Optical disk drive having functions of detecting disk tilt from

Details Optical disk drive having functions of detecting disk tilt from Optical disk drive having functions of detecting disk tilt from

1994-11-15

1996-06-04

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4441, 369 54, 369109, G11B 7095

Patent

active

055239897

ABSTRACT:
An optical disk drive of the present invention includes: a light source for emitting a light beam; an optical system for radiating the light beam onto a desired track formed on an optical disk; a light receiving element for receiving the light beam reflected by the optical disk; and a signal processing circuit for detecting an optical reproduced signal representing information stored in the desired track and control signals for accurately radiating the light beam onto the desired track, in accordance with a light amount of the received light beam, wherein the light receiving element includes first and second light receiving portions, the first light receiving portion receives a part of interference light beams resulting from an interference between a zero-order diffracted light beam and .+-. first-order diffracted light beams diffracted by the track among the light beam reflected by the optical disk, and the second light receiving portion receives a remaining part of the interference light beams; and wherein the signal processing circuit detects a tilt amount of the optical disk in a radial direction based on a light amount of a light beam received by the first light receiving portion and that received by the second light receiving portion.

REFERENCES:
patent: 4674078 (1987-06-01), Otsuka et al.
patent: 5065380 (1991-11-01), Yokota
patent: 5206848 (1993-04-01), Kusano et al.
patent: 5216649 (1993-06-01), Koike et al.
patent: 5408320 (1995-04-01), Katagiri et al.

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