Optical track scanner
US4507765A · kind A · utility
Inventors
Key dates
| Filing date | Apr 19, 1982 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Apr 19, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0935
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an optical disc player or other apparatus in which a light beam is directed against a record medium surface for optically reading video or audio information recorded in a track on such surface; an optical scanning assembly is provided with an objective lens interposed in the path of the light beam with its optical axis coinciding substantially with such path therethrough, a lens holder including a first tubular member having the objective lens mounted therein and a second tubular member supporting the first member for rectilinear sliding movement relative thereto in a first direction parallel to the optical axis, a base member supporting the second tubular member of the lens holder for rectilinear sliding movement relative thereto in a second direction at right angles to the first direction, for example, in a direction across or along the track in which information is recorded, first and second coils mounted on the lens holder and being independently energizable, and permanent magnets for producing magnetic flux in linking relation to the first and second coils which are oriented so that energizing of one of the coils is controllable for effecting movements of the objective lens…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.