JPH11162048A - Tape like medium running device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tape like medium running device making it easy to use by shortening a time required for a high speed search or rewinding, etc. SOLUTION: By setting switching a target speed for a high speed start with the target speed for a low speed activation based on a wound size of a take-up side reel 2 of a running activation position of a tape like medium, when the wound size is smaller than a wound size comparison reference value, the high speed activation is performed, and a running time of high speed running such as the high speed search or the rewinding, etc., is shortened, and moreover, a load occurring when a motor is started for the tape like medium is suppressed, and a damage is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-speed running tape-like medium mounted on a magnetic recording / reproducing apparatus such as a video tape recorder (hereinafter, referred to as a VTR) using a tape-shaped medium. is there.

[0002]

2. Description of the Related Art In recent years, as disks having an advantageous access speed have been growing as recording / reproducing media, the rotation speed of a motor for a magnetic tape having an disadvantageous access speed is increased so that a high-speed search or winding operation can be performed. There is a need to shorten the running time of high-speed running to improve ease of use.

Conventionally, there has been known a tape-shaped medium traveling device described in Japanese Patent Application Laid-Open No. 2-49256. Hereinafter, a conventional tape-shaped medium traveling device will be described with reference to the drawings. FIG. 3 is a block diagram showing a configuration of a conventional tape-shaped medium traveling device. 1 is a motor for driving the tape, 2 is a take-up reel on which one end of a tape-shaped medium is wound by rotation of the motor 1 being transmitted by a belt or a gear and the tape-shaped medium runs by rotation, 3 is a tape-shaped medium The other end is wound, and the tape-like medium runs by the rotation of the take-up reel 2 to supply the tape-like medium to the take-up reel 2. Rotation detecting means for detecting a magnetized polarity (N-pole and S-pole) and outputting a frequency signal and outputting a signal having a frequency proportional to the rotation speed of the motor 1; A driving unit for rotating the motor 1 based on a rotation command signal output from the traveling speed varying unit 53; a central processing unit 51 for outputting a signal corresponding to the winding diameter based on the number of rotations of the take-up reel 2 and the supply reel 3 , 52 is medium D converting the output of the processing unit 51 from analog to digital /
A converter 53 is a tape traveling speed varying means for varying the driving signal supplied to the driving means 11 according to the output of the D / A converter 52 to vary the traveling speed of the tape medium, and 54 is a rotation detecting means 4 , A control signal to be input to the tape traveling speed varying means 53 is generated based on the rotation frequency detected by the above, and at the start of the high speed search, the rotation speed of the motor 1 is gradually increased, and then the motor 1 is run at the target traveling speed at the time of the high speed search Control means for outputting a control signal as described above. The take-up reel 2 and the supply reel 3 are reversed for fast-forward and rewind.

[0004] The operation of the conventional tape-shaped medium running device configured as described above will be described below with reference to the drawings.
At the start of high-speed running, the central processing unit 51 that outputs a signal corresponding to the winding diameter causes the tape running speed varying means 53 to change the rate at which the rotation speed is gradually increased to the take-up reel 2.
If the winding diameter is small, increase the rate of increase.If the winding diameter is large, reduce the rate of increase so that tape damage does not occur. The vehicle travels at the target traveling speed during traveling. (Note that such a method of starting is hereinafter referred to as a low-speed starting.) This state will be described with reference to FIG. FIG.
3 is a characteristic diagram showing a rise in the rotation speed of the motor 1. FIG. Reference numeral 201 denotes the start of the low-speed start, 202 denotes the start of the low-speed start particularly when the winding diameter is small, Va denotes the reproduction speed, and Vb denotes the maximum rotation speed of the motor 1. The vertical axis represents the rotation speed of the motor 1 and the horizontal axis represents the elapsed time after the motor 1 is started. In particular, as shown by the rise 202 when the winding diameter is small, the rising characteristics still have a slope even if the winding diameter is small.

[0005]

However, the above-mentioned conventional configuration has the following problems.

That is, when the winding diameter of the tape-shaped medium is small, the tape speed is small even if the motor 1 is rotated at the maximum rotation speed at which the motor 1 can rotate. However, since the rotation speed is gradually increased, that is, low-speed starting is performed, the time required for high-speed traveling is slow, and the traveling time for high-speed traveling such as high-speed search or winding is long. Had a point.

