JPH087459A - Disk device - Google Patents

Abstract

PURPOSE:To realize high speed processing by simplifying the constitution of circuits related to the measurement of revolving speed and decision whether it is the specified revolving speed or not in a disk device having plural rotating and driving parts for recording and reproducing information by rotating and driving a disk-like recording medium at the specified revolving speed. CONSTITUTION:By driving a motor 8, the spindles 3 and 4 of drives A and B are mutually interlocked and rotated through pulleys 5 and 6 and a belt 7, so that disks 1 and 2 are driven and rotated. A pulse is generated by an index detector 9 every time the disk 1 is rotated once, and pulse interval time corresponding to the revolving speed of the disk 1 is measured by a measurement circuit 10. Whether the revolving speed of the disk corresponding to the measured pulse interval time is the specified revolving speed or not is decided by a decision circuit 11. In the case the decision circuit 11 decides that it is the specified rovolving speed, it outputs a ready signal showing that the revolving speed of the disk is the specified one for both of the spindles 3 and 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disc device for recording or reproducing information by rotationally driving a disc-shaped recording medium at a predetermined number of revolutions.

[0002]

2. Description of the Related Art As a disk device of this type, a floppy disk device and a hard disk device which have been conventionally used as an external storage device of a computer or the like are known. In this type of device, a disk as a recording medium is generally driven to rotate at a prescribed number of rotations to write and read data. Therefore, it is necessary to measure whether or not the number of revolutions of the disc is a specified value in order to perform reliable recording and reproduction.

Therefore, the interval time of the index pulse, which is output one pulse for each rotation by the rotation of the disk, is measured through an index hole formed on the disk or an index magnet attached to a spindle for chunking the medium. The method described above is used to measure the number of revolutions of the disk to determine whether the number of revolutions is a specified value.

In addition, a disk drive unit for a disk device,
When a plurality of so-called drives are provided, the above-described disk rotation speed measurement and determination as to whether the drive speed is the specified rotation speed or not are performed for each drive.

[0005]

However, in the configuration for measuring the disk rotational speed and determining whether the rotational speed is the specified rotational speed for each of the plurality of drives as described above, an electric circuit for the measurement and the determination is provided. This requires a plurality of drives corresponding to the number of drives, complicates the configuration of the entire electric circuit, and is expensive. Further, if the above-mentioned measurement and determination are performed for each of a plurality of drives, there is a problem that the processing takes time and the processing becomes slower accordingly.

Therefore, the present invention solves the above problems in a disk device having a plurality of drives and simplifies the configuration of the circuit relating to the measurement and determination of the above-mentioned number of revolutions. An object of the present invention is to provide a disk device that can measure and determine the number of revolutions without any trouble even when a medium is mounted only in the drive and can speed up the process.

[0007]

For this reason, the disk device according to the present invention rotates in association with each other by the drive of a single drive motor, and rotates a plurality of disk-shaped recording media respectively mounted therein. A rotation driving unit, a measuring unit that measures the number of rotations at which one of the plurality of rotation driving units drives the disk-shaped recording medium to rotate, and a rotation number measured by the measuring unit is a predetermined rotation. The number of revolutions of the disc-shaped recording medium is determined by generating a signal indicating that the number of revolutions of the disc-shaped recording medium is a predetermined number of revolutions. In a disk device for reproducing, the plurality of rotation driving units are rotated by a rotation driving unit A configured to detect the number of rotations from a member mounted on the driving unit and an index hole formed in the disc-shaped recording medium. When the determination means first determines that the rotation speed of the rotation drive portion A is a predetermined rotation speed, the disc-shaped recording medium of the rotation drive portion A has a predetermined rotation speed. It is characterized by transmitting a signal indicating that there is, and then confirming the rotation of the rotation drive section B and transmitting a signal indicating that the disk-shaped recording medium of the rotation drive section B has a predetermined rotation speed. Depending on the configuration
It is intended to achieve the above purpose.

[0008]

With the above structure, the number of rotations of one of the plurality of rotation driving units for driving the disk-shaped recording medium to rotate is measured, and it is determined whether or not the number of rotations is the predetermined number of rotations. When it is determined that the rotation speed is the predetermined rotation speed, it can be confirmed that the rotation speed of the drive device for the disk-shaped recording medium is the predetermined rotation speed for all of the plurality of rotation driving units, and the rotation speed of the disk-shaped recording medium of one rotation driving unit is The results of measurement and determination of the rotation speed are applied to other rotation drive units. Then, it is possible to display an appropriate drive of the disc having the index holes.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. Here, a floppy disk device is exemplified.

