US4011001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal device
Assignee: Seiko Instruments Inc
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Filing: 1975-03-14
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Granted: 1977-03-08
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Expires: 1995-03-14
Abstract
Abstract A liquid crystal device comprises a liquid crystal element disposed in a cavity formed between a pair of transparent base plates which have a circular shape. One or more cut-out or recess portions are formed at the side edge of said base plates, and a light source is mounted within the recess portion whereby the display face of said liquid crystal device is illuminated by said light source.
Inventors
- 👤 Tokio Moriya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:58
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/0001; G02B6/0011; G02B6/0033; G02B6/0035; G02B6/0036; G02B6/0056; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133615; G04; G04G; G04G9/00; G04G9/0023; G04G9/0029; G04G9/0035; G02B6/005; G02B6/0055; G02F1/137; G02F1/13743; G02F1/1375; G02F1/139
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
82 words
A liquid crystal device for use in watches and the like comprising: first and second transparent base plates disposed in superposed spaced-apart relationship; a liquid crystal element sandwiched between said first and second base plates; means defining a recess in the peripheral side edge of said second base plate and said liquid crystal element; a light source disposed within said recess for illuminating said liquid crystal element; and means for directing light emitted from said light source toward said liquid crystal element.
Claim 2
Dependent Claim
82 words
A liquid crystal device for use in watches and the like comprising: first and second transparent base plates disposed in superposed spaced-apart relationship; a liquid crystal element sandwiched between said first and second base plates; means defining a recess in the peripheral side edge of said second base plate and said liquid crystal element; a light source disposed within said recess for illuminating said liquid crystal element; and means for directing light emitted from said light source toward said liquid crystal element.
Claim 3
Dependent Claim
65 words
A liquid crystal device according to claim 1; wherein said means for directing light emitted from said light source toward said liquid crystal element comprises a reflective plate composed of transparent material attached to the backside of said second base plate, said reflective plate having at one side a roughened face facing said second base plate and at the other side a mirrored reflective face.
Claim 4
Dependent Claim
44 words
A liquid crystal device according to claim 1; wherein said first and second base plates have a circular shape; and wherein said means defining a recess comprises a cut-out portion of said second base plate thereby forming a recess behind said first base plate.
Claim 5
Dependent Claim
51 words
A liquid crystal device according to claim 1; further including a plurality of electrodes disposed on the face of said first base plate which faces said liquid crystal element, said electrodes terminating in electrode terminals which extend radially outwardly in circumferentially spaced-apart relationship toward the periphery of said first base plate.
Claim 6
Dependent Claim
42 words
A liquid crystal device according to claim 4; wherein the size of said recess relative to the size of said light source is such that the thickness of said liquid crystal device is not increased by the presence of said light source.
Claim 7
Dependent Claim
36 words
A liquid crystal device according to claim 5; wherein said means for directing light emitted from said light source toward said liquid crystal element comprises a reflective face on the backside of said second base plate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |