JPS6240659A - Disk device - Google Patents

Abstract

PURPOSE:To shorten the waiting time of the access without stopping wastefully the stationary rotation of the disk by interrupting the internal control electric power source with the detaching from the stationary scope of the rotation of the disk as conditions. CONSTITUTION:A control circuit 7, which a control circuit 5 composed of a microcomputer and a memory has, is connected to a sensor circuit 8. The detecting signal of the index hole detected by a sensor 12 is sent through the sensor circuit 6 to a sensor control circuit 7 and further, by supervising the pulse width of the detecting signal, a ready signal generating circuit 8 detects the stationary rotation of a disk 13. Namely, the ready signal generating circuit 8, when the rotation of the disk 13 arrives at the stationary condition, outputs the internal ready signal through a signal line 8A and when the disk gets out of the stationary condition, the ready signal is de-energized. Thus, the control circuit 5 instructs the ON and OFF of the control electric power source to an electric power source control circuit 4. For such a reason, the access time can be shortened without stopping the stationary circuit of the disk wastefully.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk device, and particularly to a disk device that performs recording and reproduction on a disk-shaped recording medium of various types such as a magnetic method and an optical method.

[Prior Art] In this type of device, for example, a magnetic disk device, at least part or all of the power supply circuit is cut off during a period when a motor ON signal from an external device is not supplied, and when the motor ON signal is supplied, the power supply circuit is closed. Disk drives have been proposed in which a portion of the disk drive is turned on. Furthermore, a method has also been proposed in which the motor ON signal is replaced with a drive select signal.

[Problem to be Solved by the Invention 1] As mentioned above, in the conventional proposal, the power supply is controlled unconditionally by an external motor ON or drive select signal, and the driving state of the disk is not taken into account. Therefore, this is inconvenient in devices such as floppy disk devices in which the medium cannot be accessed unless the rotational speed of the recording medium is accurately controlled. For example, if the motor ON (drive select) signal is turned on and off within a short period of time, not only will the motor be turned off each time, but the control power will also be cut off, so it will be wasted to shift the disk to steady rotation. Sometimes waiting time was required.

[Means for Solving the Problems] In order to solve the above problems, in the present invention, the power supply control signal is turned on at the disk drive start signal, and turned off when the rotational state of the disk deviates from the normal range. A configuration was adopted in which the power supply control signal is used to control the on/off of a predetermined power supply.

[Function] With the above configuration, power-off is controlled by detecting the rotation of the disk drive motor, rather than performing power-saving control using external signals. Since the power does not need to be turned off every time the disk is turned on and off in short cycles or due to malfunctions such as noise, access wait times can be shortened without needlessly stopping the steady rotation of the disk. .

[Example] The present invention will be described in detail below based on an example shown in one drawing. However, below, the structure of a floppy disk drive will be illustrated as an example of a disk device.

FIG. 1 is a block diagram showing the configuration of a disk drive, and in the figure, reference numeral l indicates an external host system such as a computer system. The host system 1 controls the power supply of the disk drive 2 via a plurality of signal lines 17, and the input/output of recording/reproducing signals is carried out via a plurality of signal lines 20.
It is done through. Input/output of these signals is performed via a known interface circuit 3.

The signal [17 is connected inside the disk drive 2 to a control circuit 5 that controls the operation of the drive, and a power supply control circuit 4 composed of gates, switching transistors, and the like. The power supply control circuit 4 turns on/off power supplied via a signal line 22 to the recording/reproducing circuit 9, the sensor circuit 6, the motor control circuit 10 for driving disk rotation, and the control circuit 11 for the step motor for moving the magnetic head. Control off.

The floppy disk 13 is driven by a motor 15 at a predetermined rotation speed. A magnetic helad 14 for recording and reproducing is moved in the diametrical direction of the disk 13 by a step motor 16 via a known drive mechanism such as a screw or a steel belt, and recording and reproducing are performed on a desired track on the disk. . Recording/reproducing signals are input/output to/from the recording/reproducing circuit 9. Further, reference numeral 12 denotes a sensor composed of a photocoupler or the like, and this sensor detects an index hole of the disk 13 and detects the rotational state of the disk. The detection signal is input to the sensor circuit 6.

A control circuit 5 composed of a microcomputer, a memory, etc. has a sensor management circuit 7 therein, and this management circuit 7 is connected to the sensor circuit 6 described above. The index hole detection signal detected by the sensor 12 is sent to the sensor management circuit 7 via the sensor circuit 6, and by monitoring the pulse width of this detection signal, the ready signal generation circuit 8 detects steady rotation of the disk. do. That is, the ready signal generation circuit 8
When the rotation reaches a steady state, an internal ready signal is output via the signal line 8A. Further, when the disk rotation leaves the steady state, the ready signal is deactivated.

