US5357065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit unit for electronic instrument having key-pad arrangement
Assignee: Fujitsu Ltd
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Filing: 1993-07-09
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Granted: 1994-10-18
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Expires: 2013-07-09
Abstract
Abstract A circuit unit is used in an electronic instrument having a key-pad arrangement, such as a portable telephone, and comprises a printed circuit board, a flexible switch circuit sheet attached to the printed circuit board and having a plurality of switch pads arranged thereon, and at least one circuit pattern formed in the flexible switch circuit sheet so as to construct a switch circuit together with the switch pads. The circuit pattern includes a plurality of line sections extended between the switch pads, and a plurality of terminals provided along a peripheral edge of the flexible switch circuit sheet for establishing an electrical connection between the printed circuit board and the flexible switch circuit sheet.
Inventors
- 👤 Fumio Mitamura
- 👤 Mitsuo Inagaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:14
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/02; H04M1/23; H01; H01H; H01H13/00; H01H13/70; H01H13/7006; H04B; H04B1/00; H04B1/38; H04B1/40; H04B1/401; H01H2207/00; H01H2207/02; H01H2207/04; H01H2221/00; H01H2221/062; H01H2229/00; H01H2229/02; H01H2229/024; H01H2229/028; H04M1/0202; H04M1/0206; H04M1/0208; H04M1/0214
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
A circuit unit incorporated in an electronic instrument having a key-pad arrangement, which unit comprises: a printed circuit board; a flexible switch circuit sheet attached to said printed circuit board and having a plurality of switch pads arranged thereon; and at least one circuit pattern formed in said flexible switch circuit sheet so as to construct a switch circuit together with said switch pads, said circuit pattern including a plurality of line sections extended between said switch pads, and a plurality of terminals provided along a peripheral edge of said flexible switch circuit sheet for establishing electric connection between said printed circuit board and said flexible switch circuit sheet.
Claim 2
Dependent Claim
109 words
A circuit unit incorporated in an electronic instrument having a key-pad arrangement, which unit comprises: a printed circuit board; a flexible switch circuit sheet attached to said printed circuit board and having a plurality of switch pads arranged thereon; and at least one circuit pattern formed in said flexible switch circuit sheet so as to construct a switch circuit together with said switch pads, said circuit pattern including a plurality of line sections extended between said switch pads, and a plurality of terminals provided along a peripheral edge of said flexible switch circuit sheet for establishing electric connection between said printed circuit board and said flexible switch circuit sheet.
Claim 3
Dependent Claim
33 words
A circuit unit as set forth in claim 1, wherein said flexible switch circuit sheet is adhered to said printed circuit board through the intermediary of a self-adhesive or pressure sensitive adhesive layer.
Claim 4
Dependent Claim
27 words
A circuit unit as set forth in claim 1, wherein each of said terminals is soldered to a corresponding terminal pad formed on said printed circuit board.
Claim 5
Dependent Claim
33 words
A circuit unit as set forth in claim 1, wherein said terminals are formed in substantially the same manner as a via-hole or through-hole is formed in a printed circuit board or sheet.
Claim 6
Dependent Claim
28 words
A circuit unit as set forth in claim 1, wherein each of said switch pads comprises a diaphragm pad formed of a suitable metal material such as copper.
Claim 7
Dependent Claim
38 words
A circuit unit as set forth in claim 1, wherein said flexible switch circuit sheet has a multi-layer structure, a central film layer of which has two circuit patterns formed on sides thereof for constructing said switch circuit.
Claim 8
Dependent Claim
30 words
A circuit unit as set forth in claim 6, wherein said multi-layer structure is adhered to said printed circuit board through the intermediary of a self-adhesive or pressure-sensitive adhesive layer.
Claim 9
Dependent Claim
27 words
A circuit unit as set forth in claim 6, wherein each of said terminals is soldered to a corresponding terminal pad formed on said printed circuit board.
Claim 10
Dependent Claim
33 words
A circuit unit as set forth in claim 6, wherein said terminals are formed in substantially the same manner as a via-hole or through-hole is formed in a printed circuit board or sheet.
Claim 11
Dependent Claim
28 words
A circuit unit as set forth in claim 6, wherein each of said switch pads comprises a diaphragm pad formed of a suitable metal material such as copper.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-17 | 1998-04-18 | 1998-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-17 | 2002-04-18 | 2002-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-17 | 2006-04-18 | 2006-10-18 | $7700.00 | Window Closed / Lapsed |