Optical head
US5097456A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 16, 1990 |
| Grant date | Mar 17, 1992 |
| Priority date | — |
| Expiry date | Apr 16, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/09
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical head for use in an optical disk device holds individually an objective lens, an optical path converting prism and first and second relay lenses that are movably only in the direction of tracking. The objective lens and other members can be moved for the purpose of correcting any possible displacement of a track position of a light beam due to any eccentric arrangement involved and of a focusing position of the light beam due to a change in a relative distance between the lenses and due to surface deflection of a disk. The optical head thus allows easy assembly and adjustment thereof with simplified structure, higher resonance frequency, and high speed response.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.