GB1399252A - Electrical signal initiating keyboards - Google Patents
Electrical signal initiating keyboardsInfo
- Publication number
- GB1399252A GB1399252A GB1577771A GB1577771A GB1399252A GB 1399252 A GB1399252 A GB 1399252A GB 1577771 A GB1577771 A GB 1577771A GB 1577771 A GB1577771 A GB 1577771A GB 1399252 A GB1399252 A GB 1399252A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electret
- button
- capacitance
- metal plate
- moulding
- 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
- 230000000977 initiatory effect Effects 0.000 title 1
- 239000000463 material Substances 0.000 abstract 3
- 239000003550 marker Substances 0.000 abstract 2
- 239000002184 metal Substances 0.000 abstract 2
- 238000000465 moulding Methods 0.000 abstract 2
- 239000004812 Fluorinated ethylene propylene Substances 0.000 abstract 1
- 239000004743 Polypropylene Substances 0.000 abstract 1
- 239000004020 conductor Substances 0.000 abstract 1
- 229920001577 copolymer Polymers 0.000 abstract 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 abstract 1
- 230000004927 fusion Effects 0.000 abstract 1
- 239000011159 matrix material Substances 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 229920009441 perflouroethylene propylene Polymers 0.000 abstract 1
- 239000004033 plastic Substances 0.000 abstract 1
- 229920003023 plastic Polymers 0.000 abstract 1
- -1 polypropylene Polymers 0.000 abstract 1
- 229920001155 polypropylene Polymers 0.000 abstract 1
- 239000004065 semiconductor Substances 0.000 abstract 1
- 125000006850 spacer group Chemical group 0.000 abstract 1
- 239000007921 spray Substances 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04M—TELEPHONIC COMMUNICATION
- H04M1/00—Substation equipment, e.g. for use by subscribers
- H04M1/02—Constructional features of telephone sets
- H04M1/23—Construction or mounting of dials or of equivalent devices; Means for facilitating the use thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G7/00—Capacitors in which the capacitance is varied by non-mechanical means; Processes of their manufacture
- H01G7/02—Electrets, i.e. having a permanently-polarised dielectric
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
-
- 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
- H03K17/965—Switches controlled by moving an element forming part of the switch
- H03K17/975—Switches controlled by moving an element forming part of the switch using a capacitive movable element
- H03K17/98—Switches controlled by moving an element forming part of the switch using a capacitive movable element having a plurality of control members, e.g. keyboard
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2205/00—Movable contacts
- H01H2205/032—Several contacts formed in one plate or layer
- H01H2205/034—Several contacts formed in one plate or layer with snap action
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2207/00—Connections
- H01H2207/022—Plug
- H01H2207/024—Plug in top layer
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2209/00—Layers
- H01H2209/006—Force isolators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2215/00—Tactile feedback
- H01H2215/03—Sound
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2221/00—Actuators
- H01H2221/002—Actuators integral with membrane
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2221/00—Actuators
- H01H2221/036—Return force
- H01H2221/04—Return force magnetic
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2221/00—Actuators
- H01H2221/05—Force concentrator; Actuating dimple
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2227/00—Dimensions; Characteristics
- H01H2227/028—Key stroke
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2231/00—Applications
- H01H2231/022—Telephone handset
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2239/00—Miscellaneous
- H01H2239/004—High frequency adaptation or shielding
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2239/00—Miscellaneous
- H01H2239/006—Containing a capacitive switch or usable as such
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2239/00—Miscellaneous
- H01H2239/008—Static electricity considerations
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
- H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
- H03K2217/96—Touch switches
