Optical pickup using a waveguide
US4861128A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 3, 1988 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Feb 3, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1384
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical pickup comprising a semiconductor laser, a first waveguide for leading light emitted by the semiconductor laser to recording medium and coupling again light returning from the recording medium; splitting element for separating the light returning from the recording medium from the first waveguide path; and a second waveguide propagating light returning from the recording medium and separated by the splitting element; wherein light going towards the recording medium and light returning from the recording medium propagate separately in the first and the second waveguide so that the utilization efficiency of the light is increased.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.