JPH03132953A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent a tape from being damaged and to reduce power consumption by plurally setting the rotating speed of a rotating cylinder, selecting and switching the rotating speed according to an operation mode and simultaneously switching it to the lower rotating speed than that at the time of recording and reproducing while the tape is stopped. CONSTITUTION:A rotating speed switching means 1a which switches the rotating speed of the rotating cylinder 10 to two stages of the high and the low rotating speeds by the switching of switches SW1 and SW2 is operated by a console panel 2. Frequency comparators alpha 11 and beta 12 constitute a means 1b which respectively sets the different rotating speed. In such a case, when the rotating speed of the cylinder 10 is switched according to the operation mode and pose, still or the like is inputted by the console panel 2, the rotating speed of the cylinder 10 is switched to the lower rotating speed than that at the time of recording and reproducing specially while the tape is stopped. Thus, the tape is prevented from being damaged caused by the getting off of the lead thereof and power consumption is reduced.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention relates to a magnetic recording/reproducing device, particularly a magnetic recording/reproducing device in which a recording or reproducing head is mounted on a rotating cylinder, and the rotating cylinder is rotated to record or reproduce information. The present invention relates to a recording/reproducing device.

(Prior art) As a typical example of this type of magnetic recording tl> recording device, V
There is a TR (video tape recorder). Recently, in VTRs, the diameter of the rotating cylinder is often reduced in order to downsize the device. In this case, it is necessary to increase the rotation speed of the rotary cylinder in order to maintain compatibility with conventional devices, that is, to comply with the specified tape format.

Furthermore, with the advent of high-definition television and the increase in the amount of +l'1feJ due to the digitalization of VTRs, it is necessary to widen the band of recording signals. In this case, it is effective to increase the relative speed between the magnetic head and the magnetic tape, that is, to increase the number of rotations of the rotating cylinder, and therefore the number of rotations of the rotating cylinder has been increasing.

[Problem to be solved by the invention]

Since the conventional example is configured as described above, as the rotation speed of the rotary cylinder increases, the rise time of the rotary cylinder from a stopped state to reach the specified rotation speed is slow, and in a pause or stale state, the tape In addition to the increased speed of rotation of the rotating cylinder, the wind generated around the rotating cylinder increases, and this wind pressure causes damage to the tape during loading and unloading due to the outside of the tape reel. This not only causes problems such as damage, but also causes a number of problems such as increased power consumption and loud noise.

This invention was made in order to solve the problems of the conventional example as described below.The rotation speed of the rotating cylinder is set to a plurality of different rotation speeds depending on the operating mode, and the rotation speed is set to be suitable for the operating mode of the device. When the rotation speed of the rotating cylinder is changed to the rotation speed of the rotating cylinder and the tape stops, the rotation speed of the rotating cylinder is recorded.
The objective is to provide a magnetic recording/reproducing device that can be set to a lower rotational speed than when it is being used.

(Means for Solving the Problems) The main device for magnetic recording according to the present invention having the configuration as described in (2) below has a recording or reproducing head mounted on a rotating cylinder, and the rotating cylinder is rotated to record information. In a magnetic recording/reproducing device for recording or reproducing data, a rotation speed setting means for setting the rotation speed of the rotary cylinder to a plurality of different rotation speeds, and a rotation speed setting means for setting the rotation speed of the rotary cylinder to a plurality of different rotation speeds according to the operating mode of the device. It is equipped with one rotation speed switching stage that selectively switches the rotation speed of the rotating cylinder +1f, and when the recording medium is stopped, +
'+rt The rotation speed of the rotation cylinder f is set to a lower rotation speed than that during recording and reproduction,
By reducing the relative speed between the recording medium and the head, it is attempted to achieve the objective of Yoshiki.

(Function) Magnetic recording iIG according to the present invention configured as follows.
Depending on the operation mode of this device, the playback device rotates at a specified high speed only when in normal recording/playback mode, and when in other modes, it rotates to that mode from among the different rotation speeds set. In particular, when the tape is stopped, the rotation speed of the one-rotation cylinder is changed to a lower rotation speed than during recording and reproduction.

(Example) An example of the present invention will be described below with reference to the drawings.

(Structure) No. 1181 is a block diagram showing the structure of a servo system of a rotating cylinder in a VTR as an example of the magnetic recording/reproducing apparatus according to the present invention.

In FIG. 1, 1 is a system controller, and 1a is a rotation speed switching means for switching the rotation speed of the rotary cylinder 10 into two stages, high speed and low speed, by switching switches SWI and SW2, and is operated by an operation panel 2. . Frequency comparator α11 and frequency comparator βI2 each have a hole (5
13 is a phase comparator, 14 is a loop filter, 15 is i7.j
1 is a quasi-voltage of J and c which are I standards, 16 is a motor driver, and 17 is a motor that drives the rotating cylinder 10.

