Optical pickup
US7358470B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 10, 2006 |
| Grant date | Apr 15, 2008 |
| Priority date | — |
| Expiry date | Apr 11, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1362
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup with a reflective coating device is provided, including a laser diode (LD), an optical element, and a photo detector integrated circuit (PDIC). The LD emits 1-3 lights with different wavelengths but the same polarization orientation. The beam transmits through the optical element set and focus on a recording media for data reading and writing. The beams are reflected by the recording media, through the optical element set, and detected by the PDIC for signal detection. The optical element set further includes a grating, a reflective coating device, and an objective lens. By using the reflective coating device to change the linear polarization orientation of the emitting light and the feedback light for 90° angle, the relative intensity noise caused by the feedback light in LD can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.