JP2001155450A - Recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recording and reproducing device for varying a power supply voltage to be supplied to a driver between the case of seeking a head and the case of following it. SOLUTION: In this recording and reproducing device provided with a means for driving the head for recording information in a medium or reproducing the recorded information for performing the seek operation of the head to the target position of the medium and performing follow operation by the driving means and thus recording the information or reproducing the recorded information, the means for varying the power supply voltage to be supplied to the driving means between the time of the seek operation of the head and the time of the follow operation is provided and it is varied to the lower voltage at the time of the follow operation compared with the time of the seek operation. In the recording and reproducing device provided with a driving means for driving the head for recording the information in the medium or reproducing the recorded information, the means for varying the power supply voltage to be supplied to the driving means corresponding to power required for driving the head is provided.

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, and more particularly, to a recording / reproducing apparatus having means for varying a power supply voltage supplied to a driving means for driving a head during a seek operation and a follow operation.

[0002]

2. Description of the Related Art Conventionally, a magnetic recording / reproducing apparatus uses a DC brushless motor or the like as a spindle motor for rotating a magnetic recording medium such as a magnetic disk, and uses a voice coil motor or the like as an actuator for driving a magnetic head.

The spindle motor is driven by applying a substantially constant voltage in order to keep the rotation speed of the magnetic recording medium constant. On the other hand, voice coil motors
A high voltage is required during the seek operation of the magnetic head,
At the time of the follow operation of the magnetic head, it is sufficient that the voltage is lower than the voltage required at the time of the seek operation.

[0004]

However, in the prior art, the driver for driving the voice coil motor is driven by a constant power supply voltage of, for example, 12 V without distinction between the seek operation and the follow operation. During the follow-up operation, the driver wasted power. In addition, the power consumption of the driver puts a heavy load on the power supply.

Further, the power consumed by the driver is converted into thermal energy, which causes a rise in the temperature of the magnetic recording / reproducing apparatus, which may lower the element identification of a semiconductor device provided inside the magnetic recording / reproducing apparatus. .

It is therefore an object of the present invention to provide a recording / reproducing apparatus which varies a power supply voltage to be supplied to a driver when a head is sought and when a head is followed.

Another object of the present invention is to reduce the power consumption of a recording / reproducing apparatus.

[0008]

In order to solve the above-mentioned problems, the present invention comprises means for driving a head for recording information on a medium or reproducing the recorded information, and the driving means controls the head by the driving means. In a recording / reproducing apparatus which performs a seek operation at a target position on a medium and performs a follow operation to record information or reproduce the recorded information, the head is supplied to the drive unit during a seek operation and during a follow operation. A variable means for varying a power supply voltage to be applied, the voltage being varied to a lower voltage in the follow operation than in the seek operation.

Further, the present invention relates to a recording / reproducing apparatus having a driving means for driving a head for recording information on a medium or reproducing the recorded information, wherein the driving is performed in accordance with the power required for driving the head. Means for varying the power supply voltage supplied to the means.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an internal configuration diagram of a magnetic recording / reproducing apparatus according to an embodiment of the present invention. The magnetic recording / reproducing apparatus shown in FIG. 1 includes a voice coil motor 1 that moves a magnetic head (not shown), a voice coil motor driver 5 that is driven by supplying a current to the voice coil motor 1, and a microprocessor (microprocessing unit: hereinafter). , "MP
U ". 2) a D / A converter 6 for converting a digital voltage command signal output from 2 into an analog value. The magnetic recording and reproducing apparatus shown in FIG.
A variable power supply circuit 4 for varying a power supply voltage to be supplied to the voice coil motor driver 5 between a seek operation and a follow operation of the magnetic head based on a voltage command signal converted to an analog value by the / A converter 6; A D / A converter 3 for converting a digital voltage signal from the MPU 2 into an analog value. The voltage signal output from the MPU commands the current value of the current supplied to the voice coil motor 1.

In this embodiment, a magnetic recording / reproducing apparatus for storing information handled by a desktop computer or the like on a 3.5 ″ type magnetic disk will be described as an example.
The magnetic recording / reproducing device is supplied with power of 5 V and 12 V from the desktop computer side.

FIG. 2 shows an MPU of the magnetic recording / reproducing apparatus of FIG.
2, a voltage value command signal output from the D / A converter 6 and converted from a digital value to an analog value, a variable power supply voltage signal generated based on the voltage value command signal and supplied to the voice coil motor driver 5; FIG. 4 is a diagram showing a drive current supplied from the voice coil motor driver 5 to the voice coil motor 1.

