Diffraction type optical pickup lens and optical pickup apparatus using the same
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United States of America Patent
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Jul 4, 2006
Grant Date -
Sep 19, 2002
app pub date -
Feb 15, 2002
filing date -
Mar 14, 2001
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a diffraction type optical pickup lens, at least one surface of a convergent lens is formed with such an aspheric surface that a luminous flux having a wavelength .lamda..sub.1 is converged at a first predetermined position. At least one surface of the convergent lens is formed with a zone plate having such a wavelength selectivity that a luminous flux having a wavelength .lamda..sub.2 is converged at a second predetermined position whereas the luminous flux having a wavelength .lamda..sub.1 is transmitted therethrough as it is. The convergent lens is transparent to the luminous fluxes having the wavelengths .lamda..sub.1 and .lamda..sub.2.
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