JPH05182130A - Magnetic head - Google Patents

Abstract

PURPOSE:To suppress a wear at a slide contact face by forming a shape of the slide contact face of a stationary magnetic head with respect to a flexible disk to be asymmetrical in the radial direction of the flexible disk so as to increase the contact width of the slide contact face of the inner peripheral side of the disk. CONSTITUTION:A couple of magnetic heads I, II composed of a magnetic head element comprising a front core 1, a back core 2, and a coil bobbin 4 with a drive coil 3 wound thereon and slider members 6, 7 are arranged opposite to each other with a flexible disk 20 inbetween and one of the magnetic heads is designed to be a stationary magnetic head. The shapes of the slide contact faces 13, 14 of the stationary magnetic head wavelength I with respect to the flexible disk 20 are formed asymmetrical in the radial direction of the disk 20. Since the contact width (a) of the disk slide contact face placed toward the inner peripheral side of the disk 20 is extended, the wear resistance of the part is increased and the output decrease in the head I due to a stronger head contact is suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device for recording / reproducing a flexible disk, and more particularly to an improvement of a magnetic head device for a large capacity flexible disk.

[0002]

2. Description of the Related Art As a recording medium for a computer or the like, a magnetic disk in which a flexible magnetic sheet is housed in a jacket, that is, a so-called flexible disk is often used, and the increase in capacity thereof is remarkable. For example,
The capacity of the flexible disk used so far is mainly about 1 megabyte (1 MB) or 2 MB, but a 4 MB flexible disk having a capacity more than double that capacity has been introduced.

When recording / reproducing on such a large-capacity flexible disk, since the contact of the magnetic head with the flexible disk has a great influence on the electromagnetic conversion characteristics, this is dealt with by embedding the magnetic head element in the slider. I am trying. For example, in FIG.
Erase gap g _E
And magnetic head element 10 having a read _/ write gap g _{R / W}
1 is sandwiched between a pair of slider members 102 and 103,
A center groove 104 is formed on the surface facing the flexible disk by groove processing so as to substantially match the tangential direction of the disk, and both sides of the center groove 104 are made substantially symmetrical flat surfaces to be disk sliding contact surfaces 105 and 106, respectively. I try to secure a hit for the disk.

[0004]

By the way, in a disk drive device for recording / reproducing a large-capacity disk such as a 4 MB flexible disk, it is common to record / reproduce on both sides of the disk. Correspondingly, the magnetic head portions having the above-described structure are arranged on both sides of the disk. At this time, one magnetic head portion is in a fixed state (hereinafter, referred to as S0 side), and one magnetic head portion is in a state of being attached to the gimbal (hereinafter, referred to as S1 side). this is,
This is because if both magnetic heads are attached to the gimbal, vibration occurs at the time of operation, followability deteriorates, and normal recording / reproduction cannot be performed.

However, if one of the magnetic heads is fixed and the other is movable as described above, the slider shape is made smaller to accommodate a large-capacity disk, and the areas of the disk sliding contact surfaces 105 and 106 are reduced. If it is reduced, the slider wears in the magnetic head portion on the S0 side (abrasion near the disc sliding contact surface 106 located on the inner peripheral side of the disc), and the output decreases at the magnetic head portion on the S1 side facing this. The phenomenon often occurs. In particular, this tendency is remarkable in an apparatus that frequently formats a new disk, a flexible disk tester that certifies products, an apparatus that uses an abrasive disk, and the like.

Therefore, the present invention has been proposed in view of the above conventional circumstances, and it is an object of the present invention to provide a magnetic head device which is excellent in durability against abrasion and has a small variation in a hit (modulation).

[0007]

In order to achieve the above object, the present invention is directed to a pair of magnetic head portions composed of a magnetic head element and a slider member, which are arranged to face each other with a flexible disk in between, and one magnetic head is provided. In a magnetic head device having a fixed portion, the shape of the sliding contact surface of the fixed magnetic head portion with respect to the flexible disk is asymmetric in the radial direction of the flexible disk. ..

