Integrated confocal optical pick-up head with a hologram and a polarizer mounted on each side of a transparent heat sink
US5703861A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 26, 1996 |
| Grant date | Dec 30, 1997 |
| Priority date | — |
| Expiry date | Feb 26, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0901
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Light is emitted from a light-emitting element toward an irradiated medium, and returning light reflected by the irradiated medium is diffracted by a hologram device. A polarizer polarizes the light diffracted by the hologram device to produce first polarized light that has passed through the polarizer and second polarized light that has been reflected by the polarizer. The first polarized light is detected by a first light-detecting element, and the second polarized light is detected by a second light-detecting element. A magnetooptical signal is generated as the difference between the intensities of the first and second polarized lights which are detected respectively by the first and second light-detecting elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.