JPH0748336B2 - Sheet-shaped switch manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a sheet-like switch used for a switch such as a timepiece or a desk computer.

[0002]

2. Description of the Related Art In a conventional sheet-shaped switch, electrodes facing each other and lead wires thereof are formed by carbon printing or the like on the inner surfaces of a flexible pressing sheet and a base sheet, respectively. The adhesive layer is formed on the part. Then, both sheets are laminated with a spacer sandwiched between them, and both electrodes are fixed to both sides of the spacer with an adhesive layer in a state in which both electrodes are opposed to each other with a space provided therebetween through a hole provided in the spacer. There is.

[0003]

In the case of manufacturing the above-mentioned conventional sheet-shaped switch, the steps of forming a conductive material for providing electrodes and lead wirings on both sheets and the step of forming an adhesive are respectively performed. It was necessary and the manufacturing process was complicated.

Therefore, an object of the present invention is to provide a method for manufacturing a sheet-shaped switch which can simplify the work.

[0005]

A method for manufacturing a sheet-shaped switch according to the present invention is a flexible pressing sheet, a base sheet provided opposite to the pressing sheet, and a sheet between the two sheets. A switch that forms a pair of contact portions that are close to each other by using a spacer that is provided and a thermoplastic conductive material made of a thermoplastic resin mixed with a conductive substance on the inner surface of either one of the two sheets. and the electrode is formed and its lead-out wire at the same time, the inner surface of the other sheet, the thermoplastic conductive material, and a counter electrode facing the switch electrode and a peripheral electrode separate from the counter electrode at the same time <br/> The spacer is formed with a through hole facing the switch electrode and the counter electrode. Then, the a switch electrode and the counter electrode are opposed with a gap through the hole, pull
Make sure that the outgoing wiring and the peripheral electrode are in contact with both sheets and the spacer.
Space both sheets so that they cover substantially the entire touch surface.
And sandwich them. Therefore, it is characterized in that the lead-out wiring made of a thermoplastic conductive material and the outer peripheral electrode are heat-sealed to fix both sheets to both the front and back surfaces of the spacer.

[0006]

According to the present invention, the lead wire is formed at the same time as the switch electrode and the outer electrode is formed at the same time as the counter electrode by the thermoplastic conductive material made of the thermoplastic resin mixed with the conductive material. Since the wiring and the peripheral electrode are heat-sealed to the spacer, there is no need to form the adhesive layer in a separate step, and one complicated step can be omitted, so that the manufacturing becomes extremely easy.

[0007]

1 to 4, the pressing sheet 1 is made of vinyl chloride resin. It is made of a synthetic resin sheet having a thickness of about 0.1 to 0.5 mm such as polycarbonate resin or PET resin and has flexibility. As shown in FIG. 4, a conductive paste (thermoplastic conductive material) obtained by mixing conductive particles such as carbon in a thermoplastic resin on the inner surface of the pressing sheet.
The counter electrode 2 and the outer peripheral electrode 3 are simultaneously formed by printing.

As shown in FIG. 2, a switch electrode including contact portions 5A and 5B facing the counter electrode 2 is formed on the inner surface of a base sheet made of the same resin as the pressing sheet. The contact portions 5A and 5B are formed in a comb shape facing each other, and their tips are arranged close to each other. Further, the lead wiring 5C of the contact portion 5A and the lead wiring 5D of the contact portion 5b which connects the contact portion 5B and fills the blank space of the base sheet are also formed at the same time. The switch electrodes 5A and 5B and the lead wires 5C and 5D are simultaneously formed in one step by printing a conductive paste (thermoplastic conductive material) similar to that printed on the pressing sheet 1.

The spacer 6 shown in FIG. 3 is formed with a through hole 6a which can face the counter electrode 2 and the switch electrodes 5A and 5B.