- H03K2217/96015—Constructional details for touch switches
- H03K2217/96027—Piezoelectric snap spring
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Signal Processing (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Manufacture Of Switches (AREA)
- Push-Button Switches (AREA)
Abstract
1399252 Push button switching systems POST OFFICE 17 May 1972 [19 May 1971] 15777/71 Heading G1N [Also in Divisions G4 and H4] A keyboard for use in a telephone instrument or other apparatus employs an electret to precharge the capacitance between the 'button' and a marker plate. In the embodiment described the keyboard comprises twelve buttons 1 formed as a one piece moulding of resilient plastics material. Beneath moulding 2 is a metal plate 6 having portions 9 which can flex downwards in a snap action manner when button 1 is pressed and return to the position shown when it is released. The metal plate 6 is spaced from electret 13 by spacers 11. The electret material, which may be p.t.f.e., is preferably heat fused to a matrix of conductors forming a marker plate and cold spray charged after fusion. The change in capacitance is detected by high impedance circuitry using MOS or JFET semiconductor devices. In a modification the electret may be attached to the moving button member. The electret material may be in the form of a film of p.t.f.e., fluorinated ethylene propylene (copolymer) or polypropylene.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1577771A GB1399252A (en) | 1971-05-19 | 1971-05-19 | Electrical signal initiating keyboards |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1577771A GB1399252A (en) | 1971-05-19 | 1971-05-19 | Electrical signal initiating keyboards |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1399252A true GB1399252A (en) | 1975-07-02 |
Family
ID=10065285
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1577771A Expired GB1399252A (en) | 1971-05-19 | 1971-05-19 | Electrical signal initiating keyboards |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1399252A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2133139A (en) * | 1982-12-29 | 1984-07-18 | Western Electric Co | Touch sensitive device |
| EP0693762A1 (en) * | 1994-07-18 | 1996-01-24 | VELLEMAN-SWITCH, naamloze vennootschap | Membrane keyboard |
| WO1998003983A1 (en) * | 1996-07-22 | 1998-01-29 | Ericsson Inc. | Universal keypad assembly |
| WO2010020753A2 (en) * | 2008-08-18 | 2010-02-25 | Semblant Limited | Halo-hydrocarbon polymer coating |
| US8618420B2 (en) | 2008-08-18 | 2013-12-31 | Semblant Global Limited | Apparatus with a wire bond and method of forming the same |
| US8995146B2 (en) | 2010-02-23 | 2015-03-31 | Semblant Limited | Electrical assembly and method |
| US9648720B2 (en) | 2007-02-19 | 2017-05-09 | Semblant Global Limited | Method for manufacturing printed circuit boards |
| US11786930B2 (en) | 2016-12-13 | 2023-10-17 | Hzo, Inc. | Protective coating |
-
1971
- 1971-05-19 GB GB1577771A patent/GB1399252A/en not_active Expired
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2133139A (en) * | 1982-12-29 | 1984-07-18 | Western Electric Co | Touch sensitive device |
| EP0693762A1 (en) * | 1994-07-18 | 1996-01-24 | VELLEMAN-SWITCH, naamloze vennootschap | Membrane keyboard |
| WO1998003983A1 (en) * | 1996-07-22 | 1998-01-29 | Ericsson Inc. | Universal keypad assembly |
| US9648720B2 (en) | 2007-02-19 | 2017-05-09 | Semblant Global Limited | Method for manufacturing printed circuit boards |
| WO2010020753A2 (en) * | 2008-08-18 | 2010-02-25 | Semblant Limited | Halo-hydrocarbon polymer coating |
| WO2010020753A3 (en) * | 2008-08-18 | 2010-06-24 | Semblant Limited | Halo-hydrocarbon polymer coating |
| US8618420B2 (en) | 2008-08-18 | 2013-12-31 | Semblant Global Limited | Apparatus with a wire bond and method of forming the same |
| US9055700B2 (en) | 2008-08-18 | 2015-06-09 | Semblant Limited | Apparatus with a multi-layer coating and method of forming the same |
| US8995146B2 (en) | 2010-02-23 | 2015-03-31 | Semblant Limited | Electrical assembly and method |
| US11786930B2 (en) | 2016-12-13 | 2023-10-17 | Hzo, Inc. | Protective coating |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| CSNS | Application of which complete specification have been accepted and published, but patent is not sealed |