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US4255802A
Expired / Lapsed
US
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Electronic timepiece
Assignee: Citizen Watch Co Ltd
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Filing: 1978-11-24
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Granted: 1981-03-10
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Expires: 1998-11-24
Abstract
Abstract An electronic timepiece having a pair of touch-sensitive electrostatic capacitance switches which must be actuated in a predetermined sequence to enable setting of time, etc. to be performed. Setting and selection of quantity to be set are thereafter conducted by actuating said switches.
Inventors
- 👤 Hiroshi Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:23
CPC Classifications
G; G04; G04G; G04G21/00; G04G21/08; G04G5/00; G04G5/04
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
336 words
An electronic timepiece having timekeeping means for producing time information, time display means for displaying said time information, a casing including a transparent face plate disposed to cover said time display means, and setting means comprising: a plurality of externally actuated touch-sensitive switches; a first AND gate having a first input terminal coupled to a first one of said externally actuated switches; a first flip-flop having a clock input terminal coupled to an output of said first AND gate; a second AND gate having a first input terminal coupled to a second one of said externally actuated switches and a second input terminal coupled to an output of said first flip-flop; a second flip-flop having a clock input terminal coupled to an output of said second AND gate; a third AND gate having a first input terminal coupled to the inverse of said output of the first flip-flop and having a second input terminal coupled to an output of said second flip-flop; a third flip-flop to produce a detection signal, having a clock terminal coupled to an output of said third AND gate and having an inverted output coupled to a second input terminal of said first AND gate; a fourth AND gate, for producing said selection control signal, having a first input terminal coupled to said first one of said externally actuated switches and a second input terminal coupled to receive said detection signal; a fifth AND gate, for producing said setting signal, having a first input terminal coupled to said second one of said externally actuated switches and having a second input terminal coupled to receive said detection signal; an OR gate having first, second and third input terminals coupled to output of said third, fourth and fifth AND gates, respectively; a timer circuit having a control terminal coupled to receive an output of said OR gate; and a differentiator circuit coupled to an output of said timer circuit and having an output connected to reset terminals of said first, second and third flip-flops.
Claim 2
Dependent Claim
336 words
An electronic timepiece having timekeeping means for producing time information, time display means for displaying said time information, a casing including a transparent face plate disposed to cover said time display means, and setting means comprising: a plurality of externally actuated touch-sensitive switches; a first AND gate having a first input terminal coupled to a first one of said externally actuated switches; a first flip-flop having a clock input terminal coupled to an output of said first AND gate; a second AND gate having a first input terminal coupled to a second one of said externally actuated switches and a second input terminal coupled to an output of said first flip-flop; a second flip-flop having a clock input terminal coupled to an output of said second AND gate; a third AND gate having a first input terminal coupled to the inverse of said output of the first flip-flop and having a second input terminal coupled to an output of said second flip-flop; a third flip-flop to produce a detection signal, having a clock terminal coupled to an output of said third AND gate and having an inverted output coupled to a second input terminal of said first AND gate; a fourth AND gate, for producing said selection control signal, having a first input terminal coupled to said first one of said externally actuated switches and a second input terminal coupled to receive said detection signal; a fifth AND gate, for producing said setting signal, having a first input terminal coupled to said second one of said externally actuated switches and having a second input terminal coupled to receive said detection signal; an OR gate having first, second and third input terminals coupled to output of said third, fourth and fifth AND gates, respectively; a timer circuit having a control terminal coupled to receive an output of said OR gate; and a differentiator circuit coupled to an output of said timer circuit and having an output connected to reset terminals of said first, second and third flip-flops.
Claim 3
Dependent Claim
26 words
An electronic timepiece according to claim 1, in which each of said touch-sensitive switches includes an electrode formed upon a surface of said transparent face plate.
Claim 4
Dependent Claim
16 words
An electronic timepiece according to claim1, in which said time display means comprises an electro-optical display.
Claim 5
Dependent Claim
25 words
An electronic timepiece according to claim 1, in which said time display means comprises a dial and time indicating hands driven by a stepping motor.
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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |