JPH0273565A - Magnetic head device - Google Patents

Abstract

PURPOSE:To stabilize the contact between a magnetic head and a floppy disk by providing a magnetic head part with a gap sliding part of a magnetic core, a pressed sliding part of a press member and a stabilized sliding part of a stabilizing member. CONSTITUTION:The subject device is provided with a gap sliding surface 11a having a gap part 12 equipped with a gap Grw for recording/reproducing information of a magnetic core 11 and a gap Ger for erasing both side end parts of a track, a pressed sliding surface 7a of the press member 7 for pressing a gap sliding surface 11a of the other opposite magnetic head and a stabilized sliding surface 8a of the stabilizing member 8. Since these three sliding surfaces 7a, 8a and 11a are short in length in the traveling direction of the floppy disk, the dynamic pressure effect is reduced, and the constantly stabilized contact between the magnetic head and the floppy disk can be obtained even against such a mode as pitching and rolling, etc., of the magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a magnetic head device, and particularly to a magnetic head device for recording and reproducing information on a double-sided floppy disk or the like.

[Conventional technology]

A flexible magnetic disk, also known as a floppy disk, is
It is relatively easy to handle, and large-capacity recording media that can be randomly accessed can be obtained at low cost, so it is widely used in personal computers, word processors, and the like. These types of floppy disks have changed from the initial single-sided type to double-sided types, and have become even more dense.In general, flexible disks such as floppy disks are forced to use disks. The structure is such that it is easy to generate vibrations when rotated.

When such vibrations occur, it becomes impossible to bring the magnetic head into stable contact with the floppy disk, and good magnetic recording characteristics cannot be maintained. In order to eliminate this vibration, a member with a flat sliding surface called a slider has traditionally been used, and by applying a load with a spring or the like and supporting it so as to sandwich the medium, stable contact between the head and the disk is achieved. It has been realized.

For example, the schematic structure of a magnetic head device for recording and reproducing data on a double-sided floppy disk is shown in FIG. 3, and is disclosed in Japanese Patent Application Laid-Open No. 61-22472. The key y'J of the magnetic head device shown in Fig. 3
The joint part (1) is fixed to a guide bar (not shown) that is fed in steps in the radial direction (arrow X direction) of the disk (2>) in the floppy disk drive main body, and this carriage part A movable arm portion (3) is attached to the lever 1) so as to be rotatable in six directions indicated by arrows in the figure. A pair of plate spring members (4) and (5), called gimbals, are fixed to the key y 'J joint part (1) and movable arm part (3), which become these head support arms, respectively. The opposing magnetic heads (10^), (
The floppy disk (2> ) toward the carriage part (1), and the disk (2) is held between the upper and lower magnetic heads with a pressure of 1,000 degrees.

Also, each magnetic core 1 of each magnetic head facing each other is
1^), each gap part of (IIB) <12^),
(12B) is the step feed direction (arrow X direction)
4 or 8 tracks, that is, with a predetermined offset.

Next, FIG. 4 shows an example of the configuration of the magnetic head in an exploded perspective view. In the magnetic head shown in FIG. 4, the magnetic core (11) is connected to a so-called slider (11) made of ceramic or the like.
3), sandwiched between (16) and rounded peripheral corners, and sliding surface (14) with the disk (2).

(17>) is flattened to form a groove (15) approximately in the center of the slider (13>) that extends along the disk movement direction (direction of arrow R) as the disk rotates.Magnetic core (11) In the gap portion <12>, a gap G r for recording/reproducing and a gap G 6 r for erasing both side ends of the track are formed.

[Problem to be solved by the invention]

By the way, it is desired to further increase the recording density of such floppy disks and to significantly increase the recording capacity, but for this purpose it is necessary to improve the adhesion between the head and the disk. Here, sliders commonly used in the past have a relatively wide area, for example, about 3 mm in width and 4 mm in length, so as the disk rotation speed increases, the influence of dynamic pressure (wedge effect due to air viscosity) increases. growing. Therefore, I narrowed the width of the slider and
As shown in the figure, there is a groove (1) in the center of the slider (13).
5) is generally used as a double-barrel type, but if the width is narrowed more than necessary, it will be difficult to prevent the rolling mode that occurs when the head moves in the disk radial direction (arrow X direction), so-called seek operation. It has the disadvantage of becoming weaker. Furthermore, the length of the slider also affects the dynamic pressure effect, but if this length is made shorter than necessary, it has the disadvantage of becoming weak against the pitching mode caused by disk rotation.

In addition, the dynamic characteristics of the magnetic head depend not only on the gap accuracy but also on the gap depth (although this is affected by the gap depth), in the conventional magnetic head with the above structure, the slider (13) made of ceramic,
<16) is often opaque, so it is impossible to visually check the gap depth of the gap part, and the sliding surface (14) with the magnetic medium is connected to the head core (11) and the slider (13).
), (1B> is polished with high precision by lapping after bonding, it is not possible to directly know the gap depth. For this reason, in the past, inductance, which is an electromagnetic method, has been used to manage the gap depth. This was done indirectly by measuring. However, this method had the disadvantage that the measurement was troublesome and that the gap depth could not be managed with high precision because it was an indirect measurement.

The present invention was made to solve the above-mentioned drawbacks, and it greatly reduces the spacing of the gap between the magnetic head and the floppy disk, thereby increasing the adhesion.
The purpose of this invention is to provide a magnetic head device that can further improve the recording density and also allows the gap depth to be directly measured using a microscope or the like.

Breast [Means for solving problem fish] The magnetic head device according to the present invention has a gear of the magnetic head section.
j A magnetic core having a protruding gap sliding surface including a pumping portion, and a protruding magnetic core disposed facing the opposing gap sliding surface so as to press the gap portion of the opposing magnetic head via the recording medium. A pressure member having a pressure sliding surface, and a gap between the magnetic core and the pressure member arranged at another vertex when the gap sliding surface and the pressure sliding surface are two vertices of a triangle. and a stabilizing member having a protruding stabilizing sliding surface.

[Effect]

In the magnetic head device according to the second invention, since three sliding surfaces are provided, the dynamic pressure effect is reduced, a dynamically stable system can be constructed, and the spacing between the magnetic head and the floppy disk can be reduced. It can be kept small and stable.

Furthermore, with this configuration, a sufficient portion of the side surface of the geop section of the magnetic core is exposed to allow optical observation of the gap depth, which makes it easier to connect the slider to both sides of the magnetic core. It can be easily measured using a microscope, etc.

In addition, by providing a reinforcing member, the gap sliding surface can be
Wear can be prevented.

〔Example〕

A magnetic head device according to an embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, (11) is a magnetic core, and a gap part (12) is provided with a gap G I W for recording and reproducing information on the surface of the floppy disk (2) and a gap G or for erasing both ends of the track.
> with a protruding gap sliding surface (lla) and a tapered portion (llb) for forming this sliding surface to the necessary minimum size.
), (llc). (7> is a pressure member, that is, a ceramic plate for pressure, and a floppy disk (2)
A protruding pressure sliding surface (7a) that presses the gap sliding surface (lla) of the throat to the other magnetic field facing through the
The magnetic core (11
) gap sliding surface (lla>) and tapered part (lla
) and (llc). ri8
) is a stabilizing member, that is, a stabilizing ceramic plate, which has the gap sliding surface (lla) and the pressure sliding surface (7a).
are the two vertices of a triangle, and at the position of the other vertex, insert a floppy disk (2〉) in the upper and lower magnetic heads.
Even if the floppy disk (2) is excited in pitching mode with respect to the magnetic head, the spacing between the gear slide 1/h surface (11a) and the floppy disk <2> does not change. A protruding stabilizing sliding surface (8a) that acts like this and a tapered part (8b) for forming this stabilizing sliding surface (8a) to the necessary minimum size.
), (8c). For the pressurizing ceramic plate <7) and the stabilizing ceramic plate (button), materials such as calcium titanate and barium titanate are used.

For example, the thickness T1 of the magnetic core (11) and the pressurizing ceramic plate <7> is approximately 1 mm, and the thickness T2 of the stabilizing ceramic plate (8) is approximately 0.0 mm. 5mm, length is 4
rnm, trapezoid height A1 is 1 mm, low point A2 is 0
．． 3 mm, and the gap depth is about 50 μm.

Next, the phenomenon of contact between a magnetic head having such a structure and a floppy disk will be explained in comparison with the conventional example described above.

Each sliding part <7a) compared to the conventional Herad slider.

Since the length of the floppy disk 2 in (8a>, (lla)) in the running direction is short, even if air enters the sliding part, it is immediately released, so the pressure generated by the dynamic pressure effect is small.

Therefore, the spacing between the gap sliding surface (lla) and the floppy disk (2) is
〉 rotates, there is almost no difference from when it is stationary.

In addition, floppy disks (2) are generally not flat but have warps or undulations. When such disks rotate, they excite the magnetic head, causing so-called pitching mode vibrations that cause the spacing to fluctuate. A rebitting moment is generated depending on the distance between the sliding surface (8a) and the gap sliding surface (lla) or pressurizing sliding surface (7a), which increases the rigidity of the floppy disk <2> and the leaf spring shown in Fig. 3. The posture of the magnetic head changes due to the balance with the members (4) and (5), and follows the fluctuations of the disk, thereby ensuring stable spacing at all times.

In order to quickly retrieve information stored in the tracks of the floppy disk (2), the magnetic head must be moved at high speed in the radial direction of the disk. During this so-called seek operation, the magnetic head generates rolling mode vibration, but a rolling moment is generated due to the distance between the gap sliding surface (lla) and the pressurized sliding surface (7a), so that the magnetic head is always stable as described above. can be ensured.

By providing three sliding surfaces at the vertices of the triangle in this way, it is possible to reduce the dynamic pressure effect and build a dynamically stable system, making the spacing between the magnetic head and floppy disk small and stable. can be kept.

