Multiple speed stroboscope device
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United States of America Patent
Stats
-
Sep 30, 1980
Grant Date -
N/A
app pub date -
Oct 24, 1978
filing date -
Oct 29, 1977
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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