FIG. 1 shows the construction of the essential parts of a floppy disk drive according to an embodiment of the present invention, and shows the construction relating to the measurement of the disk rotation speed and the judgment of whether or not it is a specified rotation speed.

The floppy disk device of this embodiment is A,
Two drives B are provided, and each has two spindles 3 and 4 on which the two floppy disks 1 and 2 are mounted and rotated. The spindle 4 of the drive B is directly connected to the drive shaft of the motor 8 and is rotationally driven by the motor 8. The spindle 3 of the drive A includes a pulley 5 fixed to the spindle 3 and a pulley 6 fixed to the spindle 4.
Is driven to rotate by driving a motor 8 via a belt 7 stretched between the pulleys 5 and 6. That is, the spindles 3 and 4 are rotationally driven in conjunction with each other.

In the vicinity of the spindle 3 of the drive A, a magnet sensor for detecting an index magnet (not shown) attached to the spindle to generate one pulse (hereinafter referred to as an index pulse) for each rotation of the disk 1. Is provided with an index detector 9.

The index pulse generated by the index detector 9 is input to the index measuring circuit 10. This index pulse time interval corresponds to the rotation speed of the disk 1, in other words, this pulse signal is a rotation speed signal indicating the rotation speed of the disk 1. That is, the rotation speed of the disk 1 can be detected by using this signal.

Therefore, the index measuring circuit 10 measures the index pulse time interval by counting the clock signal, compares the index pulse time interval with a predetermined range value obtained when the number of rotations is a prescribed value, and is within a predetermined range. Whether or not the rotation speed of the disk 1 is the specified rotation speed can be determined depending on whether or not. Further, since the disc 1 and the disc 2 are rotated in association with each other by the belt 7, the determination result of the disc 1 can be used as the determination result of the disc 2.

The determination result obtained by the index measuring circuit 10 is input to the drive ready determining circuit 11. This circuit, this judgment result and media-in signal,
The logical product of the motor-on signal and the like is calculated, and drive A is in the ready state (the number of revolutions of the disk is the prescribed number of revolutions)
And a drive B ready signal indicating that drive B is in a ready state.

Further, according to the method of measuring the index by the means for directly detecting the rotation of the spindle as described above, the index pulse can be detected even when the disk 1 on the rotation speed detecting side is not mounted in this system. Therefore, regardless of the presence or absence of the disk 1 in drive A,
The signal required for drive B is obtained.

However, even if the drive B has a protective medium such as 5.25 "FDD for detecting an index using the index hole of the disk, the index pulse is not detected from the disk 2. Regardless, there is a problem that the drive B becomes ready.Therefore, in this case, the index signal of the disk 2 is also ready so that it becomes ready only when the index is detected from the disk 2.
1, and the drive B ready signal is gated depending on the presence or absence of this signal.

Although the index measurement circuit 10 and the drive ready determination circuit 11 are shown as separate circuits in the above description of the configuration, they can actually be configured by one microcomputer.

Next, the processing operation relating to the measurement and determination of the disk rotation speed with the above configuration will be described with reference to the flowchart of FIG.

When the disk device is powered on, the motor 8
Is started, the spindles 3 and 4 are driven to rotate, and the disks 1 and 2 are mounted on them, respectively, and the index detector 9 generates one index pulse per rotation in accordance with the rotation of the disk 1.

The index pulse is input to the index measuring circuit 10, which measures the index pulse interval time corresponding to the rotation speed of the disk 1 as described above. That is, the rotation speed of the disk 1 is measured (step S1 in FIG. 2), and it is determined whether the rotation speed is the specified rotation speed or not (step S2). If the result is not the specified rotation speed, the determination is continued and the result is output to the drive ready determination circuit 11.

In response to this, the drive ready determination circuit 11
When receiving a signal that the disk 1 has the specified rotation speed, the drive A ready signal is generated in consideration of the media-in signal and the motor-on signal (step S3). When the drive B is an FD having an index hole (step S4, YES), when the index is detected from the disk 2 (step S5), the drive B ready signal is output (step S6). However, drive B
If is not the method of detecting the index from the disk 2 (step S4, NO), the index detection of the drive B (step S5) is not performed and the drive B ready signal is output (step S6).

