| 摘要 |
PROBLEM TO BE SOLVED: To lighten weight and to improve sensitivity of an optical pickup by separating from a lens moving part a dichroic filter required for detecting a relative position between an information track and a light spot on different recording media and obtaining a prescribed focusing spot by making a laser beam source having different wavelengths pass through a single lens. SOLUTION: The dichroic filter is folded down and functionally integrated to a mirror. Thus, durability, reliability and operability are improved while maintaining an optical function. |