The present invention solves the above-mentioned conventional problems. As a starting method of the motor 1, the size of the winding diameter of the tape-shaped medium on the winding side is determined, and when the winding diameter is small, high-speed starting is performed. Accordingly, it is an object of the present invention to provide a tape-shaped medium traveling device in which a traveling time of a high-speed traveling such as a high-speed search or a winding operation is shortened to facilitate use.

[0008]

In order to achieve this object, a tape-shaped medium traveling device according to the present invention comprises: a rotation detecting means for outputting a signal having a frequency proportional to the rotation speed of a motor; The winding reel that rotates in synchronization with the rotation of the winding motor, the supply reel around which the other end of the tape-shaped medium is wound, and the winding diameter of the tape-shaped medium wound around the winding reel are detected. Winding diameter detecting means, high-speed starting target calculating means for outputting a target speed for starting the rotation speed of the motor at the first speed, and starting the rotation speed of the motor at the second speed and gradually increasing with time. A low-speed start target calculating means for outputting a target speed for the winding diameter; a winding diameter comparing means for comparing the output of the winding diameter detecting means with a winding diameter comparison reference value set in advance and outputting a comparison result; Fast startup based on the output of the comparison means A target speed setting means for setting the target speed of the motor by switching the output of the target calculation means and the output of the low-speed start target speed calculation means, and a rotation command signal based on the output of the rotation detection means and the output of the target speed setting means. It has a configuration provided with speed control means for outputting and drive means for rotating the motor based on the rotation command signal.

With this configuration, the running time of high-speed running such as high-speed search or winding can be shortened, and the load generated when the motor for the tape-shaped medium is started can be suppressed to prevent damage.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION
Rotation detecting means for outputting a signal having a frequency proportional to the rotation speed of the motor, a winding reel on which one end of the tape-shaped medium is wound and rotated in synchronization with the rotation of the motor, and the other end of the tape-shaped medium being wound on A supply-side reel, a winding-diameter detecting means for detecting a winding diameter of the tape-shaped medium wound on the take-up reel, and a target speed for starting the rotation speed of the motor at the first speed. High-speed start target calculating means, low-speed start target calculating means for starting the motor at the second speed and outputting a target speed for gradually increasing with time, and output of the winding diameter detecting means set in advance internally A winding diameter comparison unit for comparing the obtained winding diameter comparison reference value and outputting a comparison result, and switching between the output of the high-speed start target calculation unit and the output of the low-speed start target speed calculation unit based on the output of the winding diameter comparison unit. Motor target speed Target speed setting means, a speed control means for outputting a rotation command signal based on an output of the rotation detection means and an output of the target speed setting means, and a driving means for rotating a motor based on the rotation command signal. The target speed for high-speed start and the target speed for low-speed start are switched and set based on the winding diameter of the take-up reel at the start position of running the tape-shaped medium, If the winding diameter is smaller than the winding diameter comparison reference value, the output of the high-speed starting target speed calculation means having the maximum rotation speed of the motor as the target speed is selected, and the rotation speed is suddenly changed from the rotation stop state to the maximum rotation speed by the speed control means. By performing high-speed startup, the running time of high-speed running such as high-speed search or winding can be shortened, and the load generated at the time of motor startup on the tape-shaped medium is suppressed and damage is caused. Such an action can be prevented.

According to a second aspect of the present invention, there is provided a rotation detecting means for outputting a signal having a frequency proportional to the rotation speed of the motor, and a winding means for winding one end of the tape-shaped medium and rotating in synchronization with the rotation of the motor. A take-up reel, and drive means for rotating a motor based on a rotation command signal, the winding diameter of the tape-shaped medium wound on the take-up reel is detected, and the winding diameter is larger than a winding diameter comparison reference value. If smaller, set the motor speed to 1st
Set the target speed for high-speed startup to start at the speed of
If the winding diameter is not smaller than the winding diameter comparison reference value, a target speed for a low-speed start is set in which the rotation speed of the motor is started at the second speed and gradually increased with time. It is characterized by performing speed control so as to approach the speed.If the winding diameter is smaller than the winding diameter comparison reference value, select high-speed starting with the maximum rotation speed of the motor as the target speed and stop rotation. By performing a high-speed start that rapidly starts from the state to the maximum rotation speed, the running time of high-speed running such as high-speed search or winding can be shortened, and the load generated at the time of starting the motor on the tape-shaped medium is suppressed. This has the effect that damage can be prevented.

