JPS628365A - Magnetic head device - Google Patents

Abstract

PURPOSE:To obtain a stable recording/reproduction by arranging adjacently integrally a magnetic head and a pressing pad to one face of a sheet recording medium and arranging adjacently integrally a pressing pad and a magnetic head in the opposition to other face so as to eliminate fatial deflection. CONSTITUTION:A couple of magnetic heads 1, 2 in abutting with both faces of a magnetic disc sheet 5 while being deviated are provided. Pressing pads 12, 13 clipping a recording medium 5 are arranged in opposition to the magnetic heads 1, 2. A magnetic head - pressing pad pair arranged adjacently is held integrally with the predetermined relation of position decided in a direction orthogonal to the medium face at each side of the recording medium face. The height of the magnetic head - pressing pad pair arranged adjacently is arranged accurately constantly by the incorporate holding so as to keep the medium running face stably.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a magnetic head device, and is particularly preferably applied to a recording/reproducing machine that uses a double-sided recording flexible magnetic disk sheet as a medium.

[Summary of the invention]

A pressing pad is provided opposite each of the magnetic heads that come into contact with both sides of the sheet-like recording medium, and on each side of the medium surface, the magnetic head-pressing pad pair is placed in a direction perpendicular to the medium surface. They are integrally held adjacent to each other in a positional relationship, thereby stabilizing the running surface of the recording medium.

[Conventional technology]

Flexible magnetic disk sheets, called floppy disks, are frequently used for reproducing digital or analog signals. U.S. Patent No. 4,085,42 for a double-sided recording/reproducing magnetic head device for this type of magnetic disk sheet.
What is disclosed in the specification of No. 8 is publicly known. This magnetic head device includes a pair of heads that are placed offset in the radial direction of the disk and come into contact with both surfaces of the disk, and a pair of pressing pad members are placed on the side facing each head across the magnetic disk sheet. has been done. Since both sides are not used at the same time, the pair of push back members can be selectively moved to the inactive position (removed).

[Problem that the invention seeks to solve]

In the above-mentioned conventional structure, since the pressing pad can be moved to the operating position and the non-operating position, the accuracy of holding the surface of the disk by the pair of pads is low, and it is difficult to use the front surface of the disk or the back surface. There is a problem in that the surface height of the disk differs depending on the time of rotation, making it impossible to maintain the optimum rotation surface. In particular, the head on the unused side remains in contact with the disk surface, and the adjacent unused head protrudes beyond the height of the magnetic disk sheet that is pressed and held between the head on the used side and the opposing pressing pad/nod. This may make it difficult to rotate the disc when it is flat. In such a state, harmful local vibrations (flares) of the disk surface tend to occur around the head, resulting in a decline in recording and reproducing performance.

It is conceivable to remove the unused head together with the opposing pressure pad to a non-operating position, but the operating mechanism would be extremely complicated.

In view of the above-mentioned problems, the present invention prevents the state of contact of the head and the pressing pad against the disk surface from changing when switching the recording/playback surface, and therefore the sheet-like recording medium can always be driven in an optimally flat state. The purpose is to do so.

[Failure to solve the problem]

The magnetic head device according to the present invention, as shown in FIG.
A pair of magnetic heads (1, 2) that are brought into contact with both sides of a sheet-like recording medium (magnetic disk sheet 5) in mutually shifted positions.
It is equipped with Pressing pads (1', 2, 13) are arranged opposite to each magnetic head (1, 2), sandwiching the recording medium (5).

On each side of the recording medium surface, adjacently arranged magnetic head-pressing pad pairs are integrally held in a mutual positional relationship determined in a direction perpendicular to the medium surface.

[For production]

By integrally holding the media, the heights of the magnetic pad-pushing pad pairs arranged adjacent to each other can be precisely aligned without changing, and the medium running surface can be kept stable.

〔Example〕

FIG. 1 is a side view of essential parts of a double-sided edge reproducing magnetic head device according to the present invention, FIG. 2 is a sectional view of the whole, and FIG. 3 is a front view.

As shown in FIG. 2, a pair of magnetic heads 1 and 2 are attached to the tips of an upper arm 3 and a lower arm 4, respectively.

The lower arm 4 moves in the disk radial direction parallel to the rotating surface of the magnetic disk sheet 5.

The other upper arm 3 moves integrally with the lower arm 4 and is rotatable in the direction of the disk surface via a hinge mechanism 6. When the disk is mounted, a predetermined gap is formed between the disk surface and the head 1, and during operation, the head 1 and the head 2 on the opposite side are brought into close contact with the disk surface as shown by the dashed line.

