US3586120A
Expired / Lapsed
US
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Sound propagating apparatus
Assignee: Zenith Electronics LLC
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Filing: 1968-07-16
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Granted: 1971-06-22
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Expires: 1988-07-16
Abstract
Abstract Light-beam scanning angles obtainable from light-sound interaction are increased by introducing dispersion of the sound waves. In one general approach, the sound waves are passed through a fixed grating or otherwise through a medium which is dispersive by reason of its character. In another general approach, vibrational dispersion is obtained by launching a longitudinal wave in response to either a shear wave or an extensional wave.
Inventors
- 👤 Robert Adler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:01
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/29; G02F1/33
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
106 words
Sound propagating apparatus comprising: a strip of material constituting a first medium propagative of sound energy at a first velocity in the form of one of shear waves and extensional waves along a boundary thereof and means for developing said sound energy; a second medium having a boundary in common with a major surface of said strip and responsive to said one of the waves to propagate longitudinal waves at a velocity less than said first velocity, said boundary having a length corresponding to a number of wavelengths of said sound with the sound waves in said strip traveling along the entire length of the boundary.
Claim 2
Dependent Claim
106 words
Sound propagating apparatus comprising: a strip of material constituting a first medium propagative of sound energy at a first velocity in the form of one of shear waves and extensional waves along a boundary thereof and means for developing said sound energy; a second medium having a boundary in common with a major surface of said strip and responsive to said one of the waves to propagate longitudinal waves at a velocity less than said first velocity, said boundary having a length corresponding to a number of wavelengths of said sound with the sound waves in said strip traveling along the entire length of the boundary.
Claim 3
Dependent Claim
26 words
Apparatus as defined in claim 1 wherein said first medium has an impedance to the sound energy higher than the impedance thereto of said second medium.
Claim 4
Dependent Claim
38 words
Apparatus as defined in claim 1 wherein the velocity of travel of said sound waves in said second medium away from said boundary is small relative to the velocity of travel of said sound waves along said boundary.
Claim 5
Dependent Claim
47 words
Apparatus as defined in claim 2 wherein said developing means is a transducer which has an impedance to said sound energy high compared to the impedance of said second medium thereto and said first medium has an impedance thereto of a value intermediate the other two impedances.
Claim 6
Dependent Claim
23 words
Apparatus as defiNed in claim 2 in which said sound energy is propagated in said first medium in the form of shear waves.
Claim 7
Dependent Claim
39 words
Apparatus as defined in claim 5 wherein the longitudinal wave fronts form an angle Alpha to the shear-wave propagation direction approximately in accordance with where v1 and v2 are the propagation velocities of the shear and longitudinal waves, respectively.
Claim 8
Dependent Claim
36 words
Apparatus as defined in claim 5 wherein the cross section of said first medium tapers in the direction of propagation of said shear waves so as to become of decreasing width along the shear wave fronts.
Claim 9
Dependent Claim
29 words
Apparatus as defined in claim 7 in which the degree of taper is selected so that the energy in said shear waves remains uniformly distributed in said first medium.
Claim 10
Dependent Claim
74 words
Apparatus as defined in claim 7 wherein the angle B between said boundary and the normal to the longitudinal wave fronts is approximately in accordance with: where Z1 and Z2 are the impedances to the sound energy of said first and second mediums, respectively, and wherein j is the angle between said boundary and the shear wave fronts with where v1 and v2 are the propagation velocities of said shear and longitudinal waves, respectively.
Claim 11
Dependent Claim
25 words
Sound propagating apparatus as defined in claim 1 in which said sound energy is propagated in said first medium in the form of extensional waves.
Claim 12
Dependent Claim
35 words
Apparatus as defined in claim 10 in which the thickness of said strip in a direction perpendicular to said boundary is small compared to the length of said strip in the direction of sound travel.
Claim 13
Dependent Claim
28 words
Apparatus as defined in claim 10 wherein the thickness of said first medium is much smaller than the wavelength of a longitudinal wave of said sound energy therein.
Claim 14
Dependent Claim
30 words
Apparatus as defined in claim 10 wherein the thickness of said first medium approximates an integral number multiplied by one-half wavelength of a longitudinal wave of said sound energy therein.
Claim 15
Dependent Claim
45 words
Apparatus as defined in claim 10 wherein the angle Alpha between the extensional wave propagation direction and the longitudinal wave fronts is selected in accordance with: where v1 and v2 are the propagation velocities of said sound energy in said first and second mediums, respectively.
Claim 16
Dependent Claim
20 words
Apparatus as defined in claim 10 wherein said first medium is much smaller in its transverse dimensions than in length.
Claim 17
Dependent Claim
14 words
Apparatus as defined in claim 15 in which said first medium is a wire.
Claim 18
Dependent Claim
33 words
Apparatus as defined in claim 10 in which said developing means is a transducer coupled to said first medium and the latter tapers in thickness substantially exponentially from said transducer to said boundary.
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) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |