Optical pickup for reading or recording information on a recordi

Details Optical pickup for reading or recording information on a recordi Optical pickup for reading or recording information on a recordi

1996-03-06

1999-04-06

Huber, Paul W.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369109, G11B 700

Patent

active

058927484

ABSTRACT:
An optical pickup reads or records information on a recording surface of a first optical record medium or a second optical record medium, each of which has a protection film different in thickness from each other. The optical pickup includes: a light beam source for emitting a light beam; a dividing unit for dividing the light beam into a non-diffracted light, which is a portion of the light beam other than diffracted lights, and a first order diffracted light; and a converging unit for converging the non-diffracted light and the first order diffracted light. Further, an optical path length between the light beam source and the converging unit is determined so that the non-diffracted light is converged onto the recording surface of the first optical record medium and a spherical aberration of the non-diffracted light converged onto the recording surface of the first optical record medium is minimized. And the dividing unit is constructed so that the first order diffracted light is converged onto the recording surface of the second optical record medium and a spherical aberration of the first order diffracted light converged onto the recording surface of the second optical record medium is minimized.

REFERENCES:
patent: 5526338 (1996-06-01), Hasman et al.

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