JPH06276363A - Original reader - Google Patents

Abstract

PURPOSE:To improve the job performance for unit processing by reducing number of components possibly, simplifying the structure to attain low cost and facilitating or eliminating the need for adjustment. CONSTITUTION:In the original reader having a sensor array 1 provided with a light source 2 and plural photoelectric conversion elements 1-1 and having a support to support them integrally, the sensor array 1 having the plural photoelectric conversion elements is contained in a fluorescent display tube 2-0. The fluorescent display tube 2-0 being the light source is made up of a cathode electrode 2-1, a grid electrode 22, a fluorescent material 2-3, an anode electrode 2-4, a wire 2-5 interconnecting them and an insulation layer 2-6, and the close contact type image sensor in which an original read function is contained in the fluorescent display tube is formed by containing them in a vacuum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document reading apparatus which can be used in facsimiles, copying machines, scanners and the like.

[0002]

2. Description of the Related Art A contact type that uses a sensor array as a document reading device that can be used in facsimiles, copiers, scanners, etc., forms a read image in a one-to-one manner, and reads it in the same size as the read document. Image sensors have already been proposed.

This contact type image sensor is, for example,
As shown in FIG. 5, a sensor array 1, a light source 2, a cover glass 3 for holding a moving document, and a frame 4-
1 and 4-2 and other parts, and these members are housed inside the frame to form a unit.
Here, a converging fiber lens array or a short-focus imaging element array 5 for forming a one-to-one read image is further incorporated. In the figure, reference numeral 1-1
Is a sensor, 1-2 is a sensor board on which the sensor 1-1 is mounted, and the two constitute the sensor array 1, and the reference numeral 2-3 is a base that constitutes a part of the light source 2. Reference numeral 2-7 is a light guide body that similarly guides light from the light source 2.

[0004]

However, in such a document reading apparatus, in addition to the sensor array 1 and the light source 2, the cover glass 3 for holding the moving document and other parts are provided in the frame 4-1. , 4-
Since it is structured to be stored in 2, there are many parts,
It has a complicated structure, and when these members are housed inside the frame, adjustment work such as positioning is troublesome, and a jig and tool for holding them are required, which results in poor workability.

When a converging fiber lens array or a short focus imaging element array is used as an optical means for forming a read image in a one-to-one manner, the lens thickness which is the dimension in the optical axis direction is large, Further, the outer diameter dimension of the contact image sensor determines the outer diameter dimension of the contact image sensor as it is, which is an obstacle to downsizing. Further, since the cover glass 3 for holding the moving document and the frames 4-1 and 4-2 are composed of separate members, the number of parts is increased and the cover glass 3 is fixed to the uppermost part of the frame. Means were needed. There is also a problem that impurities enter between the converging fiber lens array 5 and the sensor array 1 to cause an image error and adversely affect the sensor output.

[0006]

SUMMARY OF THE INVENTION The present invention has been made based on the above-mentioned circumstances. The number of parts is reduced as much as possible, the structure is simplified, the cost is reduced, and the adjustment work is facilitated. It is an object of the present invention to provide a document reading device which is unnecessary and has a structure in which workability in unitization is improved.

[0007]

Therefore, in the present invention,
In a document reading apparatus having a light source, a sensor array having a plurality of photoelectric conversion elements, and a support for integrally supporting them, a sensor array having a plurality of photoelectric conversion elements is housed in a fluorescent display tube. It is characterized by having done.

Further, according to the present invention, there is provided an original reading apparatus having a light source, a short-focus imaging element array, a sensor array having a plurality of photoelectric conversion elements, and a support body for integrally supporting them. A fiber array is used as the short-focus image forming element array, the fiber array is also used as a cover glass for holding a moving original, and this is integrally formed with a frame for holding each member inside.

Further, according to the present invention, a document reading having a light source, a short-focus imaging element array, a sensor array having a plurality of photoelectric conversion elements, and a support for integrally supporting them is provided. The apparatus is characterized in that a microlens array is used as the short-focus image forming element array, and the microlens array is bonded to a cover glass holding a moving document with an optical adhesive resin.

Further, according to the present invention, a document reading further includes a light source, a short-focus imaging element array, a sensor array having a plurality of photoelectric conversion elements, and a support body for integrally supporting them. In the apparatus, the light source is mounted on a substrate of a sensor array including a plurality of photoelectric conversion elements, and a lens for guiding a light flux of the light source is provided at a document reading position.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first embodiment which best represents the features of the present invention. In this embodiment, the display surface glass 3 of the fluorescent display tube 2-0 is used as a cover glass, and the original is conveyed above the cover glass, and the sensor 1-1 is provided on the inner surface of the display surface glass 3. Are mounted using gold bumps 1-3, etc., to form the sensor array 1. Here, a transparent electrode 1-6 or the like is provided on the inner surface of the display surface glass 3 to electrically connect them, and these are connected via a conductive material 1-4 or the like to a lead frame (external connection) of the fluorescent display tube. Terminal) 6.

