| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical pickup device capable of preventing fluctuation of an output level in a laser light source caused by second return light. SOLUTION: In the optical pickup device in which at least a laser light source, a half mirror, a λ/4 wavelength plate and a reflection mirror are arranged with prescribed spaces apart, the device is characterized by a double refraction plate arranged between the laser light source and the half mirror. |