As shown in FIG. 2, the voltage value command signal converted into an analog value by the D / A converter 6 and output to the variable power supply circuit 4 includes a signal for a seek operation of the magnetic head and a signal for a follow operation. The signal for the seek operation of the magnetic head is a signal for applying a power supply voltage of, for example, about 12 V to the voice coil motor driver 5.
The signal for the follow operation is a signal for applying a power supply voltage of, for example, about 6 V to the voice coil motor driver 5.

The voice coil motor 1 is supplied with a current of about several tens mA during the follow operation of the magnetic head. This takes into account disturbance applied to the magnetic head. During the seek operation, a drive current of about 1 A at maximum is supplied. If the drive current is, for example, positive during acceleration of the magnetic head, it becomes negative during deceleration.

FIG. 3 is an internal configuration diagram of the variable power supply circuit 4. The variable power supply circuit 4 includes a comparator 10 that compares the level of a voltage value command signal output from the MPU 2 and converted from a digital value into an analog value by the D / A converter 6 and a variable power supply voltage signal fed back, 100kHz
an oscillation circuit 15 that outputs an oscillation signal having a frequency of about z;
The output signal of the oscillation circuit 15 and the output signal of the comparator 10 are A
A logic element 16 for performing ND logic operation. In addition,
The comparator 10 has, for example, a hysteresis characteristic.

The MOS switch 11 having a gate that is turned on / off by an output signal of the logic element 16
And an inductor 12 that generates a back electromotive force when the gate of the MOS switch 11 is turned off, and a capacitor 14 that accumulates charges transmitted through the diode 13 by the back electromotive voltage to generate a variable power supply voltage. ing.

FIG. 4 is an explanatory diagram of the operation of FIG. 3, showing the output signal of the comparator 10, the output signal of the oscillation circuit 15, the output signal of the logic element 16, and the output signal of the variable power supply circuit 4. . First, a voltage command signal output from the MPU 2 and a fed back variable power supply voltage signal are input to the comparator 10.

When the amplitude of the variable power supply voltage signal fed back is greater than the voltage command signal converted by the D / A converter 6, the output signal of the comparator 10 is set to LOW. . When the output signal of the comparator 10 is LOW, the output signal of the logic element 16 becomes LOW, and the gate of the MOS switch 11 is turned off.

At this time, no current is supplied to the inductor 12, and a current is supplied to the voice coil motor driver 5, which is a load of the variable power supply circuit 4, by electric charges accumulated in the capacitor 14. Since the charge stored in the capacitor 14 decreases with time, the amplitude of the variable power supply voltage signal decreases.

Then, the amplitude of the variable power supply voltage signal fed back becomes smaller than the amplitude of the voltage value command signal converted by the D / A converter 6, and the output signal of the comparator 10 becomes HIGH. The output signal of the comparator 10 is H
When it becomes IGH, the output signal of the logic element 16 becomes the oscillation circuit 1
5 depends on the output signal. Therefore, based on the frequency of the output signal of the oscillation circuit 15, the MOS switch 1
One gate is turned on / off.

When the gate of MOS switch 11 is turned on, power supply voltage Vcc is applied to inductor 12 and M
A current flows to the OS switch 11 side. Next, when the gate of the MOS switch 11 is turned off, a back electromotive force is generated in the inductor 12 and the capacitor 1 is connected via the diode 13.
4 and a voice coil motor driver 5. Thus, the ON / OFF of the gate of the MOS switch 11
The charge stored in the capacitor 14 is increased by repeating the turning off.

As the amount of charge stored in the capacitor 14 increases, the amplitude of the variable power supply voltage signal increases,
Becomes LOW again. Therefore, the comparator 10
Becomes LOW, and the above series of operations is repeated. Thus, the variable power supply circuit 4 supplies the voice coil motor driver 5 with a constant variable power supply voltage boosted in accordance with the voltage value command signal output from the MPU 2. When it is desired to increase the level of the variable power supply voltage, the amplitude of the voltage command signal is increased, and when it is desired to decrease, the amplitude of the voltage command signal is decreased.

FIG. 5 is an internal configuration diagram of the voice coil motor driver 5. Voice coil motor driver 5
An integrator 30 for integrating a difference between a voltage signal converted by the D / A converter 3 and a voltage signal applied to a sense resistor 38 input via a differential amplifier 33;
A gain amplifier 31 amplifies the integrated signal integrated by the amplifier and drives the PMOS 34 or the NMOS 35, and a gain amplifier 32 amplifies the integrated signal and drives the NMOS 36 or the PMOS 37.

