Optical disc player lens

Details Optical disc player lens Optical disc player lens

1987-04-23

1988-05-10

Arnold, Bruce Y.

G02B 302

Patent

active

047430931

ABSTRACT:
A lens for use in optical disc players comprising a single biconvex element having both surfaces aspheric. The refractive index, N.sub.D, of the element at 589.3 nm is 1.492 and at the same wavelength the Abbe V number is 57.4. At 800 nm the refractive index, N.sub.800, of the element is 1.48584. Each surface may be described by the equation: ##EQU1## wherein: X is the sag of the aspheric surface from a plane reference surface at a radial distance Y from the axis of the lens.

REFERENCES:
patent: 4415238 (1983-11-01), Braat et al.
patent: 4449792 (1984-05-01), Arai et al.
patent: 4571034 (1986-02-01), Nakamura

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