JPH04188424A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent the falling-off of a shield ring by installing a connecting terminal assembly, to which the terminal of a coil wound on a magnetic core is connected, to a magnetic head body, bonding a shield member with the terminal holding member of the terminal assembly and mounting the shield member to the magnetic head body. CONSTITUTION:A terminal assembly 30 is manufactured by implanting and holding a fixed number of connecting terminals 30b to a terminal holding member 30a, and each of the coil terminals 10a, 13a of coils 10, 13 is bonded with each of the terminals 30b. A groove 8e for fitting and fixing the terminal assembly 30 is formed inside a column section 8d formed on a joint surface 8a joined with the core assembly 1 of a slider 8. A magnetic head body 18 is inserted into a shield ring 22, and the end section 30c of the terminal holding member 30a is elastically deformed and an end section 30c is press-fitted into a notch section 22a, thus engaging the shield ring 22 and bonding the shield ring with the end section 30c. Accordingly, the falling-off of a shield member can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic head that performs magnetic recording or reproduction of information by bringing a magnetic core into sliding contact with a magnetic recording medium, and particularly relates to a magnetic head that magnetically records or reproduces information by bringing a magnetic core into sliding contact with a magnetic recording medium. The present invention relates to a magnetic head held between sliders that make sliding contact with a magnetic recording medium.

[Prior Art] This type of magnetic head is an FDD that magnetically records or reproduces information on a flexible magnetic disk (disk-shaped magnetic recording medium) called a floppy disk.
There is a magnetic head used in (floppy disk drive devices). The structure of a conventional magnetic head for FDD will be explained with reference to FIGS. 8 to 11.

First, FIG. 8 shows the structure of the magnetic head main body. In the figure, reference numeral 1 denotes a core assembly, which includes a magnetic core 2 for recording and reproducing (hereinafter referred to as a recording and reproducing core) and a magnetic core for erasing that performs so-called tunnel erasing, which erases both ends of a recording track (hereinafter referred to as a recording and reproducing core). It is constructed as a combined body in which front core portions of 4 (referred to as erasing cores) are joined via a spacing plate 6.

The recording/reproducing core 2 has a T-shaped first front core 2a and a single-shaped second front core 2b joined via a recording/reproducing gap 3, and further magnetically attaches these to the rear ends of the cores 2a, 2b. Back core 1, which is the third core connected to
5 are joined together.

In addition, the erasing core 4 similarly joins a T-shaped first front core 4a and a T-shaped second front core 4b via an erasing gap 5.5', and further includes a rear end portion of the cores 4a, 4b. A back core 16, which is a third core, is joined to the back core 16.

However, before joining the respective back cores 15.16, the recording/reproducing core 2 and the erasing core 4 are connected to each other via a spacing plate 6 as a core assembly 1, and non-magnetic sliders 7.8 are attached with adhesive on both sides. Alternatively, they are joined by glass welding or the like, and the core assembly 1 is sandwiched therebetween.

The slider 7.8 slides into contact with a magnetic disk (not shown) together with both cores 2.4, so that the slider 7.8 and both cores 2.4 slide against the magnetic disk.
It stabilizes the sliding contact between the cores 2.4 and reinforces both cores 2.4, and is made of ceramics or the like. Further, the slider 7.8 has notches 7b and 8b, and is formed in a block shape with an L-shaped cross section. The protruding surfaces of the upper end of the core assembly 1 are used as joint surfaces 7a and 8a to be joined to both sides of the upper end of the core assembly 1 by adhesive or glass welding.

After this joining, a coil bobbin 9 around which a recording/reproducing coil 10 is wound and a coil bobbin 12 around an erasing coil 13 are fitted into each of the front cores 2a, 4a of the core assembly 1, and the front cores 2a, 4a are fitted into the front cores 2a, 4a.
Back cores 15 and 16 are bonded to the rear end portions of the magnetic heads b, 4a, and 4b via the spacing plate 17, thereby forming a magnetic head body shown at 18 in FIG.

Note that the above-mentioned coil bobbins 9 and 12 have holes 9a and 12, respectively.
A coil l0113 is installed at both ends of the rectangular cylindrical main body having 12a.
It has a structure in which flanges 9b and 12b are formed to regulate the winding width.

Next, FIG. 9 is a perspective view of the front side of the entire magnetic head facing the magnetic disk, and FIG. 10 is a perspective view of the back side of the entire magnetic head. As shown in both figures, the magnetic head main body 18 is positioned and fixed at a predetermined position on a support plate 19 made of stainless steel or phosphor bronze, a flexible printed circuit board 20 for leading out an external circuit is connected to the support plate 19, and the coil The magnetic head 21 is constructed by connecting each of the terminals 10a and 13a of the 10113 to the connecting portion 20a of the printed circuit board 20.

