Patent US3965455A successfully refreshed from Google Patents.
US3965455A
Expired / Lapsed
US
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Focused arc beam transducer-reflector
Assignee: United States Department of the Navy
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Filing: 1974-04-25
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Granted: 1976-06-22
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Expires: 1994-04-25
Abstract
Abstract An acoustic transducer-reflector using a single disc-shaped piezoceramic element radiating into a compound reflector for obtaining a line focus sound beam that is characteristic of focused-arc transducers that maybe used for underseas applications and for non-destructive materials testing. The single transducer emits acoustic energy into the compound reflector which reshapes a circular beam into a focused arc beam. A shadow mask or aperture stop positioned in front of the reflector assures a beam such as would be radiated from a ring source.
Inventors
- 👤 Michael J. Hurwitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:51
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18; G10K11/26; G10K11/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
140 words
An acoustic transducer-reflector for simulating a focused-arc beam comprising: a disc-shaped transducer mounted forward of and concentrically with the transducer-reflector for radiating a beam of acoustic wave energy rearward toward the reflector; compound reflector means attached behind said disc transducer for producing an emitted wavefront simulating that which would be radiated by a ring source to produce a line focus with great depth of field, said reflector means including a conical reflector concentrically behind said transducer for reflecting the acoustic waves radially outward, and a surface of revolution reflector, made of a truncated parabola for simulating a real-image ring source, concentric with and positioned radially outward from said conical reflector; and an aperture stop disc with an annular slot positioned forward of and concentric with said surface of revolution reflector and in the focal plane of the real-image ring source.
Claim 2
Dependent Claim
140 words
An acoustic transducer-reflector for simulating a focused-arc beam comprising: a disc-shaped transducer mounted forward of and concentrically with the transducer-reflector for radiating a beam of acoustic wave energy rearward toward the reflector; compound reflector means attached behind said disc transducer for producing an emitted wavefront simulating that which would be radiated by a ring source to produce a line focus with great depth of field, said reflector means including a conical reflector concentrically behind said transducer for reflecting the acoustic waves radially outward, and a surface of revolution reflector, made of a truncated parabola for simulating a real-image ring source, concentric with and positioned radially outward from said conical reflector; and an aperture stop disc with an annular slot positioned forward of and concentric with said surface of revolution reflector and in the focal plane of the real-image ring source.
Claim 3
Dependent Claim
16 words
The acoustic transducer-reflector of claim 1 wherein said conical reflector has a half-angle of approximately 50°.
Claim 4
Dependent Claim
41 words
The acoustical transducer-reflector of claim 2 further comprising: a plurality of struts connecting said transducer to said reflector; said transducer radiating its beam of acoustic wave energy rearwardly into said conical reflector; and said aperture stop disc attached to said transducer.
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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) | 1979-06-22 | 1979-12-22 | 1980-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-22 | 1983-12-22 | 1984-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-22 | 1987-12-22 | 1988-06-22 | $7700.00 | Window Closed / Lapsed |