Hereinafter, an embodiment of a tape-shaped medium running device of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a tape-shaped medium traveling device according to Embodiment 1 of the present invention. 1 is a motor for driving the tape, 2 is a take-up reel on which one end of a tape-shaped medium is wound by rotation of the motor 1 being transmitted by a belt or a gear and the tape-shaped medium runs by rotation, 3 is a tape-shaped medium The other end is wound, and the tape-like medium runs by the rotation of the take-up reel 2 to supply the tape-like medium to the take-up reel 2. Rotation detecting means having an MR element for detecting a magnetized polarity (N pole and S pole) and outputting a frequency signal, and outputting a signal having a frequency proportional to the rotation speed of the motor 1; Of the take-up reel 2 at the time of running at a constant speed, for example, when the tape-shaped medium is run at a precise speed, or when special playback such as fast-forward playback / rewind playback is performed.
A winding diameter detecting means 6 for detecting the winding diameter of the tape-like medium wound on the take-up reel 2 from the rotation time, and the motor 1 capable of rotating at a target rotation speed of the motor 1 at a first speed. The high-speed start target calculating means 7 for setting and outputting the maximum rotation speed sets the target rotation speed of the motor 1 to the second rotation speed during normal reproduction as the initial speed and gradually rotates with the elapsed time from the motor startup. A low-speed start target calculating means 8 for setting and outputting the speed so as to increase the speed is compared with the input of the winding diameter comparison reference value and the winding diameter output from the winding diameter detecting means 5 to calculate the high-speed starting target speed calculating means 6. The winding diameter comparing means 9 outputs a control signal for switching between the output and the output of the low speed starting target speed calculating means 7. The winding diameter comparing means 9 outputs an output of the high speed starting target calculating means 6 based on a control signal output from the winding diameter comparing means 8. Slow start target The target speed setting means 10 outputs one of the outputs of the output means 7 as a target speed. The target speed setting means 10 sets the motor 1 to a target speed based on the rotation speed detected by the rotation detecting means 4 and the target speed output by the target speed setting means 9. Speed control means for outputting a rotation command signal for rotating close to
Reference numeral 1 denotes a driving unit that rotates the motor 1 based on a rotation command signal output from the speed control unit 10. The take-up reel 2 and the supply reel 3 are reversed for fast-forward and rewind.

Here, a method of calculating the winding diameter in the winding diameter detecting means 5 will be described. Tape speed V1, take-up reel 1
The rotation time is T1, and the winding diameter is R (indicating the radius from the center of the reel to the outer periphery of the tape medium). The length of the tape-shaped medium wound by one rotation of the reel is obtained by (V1) × (T1) (1). At this time, the outer circumference of the reel is 2πR (2) when using the circular constant π. Since the tape-shaped medium is wound by the rotation of the take-up reel, the lengths of (1) and (2) are equal. Therefore,
From both, the winding diameter R is determined by the following equation: R = (V1) × (T1) / (2π) (3)

Incidentally, in order to detect the rotation of the reel, the rotation of the reel is detected based on the fact that a slit provided on the reel has passed one location where a photo sensor is provided. In the above description, the method of calculating the winding diameter using the time of one rotation of the reel has been described. However, if the reel has A slits, the winding diameter can be obtained from the rotation time of the reel at 1 / A rotation. I can do it. The same effect can be obtained by using an MR element as in the motor 1 (inversely, the same effect can be obtained by providing a slit in the motor 1).

The low-speed start target calculation method in the low-speed start target calculation means 7 is such that the initial speed of the motor is VI, the elapsed time from the motor start is T, the speed pitch per unit time is ΔV, and the target speed of the motor is Assuming that V, V = (VI) + (T) × (△ V) (4)