[0008]

In the conventional magnetic head device, the shapes of the disk sliding contact surfaces on the S0 side and the S1 side are the same, and the shapes of the disk sliding contact surfaces are symmetrical. That is, in the magnetic head device shown in FIG. 5, the disk sliding contact surfaces 105 and 106 are symmetrical with respect to the center groove 104, so that the disk sliding contact surfaces 105,
The hit widths L ₁ and L ₂ of 106 are almost equal.

Further, in the magnetic head device in which the magnetic head portions having the symmetrical shape of the disk sliding contact surface are arranged on the S0 side and the S1 side, the magnetic head portion on the fixed side (S0 side) is on the inner peripheral side of the disk. The vicinity of the disk sliding contact surface 106 located at is abnormally worn, resulting in a decrease in output on the S1 side.

On the other hand, in the magnetic head device of the present invention, the shape of the disk sliding contact surface is asymmetrical, and in particular, the contact width of the disk sliding contact surface located on the inner peripheral side of the disk is increased to increase this portion. Wear resistance is increased, and a decrease in output on the S1 side due to poor head contact is suppressed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments to which the present invention is applied will be described in detail below with reference to the drawings.

In the magnetic head device of this embodiment, two magnetic head portions are arranged to face each other with a flexible disk interposed therebetween,
One is fixed (S0 side) and the other is attached to the gimbal plate (S1 side). Then, by making the shape of the disk sliding contact surface of the magnetic head portion on the S0 side asymmetrical, it is configured to eliminate the contact fluctuation due to wear. Therefore, first, the shape of the disk sliding contact surface of the S0 side magnetic head portion will be described in detail.

As shown in FIGS. 1 and 2, the magnetic head portion I on the S0 side has a magnetic head element composed of a front core 1, a back core 2 and a coil bobbin 4 around which a drive coil 3 is wound, and these front cores. 1, a core retainer 5 for magnetically coupling the back core 2, a pair of sliders 6 for ensuring contact with the flexible disk,
7 and 7.

In the front core 1, side cores 10 and 11 are butted to both sides of a pair of rod-shaped center cores 8 and 9 joined together via a non-magnetic material so as not to magnetically interfere with each other via gap materials. The first magnetic gap g _{R / W} and the second magnetic gap g _E are formed on the abutting surface. Here, the first magnetic gap g _{R / W} operates as a recording _/ reproducing magnetic gap, and the second magnetic gap g _E operates as an erasing magnetic gap.

In the magnetic head portion I having the above-mentioned structure, the sliders 6 and 7 are polished so that the shape of the sliding contact surface which is in sliding contact with the flexible disk becomes appropriate. That is, the center groove 12 is cut on the slider 7 in correspondence with the running direction of the flexible disk (circumferential direction of the disk), and the peripheral portions of the sliders 6 and 7 are tapered, so that the center groove 12 is formed. The first disk sliding contact surface 13 and the second disk sliding contact surface 14 are left as flat surfaces along both sides of. Therefore, the first disk sliding contact surface 13 and the second disk sliding contact surface 14 are in direct contact with the flexible disk, and the magnetic head element is located approximately at the center of one of the disk sliding contact surfaces 13. And the first magnetic gap g _{R / W} and the second magnetic gap g _E are exposed.

Here, the shapes of the first disk sliding contact surface 13 and the second disk sliding contact surface 14 are not symmetrical with respect to the center groove 12 but are located on the inner peripheral side of the flexible disk. The contact width b of the contact surface (second disc sliding contact surface 14) is set to be larger (a <b) than the contact width a of the other sliding contact surface (first disc sliding contact surface 13).

This is because in the magnetic head portion I on the S0 side, the sliding contact surface located on the inner peripheral side (inner side) of the disk is significantly worn, and this sliding contact surface (second disk sliding surface) It is intended to suppress the wear by increasing the area of the contact surface 14).

