JPH04177650A - Reel motor control circuit of rotary head type magnetic recording-reproducing apparatus - Google Patents

Abstract

PURPOSE:To shorten a time required for a tape to reach a desired speed, by making a voltage rise by an arbitrary function from a rotation start voltage of a reel motor when the reel motor is driven. CONSTITUTION:A magnetic tape 1 is rewound, and the voltage to a takeup-reel motor 2a is increased from zero according to an arbitrary function. By reel sensors 2b and 3b fitted to a take-up reel 2 and a supply reel 3 respectively, a voltage Vr impressed on the motor 2a or 3a is stored and held at the time point when a rotation pulse is inputted, that is, when either of the reels rotates. On the occasion when the motor 2a or 3a is driven thereafter, the voltage is increased from the voltage Vr by an arbitrary function by a motor servo circuit 4 and thereby the motor is started.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a rotary head type magnetic recording/reproducing device, and particularly to a reel motor control circuit thereof.

(b) Conventional technology Regarding a conventional reel motor control method for a rotary gutter type digital audio tape recorder, for example, Japanese Patent Application Laid-Open No. 2-179286 (HO2P 5/00)
As described in , in order to quickly reach the target tape speed during high-speed search, input an appropriate constant into the integral term of the integral means of the motor control circuit when starting the reel motor to improve the tape speed rise. A method has been proposed.

In addition, the tape starting method using the reel motor control of the rotary head type digital audio tape recorder that has been conventionally used starts running the tape by increasing the voltage of the take-up reel motor from zero by an arbitrary function. That's what I do.

(c) Problems to be Solved by the Invention However, since the loss torque at the start of tape running differs depending on the magnetic tape, in order to quickly reach the target tape running speed of the magnetic tape, the reel motor is started with consideration given to the loss torque. It was very difficult to set the value of the voltage that should be applied to the reel motor.

(d) Means for Solving the Problems The present invention is intended to solve the above problems, and provides a supply reel and a supply reel motor, a take-up reel and a take-up reel motor, and a supply reel and a take-up reel motor. In a rotary head magnetic recording and reproducing device equipped with a control circuit that controls the voltage of a take-up reel motor, a voltage rising from zero voltage is applied to the take-up reel motor from a state where no magnetic tape is wound on the take-up reel. When the magnetic tee 7 starts traveling by driving the take-up reel with a voltage Vr stored in advance that generates a torque corresponding to the loss torque, the stored voltage ~'r is applied to the take-up reel motor. Furthermore, we propose a reel motor control circuit for a rotary rotor-type magnetic recording and reproducing device, which is characterized by increasing the voltage applied to the take-up reel motor to a predetermined voltage to 7S using an arbitrary function.

(E) Effect With the above configuration, when driving the reel motor during high-speed search, the voltage is increased by an arbitrary function from the stored voltage Vr, thereby starting the tape in a short time and driving the reel motor at high speed. It can be run.

(F) Embodiment A reel motor control circuit according to the present invention will be explained with reference to FIG. (K) is for two recording/playback/do (H1)
(H2). First, the magnetic tape (1) is completely wound from the take-up reel (2) toward the supply reel (3), and the voltage of the take-up reel motor (2a) is increased from zero by an arbitrary function. When a rotation pulse is input to the reel sensors (2b) (3b) attached to each of the take-up reel (2) and the supply reel (3), that is, which of the two reels (2) and (3) starts rotating. The take-up reel motor (2
Store and hold the voltage Vr applied to a). This voltage V
r is the impression MJt pressure of the take-up reel motor (2a) that generates torque corresponding to the loss torque of the reel section. Second
The figure shows the relationship between the voltage applied to the take-up reel motor (2a) and time.The take-up reel motor (2a) is started by increasing the voltage from zero time using an arbitrary function. let TI has two reels (
2) When either of (3) starts rotating, the voltage value to be memorized is Vr, and after this, the take-up reel motor (2a) or the supply reel motor (3a) is turned on again.
When driving the motor, the motor servo circuit (4) starts the motor by increasing the voltage from the voltage Vr by an arbitrary function. Note that the operation for storing the voltage is performed and stored by the control circuit (5) that controls the motor servo circuit (4). As a result, for example, when performing a high-speed search again, the take-up reel motor (2a) is set to a predetermined voltage V.
When it is necessary to raise the voltage to a voltage of s, the voltage of the memory is increased from the voltage Vr to reach a predetermined voltage Vs, so that the voltage is reached in a time To, and the time can be shortened by the time TW.

Note that T2 is the time when the voltage reaches Vs by increasing the voltage from zero voltage by an arbitrary function from the point of time zero.

(G) Effects of the Invention According to the present invention, when driving the take-up reel motor or the supply reel motor, the applied voltage Vr of the reel motor that generates torque corresponding to the loss torque of the reel section is increased by an arbitrary function. This makes it possible to shorten the time it takes to start tape running and reach the desired tape speed. In particular, the search time during high-speed searches is shortened, so the reel motor of a rotary head type magnetic recording/reproducing device can be It is extremely useful for use in control circuits.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a reel motor control circuit of the present invention. FIG. 2 is a diagram showing the relationship between voltage applied to the reel motor and time.

Claims (1)

[Claims] (1) In a rotary head magnetic recording and reproducing device comprising a supply reel and a supply reel motor, a take-up reel and a take-up reel motor, and a control circuit that controls the voltage of the supply reel motor and the take-up reel motor, When no magnetic tape is wound on the take-up reel, a voltage rising from zero is applied to the take-up reel motor to generate torque corresponding to the loss torque.The voltage Vr is stored in advance, and the take-up reel is When driven to start running the magnetic tape, the storage voltage Vr is applied to the take-up reel motor, and the voltage applied to the take-up reel motor is further increased to a predetermined voltage Vs by an arbitrary function. A reel motor control circuit for a rotating head type magnetic recording and reproducing device.