EP0323916A2
Expired / Lapsed
EP
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Push-button keypads
Assignee: Marconi Electronic Devices Ltd
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Filing: 1989-01-09
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Granted: —
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Expires: 2009-01-09
Abstract
Abstract A keypad of the kind utilising a profiled one-piece silicone-rubber mat, in which the rigid back plate is coated with electroluminescent material whereby the keys may be back-lit.
Inventors
- 👤 Keith Barrie Doyle
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 15:50
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/78; H01H13/785; H01H13/702; H01H2201/00; H01H2201/022; H01H2201/032; H01H2203/00; H01H2203/036; H01H2203/052; H01H2209/00; H01H2209/024; H01H2209/038; H01H2219/00; H01H2219/002; H01H2219/006; H01H2219/018; H01H2221/00; H01H2221/002; H01H2223/00; H01H2223/002
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
57 words
A push-button keypad in which operation of keys of said keypad is arranged selectively to interconnect respective ones a pattern of electrical contacts provided on an electrically insulating member interposed between said keys and a substantially rigid support plate, wherein said support plate is provided with a coating of electroluminescent material whereby said keys may be backlit.
Claim 2
Dependent Claim
57 words
A push-button keypad in which operation of keys of said keypad is arranged selectively to interconnect respective ones a pattern of electrical contacts provided on an electrically insulating member interposed between said keys and a substantially rigid support plate, wherein said support plate is provided with a coating of electroluminescent material whereby said keys may be backlit.
Claim 3
Dependent Claim
109 words
A push-button keypad comprising a profiled membrane of resilient electrically insulating material formed to provide at least one area arranged to act as a push-button key, the or each said area bearing on its rear face one or more electrically conductive moving contacts, a substantially rigid support plate, and an electrically insulating member interposed between said membrane and said support plate which member carries a pattern of electrical conductors forming substantially fixed contacts in respect of the or each push-button key, said support plate being provided with a coating of electroluminescent material on its surface adjacent said insulating member whereby the or each said push-button key may be backlit.
Claim 4
Dependent Claim
109 words
A push-button keypad comprising a profiled membrane of resilient electrically insulating material formed to provide at least one area arranged to act as a push-button key, the or each said area bearing on its rear face one or more electrically conductive moving contacts, a substantially rigid support plate, and an electrically insulating member interposed between said membrane and said support plate which member carries a pattern of electrical conductors forming substantially fixed contacts in respect of the or each push-button key, said support plate being provided with a coating of electroluminescent material on its surface adjacent said insulating member whereby the or each said push-button key may be backlit.
Claim 5
Dependent Claim
20 words
A push-button keypad in accordance with Claim 1 or Claim 2 wherein the electrically insulating member comprises a polyester film.
References Cited (Backward Citations)
No citation records indexed.
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