| 摘要 |
<p>An optical head having a beam splitting means (3) disposed in the light path from a collimating lens (2) to a beam-shaping means (4), whereby the light beam from a semiconductor laser beam source (1) retains its elliptical cross-section while it passes through the beam splitting means (3), an its cross-section is not made circular until it arrives at the beam-shaping means (4), so that the size of the beam splitting means (3), a converging lens (2) and other optical members can be reduced, which makes the optical head compact and lightweight.</p> |
