| 摘要 |
A laser light source emits a laser light of an elliptical shape in its polarization plane in parallel to the information recording surface of an optical disc. The laser light is incident into a raising unit, which is placed in a manner that the plane including the optical axis of the incident light and the optical axis of the reflected light forms about 45 degrees with respect to the tangential line direction of the optical disc, in a manner that the direction of the major axis of the elliptical-shaped polarization plane of the laser light is in parallel to the information recording surface of the optical disc. Then, the laser light reflected by the raising unit is focused and irradiated on the information recording surface of an optical disc as a spot light.
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