Optical scanning device with coarse and fine scanning control

Details Optical scanning device with coarse and fine scanning control Optical scanning device with coarse and fine scanning control

1995-03-03

1996-10-29

Neyzari, Ali

Dynamic information storage or retrieval

Storage or retrieval by simultaneous application of diverse...

Magnetic field and light beam

369 4423, 369 4429, 369 4432, G11B 700, G11B 1100

Patent

active

055703283

ABSTRACT:
An optical scanning device includes an object lens for focusing a light beam onto a recorded medium having a helical data track. A tracking regulation circuit guides the object lens along the data track. The tracking regulation circuit includes a coarse drive circuit for driving the optical scanning device and a fine drive circuit for adjusting the object lens. The optical scanning device and the object lens have optical axes which normally are aligned. Deviations of the optical axes from alignment are measured and regulation signals are generated for the coarse drive circuit in accordance with the deviations.

REFERENCES:
patent: 4507763 (1985-03-01), Kato
patent: 4686662 (1987-08-01), Baer
patent: 5173885 (1992-12-01), Iiyori et al.
patent: 5208792 (1993-05-01), Imanaka
patent: 5245597 (1993-09-01), Lee et al.
patent: 5412634 (1995-05-01), Buchler et al.
patent: 5452276 (1995-09-01), Bass

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