Optical head using evanescent light and optical data recording/reproducing apparatus and method of using the same
US5734632A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 1995 |
| Grant date | Mar 31, 1998 |
| Priority date | — |
| Expiry date | Jun 7, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1353
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical information recording/reproducing method for recording and reproducing information using an evanescent light beam includes the steps of installing an optical head near an optical information recording medium, the optical head having a semiconductor laser, a photodetector for detecting a laser beam emitted from a first end surface of the semiconductor laser, and a device for generating evanescent light from the laser beam emitted from a second end surface of the semiconductor laser; injecting a current into the laser to produce a laser beam; generating an evanescent light by the laser beam in the evanescent light generating device; and interacting the evanescent light with the recording medium to record information on or reproduce information from the recording medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.