Furthermore, as shown in FIG. 11, a rectangular cylindrical shield ring 22 surrounding the magnetic head main body 18 is attached to the magnetic head 21. As shown in FIG.

The magnetic head 21 is attached by fixing the support plate 19 on a helad carriage in an FDD (not shown), and slides on the rotating magnetic disk using the upper surface of the magnetic head main body 18 in FIG. 9 as a sliding surface. Record and playback by touching the device.

The shield ring 22 is a D
A shielding member that shields the magnetic head main body 18 from external noise such as noise due to leakage magnetic flux from permanent magnets such as D-Momo, and high frequency noise generated from a nearby display when the FDD is incorporated into a system. It is made of a high magnetic permeability material such as permalloy, a high conductivity material such as aluminum or copper, or a combination thereof.

In recent years, the miniaturization of disk drive devices has been promoted, and various noise sources are placed close to the magnetic head 21, so the shield ring 22 has become essential.

[Problems to be Solved by the Invention] However, in the conventional FDD magnetic head described above, the coil terminal 10a is connected to the connection portion 20a of the printed circuit board 20.
Each of the X 13a is connected by soldering, but at that time it is a troublesome work to align the coil terminals 10a, 13a with the connection part 20a, and it takes a considerable amount of work time to solder. It takes. If heat is applied to the connection part 20a for a long time, the connection part 20a will peel off, so this soldering process is a very difficult process.In order to simplify the manufacturing process of the magnetic head, It was a hindrance.

Furthermore, the shield ring 22 is fixed to the magnetic head 21 by adhering it to a support plate 19, but as FDDs have become smaller in recent years, the support plate 19 has also needed to be made smaller. Space is running low. For this reason, if the adhesive cannot be applied sufficiently and the adhesive strength decreases due to aging, the shield ring 22 may fall off due to vibrations or shocks caused by the FDD's spacing seek operation, etc. There are cases where this happens.

Furthermore, if the shield ring 22 is made of a magnetic material such as permalloy, it must be positioned and installed so that it has a predetermined gap with the magnetic head body 18, and this work is also troublesome and takes time. This was an obstacle to simplifying the manufacturing process.

Therefore, an object of the present invention is to provide a magnetic head of this type.
In order to solve the above-mentioned problems, according to the present invention, the magnetic core can be connected with the magnetic core together with the magnetic core. In a magnetic head held between sliders that make sliding contact with a recording medium, a terminal assembly is provided in the magnetic head main body, in which a terminal holding member is implanted with a connecting terminal to which an end of a coil wound around the magnetic core is connected. A structure is adopted in which a shielding member is provided to shield the magnetic head main body from external noise and is coupled to a terminal holding member of the terminal assembly and attached to the magnetic head main body.

[Operations] According to such a structure, the coil terminal is connected to the connection terminal of the terminal assembly, so the connection work becomes easy. Furthermore, if the connection between the terminal holding member and the shield member is made strong, it is possible to prevent the shield member from falling off.

[Example] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

In each figure of the following embodiment, parts common or corresponding to those in FIGS. 8 to 11 of the conventional example are denoted by the same reference numerals, and a description of the common parts will be omitted.

First Embodiment FIGS. 1 to 3 explain the structure of a magnetic head for FDD according to a first embodiment of the present invention. First, FIG. 1 is an exploded perspective view showing the structure of the magnetic head main body. .

As shown in FIG. 1, this embodiment differs from the conventional one in that a terminal assembly 3 is included in the constituent members of the magnetic head body.
0 is used. The terminal assembly 30 includes a terminal holding member 30a made of an insulating material and a predetermined number (5 in this case) of connecting terminals 30b implanted and held therein.
Coil terminals 10a and 13a of coils 10 and 13 are respectively connected to terminal 30b. Note that both end portions 30c of the terminal holding member 30a are formed in a cylindrical shape to engage the shield ring 22 as described later, and the intermediate portion is formed in a prismatic shape.

Also, as a difference from the conventional example, a pillar part 8d is formed on the slider 8 so that the joint surface 8a to be joined to the core assembly 1 of the slider 8 is T-shaped, and the terminal assembly 30 is placed inside the pillar part 8d. A groove 8e for fitting and fixing is formed.

In assembling the magnetic head body, the sliders 7.8 are joined to both sides of the core assembly 1 as in the conventional example, the coil bobbin 9.12 is fitted into the front core 2a14a, and the back core 15.16 is attached to the core assembly 1.
The terminal assembly 30 is joined to the rear end portion, and the terminal assembly 30 is fitted into the groove 8e of the slider 8 and fixed by adhesive or the like. Further fixed terminal assembly 3
The coil terminals 10a and 13a of the coil 10.13 are wound around and connected to each of the connection terminals 30b of the coil 10.0.

