Record players
US4046385A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 10, 1975 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Dec 10, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B3/08
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A record player comprises a motor-driven turntable having an associated general pick-up arm assembly and a control mechanism which includes a main cam serving not only for controlling movement of the pickup arm both during automatic operation of the player and during manual cueing. During a final part of its revolution, the main cam is detached from its positive drive and driven by preloaded spring means, its rotation being damped as by means of a liquid damping arrangement embodying part of the cam or by a frictional damping system in order to provide slow lowering of the pickup arm on to a record surface without the necessity for introducing a separate damping device between the cam and the pick-up arm as has heretofore been the practice.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.