| 摘要 |
An optical pickup device includes a light module (21) for emitting light and receiving light reflected from a recording medium (19), and a solid immersion lens (SIL) (30) member disposed in an optical path between the light module (21) and the recording medium (19), and having a planar surface (31) facing the recording medium (19) and a plurality of elliptically curved surfaces (33) having different radii of curvature so as to be symmetrical with respect to a central axis (c) on its incident surface to which the light is incident from the light module (21), for focusing the incident light to form a beam spot on a recording plane of the recording medium (19). <IMAGE> |