The pressing sheet 1, the spacer 6 and the base sheet 4 thus formed are stacked so that the counter electrode 2 and the switch electrodes 5A and 5B face each other through the through hole 6a as shown in FIG. Since the outer peripheral electrode 3 and the lead wires 5C and 5D made of a thermoplastic conductive material usually have no adhesive force, the positioning of the pressing sheet 1, the spacer 6 and the base sheet 4 can be easily performed. And when the alignment is complete,
Peripheral electrode 3 portion of both sheets 1 and 4 and lead wiring 5
By heating and pressing the portions C and 5D to melt the thermoplastic resin in the conductive paste, the sheets 1 and 4 are thermally fused to the spacer 6. Outer peripheral electrode 3 and lead wiring 5
C and 5D are the counter electrode 2 and the switch electrode 5, respectively.
Since it is made of the same material as A and 5B and is formed at the same time, it is not necessary to form the adhesive layer in a separate step as in the conventional case, and the manufacturing process can be facilitated.

The counter electrode 2 of the flexible pressing sheet 1
If you press the above part with your finger from above, the pressing sheet 1 will be dented,
The counter electrode 2 contacts both contact portions 5A and 5B of the switch electrode. As a result, both contact portions 5A and 5B are brought into conduction and the switch is closed. When the finger is released from the pressing sheet 1, the pressing sheet 1 returns to its original state, and the counter electrode 2
Is separated from both contact portions 5A and 5B of the switch electrode, both contact portions are not conducted, and the switch is in an open state.

The pressing sheet is a laminated sheet having a transparent sheet on the surface, and a character below the transparent sheet,
It is also possible to print numbers and the like.

[0013]

As described above, according to the method of the present invention, the pressing sheet, the spacer and the base portion are formed by the outer peripheral electrode formed at the same time as the counter electrode and the lead wiring formed at the same time as the switch electrode by the thermoplastic conductive material. Since the sheets can be heat-sealed, the step of forming the adhesive layer is unnecessary. Further, since the conductive material before heating has no adhesive force, it becomes easy to align the both sheets and the spacer. Then, after the alignment is completed, heating is performed to perform heat fusion. As described above, according to the present invention, the sheet-shaped switch can be manufactured very easily.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a plan view of a base sheet.

FIG. 3 is a plan view of a spacer.

FIG. 4 is a plan view of a pressing sheet.

[Explanation of symbols]

 1 ... Pressing sheet, 2 ... Counter electrode, 3 ... Outer peripheral electrode, 4 ... Base sheet, 5A, 5B ... Contact point (switch electrode), 5C, 5D ... -Drawer wiring, 6 ... Spacer, 6a ... Through hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-58-178925 (JP, A) JP-A-56-78014 (JP, A) JP-A-59-138022 (JP, A) JP-A-59- 157921 (JP, A) Actual opening 57-109533 (JP, U) Actual opening 57-128725 (JP, U) Actual opening 58-36520 (JP, U) Actual opening 61-51622 (JP, U)

Claims (1)

[Claims] 1. A flexible pressing sheet 1 , a base sheet 4 provided to face the pressing sheet 1, and a spacer 6 arranged between the sheets 1 and 4 are used. Switch electrodes 5A and 5B that form a pair of contact points that are close to each other by a thermoplastic conductive material made of a thermoplastic resin mixed with a conductive substance on the inner surface of either one of the sheets 1 and 4 and Simultaneous with lead wires 5C and 5D
Formed in, on the other inner surface of the sheet, by the thermoplastic conductive material, the counter electrode 2 opposed to the switch electrode 5A, 5B
And the outer electrode 3 separated from the counter electrode 2 are formed at the same time , and the spacer 6 is provided with through holes 6a facing the switch electrodes 5A and 5B and the counter electrode 2. switch electrodes 5A, together 5B and the said counter electrode 2 are opposed with a gap through the through hole 6a, the
The lead wires 5C and 5D and the outer peripheral electrode 3 are connected to each other.
Substantially the entire contact surface between the sheets 1 and 4 and the spacer 6
The both sheets 1 and 4 are attached to the spacer 6 so as to cover the surface.
The sheets 1 and 4 are laminated on both sides of the spacer 6 , and the lead wires 5C and 5D made of the thermoplastic conductive material and the outer peripheral electrode 3 are heat-fused to fix the sheets 1 and 4 to the front and back surfaces of the spacer 6 , respectively. A method for manufacturing a sheet-shaped switch having a feature.