JPS62123865A - Reader - Google Patents

Abstract

PURPOSE:To facilitate the optical axis alignment and to uniform a read sensor face illuminance distribution by arranging a line sensor comprising plural photoelectric transducing elements arranged on a base in the scanning direction and providing an insulation layer on the arranged face. CONSTITUTION:The insulation base 2 with the line sensor 20 mounted on a support base 27 via an adhesives 26 is fitted. The line sensor 20 consists of a CCD where plural photoelectric transducing elements are arranged and arranged in zigzag in the scanning direction on the insulation base 21. The line sensor 20 is mounted on the insulation base 21 by using a mount agent and an input/output bonding pad part and a wire conductor layer are connected. A protection cover 31 is formed by adhering a light transmission plate 32 top the line sensor, an input/output signal extracting wire 30 of the line sensor and a spacer 33 with low melting point glass and using a sealing adhesives.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a reading device that converts an image on an image surface of a document or the like into an electrical signal using a photoelectric conversion element.

[Technical background of the invention and its problems]

2. Description of the Related Art In recent years, contact image sensors have attracted attention and are being actively developed as image reading devices used in scanning copying machines, facsimile machines, and the like. What is this close-contact image sensor?
A 1M document image is formed on an optical sensor array having approximately the same length as the document to be read by using a 1M magnification optical system such as a converging rod lens array, and an image on the document surface is generated. It is for reading information.

Using this close-contact image sensor, you can
A reading device capable of reading long character strings on a manuscript is disclosed in Japanese Patent Laid-Open No. 59-202766. The reading device of this publication (see FIG. 5 of the publication) is characterized by having a plurality of elongated sensors arranged in a staggered manner.

However, when the present inventor conducted a prototype experiment for research purposes, it was found that the following problems existed and the device could not be put to practical use.

(1) The reading sensor (14) surface (
(See FIG. 5 of the publication) is not provided, and there is a problem that the illuminance of the sensor surface is low and the sensor sensitivity is low. Besides, LED
Because the arrays (17a) and (17b) (see Figure 5 of the publication) cannot be arranged at equal illumination distances, the illuminance on the document surface increases, resulting in the problem that uniform reflected light cannot be obtained and complete reading cannot be performed. be.

■ It is practically difficult to align the optical axes of multiple reading sensors with high precision. Especially the resolution is 16dots/mm
If it is more than that, a matching accuracy of around 10 micrometers is required, which is not practical. In addition, since the reading device is constituted by a plurality of module structures, it is heavy and productivity is poor. Furthermore, reading devices using a reduction optical system have problems such as a decrease in resolution, an increase in the size of the entire system, and difficulty in maintenance.

■ Since the reading sensor substrate is a ceramic plate, CCD
There is a risk that the heat generated from the substrate will accumulate, and the CCD will peel off from the substrate due to the bimetallic effect when the resolution il'i and Mt are exposed.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and provides a reading device that allows the reading sensor surface to be arranged perpendicular to the original, etc., makes the illuminance distribution on the reading sensor surface uniform, and furthermore allows easy alignment of the optical axis. The purpose is to provide.

[Summary of the invention]

In order to achieve the above-mentioned object, the reading device of the present invention includes a line sensor consisting of a plurality of photoelectric conversion elements arranged in the scanning direction on a base body, and a line sensor made of a plurality of photoelectric conversion elements arranged on a base body, and a line sensor made of a plurality of photoelectric conversion elements arranged on a base body, is one in which an insulating layer is arranged.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Note that FIG. 1 is a simplified perspective partially broken view of the reading device, and FIG. 2 is a sectional view taken along the line AA in FIG. 1.

The basic configuration of the reading device is that an adhesive member (
26), an insulating substrate (21) to which a line sensor (2o) is attached is fixed. This line sensor (
20) consists of a CCD in which a plurality of photoelectric conversion elements are arranged. The plurality of line sensors (2o) are arranged in a staggered manner in the scanning direction on the insulating substrate (21).

On the other hand, this insulating substrate (21) includes a metal plate (2z) made of a low carbon steel plate or an iron-nickel alloy, and a first insulating layer (2z) made of hard or soft glass formed thereon.
3) and a second insulating layer (24) whose main component is glass, which is formed on the first insulating layer (23). This first insulating layer (23) and second insulating layer (2
4) is formed by printing and firing using thick film technology. On this second insulating layer (24).

A wiring conductor layer (25) is constructed by forming an input/output wiring pattern from the line sensor (20) into a multilayer structure with an insulating layer.

Here, the method of arranging the line sensor (20) will be briefly described. Line sensor (20) on the insulating substrate (21)
is mounted using a mounting agent (29).

A thin wire (
30).