A ready signal on the signal line 8A and a select signal 19 input from the host system 1 via the signal line 19, which is a part of the signal line 20, are input to the AND gate 30. The logical sum formed by this AND gate is sent to the host system via the data bus of signal @20.

Movement of the magnetic head 14 to a desired track is performed by the control circuit 5 controlling the step motor 16 via the step motor control circuit 11 ′.Input/output signals from the magnetic head 14 are transferred via the recording/reproducing circuit 9. After processing such as input/output switching and amplification, the signal line 20
is sent to the internal data bus.

Next, the operation of the above configuration will be explained.

FIG. 2 shows, from the top, the state of the main power supply, the control power supply signal M22, the rotation control signal of the motor 15 for driving the disk rotation output from the control circuit 5, the ready signal of the signal line 8A, and the power supply signal of the signal line 21. It is a timing chart figure which shows each.

In order to perform recording and playback while the L power is turned on, the control circuit 5 connects the signal line 22 via the signal line 21 in response to the motor ON signal or drive select signal from the host system L, as well as the disc cassette detection signal. Power on the control power supply of signal line 1.
When the rotation control signal is turned on via 8, the motor control circuit IO starts the motor 15. This will cause disk 1
3 rotates and the sensor 12 detects the index hole,
This index signal is input to the sensor management circuit 7 via the sensor circuit 6. When the rotation of the motor 15 falls within a certain rotation speed range, the ready signal generation circuit 8 connects the signal line 8A.
Generates a ready signal via.

The AND gate 30 outputs the AND of this ready signal and the select (or motor ON, etc.) signal on the signal line 19. When the drive is in the selected state, the AND gate 30 outputs an active signal (high level in this case), which enables the magnetic heald 14 to perform recording and reproduction.

Recording and reproduction are performed using a step motor 16 and a magnetic helad 14.
is moved to a desired track, and recording/reproduction is performed by the same process as that known in the art.

After the desired access has been made, the control circuit 5 turns off the rotation control signal on the signal line 18 to save power at timing to in FIG. When turned off), the motor control circuit 10 stops the motor 15.

The pulse width of the index signal detected by the sensor 12 deviates from the steady state, and the ready signal generation circuit 8 sets the ready signal to a low level. As a result, the output of the OR gate 30 becomes a low level inactive state, and this signal is input to the control circuit 5. As a result, the control circuit 5 sets the power supply signal on the signal line 21 to a low level, and controls the power supply control circuit 4. Instructs to turn off the power. As a result, the control power supply for the signal line 22 is cut off.

According to the above embodiment, when performing power saving control, the control power supply is cut off when the rotational state of the disk deviates from the normal range, rather than unconditional cutoff control using an external signal. Even if the motor control signal is turned on and off periodically, the control power will not be cut off unless the disk rotation deviates from the normal range, so the control system should be operated as much as possible while the disk is rotating normally. can be maintained. For example, timing 10 in Figure 2
The motor is turned off at
Even if the motor ON signal or select signal is input between t2, or if the motor is turned off by mistake due to noise, etc., the control power is alive between t1 and t2, so disk access can be performed quickly. access, and the access waiting time will not be unnecessarily extended.

In the above embodiments, a floppy disk drive was used as an example, but the power control technique described above can be applied to various disk devices regardless of the recording/reproducing method, such as magnetic or optical.

[Effects] As is clear from the above explanation, according to the present invention, the internal control power supply is cut off on the condition that the disk rotation leaves the normal range, so that the motor is turned off or the selection is turned off. Therefore, it is possible to provide an excellent disk device that can perform high-speed processing without shutting off the control power even in the event of a failure.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a floppy disk drive as an example of a disk device according to the present invention, and FIG. 2 is a timing chart showing the operation of the configuration of FIG. 1. l...Host system 2...Disk drive 4
...Power supply 5...Control circuit 6.
...Control circuit 12...Sensor 13...Disk 14...Magnetic head 15...Motor
16... Step motor 30... ORGATE patent applicant Canon Electronics Co., Ltd. g Q 1) 22 - to 10 ON νν9ν police

Claims (1)

[Claims] In a disk device that rotationally drives a disk-shaped recording medium and performs recording and reproduction on the recording medium, a means for detecting the rotational state of the disk is provided, and when the detected rotational state deviates from a normal range, the device is controlled. A disk device characterized by shutting off power.