Tape tension and braking control device and method
AssigneeSamsung Electronics Co., Ltd.
InventorChun-Sung Lee
Life of this patent
Estimating the term…
Abstract
A method and apparatus controls reel motors to maintain an even tape tension of a tape between a supply reel and a take-up reel when a tape running mode is changed to a stop mode. One method includes the steps of: determining a supply reel period of the supply reel and a take-up reel period of the take-up reel; braking the supply reel a first delay interval after braking the take-up reel when the take-up reel period is longer than the supply reel period; braking the take-up reel a second delay interval after braking the supply reel when the supply reel period is longer than the take-up reel period; and braking the supply reel and the take-up reel simultaneously when the supply reel period equals the take-up reel period.
Claims15
A method for keeping an appropriate tape tension according to amounts of a tape wound on a supply reel and a take-up reel when a fast play mode is changed to a stop mode in a tape recording and/or reproducing apparatus having a microcomputer for controlling system operation, and direction of supply and take-up reel motors according to a reel on/off control signal and a reel direction control signal, a first speed sensor for providing a supply frequency generator signal to the microcomputer and a second speed sensor for providing a take-up frequency generator signal to the microcomputer by determining the revolution speed of the reel motors, and first and second brake controlling parts for stopping said reel motors when brake control signals are generated from the microcomputer, said method comprising the steps of:
- determining a supply reel period of said supply reel and a take-up reel period of said take-up reel;
- braking the supply reel a first delay interval after braking the take-up reel when the take-up reel period is longer than the supply reel period;
- braking the take-up reel a second delay interval after braking the supply reel when the supply reel period is longer than the take-up reel period;
- and
- braking the supply reel and the take-up reel simultaneously when the supply reel period is equal to the take-up reel period.
A tape tension control circuit, comprising:
- means providing first and second frequency signals respectively representative of speeds of revolution of rotating supply and take-up reels;
- control means for determining a first period corresponding to the supply reel in dependence upon said first frequency signal, for determining a second period corresponding to the take-up reel in dependence upon said second frequency signal, for generating first and second brake control signals, and for adjusting a difference between a time of said generation of the first brake control signal and a time of said generation of the second brake control signal, in dependence upon said first and second periods;
- and
- means for stopping rotation of the supply and take-up reels in response to corresponding ones of said first and second brake control signals.
A tape tension control circuit, comprising:
- means for providing first and second output signals respectively indicative of moments of inertia of rotating supply and take-up reels;
- means for driving the supply and take-up reels;
- control means for determining a first brake control signal in dependence upon said first output signal, for determining a second brake control signal in dependence upon said second output signal, for stopping rotation of the supply and take-up reels, for controlling braking, in dependence upon said first and second brake control signals, of the supply reel a first delay interval after braking of the take-up reel when a take-up reel stopping period is longer than a supply reel stopping period, for controlling braking, in dependence upon said first and second brake control signals, of the take-up reel a second delay interval after braking the supply reel when the supply reel stopping period is longer than the take-up reel stopping period, and for controlling braking, in dependence upon said first and second brake control signals, of the supply reel and the take-up reel simultaneously when the supply reel stopping period is equal to the take-up reel stopping period.
A brake control method for braking rotating reels of a tape recording/reproducing apparatus, comprising the steps of:
- determining a supply reel period of a supply reel and a take-up reel period of a take-up reel;
- providing a supply reel brake control signal to stop the supply reel from rotating and, after a first delay interval, providing a take-up reel brake control signal to stop the take-up reel from rotating when the supply reel period is greater than the take-up reel period;
- providing the take-up reel brake control signal to stop the take-up reel from rotating and, after a second delay interval, providing the supply reel brake control signal to stop the supply reel from rotating when the take-up reel period is greater than the supply reel period;
- and
- simultaneously providing the supply reel and the take-up reel brake control signals to simultaneously stop the supply and take-up reels from rotating when the supply reel period equals the take-up reel period.
A brake control method for braking rotating reels of a tape recording/reproducing apparatus, comprising the steps of:
- determining a supply reel moment of inertia and a take-up reel moment of inertia respectively, for a supply reel and a take-up reel of the apparatus;
- providing a supply reel brake control signal to stop a supply reel from rotating and after a first delay interval, providing a take-up reel brake control signal to stop a take-up reel from rotating when the supply reel moment of inertia is greater than the take-up reel moment of inertia;
- providing the take-up reel brake control signal to stop the take-up reel from rotating and, after a second delay interval, providing the supply reel brake control signal to stop the supply reel from rotating when the take-up reel moment of inertia is greater than the supply reel moment of inertia;
- and
- simultaneously providing the supply reel and the take-up reel brake control signals to simultaneously stop the supply and take-up reels from rotating when the supply reel moment of inertia equals the take-up reel moment of inertia.
A brake control method for braking rotating reels of a tape recording/reproducing apparatus, comprising the steps of:
- determining an amount of tape on a supply reel and an amount of tape on a take-up reel;
- providing a supply reel brake control signal to stop a supply reel from rotating and, after a first delay interval, providing a take-up reel brake control signal to stop a take-up reel from rotating when the amount of tape on the supply reel is greater than the amount of tape on the take-up reel;
- providing the take-up reel brake control signal to stop the take-up reel from rotating and, after a second delay interval, providing the supply reel brake control signal to stop the supply reel from rotating when the amount of tape on the take-up reel is greater than the amount of tape on the supply reel;
- and
- simultaneously providing the supply reel and the take-up reel brake control signals to simultaneously stop the supply and take-up reels from rotating when the amount of tape on the supply reel equals the amount of tape on the take-up reel.
Dependencies are inferred from the claim text.