Patent US4458170A successfully refreshed from Google Patents.
US4458170A
Expired / Lapsed
US
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Ultrasonic transmitter-receiver
Assignee: Panasonic Holdings Corp
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Filing: 1981-12-08
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Granted: 1984-07-03
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Expires: 2001-12-08
Abstract
Abstract An ultrasonic transmitter-receiver is characterized in that a diaphragm is disposed at the center of a laminated piezo-electric element and the periphery of the diaphragm is flexibly fixed in a housing through a buffer member of elastic rubber or the like in order to suppress mechanical oscillation.
Inventors
- 👤 Ryoichi Takayama
- 👤 Yukihiko Ise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:11
CPC Classifications
G; G10; G10K; G10K9/00; G10K9/12; G10K9/122
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
An ultrasonic transmitter-receiver comprising: a laminated piezo-electric element, a diaphragm at a central portion of said laminated piezo-electric element, a housing means for accommodating said laminated piezo-electric element therein, an elastic buffer member disposed in bridging contact between a peripheral portion of said diaphragm and an inner side wall of said housing, wherein said diaphragm is flexibly fixed and held within said housing through the use of said elastic buffer member, and an acoustic absorbent disposed on the bottom of said housing but spaced out of contact from said laminated piezo-electric element, whereby there is an improvement in pulse characteristics, such as rise time.
Claim 2
Dependent Claim
104 words
An ultrasonic transmitter-receiver comprising: a laminated piezo-electric element, a diaphragm at a central portion of said laminated piezo-electric element, a housing means for accommodating said laminated piezo-electric element therein, an elastic buffer member disposed in bridging contact between a peripheral portion of said diaphragm and an inner side wall of said housing, wherein said diaphragm is flexibly fixed and held within said housing through the use of said elastic buffer member, and an acoustic absorbent disposed on the bottom of said housing but spaced out of contact from said laminated piezo-electric element, whereby there is an improvement in pulse characteristics, such as rise time.
Claim 3
Dependent Claim
26 words
An ultrasonic transmitter-receiver as defined in claim 1 wherein said diaphragm is of a conical configuration and said laminated piezo-electric element is of a disc configuration.
Claim 4
Dependent Claim
24 words
An ultrasonic transmitter-receiver as defined in claim 2 wherein said conical diaphragm has a ratio of height to bottom diameter within 0.3 through 0.5.
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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |