lens array 8A1 Groove

Claims (2)

[Claims] 1. A housing is provided with a light source array for irradiating an original surface for reading and a lens array for condensing reflected light from the original surface, and the housing or the lens array is in contact with each other. An image scanner device having at least two convex portions along the longitudinal direction, and an adhesive agent permeating along these convex portions. 2. A housing is provided with a light source array for irradiating a document surface for reading, and a lens array for condensing reflected light from the document surface, and the housing or the lens array is in contact with each other. An image scanner device having at least one groove along the longitudinal direction, and an adhesive agent permeating along the groove.