Tone arm assembly
US4241926A · kind A · utility
1Cited by
2References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 8, 1979 |
| Grant date | Dec 30, 1980 |
| Priority date | — |
| Expiry date | May 8, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B3/0857
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Apparatus for controlling a tone arm is provided with a horizontal drive motor for moving the tone arm in the horizontal direction, a horizontal velocity detector connected to the same rotating shaft as the tone arm so as to move concurrently with both the tone arm and the horizontal drive motor, a control circuit having a motional feedback loop to energize the horizontal drive motor in accordance with a desired pre-set velocity signal and a fedback detected velocity signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.