JP2000113561A - Load pressure variable device of disk drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate fine adjustment of a load pressure and to make the device strong against shock or vibration by movably pressing the head arm to a magnetic disk side through energization to a piezoelectric member and to a diamagnetic disk side through the cut-off of such energization. SOLUTION: With a piezoelectric rubber 8 energized and with a spindle motor rotatably driven at a prescribed low speed, the length of the piezoelectric rubber 8 is reduced in resistance against elasticity, imparting a rotary pressing force to a pair of upper and lower head supporting leaf springs 2, 3 in the direction of the arrow a1. Then, a load pressure F1, which is the contact load of the pair of upper and lower magnetic heads 6, 7 against the upper and lower faces of a small capacity floppy disk FD, is automatically adjusted to a prescribed high load pressure, the optimum value. As a result, centering for example can be surely carried out for a small capacity floppy disk FD against the center of the spindle for the purpose of recording/reproducing in a small capacity of data such as 1-2MB or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a variable load pressure device of a disk drive device most suitable for applying to a floppy disk drive for recording and / or reproducing a magnetic disk such as a floppy disk. It is.

[0002]

2. Description of the Related Art Conventionally, a recording capacity for using, for example, a 3.5-inch floppy disk is 1-2 MB.
In the current small-capacity (low-capacity) floppy disk drive (megabyte), a pair of magnetic heads are driven while chucking a loaded floppy disk on a disk table of a spindle motor and rotating at a low speed of 300 rpm. Data is recorded and reproduced by seeking while keeping both sides of the floppy disk in contact. At this time, the substantially square chucking hole formed at the center of the center core of the floppy disk is inserted into the spindle of the spindle motor, and the drive pin on the disk table is inserted into the substantially rectangular positioning hole formed at the eccentric position of the center core. Is inserted, and the drive pin is pressed relatively to the corner portions of two right-angled edges on the outer peripheral side and the rotation direction side of the positioning hole by using the friction torque of the floppy disk in the floppy disk cartridge. This provides a unique centering that mechanically centers the floppy disk with respect to the center of the spindle. In order to obtain the friction torque of the floppy disk, the load pressure, which is the contact load of the pair of magnetic heads on the floppy disk, is set at 10 to 30 g / cm.

[0003]

On the other hand, the applicant of the present invention has already developed a large-capacity (high-capacity) floppy disk in which the recording capacity has been increased to 100 MB or more. In order to perform recording and reproduction at a higher density as described above, it is necessary to rotate the floppy disk at a high speed of 3600 rpm or more, but it is also necessary to reduce the thickness of the magnetic layers on both surfaces of the floppy disk. Since the durability of the floppy disk decreases due to the thinning of the magnetic layer, the load pressure of the pair of magnetic heads on the floppy disk must be reduced to prevent damage to the thinned magnetic layer of the high-speed rotating floppy disk. Needs to be set low, preferably a floating type (flying head).

Therefore, when newly developing a large-capacity (high-capacity) floppy disk drive having a recording capacity of 100 MB or more, considering the compatibility with the existing small-capacity floppy disk, the use of the small-capacity floppy disk is difficult. When a large capacity floppy disk is used, it is necessary to vary the load pressure of a pair of magnetic heads on the floppy disk.

Therefore, as a prior art of this variable load pressure device, a pair of electromagnets are mounted on the opposing surfaces of a carriage and a head arm as described in Japanese Patent Application Laid-Open No. Hei 2-210660, and these electromagnets are energized. By
A device in which an attractive force or a repulsive force is generated in these electromagnets to vary the load pressure of a magnetic head by a load spring has already been disclosed.

However, in a mechanism in which the load pressure of a magnetic head is varied by a load spring using the attraction force or repulsion force of a pair of electromagnets as in the prior art of this load pressure variable mechanism, the attraction force of the electromagnet is reduced. Because it attenuates in proportion to the distance, it is difficult to finely adjust the load pressure, and it is very susceptible to shocks and vibrations.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and it is easy to finely adjust the load pressure, and the load pressure variable device of the disk drive device is very resistant to shock and vibration. It is intended to provide.

[0008]

According to a first aspect of the present invention, there is provided a variable load pressure device for a disk drive apparatus, comprising: a carriage, on which a magnetic head is mounted via a head arm; While energizing the magnetic disk side or anti-magnetic disk side, energizing the piezoelectric member energizes the head arm toward the magnetic disk side and cutting off the energizing of the piezoelectric member to thereby deactivate the head arm anti-magnetic disk. It is designed to be biased to move to the side.

With the load pressure varying device of the disk drive device of the present invention configured as described above, the energization of the piezoelectric member urges the head arm to move toward the magnetic disk, thereby loading the magnetic head onto the magnetic disk. By increasing the pressure and cutting off the power supply to the piezoelectric member, the head arm is moved and biased toward the anti-magnetic disk side, and the load pressure of the magnetic head on the magnetic disk is reduced to zero or lower.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a variable load pressure device in a large-capacity (high-capacity) floppy disk drive to which the present invention is applied will be described below with reference to the drawings.

