| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical recording/reproducing device for obtaining a signal with sufficient strength even in the case of a large NA with a simple configuration. SOLUTION: An optical recording/reproducing device is provided with a light source LD, an objective optical system OL1 for condensing luminous flux from the light source, a solid penetration lens L that is arranged near a condensing position, an optical disk member OD that is arranged near the solid penetration lens, and a detection part for detecting diffractive light from the optical disk member. In the optical recording/reproducing device, the optical disk member is provided with a dielectric protection layer at the recording surface side of the optical disk member. |