As described above, according to the present embodiment, the motor 8 of one drive source drives the spindles 3 and 4 of the two drives A and B, so that the mechanical structure is simplified. Further, since a circuit for measuring and determining the disk rotation speed is provided only for one drive A and the results of the measurement and determination are applied to the other drive B, the circuit configuration relating to the above measurement and determination is It will be halved and it will be significantly easier.
Therefore, the cost of the device can be greatly reduced.

Further, since the disk rotation speed is measured and determined only for drive A, the measurement and determination results are also applied to drive B, and the rotation speed is not measured and determined for drive B. It didn't take long
Processing can be done at high speed. Since the spindles 3 and 4 of the drives A and B are interlocked and rotate at the same number of revolutions, there is no problem even if the result of measurement and determination of the number of revolutions of the drive A is applied to the drive B.

Further, a disc having index holes such as 5.25 "FDD can be appropriately dealt with.

(Other Embodiments) In the above embodiment, the number of drives is two. However, the number of drives is three or more, and three or more spindles are rotationally driven in association with each other by one motor. As a matter of course, the same configuration as described above can be applied to the measurement and determination of the disk rotation speed.

The mechanism for rotating the spindles of a plurality of drives in conjunction with each other is not limited to the mechanism using pulleys and belts, but may be a mechanism using gears. Also,
In the case of two drives, even if the drive shaft of the motor 8 for rotationally driving the spindle is projected to the lower side in the drawing and the spindles 3 and 4 are directly connected above and below the drive shaft in FIG. Good.

If the spindles of a plurality of drives rotate in conjunction with each other, it is possible to configure them at a predetermined rotation speed ratio even if their rotation speeds are not the same.

If the drive A is of a type that can detect the index from the spindle as described above, the method of detecting the index of the drive B can be from the spindle or the disk.

[0030]

As is apparent from the above description, according to the present invention, in a disc device for recording or reproducing information by rotationally driving a disc-shaped recording medium at a predetermined number of revolutions, one drive motor is used. A plurality of rotation driving units that rotate in association with each other by driving to rotate the respective disk-shaped recording media mounted therein, and a disk-shaped recording medium of one rotation driving unit of the plurality of rotation driving units. Measuring means for measuring the number of rotations to be rotationally driven, and whether or not the number of rotations measured by the measuring means is the predetermined number of rotations, and when it is determined to be the predetermined number of rotations, the plurality of rotation drive units And a determination means for generating a signal indicating that the number of revolutions of the disc-shaped recording medium is the predetermined number of revolutions. Since the result of the determination as to whether or not the rotation speed is the predetermined rotation speed is applied to other rotation drive units as well, the mechanical configuration is simplified, and the circuit configuration related to the measurement and determination of the rotation speed is also simplified. It is excellent in that the cost can be reduced, and even if the result of the measurement and determination of the number of rotations of one rotation drive unit is applied to other rotation drive units, there is no problem and the processing speed can be increased. The effect is obtained. Furthermore, it is possible to properly deal with a disc having index holes.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a main part of a floppy disk device which is an embodiment of the present invention.

FIG. 2 is a flowchart showing a process of measuring a disc rotation speed and determining a prescribed rotation speed according to an embodiment.

[Explanation of symbols]

 1, 2 Floppy disk 3,4 Spindle 5,6 Pulley 7 Belt 8 Motor 9 Index detector 10 Index measurement circuit 11 Drive ready determination circuit

Claims (1)

[Claims] 1. A plurality of rotation drive units that rotate in association with each other by the drive of one drive motor to drive the respective disk-shaped recording media mounted therein, and one of the plurality of rotation drive units. Measuring means for measuring the number of rotations by which each of the rotation driving parts rotationally drives the disc-shaped recording medium, and whether the number of rotations measured by the measuring means is a predetermined number of revolutions or not is determined to determine the number of revolutions of the disc-shaped recording medium A disc device that has a determination unit that generates a signal that indicates the number of revolutions, and that rotationally drives a disc-shaped recording medium at a predetermined number of revolutions to record or reproduce information. Is a rotary drive unit A configured to detect the number of rotations from a member mounted on the drive unit, and a rotary drive unit B for confirming the rotation by an index hole formed in the disk-shaped recording medium. When it is determined that the rotation speed of the rotation drive unit A is a predetermined rotation speed, a signal indicating that the disk-shaped recording medium of the rotation drive unit A has a predetermined rotation speed is transmitted, and then the rotation drive unit B is transmitted. Disc drive, and outputs a signal indicating that the disc-shaped recording medium of the rotation drive unit B has a predetermined number of revolutions.