| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical pickup device for vibration detection reducing cost and miniaturizable by simplifying an optical system. SOLUTION: The optical pickup device for vibration detection includes a diaphragm for receiving vibration having a reflection surface for reflecting light on the one surface, an objective lens for focusing the light from a light source to the reflection surface of the diaphragm, and a photodetector for receiving the reflection from the reflecting surface of the diaphragm, wherein a wavelength plate is provided between the objective lens and the diaphragm. COPYRIGHT: (C)2011,JPO&INPIT
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