US4412147A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic holography imaging device having a macromolecular piezoelectric element transducer
Assignee: Kureha Corp
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Filing: 1980-11-04
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Granted: 1983-10-25
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Expires: 2000-11-04
Abstract
Abstract An ultrasonic image device such as may be used in a holography system or scanning system and having a piezoelectric transducer in which the conversion efficiency and phase are substantially constant over a wide frequency range. A piezoelectric sheet 5 μm to 1000 μm thick is used for a piezoelectric element. The piezoelectric sheet is constructed of a macromolecular material including polymers and copolymers of polar monomers. A high frequency signal input device applies to the electrodes coupled to the piezoelectric sheet high frequency signals of different frequencies in a range around a fundamental resonance of the piezoelectric sheet of ±10 to ±70% of the fundamental resonance frequency.
Inventors
- 👤 Masato Nagura
- 👤 Kazushige Kikuchi
- 👤 Hiroshi Obara
- 👤 Yasushi Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:08
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0688; H; H04; H04R; H04R17/00; H04R17/005; Y; Y10; Y10S; Y10S310/00; Y10S310/80
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
An ultrasonic holography imaging device comprising; a transducer having a macromolecular piezoelectric sheet with a thickness in the range of 3 μm to 1000 μm; a high frequency signal sweeping device for applying an oscillation high frequency signal to said transducer while changing its frequency sequentially continuously or stepwise, wherein a plurality of high frequencies in the range of from 0.3 f 0 to 0.9 f 0 or 1.1 f 0 to 1.7 f 0 are inputted to said transducer by said high frequency signal sweeping device, where; l is the thickness of a piezoelectric sheet, v is an acoustic velocity in said piezoelectric sheet, and f 0 is a fundamental resonance frequency expressed by v/2l.
Claim 2
Dependent Claim
116 words
An ultrasonic holography imaging device comprising; a transducer having a macromolecular piezoelectric sheet with a thickness in the range of 3 μm to 1000 μm; a high frequency signal sweeping device for applying an oscillation high frequency signal to said transducer while changing its frequency sequentially continuously or stepwise, wherein a plurality of high frequencies in the range of from 0.3 f 0 to 0.9 f 0 or 1.1 f 0 to 1.7 f 0 are inputted to said transducer by said high frequency signal sweeping device, where; l is the thickness of a piezoelectric sheet, v is an acoustic velocity in said piezoelectric sheet, and f 0 is a fundamental resonance frequency expressed by v/2l.
Claim 3
Dependent Claim
28 words
The device as claimed in claim 1 wherein said piezoelectric sheet is constructed of a material selected from the group consisting of polymers and copolymers of polar monomers.
Claim 4
Dependent Claim
31 words
The device as claimed in claim 1 wherein said piezoelectric sheet is constructed from at least one material selected from the group consisting of vinylidene fluoride, vinyl fluoride, trifluoroethylene and fluorochlorovinylidene.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-24 | 1987-04-25 | 1987-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-24 | 1991-04-25 | 1991-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-24 | 1995-04-25 | 1995-10-25 | $7700.00 | Window Closed / Lapsed |