JPH07272232A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce wear of a magnetic head and damage of a magnetic tape and to improve reliability. CONSTITUTION:When an ultrasonic motor 14 in a head moving mechanism is moved in the direction of P2, a moving carrier 13 is pushed downward by the prescribed movement quantity, and a magnetic head 8 is protruded to a magnetic tape side. Also, when the ultrasonic motor 14 is moved in the direction of P1, the moving carrier 13 is drawn upward by force of a return spring 12, and the magnetic head 8 is separated from the magnetic tape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording / reproducing apparatus for recording a signal on a recording medium and reproducing the recording signal from the recording medium.

[0002]

2. Description of the Related Art Conventionally, as a signal recording / reproducing apparatus, a recording in which a data signal is magnetically recorded on a tape-shaped recording medium, that is, a magnetic tape, and the recording signal is magnetically read from the recording medium and reproduced. There is a playback device. At the time of recording and reproducing this data, writing and reading of data are performed using a magnetic head. The magnetic head is mounted on the scanner. By rotating the scanner, the magnetic head is moved to a desired position on the magnetic tape.

[0003]

By the way, in this recording / reproducing apparatus, in the case of reading or writing burst data on the magnetic tape, the magnetic head can instantaneously shift to the next data reading or writing operation. In this state, a standby state is established in which the magnetic head is in contact with the magnetic tape. At this time, the scanner is rotating at a high speed while the magnetic head is in contact with the magnetic tape. Moreover, since the magnetic tape is rubbed in the still state, the magnetic tape is damaged. In addition, the chance of head clogs increases and the reliability of the recording / reproducing apparatus is significantly reduced.

In order to avoid this, it is conceivable to remove the unnecessary contact with the magnetic tape by moving the magnetic head. In this case, in the conventional helical scan method, the magnetic head is moved in the radial direction. Therefore, a large force is required to move the rotary magnetic head due to the centrifugal force, but it is not a good idea to incorporate a mechanism for controlling the movement in the rotary magnetic head.

There is also a method of stopping the scanner, but in this case it takes time to shift to the next data read or write operation, and it cannot be said that the magnetic head is in the standby state.

In view of the above situation, the present invention provides a recording / reproducing apparatus capable of reducing wear of a magnetic head and damage of a magnetic tape in a conventional data reading or writing operation.

[0007]

A recording / reproducing apparatus according to the present invention includes a signal reading means having a rotation surface that rotates parallel to a recording medium, and a rotation surface of the signal reading means attached to the signal reading means. The above problem is solved by having a head moving means for moving the magnetic head in a direction perpendicular to the direction and a movement control means for outputting a signal to the magnetic head moving means according to the presence / absence of a data read / write request. .

Here, at the time of reading the data or writing the data, the magnetic head is projected toward the recording medium side, and when the data reading or the data writing is not performed, the magnetic head serves as the recording medium. Evacuate to the other side.

The recording medium is a tape-shaped recording medium.

[0010]

According to the present invention, when there is a data read / write request, the magnetic head is moved in the direction of the recording medium by the head moving means attached to the signal reading means that rotates parallel to the recording medium, and the data reading is performed. / When there is no write request, the magnetic head is moved in the direction opposite to the recording medium.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic configuration of a recording / reproducing unit of a recording / reproducing apparatus according to the present invention.

A magnetic tape 1 which is a recording medium according to the present invention.
1 is sent from the supply reel 1 in the cassette 10 and sent to the scanner 7 at a constant speed by the supply capstan 5 via the supply tension regulator 3. A magnetic head 8 is connected to the scanner 7 via a head moving mechanism 9. The magnetic head 8 is moved up and down by the head moving mechanism 9 so as to contact the magnetic tape 11 only when reading data from the magnetic tape 11 and writing data to the magnetic tape 11. The magnetic tape 11 is read or written by the magnetic head 8 and then sent at a constant speed by the take-up capstan 6 and wound on the take-up reel 2 via the take-up tension regulator 4.

Here, in order to explain the structure of the first embodiment of the head moving mechanism, FIG. 2 is a bottom view of the head moving mechanism 9 in the recording / reproducing apparatus, and FIG. 3 is the head moving mechanism. The side view of the mechanism 9 is shown. The scanner 7 rotates in the direction indicated by the arrow. A head moving mechanism 9 is mounted on the scanner 7, and the magnetic head 8 attached to the head moving mechanism 9 is moved by the head moving mechanism 9 in the axial direction of the scanner 7, that is, an arrow indicated by Y in FIG. Is moved in the direction of.

When reading or writing data,
The magnetic tape 11 is fed in the tape running direction indicated by the arrow. As shown in FIG. 4, when data is written, is sequentially recorded recording track _{TR 1, TR 2, TR 3} , TR 4 ··· magnetization pattern is also data reading, the recorded recording tracks TR ₁ , TR ₂ , TR ₃ ,
Data is sequentially read from TR ₄ . During writing or reading of this data, the magnetic head 8
It is projected to a position where the optimum contact pressure with the magnetic tape 11 can be obtained. On the other hand, when reading or writing of data is not performed, the magnetic head 8 is pulled toward the scanner 7 side by the head moving mechanism 9 so as not to contact the magnetic tape 11, and is retracted.

FIG. 5 is a diagram for explaining the structure of the head moving mechanism 9. When the wedge-shaped ultrasonic motor 14 in the head moving mechanism 9 is moved in the right direction, that is, in the P ₂ direction, the moving carrier 13 is pushed up, so that the moving carrier 13 moves downward by a predetermined moving amount. It is pushed down and fixed. Thereby, the moving carrier 13
The magnetic head 8 mounted on the magnetic tape 11 projects toward the magnetic tape 11 side and contacts the magnetic tape 11. On the other hand, when the ultrasonic motor 14 is moved leftward, that is, in the P ₁ direction, the moving carrier 13 is pulled back upward by the force of the return spring 12, and the magnetic head 8 is pulled away from the magnetic tape 11. The moving amount of the magnetic head 8 at this time is 10 × 10 ⁻⁶
Is about 100 × 10 ⁻⁶ m.

The operation control of the head moving mechanism 9 for controlling the moving operation of the magnetic head 8 will be described with reference to FIGS. 6, 7 and 8.

Schematically, as shown in the flow chart of FIG. 8, it is determined in step S1 whether or not data reading or writing is requested. When data read or write is requested, the magnetic head 8 is ejected in step S2, and when data read or write is not requested, the magnetic head 8 is retracted in step S3.

FIG. 6 is a schematic circuit diagram for controlling the movement of the ultrasonic motor 14 in the head moving mechanism 9. The movement of the ultrasonic motor 14 in the head moving mechanism 9 of FIG. 6 is controlled by a motor drive 16. The motor drive 16 supplies the pulse signal output from the oscillator 17 to the ultrasonic motor 14 based on the control signal from the system controller 15 to move the ultrasonic motor 14.

Specifically, the system controller 1 described above
Based on the data read / write signal output from the motor drive 5, the motor drive 16 outputs a two-phase pulse train to the ultrasonic motor 14. When the data read / write signal of FIG. 7A is turned on from the system controller 15 and is output to the motor drive 16, the motor drive 16 outputs the pulse signal output from the oscillator 17 to the ultrasonic motor 14. It is supplied as a drive pulse for moving in the right direction, that is, the P ₂ direction. In addition, the data read / write signal in FIG.
When F is not output from the system controller 15, the motor drive 16 supplies the pulse signal output from the oscillator 17 as a drive pulse for moving the ultrasonic motor 14 in the left direction, that is, in the P ₁ direction. . The actual reading or writing of data is
When the data read / write signal is ON, the magnetic head 8 is moved by the movement of the ultrasonic motor 14 based on the drive pulse output from the motor drive 16, and then the data is read by the magnetic head 8. Since it is output or written, the recording / reproducing data is output at the timing shown in FIG. 7C.

As a head moving mechanism other than the head moving mechanism described in the above embodiment, FIG. 9 is a diagram for explaining the configuration of the second embodiment of the head moving mechanism, and FIG.
FIG. 0 shows a diagram for explaining the configuration of the third embodiment of the head moving mechanism. In the head moving mechanism shown in FIG. 9, the linear motor 18 controls the movement of the magnetic head 8.
The linear motor 18 is mounted on the scanner 7, and the magnetic head 8 is attached to the linear motor 18.
With this linear motor 18, the magnetic head 8 is moved to Y
The movement is controlled in the arrow direction indicated by.

Further, in the head moving mechanism shown in FIG.
The twin bimorph 20 controls the movement of the magnetic head 8. A twin bimorph 20 is mounted on the scanner 7, and a piezo 19 is provided in the twin bimorph 20. The magnetic head 8 attached to the twin bimorph 20 is controlled to move in the arrow direction indicated by Y by the action of the piezo 19.

Next, FIG. 11 shows a schematic structure of a drive system of the recording / reproducing apparatus. In FIG. 11, the supply reel 1
And the reel servo system that controls the rotation of the take-up reel 2
Supply tension regulator 3, winding tension regulator 4, reel drive circuit 21, reel speed detection unit 2
2, tape tension detector 23, torque calculation circuit 2
4, supply reel motor 25, and take-up reel motor 26
It is composed of

The supply reel motor 25 and the take-up reel motor 26 are driven by the drive control of the reel drive circuit 21, and the supply reel 1 and the take-up reel 2 are rotated. The supply reel motor 25 and the take-up reel motor 2
The generated frequencies (FG signals) from 6 are sent to the reel speed detecting section 22, respectively. The reel speed detector 22 detects the rotation speeds of the supply reel 1 and the take-up reel 2 from the FG signal sent. Further, the tension information from the supply tension regulator 3 and the take-up tension regulator 4 is sent to the tape tension detector 23, respectively. This tape tension detector 2
At 3, the tape tension values of the supply tension regulator 3 and the winding tension regulator 4 are detected from the sent tape tension information.

The rotation speeds of the supply reel 1 and the take-up reel 2 detected by the reel speed detection section 22, and the tapes of the supply tension regulator 3 and the take-up tension regulator 4 detected by the tape tension detection section 23. The tension values are sent to the torque calculation circuit 24. The torque calculation circuit 24 calculates appropriate torque values to be supplied to the supply reel 1 and the take-up reel 2 at each time point based on the value of the reference tension supplied in advance. These calculated torque values are supplied to the reel drive circuit 21. The reel drive circuit 21 controls the rotations of the supply reel 1 and the take-up reel 2 by driving and controlling the supply reel motor 25 and the take-up reel motor 26, respectively, according to the supplied torque value. With such a closed loop, the value of the tape tension in the reel servo system is kept the same as the value of the reference tension.

The capstan servo system for controlling the rotation of the supply capstan 5 and the take-up capstan 6 includes a capstan speed detecting section 27, a phase detecting section 28, a capstan speed calculating circuit 29, and a capstan driving circuit. Three
0, a supply capstan motor 31, a winding capstan motor 32, and a low-frequency component detection circuit (not shown) of a tracking error signal in the signal detection circuit 38.

In the capstan speed detector 27, the supply capstan motor 31 and the take-up capstan motor are generated based on the respective generated frequencies (FG signals) from the supply capstan motor 31 and the take-up capstan motor 32. The rotation speed of 32 is detected. Further, the phase detection unit 28 is supplied with the signal detected by the low frequency component detection circuit of the tracking error signal in the signal detection circuit 38, and the magnetic head 8 tracks the center line of the recording track during signal reproduction. The shift amount of the DC component when controlled is detected.

The rotation speed detected by the capstan speed detecting section 27 and the shift amount detected by the phase detecting section 28 are respectively supplied to the capstan speed calculating circuit 29. The reference speed and the reference phase are previously supplied to the capstan speed calculation circuit 29. The reference speed indicates the optimum speed at which the magnetic tape should run and the value of the tension between the supply capstan 5 and the take-up capstan 6. Further, the reference phase indicates an optimum position when the tracking control is performed. The value of this tension is used to provide an appropriate difference between the torque value of the supply capstan 5 and the torque value of the winding capstan 6 depending on the traveling direction.

In the capstan speed calculation circuit 29, based on the reference speed and the reference phase, the supply capstan motor 31 and the take-up capstan motor 3 at each time point.
The respective suitable speeds to be supplied to each of the two are calculated. These calculated speeds are supplied to the capstan drive circuit 30. In the capstan drive circuit 30, the supply capstan motor 31 and the take-up capstan motor 32 are driven and controlled according to the supplied speed, whereby the supply capstan 5 and the take-up capstan 6 are rotated. .

With such a closed loop, at the time of writing a signal, at a constant speed based on only the number of revolutions of the supply capstan motor 31 and the take-up capstan motor 32 detected by the capstan speed detector 27. A magnetic tape is sent. Further, during signal reproduction, the supply capstan 5 and the winding capstan 6 are rotationally controlled so that the signal is always read out at the center of the recording track, that is, the track center.

The spindle servo system for controlling the rotation speed of the scanner 7 is composed of a spindle speed detection unit 33, a spindle speed calculation circuit 34, a spindle drive circuit 35, and a spindle motor 36. The scanner 7 is rotated when the spindle motor 36 is driven by the drive control of the spindle drive circuit 35 and the belt 41 travels. Generation frequency at this time (F
The G signal) and the pulse (PG signal) are sent to the spindle speed detection unit 33. This spindle speed detection unit 33
Then, the rotation speed of the spindle motor 36 is detected from the sent FG signal and PG signal, and the detected rotation speed is supplied to the spindle speed calculation circuit 34.
The reference speed and the reference phase are sent to the spindle speed calculation circuit 34 in advance, and an appropriate rotation speed to be supplied to the spindle motor 36 is calculated based on the reference speed and the reference phase. The calculated rotation speed is sent to the spindle drive circuit 35, and the spindle drive circuit 35 controls the drive of the spindle motor 36 by the sent speed. As a result, the spindle motor 36 is rotated and the belt 41 travels at an appropriate speed, whereby the scanner 7 is rotated.

Further, the read signal from the magnetic head 8 is sent to the signal detection circuit 38, the servo signal detection section 39, and the servo drive circuit 40. The signal detection circuit 3
Reference numeral 8 includes a read laser signal detection circuit, a focus error signal detection circuit, and a tracking error signal detection circuit.

At the time of signal reproduction, the focus error signal and the tracking error signal, which are servo signals necessary for accurate position control of the laser beam, detected in the signal detection circuit 38 are sent to the servo signal detection unit 39. A reference value for controlling the movement of the laser beam to an accurate recording track position is sent to the servo signal detecting section 39, and the optimum focus signal and tracking signal are calculated based on this reference value. The calculated focus signal and tracking signal are supplied to the servo drive circuit 40. The servo drive circuit 40 receives the supplied focus signal and tracking signal from the signal detection circuit 38.
By returning to a tracking / focus control actuator (not shown), the signal detection circuit 38 accurately controls the track position of the magnetic head 8. With such a closed loop, the magnetic head 8 is controlled to move to an accurate recording track.

The recording / reproducing apparatus according to the present invention is provided with the drive system as described above, so that at the time of signal recording, the magnetic head 8 is moved to a desired position on the magnetic tape 11,
The signal pattern is recorded by being projected and contacted with the magnetic tape 11 side. Further, during signal reproduction, the magnetic head 8 is accurately scanned to move the magnetic head 8 to a desired position on the magnetic tape 11 and then projected and contacted to the magnetic tape 11 side to read out a recorded signal pattern. You can Further, the magnetic head 8 is pulled away from the magnetic tape 11 and retracted except during signal recording or reproduction.

[0034]

As is apparent from the above description, the recording / reproducing apparatus according to the present invention is provided with the signal reading means whose rotating surface rotates parallel to the recording medium, and the signal reading means attached to the signal reading means. By having a head moving means for moving the magnetic head in a direction perpendicular to the rotation surface of the signal reading means, and a movement control means for outputting a signal to the magnetic head moving means according to the presence / absence of a data read / write request. The wear of the magnetic head during standby and the damage of the magnetic tape in the still state can be reduced, and the reliability is improved.

Further, it is possible to construct a system capable of recording and reproducing with high reliability for burst data and data whose data rate changes with time. In the future, it will be common to handle data whose information amount changes sequentially, and it is possible to provide a recording / reproducing apparatus that can be used for this general purpose.

Since the recording medium is a tape-shaped recording medium, it is possible to record a huge amount of information together with high density recording.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a recording / reproducing unit of a recording / reproducing apparatus according to the present invention.

FIG. 2 is a bottom view of a head moving mechanism.

FIG. 3 is a side view of a head moving mechanism.

FIG. 4 is a diagram showing a signal recording state on a magnetic tape.

FIG. 5 is a diagram for explaining the schematic configuration of the first embodiment of the head moving mechanism.

FIG. 6 is a circuit diagram for movement control of an ultrasonic motor in the head movement mechanism.

FIG. 7 is a diagram showing a signal state during movement control of an ultrasonic motor in a head moving mechanism.

FIG. 8 is a flowchart of control of a head moving mechanism.

FIG. 9 is a diagram for explaining a schematic configuration of a second embodiment of the head moving mechanism.

FIG. 10 is a diagram for explaining the schematic configuration of the third embodiment of the head moving mechanism.

FIG. 11 is a block diagram showing a schematic configuration of a drive system of the recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

 7 Scanner 8 Magnetic Head 9 Head Moving Mechanism 11 Magnetic Tape 12 Return Spring 13 Moving Carrier 14 Ultrasonic Motor 15 System Controller 16 Motor Drive 17 Oscillator

Claims (2)

[Claims] 1. A recording / reproducing apparatus for recording / reproducing data on / from a recording medium using a magnetic head, the signal reading means having a rotating surface rotating parallel to the recording medium, and the signal reading means attached to the signal reading means. A head moving means for moving the magnetic head in a direction perpendicular to the rotation surface of the signal reading means, and a movement control means for outputting a signal to the magnetic head moving means in response to the presence / absence of a data read / write request. Characteristic recording / reproducing device. 2. The recording / reproducing apparatus according to claim 1, wherein the recording medium is a tape-shaped recording medium.