Biaspherical single lens for an optical information recording-re

Details Biaspherical single lens for an optical information recording-re Biaspherical single lens for an optical information recording-re

1990-04-11

1990-12-25

Sugarman, Scott J.

G02B 1318

Patent

active

049798073

ABSTRACT:
A biaspherical single lens for an optical information recording-reproducing apparatus comprises a single lens forming an image through a substrate of thickness t and having its first and second surfaces both formed by an aspherical surface and in which when the distance from any point on the aspherical surface to the tangential plane of the vertex of the aspherical surface is X and the distance from said any point to the optic axis is H and the reference radius of curvature of the .nu.th surface is R.sub..nu. and the cone constant of the .nu.th surface is K.sub..nu. and the aspherical coefficient of the .nu.th surface is A.sub..nu.i (i=3, 4, . . . ), the aspherical surface is an aspherical surface expressed by the following equation and satisfies the following conditions (1), (2), (3) and (4): ##EQU1## where F is the focal length of the aspherical single lens, D is the thickness on the optic axis of the aspherical single lens, and N is the refractive index of the aspherical single lens for the wavelength used.

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patent: 4902113 (1990-02-01), Ishiwara
patent: 4902114 (1990-02-01), Arai

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