JPH03224174A - Disk driving device - Google Patents

Abstract

PURPOSE:To surely chuck a disk in the stage of a low rotational frequency by driving a disk driving motor at the time of chucking to stepwise increase the rotational frequency to a steady rotational frequency. CONSTITUTION:A disk driving motor 3 is driving and controlled through a motor driver 2 consisting of an IC or the like by an FDC (floppy disk drive controller) 1. When the disk is loaded onto a spindle hub, the FDC 1 sets a motor-on signal 11 to the low level for activation to start the disk driving motor 3 and indicates the rotational frequency of this motor 3 to a low value by a rotational frequency switching signal 12. After a prescribed time, the rotational frequency is indicated to a high value by the rotational frequency switching signal 12 to stepwise increase the rotational frequency of the motor to the steady rotational frequency. Thus, the disk is surely shucked in the stage of the low rotational frequency of the disk driving motor 3 at the time of chucking.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention involves chucking a disk as a recording medium onto a disk drive motor, and rotating the disk by the drive of the motor to record or reproduce information. The present invention relates to a disk drive device.

[Prior art] A 3.5-inch FDD is used as this type of disk drive device.
Figure 7 shows the structure and chucking operation of the main parts of the disk chucking mechanism (floppy disk drive device).
This will be explained with reference to A) to (C) and FIG.

In these figures, reference numeral 4 denotes a spindle shaft which is a rotating shaft of a disk drive motor (not shown), and a disc-shaped spindle hub 5 is fixed to the tip thereof. A magnet 6 is fixed to the upper surface of the spindle hub 5. Further, a drive pin 7 is attached to the spindle hub 5 so as to be movable up and down through the hub 5, and is urged upward by a biasing means such as a spring (not shown).

Further, reference numeral 9 is a disk serving as a magnetic recording medium, and a circular center hub 8 made of an iron plate or the like is fixed to the center of the disk. A center hole 8a is formed in the center of the center hub 8, and a chucking hole 8b is formed near the outer periphery.

During chucking, the disk 9 is loaded onto the spindle hub 5 by a disk loading mechanism (not shown),
As shown in FIG. 7(A), the center hub 8 is placed on the spindle hub 5 so that the spindle shaft 4 fits into the center hole 8a, and is attracted onto the spindle hub 5 by the magnetic force of the magnet 6.

Then, a disk drive motor (not shown) is started, and the drive bin 7 is rotated clockwise as shown by the arrow in FIG. 7(A) due to its rotational drive, and is driven as shown in FIG. 7(B). The bottle 7 enters into the chucking hole 8b. Then, the drive pin 7 further rotates and engages with the outer corner of the chucking hole 8b and presses it outward as shown in FIG. The chucking is completed in which the rotational driving force of the disk drive motor is transmitted to the disk 9 by the drive bin 7. Note that FIG. 8 corresponds to FIG. 7 ( ) and shows a state in which chucking is completed.

By the way, FIG. 6 is a timing chart showing how the disk drive motor is activated during chucking in a conventional FDD that performs chucking as described above. It shows the active motor-on signal and the rotational speed (rotational speed) of the disk drive motor over time. As shown in Figure 6, in the past, no special rotational speed control was performed when starting the motor for chucking, and the disk drive motor was simply turned on by the motor-on signal, and the rotational speed of the disk drive motor was started. At times, the rotation speed suddenly rises linearly from 0 to the steady rotation speed.

[Problems to be Solved by the Invention] However, in the conventional method of controlling the startup of the disk drive motor during chucking as described above, the rotation speed rapidly rises to the steady rotation speed immediately upon startup, so it is difficult to control the startup of the disk drive motor during chucking. In the device, the operation of the chucking mechanism cannot keep up with the rotational speed, and the drive bin 7 is
There has been a problem in that there is a high rate of occurrence of defective chucking in which the chucking does not engage properly with the center hub 8 of the holder.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned conventional drawbacks in this type of disk drive device and to enable reliable chucking.

[Means for Solving the Problems] In order to solve the above problems, according to the present invention, a disk as a recording medium is chucked onto a disk drive motor, and the disk is rotated by the drive of the motor to record information. Alternatively, in a disk drive device that performs playback, a configuration is adopted in which a control means is provided for starting the motor at the time of the chucking and increasing the number of revolutions of the motor stepwise up to a steady number of revolutions at the time of starting.

[Function] According to such a configuration, the disk drive motor is started at the time of chucking, and its rotational speed is gradually increased to a steady rotational speed, so that chucking is reliably performed at a low rotational speed. .

[Example] Hereinafter, details of embodiments of the present invention will be described with reference to the drawings.

First Embodiment FIG. 1 schematically shows the configuration of a control system related to control of a disk drive motor of an FDD according to a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an FDC (floppy disk drive controller) comprised of a dedicated LSI that controls the entire FDD.

Further, reference numeral 3 denotes a disk drive motor consisting of a DC brushless morph or the like that rotationally drives the disk.

