Objective lens for recording and reproducing for use in an optic

Details Objective lens for recording and reproducing for use in an optic Objective lens for recording and reproducing for use in an optic

1996-10-22

1998-03-03

Hindi, Nabil

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 58, G11B 700

Patent

active

057243352

ABSTRACT:
An optical system includes a laser light source; an objective lens for converging luminous flux emitted from the laser light source onto an information recording surface of an optical information recording medium through a transparent substrate of the optical information recording medium; and lateral magnification change device for changing a lateral magnification of the objective lens from a first lateral magnification m.sub.1 to a second lateral magnification m.sub.2 which is less than m.sub.1 according to a thickness of the transparent substrate. An amount of an offense against sine condition SC(m.sub.1 :NA.sub.2) represented by the following expression for NA.sub.2 at the first lateral magnification m.sub.1 of the objective lens satisfies the following conditional expression,

REFERENCES:
patent: 5235581 (1993-08-01), Miyagawa et al.
patent: 5416757 (1995-05-01), Luecke et al.

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