JPS61208615A - Disc driver - Google Patents

Abstract

PURPOSE:To improve the reliability by setting the direction of a gap of a magnetic head in the direction biased by a setting angle in opposite direction as the deflection angle from the central direction or radial direction of the turning center of a disc in tracing the innermost circumferential track. CONSTITUTION:The reciprocating direction of a head mechanism 11 is set in the direction B offset by an angle theta1 to the turning center O of the disc 1. Moreover, the head mechanism 11 is forwarded and a magnetic head 3 traces the innermost circumferential track T1, then the direction of the gap 16 is set so that the gap 16 of the head 3 is directed toward the turning center O of the disc 1. Thus, the track width is constituted that the track width d1 of the innermost track T1 is maximized, the track width is decreased as the track goes toward the peripheral track and the track width d2 is minimized when the outermost peripheral track T2 is traced. Thus, the amplifier correcting output difference is simplified, the driver cost is decreased, the distortion attended with signal amplification is reduced so as to improve the reliability.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to improvements in disk drive devices.

[Conventional technology]

Conventionally, this type of disk drive device is capable of moving the magnetic head 3 back and forth in the input direction toward the rotation center 0 of the disk 1, as shown in FIG.

Generally, the gap 16 of the magnetic helad 3 was made substantially coincident with the moving direction A of the head 3.

[Problem that the invention seeks to solve]

However, in the above disk drive device,
Due to its structure, the intersection angle between the gap 16 and the track T is constant in all tracks, so the track width d3 from the innermost track T1 to the outermost track T2 is necessarily the same as the gap length d3. Here, when the track width is constant, the output increases and decreases in proportion to the slowness of the 9th lap speed, so a difference occurs between the playback outputs of the inner track T1 and the outer track T2, which is due to the signal processing performed in the subsequent stage. requires some kind of correction.

Conventionally, to solve this problem, a method was adopted in which an amplifier was installed to correct the output so that the output remained approximately constant regardless of the track position, but the distortion of the signal caused by passing through the amplifier was unavoidable and the reliability deteriorated. There were drawbacks such as chipping and an unavoidable increase in the price of the entire device.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a disk drive device that can output a substantially constant output over the entire track without any special device.

[Means for solving problems]

The present invention is characterized by the direction in which the magnetic head 3 moves and the direction of the gap 16 of the head 3, as shown in FIG.

That is, instead of moving the magnetic head 3 in the disk radial direction A in the conventional disk drive device, the magnetic head 3 is moved back and forth in a direction B that is shifted by a certain angle θ1 from the direction A toward the rotational center direction O of the disk 1. According to
It is possible to trace from the innermost track TI to the outermost track T2 using the gap 16 of the magnetic head 3.
Furthermore, the direction of the gap 16 of the magnetic head 3 is adjusted so that when the magnetic head 3 traces the innermost track T1, it faces toward the 0 direction of the rotation center of the disk 1, or it faces in the direction opposite to the direction of displacement of the head 3 by an angle θ2. The position is set by offsetting it.

[Effect]

With the above configuration, the track width becomes the maximum dl at the innermost track TI.

However, as the magnetic head 3 moves from the innermost track to the outermost track, the direction of the gap 16 gradually deviates from the direction of the center O of the disk 1, and as a result, the trunk width becomes smaller than the innermost trunk T1. is the maximum, and gradually decreases toward the outermost track T2, and the track width reaches the minimum d2 at the outermost track T2.

Here, the magnitude of the reproduction output signal from the magnetic head 3 increases as the trunk width and circumferential speed increase; however, in the present invention, the track width d2 of the track T2 on the outer circumferential side where one circumferential speed is faster is the circumferential speed. Since the trunk width d1 is set to be smaller than the trunk width d1 of the slower inner track T1, the difference in the magnitude of the output signal taken out from the magnetic head 3 between the innermost track T1 and the outermost track T2 is reduced. It will be done.

Note that the larger the shift θl of the magnetic head 3 in the moving direction, the larger the rate of change in track width can be. However, when erasing heads are attached to both sides of the recording magnetic head 3 to regulate the track width, the recording track width is further narrowed by the erasing head.
It is preferable to set it to 0 degrees or less.

