Aberration compensating optical element, optical system, optical pickup device, recorder and reproducer
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United States of America Patent
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Mar 8, 2005
Issued Date -
N/A
app pub date -
Dec 5, 2003
filing date -
Jul 11, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An aberration compensating optical element includes: a diffractive structure having a plurality of ring-shaped zone steps formed into substantially concentric circles on at least one surface of the aberration compensating optical element; wherein the aberration compensating optical element is adapted for being disposed on an optical path between a light source for emitting a light having a wavelength of not more than 550 nm, and an objective lens made of a material having an Abbe constant of not more than 95.0 at a d-line; and wherein the following inequality is satisfied: P.sub..lambda.1
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