Integral pickup for an optical digital disc using saw deflection

Details Integral pickup for an optical digital disc using saw deflection Integral pickup for an optical digital disc using saw deflection

1983-10-13

1988-05-24

Cardillo, Raymond F.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 46, 369112, 350 9613, G11B 7135, G11B 709, G02B 612

Patent

active

047470909

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 beram 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-dimentional focusing of the projected beam and control of focal position.

REFERENCES:
patent: 4425023 (1984-01-01), Matsumoto et al.
patent: 4478483 (1984-10-01), Sprague
Takizawa, Electrooptic Fresnel Lens-Scanner with an Array of Channel Waveguides, Applied Optics, vol. 22, No. 16, Aug. 15, 1983, pp. 2,468-2,473.

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