JPH0194511A - Magnetic head - Google Patents

Abstract

PURPOSE:To lower the manufacturing costs of the magnetic head and to improve and equalize its various characteristics by pressing the edge part of a third core on a first core side with an inclined surface provided at the internal side surface of a transparent hole, and press-fitting and holding the third core with the said first core and a second core. CONSTITUTION:The top of the internal side surface of transparent holes 15c and 25c at a left edge part in a figure is formed as inclined surfaces 15d and 25d, which spread upward in an external direction. Further, third cores 13 and 23 are fixed by press-fitting respective edge parts 13a and 23a to the respective transparent holes 15c and 25c of coil bobbins 15 and 25, press-contacting and holding the third cores 13 and 23 to respective first and second cores 11, 21, 12 and 22 with the pressing of the indlined surfaces 15d and 25d, and then bonding them. Thus, the magnetic head can be simply and inexpensively manufactured with small mandays, and the various characteristics of the magnetic head element main body can be improved and equalized.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnetic head for magnetically recording, reproducing, or erasing information on a magnetic recording medium, and particularly relates to a first core into which a coil bobbin is fitted; The present invention relates to a magnetic head having a magnetic circuit including a second core joined to the first core through a magnetic gap, and a third core fixed in pressure contact with the ends of the first and second cores. It is something.

[Prior Art] As a magnetic head of this type, a magnetic head used in a floppy disk drive (hereinafter referred to as FDD) that records and reproduces information on a flexible magnetic disk of a magnetic recording medium, a so-called floppy disk, is known. . FIG. 4 shows a typical structure of a magnetic head element body composed of a magnetic circuit and a coil bobbin of a conventional magnetic head for FDD.

As shown in the figure, this magnetic head element main body includes a first magnetic circuit 1 having a recording and reproducing gap G1 for recording and reproducing as a magnetic gap, and a second magnetic circuit 2 having an erase gap G2 for erasing. It has

The first magnetic circuit 1 includes first to third cores 11 to 13 each made of a high permeability magnetic material.

The first core 11 is formed into a T-shape, and a coil bobbin 15 shown in FIG. 345 is fitted therein.

The coil bobbin 15 has collar portions 15b, 1 at both ends of a cylindrical portion 15a having a through hole 15c into which the first core 11 is fitted.
5b is formed.

A coil 14 is wound around the cylindrical portion 15a.

Further, the second core 12 is formed into a straight and elongated prismatic shape,
It is butted against and joined to the first core 11 via the recording/reproducing gap G1. Further, the third core 13 is formed into a straight short prismatic shape, and both ends thereof are connected to the first and second cores 1.
1. Press adhesive 27 onto each of the rear ends of 12.
The first and second cores 11 and 12 are fixed by adhesion, bridging the first and second cores 11 and 12 and magnetically connecting them.

On the other hand, the second magnetic circuit 2 similarly includes the first to third cores 21 to
It consists of 23. A coil bobbin 25 wound with a coil 24 similar to the coil bobbin 15 is fitted into the T-shaped first core 21 . Further, the elongated prismatic second core 22 is joined to the first core 21 via the erase gap G2. Further, both ends of the short prismatic third core 23 are pressed onto the respective rear ends of the first and second cores 21 and 22, and fixed by adhesive 27.

Note that each of the third cores 13, 23 is integrated with a spacing plate 26 made of a non-magnetic material sandwiched therebetween, and is fixed together in this state.

Both magnetic circuits 1.2 are joined by butting their respective second cores 12.22 across the spacing plate 3 made of a non-magnetic material, and the recording/reproducing gap G1 and the erasing gap G2 are connected to the spacing plate 3 and the second core 1.2. They are configured to be adjacent to each other with the cores 12 and 22 in between.

Based on this structure, information is magnetically recorded or reproduced on a floppy disk (not shown) that slides in the direction of arrow A in FIG.