The voice coil motor driver 5 has a D / A
The difference between the voltage signal converted by the converter 3 and the voltage signal applied to the sense resistor 38 input via the differential amplifier 33 is integrated by the integrator 30. The integration signal output from integrator 30 is output to gain amplifiers 31 and 32, respectively.

When the integration signal has, for example, a positive polarity, the output signal of the gain amplifier 31 turns on the gate of the PMOS 34 and turns off the gate of the NMOS 35.
The output signal of the gain amplifier 32 turns off the gate of the PMOS 37 and turns on the gate of the NMOS 36. At this time, the variable power supply circuit 4, the PMOS 34, the sense resistor 3
8, a current flows through the path of the voice coil motor 1, the NMOS 36 and the ground.

On the other hand, when the integration signal has, for example, a negative polarity, the output signal of the gain amplifier 31
4 is turned off, the gate of the NMOS 35 is turned on,
In addition, the output signal of the gain amplifier 32 causes a PMOS
The gate of 37 is turned on, and the gate of NMOS 36 is turned off.

At this time, the variable power supply circuit 4 and the PMOS 3
7, voice coil motor 1, sense resistor 38, NMOS
Current flows through the path of 35 and ground. in this way,
The voice coil motor driver 5 supplies a current according to the current command value to the voice coil motor 1.

Next, the operation of the magnetic recording / reproducing apparatus shown in FIG. 1 will be described. First, the MPU 2 determines the actual position of the magnetic head for performing a follow operation or a seek operation of the magnetic head based on a command for recording information output from a higher-level device (not shown) or a command for reproducing the recorded information. The distance from the target position is measured, and an operation for moving the magnetic head to the target position is performed.

During the follow operation of the magnetic head, the MPU 2
Outputs a digital value voltage signal based on the above calculation result to the D / A converter 3. The D / A converter 3 converts an arithmetic processing result, which is an input digital value, into an analog value.

At this time, the variable power supply circuit 4
Outputs the voltage value command signal necessary for the follow operation,
The digital value is converted into an analog value by the D / A converter 6. At the time of the follow operation, a voltage command signal for applying, for example, 6 V to the voice coil motor driver 5 is output. This is because the power supply voltage of the voice coil motor driver 5 may be lower during the seek operation than during the follow operation.

The variable power supply circuit 4 applies a voltage of, for example, about 6 V to the voice coil motor driver 5 based on this signal. The voice coil motor driver 5 is driven by a variable power supply voltage of, for example, about 6 V supplied from the variable power supply circuit 4, and converts a driving current based on a current command signal converted into an analog value by the D / A converter 3 into a voice coil. Supply to motor 1.

Next, during the seek operation of the magnetic head,
A voltage signal of a digital value based on the result of the compensation operation is output from the MPU 2 to the D / A converter 3. The D / A converter 3 converts the arithmetic processing result that is the input digital value into
Convert to analog value.

At this time, the variable power supply circuit 4
Outputs a voltage command signal required for the seek operation,
The digital value is converted into an analog value by the / A converter 6. During the seek operation, a voltage command signal for applying, for example, 12 V to the voice coil motor driver 5 is output. This is because the power supply voltage of the voice coil motor driver 5 needs to be increased in the seek operation for moving the magnetic head at high speed.

The variable power supply circuit 4 applies a voltage of, for example, about 12 V based on this signal to the voice coil motor driver 5.
Apply to The voice coil motor driver 5 is driven by a variable power supply voltage of, for example, about 12 V supplied by the variable power supply circuit 4 and converts a driving current based on a current command signal converted into an analog value by the D / A converter 3 into a voice coil. Supply to motor 1.

Thereafter, after the magnetic head is sought to the target position, the follow operation is performed again according to the procedure described above.

FIG. 6 shows the structure of the magnetic recording / reproducing apparatus shown in FIG.
It is a figure showing signs that power consumption was controlled. FIG. 6 shows the variable power supply voltage output from the variable power supply circuit 4 and the voltage applied to the voice coil motor 1. For comparison, a power supply voltage (12 V) of the related art is also shown.