(motion) The operation will be explained based on the above configuration.

F G (Freque
The signal generated by the ncyGenerator) is supplied to the frequency comparator α11. The frequency comparator α11 detects a deviation in the rotational speed of the rotary cylinder 10 from a specified rotational speed, and outputs a voltage corresponding to the speed of this deviation. Further, P C (Pha
The signal generated by the phase comparator 13 is supplied to the phase comparator 13. The phase comparator 13 compares this signal with the reference No. 18, and outputs a voltage corresponding to the deviation from the standard No. δ.

Frequency comparator α! 1 and the output of the phase comparison unit 13 are added together and supplied to the motor driver 16 through the loop filter 14, and the rotation of the rotating cylinder lO is determined by a predetermined value (+, i1
Control so that the number of rotations is the same.

Next, operations other than the recording 111 raw mode will be explained.

When a manual action such as pause or stay is performed from the operation panel 2, the rotation speed switching means 1a provided in the system controller 1 switches the contacts of the switch SWI and the switch SW2 from the A side to the B side, respectively. The signal generated by the FG of the rotary cylinder 10 is thereby supplied to the frequency comparator β12. The frequency comparator β12 detects a deviation from a rotational speed set lower than the cylinder rotational speed during normal recording and reproduction (for example, 1/2 of the normal cylinder rotational speed), and outputs a voltage corresponding to the deviation. This output is added to a reference voltage 15, which is a phase reference in place of the output of the phase comparator 13, and is supplied to the motor driver 16 via the loop filter 14 to increase the rotation speed of the rotary cylinder 10 to a level higher than the normal cylinder rotation speed. The rotation speed is controlled to be constant at a low set rotation speed (for example, 1/2 of the normal cylinder rotation speed). Setting the rotational speed of the rotating cylinder 10 lower than the normal rotational speed in this way is not limited to pause and stay states, but also during tape loading.
Also, do this in a stopped state.

As described above, according to this embodiment, the normal recording 11#
In other than raw mode [! The rotation of the 11-turn cylinder 10 can be set low, without increasing the time it takes for the rotation cylinder 10 to start rotating due to stiffness, and to avoid damage to the tape or stoppage of the tape due to pauses or stale conditions. - Problems such as noise that sometimes occur can be corrected.

In the above embodiment, an example was shown in which the number of rotations of the rotary cylinder 10 was set to two values, but it is also possible to set the number of rotations as many as -L different from here on.

In addition, when three or more increasing rotation speeds are set, the rotation speed of the rotating cylinder 10 when the tape is stopped may be appropriately set to a lower rotation speed than the rotation speed of the rotating cylinder 10 during recording 1 [1 recording]. .

Furthermore, it goes without saying that the method of setting the rotational speed of the rotary cylinder 10 to a plurality of rotational speeds and performing switching control is not limited to the embodiment described above, and can be realized by other methods.

〔Effect of the invention〕

As explained above, according to the present invention, recording or
In a magnetic recording and reproducing device that records or reproduces information by mounting a 101 mm head on a rotary cylinder and rotating this cylinder, the number of 101 rotations of the rotary cylinder is set to a plurality of numbers, and The number of revolutions of the rotary cylinder is selected and changed, and the number of revolutions is set lower when the tape is stopped than during recording and reproduction. This not only shortens the time it takes for the rotary cylinder to start rotating, which reduces damage to the tape, but also reduces power consumption and reduces the amount of 1lf/1 loaf. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a servo system for a rotating cylinder in a VTR according to an embodiment of the present invention. 1 is the system controller, la is the rotation speed switching stage,
1b is a rotation speed setting stage, 2 is an operation panel, 10 is a rotating cylinder, 11 is a frequency comparator α, 12 is a frequency comparison: ≦β, 13 is a phase comparator, 14 is a loop filter,
15 is a reference voltage IF, 16 is a motor driver, and 17 is a motor. 6 ] System Hunt Roller 1Q Number of mouths turned side greetings] b' Reverse mouth rank 1 father class fixed attack] 1 round:! 5. Half L comparison] 2 laps: and 1f,, KunF! Ba V 13 Kakan rshi Soft Tet 15 Group 1! ! Electric A Figure 1

Claims (1)

[Claims] In a magnetic recording/reproducing device in which a recording or reproducing head is mounted on a rotary cylinder and the rotary cylinder is rotated to record or reproduce information, a rotation speed setting that sets the rotation speed of the rotary cylinder to a plurality of different rotation speeds. and a rotational speed switching means for selecting from a plurality of different rotational speeds and switching the rotational speed of the rotary cylinder according to the operating mode of the apparatus, and when the recording medium is stopped, the rotational speed switching means A magnetic recording and reproducing apparatus characterized in that the rotational speed of the rotary cylinder is set to a lower rotational speed than during recording and reproducing, and the relative speed between the recording medium and the head is reduced.