Intergrated optical head with flexible substrate portion
US4937808A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1988 |
| Grant date | Jun 26, 1990 |
| Priority date | — |
| Expiry date | Feb 2, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/1245
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical head including a substrate, an optical waveguide formed on the substrate, a light source formed on a portion of the substrate, a collimator lens for converting light from the light source into parallel light rays, an objective lens for focusing light from the collimator lens onto a recording medium and for converting reflected light from the recording medium into parallel light rays, a beam splitter for dividing light from the objective lens into two parts to send out one of the parts in a predetermined direction, a coupling lens for focusing light from the beam splitter on a position, and a photodetector for detecting light from the coupling lens, is disclosed, in which the collimator lens, the objective lens, the beam splitter, the coupling lens and the photodetector are integrated on the substrate, and the collimator lens or an objective lens supporting part is made flexible to vary the position of the focus of the collimator lens or objective lens by piezo-electric elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.