EP0150600A2 - Membranschalteranordnung - Google Patents
Membranschalteranordnung Download PDFInfo
- Publication number
- EP0150600A2 EP0150600A2 EP84308746A EP84308746A EP0150600A2 EP 0150600 A2 EP0150600 A2 EP 0150600A2 EP 84308746 A EP84308746 A EP 84308746A EP 84308746 A EP84308746 A EP 84308746A EP 0150600 A2 EP0150600 A2 EP 0150600A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- switch
- impedance
- conductive
- switch contacts
- contacts
- 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.)
- Withdrawn
Links
Images
Classifications
-
- 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
- H01H13/702—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 with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2239/00—Miscellaneous
- H01H2239/01—Miscellaneous combined with other elements on the same substrate
- H01H2239/012—Decoding impedances
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2239/00—Miscellaneous
- H01H2239/02—Other elements in moving part
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H2239/00—Miscellaneous
- H01H2239/026—Internal encoding, e.g. validity bit
Definitions
- the invention relates generally to membrane or diaphragm switches, and more specifically, to membrane keyboard switch assemblies used for data entry.
- these switches are comprised of a base substrate and a flexible layer separated by spacing means.
- the spacing means has a plurality of openings constituting switch sites.
- the internal surfaces of both the substrate and flexible layer have a pattern of conductive switch contacts thereon, the switch contacts on the layer being aligned with the openings in the spacing means.
- a membrane switch assembly comprised of a base substrate and at least one flexible layer separated from each other by spacing means, the spacing means having a plurality of openings therein constituting switch sites, the internal surfaces of layers adjacent the spacing means having a pattern of conductive switch contacts thereon, the switch contacts on the surfaces being aligned with the openings in the spacing means, the membrane switch assembly is characterised in-that:
- the present invention discloses a membrane switch assembly in which the conductive switch contacts on each layer are interconnected in series along a single conductive path in such a way that a regular unit value of impedance means exists between the switch contacts.
- the unit value of impedance means on one layer may be the same or different from the unit value of impedance means on the other layer.
- the unit value of impedance used on one layer be significantly different from the unit value on the other layer. It is understood, however, that the unit values of impedance on different layers may be varied in any proportion without departing from the spirit or scope of the invention.
- the impedance means may present resistance, capacitance or an inductance between successive switch contacts.
- the signal received is essentially equal to the summation of the unit values along the circuit path.
- This analog signal can be directly converted to digital.
- Increased number of switches can be utilized for a given summation of unit impedance means by utilization of increased digital word length of the A/D converter.
- the signal received will be from the switch having the shortest circuit path.
- the invention disclosed herein is therefore protected from false readings owing to the "phantom.key" effect which can occur with a matrix switch array.
- the output signal from the switch depends on the ratio of the summation of unit value impedance means to that switch site to a reference impedance or to the totality of unit value of impedance means.
- the output signal therefore is independent of variations in environmental and physical changes that may occur to the switches.
- the membrane switch assembly 10 is comprised of an insulating substrate 12, an insulating spacing means 20 and an insulating film layer 16. Spacing means 20 separates the internal surface 14 of substrate 12 and the internal surface 18 of layer 16. Spacing means 20 has openings 22 therein which constitute switch sites.
- the internal surfaces 14 and 18 have a pattern of conductive switch contacts 28 and 28' respectively, thereon.
- the contacts 28 on surface 14 are interconnected in a series along a single conductive path 24.
- the contacts 28' on surface 18 are interconnected in a series along a single conductive path 24'.
- Switch contacts 28 are spaced apart and aligned with switch contacts 28' and with switch sites 22 in the completed assembly.
- the invention as disclosed can be used, for example, in calculators, and keyboards for typewriters and computers.
- the invention also can be used for multiple layers of switches by using additional flexible conductive layers.
- the invention further can be used in touch entry devices for mounting on CRT's if in addition to layer 16, substrate 12 and spacing means 20 are also flexible layer.s.
