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US 5,224,643 AGranted
Tape guide system with temperature compensation for drive signal
AssigneeSony Corporation
InventorsToshiaki Kojima, Kazuyuki Sugizaki
Life of this patent
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Abstract
In a tape guide system having a tape guide device for guiding a magnetic tape in a video tape recorder or the like and which comprises a tape guide and an ultrasonic vibrator fixed to the tape guide for vibrating the tape guide with a standing wave, a drive device supplies a drive signal to the ultrasonic vibrator, and a temperature compensating circuit is provided for effecting temperature compensation of the drive signal supplied from the driver device to the ultrasonic vibrator.
Claims8
An apparatus for recording and/or reproducing signals on a tape, said apparatus comprising:
- tape supply means and tape take-up means with a tape extending therebetween;
- tape drive means for longitudinally transporting said tape between said supply means and take-up means;
- head means engageable with said tape between said supply means and take-up means while the tape is being transported for recording and/or reproducing signals on the tape;
- guiding means for guiding the tape between said supply means and take-up means including at least one guide element with a predetermined resonant frequency and having a surface slidably engageable by the tape for guiding the latter, and ultrasonic oscillation generating means connected with said guide element and being operable for effecting ultrasonic vibration of the guide element so as to reduce frictional resistance to movement of the tape across said surface of the guide element;
- drive circuit means for supplying an ultrasonic sine-wave drive signal to said oscillation generating means for operating the latter;
- control means for determining the frequency of said ultrasonic sine-wave drive signal to correspond to said resonant frequency;
- temperature sensing means for sensing a change in the temperature of said guide element and to which said control means responds;
- and temperature compensating means controlled by said control means for changing the frequency of said ultrasonic sine-wave drive signal so as to correspond with any change in said resonant frequency of said guide element resulting from a sensed temperature change.
5 more elements
Dependencies are inferred from the claim text.