In this way, the magnetic head main body 18 shown in FIG. 2 is constructed. The ends 30c of the terminal holding members 30a of the terminal assembly 30 are located on both the left and right sides in FIG. 2 of the magnetic head main body 18.
is becoming more prominent.

On the other hand, as shown in FIG.
A cutout portion 22a is formed at each portion corresponding to the end portion 30c. The notch portion 22a is substantially rectangular, and a triangularly protruding engaging portion 22b is formed on one side thereof. The distance between the top of the engaging portion 22b and the side surface of the notch 22a facing it is determined by the terminal assembly 3.
It is formed to have a dimension slightly smaller than the diameter of the end portion 30c of 0.

Note that the shield ring 22 and the terminal holding member 30a are small (
It is assumed that one of the two has a certain degree of elasticity.

Then, the magnetic head main body 18 is inserted into the shield ring 22 in the direction of the arrow in FIG.
0c is press-fitted into the notch 22a, the end 30c gets over the engaging part 22b, and the engaging part 22b engages with the end 30c, whereby the shield ring 22 is locked and the end 3
0c, and a shield ring 22 is attached to the magnetic head main body 18 as shown in FIG.

The magnetic head main body 18 with the shield ring 22 attached in this manner is fixed to the support plate 19 of the conventional example shown in FIGS. 9 to 11, and the flexible printed circuit board 20 is further connected to form a magnetic head. . Although not shown, each of the connection terminals 30b of the terminal assembly 30 is soldered to the lead wire pattern of the printed circuit board 20, so that each of the coil terminals 10a, 13a is connected to the lead wire pattern of the circuit board 20.

According to this embodiment as described above, the coil terminals 10a,...
13a can be easily connected by wrapping the terminals 10a, 1-3a around the terminal 30b of the terminal assembly 30 and soldering the terminal 30b to the printed circuit board 20.

This is because the distance between the terminals 30b can be increased and positioning of the coil terminals is not required.

Further, according to this embodiment, the shield ring 22 can be easily attached by simply press-fitting it as described above. Therefore, the manufacturing process of the magnetic head can be simplified and costs can be reduced.

Furthermore, according to this embodiment, when the shield ring 22 is attached to the magnetic head main body 18, the engaging portion 2 of the ring 22
Since the terminal assembly 2b is structured to prevent the end portion 30c of the terminal assembly 30 from being removed, the coupling between the shield ring 22 and the end portion 30c is strong, and the shield ring 22 can be reliably prevented from falling off.

Note that the shield ring 22 may be attached to the magnetic head body 18 after the magnetic head body 18 is fixed to the support plate 19 and the printed circuit board 20 is connected.

Further, the shield ring 22 attached to the magnetic head body 18 may be further bonded to the magnetic head body 18 and the support plate 19. In this case, the purpose of adhesion is mainly to shield ring 2.
For example, the terminal assembly 30
At least one of the joint portion between the end portion 30c and the shield ring 22 and the contact portion between the shield ring 22 and the support plate 19
Simply applying the adhesive to just a few locations is sufficient, and there is no need to worry about the amount of adhesive or the space for adhesion.

Other Embodiments By the way, the coupling structure of the shield ring 22 and the terminal assembly 30 for coupling the shield ring 22 to the terminal holding member 30a of the terminal assembly 30 and attaching it to the magnetic head body 18 is not limited to the above-mentioned one. figure~
The structure shown in FIG. 7 as another embodiment may be adopted. The structure will be explained below.

FIGS. 4(A) and 4(B) show the cross-sectional shape of the end 30c of the terminal holding member 30a of the terminal assembly 30 (terminal holding member 3
An example is shown in which the shape of the cross section perpendicular to the longitudinal direction of the shield ring 22 is rectangular, and the shape of the notch 22a of the shield ring 22 is different.

In the example of FIG. 4(A), the notch 22a is approximately rectangular,
A convex portion 22b projecting in a chevron shape is formed on one side. The width of the cutout portion 22a at the convex portion 22b is the width of the end portion 30c.
is slightly smaller than the width of With such a structure, the end 30c of the terminal assembly 30 or the shield ring 22 is elastically deformed to form the end 30c into the notch 22a.
By press-fitting, the protrusion 22b bites into the end 30c, and the shield ring 22 is firmly connected to the end 30c and attached to the magnetic head main body.

In the example shown in FIG. 4(B), the notch 22a has an oval shape, and a chevron-shaped convex portion 22c is formed on the lower side of the back of the notch 22a. The vertical width of the notch 22a at the convex portion 22c is slightly smaller than the end 30c. With this structure, the end 3 of the terminal assembly 30
0c into the notch 22a upwardly and then press-fitted rightward, the protrusion 22c becomes the end 30c.
The shield ring 22 is firmly connected and attached to the end portion 30c by biting into the end portion 30c.

