Semiconductor laser apparatus and optical pickup apparatus using the same
US5727009A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 3, 1997 |
| Grant date | Mar 10, 1998 |
| Priority date | — |
| Expiry date | Mar 3, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/02325
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an optical pickup apparatus, a laser beam emitted from a semiconductor laser device is reflected upward by a reflecting member, transmitted through a transmission type diffraction grating and split into at least three beams, and which beams are transmitted through a transmission type holographic optical element and condensed onto an optical recording medium by a condenser portion. A return beam reflected by the optical recording medium passes through the condenser portion and diffracted not to impinge upon the transmission type diffraction grating by the holographic optical element and directed to a photodetector portion of a light receiving device. The semiconductor laser device and the light receiving device are disposed in a mount member. The transmission type holographic optical element is supported by a supporting member three-dimensionally movably with respect to the mount member, and the supporting member or/and the holographic optical element is/are fixed with adhesive material with the transmission type holographic optical element being positioned with respect to the mount member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.