Magnetic recording or reproducing apparatus
AssigneeCanon Kabushiki Kaisha
InventorToshiya Yatomi
Life of this patent
Estimating the term…
Abstract
A magnetic recording or reproducing apparatus for recording or reproducing a signal on or from a magnetic tape while causing the magnetic tape to travel in the state of being wrapped around a rotary head drum provided with a magnetic head. The apparatus includes a speed detecting part for detecting a speed of the magnetic tape, a supply-reel-side tension detecting part for detecting a tension of the magnetic tape between the rotary head drum and a supply reel, a take-up-reel-side tension detecting part for detecting a tension of the magnetic tape between the rotary head drum and a take-up reel, and a control signal switching part for switching control signals in accordance with whether the magnetic tape is made to travel in a forward or rearward direction.
Claims24
A magnetic recording or reproducing apparatus for recording a reproducing a signal on or from a magnetic tape while causing the magnetic tape to travel in the state of being wrapped around a rotary head drum provided with a magnetic head, comprising:
- (a) speed detecting means for detecting a speed of the magnetic tape;
- (b) supply-reel-side tension detecting means for detecting a tension of the magnetic tape between the rotary head drum and a supply reel which is operative as a magnetic-tape sending side;
- (c) take-up-reel-side tension detecting means for detecting a tension of the magnetic tape between the rotary head drum and a take-up reel;
- (d) first driving means for driving the supply reel;
- (e) second driving means for driving the take-up reel;
- (f) control signal switching means for switching control signal for control of said first and second driving means in accordance with whether the magnetic tape is made to travel in a forward or rearward direction;
- (g) a first comparing means for comparing a detection result provided by said speed detecting means with a predetermined reference value;
- (h) first transmitting means for transmitting a result provided by said first comparing means to said control signal switching means as a first control signal;
- (i) adding means for adding a detection result provided by said supply-reel-side tension detecting means to a detection result provided by said take-up-reel-side tension detecting means to provide a tape tension as a sum;
- (j) second comparing means for comparing the tape tension provided by said adding means with a predetermined reference value;
- and
- (k) second transmitting means for transmitting a result provides by said second comparing means to said control signal switching means as a second control signal.
A magnetic recording or reproducing apparatus for recording or reproducing a signal on or from a magnetic tape while causing the magnetic tape to travel in the state of being wrapped around a rotary head drum provided with a magnetic head, comprising:
- (a) supply-reel-side tension detecting mean for detecting a tension of the magnetic tape between the rotary head drum and a supply reel which is operative as a magnetic-tape sending side;
- (b) take-up-reel-side tension detecting means for detecting a tension of the magnetic tape between the rotary head drum and a take-up reel;
- (c) two driving means for driving the supply reel and reel, respectively;
- (d) control signal switching means for switching signals for control of said two driving means in accordance with whether the magnetic tape is made to travel in a forward or rearward direction;
- (e) adding means for adding a detection result provided by said supply-reel-side tension detecting means to a detection result provided by said take-up-reel-side tension detecting means to provide a tape tension as a sum;
- (f) comparing means for comparing the tape tension provided by said adding means with a predetermined reference value;
- and
- (g) transmitting means for transmitting a result provided by said comparing means to said control signal switching means as a control signal.
A magnetic recording or reproducing apparatus for recording or reproducing a signal on or from a magnetic tape while causing the magnetic tape to travel in the state of being wrapped around a rotary head drum provided with a magnetic head, comprising:
- (a) supply-reel-side tension detecting means for detecting a tension of the magnetic tape between the rotary head drum and a supply reel which is operative as a magnetic-tape sending side;
- (b) take-up-reel-side tension detecting means for detecting a tension of the magnetic tape between the rotary head drum and a take-up reel;
- (c) a plurality of coefficient multiplying means for multiplying predetermined coefficients by respective detection results provided by said supply-reel-side tension detecting means and said take-up-reel-side tension detecting means;
- (d) selecting means for performing selection from said plurality of coefficient multiplying means;
- (e) two driving means for driving the supply reel and the take-up reel, respectively;
- (f) control signal switching means for switching signals for control of said two driving means in accordance with whether the magnetic tape is made to travel in a forward or rearward direction;
- (g) adding means for adding a value indicative of a detected supply-reel-side tension to a value indicative of a detected take-up-reel-side tension which values each have passed through a coefficient multiplying means selected by said selecting means, thereby providing a tape tension as a sum;
- (h) comparing means for comparing the tape tension provided by said adding means with a predetermined reference value;
- and
- (i) transmitting means for transmitting a result provided by said comparing means to said control signal switching means as a control signal.
A magnetic recording or reproducing apparatus for recording or reproducing a signal on or from a tape while maintaining the tape in contact with a head, comprising:
- (a) first tension detecting means for detecting a tension of the tap between the head and a supply reel which is operative as a tape sending side;
- (b) second tension detecting means for detecting a tension of the tape between the head and a take-up reel;
- (c) computing means for adding together detection results provided by said respective first and second tension detecting means;
- and
- (d) controlling means for controlling driving of one of the supply and take-up reels on the basis of a result provided by said computing means.
A method for controlling a magnetic recording or reproducing apparatus for recording or reproducing a signal on or from a magnetic tape while causing the magnetic tape to travel in the state of being wrapped around a rotary head drum provided with a magnetic head, comprising the steps of:
- (a) detecting a tension of the magnetic tape between the rotary head drum and a supply reel which is operative as a tape sending side and a tension of the magnetic tape between the rotary head drum and a take-up reel;
- (b) multiplying predetermined coefficients by respective detected-tension values;
- (c) adding the detected-tension values multiplied by the predetermined coefficients to obtain a sum of the detected-tension values;
- (d) comparing the sum with a predetermined reference value;
- and
- (e) controlling driving of one of the supply and takeup reels on the basis of a comparison result obtained in said step (d).
An apparatus for recording or reproducing a signal on or from a tape transported between a first reel and a second reel, comprising:
- (a) recording or reproducing means for recording or reproducing a signal on or from the tape;
- (b) first detecting means for detecting a tension of the tape between said first reel and said recording or reproducing means and outputting first tension information;
- (c) second detecting means for detecting a tension of the tape between said second reel and said recording or reproducing means and outputting second tension information;
- (d) speed detecting means for detecting a speed of the tape and outputting speed information;
- and
- (e) controlling means for controlling one of said first and second reels on the basis of the speed information and controlling the other on the basis of both said first tension information and said second tension information.
Dependencies are inferred from the claim text.