JPH03237601A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To improve reliability and to prolong a life by synchronizing the supply and disconnection of power for a write/read circuit with the start/stop of a motor rotating a magnetic disk. CONSTITUTION:When a motor driving circuit 8 operates by a signal line 13, power is applied to the motor 5 through a signal line 17 and the motor 5 starts rotating, a signal is transmitted to a power control circuit 4 by the signal line 13. Thus, a power voltage is applied to the write/read circuit 3 by a signal line 14. The motor 5 is stopped by permitting the motor driving circuit 8 to stop the supply of power to the motor 5 by the signal line 13. At the same time, the power control circuit 4 stops the application of the power supply voltage to the write/read circuit 3 by the signal line 13. Consequently, the rise of temperature in a circuit element in a state where there is no wind by rotation can be suppressed. Thus, the reliability and the life of the write/read circuit in HDA can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device having a magnetic disk which is a rotating disc-shaped storage medium, and particularly relates to a magnetic disk device and a device for recording and reproducing data on the magnetic disk. A magnetic head, which is a transducer, and a write/read circuit are installed in a magnetic disk device housed in a dust-proof sealed structure.

[Conventional technology]

In a conventional magnetic disk drive having a dust-proof sealed structure (HDA) that seals and houses a magnetic disk, a magnetic head, and a write/read circuit, power is supplied and disconnected to the write/read circuit in the HDA.
This is done simultaneously with the supply and disconnection of power to the electronic circuit provided outside A, and is done independently of the start of rotation of the magnetic disk.

[Problem to be solved by the invention]

As described above, in conventional magnetic disk drives, power is supplied to the read/write circuit in the HDA even when the rotation of the magnetic disk is stopped. The read/write circuit in an HDA is generally placed near the magnetic head to improve recording and reproducing performance, and is constructed using integrated circuits as circuit elements to make it compact and lightweight. Therefore, it is necessary to suppress self-heating to maintain reliability and longevity. When the magnetic disk is rotating, a significant amount of air is directed to the read/write circuitry within the HDA, thereby keeping the temperature of the circuit elements low. However, when the magnetic disk is in a stopped state, no wind is generated due to the rotation of the magnetic disk, which increases the temperature of the circuit elements, reducing their reliability and lifespan. Conventional magnetic disk drives have such drawbacks.

[Means to solve the problem]

A magnetic disk device of the present invention includes a magnetic disk that is a rotating disc-shaped storage medium, a magnetic head that is a transducer that records and reproduces data on the magnetic disk, and a magnetic disk that is a magnetic disk that is a rotating disk-shaped storage medium, a magnetic head that is a transducer that records and reproduces data on the magnetic disk, and In a magnetic disk drive in which a write/read circuit that amplifies signals and sends write data to the magnetic head is housed in a dust-proof sealed structure, power supply and disconnection to the write/read circuit are controlled by the magnetic disk. The starting and stopping of the motor that rotates the motor is synchronized with the starting and stopping of the motor that rotates the motor.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a first embodiment of the present invention.

In the embodiment shown in FIG. 1, the write/read circuit 3 for recording and reproducing data on the magnetic disk 2 by the magnetic head 1 is a circuit that drives the operation of the magnetic head 1.
During a read operation, the reproduced signal is amplified and sent to the subsequent circuit. During a write operation, received write data is converted into a current and supplied to the magnetic head 1. HDA6
is a dust-proof sealed structure that houses a magnetic head 1, a magnetic disk 2, and a write/read circuit 3. The motor 5 is a motor for rotating the magnetic disk 2. The power supply control circuit 4 is a circuit that sends or stops supplying power to the write/read circuit 3 depending on the state of an input signal. The motor drive circuit 8 is a circuit that drives the motor 5.

Next, the operation of the embodiment shown in FIG. 1 will be explained.

When the entire magnetic disk device is powered on, HDA6
Power is supplied to electronic circuits provided outside the circuit, and a DC power supply voltage for the write/read circuit 3 is applied to the signal line 12 in FIG. Further, a power supply voltage for the motor 5 is applied to the signal line 16 . In this state, no voltage is output to the output signal line 14 of the power supply control circuit 4, and no power supply voltage is supplied to the write/read circuit 3. Signal line 1
3 operates the motor drive circuit 8, and when power is supplied to the motor 5 through the signal line 17 and the motor 5 starts rotating, the power supply control circuit 4 is also sent a signal through the signal line 13, so the signal line 14 A power supply voltage is supplied to the write/read circuit 3 through the write/read circuit 3. To stop the motor 5,
This is done by the motor drive circuit 8 stopping power supply to the motor 5 via the signal line 13 . At the same time, the power supply control circuit 4 also connects the write/read circuit 3 via the signal line 13.
Stop supplying power supply voltage to.

FIG. 2 is a block diagram showing a second embodiment of the present invention, and FIG.
This figure is a block diagram showing details of the rotation detection circuit of the embodiment of FIG. 2.

In the embodiment shown in FIG. 2, a magnetic head 1 records and reproduces data on a magnetic disk 2. In the embodiment shown in FIG. The write/read circuit 3 is a circuit that drives the operation of the magnetic head 1 . During a read operation, the reproduced signal of the magnetic head 1 is amplified and sent to a subsequent circuit, and during a write operation, the received write data is converted into a current and supplied to the magnetic head 1. The HDA 6 is a dust-proof sealed structure that houses the magnetic head 1, the magnetic disk 2, and the write/read circuit 3. The motor 5 is a motor for rotating the magnetic disk 2. The power supply control circuit 9 is a circuit that supplies or stops the supply of power to the write/read circuit 3 depending on the state of the rotation detection circuit 7 . The rotation detection circuit 7 detects whether the rotation speed of the motor 5 is equal to or higher than a predetermined rotation speed, and applies a signal corresponding to the result to the power supply control circuit 9 via the signal line 15.

As shown in FIG.
a rectifier circuit 22 that rectifies the output voltage of 1;
2, and a comparison circuit 24 that compares the output voltage of the smoothing circuit 23 with the voltage of the DC power supply 25 and outputs a signal corresponding to the magnitude thereof.

Next, the operation of the embodiment shown in FIG. 2 will be explained.

When the entire magnetic disk device is powered on, HDA6
Power is supplied to electronic circuits provided externally. At this time, a DC power supply voltage for the write/read circuit 3 is applied to the signal line 12 in FIG. When the motor 5 is stopped, there is no output voltage of the generator 21, so the output signal 15 of the comparison circuit 24 indicates that the motor 5 is stopped. Correspondingly, the power supply control circuit 9 Power is not supplied to the write/read circuit 3.

The DC power supply 25 applied to the input of the comparator circuit 24 is connected to the smoothing circuit 2 when the output voltage of the generator 21, which is generated when the rotation speed of the motor 5 is 60 to 80% of the normal rotation speed, is input.
3 is set to a value equal to the output voltage outputted. Therefore, when the motor 5 starts rotating and reaches a steady state, the output signal 15 of the rotation detection circuit 7 indicates that the motor 5 is rotating, and the power supply control circuit 9 applies the power supply voltage to the write/read circuit 3. supply When an abnormality occurs while the motor 5 is rotating and the motor 5 stops, the output signal 15 of the rotation detection circuit 7 indicates that the motor 5 is in a stopped state, so the power supply control circuit 9 sends a signal to the write/read circuit 3. The supply of power supply voltage will be stopped.

〔Effect of the invention〕

As described above, the magnetic disk drive of the present invention is configured to supply or stop power to the write/read circuit based on a start/stop control signal for the motor that rotates the magnetic disk, or to detect the rotational speed of the motor. By configuring the circuit to supply or stop power to the write/read circuit in response to the result, power is not supplied to the write/read circuit when the motor is stopped.
Therefore, it is possible to suppress the temperature rise of the circuit elements of the write/read circuit in a state where there is no wind caused by the rotation of the magnetic disk. Therefore, there is an effect that the reliability and lifespan of the write/read circuit within the HDA can be increased.

23... Smoothing circuit, 24... Comparison circuit, 25... DC power supply.

Claims (1)

[Claims] A magnetic disk which is a rotating disk-shaped storage medium, a magnetic head which is a transducer that records and reproduces data on the magnetic disk, and a signal reproduced by the magnetic head that is amplified and transmitted to the magnetic head. In a magnetic disk drive in which a write/read circuit that sends write data is housed in a dust-proof sealed structure, power supply and disconnection to the write/read circuit are synchronized with starting and stopping of a motor that rotates the magnetic disk. A magnetic disk device characterized by: