Phonograph record detecting arrangement
US3966330A · kind A · utility
35Cited by
2References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 27, 1974 |
| Grant date | Jun 29, 1976 |
| Priority date | — |
| Expiry date | Nov 27, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B33/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The presence and size of a recorded disc on a turntable is detected and indicated by the interruption of a beam or beams of energy which passes in the plane of the disc, through a hole or holes in a turntable, or beneath the turntable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.