The fluorescent display tube 2-0 includes a sensor 1-1.
Wiring of the transparent electrodes 1-6 is performed on the entire inner surface of the display surface glass 3 of the fluorescent display tube in a region that is not involved in the wiring, and is used as a shield of the display tube. With the above configuration, the fluorescent display tube does not generate impure gas and does not hinder the function as a light source.

The fluorescent display tube 2-0, which is a light source, includes a cathode electrode 2-1, a grid electrode 2-2, and a phosphor 2-3.
And the anode electrode 2-4 and the wiring 2- that connects them.
5 and an insulating layer 2-6, which are vacuumized, are systematized as a contact-type image sensor in which a document reading function is housed in a fluorescent display tube, which reduces the number of parts and simplifies the structure. Achieved, and easy to adjust the mounting position when storing the member inside the frame,
Alternatively, it is possible to obtain an effect that it is not necessary and that a jig or tool for holding them is not needed.

In the second embodiment shown in FIG. 2, a fiber array 5 is arranged in place of the above-mentioned converging fiber lens array for forming a read image on a one-to-one basis, and the outer diameter of the contact type image sensor is set. It has been successfully downsized and downsized.

The fiber array 5 has a wire diameter of 1
High-performance large-scale image transmission where hundreds of thousands to millions of 0-25 μm multi-component optical glass fibers are arranged between base glass materials, heated and pressure-bonded, and processed into plates. It is constructed in the form of plate glass 5-0. A structure in which the sensor array 1 having a plurality of photoelectric conversion elements is brought into close contact with the fiber array 5 to form a read image on a one-to-one basis is adopted as the document reading apparatus of the present invention. The photoelectric conversion element is a gold wire or the like, and can be connected using a conventional wire bonding device. In addition, the sensor array 1 is provided with a sensor alignment board 1-5.
It is held by the sensor substrate 1-2.

The transmission plate glass 5-0 is
It is used as a cover glass for holding a moving original and is integrally formed with the frame 4 for holding each member inside, so that the number of parts is reduced. Further, as a result, no assembly jig is required, and adjustment work is easy or unnecessary, and the effect of fixing the cover glass to the top of the frame can be obtained without performing special assembly work. it can.

A third embodiment of the present invention is shown in FIG. 3, in which a microlens array is used instead of the above-mentioned converging fiber lens array for forming a read image on a one-to-one basis. 5 has been arranged to reduce the outer diameter of the contact image sensor and succeed in downsizing.

The microlens array 5 is formed by forming a lens array in which a glass portion which is not exposed by ultraviolet exposure has a spherical shape by using a photographic processing process for special glass. In addition, the microlens array 5
And a back surface of the cover glass 3 for holding the moving original are joined with an optical adhesive resin (not shown), thereby eliminating the need for parts such as screws for fixing the lens and preventing the generation of impurities due to the fixing work. be able to. An ultraviolet curing type is used as the optical adhesive resin.

Further, since the cover glass 3 is formed integrally with the frame 4-0 holding each member therein,
The number of parts can be reduced. Also, with such a configuration, adjustment work such as positioning when unitizing is made easy,
Alternatively, the cover glass can be fixed to the uppermost portion of the frame without any need for a jig for assembling and without any special assembling work.

Further, between the microlens array 5 and the sensor array 1 having a plurality of photoelectric conversion elements, a transparent member 7 such as optical glass is provided so as to prevent impurities from invading there. Are arranged with the above-mentioned UV-curable optical adhesive resin (not shown) or the like, so that the microlens array 5 and the sensor array 1 are arranged.
The image error due to impurities between the first and the second is eliminated, and the adverse effect on the performance in reading the original can be avoided.

Further, the light source 2 and the sensor array 1 having a plurality of photoelectric conversion elements are constituted by different members, and the light source 2 and the sensor array 1 are mounted on the same substrate 1-2, When it is stored inside the frame, the adjustment work and jigs and tools are not required, and the workability is improved. The sensor array 1 is protected by the sensor protection resin 1-7 in this embodiment.

In the fourth embodiment of the present invention shown in FIG. 4, the original is conveyed on the upper part of the cover glass 3, the sensor array 1, the short focus image forming element array 5, and the light source 2 are arranged.
And are housed inside the frames 4-1 and 4-2 to assemble the contact image sensor. In such a document reading apparatus, in order to solve the problem that the number of parts is large, the sensor array 1 and the light source 2 are provided on the same substrate 1-.
2 is used, and a lens type light guide 2 for guiding the light flux of the light source 2 to the document reading device is used.
7, and by mounting the light source 2 on the substrate 1-2 of the sensor array 1 in the same manner,
It is possible to reduce the number of parts of the document reading device.