Next, the protective cover (31) will be described. The protective cover (31) of this line sensor (20) includes a light transmitting plate (32) to the line sensor, a thin wire (30) for taking out input/output signals of the line sensor section, a line sensor (20), and a light transmitting plate (32). ) with a spacer (33) to provide a gap between them using a low melting point glass (34), etc., and then apply a sealing adhesive (
35) and the insulating substrate (21) in a nitrogen atmosphere or hot air. Input/output signals to the outside are taken out by the input/output lead wire section (36).

Although not shown, the lead wire connection pad provided on a part of the wiring conductor layer (25) and the input/output lead wire (37)
) may be connected by soldering and molded with resin to reinforce this connection portion (38).

As mentioned above, since the reading device shown in Fig. 1 uses the same insulating substrate, it is possible to arrange the reading sensor surface (the photoelectric conversion element surface of the line sensor) perpendicularly to the document, etc., and the illuminance on the reading sensor surface is also uniform. can be converted into Furthermore, since the line sensors are arranged in a staggered manner on the same substrate, alignment of the optical axes is facilitated, and assembly with other devices such as lenses is facilitated without increasing the size. It goes without saying that this effect can be achieved by arranging the line sensors in a straight line on the same substrate. At the same time, it is possible to obtain a reading system using a highly reliable reading device that can be integrated into a modular structure, improving productivity.

Furthermore, using metal as the insulating substrate allows for efficient conduction of the heat generated from the line sensor.

It is possible to prevent a phenomenon in which a bimetal effect occurs between the line sensor and the insulating substrate, causing the line sensor to curve.

In the above-mentioned embodiment, the insulating layer may have a thickness of one layer by increasing the thickness of two layers, or may have a thickness of more than a silver layer.

At this time, the structure of this insulating layer is the line sensor (20
) The thickness may be controlled to such an extent that it does not interfere with the heat conduction mechanism for heat generated due to power consumption.

Furthermore, the insulating substrate (21) shown in FIG.
6) is attached to the support plate (27). However, this support plate (27) is not absolutely necessary. That is, an extremely thick metal plate (22) is used to prevent warping of the insulating layers (23), (24) and wiring conductor layer (25) during thick film printing and firing, and at the same time, this Attachment holes (28) for external devices etc. may be provided at both ends of the insulating substrate (21).

Furthermore, regarding the protective cover (31), the protective cover (31) has a structure in which the portion corresponding to the peripheral area of the line sensor (20) is concave, and includes the light transmitting plate (30) and the spacer (33). An integrally molded one may also be used.

Additionally, the reading device of the present invention is not limited to using the metal plate (22), and other substrates may be used. In this case, it goes without saying that it is better to use a substrate with good thermal conductivity.

Next, another embodiment of the reading device of the present invention will be described with reference to FIG. Note that FIG. 3 is a simplified cross-sectional view of the reading device of the present invention.

In FIG. 3, a first insulating WJ is provided on the entire surface of the metal plate (22).
(23) is formed. A second insulating layer (24) is formed on the surface of the first insulating layer (23) on which the line sensor (20) is placed. By adopting the structure shown in FIG. 3, the entire surface of the metal plate (22) can be
By covering with ff (23), the bimetal effect caused by the difference in thermal expansion coefficients between the metal plate (22) and the first insulator M (24) is alleviated, and warping of the insulating substrate is prevented. This is particularly effective when the metal plate (22) is thin.

〔Effect of the invention〕

By adopting the above-described configuration, the reading device of the present invention has uniform illuminance on the reading sensor surface, and the reading sensor surface can be disposed perpendicularly to a document or the like. Furthermore, since the line sensors are arranged in a straight line or in a staggered manner on the same substrate, alignment of the optical axes is facilitated, and there is also the effect that assembly with other devices such as lenses is facilitated without increasing the size.

[Brief explanation of drawings]

FIG. 1 is a simplified perspective partially broken view showing one embodiment of the reading device of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. 3 shows another embodiment of the reading device of the present invention. FIG. (20)...Line sensor (21)...Insulating substrate (22)...Metal plate (23)...
First insulating layer (24)...second insulating layer

Claims (8)

[Claims] (1) In a reading device including at least a base body and a line sensor consisting of a plurality of photoelectric conversion elements arranged on the base body in the scanning direction, an insulator is provided on the arrangement surface of the base body on which the line sensor is disposed. A reading device characterized in that layers are arranged. (2) The reading device according to claim 1, wherein the insulating layer consists of one layer. (3) The reading device according to claim 1, wherein the insulating layer is composed of a plurality of layers. (4) The reading device according to claim 2 or 3, wherein the insulating layer is disposed on one side of the base. (5) The reading device according to claim 2 or 3, wherein the insulating layer is disposed on the entire surface of the base. (6) The reading device according to claim 1, wherein the base body is made of a metal with good thermal conductivity. (7) The reading device according to claim 1, wherein a plurality of the line sensors are arranged substantially in a straight line in the scanning direction on the base body. (8) The reading device according to claim 1, wherein a plurality of the line sensors are arranged on the base body in a substantially staggered manner in the scanning direction.