JPS5960822A - Method of producing switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an input switch used in a display device such as a CRT for a computer terminal, and in particular to a touch type input device that detects a suppressed position when the panel surface is pressed with a press ben. The present invention relates to a method for manufacturing a switch.

As a conventional device of this type, one shown in FIG. 1 is known.

FIG. 1 is a cross-sectional view of a conventional switch, with a glass substrate 1
A transparent insulating film 2 made of polyimide, polyester, etc. is placed on top of the insulating film 2, and a conductive paint mixed with carbon or other conductive material is applied onto this insulating film 2 to form a lower electrode 3. Column-shaped spacers 4 made of insulating resin are arranged in a matrix on the top, and further on the spacers 4, an upper electrode 6 which is coated on the lower surface of the flexible sheet 5 in the same way as the lower electrode 3 is arranged. This is then covered with a protective sheet 7.

A voltage is applied to the lower electrode 3 and the upper electrode 5, which are formed of a resistance layer, between both ends perpendicular to each other. The suppression position is recognized by detecting the potential at.

The method for manufacturing the above switch is as follows.

First, a conductive paint is applied onto an insulating film 2 to form a lower electrode 3 made of a resistive layer, and this insulating film 2 is placed on a transparent glass substrate 1.

Next, as shown in FIG. 2(a), a photoresist layer 9 is formed on the lower electrode 3, a mask 10 is placed on the photoresist layer 9, and the unexposed portion is removed by etching. As shown in FIG. 2(b), an insulating spacer 4 is formed.A flexible sheet 5 is formed on this spacer 4, on which an upper electrode 6 is formed in the same manner as the lower itt electrode 3.
are placed so that the upper electrode 6 faces the lower electrode 3, and finally a flexible protective sheet 7 is covered.

However, the spacer 4 formed by the above switch manufacturing method is made of photoresist to form the flat lower electrode 3.
Since it is a separate member placed on top, there is a risk of peeling or displacement, and the reliability of quality is not sufficient.

The present invention has been made in view of the above points, and aims to provide a switch in which a spacer is formed from a glass substrate and is free from peeling off or displacement of the spacer. form,
An electrode material made of organic indium-organotin paste is printed in this recess, this electrode material is fired to form a lower electrode, and a flexible sheet with an upper electrode provided on the lower surface is placed on the glass substrate. The lower electrode and the upper electrode are arranged to face each other with a gap between them in the recess.

Embodiments of the present invention will be described below based on the drawings.

FIG. 3 is a sectional view of a switch manufactured according to an embodiment of the present invention.

In FIG. 3, a transparent glass substrate 1 has a large number of recesses 1a formed in a matrix, and a thin lower electrode 3 is housed in the bottom surface of each recess 1a. The lower electrode 3 is a transparent electrode formed by firing an organic indium-organotin paste, and a lead terminal 11 is connected to the lower surface of the lower electrode from outside the glass substrate 1. A flexible sheet 5 is placed on the glass substrate 1, and a resistive layer 5a coated with conductive paint is formed entirely on the lower surface of the flexible sheet 5. The upper electrode 6 is inserted into the recess 1a and faces the lower electrode 3 with a slight distance therebetween.

Therefore, the glass substrate 1 between the adjacent recesses 1a has the upper and lower electrodes 3
, 6 constitutes a spacer 4 between them.

Although not shown, a constant voltage is applied to both ends of the resistance layer 5a, and due to the contact between the electrodes 3 and 6,
Needless to say, the input position is detected.

Such a switch is manufactured as follows.

Figure 4 shows the first half of the switch manufacturing process. First, a glass substrate 1 is prepared, and the glass substrate 1 is
A photoresist layer 12 is formed thereon. The photoresist layer 12 is covered with a mask 13 as shown in FIG. 4(C), exposed, and the mask 13 is removed as shown in FIG. As shown in (e), the photoresist layer 12 is left in the shape of a protrusion.
) to form a recess 1a in a portion other than the photoresist layer 12 as shown in FIG. 1
A glass substrate 1 in which a is formed in a matrix is obtained.

