US3766615A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of polarizing piezoelectric elements
Assignee: Denki Onkyo Co Ltd
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Filing: 1970-09-02
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Granted: 1973-10-23
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Expires: 1990-09-02
Abstract
Abstract A piezoelectric element is polarized by applying electroconductive rubber pads on the opposite surfaces of the low voltage driving portion and on the end surface of the high voltage output portion and by applying DC polarization voltages across these pads while the element is being maintained in insulating oil.
Inventors
- 👤 M Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:07
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H04; H04R; H04R17/00; H10; H10N; H10N30/00; H10N30/01; H10N30/04; H10N30/045; H10N30/40; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
143 words
A method of manufacture of piezoelectirc voltage converting devices comprising the steps of removably clamping the low voltage driving portion of a piezoelectric element between electroconductive, heat and oil resistant rubber pads which extend over the entire area of said driving portion to be polarized, urging another electroconductive, heat and oil resistant rubber pad against the end surface of the high voltage output portion of said element, immersing said element with said rubber pads in heated insulating oil, applying high polarization DC voltages across said rubber pads on said low voltage driving portion and between said rubber pads on said low voltage driving portion and said rubber pad on said high voltage output portion while said element is being immersed in said insulating oil for a period of time to effect polarization and removing said pads from said element after polarization is achieved.
Claim 2
Independent Claim
143 words
A method of manufacture of piezoelectirc voltage converting devices comprising the steps of removably clamping the low voltage driving portion of a piezoelectric element between electroconductive, heat and oil resistant rubber pads which extend over the entire area of said driving portion to be polarized, urging another electroconductive, heat and oil resistant rubber pad against the end surface of the high voltage output portion of said element, immersing said element with said rubber pads in heated insulating oil, applying high polarization DC voltages across said rubber pads on said low voltage driving portion and between said rubber pads on said low voltage driving portion and said rubber pad on said high voltage output portion while said element is being immersed in said insulating oil for a period of time to effect polarization and removing said pads from said element after polarization is achieved.
Claim 3
Dependent Claim
50 words
The method according to claim 1 which further comprises the steps of removing said rubber pads after polarization and applying electrodes to a portion of the surfaces previously contacted by said pads for connecting lead wires to said driving and output portions whereby to obtain a piezoelectric voltage converting device.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |