JPH0610526Y2 - Magnetic tape recording / playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention drives a rotating reel by a reel motor and a capstan by a capstan motor, runs a magnetic tape, and records / reproduces, for example, video information and audio information. The present invention relates to a magnetic tape recording / reproducing apparatus, and more particularly to a magnetic tape recording / reproducing apparatus including a servo mechanism for rotationally driving a rotating reel and a capstan at a desired speed.

2. Description of the Related Art In a magnetic tape recording / reproducing apparatus, a capstan is driven by a capstan motor and a rotating reel is driven by a reel motor, and a magnetic tape is driven to drive, for example, recording / reproducing of video information, audio information and the like. ing.

During recording / reproduction, the capstan rotation speed is kept constant by the capstan servo mechanism. Further, when fast-forwarding, rewinding, and searching for specific information among recorded information, the magnetic tape is not driven by the capstan but only by the rotary reel. At this time, the rotation speed of the rotating reel is kept constant by the rotating reel servo mechanism provided separately from the capstan servo mechanism. This rotary reel servo mechanism is not used during recording / reproduction.

Problems to be Solved by the Invention In the above-mentioned conventional magnetic tape recording / reproducing apparatus, the circuit configuration is complicated because two independent servo mechanisms are used. Further, since only one of the servo mechanisms is selectively used, it is extremely wasteful.

An object of the present invention is to provide a magnetic tape recording / reproducing apparatus having a servo mechanism which has a simple circuit configuration and is used efficiently.

Means for Solving the Problems According to the present invention, a rotary reel around which a magnetic tape is wound is rotationally driven by a rotary reel driving means, and a capstan is rotationally driven by a capstan driving means, so that the magnetic tape is driven at a desired speed. In a magnetic tape recording / reproducing apparatus that is run by, the rotating reel rotation state detecting means for detecting the rotation state of the rotating reel, the capstan rotation state detecting means for detecting the rotation state of the capstan, and the detection means outputs The signal converting means for converting the drive signal to the rotating reel driving means or the capstan driving means, and the output of the capstan rotation state detecting means to the signal converting means at the time of recording / reproducing, and the output of this signal converting means It is given to the stun drive means to drive the capstan to rotate at a constant rotation speed, and fast forward, rewind, and fast forward are performed. And a selection means for giving the output of the rotating reel rotation state detecting means to the signal converting means and giving the output of the signal converting means to the rotating reel driving means to rotate the rotating reel. A magnetic tape recording / reproducing apparatus characterized by the following.

In the present invention, the rotating reel rotation state detecting means detects the rotating state of the rotating reel, and the capstan rotation state detecting means detects the rotating state of the capstan. The output of each of the detection means is selectively input to the signal conversion means by the selection means, and the signal conversion means converts the input output of the detection means into a drive signal to the rotation reel drive means or the capstan drive means. . That is, (a) at the time of recording / reproducing, the output of the capstan rotation state detecting means is given to the signal converting means, and the output drives the capstan to rotate at a constant rotation speed, and (b) fast forward, rewind, and those. At the time of cueing, the output of the rotating reel rotation state detecting means is given to the signal converting means to drive the rotating reel, and thus the signal converting means can be shared in the respective operations a and b. become. As a result, an efficient servo mechanism can be realized and the circuit configuration of the magnetic tape recording / reproducing apparatus can be simplified.

Embodiment FIG. 1 is a block diagram showing a basic configuration around a servo mechanism of a magnetic tape recording / reproducing apparatus 1 which is an embodiment of the present invention. The magnetic tape 2 is wound around a supply reel 3, which is a rotating reel, and is wound around a take-up reel 4, which is also a rotating reel, for recording / reproduction. The magnetic tape 2 is guided by guides 5, 6, 7 and a capstan 8 and slidably contacts a rotary head 9.

The supply reel 3 is rotationally driven in the direction of arrow R1 by the reel motor 10 that is a rotary reel driving means when rewinding and cueing by rewinding, and is inactive in other cases. . The reel motor 10
In connection with the above, a rotation state detection unit 11 which is a rotation reel rotation state detection unit is provided, and the rotation state detection unit 11 outputs a signal of a frequency corresponding to the rotation speed of the reel motor 10. The take-up reel 4 is rotationally driven in the direction of arrow R2 by the reel motor 12 which is also a rotary reel driving means when recording / reproducing, fast-forwarding, and cueing by fast-forwarding are performed. In other cases, it is in the inactive state. It is said that The reel motor 12 is provided with a rotation state detection unit 13 which is also a rotation reel rotation state detection means, and the rotation state detection unit 13 outputs a signal of a frequency corresponding to the rotation speed of the reel motor 12. Output.

The capstan 8 is rotationally driven in the arrow R3 direction by a capstan motor 14 which is a capstan drive means. In relation to the capstan motor 14, a rotation state detecting section 15 which is a capstan rotation state detecting means is provided, and the rotation state detecting section 15 is provided in the capstan motor 1.
The signal of the frequency corresponding to the rotation speed of 4 is output.

The capstan 8 contacts the pinch roller 16 via the magnetic tape 2 at the time of recording / reproducing, whereby the magnetic tape 2 is driven to run in the arrow R4 direction. Also fast forward,
At the time of rewinding and cueing, the capstan 8 is separated from the magnetic tape 2.

The rotation state detecting units 11, 13 and 15 are realized by, for example, Hall elements.

The reel motor 10 is activated when rewinding and cueing by rewinding, and is deactivated otherwise. The rotation state detection unit 11 is activated / deactivated according to the active / inactive state of the reel motor 10.

The reel motor 12 is activated when recording / reproducing, fast-forwarding, and cueing by fast-forwarding are performed, and in other cases, the reel motor 12 is deactivated. In addition, the rotation state detection unit 13
Are activated / deactivated according to the active / inactive state of the reel motor 12.

In this way, the magnetic tape 2 is recorded / reproduced, fast-forwarded,
When the cue is performed by fast-forwarding, the vehicle travels in the arrow R4 direction, and when the rewinding and the cueing by rewinding are performed, the vehicle travels in the arrow R5 direction.

The output signal of the rotation state detecting unit 15 is amplified by the amplifier circuit 18 and given to the input terminal T1 of the switch circuit 20 which is the selecting means. The signals output from the rotation state detectors 11 and 13 are amplified by the amplifier circuit 19 and given to the input terminal T2 of the switch circuit 20. The switching of the switch circuit 20 is controlled by the control circuit 22 as described later.

The output terminal T3 of the switch circuit 20 is supplied to a frequency-voltage (hereinafter abbreviated as FV) conversion circuit 21 which is a signal conversion means. The FV conversion circuit 21 outputs a signal having a voltage corresponding to the difference between the reference frequency determined as described later and the frequency of the input signal. This output signal is given to the input terminal T4 of the switch circuit 23. F-V conversion circuit 21
The reference frequency is changed by the control circuit 22 as described later.

The switch circuit 23 has an input terminal T4 in addition to the input terminal T4.
5, and has output terminals T6 and T7. Output terminal T6
Is connected to the reel motor drive circuit 24, and the output terminal T
7 is connected to a capstan motor drive circuit 25.
A constant level voltage is applied from the constant voltage generating circuit 26 to the input terminal T5. In the switch circuit 23, when the input terminal T4 is connected to the output terminal T7, there is conduction between the input terminal T5 and the output terminal T6, and when the input terminal T4 is connected to the output terminal T6, the input terminal T5, the output The terminals T6 are cut off. The operation of the switch circuit 23 is controlled by the control circuit 22 as described later.

The capstan motor drive circuit 25 supplies electric power according to the given signal to the capstan motor 14, and the reel motor drive circuit 24 selectively supplies electric power according to the given signal to the reel motors 10 and 12. Supply.

When recording / reproducing, the capstan 8 is the magnetic tape 2
It contacts the pinch roller 16 via. At this time, the reel motor 10 is in the inactive state, and the reel motor 12 and the capstan motor 14 are in the active state. At this time, the magnetic tape 2 travels in the direction of arrow R4 at a speed determined by the rotation speed of the capstan 8, and the rotary head 9 rubs the magnetic tape 2 to record / reproduce information.

At this time, the switch circuit 20 is controlled by the control circuit 22 so that its input terminal T1 is connected to the output terminal T3. Therefore, the F-V conversion circuit 21 is given a signal of a frequency corresponding to the rotation speed of the capstan motor 14 from the rotation state detection unit 15 via the amplification circuit 18. At this time, the F-V conversion circuit 21 controls the reference circuit so that the reference frequency becomes equal to the frequency of the output signal of the rotation state detection unit 15 corresponding to the rotation speed of the capstan motor 15 appropriate for recording / reproducing. 22 is set.

The voltage corresponding to the difference between this reference frequency and the frequency of the output signal of the rotation state detection unit 15 is given to the input terminal T4 of the switch circuit 23 as an error signal. Switch circuit 2
At this time, 3 is controlled by the control circuit 22 so that the input terminal T4 is connected to the output terminal T7 and the input terminal T5 and the output terminal T6 are electrically connected.

Therefore, the error signal is given to the capstan motor driving circuit 25, and the capstan motor driving circuit 25
Increases or decreases the power supplied to the capstan motor 14 in accordance with the given error signal. Reel motor drive circuit 2
4 is supplied with a constant level voltage, so that the reel motor 12 is supplied with constant power.
No electric power is supplied to the reel motor 10, and the reel motor 10 is deactivated. As described above, the rotation speed of the capstan motor 14 is kept constant, so that the running speed of the magnetic tape 2 is kept constant.

