Focusing detection optical path for an optical information proce

Details Focusing detection optical path for an optical information proce Focusing detection optical path for an optical information proce

1990-03-29

1992-10-06

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4424, 369110, G11B 700

Patent

active

051538644

ABSTRACT:
In an optical system, a light beam is converged on an optical disk and the light beam reflected from the optical disk passes through the objective lens and guided to a convex lens made of a refractive material having a first relatively large refractive index. The light beam is converged by the convex lens and divided by a half prism into a transmitted light beam and a reflected light beam. The reflected light beam is detected by a photodetector and converted into a tracking signal. The transmitted light beam is guided to a concave lens made of a refractive material having a second refractive index smaller than the first refractive index so that a divergent power is applied to the transmitted light beam from the concave lens. The converged light beam from the concave lens is detected by a photodetector and converted into a focusing signal. The objective lens is controlled in accordance with the focusing and tracking signals so that the objective lens is maintained in focusing and tracking states.

REFERENCES:
patent: 4712205 (1987-12-01), Smid et al.
patent: 4764912 (1988-08-01), Ando et al.
patent: 4900910 (1990-02-01), Doi
Patent Abstract of Japan, vol. 13, No. 19, Jan. 18, 1989.
Patent Abstract of Japan, vol. 5, No. 60, Apr. 23, 1981.
Patent Abstract of Japan, vol. 10, No. 312, Oct. 23, 1986.
Patent Abstract of Japan, vol. 12, No. 225, Jun. 28, 1988.

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