JPS6398814A - Magnetic head - Google Patents

Abstract

PURPOSE:To contrive to facilitate the winding of a coil and the leadout of terminals and to improve the magnetic characteristic by joining an auxiliary core whose cross section is nearly channel shape to one side of the magnetic core in the running direction of a recording medium and a slider at both sides in the track width direction. CONSTITUTION:The auxiliary core 10 is joined to the rear side of the head part 2 of the magnetic core 1 comprising the erasure head part 2 and a recording/reproduction head part 5, and the slider members 20, 30 are joined at both sides of the core 1 in the track width direction. A notch 11 is provided at the bonding face of the core 10 and air gap formed with a side core 4 is utilized to wind the coil 40. Moreover, coil winding grooves 21, 31 are provided to the members 20, 30 to attain the winding of the coils 40, 41 and to lead out the terminals to the side face of the head 5 via the grooves 21, 31 of the members 20, 30. No thin thickness is required to be applied to the core 4 in the structure above. thus, the magnetic characteristic is improved and the winding and terminal leadout of the coils are facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a composite type magnetic head that is formed by integrating, for example, a magnetic head for recording and reproducing and a magnetic head for erasing.

[Summary of the invention]

The present invention provides a magnetic head in which a slider member is integrated into a magnetic core portion having a first working gap and a second working gap, wherein at least one side of the magnetic core portion in the running direction of a magnetic recording medium has a substantially circular cross section. The letter-shaped auxiliary core is joined together with a slider member provided with a coil winding groove, and the coil is connected to the magnetic core through the gap formed between the magnetic core and the auxiliary core. By winding the coil and pulling out the end of the coil from the coil winding groove of the slider member, the terminal of the coil can be easily taken out without being affected by the attachment of the flexure.

[Conventional technology]

In recent years, floppy disks and hard disks have been used as external storage devices for computers, etc., and even thin films coated with magnetic material are attached to donut-shaped rigid substrates to create a storage capacity M comparable to that of a bar disk. A stick-on type disk that can be easily handled like a floppy disk has been developed and put into practical use.

In order to achieve even higher density recording in this type of disk-shaped medium, the magnetic powder used is being actively improved. In other words, the magnetic powder is
The trend is toward higher coercive force and higher residual magnetic flux density.

With the progress of such magnetic recording media, various improvements have been made in the field of magnetic heads.

For example, with the increasing resistance of magnetic powder, magnetic heads for erasing and magnetic heads for recording and reproducing are integrated into a composite in order to obtain sufficient erasure rate characteristics even when signals are overlapped. A so-called advance erase type composite magnetic head is used.

This advance erase type composite magnetic head consists of a center core (101a) and a side core (101a), as shown in FIG.
101b) and the joint interface between the center core (102a) and side cores (102b), respectively.
To erase with 71g+ and recording/reproducing gap g2 - The magnetic core section, which is constructed by compositely integrating the throat section (101) and the recording/reproducing head section (102) via a non-magnetic material (103), is connected to the slider member ( It has a structure in which the two side cores (101b) are sandwiched between the cores (not shown).
, (102b) are provided with coil winding grooves (101c) and (102c) for winding the coils, respectively, and coils (104) and (105) are wound therein.

[Problem that the invention seeks to solve]

By the way, usually the above coils (104) and (105)
Due to the structure of the head, is wound around the lateral side of the side core (101b) on the erasing head section (101) side, and around the lower end side of the side core (102b) on the recording/reproducing head section (102) side. . Then, to the above recording and playback,
On the side of the side core (102), a so-called flexure (9 not shown) is adhesively fixed via an adhesive groove (106) at the lower end of the side core (102b) in order to ensure vibration resistance of the magnetic head. It looks like this.

In this way, the adhesive groove (10
Since a flexure is attached to 6), it is difficult to take out the terminal of the recording/reproducing coil (105) wound around this part, and an improvement is desired.

In view of this situation, a structure may be considered in which the side core (102b) has a smaller extension dimension so that the terminal can be brought out even when the flexure is attached, but in this case,
Since the core of the coil (105) is thin, there are problems in terms of magnetic efficiency, such as increased magnetic resistance.

