Objective lens for optical pickup

Details Objective lens for optical pickup Objective lens for optical pickup

1987-08-27

1989-04-11

Corbin, John K.

G02B 302

Patent

active

048200298

ABSTRACT:
An ojective lens for use in an optical pickup that is employed in a compact disk player, for example. The objective lens has a first aspherical surface on which parallel light rays impinge and a second spherical surface that faces the disk. The aspherical surface lies in a meridian plane of a cartesian coordinate system. The X-axis of this coordinate system is taken on the optical axis, the Y-axis is taken at the apex of the aspherical surface. The aspherical surface which is axially symmetrical is given by

REFERENCES:
patent: 4571034 (1986-02-01), Nakamura
patent: 4657352 (1987-04-01), Suda et al.

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