However, if the area of the second disk sliding contact surface 14 is made too large, that is, if the contact width b is made too large, problems will occur in terms of compatibility and the like. Therefore, the range of the contact width b is 1.2a ≦ b ≦
It is preferably 1.5a. For example, when the contact width a of the first disk sliding contact surface 13 is set to 0.8 mm, the contact width b of the second disk sliding contact surface is 1.0 to
It is better to set it to 1.2 mm.

As shown in FIG. 3, the above-mentioned magnetic head portion I is arranged to face the magnetic head portion II on the S1 side with the flexible disk 20 interposed therebetween. At this time, the magnetic head portion I on the S0 side is fixed, and the magnetic head portion II on the S1 side is attached to a gimbal plate (not shown) and is movable with the pivot 21 as a fulcrum. Also, S
The structure of the magnetic head portion II on the first side is the same as that of the magnetic head portion I on the S0 side, but the first disk sliding contact surface 13
The contact width a and the contact width b of the second disk sliding contact surface are
Are almost equal.

In the magnetic head device having the above structure, the contact width b of the second disk sliding contact surface 14 is made larger than the contact width a of the first disk sliding contact surface 13, so that in this portion. The wear resistance is increased, and the decrease in the output of the magnetic head portion II on the S1 side due to the wear of the first disk sliding contact surface 13 can be suppressed. For example, in a flexible disk drive device that certifies 2ED media, both the magnetic head portions I and II have symmetrical sliding contact surfaces, and the first disk sliding contact surface is formed in both magnetic head portions I and II. 13 hit width a and second
In the case where the contact widths b of the disk sliding contact surfaces are substantially equal to each other, the output is reduced after certifying 500 or more sheets, whereas the contact width of the first disk sliding contact surface 13 of the magnetic head portion I on the S0 side is decreased. When a was 0.8 mm and the contact width b of the second disk sliding contact surface was 1.0 mm, there was almost no output reduction even after certifying 600 sheets.

Therefore, it is most suitable for a device for frequently formatting new discs, a flexible disc tester for certifying products, a device for using discs having abrasive power, and the like.

Although the embodiment to which the present invention is applied has been described above, the present invention is not limited to this embodiment. For example, the area of the sliding contact surface of the magnetic head portion on the S0 side is the magnetic head on the S1 side. By setting the area larger than the area of the sliding contact surface, the same effect as in the previous embodiment can be obtained to some extent. However, in this case, it should be noted that if the area of the sliding contact surface is excessively widened, the modulation becomes large and the 4MB flexible disk drive cannot be used.

[0023]

As is apparent from the above description, in the present invention, the shape of the sliding contact surface of the magnetic head portion on the fixed side is made asymmetric, and in particular, the contact width of the sliding contact surface on the inner peripheral side of the disk is enlarged. Since this is done, it is possible to suppress wear at this portion and prevent a decrease in output due to a variation in hitting.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of a magnetic head unit used on the S0 side of a magnetic head device to which the present invention is applied.

FIG. 2 is a schematic cross-sectional view taken along line XX of FIG.

FIG. 3 is a cross-sectional view of essential parts showing an arrangement state of an S0 side magnetic head part and an S1 side magnetic head part.

FIG. 4 is a plan view showing an example of a magnetic head portion used on the S0 side of a conventional magnetic head device.

[Explanation of symbols]

 1 ... Front core 6, 7 ... Slider 13, 14 ... Disc sliding contact surface

Claims (1)

[Claims] 1. A magnetic head device in which a pair of magnetic head portions composed of a magnetic head element and a slider member are opposed to each other with a flexible disk interposed therebetween, and one magnetic head portion is in a fixed state. The magnetic head device is characterized in that the shape of the sliding contact surface of the formed magnetic head portion with respect to the flexible disk is asymmetric in the radial direction of the flexible disk.