Device for optically scanning a rotating disc
US4882723A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 15, 1988 |
| Grant date | Nov 21, 1989 |
| Priority date | — |
| Expiry date | Jun 15, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/0932
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to a device for directing a radiation beam towards a recording surface of a rotating disc for recording and/or scanning a recording track without mechanical contact. The device comprises a frame (101), an objective holder (103) having an objective (19) with an optical axis (17), two elongate leaf springs (113, 115) which are arranged one above the other for movably supporting the objective holder relative to the frame, and an electromagnetic actuator (121A; 121B1, 121B2) for the controlled movement of the objective. One (113) of the leaf springs is elastically extensible in its longitudinal direction (113B) to allow pivotal movements of the objective about a pivotal axis 125 which extends transversely of a plane containing the optical axis and intersecting the leaf springs. (FIG. 5)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.