Optical disk drive with an accurately positioned objective lens

Details Optical disk drive with an accurately positioned objective lens Optical disk drive with an accurately positioned objective lens

1988-12-23

1991-03-26

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, 360 7805, G11B 700

Patent

active

050035240

ABSTRACT:
An optical disk apparatus for reading and writing information on an optical disk having concentric tracks. The objective lens is accurately positioned in both a tracking mode and a coarse access mode. During the tracking mode, a tracking detector detects a light beam reflected off of the optical disk and generates a tracking error signal. During the coarse access mode, a position detector detects the position of the objective lens and generates a position signal. The position signal generated when the objective lens is in an initial position is stored, and the stored signal is compared with the signals generated during the coarse accessing mode to produce a signal which represents the difference between the initial position of the objective lens and the current position of the objective lens. A coil is operated to move the objective lens in both the tracking mode and the coarse accessing mode. During the tracking mode, the objective lens follows a track on the optical disk, and during the coarse accessing mode, the objective lens is held in the initial position.

REFERENCES:
patent: 4037252 (1977-07-01), Johanne et al.
patent: 4239942 (1980-12-01), Van Alem et al.
patent: 4513406 (1985-04-01), Ishihara
patent: 4615023 (1986-09-01), Inada et al.
patent: 4684797 (1987-08-01), Ando et al.
patent: 4736353 (1988-04-01), Kasai et al.
patent: 4769803 (1988-09-01), Yamamiya
patent: 4775903 (1988-10-01), Knowles
Proceedings of SPIE, vol. 421, Jun. 1983, pp. 136-142; Inada et al.; "Tracking Servo System with New Optical Head Locked Objective Lens", p. 137, line 36--p. 139, line 9; FIGS. 2, 6, 7.

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