Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Patent
1990-07-05
1992-05-05
Levy, Stuart S.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
369112, 385 7, 385 33, G11B 7135, G11B 709, G02B 612
Patent
active
051114470
ABSTRACT:
A photo-pickup wherein a light emitting portion, a surface acoustic wave generating portion, a lens portion, a light receiving portion and a control portion are integrally integrated on a base plate formed on its surface with a light transmission path. The light emitting portion propagates a light beam to the light transmission path. The light beam propagating in the light transmission path is first deflected within a plane of the light transmission path by surface acoustic wave propagating on the light transmission path and propagated towards the lens portion. The lens portion is provided to project the light beam outside from the light transmission path and effect two-dimentional focusing of the projected beam and adjustment of focal position. The light receiving portion comprises a combination of a plurality of light receiving elements disposed at suitable intervals from the projected position of the light beam to receive a reflected light of the light beam. The control portion is provided to receive an output of the light receiving portion to process a signal and supply said control signal to the surface acoustic wave generating portion and lens portion, thereby effecting the control of deflection angle of the light beam, two-dimensional focusing of the projected beam and control of focal position.
REFERENCES:
patent: 3325023 (1984-01-01), Matsumoto et al.
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patent: 4253723 (1981-03-01), Kojima et al.
patent: 4286838 (1981-09-01), Huignard et al.
patent: 4478483 (1984-10-01), Spraque
patent: 4747090 (1988-05-01), Yamashita et al.
Takizawa, Electroptic Fresnel Lens-Scanner With An Array of Channel Waveguides, Applied Optics, vol. 22, No. 16, Aug. 15, 1983, pp. 2468-2473.
Inoue Nobuhisa
Kazuhiko Mori
Matano Masaharu
Taguchi Isao
Yamashita Tsukasa
Levy Stuart S.
Omron Tateisi Electronics Co.
Tomassini James E.
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