Drive control of the disk drive motor 3 is performed by the FDCI via a motor driver 2 composed of an IC or the like. That is, the FDCI instructs the motor driver 2 to turn the disk drive motor 3 on or off using a low-level active motor-on signal 11. Here, the motor driver 2 is assumed to be able to switch the rotation speed of the disk drive motor 3 into two stages: high speed (steady rotation speed) and low speed, and the FDCI controls the rotation of the motor 3 by the rotation speed switching signal 12 to the motor driver 2. The number shall be indicated as high speed (high) or low speed (low).

The chucking mechanism of the FDD in this example is shown in Figure 7 (A
) to (C) and as described above in FIG.

With the above-described configuration, the FDC 1 controls the activation of the disk drive motor 3 during chucking according to the procedure shown in FIG. 2 as follows.

That is, when the disk 9 is loaded onto the spindle hub 5 as shown in FIG. 7(A) described above, the FDCI starts the process shown in FIG.
is set to an active low level to start the disk drive motor 3, and the rotation speed switching signal 12 instructs the rotation speed of the motor 3 to be low.

Next, a loop of step S2 waits for a predetermined time t to elapse, and when the time t has elapsed, the rotation speed is instructed to be high by the rotation speed switching signal 12 in step s3, and then a standby state is entered to wait for a command from the host system.

The motor on signal 11, the rotation speed switching signal 12, and the changes over time in the rotation speed of the motor 3 due to the above-mentioned control are expressed as a third signal.
This is shown in the timing chart diagram in the figure. As shown in the figure, at time T0, the motor on signal 11 becomes low level and the motor 3 is started, and before the above-mentioned predetermined time t has elapsed, the rotation speed reaches a predetermined low speed and the motor 3 is activated. The low speed is maintained until TI, and at time T1, the rotational speed switching signal 12 changes from low level to high level to increase the rotational speed, and after a short period of time, the steady rotational speed is reached.

As described above, in this embodiment, the rotational speed of the disk drive motor 3 is increased stepwise from low speed to high speed (steady rotational speed) when the chucking motor is started, so that the drive bin 7 is moved to the center hub 8 during the low speed period. can be reliably engaged and chucking can be performed reliably. In other words, by appropriately setting the above-mentioned low rotational speed and the period during which the low speed is maintained according to the operating characteristics of the chucking mechanism, chucking can be ensured and the reliability of the device can be improved. can.

Second Embodiment Next, the timing chart in FIG. 4 shows the state of motor starting control during chucking of an FDD according to a second embodiment of the present invention.

In this embodiment, upon startup, the motor-on signal 11 is first set to low level at time T0, immediately returned to high level, and then set to low level again at time T after a predetermined period of time has elapsed. That is, one pulse of a predetermined width is added to the conventional method of changing the motor-on signal. Even in this case, the rotational speed increases stepwise from low speed to high speed as shown in the figure, and chucking can be performed reliably as in the first embodiment. In this case, the low speed rotation speed and its period can be set as desired by the width, interval, number, etc. of the above-mentioned pulses.

Third Embodiment Next, FIG. 5 shows the startup control according to the third embodiment.

As shown in the figure, in this embodiment, the drive voltage of the disk drive motor 3 is changed in stages. That is, motor on signal 1
The drive voltage is kept at a predetermined low voltage from time T0 at the time of startup when the signal 1 becomes low level until time T, at which a predetermined period of time has elapsed, and at time T1, the drive voltage is increased to a steady drive voltage. Even in this case, the rotational speed of the motor 3 similarly increases stepwise, and the same effects as in the first and second embodiments can be obtained.

In addition to the method described above, the number of revolutions may be changed in steps by changing the oscillation frequency of the drive signal for switching the excitation phase of the motor coil in steps.

[Effects of the Invention] As is clear from the above description, according to the present invention, a disk as a recording medium is chucked onto a disk drive motor, and the disk is rotated by the drive of the motor to record or reproduce information. In a disk drive device that performs
Since the configuration includes a control means that starts the motor at the time of the chucking and increases the rotational speed of the motor stepwise to a steady rotational speed at the time of the startup, the rotational speed of the disk drive motor is low during the chucking. This provides an excellent effect in that chucking can be performed reliably in stages and the reliability of the disk drive device can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a control system related to control of the disk drive motor of an FDD according to the first embodiment of the present invention, and FIG. FIG. 3 is a flowchart showing the control procedure for start-up control, FIG. 3 is a timing chart showing how the rotation speed of the disk drive motor is controlled during chucking according to the same embodiment, and FIGS. FIG. 6 is a timing chart diagram showing how the motor rotation speed is controlled according to the third embodiment, FIG. 6 is a timing chart diagram showing how the motor is controlled during conventional chucking, and FIG.
A) to (C) are explanatory diagrams of the chucking operation of the chucking mechanism of the FDD, and FIG. 8 is a side sectional view of the main part of the chucking mechanism in a state in which chucking is completed. ■-...FDC2--Motor driver 3--Disk drive motor 4...Spindle shaft 5-Spindle hub 7...
Drive bin 8...Center hub 9-...Disc

Claims (1)

[Claims] 1) In a disk drive device that chucks a disk as a recording medium onto a disk drive motor and records or reproduces information by rotating the disk by driving the motor, starting the motor at the time of the chucking,
A disk drive device comprising: a control means for increasing the rotational speed of the motor stepwise up to a steady rotational speed at the time of startup.