Phonograph record eccentricity tester
US4164075A · kind A · utility
3Cited by
5References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 15, 1975 |
| Grant date | Aug 14, 1979 |
| Priority date | — |
| Expiry date | Sep 15, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B3/687
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A phonograph record groove eccentricity tester senses the eccentricity of the circular groove at the inner side of the spiral groove, by means of a groove engaging stylus on a pivoted arm operating a sensor that produces an output signal a peak value of which is displayed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.