Objective lens device including an objective lens and a transpar

Details Objective lens device including an objective lens and a transpar Objective lens device including an objective lens and a transpar

1997-02-13

1999-02-09

Chan, Eddie P.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4424, 369118, 369 94, G11B 700

Patent

active

058703691

ABSTRACT:
An objective lens device having two light control surfaces and an optical pickup able to adopt disks having different thicknesses as a recording medium. The objective lens device includes an objective lens arranged along an optical path parallel to the disks, and first and second control portions formed in a light incident surface of the objective lens, a light emitting surface thereof, or an extra transparent member. Therefore, two disks having different thicknesses are compatible as a recording medium, and light interference occurring when using a thick disk can be decreased.

REFERENCES:
patent: 4460990 (1984-07-01), Opheij
patent: 5072437 (1991-12-01), Chjkuma
patent: 5231624 (1993-07-01), Finegan
patent: 5657305 (1997-08-01), Sasaki et al.
patent: 5665957 (1997-09-01), Lee et al.

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