The present invention has been proposed in view of the above-mentioned circumstances, and provides a composite type magnetic head that allows coil terminals to be easily brought out without being affected by the attachment of a flexure, and that exhibits excellent magnetic properties. The purpose is to

[Means for solving problems]

In order to achieve the above object, the magnetic head of the present invention has the following features:
In a magnetic head in which a slider member is integrated into a magnetic core portion having a first operating gap and a second operating gear knob, an auxiliary member having a substantially U-shaped cross section is provided on at least one side of the magnetic core portion in the running direction of the magnetic recording medium. A core is joined to the slider member, and a coil winding groove is cut out in the slider member, and a coil is wound around the magnetic core through a gap formed between the magnetic core and the auxiliary core. , the end of the coil is pulled out from the coil winding groove of the slider member.

[Effect]

In the magnetic head of the present invention, an auxiliary core having a substantially U-shaped cross section is joined to at least one side of the magnetic core portion in the running direction of the magnetic recording medium, and a slider member provided with a coil winding groove is integrated. A coil can be wound around the magnetic core through a gap formed between the magnetic core and the auxiliary core. At the same time, the end of the coil can be pulled out to the side surface of the magnetic core portion through the coil winding groove of the slider member.

Therefore, the flexure can be freely adhesively fixed to the lower end surface of the magnetic head, and the terminal of the coil can be easily brought out.

〔Example〕

Next, embodiments to which the present invention is applied will be described with reference to the drawings.

In the following description, an embodiment in which the present invention is applied to a magnetic head mounted on a disk drive device of the above-mentioned stick-on type will be described with reference to FIGS. 1 to 3.

This magnetic head includes a magnetic core part (1) formed by joining an erasing head part (2) and a recording/reproducing head part (5) together via a non-magnetic material (8), and a magnetic core part (
1) an auxiliary core (lO) joined adjacently to the rear in the magnetic recording medium running direction X; and slider members (20) provided on both sides of the magnetic head section (1) in the track width direction;
(30) It is composed of Further, the magnetic recording medium sliding contact surface (1a) is processed into a spherical shape to ensure contact with the medium.

Head section (2) for erasing gaps, which constitutes the magnetic core section (1) above.
The recording/reproducing head section (5) includes a pair of rod-shaped center cores (3), (3), which are joined via a non-magnetic material (8) made of 5iOz, crystallized glass, etc. to prevent magnetic interference. 6), a side core with a roughly U-shaped cross section (
4) and (7) are butted against each other, and each joint interface serves as an erasing gap g1 and a recording/reproducing gear g2, respectively. The trunk width TI of the erasing head section (2) is set larger than the track width T2 of the recording/reproducing head section (5), so that even if there is a slight off-track state, the signal on the medium can be maintained. can be completely erased. Therefore, erasure rate characteristics are ensured, and distorted recording and reproduction can be obtained. Then, the grooves (4) bored in each of the side cores (4) and (7) are
a) and (7a) include coils (40) and (7a), respectively.
41) is mounted in an S-mounted manner, and its terminal is pulled out to the side of the head.

Here, the length β·m in the depth direction of these side cores (4) and (7) is different, and the side core (4) on the joining side of the auxiliary core (10) [the erasing head section (2) side in this embodiment]
The length l is set smaller than the length m of the other side core (7). Therefore, a groove is formed at the lower end of the magnetic head by the erasing head section (2) and the auxiliary core (10), and this groove constitutes a part of the adhesive groove of the flexure.

Further, the magnetic recording medium traveling direction X of the magnetic core portion (1)
The auxiliary core (10) joined to the rear of the slider member (20) and (30) is made of the same material as the slider members (20) and (30), for example, a non-magnetic material such as barium titanate or calcium titanate. Therefore, there is no fear that the wear resistance of the head will be impaired.

Furthermore, the erasing head section (2) of the auxiliary core (10)
For example, a notch (11) for a rectangular coil winding is provided on the joint surface side with the auxiliary core (10) and the side core (4). A coil (40) is wound around the side core (4).

The notch (11) is formed such that the distance '4C2 from the magnetic recording medium sliding contact surface (la) to the notch (11) is larger than the depth C1 of the erasing head (2). ing. Therefore, even if the magnetic head is used until the depth C1 reaches O, the auxiliary core (10) is reliably fixed to the magnetic core portion (1).

Further, at the lower end of the auxiliary core (10), 2g (12
) is formed, and together with the side core (4), constitutes a part of the adhesive groove of the flexure.

