Optical disc player lens
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United States of America Patent
Stats
-
May 10, 1988
Issued Date -
N/A
app pub date -
Apr 23, 1987
filing date -
Sep 16, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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