Tone arm assembly
US4214757A · kind A · utility
3Cited by
2References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 8, 1979 |
| Grant date | Jul 29, 1980 |
| Priority date | — |
| Expiry date | May 8, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B3/125
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tone arm assembly provided with a motor for moving a tone arm in a horizontal direction with respect to a record disc, a servo circuit for keeping the moving velocity of the tone arm constant, and a positioning servo circuit to operate when the tone arm reaches a reproducing position, in which the positioning servo circuit and the velocity controlling servo circuit are combined together thereby to stop the tone arm quickly at a predetermined position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.