JP2940087B2 - Disk storage device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk storage device, and more particularly, to a disk storage device having a function of automatically performing a warm-up operation after starting a motor.

[Conventional technology]

Warm-up operation automatically after the motor is started (until the internal temperature of the disk storage device reaches the steady temperature after the motor reaches the steady-state rotation, or the internal temperature of the disk storage device becomes the normal temperature in the normal case). The conventional disk storage device having a function of performing the idling operation of the motor for a certain period of time when it is expected to arrive) performs the warm-up operation by measuring the actual motor temperature to simplify the control circuit. The warm-up operation for a certain period of time is always performed after the motor is started, without determining whether or not the motor is started.

On the other hand, in recent disk storage devices, the distance between the surface of the disk medium and the head slider has become narrower with the increase in recording density, and therefore, the disk storage device may adhere to the head slider or be removed from the surface of the disk medium. Dust that has entered between the head slider and the head slider has been greatly affecting the write / read characteristics of the disk storage device.

The disk storage device has a function of removing a certain amount of dust by performing a seek operation, but this effect is greatest when the motor is started to perform the seek operation. For this reason, there are cases where the motor is stopped and started for the purpose of removing dust during maintenance work on the disk storage device. However, as described above, because of the function of performing the warm-up operation, the warm-up operation is automatically performed, and the maintenance work must be interrupted until the warm-up operation is completed.

In recent years, computer systems have been operated 24 hours a day, making it difficult to secure time for maintenance and inspection. In such a situation, the waiting time due to the warm-up operation when the motor is stopped and started to improve the reliability is largely wasted.

[Problems to be solved by the invention]

As described above, in the conventional disk storage device having the function of automatically performing the warm-up operation, when the motor for the purpose of removing dust is stopped and started during maintenance work, the warm-up operation is automatically performed. Therefore, the maintenance work must be interrupted until the warm-up operation is completed.

The problem to be solved by the present invention, that is, an object of the present invention is to solve the above-mentioned drawbacks of the conventional disk storage device, and when the warm-up operation has already been completed, the motor is subsequently stopped and started. An object of the present invention is to provide a disk storage device that can improve the efficiency of maintenance work by not performing a warm-up operation when the temperature rises.

[Means for solving the problem]

The disk storage device according to the present invention includes a motor start / stop circuit that outputs a motor start / stop instruction signal to a seek control circuit and a warm-up operation control circuit to be in a state corresponding to the start of the motor or the stop of the motor, respectively. A circuit for inputting the motor start / stop instruction signal and the warm-up operation control signal from the warm-up operation control circuit and the rotation stop signal from the motor control circuit and outputting a motor start / stop signal to the motor control circuit, When the rotation stop signal indicates that the motor is stopped, and the motor start / stop instruction signal instructs start of the motor, the motor start / stop signal is set to a state of instructing start of the motor. The rotation stop signal indicates that the motor is rotating, and the motor start / stop instruction signal is When the motor is instructed to stop, the motor start / stop signal is instructed to stop the motor, the rotation stop signal indicates that the motor is rotating, and the motor start / stop instruction is issued. When the signal instructs the start of the motor, the seek control circuit that sets the motor start / stop signal to instruct the start of the motor after the rotation stop signal indicates that the rotation of the motor has stopped, and A circuit that inputs the motor start / stop signal and the motor rotation signal from the motor, outputs the rotation stop signal to the seek control circuit and the warm-up operation control circuit, and outputs a motor control signal to the motor, The motor control signal is set to a state in which the motor is started when the motor start / stop signal is set to a state instructing start of the motor, When the motor rotation signal indicates that the motor has started to rotate, the rotation stop signal is set to a state indicating the start of the motor, and the motor start / stop signal is set to a state in which the motor is stopped. When the motor control signal is set to a state in which the motor is stopped, and when the motor rotation signal indicates that the rotation of the motor is stopped, the rotation stop signal is set to a state indicating that the motor is stopped. The motor control circuit, a circuit that inputs the motor start / stop instruction signal and the rotation stop signal and outputs the motor start / stop signal to the seek control circuit, wherein the rotation stop signal stops the motor. And when the motor start / stop instruction signal instructs the start of the motor, the warm-up operation control signal indicates the execution of the warm-up operation. State shown,
When the rotation stop signal indicates that the motor is rotating, and when the motor start / stop instruction signal indicates that the motor has stopped, the warm-up operation control signal is set to the warm-up operation. And a warm-up operation control circuit that sets a state in which the execution of is not performed.

〔Example〕

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

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

In FIG. 1, a motor start / stop instruction signal 10 is output from a motor start / stop instruction circuit 1 to a seek control circuit 2 and a warm-up operation control circuit 3. The seek control circuit 2 outputs a motor start / stop signal 11 to the motor control circuit 4 by this. The motor control circuit 4 outputs a motor control signal 14 to the motor 5 and outputs a rotation stop signal 12 to the seek control circuit 2.
And the warm-up operation control circuit 3. The warm-up operation control circuit 3 outputs a warm-up operation instruction signal 13 to the seek control circuit 2. The motor 5 outputs a motor rotation signal 15 to the motor control circuit 4.