Electrodes are formed on the glass substrate 1 thus obtained by the steps shown in FIG.

That is, as shown in Fig. 5(a), the concave portion 1a is filled with ta made of organic indium-organotin paste.
The material 13 is stored by printing. Next, add 500 yen of electrode material.
The transparent electrode 3 is obtained by baking with CK.

On the other hand, a resistance layer 5a is coated in advance on the lower surface of a flexible sheet 5 such as a polyimide film, and an upper electrode 6 is made to protrude from the lower surface of the resistance layer 5a as shown in FIG. 5(b). This flexible sheet 5 is placed on the glass substrate 1, the upper electrode 6 and the lower electrode 3 are made to face each other as shown in FIG. 5(e), and finally the protective sheet 7 is covered. is obtained.

In this embodiment, the upper electrode 6 was formed on the resistance layer 5a, but the invention is not limited to this. For example, the upper electrode 6 may be formed on the lower electrode 3 without providing a resistance layer. They may be connected to external terminals independently of each other, as in the example below.

In addition, when forming the recesses on the glass substrate 1, in this embodiment, a method of forming a photoresist layer and etching was adopted, but other methods may be used as long as they are effective for mass production and can form the recesses 1a with high precision. method may also be used.

The present invention is as described above, and a concave part for storing an electrode is formed in a glass substrate, an electrode material made of an organic indium-organotin paste is printed on the four parts, and the lower electrode is formed by firing this electrode material. A flexible sheet with an upper electrode provided on the lower surface thereof is placed on the glass substrate, and the lower electrode and the lower electrode are opposed to each other with an interval in the recess.

Therefore, the spacer between the electrodes is made of a glass substrate,
If the spacer is peeled off or the position is incorrect, it is possible to manufacture highly reliable switches.

[Brief explanation of the drawing]

11g shows a cross section of a conventional switch, and FIG. 2 shows a part of the manufacturing process of a conventional switch, (a) shows an exposure process, (
b) is a diagram showing the state after development, FIG. 3 is a cross-sectional view of a switch according to an embodiment of the present invention, and FIG. 4 is a diagram showing the first half of the manufacturing process of a switch according to an embodiment of the present invention, (a) is a glass substrate, (b) is the formation of the photoresist layer, (C) is during exposure, (d) is after exposure, (
(e) shows the image after development, (f) shows the image after etching, and (g) shows the image after resist peeling. FIG. 5 shows the latter half of the manufacturing process of this example, in which (a) is a printing process, (b) is an explanatory diagram showing a process of assembling the upper electrode, and (C) is an explanatory diagram showing after the upper electrode is installed. 1... Glass substrate, 1a... Concavity, 3
... lower electrode, 5 ... flexible sheet,
6... Upper electrode, 13... Electrode material. Figure 1 Figure 2 Figure 3 Figure 4 Procedural amendment (method) % formula % 1. Indication of the case 1982 Patent Application No. 168590 2. Title of invention Method for manufacturing a switch 3. Amendment Applicant 6: Number of inventions increased by amendment None 7: Subject of amendment (1) [and] on page 6, line 11 of the specification should be opposed as shown in Figure 5 (C). Correct it to the L of "1" with "and" facing each other. (2) “Process of combining,” on page 8 of the specification, lines 4-5.
(C) is an explanatory diagram. " is corrected to "This is an explanatory diagram showing the process of combining." Agent Patent Attorney Kenji Take

Claims (1)

[Claims] A recess for housing the electrode is formed in the glass substrate, an electrode material made of organic indium-organotin paste is printed in this recess, and this electrode material is fired to form a lower electrode, and an upper electrode is previously provided on the lower surface. A method of manufacturing a switch, wherein a flexible sheet is placed under pressure on the glass substrate, and the lower electrode and the upper electrode are opposed to each other with a gap between them in the recess.