| 摘要 |
<p>There is disclosed an optical pickup device having semiconductor laser light sources (10,12,14) for first, second, and third wavelengths different from each other. After optical paths of laser beams outgoing from the first and second semiconductor laser light sources are synthesized by a first prism (22), an optical path of a laser beam outgoing from the third semiconductor laser light source is synthesized, through a magnification change lens (26), to raise light efficiency. At this time, each of the laser beams is synthesized by a second prism (24).</p> |