First Embodiment In other words, as shown in FIGS. 1 and 2, a variable load pressure device of a large-capacity floppy disk drive as a disk drive device comprises load springs above and below a carriage 1. A pair of upper and lower head arms 4 and 5 are attached via a pair of upper and lower head arm supporting leaf springs 2 and 3 so as to be able to move up and down in the directions of the arrows a and b. A pair of upper and lower magnetic heads 6 and 7 are mounted on the upper and lower opposing surfaces of the tips of 4 and 5. In this embodiment, the pair of upper and lower magnetic heads 6, 7 are moved (rotated) in the direction of arrow a on the floppy disk by the pair of upper and lower head arm supporting leaf springs 2, 3.

A piezoelectric rubber 8 which is an example of a piezoelectric member
Are disposed between a pair of upper and lower head arm supporting leaf springs 2 and 3, and upper and lower end surfaces 8a and 8b of the piezoelectric rubber 8 are bonded to upper and lower opposing surfaces of the pair of upper and lower head arm supporting leaf springs 2 and 3. It is fixed with screws or screws. As shown in FIG. 1, the length L1 of the piezoelectric rubber 8 in the vertical direction is reduced against elasticity when energized, and as shown in FIG. The lengths L1 and L2 are configured to be changed between when energized and when not energized so as to be extended.

Next, FIG. 3 shows a current small-capacity (low-capacity) floppy disk FD having a recording capacity of 1 to 2 MB and a recording capacity of a floppy disk which is a magnetic disk being 100 MB.
Based on detection signals from the small capacity detection switch 11 and the large capacity detection switch 12 which are the recording capacity detecting means of the large capacity (high capacity) floppy disk HFD which has been increased to more than MB, the piezoelectric rubber 8 is turned ON (energized) -OFF ( Disconnect current)
1 shows a control circuit 13 which is a control means for performing the control. The control circuit 13 also controls the rotation speed of a spindle motor 14 that drives the floppy disk to rotate, and also controls the transfer of a head transfer mechanism 15 that transfers the carriage 1 in the directions of arrows c and d.

This variable load pressure device is constructed as described above. First, as shown in FIG. 1, when a small-capacity floppy disk FD is loaded by a small-capacity floppy disk cartridge FDC, as shown in FIG. As shown in FIG. 6, the small capacity detection switch 11 is turned on,
The control circuit 13 energizes the piezoelectric rubber 8 and drives the spindle motor 14 to rotate at a low speed of 300 rpm.

Then, as shown in FIG. 1, the length L1 of the piezoelectric rubber 8 is reduced against elasticity, and a rotational urging force in the direction of arrow a1 is applied to the pair of upper and lower head supporting leaf springs 2, 3. Can be The load pressure F1, which is the contact load of the pair of upper and lower magnetic heads 6 and 7 on the upper and lower surfaces of the small-capacity floppy disk FD, is applied to the small-capacity floppy disk FD.
It is automatically adjusted to a high load pressure of about 10 to 30 g / cm, which is an optimal value for D. Then, the small-capacity floppy disk FD is rotated at a low speed of 300 rpm by the spindle motor 14, and the centering of the small-capacity floppy disk FD with respect to the center of the spindle for recording and reproducing a small capacity of 1 to 2 MB of data. Can be performed reliably.

Next, as shown in FIG. 2, when the large-capacity floppy disk HFD is loaded by the large-capacity floppy disk cartridge HFDC,
As shown in FIG. 3, the large-capacity detection switch 12 is turned on, the control circuit 13 cuts off the power supply to the piezoelectric rubber 8, and drives the spindle motor 14 to rotate at a high speed of 300 rpm.

Then, as shown in FIG. 2, the length L2 of the piezoelectric rubber 8 is extended in the vertical direction by elastic restoration, and the rotational urging force in the direction of arrow b1 is applied to the pair of upper and lower head supporting leaf springs 2, 3. Added. The load pressure F2, which is the contact load of the pair of upper and lower magnetic heads 6 and 7 on the upper and lower surfaces of the large-capacity floppy disk HFD, is 0 g / cm or 10 g / cm or less, which is the optimum value for the large-capacity floppy disk HFD. Automatically adjusted to low load pressure F2.

