Optical pickup device and optical element used for the same
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United States of America Patent
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Feb 12, 2008
Grant Date -
Jun 14, 2007
app pub date -
Feb 5, 2007
filing date -
Aug 30, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical pickup device, comprises light sources to emit a first light flux having a wavelength .lamda.1 (380 nm<.lamda.1<450 nm); a second light flux having a wavelength .lamda.2 (600 nm<.lamda.2<700 nm); and a light-converging optical system. The light-converging optical system converges the first light flux on a first optical information recording medium through a protective layer having a thickness t1 and the light-converging optical system converges the second light flux on a second optical information recording medium through a protective layer having a thickness t2. The light-converging optical system forms a first spot on the information recording surface of the first optical information recording medium by using N-th order diffracted light ray generated, and the light-converging optical system forms a second spot on the information recording surface of the second optical information recording medium by using M-th order (M.noteq.N) diffracted light ray generated.
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