Patent US4046455A successfully refreshed from Google Patents.
US4046455A
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US
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Irregular ferroelectric element devised for motion of plural domain-walls
Assignee: Hitachi Ltd
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Filing: 1975-10-29
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Granted: 1977-09-06
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Expires: 1995-10-29
Abstract
Abstract An element in which only a single domain-wall can move sidewise, having a crystal plate of an irregular ferroelectric which is cut in the Z-plane at opposite surfaces and is then cut or cleaved in the <110> direction at its periphery and transparent electrodes for the polarization reversal provided at the central portions of the opposite Z-planes. The element includes at least a domain configuration such that two nucleus regions of opposite polarities are disposed on opposite sides of the region, i.e., a domain having a stationary polarity, where the electrodes are provided.
Inventors
- 👤 Akio Kumada
- 👤 Hiroshi Takano
- 👤 Yoshizumi Eto
- 👤 Masao Hibi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:48
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/025; G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/05
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
An optical slit unit which employs an irregular ferroelectric element comprising: a crystal Z-plate of irregular ferroelectric material having a pair of opposing surfaces bounded by the sides of the plate, at least a pair of which sides opposing one another being cut in the <110> direction; and means, coupled to said pair of opposing surfaces, for reversing the state of polarization of said plate; and wherein said plate has a domain configuration such that said plate includes a central nucleus-region of a prescribed polarity and two side nucleus-regions having a polarity opposite that of said central nucleus-region and being disposed on opposite sides of said central nucleus-region, with a respective domain growth wall interposed between said central nucleus-region and each of said side nucleus-regions.
Claim 2
Dependent Claim
125 words
An optical slit unit which employs an irregular ferroelectric element comprising: a crystal Z-plate of irregular ferroelectric material having a pair of opposing surfaces bounded by the sides of the plate, at least a pair of which sides opposing one another being cut in the <110> direction; and means, coupled to said pair of opposing surfaces, for reversing the state of polarization of said plate; and wherein said plate has a domain configuration such that said plate includes a central nucleus-region of a prescribed polarity and two side nucleus-regions having a polarity opposite that of said central nucleus-region and being disposed on opposite sides of said central nucleus-region, with a respective domain growth wall interposed between said central nucleus-region and each of said side nucleus-regions.
Claim 3
Dependent Claim
58 words
An optical slit unit according to claim 1, further comprising a pair of polarizing elements disposed in parallel, spaced apart in relation to each other, and a quarter-wave plate, said Z-plate, said pair of polarizing elements and said quarter-wave plate being disposed optically in series, with said Z-plate and said quarter-wave plate being disposed between said polarizing elements.
Claim 4
Dependent Claim
30 words
An optical slit unit according to claim 1, wherein said Z-plate has two pairs of opposing sides defining a rectangularly shaped plate, each side being cut in the <110> direction.
Claim 5
Dependent Claim
32 words
An optical slit unit according to claim 3, wherein said means comprises a pair of transparent electrodes formed on said opposing surfaces, and a voltage source electrically connected to said transparent electrodes.
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) | 1980-09-05 | 1981-03-07 | 1981-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-05 | 1985-03-07 | 1985-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-05 | 1989-03-07 | 1989-09-06 | $7700.00 | Window Closed / Lapsed |