Also, when tracing the innermost track T-ri, the gap 16
The track width dl is set to face the direction of the rotation center O of the disk 1, so that the track width dl matches the length d3 of the gap 16.

Furthermore, the larger the deviation θ2 from the disk center O, the more
Track@d can be made small over all tracks. However, if θ2 is increased, the track width at the outermost circumference becomes too narrow, so it is preferably 35 degrees or less.
From the viewpoint of ease of setting the head position, θ2=0 is preferable.

〔Example〕

The present invention will be described below as an example implemented on a floppy disk, but it goes without saying that it can be implemented on various types of magnetic disks such as hard disks.

The disk drive device according to the present invention, as shown in FIGS. 2 and 3, has a disk drive section 2 that rotationally drives a magnetic disk 1, as in the conventional case.

It is composed of a head drive unit 4 that moves the magnetic head 3 back and forth.

The magnetic disk 1 includes a sheet-like disk made of synthetic resin with a hub hole 5 in the center, and magnetic layers 6 formed on both sides of the disk.
It is inserted into the jacket 7 and can be freely inserted into the device.

The disk drive unit 2 connects the disk 1 to the rotating shaft 9 of the motor 8.
The hub hole 5 of the disk 1 is locked so that a film can be deposited freely, and the disk 1 is rotated at high speed.

The head drive unit 4 has a head feeding mechanism 14 consisting of a stepping motor 12 and a belt 13 that moves the head mechanism 11 in a predetermined pinch sequence on the base end side of the head mechanism 11 that is guided by a guide 10 and capable of linear reciprocating motion. On the other hand, the magnetic head 3 is attached to the tip side so that the magnetic layer 6 can be accessed from the head window 15 of the jacket 7.

The present invention is characterized by the moving direction of the head mechanism 11 and the mounting direction of the magnetic head 3 attached to the head mechanism 11.

That is, the reciprocating direction of the head mechanism 11 is set to a direction B offset by an angle θ1=15 degrees with respect to the rotation center O of the disk 1, as shown in FIG. When the head mechanism 11 moves further forward and the magnetic head 3 traces the innermost track T1, the gap 16 of the head 3 closes to the disk l.
By setting the direction of the gap 16 so as to face the rotation center O direction, the track width d1 of the innermost track T1
The track width is set to be the maximum, and the track width is reduced as it moves toward the outer track, and the outermost track T2 is configured so that the track width is reduced to the minimum d2 during tracing.

Note that as the deviation θ2 of the gap 16 from the disk center O increases, the track width decreases over all the tracks.
It can support higher density during recording and reproduction.

〔Effect of the invention〕

As described above, the present invention offsets the moving direction of the magnetic head 3 from the conventional disk radial direction A, and when the magnetic head 3 traces the innermost track T1, the gap 16 of the head 3 is offset from the rotation of the disk 1. The direction was set either in the direction of the center O or deviated 02 to the front side.

As the track width d traced by the gap 16 gradually decreases as it moves from the innermost track T1 to the outermost track T2, the output voltage at the inner and outer tracks becomes smaller without the need for additional equipment such as an amplifier. This has the advantage that the difference can be reduced, the amplifier for correcting the output difference can be simplified, the cost of the device can be reduced, and the distortion accompanying signal amplification can be reduced and reliability can be improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the concept of the present invention, FIG. 2 is a plan view showing an example of implementation, and FIG. 3 is a front view. FIG. 4 is an explanatory diagram showing a conventional example. 1...Magnetic disk. 2...Disk drive section. 3...Magnetic head. 11...Head mechanism. 16...Gap. Inventor Hiroshi Maruyama Fumihiro Figure 2 Figure 3

Claims (1)

[Claims] The moving direction B of the magnetic head 3 is deviated by an angle θ_1 from the radial direction A of the disk 1, and the innermost track T_
1. A disk drive characterized in that, during tracing, the direction of the gap 16 of the magnetic head 3 is set in the direction of the rotation center O of the disk 1 or in a direction opposite to the above-mentioned θ_1 and deviated from the rotation center O by an angle θ_2. Device.