Multiple speed stroboscope device

Details Multiple speed stroboscope device Multiple speed stroboscope device

1978-10-24

1980-09-30

Evans, F. L.

Optics: measuring and testing

Motion stopping

315241S, G01P 340

Patent

active

042252270

ABSTRACT:
A stroboscope device for a record player for monitoring at least two speeds such as 331/3 and 45 r.p.m. A turntable rim may be provided with a single stroboscope pattern for the relevant speeds. As they pass a light pulse generator, the marks of the stroboscope pattern are optically comparable with light pulse trains produced by a light pulse generator at one of a plurality of frequencies obtained from a given or a-c mains frequency.

REFERENCES:
patent: 1641136 (1927-08-01), Dorn
patent: 1933305 (1933-10-01), Belt
patent: 2418651 (1947-04-01), Mausshardt

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