Tone arm assembly
US4184688A · kind A · utility
10Cited by
3References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 10, 1978 |
| Grant date | Jan 22, 1980 |
| Priority date | — |
| Expiry date | Jul 10, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B3/0857
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tone arm assembly for record players has first and second electro-magnetic motors operable for swinging a tone arm in vertical and horizontal directions, respectively, in respect to a record disc on a turntable, and a control circuit for controlling the first and second motors in such a manner that the tone arm is moved from a raised inoperative position to a lowered playing position, or from the lowered playing position to the raised inoperative position in response to control signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.