Objective Optical System and Optical Information Recording/Reproducing Device Having the Same
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United States of America Patent
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Issued Date -
Jun 5, 2008
app pub date -
Dec 3, 2007
filing date -
Dec 4, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
There is provided an objective optical system which includes a chromatic aberration correction element having a negative power first lens and a positive power second lens, materials of the first and lenses being different from each other, the first and second lenses being cemented together via a cementing surface to correct a longitudinal chromatic aberration, at least one phase shift surface configured to give a predetermined optical path length difference to a first light beam, and an objective lens. Each of the chromatic aberration correction element and the at least one phase shift surface is located along an optical path common to the first and second light beams. The chromatic aberration correction element is located on a light source side with respect to the objective lens.
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