Optical pickup device and optical recording medium driving apparatus comprising the same
US6023448A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1997 |
| Grant date | Feb 8, 2000 |
| Priority date | — |
| Expiry date | Dec 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/22
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup device has a case constructed by joining a lower frame member and an upper frame member. A semiconductor laser device, a three-beam generating diffraction grating, a transmission type holographic optical element, and a reflecting mirror are arranged in the lower frame member. A lead frame is arranged in the lower frame member. The semiconductor laser device is arranged on the lead frame through a heat sink, to emit laser light in a horizontal direction. A photodiode and the lead frame are arranged in the upper frame member. The photodiode has a light receiving surface parallel to the direction of light emission from the semiconductor laser device, and is mounted on the lead frame. The laser light emitted from the semiconductor laser device passes through the three-beam generating diffraction grating and the transmission type holographic optical element, and is then bent upward and introduced into an optical recording medium. Returned light reflected from a recording surface of the optical recording medium is changed in a direction parallel to the direction of light emission from the semiconductor laser device, passes through the transmission type holographic optic…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.