Magnetic core part (1) and auxiliary core (10) with such configuration
A pair of slider members (20
) and (30) are joined and integrated by glass fusing or resin adhesion.

Here, the slider members (20) and (30) are provided with coil windings to enable winding of the coils (40) and (41), respectively, and to draw out the terminals of the coils (40) and (41). Line grooves (21) and (31) are cut out.

The coil winding grooves (21) and (31) have a groove width D+ of the side core (7) of the recording/reproducing head (5).
It is cut and formed so that it is longer than the distance MD2 from the auxiliary core (10) to the notch (11) provided in the auxiliary core (10).

The coil (40) of the erasing head section (2) is
Space between the groove (4a) of the side core (4) and the notch (11) of the auxiliary core (10) and the slider member (20)
, (30) for coil l'(+1 (21) ,
It is wound around the side core (4) using the space created by (31). Further, the terminal end of the coil (40) passes through the coil winding grooves (21) and (31) and is drawn out to the side surface on the recording/reproducing head section (5) side. Similarly, the terminal of the coil (41) of the recording/reproducing head section is also drawn out to the side.

The length C1 from the coil wire grooves (21) and (31) to the +U recording medium sliding contact surface (1a) is set larger than the depth C1 of the erasing head (2), so that the head is not worn out. Also, sufficient bonding strength is maintained.

Further, on the lower end side of the slider members (20) and (30), an adhesive groove (12) provided in the auxiliary core (10) is provided.
) are formed to be flush with the adhesive grooves (22) and (32). And the above adhesive? M (22),
(32) is the erasing head part (2) and the auxiliary core (10)
A series of grooves for adhering the flexible jar are formed by >W (12), and the flexible jar is adhesively fixed to the '12↓.

In this way, in the present invention, each head part (2), (5)
The terminals of the coils (40) and (41) wound around the magnetic head are pulled out from the side surface of the head, and the adhesive position of the flexure is set in the adhesive groove (12) provided at the lower end of the magnetic head.
(22) and (32).

Therefore, in the head part on the Ll side where the flexible jar is attached (the erasing head part (2) in this embodiment), the wall thickness (cross-sectional area) of the side core (4) can be ensured without considering the mounting of the flexible jar, etc. There is no concern that the magnetic resistance of the head will increase. Furthermore, the installation of the flexure has the great feature of increasing the degree of freedom in positioning.

As a result, the recording and reproducing efficiency of the magnetic head is improved, and a short magnetic path winding is realized, so that a magnetic head with excellent recording and reproducing characteristics can be provided. In addition, a coil (40),
Since the terminal processing of (41) is also facilitated, the assembly work is simplified, and there are no coil breakage defects, etc., and the yield is improved.

Next, in order to make the structure of the magnetic head of the above embodiment more clear, a method of assembling the magnetic head will be briefly explained with reference to the drawings.

To create the magnetic head of the above embodiment, first, as shown in FIG. 4(A), center cores (51) and (61) are formed.
and a groove for winding the coil (52A), (62
The side cores (52) and (62) in which A) is notched are joined and integrated by glass fusion method through gap spacers of different film thickness, respectively, to form erased core blocks (50).
and a recording/reproducing core block (60) is created. In addition, each of the above core members (51), (52), (61)
, (62) includes a track width regulating groove (50a) for regulating the track width.

(60a) respectively with trunk width T1. T2 (TI
＞'h) Notched non-magnetic material (53), (
63) is melt-filled.

Next, as shown in FIG. 4(B), consider the optimal conditions for contact with the medium, crosstalk between each head, etc.
The joint surfaces of the center cores (51) and (61) are adjusted to predetermined thicknesses L+ and Lx by cutting, polishing, or other means. In this example, both center cores (
51), the thicknesses Ll and L2 of (61) are each 115
It was set as μm.

Next, as shown in FIG. 4(C), the erase core block (50) and the recording/reproducing core block (60) are
A composite block (71) is created by joining and integrating the components while aligning the tracks so as to sandwich a non-magnetic material (70) as a countermeasure against crosstalk.

On the other hand, as shown in FIG. 4(D), it is made of a non-magnetic material such as barium titanate, and is used for coil winding. M (76)
An auxiliary core (75) is prepared by cutting. The coil winding groove (76) has a dimension of 62 in the composite block (76).
It is formed to be larger than the depth C1 of 1).

Then, this auxiliary core (75) is attached to the composite block (75).
1) from the erasing block (50) side by glass fusion method or resin adhesion, and then attach the head block (
80).