[0023]

As described above, the present invention provides a light source, a sensor array having a plurality of photoelectric conversion elements, and
In a document reading apparatus having a support for integrally supporting them, a sensor array having a plurality of photoelectric conversion elements is housed in a fluorescent display tube, thereby reducing the number of parts and providing a simple structure. Can also,
When each member is housed inside the frame, adjustment work such as position adjustment is not necessary, and a jig or tool for holding the parts is unnecessary, and the workability can be improved.

Further, in the device which has already proposed the contact type image sensor, the outer diameter dimension of the converging fiber lens array determines the outer diameter dimension of the contact type image sensor, which is an obstacle to miniaturization. However, miniaturization can be achieved by configuring this with a fiber array or a microlens array.

Further, by using the fiber array or the microlens array also as the cover glass for holding the moving original document, the member can be fixed to the uppermost part of the frame by integral molding with the frame, and each member can be fixed inside the frame. When it is stored in, the adjustment work such as positioning and jigs and tools are not required, and workability can be improved.

Further, by bonding the microlens array to the cover glass by using the optical adhesive resin, the work of attaching the cover glass to the frame becomes unnecessary and the workability can be improved. Further, if necessary, by providing a glass member between the microlens array and the sensor array, it is possible to prevent the intrusion of impurities and prevent the image leveler due to the impurities.

By providing the light source, the sensor array, and the components attached to the light source on the same substrate, the workability in assembly can be improved and the number of components can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional side view of a first embodiment of a document reading apparatus of the present invention.

FIG. 2 is a schematic vertical sectional side view of a second embodiment of the present invention.

FIG. 3 is a schematic vertical sectional side view of a third embodiment of the present invention.

FIG. 4 is a schematic vertical sectional side view of a fourth embodiment of the present invention.

FIG. 5 is a schematic vertical sectional side view of a document reading apparatus already proposed.

[Explanation of symbols]

 1 Sensor Array 1-1 Sensor 1-2 Sensor Substrate 1-3 Bump 1-4 Conductive Material 1-5 Sensor Alignment Substrate 1-6 Transparent Electrode 1-7 Protective Resin 2 Light Source 2-0 Fluorescent Display Tube 2-1 Cathode Electrode 2-2 Grid electrode 2-3 Phosphor 2-4 Anode electrode 2-5 Wiring 2-6 Insulating layer 2-7 Light guide 3 Cover glass 4-0, 4-1 and 4-2 Frame 5 Fiber lens ( Short-focus imaging element lens) 5-0 Transmission plate glass 6 External connection terminal 7 Transparent plate

Claims (8)

[Claims] 1. A document reading apparatus having a light source, a sensor array having a plurality of photoelectric conversion elements, and a support for integrally supporting them, and a sensor array having a plurality of photoelectric conversion elements. An original reading device characterized by being housed in a fluorescent display tube. 2. A document reading apparatus having a light source, a short-focus image-forming element array, a sensor array having a plurality of photoelectric conversion elements, and a support for integrally supporting them, in which a short-focus image is formed. A document reading, characterized in that a fiber array is used as an image element array, the fiber array is also used as a cover glass for holding a moving document, and this is formed integrally with a frame for holding each member inside. apparatus. 3. A document reading apparatus having a light source, a short-focus image-forming element array, a sensor array having a plurality of photoelectric conversion elements, and a support for integrally supporting them, in which a short-focus image is formed. A document reading device, wherein a microlens array is used as an image element array, and the microlens array is bonded to a cover glass for holding a moving document with an optical adhesive resin. 4. The original reading device according to claim 3, wherein the cover glass for holding the moving original is integrally formed with a holding frame of the apparatus. 5. A glass member for preventing impurities from entering is disposed between the microlens array and a sensor array having a plurality of photoelectric conversion elements for holding a moving original, and the glass member is provided as described above. The document reading device according to claim 3, wherein the microlens array is bonded with an optical adhesive resin. 6. The document reading device according to claim 3, wherein the light source is integrally mounted on a sensor array substrate having a plurality of photoelectric conversion elements. 7. A document reading apparatus having a light source, a short-focus imaging element array, a sensor array having a plurality of photoelectric conversion elements, and a support for integrally supporting them, wherein a plurality of photoelectric conversion elements are provided. An original reading apparatus, wherein the light source is mounted on a substrate of a sensor array including a conversion element, and a lens for guiding a light flux of the light source is provided at an original reading position. 8. The apparatus according to claim 1, further comprising means for holding a document at a document reading position.
7. The document reading device according to item 7.