[Problems to be Solved by the Invention] By the way, in the above structure, the third core 13.23 is fixed by integrating both cores 13.23 and fixing them to the first and second cores 11, respectively. .12, 21.22, and is bonded with an adhesive 27.

However, each of the third cores 13.23
It is extremely difficult to apply pressure uniformly to each of the cores 11, 12, 21, and 22 of the cores 11, 12, 21, and 22 to bond them in a state in which they are in pressure contact with each other without gaps, and requires a large number of man-hours. A gap was likely to occur between the third core and the first and second cores. If a gap is generated, magnetic flux leaks through the gap, external noise is easily picked up, etc., and various characteristics of the magnetic head element body are adversely affected. There is a problem in that various characteristics of the magnetic head element main body deteriorate and variations occur in the various characteristics.

[Means for Solving the Problems] In order to solve these problems, the present invention provides a first core to which a coil bobbin is fitted, and a first core joined to the first core through a magnetic gap. In a magnetic head having a magnetic circuit including a second core and a third core fixed in pressure contact with end portions of the first and second cores, the third core is connected to the first core. The end on the side to be fixed is the first
is inserted into the through hole of the coil bobbin into which the core is fitted, overlapping the first core, and is pressed toward the first core by an inclined surface provided on the inner surface of the through hole, and as a result of this pressing, the third
A structure is adopted in which the core is held in pressure contact with the first and second cores.

[Function] According to this structure, the third core can press the inclined surface by simply inserting its end into the through hole of the coil bobbin into which the first core is fitted, overlapping the first core. It is held in pressure contact with the first and second cores, and fixed in this state by, for example, adhesive. During this fixation, the third core is held stably, so there is no looseness, and the first
Also, no gap is generated at the joint with the second core.

[Embodiment] Details of embodiments of the present invention will be explained below with reference to FIGS. 1 to 3. Here, the above-described magnetic head for FDD is used as an example, and in FIGS. 1 to 3, the same or corresponding parts as in FIGS. 4 and 5 of the conventional example are given the same reference numerals.

FIG. 1 shows the structure of the magnetic head element body of the magnetic head according to this embodiment. As shown in the figure, the basic structure of the magnetic head element main body of this embodiment is the same as that of the prior art example described above. That is, the magnetic head element main body includes a first magnetic circuit 1 having a recording/reproducing gap G1 and an erasing gap G2.
It is composed of a second magnetic circuit 2 having a. The first magnetic circuit 1 includes a first core 11 fitted with a coil bobbin 15 similar to the conventional example, a second core 12 joined to this core 11 via a recording/reproducing gap G1, and a first The third core 13 is fixed to each end of the two cores 11 and 12 in pressure contact with each other. Further, the second magnetic circuit 2 includes a first core 2 fitted with a coil bobbin 25.
1, a second core 22 joined to this core 21 through an erasure gap G2, and a third core 23 fixed in pressure contact with the respective rear ends of the first and second cores 21 and 22. It consists of

Then, the remagnetization circuit 1.2 is joined by butting the respective second cores 12.22 with the spacing plate 3 made of a non-magnetic material in between, as in the case of the conventional example described above, and the recording/reproducing gap G1 and the erasing gap G2 is configured to be adjacent to each other with the spacing plate 3 and the second core 12.22 in between.

As described above, the basic structure of the magnetic head element main body of this embodiment is the same as that of the conventional example, but the following points are different from the conventional example.

That is, each of the third cores 13.23 has an end 13a fixed to each of the first cores 11.21, as shown in FIG.

23a is bent at a substantially right angle, forming a 5-shape as a whole.

Also, as shown in Fig. 3, the first coil bobbin 15°25
The inner height Hl of each of the through holes 15c and 25c into which the cores 11 to 21 are fitted is formed larger than before,
It is formed slightly smaller than the sum of the thicknesses of the first and third cores 11.degree.13 to 21.23.

The upper surfaces of the inner surfaces of the left end portions of the through holes 15c and 25c in FIG. 3 are formed as inclined surfaces 15d and 25d that are inclined outwardly and upwardly. Inclined surface 15d
, 25d are provided in the through hole 15c.

