JPS63221519A - Keyboard 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 Field of the Invention The present invention relates to an operating keyboard switch used in a control device for a high-frequency heating device.

Conventional technology In recent years, high-frequency heating devices have been manufactured using microcomputers (hereinafter referred to as microcomputers) to perform complex cooking sequences and use various sensors. The equipment having the device is equipped with an input keyboard as shown in FIG. 3, in order to convey the operator's intentions. In the conventional manual key system, one key uses a switch with two contacts, as shown in Figure 4, and a keyboard with an IJ wax configuration, which combines the output signal system of the microcomputer and the input signal system, is common. However, a manual key system has also been proposed, as shown in FIG. 6, which uses an analog input terminal and a digital input terminal, and is equipped with a key switch in which one key has three contacts.

In the latter manual key system, the structure is generally separated into a lower electrode side 4 and an upper electrode side, as shown in FIG.

Problems to be Solved by the Invention However, in the case of such a key switch, the contact electrode is separated into two surfaces, the upper and lower surfaces, so the lead wire from the electrode also needs to be drawn out from the two surfaces. Ta. FIG. 6 shows a lead line of the lower electrode, and 7 shows a lead line of the upper electrode.

These electrodes are made by printing carbon or silver paste on a plastic film such as POIJ x Stell, and then cutting the plastic film. Therefore, if there is a protrusion for a leader wire, the area used for the film will be reduced. In addition, the outer shape is complicated, making it difficult to make a receptacle, and the cost is high.

Moreover, since the two lead wires of the upper electrode and the lower electrode overlap, there is a drawback that it becomes difficult to connect them using a connector. Furthermore, since the upper electrode and the lower electrode face each other, there is a drawback that the connector needs to be in contact with both sides. The present invention solves these conventional problems, and by connecting the upper electrode and the lower electrode with a simple configuration, the film area of the upper electrode can be reduced, and a connector with single-sided contact can be used. This provides a keyboard switch that is excellent in terms of cost and workability.

Means for Solving the Problems The keyboard switch of the present invention has first and second electrodes arranged on one plane, and a third electrode arranged on a plane facing the first and second electrodes with a small space. At the same time, a third lead wire is provided on the same plane as the first and second lead wires of the first and second electrodes, and the third electrode wire is electrically connected to the third lead wire. It is something that connects.

Function The keyboard switch of the present invention can form the lead wires of the electrodes on one plane by the above means, so the cost can be reduced because the number of films for the lead wires, which conventionally required two films, can be reduced to one. Can be lowered. moreover,
When connecting these lead wires to connectors, etc., 2
Workability is improved by reducing the number of sheets to one. Furthermore, since the wiring is formed on the same plane, an inexpensive one-plane contact connector can be used for the connection.

Embodiment Hereinafter, a keyboard switch according to an embodiment of the present invention will be explained with reference to the drawings.

As shown in FIG. 1, the lower film 8 with two electrodes of the keyboard switch, which has a contact configuration with three electrodes in one key switch, has lead wires 9 and 10 connected to the two electrodes. .

Further, as shown at 11, a third lead-out wiring is provided, and the other end is connected to a pattern provided around the screw hole 12 for fixing the keyboard. The connection wiring 16 of the electrode 14 of the film 13 where the other electrodes of the key switch are located is connected to a pattern provided so as to surround the screw hole 16 in the same manner as described above.

Electrode wiring on the film shown in 8 and the film shown in 13
The second electrode wiring faces oppositely. The upper film 13 and the lower film 8 shown in FIG. 1 are pasted together with a spacer film 17 interposed therebetween to form a keyboard. On the lower film 8, resistors R8-R3 shown in the circuit of FIG. 6 are formed by printing.

The action of this resistor will be explained using FIG. 6.

The microcomputer 18 has an input terminal 1 which detects the binary value of input or not, and an analog input terminal M/D1 which can detect which voltage is input between +6v and 070 which is the power supply voltage. This terminal is connected to the keyboard 3.

When one of the four switches SW1 to SW4 on the keyboard 3 is pressed, +6v is input to K1 human power, and SW1
It is possible to detect that any switch from SW4 to SW4 has been pressed. Furthermore, by detecting the voltage of SW1, it is possible to detect which one of SW1 to SW4 has been pressed.

FIG. 2 shows the keyboard switch 19 of the present invention on a panel 20.
By tightening the screws 22 to the metal plate 21, the upper connection wiring 16 of FIG. 1 and the third lead-out wiring 11 of the lower electrode are connected by pressure contact.

Effects of the Invention As described above, the keyboard switch of the present invention connects the upper electrode and the lower electrode with a simple structure, so that the lead wiring of the upper electrode can be reduced, so the film area of the upper electrode is reduced, and the cost is reduced. Become. Furthermore, since there is only one lead wire, when connecting work using connectors, etc.,
Work errors and work efficiency are improved. Also, since the electrode of the lead wiring is on one side, an inexpensive connector with one side contact can be used. In addition, the connection between the upper connection wiring and the lower electrode lead-out wiring is done by tightening screws when fixing the keyboard switch, so no parts or special work are required for connection, and it can be realized at low cost. It is extremely advantageous.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of essential parts of a keyboard switch according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, FIG. 3 is a perspective view of a general heating device, and FIG. FIG. 5 is a circuit diagram of a conventional keyboard, and FIG. 6 is an exploded perspective view of essential parts of a conventional keyboard switch. 8...Lower film, 9,10.11...
...Drawer arrangement k, 12... Screw hole, 13...
...Electrode film, 14... Electrode, 16...
...Connection wiring, 16...Screw hole, 17...
...Spacer, 18...Microcomputer, 19...
...Keyboard switch of the present invention, 20...
・Panel, 21...Gold M plate, 22...
Screw. Name of agent: Patent attorney Toshio Nakao 1 person δ°
-゛F field to 9-zu 11 manning f2--bis holding ts-42, non-741 and 4

Claims (2)

[Claims] (1) Consisting of a contact structure having three electrodes in one switch, the first and second electrodes of the three electrodes of one switch are arranged on one plane, and the third electrode is arranged on one plane. A third lead wire is arranged on a plane facing the first and second electrodes with a small space therebetween, and a third lead wire is provided on the same plane as the first and second lead wires of the first and second electrodes. , a keyboard switch configured to electrically connect the third lead wire and the third electrode. (2) The keyboard switch according to claim 1, wherein the electrical connection between the third lead wire and the third electrode is crimped with a screw that fixes the entire switch.