Next, as shown in FIG. 4(E), the cutting line (Y-YvA
) and (Y'-Y' line), slining processing is performed to create a plurality of head chips.

Finally, after polishing both slicing surfaces of the obtained head chip, a pair of slider parts with coil winding grooves +
4 are joined together, and the magnetic recording medium sliding contact surface is polished into a spherical surface to complete the magnetic head shown in FIGS. 1 to 3.

Note that the adhesive part of the flexure may be formed in advance on each member and then integrated, or as shown in Fig. 4 (
After joining the auxiliary core (75) shown in D) or after joining the slider member, it may be formed all at once using a rotary grindstone or the like.

In this way, in the magnetic head of the present invention, the auxiliary core (
75) into a composite block (7D), the other steps can be made without changing the previous manufacturing process, so productivity and mass production can be maintained at the current level.

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and various structures may be adopted without departing from the spirit of the present invention.

For example, in the previous embodiment, the auxiliary core was integrated into the erasing section 1' side, but it goes without saying that similar actions and effects can be obtained even if it is connected to the recording/reproducing head section side.

Further, as shown in FIG. 5, a magnetic core section (1) having an erase gear, g, and a recording/reproducing gap gt is disposed approximately at the center of the magnetic head, and the magnetic core section (1) has a magnetic recording/reproducing gap gt. Auxiliary cores (82) and (83) each having a substantially U-shaped cross section are joined to both sides (front and rear sides) in the medium running direction X, and are further used for coil winding. The slider members (84) and (85) on which a (84a) and (85a) are formed may be integrally joined together. In this way each working gap 1
By arranging °g2 approximately at the center of the head, there are advantages such as good contact between the head and the medium.

Alternatively, although the above embodiment has been described using a pre-erase type magnetic head as an example, a magnetic head mounted on a floppy disk drive device may be used.

That is, it goes without saying that the present invention is also applicable to a so-called tunnel erase type magnetic head, etc., in which a pair of erasing operating gaps are provided on both sides of the rear side of a recording/reproducing operating gap.

〔Effect of the invention〕

As is clear from the above description, the magnetic head of the present invention integrates an auxiliary core having a groove for winding a coil on at least one side of the magnetic core portion in the running direction of the magnetic recording medium, and Since the slider member having the wire groove is joined, it becomes easy to wind the coil and pull out the end of the coil, and the flexure can be attached with flexibility. Furthermore, since there is no need to make the magnetic core of the coil winding portion thin, a TI1 head exhibiting excellent magnetic properties can be provided.

Therefore, a short magnetic path winding can be realized, and a magnetic head with good vibration resistance and wear resistance can be provided without changing the position of the adhesive groove on the flexure with respect to the external dimensions. It can be said that the practical value of the invention is extremely high.

[Brief explanation of the drawing]

1 to 3 show an embodiment of a magnetic head to which the present invention is applied, in which FIG. 1 is an exploded perspective view, FIG. 2 is an external perspective view, and FIG. It is a sectional view taken along the A line. FIG. 4 is a perspective view showing a method of manufacturing a magnetic head according to the process according to the present invention, and FIG.
Figure 4 (C) shows the process of grinding the center core, Figure 4 (C) shows the process of joining the erase head block and recording/reproducing head block, Figure 4 (D) shows the process of joining the auxiliary core, and Figure 4 (E) shows the process of slining. Each processing step is shown below. FIG. 5 shows another embodiment of the present invention, and is an external perspective view showing a magnetic head in which auxiliary cores are provided on both sides of the magnetic core portion. FIG. 6 is a sectional view showing a conventional magnetic head. 1...Magnetic core section 2...Erasing head section 5...For recording/reproduction, do section lO...Auxiliary core 20.30...Slider member 40.41 ····coil

Claims (1)

[Scope of Claims] A magnetic head in which a slider member is integrated into a magnetic core portion having a first working gap and a second working gap, wherein a cross section of at least one side of the magnetic core portion in the running direction of a magnetic recording medium is provided. A substantially U-shaped auxiliary core is joined, and a coil winding groove is cut out in the slider member, and the magnetic core is connected to the magnetic core through a gap formed between the magnetic core and the auxiliary core. A magnetic head characterized in that a coil is wound and an end of the coil is pulled out from a coil winding groove of the slider member.