The operation of the tape-shaped medium traveling device shown in FIG. 1 will be described below. When a command is input to wind the tape-shaped medium into the tape-shaped medium traveling device (the command is not shown), the speed control means 10 starts the motor 1 via the drive means 11. The winding diameter detecting means 5 detects the winding diameter of the tape-like medium wound on the take-up reel 2 at the tape position (if the reproduction or the like is not performed in advance, the reproduction or the like is performed from that position. To calculate the winding diameter). When the winding diameter outputted by the winding diameter detecting means 5 is smaller than the winding diameter comparison reference value, the target speed setting means 9 outputs the output of the high-speed starting target speed calculating means 6 by a control signal output from the winding diameter comparing means 8. The selected speed is output to the speed control means 10 as a target speed. On the other hand, when the winding diameter outputted by the winding diameter detecting means 5 is larger than the winding diameter comparison reference value, the output of the low-speed starting target speed calculating means 7 is selected by the control signal which is the output of the winding diameter comparing means 8, and the motor start-up is started. Is output to the speed control means 10 such that the rotation speed is gradually increased depending on the elapsed time. The speed control means 10 moves the motor 1 close to the target speed from the rotation speed of the motor 1 obtained from the frequency signal from the rotation detection means 4 by the rotation of the motor 1 and the target speed output from the target speed setting means 9. It outputs a rotation command signal for rotating. The driving unit 11 rotates the motor 1 based on the rotation command signal output from the speed control unit 10.
The take-up reel 2 to which the rotation has been transmitted by the rotation of the motor 1 takes up the tape medium from the supply-side reel 3.

Next, the relationship between the rotation speed of the motor 1 and the elapsed time after the start of the motor 1 will be described with reference to FIG. 2
00 indicates the start of high-speed startup. In the conventional tape-shaped medium traveling device, there is an inclination in the rising characteristic as shown by the rising 202 when the winding diameter is small at a low speed start.
On the other hand, in the present invention, when the winding diameter is small, there is almost no inclination as shown by the rising 200 of the high-speed startup, and the winding rises instantaneously. For this reason, the traveling time of high-speed traveling such as high-speed search or winding can be shortened.

It should be noted that, in the first embodiment, FIG.
The portion 100 surrounded by a broken line therein can be similarly realized by software processing in a microcomputer, and this software processing will be described with reference to FIG. FIG. 2 is a flowchart showing software processing of the tape-shaped medium traveling device according to the first embodiment of the present invention. Reference numeral 20 denotes a take-up reel 2 when the tape-shaped medium is run at a constant speed, for example, when the tape-shaped medium is played at a precise speed, or when special playback such as fast-forward playback / rewind playback is performed. Is a winding diameter detecting step for detecting the winding diameter of the tape-shaped medium wound on the take-up reel 2 from the time of one rotation of the reel, 21 is a winding diameter comparison reference value inputting step for inputting a winding diameter comparison reference value, 22 Is a winding diameter comparison step of determining whether the winding diameter is smaller than the winding diameter comparison reference value for the winding diameter comparison reference value input in the winding diameter comparison reference value input step and the winding diameter obtained in the winding diameter detection step 20. , 23
In the winding diameter comparison step, when the winding diameter is determined to be smaller than the winding diameter comparison reference value, the rotation speed of the motor 1 becomes the maximum rotation speed at which the motor 1 that is also the first speed can rotate. High-speed start target setting step for setting target speed, 24
If the winding diameter is not smaller than the winding diameter comparison reference value in the winding diameter comparison step 22, the rotation speed of the motor 1 is set to the second
A low-speed start target setting step for setting a target speed such that the rotation speed during normal reproduction, which is also the speed, is set as the initial speed and gradually increasing the rotation speed with the elapsed time from the motor start, and 25 is detected by the rotation detection means 4. And a speed control step 26 for outputting a rotation command signal for rotating the motor 1 at the target speed from the rotation speed and the target speed.

The operation of the software processing of the tape-shaped medium traveling device shown in FIG. 2 will be described below. In the winding diameter detection step 20, the winding diameter of the tape-like medium wound on the take-up reel 2 at the tape position is detected (if the reproduction or the like has not been performed in advance, the reproduction or the like is performed from that position. To calculate the winding diameter).
In a winding diameter comparison reference value input step 21, a winding diameter comparison reference value is input. When the winding diameter is smaller than the winding diameter comparison reference value, a high-speed start target speed setting step 23 is selected in the winding diameter comparison step 22 so that the rotation speed of the motor 1 is the first speed and the maximum rotation speed at which the motor 1 can rotate. Set the target speed so that On the other hand, if the winding diameter is larger than the winding diameter comparison reference value, a low-speed start target speed setting step 24 is selected in the winding diameter comparison step 22, and the rotation speed of the motor 1 is set to the rotation speed during normal reproduction as the initial speed. The target speed is set so that the rotation speed is gradually increased with the lapse of time. In the rotation speed input step 25, the rotation speed detected by the rotation detecting means 4 is input. Speed control step 2
In step 6, a rotation command signal for rotating the motor 1 at the target speed is output from the rotation speed and the target speed. Next, returning to the winding diameter comparison step 22 again, the target speed at a new time point is set in the high-speed start target speed setting step 23 or the low-speed start target speed setting step 24, and the rotation speed is input in the rotation speed input step 25, Speed control step 2
At step 6, a new rotation command signal is output.