FIG. 2 is a circuit diagram showing details of a warm-up operation control circuit of the embodiment of FIG.

As shown in FIG. 2, the warm-up operation control circuit 3 includes a D flip-flop circuit 21. The rotation stop signal 12 is input to the data input terminal (D terminal) of the D flip-flop circuit 21 and is heated from the output terminal (Q terminal) at the rising edge of the motor start / stop instruction signal 10 input to the clock terminal (C terminal). The operation instruction signal 13 is output. The motor start / stop instruction signal 10 has its polarity inverted and is also input to the reset terminal (R terminal), and is reset when it is at a low level (“L”).

Next, the operation of the above-described embodiment will be described with reference to FIGS.

First, the start and stop operations of the motor 5 when performing the warm-up operation will be described with reference to FIG.

As the initial state, the motor start / stop circuit 1
Has been issued, and the rotation of the motor 5 has stopped.

At this time, the motor start / stop instruction signal 10 is low level (“L”), the motor start / stop signal 11 is “L”,
Reference numeral 12 denotes a high level ("H") (a state in which the rotation of the motor 5 is stopped), and the warm-up operation instruction signal 13 is "L".

In this state, when a start instruction of the motor 5 is issued from the motor start / stop circuit 1, the motor start / stop instruction signal 10 becomes "H".
(FIG. 3b). As a result, the motor start / stop signal 11
Becomes "H" (FIG. 3c) and instructs the motor control circuit 4 to start rotation of the motor 5. On the other hand, since the rotation stop signal 12 is "H" (FIG. 3A), the warm-up operation control circuit 3, that is, the D flip-flop circuit 21,
13 is set to "H" (FIG. 3d) to instruct the seek control circuit 2 to perform the warm-up operation. Also, the motor control circuit 4
Outputs a motor control signal 14 so that the motor 5 rotates. (Note that the method of controlling the rotation of the motor 5 is not particularly problematic in the present embodiment. However, it is necessary that the motor 5 output a signal for determining whether the motor is rotating or stopped. Here, it is assumed that the motor rotation signal 15 outputs a pulse signal having the same cycle as the rotation number of the motor, and the motor control circuit 4 rotates the motor according to the cycle of the pulse signal of the motor rotation signal 15. The motor 5 starts rotating, and the motor rotation signal 15 outputs a pulse signal having the same cycle as the number of rotations of the motor 5. When the pulse signal of the motor rotation signal 15 starts to change from “H” to “L” or from “L” to “H”, the motor control circuit 4 determines that the motor 5 is rotating and stops rotation. The signal 12 is set to "L" (FIG. 3e).

Further, since the warm-up operation instruction signal 13 is “H”, the seek control circuit 2 performs the warm-up operation.

Subsequently, when an instruction to stop the motor 5 is issued from the motor start / stop circuit 1, the motor start / stop instruction signal 10 becomes "L" (FIG. 3f). As a result, the motor start / stop signal 11 becomes "L" (FIG. 3g), and instructs the motor control circuit 4 to stop the motor 5. On the other hand, the warm-up operation control circuit 3
Sets the warm-up operation instruction signal 13 to "L" (FIG. 3h). Further, the motor control circuit 4 outputs a motor control signal 14 so that the motor 5 stops. As a result, the rotation of the motor 5 is stopped, and the motor rotation signal 15 also remains at "H" or "L" without any change in the pulse signal. The motor control circuit 4 determines that the motor 5 has stopped when the motor rotation signal 15 stops changing, and outputs a rotation stop signal.
12 is set to “H” (FIG. 3i).

Next, the operation when the warm-up operation is not performed will be described with reference to FIG.

In this case, it is assumed that an instruction to start the motor 5 is issued from the motor start / stop circuit 1 and the motor 5 is rotating.

In this state, when a stop instruction of the motor 5 is issued from the motor start / stop circuit 1, the motor start / stop instruction signal 10 becomes "L".
(FIG. 4k). As a result, the motor start / stop signal 11
Becomes "L" (FIG. 4, l), and instructs the motor control circuit 4 to stop the motor 5. On the other hand, the warm-up operation control circuit 3
Sets the warm-up operation instruction signal 13 to "L" (FIG. 4m). Further, the motor control circuit 4 outputs a motor control signal 14 so that the motor 5 stops. This causes the motor 5 to stop rotating, but the motor 5 does not stop immediately due to the inertia of the rotating part, and the motor rotation signal 15 also has a gradually changing cycle, and finally the motor 5 When the rotation of is stopped, the state remains at “L” or “H”. It takes several tens of seconds during this time. Therefore, the rotation stop signal 12 output from the motor control circuit 4 is in the state of "L" (FIG. 4n) for a while. When the start instruction of the motor 5 is issued again during this time, the motor start / stop instruction signal 10 becomes "H" (FIG. 4o). At this time, since the rotation stop signal 12 is “L”, the seek control circuit 2 determines that the rotation of the motor 5 has not stopped yet, and even if the motor start / stop instruction signal 10 becomes “H”, The motor start / stop signal 11 is not set to “H”, but after the rotation of the motor 5 is stopped, that is, the rotation stop signal 12
(P), the motor start / stop signal 11 is set to "H" (fourth
Figure q).

