Objective lens for optical memory device

Details Objective lens for optical memory device Objective lens for optical memory device

1989-08-02

1990-05-15

Sugarman, Scott J.

G02B 1318

Patent

active

049252836

ABSTRACT:
An objective lens for an optical memory device comprising a plane surface on one side thereof for emitting a luminous flux oppositely to a disk, and an aspherical surface on the other of the side thereof for receiving a luminous flux reversely to the disk in such a manner that the following conditions (1) and (2) are satisfied:

REFERENCES:
patent: 4571034 (1986-02-01), Nakamura
patent: 4595264 (1986-06-01), Nakamura
patent: 4657352 (1987-04-01), Suda et al.
patent: 4668055 (1987-05-01), Nishi et al.
patent: 4863248 (1989-09-01), Saka

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