JPS6458121A - Touch switch - Google Patents
Touch switchInfo
- Publication number
- JPS6458121A JPS6458121A JP21621787A JP21621787A JPS6458121A JP S6458121 A JPS6458121 A JP S6458121A JP 21621787 A JP21621787 A JP 21621787A JP 21621787 A JP21621787 A JP 21621787A JP S6458121 A JPS6458121 A JP S6458121A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- circuit
- signal propagation
- touch plate
- phase difference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Electronic Switches (AREA)
Abstract
PURPOSE:To eliminate malfunction due to external noise by relating the operation or nonoperation of a touch switch to a fact whether or not a static capacitance enters the touch plate thereby eliminating the effect of the operating environment and eliminating the need for adjustment attended with the environmental change. CONSTITUTION:An input of the 1st signal propagation circuit 2 is connected to a signal wave input and the signal propagation output of the DC impedance 3 constituting the signal propagation circuit 2 is connected to the touch plate 1. A 2nd signal propagation circuit 5 outputs an electric signal wave in phase with that of the output signal of the circuit 2 when the touch plate 1 is not brought into contact. Without any contact to the touch plate 1, the output signals from the signal propagation circuits 2, 5 are given to a phase difference detection circuit 7 in phase and a signal representing noncontact is outputted from the phase difference detection circuit 7. If the touch plate 1 is brought into contact, a static capacitance is given and the retarded electric signal wave is outputted from the signal propagation circuit 2. Thus, a phase difference appears between two input electric signal waves of the phase difference detection circuit 7 and a signal representing the operating state of the touch switch is outputted from the detection circuit 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21621787A JPS6458121A (en) | 1987-08-28 | 1987-08-28 | Touch switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21621787A JPS6458121A (en) | 1987-08-28 | 1987-08-28 | Touch switch |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6458121A true JPS6458121A (en) | 1989-03-06 |
Family
ID=16685111
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21621787A Pending JPS6458121A (en) | 1987-08-28 | 1987-08-28 | Touch switch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6458121A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100117977A1 (en) * | 2008-11-08 | 2010-05-13 | Tatsuya Yoshino | Fluorescent Display Tube And Fluorescent Display Device Having Touch Switch Portion |
| CN105811957A (en) * | 2016-04-22 | 2016-07-27 | 福州福大海矽微电子有限公司 | Capacitive touch sensitive button and digital tube drive multiplexing circuit, and method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5738833U (en) * | 1980-08-12 | 1982-03-02 |
-
1987
- 1987-08-28 JP JP21621787A patent/JPS6458121A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5738833U (en) * | 1980-08-12 | 1982-03-02 |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100117977A1 (en) * | 2008-11-08 | 2010-05-13 | Tatsuya Yoshino | Fluorescent Display Tube And Fluorescent Display Device Having Touch Switch Portion |
| CN105811957A (en) * | 2016-04-22 | 2016-07-27 | 福州福大海矽微电子有限公司 | Capacitive touch sensitive button and digital tube drive multiplexing circuit, and method |
| CN105811957B (en) * | 2016-04-22 | 2019-03-19 | 福州福大海矽微电子有限公司 | A kind of capacitance touch induced key and charactron driving multiplex circuit and method |
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