US3781086A
Expired / Lapsed
US
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Domain switching element and method of producing the same
Assignee: Hitachi Ltd
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Filing: 1972-06-27
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Granted: 1973-12-25
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Expires: 1992-06-27
Abstract
Abstract A domain switching element using a plate of an irregular ferroelectric crystal cut perpendicularly to the ferroelectric axis of the crystal and having nucleus domains of multiple domain structure provided on both the sides of the switching region of the element in the direction <110> of the crystal, the nucleus domains extending along the direction <110>. The area of single domain having a predetermined polarity can be arbitrarily controlled in response to the polarity of the threshold voltage applied to the switching region.
Inventors
- 👤 A Kumada
- 👤 S Ashida
- 👤 S Nonogaki
- 👤 Y Onishi
- 👤 H Ogawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:55
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/025; G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/05; G11; G11C; G11C13/00; G11C13/04; G11C13/047
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
130 words
A domain witching element comprising an irregular ferroelectric crystal plate consisting of a switching region, a first nucleus domain extending along the direction <110> of said irregular ferroelectric crystal which domain is a strain layer having a multiple-domain structure and disposed on one end surface of said plate, and a second nucleus domain extending along the direction <110> of said crystal which domain is strain layer having a multiple-domain structure and disposed on the other end surface of said plate, said first and second nucleus domains being isolated from each other, a pair of electrodes disposed on the two opposite planes of said crystal plate perpendicular to the ferro-electric axis of said crystal, and a power source for applying a voltage to said switching region through said pair of electrodes.
Claim 2
Dependent Claim
130 words
A domain witching element comprising an irregular ferroelectric crystal plate consisting of a switching region, a first nucleus domain extending along the direction <110> of said irregular ferroelectric crystal which domain is a strain layer having a multiple-domain structure and disposed on one end surface of said plate, and a second nucleus domain extending along the direction <110> of said crystal which domain is strain layer having a multiple-domain structure and disposed on the other end surface of said plate, said first and second nucleus domains being isolated from each other, a pair of electrodes disposed on the two opposite planes of said crystal plate perpendicular to the ferro-electric axis of said crystal, and a power source for applying a voltage to said switching region through said pair of electrodes.
Claim 3
Dependent Claim
45 words
A domain switching element according to claim 1, wherein the portions of said first and second nucleus domains in the vicinity of said switching region have the same polarization directions as those in the corresponding portions of said switching region close to said nucleus domains.
Claim 4
Dependent Claim
63 words
A domain switching element according to claim 1, wherein said crystal plate is made of such a compound having a crystal structure similar to that of gabolinium molybdate as expressed by a formula (RxR''1 x)2O3.3Mo1 eWeO3, where R and R'' are individual rare earth elements, x various in the range from 0 to 1.0, and e in the range from 0 to 0.2.
Claim 5
Dependent Claim
63 words
A domain switching element according to claim 2, wherein said crystal plate is made of such a compound having a crystal structure similar to that of gadolinium molybdate as expressed by a formula (RxR''1 x)2O3.3Mo1 eWeO3, where R and R'' are individual rare earth elements, x varies in the range from 0 to 0.1, and e in the range from 0 to 0.2.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |