US4608465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyboard
Assignee: Canon Inc
•
Filing: 1985-07-02
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Granted: 1986-08-26
•
Expires: 2005-07-02
Abstract
Abstract A keyboard switch has a decoration sheet disposed above a printed circuit board in spaced relation thereto so that a flexible contact disposed between the printed circuit board and the decoration sheet can be moved into and out of contact with the printed circuit board by the depression of the decoration sheet. The decoration sheet is made of a material having a low extensibility, with recessed deforming areas that also serve as key symbols formed integrally with the decoration sheet.
Inventors
- 👤 Yuji Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:26
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/70; H01H13/7006; H01H2207/00; H01H2207/022; H01H2209/00; H01H2209/002; H01H2209/004; H01H2209/016; H01H2215/00; H01H2215/034; H01H2215/036
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
131 words
A keyboard switch comprising: a printed circuit board including at least one stationary contact disposed on one surface thereof; spacing means mounted on said one surface of said printed circuit board; a movable contact mounted with said spacing means in spaced relation to an associated stationary contact for movement theretoward to make electrical connection therewith; and a decoration sheet mounted on said spacing means with each said movable contact lying between said decoration sheet and said printed circuit board, said decoration sheet including an embossed key symbol indicia formed therein in association with each said movable contact so that a click operation takes place about said embossed key symbol indicia when a depressive force is applied thereto to move said associated movable contact into electrical connection with said associated stationary contact.
Claim 2
Dependent Claim
131 words
A keyboard switch comprising: a printed circuit board including at least one stationary contact disposed on one surface thereof; spacing means mounted on said one surface of said printed circuit board; a movable contact mounted with said spacing means in spaced relation to an associated stationary contact for movement theretoward to make electrical connection therewith; and a decoration sheet mounted on said spacing means with each said movable contact lying between said decoration sheet and said printed circuit board, said decoration sheet including an embossed key symbol indicia formed therein in association with each said movable contact so that a click operation takes place about said embossed key symbol indicia when a depressive force is applied thereto to move said associated movable contact into electrical connection with said associated stationary contact.
Claim 3
Dependent Claim
27 words
A keyboard switch according to claim 1, wherein said material of low extensibility is selected from the group consisting of polyester film, polycarbonate film and vinylchloride film.
References Cited (Backward Citations)
US4071718A
Cited
US4128744A
Cited
US4322587A
Cited
US4314116A
Cited
US4375585A
Cited
US4492829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |