Optical pickup device
US6614720B1 · kind B1 · utility
7Cited by
11References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 27, 2000 |
| Grant date | Sep 2, 2003 |
| Priority date | — |
| Expiry date | Apr 27, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1398
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Beam shaping means may have a shaping ratio set to allow a light beam emitted from a semiconductor laser and having an elliptic intensity distribution to have an ellipticity of no more than two to obtain a spot achieving high light availability and reduced in size. Furthermore, the shaping ratio can be set to no more than 2.5 to allow a polalized-beam splitter (light separation means) and other components to be arranged in a converged flux passing between the semiconductor laser and a collimator lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.