In the above description, the rotation speed of the motor 1 is gradually increased at the time of low-speed startup, but this also includes a case where the rotation speed is increased stepwise.

As described above, according to the present embodiment, the target speed for high-speed start and the target speed for low-speed start are determined based on the winding diameter of the take-up reel at the position where the tape-shaped medium starts running. If the winding diameter is smaller than the winding diameter comparison reference value, a high-speed start is performed by rapidly starting from the rotation stop state to the maximum rotation speed with the maximum rotation speed of the motor 1 as a target speed. Alternatively, the running time of high-speed running such as winding can be shortened, and the load generated at the time of starting the motor on the tape-shaped medium can be suppressed to prevent damage.

[0023]

As described above, according to the present invention, the target speed for high-speed start and the target speed for low-speed start are switched based on the winding diameter of the take-up reel at the running start position of the tape-shaped medium. By setting, when the winding diameter is smaller than the winding diameter comparison reference value, high-speed starting can be performed to shorten the running time of high-speed running such as high-speed search or winding, and
The load generated when the motor is started on the tape-shaped medium can be suppressed to prevent damage, and a tape-shaped medium traveling device that is easy to use can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a tape-shaped medium traveling device according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing software processing of the tape-shaped medium traveling device according to the first embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a conventional tape-shaped medium traveling device.

FIG. 4 is a characteristic diagram showing a rise in rotation speed.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 motor 2 take-up side reel 3 supply side reel 4 rotation detecting means 5 winding diameter detecting means 6 high-speed starting target speed calculating means 7 low-speed starting target speed calculating means 8 winding diameter comparing means 9 target speed setting means 10 speed control means 11 driving Means 20 Reel diameter detection step 21 Reel diameter comparison reference value input step 22 Reel diameter comparison step 23 High-speed start target speed setting step 24 Low-speed start target speed setting step 25 Rotation speed input step 26 Speed control step

Claims (2)

[Claims] A rotation detecting means for outputting a signal having a frequency proportional to a rotation speed of a motor; a take-up reel on which one end of a tape-shaped medium is wound and rotated in synchronization with rotation of the motor; A supply reel on which the other end of the medium is wound, a winding diameter detecting means for detecting a winding diameter of the tape-shaped medium wound on the winding reel, and a rotation speed of the motor at a first speed. A high-speed start target calculating unit that outputs a target speed for starting, a low-speed start target calculating unit that outputs a target speed for starting the rotation speed of the motor at a second speed and gradually increasing with time, A winding diameter comparison unit that compares the output of the winding diameter detection unit with a winding diameter comparison reference value set in advance and outputs a comparison result; and the high speed start target calculation unit based on the output of the winding diameter comparison unit. Output and low-speed start Target speed setting means for switching the output of the target speed calculation means to set the target speed of the motor;
Speed control means for outputting a rotation command signal based on the output of the rotation detection means and the output of the target speed setting means,
And a driving means for rotating the motor based on the rotation command signal. 2. A rotation detecting means for outputting a signal having a frequency proportional to a rotation speed of a motor, a take-up reel around which one end of a tape-shaped medium is wound, and which rotates in synchronization with rotation of the motor; Driving means for rotating the motor based on a signal, the winding diameter of the tape-shaped medium wound on the take-up reel is detected, and the winding diameter is smaller than a winding diameter comparison reference value. The rotation speed of the motor is
Set the target speed for high-speed startup to start at the speed of
If the winding diameter is not smaller than the winding diameter comparison reference value, the rotation speed of the motor is started at a second speed, and a target speed for a low-speed start that gradually increases with time is set. A tape-shaped medium traveling device that performs speed control so that an output approaches the target speed.