Optical device for magneto-optical disc system
US5608233A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1995 |
| Grant date | Mar 4, 1997 |
| Priority date | — |
| Expiry date | Apr 27, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0264
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical device for detecting a magneto-optical signal can be simplified and miniaturized in arrangement. An optical device for detecting a magneto-optical signal includes an optical element (101) in which a light-emitting portion (4) and a light-receiving portion (5) are closely disposed on a common substrate and in which reflected-back light obtained from a magneto-optical medium (34) after light emitted from the light-emitting portion (4) was reflected on the magneto-optical medium (34) is detected at a position near confocal position by the light-receiving portion (5). The light-receiving portion (5) on the optical element (1) has a light-receiving surface inclined relative to the optical axis of the reflected-back light formed thereon so that the light-receiving portion has a polarization selective transmittance function on its surface. Thus, the reflected-back light from the magneto-optical medium (34) can be received and detected by the light-receiving portion (5) on the optical element (101).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.