According to this variable load pressure device, the piezoelectric rubber 8 is interposed between the pair of upper and lower head arm supporting springs 2 and 3, and the vertical length L1, Due to the change in L2, the pair of upper and lower head arms 4, 5 are mechanically urged to rotate in the directions of arrows a1 and b1, which are the floppy disk side and the anti-floppy disk side, so that the small-capacity floppy disk FD and the large-capacity floppy disk. Since the load pressures F1 and F2 of the pair of upper and lower magnetic heads 6 and 7 with respect to the disk HFD are configured to be variable, fine adjustment of the load pressures F1 and F2 can be easily performed, and very resistant to shock and vibration. A variable load pressure device for a disk drive device can be realized. Although the large-capacity floppy disk HFD has compatibility with the small-capacity floppy disk FD, the floppy disk used mainly is the large-capacity floppy disk HFD.
When the D is loaded, the piezoelectric rubber 8 is energized, and when the large-capacity floppy disk HFD is loaded, the piezoelectric rubber 8 is maintained in a non-energized state.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made based on the technical concept of the present invention. For example, in the above-described embodiment, the pair of upper and lower magnetic heads 6 and 7 are moved (rotated) in the direction of arrow a on the floppy disk by the pair of upper and lower head arm supporting leaf springs 2 and 3 so as to urge them. The load pressures F1, F2 of the pair of upper and lower magnetic heads 6, 7 are made variable by energizing and de-energizing the piezoelectric rubber 8, but the pair of upper and lower head arm supporting leaf springs 2, 3 is connected to an anti-floppy disk. In a state in which the piezoelectric rubber 8 is energized (rotated) in the direction of the arrow b, the load pressure F1, F2 of the pair of upper and lower magnetic heads 6, 7 is varied by cutting the energization and non-energization of the piezoelectric rubber 8. You may. Further, the piezoelectric member is not limited to the piezoelectric rubber 8 whose lengths L1 and L2 are changed by energization and cutoff of the energization, but various kinds of piezoelectric members such as bimetals whose bending amount changes by energization and cutoff of the energization are applied. be able to.

[0020]

The load pressure varying device for a disk drive device according to the present invention having the above-described structure has the following advantages.

According to a first aspect of the present invention, by energizing the piezoelectric member, the head arm is urged to move to the magnetic disk side to increase the load pressure of the magnetic head on the magnetic disk and cut off the energization to the piezoelectric member. As a result, the head arm is moved and biased toward the anti-magnetic disk side so that the load pressure of the magnetic head on the magnetic disk is reduced to zero or low.
The fine adjustment of the load pressure can be easily performed by utilizing the change in the length of the piezoelectric member, and the head arm can be mechanically moved and biased to the magnetic disk side and the anti-magnetic disk side by the piezoelectric member. Thus, it is possible to realize a load pressure variable device of a disk drive device that is extremely resistant to shock and vibration.

According to a second aspect of the present invention, the length of the piezoelectric member is changed between when the power is supplied and when the power is not supplied. Therefore, the piezoelectric member has a very simple structure in which the piezoelectric member is interposed between the pair of upper and lower load springs. This makes it possible to finely adjust the load pressure and realize a load pressure variable device of a disk drive device that is extremely resistant to shock and vibration.

According to a third aspect of the present invention, when the recording capacity detecting means detects a small capacity of the magnetic disk, the control circuit is adapted to energize the piezoelectric member, so that the load pressure is changed according to the recording capacity of the magnetic disk to be loaded. In addition to being capable of automatic adjustment, the piezoelectric member is energized only when a small-capacity magnetic disk used as a secondary is loaded into a large-capacity magnetic disk used mainly, and power saving is obtained. .

[Brief description of the drawings]

FIG. 1 is a side view illustrating a high load pressure state in a variable load pressure device of a large capacity floppy disk drive to which the present invention is applied.

FIG. 2 is a side view illustrating a low load pressure state according to the first embodiment.

FIG. 3 is a block diagram illustrating a control circuit according to the first embodiment.

[Explanation of symbols]

1 is a carriage, 2 and 3 are head arm supporting leaf springs which are load springs, 4 and 5 are head arms, 6, 7
Denotes a magnetic head, 8 denotes a piezoelectric rubber as a piezoelectric member, 11, 1
Reference numeral 2 denotes a small-capacity detection switch and a large-capacity detection switch as recording capacity detection means, and 13 a control circuit as control means.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yasushi Tomita 6-35 Kita Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5D039 AA01 BA01 BB01 BC27 BC28 BC29 BC33

Claims (3)

[Claims] A magnetic head mounted on a carriage via a head arm; a load spring for urging the head arm toward a magnetic disk or a semi-magnetic disk; and energizing the head arm toward the magnetic disk. A load pressure variable device for a disk drive device, comprising a piezoelectric member which urges to move and urges the head arm to move toward the anti-magnetic disk by cutting off the power supply. 2. The load of a disk drive device according to claim 1, wherein the piezoelectric member of the load pressure variable device according to claim 1 is configured to change its length between when energized and when not energized. Variable pressure device, 3. The piezoelectric member of the load pressure variable device according to claim 1 or 2, further comprising a control circuit that is energized when the recording capacity detecting means detects a small capacity of the magnetic disk. Variable load pressure device for disk drive devices.