When performing fast-forwarding, rewinding, and cueing, the capstan 8 is separated from the magnetic tape 2, and therefore the running speed of the magnetic tape 2 is determined by the rotation speeds of the reel motors 10 and 12.

When fast-forwarding and cueing by fast-forwarding are performed, the reel motor 12 is in the active state and the reel motor 10 is in the inactive state. At this time, by the control circuit 22,
The switch circuits 20 and 23 and the F-V conversion circuit 21 are
The operating state is set as follows. That is, in the switch circuit 20, the input terminal T2 is connected to the output terminal T3. In the FV conversion circuit 21, the reference frequency is set equal to the frequency of the output signal of the rotation state detection unit 13 corresponding to the appropriate rotation speed of the reel motor 12. In the switch circuit 23, the input terminal T
4 is connected to the output terminal T6, and the input terminal T5 and the output terminal T6 are disconnected.

Therefore, the error signal output from the F-V conversion circuit 21 corresponds to the rotation error of the reel motor 12, and this error signal is given to the reel motor drive circuit 24, and the reel motor drive circuit 24 causes the reel motor 12 to operate. The applied power is increased or decreased according to the error signal. This keeps the rotation speed of the reel motor 12 constant. No electric power is supplied to the reel motor 10 at this time.

When performing rewinding and cueing by rewinding, the reel motor drive circuit 24 supplies electric power to the reel motor 10,
No electric power is supplied to the reel motor 12. The settings and operations of the other circuits are the same as those in the case of performing fast forward and cueing by fast forward.

As described above, in the present embodiment, the switch circuit 20 causes the F-V conversion circuit 21 to output the output signal of the rotation state detection unit 15 via the amplification circuit 18 and the rotation state detection unit 11 via the amplification circuit 19 or the rotation state detection unit 11. The output signal of the state detection unit 13 is selectively input. The F-V conversion circuit 21 has a reference frequency of the magnetic tape recording / reproducing apparatus 1
Of the capstan motor 14 and the reel motors 10 and 12 according to the error signal output from the F-V conversion circuit 21. Stan 8, supply reel 3,
The rotation speed of the take-up reel 4 is kept constant. As a result, the circuit configuration of the magnetic tape recording / reproducing apparatus 1 is simplified and the servo mechanism thereof can be efficiently driven.

Effects As described above, according to the present invention, the circuit configuration of the magnetic tape recording / reproducing apparatus can be simplified, and the servo mechanism thereof can be efficiently driven.

That is, according to the present invention, (a) during recording / reproduction,
The output of the capstan rotation state detecting means is applied to the signal converting means, and the output of the signal converting means drives the capstan to rotate at a constant rotation speed, and (b) the fast-forwarding, rewinding, and the cueing thereof are rotated. Since the output of the reel rotation state detecting means is given to the signal converting means to drive the rotating reel to rotate, the signal converting means can be shared in each of the operations a and b, and the circuit configuration can be simplified. You will be able to

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic structure around a servo mechanism of a magnetic tape recording / reproducing apparatus 1 which is an embodiment of the present invention. 1 ... Magnetic tape recording / reproducing device, 2 ... Magnetic tape,
3 ... Supply reel, 4 ... Take-up reel, 8 ... Capstan, 10, 12 ... Reel motor, 11, 13, 1
5 ... Rotation state detection unit, 14 ... Capstan motor,
20, 23 ... Switch circuit, 21 ... F-V conversion circuit, 22 ... Control circuit

Claims (1)

[Scope of utility model registration request] 1. A magnetic tape recording / rotating device in which a rotary reel around which a magnetic tape is wound is rotationally driven by a rotary reel driving means, and a capstan is rotationally driven by a capstan driving means to run the magnetic tape at a desired speed. In the reproducing apparatus, the rotating reel rotation state detecting means for detecting the rotating state of the rotating reel, the capstan rotating state detecting means for detecting the rotating state of the capstan, and the output of each detecting means are used as the rotating reel driving means or the capstan. A signal converting means for converting into a driving signal to the driving means, and at the time of recording / reproducing, the output of the capstan rotation state detecting means is given to the signal converting means, and the output of this signal converting means is given to the capstan driving means, When the capstan is driven to rotate at a constant rotation speed, fast forward, rewind, and cueing by fast forward and rewind A magnetic tape recording means for supplying the output of the rotating reel rotation state detecting means to the signal converting means, and supplying the output of the signal converting means to the rotating reel driving means for rotating the rotating reel. / Playback device.