Optical pickup head compatible with multiple optical recording media
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United States of America Patent
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Feb 26, 2008
Grant Date -
Apr 13, 2006
app pub date -
Mar 11, 2005
filing date -
Jul 9, 2004
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An optical pickup head compatible with multiple optical recording media includes three light sources, a prism unit disposed beside the light sources, a reflective multi-surface prism disposed beside the prism unit for multiple reflecting light beams therethrough, a collimating lens disposed beside the reflective multi-surface prism for collimating light beams there through, and an objective lens. The prism unit includes a first portion facing the first light source for passing the first light beam therethrough, a second portion facing the second light source for passing the second light beam therethrough, a third portion facing the third light source for passing the third light beam therethrough, a first aspherical surface for correcting aberrations of the first light beam caused by non-matching, and a second aspherical surface for correcting aberrations of the second light beam caused by non-matching.
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