JPS5868147A - Keyboard switch - Google Patents

Abstract

PURPOSE:To reduce the thikness of keyboard switches while increasing the density of them, by stacking a sheet forming an upper electrode upon a sheet forming a lower electrode while an insulating wire material is interposed as a spacer. CONSTITUTION:An insulating sheet 2 having electrodes 3 formed in an X-axis direction is opposed to an insulating sheet 2 having electrodes 4 formed in an Y-axis direction. Then, insulating wire materials 5 are provided in gaps between the electrodes 4 on the insulating sheet 2. Those insulating sheets 1 and 2 are stacked with the wire materials 5 between. The wire materials 5 pevent the electrodes 3 and 4 from short-circuiting normally. When, however, the insulating sheet 1 is pressed with a finger 9, electrodes short-circuit, and consequently a matrix output is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to provide a high-density keyboard switch by using an insulating wire for the spacer interposed between the upper and lower electrodes.

Conventional thin keyboard switches have a flexible insulating sheet with an upper electrode formed thereon and an insulating sheet with a lower electrode formed thereon facing each other, with an insulating spacer interposed between them to prevent the two electrodes from normally touching each other. Or, as an insulating spacer, the insulating film was punched out to match the switch pattern of the upper and lower electrodes.

However, the key)ll! ! When trying to increase the degree, it is difficult to use a spacer with a width of 11 mm due to problems with the processing and finishing of the film, and the pitch between the keys is large, making it impossible to do so manually over the entire surface of the keyboard switch (see 1).
The drawback was that the keys were large and difficult to operate due to the high-density key arrangement.

Therefore, in the present invention, in order to eliminate the above-mentioned drawbacks, an insulating binding material is used as a spacer to reduce the dead zone.

The present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view of the insulating sheet in contact with the lower electrode, and FIG. 2 is a plan view of the insulating sheet in contact with the lower electrode.

In Figures 1 and 2, (1) and (2) are insulating sheets made of synthetic resin or the like, (1a
), (2a) are diaphragms each formed with a plurality of upper 'electrodes (3) and lower 'α poles f41, (1b), (2F
)) are terminal connections (3b) and (4b), and (3a) and (4a) are the above-mentioned polarization (3).
, (4) and the terminal connection parts (31) and (4b). In addition, the electrodes (3), (4), lead parts (3a), (4a), terminal connection parts (3b), (4b
) etc., do not print etching of copper-clad plastic substrate, silver paste, or carbon paste with low resistivity L-)
They may be formed by firing, or they may be formed by vapor deposition or sputtering of a transparent four-electrode thin film of silver oxide or indium fermentation, which has a low resistivity. Terminal connection part (3b), (
4b) is arranged so that the diaphragms (lb) and (2b) are arranged in a superimposed manner as will be described later.
Each overhang (1b), (
2b) are arranged in parallel on the top.

Note that in the present invention, the diaphragms (la) and (2a) are provided in a separate pair of insulation sheets [1] and +21;
A fold line is provided on a continuous insulating sheet, and on the opposite side of the fold line are corresponding electrodes (3), (41, 1, 1-dots (3a), (4a), and a terminal connection part (3b), (4
b) Form l~, later insulating sheet] from the above fold line'
The diaphragms (1a) and (2a) of 1-4↓ may be formed so that the electrodes (3) and (4) correspond to each other.

FIG. 3 is a half view of the spacer (5) mounted on the insulating sheet (2). Spacer (5) is at the back>,'
The spacer (5) was formed by the method of 1S, but the spacer (5)-H had an insulating sheet (1
) in a superimposed manner M rt , in which case the upper and lower electrodes (
3), +4) U-shaped spacer (5) allows normal state,
There is no contact when hitting.

Figures 4-81 and 4-b show the structure of the spacer, and the material for the spacer is magnet wire 1.
Insulation-coated metal wires, fusible magnets, insulation-coated metal wires with adhesive layers such as twine, thermal [1] plastic 4-d plastic wires, adhesive knotted plastic wires, wires, insulated fiber wires, etc. Here, Figure 4-a shows an adjustable metal dove ring coated with an insulating coating. , polyi-uniform" --- It is coated with an insulating layer (7) such as a mid-resin, and is used for self-heating by energizing metal wires, ultrasonic bonding, frequency bonding, heat sealing, impulse sealing, etc. A spacer (5) is sandwiched between one side of the sheet or between the insulating sheets (1) and (2) and bonded by thermocompression.

Figure 4-1a shows insulating coated gold (Vj
It is a 11111 figure at one place of the A line, and the metal edge coated with insulation in Figure 4-a has heat-sensitive adhesive properties or pressure-sensitive properties such as nylon, epoxy, polyvinyl butyral, polyvinyl ether, natural rubber, etc. It is coated with an adhesive layer (8) and is thermocompression bonded to one side of an insulating sheet or with a spacer sandwiched between the insulating sheets (1) and (2) by self-heating by energizing a metal wire, heat sealing, impulse sealing, etc. Alternatively, a process may be performed in which only the pressure λt is applied to the pressure-sensitive adhesive. Furthermore, polyethylene soft t'' (vinyl chloride polyglopylene, etc., thermoplastic wire with thermal adhesive properties) was bonded to one side of the edge sheet or an insulating sheet) using the above-mentioned thermal bonding method. You may also glue the spacer (51) in between.

FIG. 5 shows a keyboard 1 according to the invention on an insulating base.
b------ Attach the switch and press the upper sheet with your finger 2.
1 shows the state in which the electrodes (3) and (4) are in contact and the switch is turned on.

As described in detail below, the keyboard switch of the present invention uses a wire material having an insulating property of η as a spacer between the insulating sheets with the electrodes shaped like 11V. The pitch between is dog-saku・t
This has the remarkable effect of reducing the number of dead zones on the entire surface of the keyboard switch, allowing for more efficient key arrangement.

[Brief explanation of the drawing]

Figure 1 is a plan view of the insulating sheet in contact with the upper electrode;
The figure is a plan view of the insulating sheet in contact with the lower 'electrode, and Fig. 3 is a plan view of the present invention in which a spacer is attached to the insulating sheet, Fig. 4-a, and Fig. 4-b. 5 is a cross-sectional side view of an insulating coated metal wire, and FIG. 5 is a top view of a keyboard switch according to the present invention fully attached to an insulating substrate in operation. (1), (2) Insulating sheet (3) Upper part'1 [pole (1)
1) Lower part (5) Spacer 2/1 Figure 2 cL

Claims (1)

[Claims] The insulating sheet forming the upper 'l pole and the lower chamber +t! The fully formed insulating sheets are arranged so that the upper electrode and the lower electrode face each other, and a plurality of spacers made of a composite material having insulation properties are interposed between both insulating sheets, and both insulating sheets are overlapped. Keyboard switch with % characteristics.