GB1462777A - Touch actuated electronic switch - Google Patents
Touch actuated electronic switchInfo
- Publication number
- GB1462777A GB1462777A GB5587473A GB5587473A GB1462777A GB 1462777 A GB1462777 A GB 1462777A GB 5587473 A GB5587473 A GB 5587473A GB 5587473 A GB5587473 A GB 5587473A GB 1462777 A GB1462777 A GB 1462777A
- Authority
- GB
- United Kingdom
- Prior art keywords
- amplifier
- touch plate
- touch
- capacitor
- operator
- 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.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/962—Capacitive touch switches
Landscapes
- Electronic Switches (AREA)
- Position Input By Displaying (AREA)
- Amplifiers (AREA)
Abstract
1462777 Touch responsive switching systems MAGIC DOT Inc 3 Dec 1973 [12 Jan 1973] 55874/73 Heading G1N In a touch operated switch the touch plate 12 is connected to one input 26 of a differential amplifier 78 to both inputs 24, 26 of which are also supplied an alternating common mode voltage from source 22 and the output of which is coupled to an integrator 16. The amplifier 78 is provided with a capacitor 82 to provide a shunt at the alternating frequency of the common mode voltage for the amplifier output. Initially when touch plate 12 is not touched the amplifier 78 is balanced and the circuit is arranged so that the voltage at 140 is at the supply voltage. Transistor 168 of amplifier 165 is biased off and there is no voltage across integrating capacitor 16. Amplifier 18 including Darlington pair 184, 186 is non-conducting and there is a high impedance across terminals 204, 84. When the touch plate is touched by an operator current flows from source 22 to earth through the capacitance of the operator's body resulting in amplifier 78 being unbalanced. When the output of amplifier 78 changes state 140 is at earth potential so that transistor 168 is turned on and capacitor 16 charged. Amplifier 18 becomes conducting and the impedance across terminals 204, 84 changes to a low value. The lead 30 to the touch plate is twisted in a pair with conductor 28 to obtain a better noise suppression. By appropriate modification of the circuit the potentials at 140 may be opposite to those described above. In a modification, Fig. 2 (not shown) the touch plate 12 is connected to terminal 24 and a capacitor of value equivalent to that of an operator is coupled between input terminal 26 and ground. In this arrangement the differential amplifier is unbalanced normally but becomes balanced when the operator touches the touch plate.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US32330373A | 1973-01-12 | 1973-01-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1462777A true GB1462777A (en) | 1977-01-26 |
Family
ID=23258607
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5587473A Expired GB1462777A (en) | 1973-01-12 | 1973-12-03 | Touch actuated electronic switch |
Country Status (9)
| Country | Link |
|---|---|
| JP (1) | JPS49109870A (en) |
| CA (1) | CA1022642A (en) |
| CH (1) | CH578806A5 (en) |
| DE (1) | DE2400644A1 (en) |
| FR (1) | FR2298234A1 (en) |
| GB (1) | GB1462777A (en) |
| IL (1) | IL43873A (en) |
| IT (1) | IT1000569B (en) |
| ZA (1) | ZA739255B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2117117A (en) * | 1982-03-19 | 1983-10-05 | Starcote Limited | Touch responsive switching arrangement |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3992634A (en) * | 1975-05-09 | 1976-11-16 | Magic Dot, Inc. | Touch actuated electronic switch including protection from high potential electricity |
| US4081700A (en) * | 1976-06-16 | 1978-03-28 | Hamilton Ii William F | Touch control switch circuit with compensation for power supply line fluctuations |
| US4731548A (en) * | 1986-09-29 | 1988-03-15 | Nartron Corporation | Touch control switch circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1466304B2 (en) * | 1964-10-31 | 1969-09-11 | Siemens AG, Berlin und München, 8520 Erlangen | Device for generating a signaling or control voltage |
-
1973
- 1973-12-03 GB GB5587473A patent/GB1462777A/en not_active Expired
- 1973-12-05 ZA ZA739255A patent/ZA739255B/en unknown
- 1973-12-11 CA CA187,861A patent/CA1022642A/en not_active Expired
- 1973-12-20 IT IT70789/73A patent/IT1000569B/en active
- 1973-12-20 IL IL43873A patent/IL43873A/en unknown
-
1974
- 1974-01-07 CH CH12374A patent/CH578806A5/xx not_active IP Right Cessation
- 1974-01-08 DE DE2400644A patent/DE2400644A1/en not_active Withdrawn
- 1974-01-11 FR FR7401008A patent/FR2298234A1/en active Granted
- 1974-01-11 JP JP49006504A patent/JPS49109870A/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2117117A (en) * | 1982-03-19 | 1983-10-05 | Starcote Limited | Touch responsive switching arrangement |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2298234B1 (en) | 1979-05-11 |
| CA1022642A (en) | 1977-12-13 |
| FR2298234A1 (en) | 1976-08-13 |
| IT1000569B (en) | 1976-04-10 |
| DE2400644A1 (en) | 1974-08-08 |
| CH578806A5 (en) | 1976-08-13 |
| IL43873A0 (en) | 1974-03-14 |
| AU6343873A (en) | 1975-06-12 |
| ZA739255B (en) | 1974-10-30 |
| JPS49109870A (en) | 1974-10-18 |
| IL43873A (en) | 1976-08-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB1215590A (en) | Field-effect transistor amplifier | |
| GB1378823A (en) | Touch sensitive electronic switch | |
| GB1247880A (en) | Leakage controlled electric charge switching and storing circuitry | |
| GB761853A (en) | Improvements relating to charging and/or discharging circuits for condensers | |
| GB1256638A (en) | ||
| GB1462394A (en) | Detecting apparatus | |
| GB1462777A (en) | Touch actuated electronic switch | |
| GB1448835A (en) | Pulse level modifying circuits | |
| US3488520A (en) | Gating circuit arrangement | |
| GB813307A (en) | Transistor integrating circuits | |
| GB982453A (en) | Improvements in transistor circuits | |
| US3947696A (en) | Touch actuated electronic switch | |
| GB1322253A (en) | Voltage and temperature stabilized monostable circuits | |
| GB1241746A (en) | Buffer circuit for gating circuits | |
| US3508120A (en) | Semiconductor switching circuit | |
| GB1254774A (en) | Comparison amplifier | |
| GB1071293A (en) | Current steered logic circuits | |
| KR890009078A (en) | Delay circuit | |
| GB1491348A (en) | Touch or proximity actuated electronic switch | |
| GB1482140A (en) | Touch control arrangement | |
| DE3369039D1 (en) | Integrated amplifier circuit | |
| GB1108368A (en) | Improvements in or relating to an electronic circuit apparatus | |
| GB874667A (en) | Improvements in or relating to passive electronic switches | |
| GB1178381A (en) | Improvements in or relating to Electrical Switching Circuitry. | |
| GB931864A (en) | Improvements in or relating to electronic limiter circuits |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |