Wound-tape radius detection system for a tape recorder
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United States of America Patent
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-
Apr 26, 1983
Grant Date -
N/A
app pub date -
Nov 28, 1980
filing date -
Nov 27, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A wound-tape radius detecting system for use in reel to reel audio and video tape decks includes first and second photoelectric devices which act as supply or take-up reel and tape transport tachometers, resepctively. The ratio of the pulses outputs of the two photoelectric devices are indicative of the amount, or radius, of tape on the supply or take-up reel, which information can be used to control the braking torque applied to the reels when the tape deck is stopped, or the reel motor torque at the start of transport.
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