Furthermore, with such a configuration, a sufficient portion of the side surfaces (both sides in this example) of the gap portion (12) of the magnetic core (11) is exposed to optically observe the gap depth. Compared to a method in which the slider is joined on both sides of the magnetic core, it can be easily measured using a microscope or the like.

Furthermore, compared to the conventional slider structure, since all the ceramic parts are plate-shaped, it is possible to significantly reduce costs.

In the above embodiment, the stabilizing ceramic plate (8) is bonded to the side surface of the magnetic core (11), and nothing is provided on the other side surfaces, but the pressure sliding surface (7a) and While the stabilizing sliding surface 8a> is made of ceramic that is hard to wear, the gap sliding surface <1la) is made of a magnetic material such as ferrite, so that it will not damage the magnetic head and floppy disk over a long period of time. When the gap sliding surface (lla) is slid, the wear of the gap sliding surface (lla) progresses due to the difference in specific wear amount, and the attitude of the magnetic head may change over time. To prevent this phenomenon, the magnetic core (11) is
A reinforcing seven laminated plate (9) having substantially the same shape as the magnetic core (11) and made of the same material as the pressurizing seven laminated plate (7) may be provided on the other side of the magnetic core (11).

Note that (9a) is a reinforced sliding surface, and (9b) and (9c) are tapered parts.

In addition, each tapered portion (7b) and (7c) shown in the above embodiment
), <8b), <1lb), (lie), (
9b) and (9c> may each be a stepped cutout.

〔Effect of the invention〕

As described above, according to the present invention, a magnetic core having a protruding gap sliding surface including a gap portion of a magnetic head portion, and a magnetic core having a protruding gap sliding surface including a gap portion of a magnetic head portion facing each other so as to pressurize the gap portion of the opposing magnetic head portion through a recording medium. a pressure member having a protruding pressure sliding surface disposed opposite to the gap sliding surface; and a triangular shape between the gap sliding surface and the pressure sliding surface between the magnetic core and the pressure member Since the magnetic head is equipped with a stabilizing member having a protruding stabilizing sliding surface that is placed at the position of the other apex when one apex is set, the sliding length of the magnetic head section is short, so that the effect of dynamic pressure of air is reduced. This avoids an increase in spacing, and since it has three sliding parts, stable contact between the magnetic head and floppy disk can be obtained even in modes such as m% head pitching and rolling. The gap depth of the gap portion can be directly observed optically, and the gap depth can be easily and accurately measured in the magnetic head manufacturing process, resulting in the effect that a magnetic head device with high precision can be obtained.

Furthermore, if a reinforcing member is provided, in addition to the above-mentioned effect, an effect of preventing wear of the gap sliding surface can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the main parts of a magnetic head device according to one embodiment of the present invention, FIG. 2 is an exploded perspective view showing the main parts of a magnetic head device according to another embodiment of the invention, and FIG. FIG. 4 is a side view showing a schematic configuration of a conventional magnetic head device, and FIG. 4 is an exploded perspective view showing main parts of the conventional magnetic head device. In the figure, (7) is a pressurizing ceramic plate, (7a) is a pressurizing sliding surface, <7b), (7c) is a tapered part, (8)
is a stabilized ceramic plate, (8a) is a stabilized sliding surface, (8
b), (8c) are the tapered parts, (9> is the reinforcing ceramic plate, (9a) is the reinforced sliding surface, (9b), (9c) are the tapered parts, (11) is the magnetic core, (lla) is Gi'j lub sliding surface, (llb>, (llc) is the tapered part, (1
2) is a gap portion. In the drawings, the same reference numerals indicate the same or corresponding parts. Agent Masu Oiwa Miscellaneous
2 Figure C Figure Figure 7: Ko 307 Chosu 7a 7 Cho 11 Ya 1 Gi 8 Chi γ Takuzu Koi 8a Tei Parable Tobi; @7I6C 1000th map

Claims (2)

[Claims] (1) A pair of magnetic head sections are provided that are movable in the radial direction of a flexible rotating magnetic recording medium and are arranged opposite to each other so as to sandwich the recording medium, and each of the pair of magnetic head sections In a magnetic head device in which the gap portion is attached to a support with a predetermined offset in the radial direction, the gap portion faces a magnetic core having a protruding gap sliding surface including the gap portion of the magnetic head portion. a pressing member having a protruding pressing sliding surface disposed facing the opposing gap sliding surface so as to press the gap portion of the magnetic head portion through the recording medium; and pressing the magnetic core and the pressing member. A stabilizing member having a protruding stabilizing sliding surface disposed at the other vertex when the gap sliding surface and the pressure sliding surface are two vertices of a triangle between the members. A magnetic head device featuring: (2) A reinforcing member disposed on the opposite surface of the magnetic core to the surface on which the stabilizing member is disposed, and having a protruding reinforcing sliding surface for preventing wear of the gap sliding surface. The magnetic head device according to item 1.