The inner height H2 of the end of 25c is the height H2 of the first and third cores 11.
It is slightly larger than the sum of the respective thicknesses of 13 to 21.23.

As shown in FIG. 2, the third cores 13.23 are integrated into a U-shape with the spacer plate 26 in between, and in this state, the respective ends 13a.

23a is shown in FIGS. 1 and 3 through each through hole 15c of the coil bobbin 15.25.

25c on the side where the inclined surfaces 15d and 25d are provided
The cores 11 to 21 of This insertion is performed at the inner heights Hl and H2 of the through holes 15c and 25c described above.
The end portions 13a, 23a depending on the dimensional relationship between
is the inclined surface 15d.

Since it comes into contact with 25d, it is a press fit. and end portion 13a,
By press-fitting 23a, the end portions 13a, 23a are connected to the first core if in the lower part of FIG. 3 by the inclined surfaces 15d, 25d.
, 21 side. This allows the third core 13.2
3 is held in pressure contact with the rear end portions of each of the first and second cores 11, 12, 21.22. The third core 13.23 is thus held in pressure contact and fixed to the first and second cores by adhesion with an adhesive 27, as shown in FIG.

According to this embodiment, the third core 13° 23 is fixed by attaching the respective ends 13a and 23a to the coil bobbin 1.
Press fit into the respective through holes 15c and 25c of 5.25 to form the inclined surface 15d.

By pressing 25d, the third core 13.23 is connected to the first and second cores.
The cores 11, 12, 21, and 22 may be bonded while being pressed and held, and this can be done extremely easily and inexpensively with a small number of man-hours. Also the third core 13.23
When bonding, both cores 13.23 are held in pressure contact with the first and second cores it, 12, 21.22 as described above, and the bonding can be carried out without wobbling. , there is no gap between the first and second cores, and therefore the above-mentioned negative effects on the characteristics of the magnetic head element main body due to this gap can be avoided, thereby improving the various characteristics of the magnetic head element main body. It is possible to achieve uniformity at the same time.

[Effects of the Invention] As is clear from the above description, according to the present invention, the coil bobbin is fitted into the first part! A magnetic circuit consisting of a core, a second core joined to the first core through a magnetic gap, and a third core fixed to the ends of the first and second cores by pressure contact. In the magnetic head, a side end portion of the third core fixed to the first core is inserted into a through hole of the coil bobbin into which the first core is fitted, overlapping the first core. and is pressed toward the first core by an inclined surface provided on the inner surface of the through hole, and the third core is held in pressure contact with the first and second cores due to the pressing. By adopting
The core can be fixed in pressure contact with the first and second cores without any gaps, and excellent effects can be obtained in that the manufacturing cost of the magnetic head can be reduced and various characteristics can be improved and made uniform.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the structure of a magnetic head element main body of a magnetic head according to an embodiment of the present invention, and FIG.
FIG. 3 is a cross-sectional view of the coil bobbin portion in FIG. 1, FIG. 4 is a perspective view showing the structure of the magnetic head element body of a conventional magnetic head, and FIG. It is a perspective view showing the structure of the coil bobbin in the figure. 1.2... Magnetic circuit 11.21... First core 12.22... Second core 13.23... Third core 13a, 23a... End portion 14.24. ...Coil 15.25...Coil bobbin 15c, 25c...Through hole 15d, 25d-...Slanted surface 27...Adhesive

Claims (1)

[Claims] a first core to which a coil bobbin is fitted, a second core joined to the first core through a magnetic gap, and a second core fixed to the ends of the first and second cores by pressure contact. In the magnetic head having a magnetic circuit including three cores, the end of the third core on the side fixed to the first core is inserted into the through hole of the coil bobbin into which the first core is fitted. The third core is inserted overlappingly with the core and is pressed toward the first core by an inclined surface provided on the inner surface of the through hole, and the third core is pressed against the first and second cores by the pressing. A magnetic head characterized in that it is held.