As shown in FIG. 6, when the magnetic recording / reproducing apparatus of this embodiment follows the magnetic head,
Since the power supply voltage to be supplied to the voice coil motor driver 5 is lower than during the seek operation, it can be seen that power consumption can be reduced by multiplying the hatched voltage by the current flowing through the voice coil motor 1. .

As described above, in the present embodiment, the magnetic recording / reproducing apparatus has 5V and 12V from the desktop computer side.
Has been described as an example, the information handled by the notebook computer is, for example, 2.
The present invention is also applicable to a magnetic recording / reproducing apparatus that stores data on a 5 ″ type magnetic disk.

In this case, the magnetic recording / reproducing apparatus is supplied with power of 5 V from the notebook computer side, and the variable power supply circuit 4 may be of the type shown in FIG. 7, for example.

The variable power supply circuit of FIG. 7 changes the voltage applied to the voice coil motor driver 5 by lowering the power supply voltage Vcc. The variable power supply circuit illustrated in FIG. 7 includes a logic element 17 that performs a NAND logic operation on an output signal of the oscillation circuit 15 and an output signal of the comparator 10, and a MOS having a gate whose on / off is controlled by the output signal of the logic element 17. And a switch 18. Note that FIG.
The same reference numerals are given to the same parts as.

The variable power supply circuit 4 shown in FIG.
When the output signal is high (when the voltage command signal is larger), the gate of the MOS switch 18 is turned on / off according to the output signal of the oscillation circuit 15. Then, the voltage signal smoothed by the inductor 12 and the capacitor 14 is output to the voice coil motor driver 5.

As the variable power supply circuit 4, both the one shown in FIG. 2 and the one shown in FIG. 6 may be used. That is, a voltage signal is generated by the one shown in FIG. 2 during the seek operation, and a voltage signal is generated by the one shown in FIG. 6 during the follow operation.

Further, in the present embodiment, the case where the output from the variable power supply circuit 4 is switched between the seek operation and the follow operation has been described as an example. However, in order to further reduce power consumption, the output to the target track is reduced. When the distance is long, after the magnetic head is accelerated to the maximum speed, the voice coil motor driver 5 may be driven by a low voltage to move the magnetic head at a constant speed.

In this embodiment, the case where the present invention is applied to a magnetic recording / reproducing apparatus has been described as an example, but the present invention can be similarly applied to an optical recording / reproducing apparatus.

[0046]

As described above, in the recording / reproducing apparatus of the present invention, the power supply voltage applied to the means for driving the head is changed to be lower in the follow operation than in the seek operation, thereby reducing power consumption. be able to.

Further, according to the present invention, since the power supply voltage supplied to the driving means is varied according to the power required for driving the head, further reduction in power consumption can be realized.

[Brief description of the drawings]

FIG. 1 is an internal configuration diagram of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing signals between components of the magnetic recording / reproducing apparatus of FIG.

FIG. 3 is an internal configuration diagram of the variable power supply circuit 4.

FIG. 4 is an explanatory diagram of the operation in FIG. 3;

5 is an internal configuration diagram of the voice coil motor driver 5. FIG.

FIG. 6 is a diagram illustrating a state in which power consumption is suppressed by the magnetic recording / reproducing apparatus of FIG. 1;

FIG. 7 is an internal configuration diagram of a variable power supply circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Voice coil motor 2 MPU 3 D / A converter 4 Variable power supply circuit 5 Voice coil motor driver 10 PWM generation circuit 11 MOS switch 12 Inductor 13 Diode 14 Capacitor 15 Internal power supply 30 Adder 31, 32 Gain amplifier 33 Differential amplifier 34 , 37 P-channel MOSFET 35, 36 N-channel MOSFET 38 Sense resistor

Claims (3)

[Claims] 1. A drive unit for driving a head for recording information on a medium or reproducing the recorded information, the head unit performs a seek operation to a target position of the medium by the drive unit, and performs a follow operation. A recording / reproducing apparatus that records information or reproduces the recorded information, comprising: a variable unit configured to vary a power supply voltage supplied to the driving unit during a seek operation and a follow operation of the head; A recording / reproducing apparatus wherein the voltage is sometimes changed to a voltage lower than that during the seek operation. 2. A recording / reproducing apparatus comprising a driving unit for recording information on a medium or driving a head for reproducing the recorded information, wherein the recording medium is supplied to the driving unit in accordance with electric power required for driving the head. A recording / reproducing apparatus comprising means for varying a power supply voltage. 3. The recording / reproducing apparatus according to claim 1, wherein the variable means varies the voltage by increasing or decreasing the voltage.