The upper arm 3 is biased in the turning direction by a coil spring 7 provided on the hinge mechanism 6, and a pressing force of 15 to 20 g is applied to the upper arm 3. Further, the navel pressure can be finely adjusted by the compression spring 8 and fine adjustment screw 9 of the hinge mechanism 6.

As shown in FIG. 1, a resin-molded magnetic head 1.2
, the core l is moved along the moving direction of the magnetic disk sheet 5.
The heads 1.a and 2a are placed on the head base 10.11 with their positions shifted in the disk radial direction in order to eliminate mutual magnetic influence. core la, 2a
The middle of the disk in the radial direction corresponds to the track width, and the magnetic gap is provided across the width of the cores la and 2b.

A pressure pad 12.13 is provided on the head base 10.11 opposite each of the heads 1.2. Preferably, the head 1 and the pressing pad 13 and the head 2 and the pressing pad 12 are preferably fixed or integrally molded. In the operating state (during recording/reproducing), each pressing pad 12.13 is pressed against the opposing head 1.2 with the magnetic disk sheet 5 sandwiched therebetween.

Individual pressure pads 12.13 are connected to adjacent heads 2 and 3.
It is fixed with respect to, and the relative position does not change. Therefore, when switching the recording/playback surface of the disc, the head 1
The state in which the disk sheet 5 is pressed and held by the pressure pad 12, the head 2, and the pressure pad 13 does not change, and an optimally adjusted state is maintained.

FIG. 4 is a longitudinal sectional view showing the height/pressure adjustment structure of one pressure pad 13, and the other pressure pad 12 has the same structure. A rotating shaft 15 is inserted into the pressing pad 13,
A felt pad 1 is placed on the end surface of the disk member 16 at the tip.
7 is fixed. The tip of the felt pad 17 has a slope 17a with a slight angle, and by applying a screwdriver or the like to a groove 183 formed in the head 18 at the other end of the rotating shaft 15 and turning the shaft 15, the head 1 of the pressing pad 13 can be rotated. The height against the head 2 can be finely adjusted, and the pressing force against the head 2 can be optimally adjusted.

As shown in the enlarged view of the head tip in FIG.
The relative height of the magnetic disk sheet 5 changes depending on the amount of protrusion of the pressing pads 12 and 13, and the flat state of the magnetic disk sheet 5 changes depending on the relative height of the heads 1 and 2. For example, the pressing pad 13 may protrude somewhat beyond the magnetic head 1, and the pressing pad 12 may
If the head 1.2 protrudes somewhat from the head 2, the magnetic disk sheet 5 will be moved along the alignment direction of the heads 1.2 as shown in FIG.
A small step appears on the surface. This step is created by head 1 as the disk rotates. Local vibrations (
This may cause rashes.

Therefore, the height is adjusted by turning the rotating shafts 15 of the pressure pads 12 and 13, so that the magnetic disk sheet 5 rotates in a nearly flat state, and harmful standing wave-like "rabbles" on the disk surface do not occur. You can do it like this.

Note that a feed screw type may be adopted as the height adjustment mechanism of the pressure pad 12.13, or a compression coil spring for pressure gfQ 71 may be incorporated.

〔Effect of the invention〕

As described above, the present invention provides a magnetic head and a pressing pad that are integrally arranged adjacent to each other on one side of a sheet-like recording medium, and a pressing pad and a magnetic head that are integrally arranged adjacent to each other on the other side of the recording medium. Because of this arrangement, the surface holding height of the medium by the head-pad pair facing each other does not differ from each other for each double-sided head, and a substantially flat medium running surface is obtained, eliminating surface roughness. Stable recording/playback operation can be obtained.

[Brief explanation of drawings]

Fig. 1 is a side view of the main parts of a magnetic gutter device for a double-sided recording/reproducing magnetic disk sheet to which the present invention is applied, Fig. 2 is a longitudinal cross-sectional view along the longitudinal direction of the head support arm, and Fig. 3 is a head - A front view of the pad pair; FIG. 4 is a vertical sectional view showing the height adjustment mechanism of the pressing pad; and FIG. 5 is an enlarged view of the main parts showing the state in which the magnetic disk sheet is crimped and held. In addition, in the symbols used in the drawings, 1.2-------・--...--Magnetic head'5・
−・−・−−1−−−・・・−Magnetic disk sheet 12
, 13...----One press basodo.

Claims (1)

[Scope of Claims] A magnetic head comprising: a pair of magnetic heads that abut mutually shifted positions on both sides of a sheet-like recording medium; and a pair of pressing pads that are arranged opposite to each head with the recording medium interposed therebetween; A magnetic head characterized in that a pair of a magnetic head and a pressing pad arranged adjacent to each other on each side of a recording medium surface is held integrally with a mutual positional relationship determined in a direction perpendicular to the medium surface. Device.