Optical head device for recording/reproduction for recording med

Details Optical head device for recording/reproduction for recording med Optical head device for recording/reproduction for recording med

1993-02-02

1994-03-15

Young, W. R.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4437, 369 58, G11B 7095

Patent

active

052951251

ABSTRACT:
There is disclosed an optical head device in which at least two laser beams having different wavelengths are converged as light spots on a recording medium or optical disk by use of one objective lens and one of the two laser beams is subjected to a focusing control while the recording or reproduction of a signal on or from the optical disk is made using the other laser beam. When the one laser beam is subjected to the focusing control, the deviation of a converging position of the other laser beam for the optical disk may occur due to a difference in refractive index between transparent substrates of plural kinds of optical disks. In such a case, the converging position of the other laser beam is displaced to cancel the amount of deviation.

REFERENCES:
patent: 4549287 (1985-10-01), Hatano et al.
patent: 4841510 (1989-06-01), Yoshizawa
patent: 5042020 (1991-08-01), Endo
patent: 5097464 (1992-03-01), Nishiuchi et al.
patent: 5235581 (1993-08-01), Miyagawa et al.

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