Landscapes
- Push-Button Switches (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US56427883A | 1983-12-22 | 1983-12-22 | |
US564278 | 1983-12-22 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0150600A2 true EP0150600A2 (de) | 1985-08-07 |
EP0150600A3 EP0150600A3 (de) | 1985-09-18 |
Family
ID=24253846
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84308746A Withdrawn EP0150600A3 (de) | 1983-12-22 | 1984-12-14 | Membranschalteranordnung |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0150600A3 (de) |
JP (1) | JPS60148019A (de) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0251670A2 (de) * | 1986-06-24 | 1988-01-07 | Kabushiki Kaisha Toshiba | Kontrollvorrichtung für Kochgeräte |
US4795897A (en) * | 1986-02-21 | 1989-01-03 | U.S. Philips Corp. | Apparatus for establishing data transfers with a portable electronic card |
GB2226702A (en) * | 1988-12-28 | 1990-07-04 | Brady Co W H | Membrane switchcores |
US9120030B2 (en) * | 2012-10-31 | 2015-09-01 | Leo Paper Bags Manufacturing (1982) Limited | Book assembly with slider-activated switch |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3623080A (en) * | 1970-01-02 | 1971-11-23 | Bunker Ramo | Self-encoding keyboard employing eddy current shorting |
GB2095036A (en) * | 1981-02-19 | 1982-09-22 | Sharp Kk | Membrane keyboards |
JPS5852729A (ja) * | 1981-09-25 | 1983-03-29 | Seiko Epson Corp | タッチセンサ |
-
1984
- 1984-12-11 JP JP59261661A patent/JPS60148019A/ja active Pending
- 1984-12-14 EP EP84308746A patent/EP0150600A3/de not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3623080A (en) * | 1970-01-02 | 1971-11-23 | Bunker Ramo | Self-encoding keyboard employing eddy current shorting |
GB2095036A (en) * | 1981-02-19 | 1982-09-22 | Sharp Kk | Membrane keyboards |
JPS5852729A (ja) * | 1981-09-25 | 1983-03-29 | Seiko Epson Corp | タッチセンサ |
Non-Patent Citations (1)
Title |
---|
PATENTS ABSTRACTS OF JAPAN, vol. 7, no. 138 (P-204)[1283], 16th June 1983; & JP-A-58 052 729 (EPUSON K.K.) 29-03-1983 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4795897A (en) * | 1986-02-21 | 1989-01-03 | U.S. Philips Corp. | Apparatus for establishing data transfers with a portable electronic card |
EP0251670A2 (de) * | 1986-06-24 | 1988-01-07 | Kabushiki Kaisha Toshiba | Kontrollvorrichtung für Kochgeräte |
EP0251670A3 (en) * | 1986-06-24 | 1990-02-21 | Kabushiki Kaisha Toshiba | Control device for cooking apparatus |
GB2226702A (en) * | 1988-12-28 | 1990-07-04 | Brady Co W H | Membrane switchcores |
EP0375832A2 (de) * | 1988-12-28 | 1990-07-04 | W.H. Brady Co. | Membrantastatur mit Tastenzellenkontaktelementen, die für kontinuierliche Datenprüfung miteinander verbunden sind |
EP0375832A3 (de) * | 1988-12-28 | 1991-09-11 | W.H. Brady Co. | Membrantastatur mit Tastenzellenkontaktelementen, die für kontinuierliche Datenprüfung miteinander verbunden sind |
US9120030B2 (en) * | 2012-10-31 | 2015-09-01 | Leo Paper Bags Manufacturing (1982) Limited | Book assembly with slider-activated switch |
Also Published As
Publication number | Publication date |
---|---|
EP0150600A3 (de) | 1985-09-18 |
JPS60148019A (ja) | 1985-08-05 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
AK | Designated contracting states |
Designated state(s): BE DE FR GB IT NL |
|
AK | Designated contracting states |
Designated state(s): BE DE FR GB IT NL |
|
17P | Request for examination filed |
Effective date: 19860221 |
|
17Q | First examination report despatched |
Effective date: 19870624 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN |
|
18W | Application withdrawn |
Withdrawal date: 19871007 |
|
RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: ROWLETTE, JOHN ROBERT Inventor name: BURES, MILAN |