Wound-tape radius detection system for a tape recorder
AssigneeNippon Electric Industries, Co., Ltd.
InventorShigeyuki Kondo
Life of this patent
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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.
Claims6
A wound-tape radius detection system for a tape apparatus, said apparatus of the type comprising a supply reel having a tape wound thereon, a take-up reel arranged to wind up said tape as passed thereto from said supply reel, a transducer provided on a tape transport path between said supply and take-up reels, and transporting means for transporting said tape, said detection system comprising:
- means coupled with one of said supply and take-up reels for producing a first detection signal representing the speed of the rotation of said one reel;
- freely rotatable roller means for rotating in response to transport of said tape;
- means coupled with said freely rotatable roller means for producing a second detection signal representing the speed of transport of said tape;
- and
- detecting means responsive to said first and second detection signals for detecting the radius of the tape wound on said one reel.
Dependencies are inferred from the claim text.