Optical playback head
US5065390A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1989 |
| Grant date | Nov 12, 1991 |
| Priority date | — |
| Expiry date | Apr 20, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/1058
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magneto-optical playback head which comprises a first optical waveguide facing to a light source at one end thereof and facing to a magneto-optical recording medium at other end thereof for guiding an incident light beam to the magneto-optical recording medium, a second optical waveguide for guiding a light beam reflected from the magneto-optical recording medium to a photodetector provided at one end thereof, a polarizer provided for the first optical waveguide, and an analyzer provided for the second optical waveguide, the polarizer and the analyzer being formed by providing first and second conductive layers on the first and second optical waveguides, with first and second insulating buffer layers interposed therebetween, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.