Telegraphy – Systems – Simplex-reversing periodic
Patent
1975-01-27
1976-10-12
Konick, Bernard
Telegraphy
Systems
Simplex-reversing periodic
178 66DD, 178 67A, 1791003V, 350161, H04N 576, G11B 1100
Patent
active
039859525
ABSTRACT:
An elasto-optic device for providing periodic lateral displacement in a radial tracking servo system for a video disc player. A transparent prism is vibrated in either a flexural or a second harmonic extensional mode by a thin piezoelectric ceramic platelet attached to a side of the prism and energized by an oscillatory signal. Vibration occurs at a natural mechanical resonant frequency of the prism, and a linear strain distribution is established in the prism at its intersection with the path of the optical beam used for reading the record track. The substantially linear strain distribution effects a corresponding localized periodic change in the index of refraction of the prism material to provide lateral optical beam deflection without the use of moving parts.
REFERENCES:
patent: 3661441 (1972-05-01), Uchida
patent: 3673412 (1972-06-01), Olson
patent: 3795902 (1974-03-01), Russell
patent: 3836225 (1974-09-01), Wilde
patent: 3848095 (1974-11-01), Wohlmut
patent: 3874785 (1975-04-01), Huignard
patent: 3876842 (1975-04-01), Bouwhuis
"Application of Ultrasonic Standing Waves to the Generation of Optical-Beam Scanning", by Aas and Erf, The Journal of the Acoustical Society of America, vol. 36, No. 10, pp. 1906-1913, Oct. 1964.
Faber Alan
Konick Bernard
Pederson John J.
Zenith Radio Corporation
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