On the other hand, the warm-up operation control circuit 3 determines that the motor start / stop instruction signal 10 has become “H” (FIG. 4 o), but the rotation stop signal 12 is “L” (FIG. 4 n). The instruction signal 13 is not set to "H", but remains at "L" (FIG. 4r).

When the motor start / stop signal 11 becomes “H” (q in FIG. 4), the motor control circuit 4 outputs a motor control signal 14 so that the motor 5 rotates, and the motor 5 starts rotating. When the motor 5 starts rotating, the motor rotation signal 15 starts to change.
Is "L" (FIG. 4s). Then, the seek control circuit 2
Does not perform the warm-up operation because the warm-up operation instruction signal 13 remains at "L".

〔The invention's effect〕

As explained above, the disk storage device of the present invention
When the motor is restarted within the time (usually several tens of seconds) from when the motor stop command is issued until the rotation of the motor stops,
There is an effect that it is possible to prevent the warm-up operation from being performed, and thus it is possible to shorten the waiting time during the maintenance work and improve the efficiency of the maintenance work.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention, FIG. 2 is a circuit diagram showing details of a warm-up operation control circuit of the embodiment of FIG. 1, and FIG. FIG. 4 is a waveform diagram showing the waveform of each signal of the embodiment of FIG. 1, and FIG. 4 is a waveform diagram showing the waveform of each signal of the embodiment of FIG. 1 when the warm-up operation is not performed. 1 ... motor start / stop instruction circuit, 2 ... seek control circuit, 3 ... warm-up operation control circuit, 4 ... motor control circuit,
5 ... motor, 10 ... motor start / stop instruction signal, 11 ...
Motor start / stop signal, 12 rotation stop signal, 13 warm-up operation instruction signal, 14 motor control signal, 15 motor rotation signal, 21 D flip-flop circuit.

Claims (2)

(57) [Claims] 1. A motor start / stop circuit for outputting a motor start / stop instruction signal to a seek control circuit and a warm-up operation control circuit to enter a corresponding state for starting a motor or stopping the motor, respectively, A circuit for inputting a start / stop instruction signal, a warm-up operation control signal from the warm-up operation control circuit, and a rotation stop signal from the motor control circuit, and outputting a motor start / stop signal to the motor control circuit; Indicates that the motor is stopped, and when the motor start / stop instruction signal instructs the start of the motor, the motor start / stop signal is set to a state of instructing the start of the motor, and the rotation The stop signal indicates that the motor is rotating, and the motor start / stop instruction signal causes the motor to stop. When instructed, the motor start / stop signal is set to a state in which the motor is instructed to stop, the rotation stop signal indicates that the motor is rotating, and the motor start / stop instruction signal indicates that the motor is stopped. When the start is instructed, the seek control circuit that sets the motor start / stop signal to instruct the start of the motor after the rotation stop signal indicates that the rotation of the motor has stopped, and the motor start / stop. A circuit for inputting a signal and a motor rotation signal from the motor, outputting the rotation stop signal to the seek control circuit and the warm-up operation control circuit, and outputting a motor control signal to the motor, wherein the motor start / stop signal The motor control signal is set to a state in which the motor is started when the state instructs start of the motor, and the motor rotation When the signal indicates that the motor has started to rotate, the rotation stop signal is set to a state indicating the start of the motor, and when the motor start / stop signal indicates a state to stop the motor, the motor is stopped. A motor control circuit that sets a control signal to a state in which the motor is stopped, and sets the rotation stop signal to a state in which the motor is stopped when the motor rotation signal indicates that the rotation of the motor is stopped. A circuit that inputs the motor start / stop instruction signal and the rotation stop signal and outputs the motor start / stop signal to the seek control circuit, wherein the rotation stop signal indicates that the motor is stopped. And when the motor start / stop instruction signal instructs start of the motor, the warm-up operation control signal is in a state of instructing execution of warm-up operation, When the rotation stop signal indicates that the motor is rotating, and when the motor start / stop instruction signal indicates that the motor has stopped, the warm-up operation control signal is set to the warm-up operation. And a warm-up operation control circuit that sets a state in which the execution is not performed. 2. The disk storage device according to claim 1, wherein a D flip-flop circuit is used as said warm-up operation control circuit.