Optical head for recording and playing from optical disc

Details Optical head for recording and playing from optical disc Optical head for recording and playing from optical disc

1997-09-12

2000-06-27

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, G11B 700

Patent

active

060814888

ABSTRACT:
The configuration of an optical head is such that it enables movement of and setting of the position of a laser light source along an optical axis to either a first position which corresponds to the position for which an objective lens is designed to accommodate an optical disc having a first substrate thickness, and a third position which is between the first position and a second position at which the aberration with respect to an optical disc having a second substrate thickness, which is different than that of the first optical disc, is minimum. By establishing this third position as a position at which not only is there a reduction in aberration with respect to the second optical disc, but also at which there is no significant reduction in the allowable amount of lateral skew of the laser light source from the optical axis, it is possible to prevent a significant worsening of aberration characteristics, even if the laser light source is skewed from the optical axis.

REFERENCES:
patent: 5615200 (1997-03-01), Hoshino et al.
patent: 5661711 (1997-08-01), Tanaka et al.
patent: 5703856 (1997-12-01), Hayashi et al.
patent: 5754513 (1998-05-01), Yagi et al.
patent: 5835473 (1998-11-01), Shimozono et al.
Keating, "Geometric, Physical, and Visual Optics", 1988, pp. 29-35.

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