Apparatus for optically reading and/or recording information
US4514837A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 3, 1983 |
| Grant date | Apr 30, 1985 |
| Priority date | — |
| Expiry date | Jan 3, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B7/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An apparatus for optically reading and/or recording information on a rotary optical disc (4), such as a video-disc player or an optical recorder, comprises an objective carrier (3) for an objective (2) which is radially moved to and fro over a frame (1) by a drive unit. Driving is effected by means of two electric motors (7) which rotate in opposite directions and which move the objective carrier (3) to and fro and, simultaneously but in an opposite direction, move two balancing masses (11) in paths on each side of the path of movement of the objective carrier, so that during accelerations and decelerations of the to-and-fro movements of the objective carrier no reactive forces or reaction moments are transmitted to the frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.