Tape tension control for a tape recorder
AssigneeU.S. Philips Corporation
InventorMartin Sonnek
Life of this patent
Estimating the term…
Abstract
A device for controlling tension in an elongated article arranged along a path, and a tape recording and/or reproducing apparatus including such a device, in which a control circuit influences the tension in the article, such as a tape, responsive to an electrical signal which is related to a moveable tension sensor. The electrical signal is varied by moving a metal part arranged as a damping element for a single coil only, so as to vary the quality factor (Q) of the coil.
Claims13
A device for controlling tension in an elongated article arranged along a path, comprising:
- a source of biasing force,
- a tension sensor responsive to tension in the article, moveable against the biasing force,
- means for generating an electrical signal corresponding to the position of said sensor, and
- a control circuit and tension control responsive to said electrical signal for influencing the tension in the article,
- characterized in that said means for generating an electrical signal comprise a metal part and a single coil only, the metal part comprising a damping element for the coil so as to vary the quality factor of the coil by movement of the metal part responsive to movement of the sensor.
A recording and/or reproducing apparatus for a record carrier in the form of a tape, comprising:
- a source of biasing force,
- a tape-tension sensor having a tape guide moveable against said biasing force along which the record carrier tape is passed, the sensor further comprising at least one coil and a metal part which cooperates with said coil,
- an oscillator for energizing said at least one coil so as to produce a signal voltage, the amplitude of the signal voltage being a measure of the tape tension, and
- a tape-tension control including a control circuit, for influencing the tape tension, said signal voltage being applied to said control circuit,
- characterized in that said sensor comprises a single coil only, and that the metal part comprises a damping element for the coil which varies the quality factor of the coil by movement of the metal part responsive to movement of the tape guide.
Dependencies are inferred from the claim text.