Optical pickup apparatus, objective lens, apparatus for reproducing and/or recording optical information recording medium
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Feb 3, 2004
Grant Date -
Jan 10, 2002
app pub date -
May 23, 2001
filing date -
May 24, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical pickup apparatus for at least two kinds of optical information recording media, comprises a first light source; a second light source; an optical converging system; and a photo detector. An optical element of the optical converging system comprises a first region including an optical axis and a second region adjoining the first region and locating at the outside of the first region, the first region is a refractive surface and the second region is a diffractive surface. When a first light flux passes through the second region, the light amount of n-th order diffracted ray of the first light flux is larger than that of any other order diffracted ray of the first light flux, and when a second light flux passes through the second region of the optical element, the light amount of n-th order diffracted ray of the second light flux is larger than that of any other order diffracted ray of the second light flux, where n is an integer except 0.
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