Optical head and tracking method using same

Details Optical head and tracking method using same Optical head and tracking method using same

1988-12-20

1991-10-29

McElheny, Jr., Donald

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4412, G11B 700

Patent

active

050620967

ABSTRACT:
An optical head usable also with a WORM-type optical disk device includes a diffracting optical system which is located in the optical path of a light beam and which diffracts the light beam so as to produce at least three diffracted light beams, and three light-receiving elements which receive the reflected light beams of the three diffracted light beams from the surface of an optical disk. The diffracting optical system is arranged so as to establish a positional relationship in which the three or more diffracted light beams do not lie on a single straight line in the cross-sectional distribution thereof. Among the three diffracted light beams, one lying at the foremost or rearmost position in the forward rotating direction of the optical disk is employed for generating a focusing servo signal or for reading or writing data, and the remaining two are employed for generating a tracking servo signal.

REFERENCES:
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patent: 4498159 (1985-02-01), Daimon
patent: 4532522 (1985-07-01), Tsunoda et al.
patent: 4720825 (1988-01-01), Kokado
patent: 4753513 (1988-06-01), Shikama
patent: 4817072 (1989-03-01), Toide et al.
Patent Abstracts of Japan, vol. 8, No. 72, Apr. 4, 1984; JP-A-58 218033, Dec. 19, 1983.
Patent Abstracts of Japan, vol. 7, No. 286, Dec. 21, 1983; JP-A-58 161154, Sep. 24, 1983.
Patent Abstracts of Japan, vol. 11, No. 45, Feb. 10, 1987, JP-A-61 214240, Sep. 24, 1986.

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