Next, FIGS. 5A and 5B show an example in which the notch 22a of the shield ring 22 has the same rectangular shape, but the end 30c of the terminal assembly 30 has a different cross-sectional shape.

In the example shown in FIG. 5(A), the cross section of the end portion 30c is trapezoidal, with the right side being vertical and the left side being inclined, and having a protruding convex portion 30d. The width of the notch 30c is slightly larger than the width of the notch 22a. Then, by elastically deforming the shield ring 22 or the end 30c and press-fitting the end 30c into the notch 22a, the protrusion 30d bites into the edge of the notch 22a, and the shield ring 22 is attached to the terminal assembly 30. and is attached to the magnetic head body.

In the example shown in FIG. 5(B), the end portion 30c has a triangular groove 30e and has an inverted V-shaped cross section, making it easy to elastically deform. The maximum width of the end portion 30c, that is, the left and right convex portions 30d
The width at the notch portion 22g is slightly larger than the width at the notch portion 22g. With this structure, by elastically deforming the end portion 30c and press-fitting it into the notch portion 22a, the convex portion 3
0d bites into the edge of the notch 22a, and the shield ring 22 is firmly connected to the terminal assembly 30 and attached to the magnetic head main body.

4 (A), (B) and 5 (A) as above,
In any of the embodiments (E), the shield ring 22 can be easily and reliably attached to the magnetic head body as in the first embodiment, and the shield ring 22 can be reliably prevented from falling off. It goes without saying that the shapes of the end portion 30c and the notch portion 22a are not limited to the above example.

Next, FIGS. 6 and 7 show further different embodiments.

In this embodiment, as shown in FIG. 6, the entire terminal holding member 30a of the terminal assembly 30 is formed into a prismatic shape, and rectangular grooves 30f are formed on the lower side of both ends 30c. Reference numeral 30g indicates the outer edge of the groove 30f.

Further, as shown in FIG. 7(A), a rectangular notch 22a is formed in the shield ring 22, and its width is equal to that of the end 30.
Corresponds to c.

Then, as shown in FIGS. 7(A) and 7(B), the end 30c is press-fitted into the notch 22a, the lower edge of the notch 22a enters the groove 30f, and the edge 30g engages the shield ring 22. By fitting together, the shield ring 22 is firmly coupled and attached to the terminal holding member 30a.

With this structure, the shield ring 22 can be easily and reliably attached to the magnetic head main body, and the shield ring 22 can be prevented from falling off, as in the previous embodiments. Moreover, as shown in FIG. 7(B), the shield ring 22 is attached by fitting into the groove 30f protruding from the side surface of the slider 8, that is, the side surface of the magnetic head main body.
It is easy to position the shield ring 22 so that there is a predetermined gap between the shield ring 22 and the magnetic head body.

[Effects of the Invention] As explained above, according to the magnetic head of the present invention, in the magnetic head in which the magnetic core is held between sliders that come into sliding contact with the magnetic recording medium together with the core, the magnetic core is wound around the magnetic core. A terminal assembly is provided in the magnetic head main body, and a terminal assembly is provided in the magnetic head main body, and the terminal assembly includes a connecting terminal to which the terminal of the coil is connected, which is implanted in a terminal holding member, and a shielding member that shields the magnetic head main body from external noise is attached to the terminal holding member of the terminal assembly. By adopting a structure in which the magnetic head is connected to a member and attached to the magnetic head body, it is possible to connect the coil terminal and attach the shield member easily and reliably, simplifying the manufacturing process of the magnetic head and reducing costs. At the same time, an excellent effect can be obtained in that the reliability of the magnetic head can be improved by preventing the shield member from falling off.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the structure of the main body of an FDD magnetic head according to the first embodiment of the present invention, FIG. 2 is a perspective view of the magnetic head main body and a shield ring, and FIG. 3 is a perspective view of the magnetic head main body. Perspective view with shield ring attached, 4th
Figures (A) and (B) and Figures 5 (A) and (B) are front views of the joint portion showing the joint structure of the terminal holding member and the shield ring of the terminal assembly according to different embodiments, respectively;
The figure is a perspective view of a terminal assembly according to a different embodiment, FIG. 7(A) is an explanatory diagram showing the coupling structure of the terminal assembly and a shield ring according to the same embodiment, and FIG. 7(B) is the same as FIG. 7(A). 8 is an exploded perspective view showing the structure of the main body of a conventional FDD magnetic head, and FIGS. 9 and 1O are the front side and the assembled state of the same magnetic head. A perspective view of the back side, and FIG. 11 is a perspective view of the same magnetic head with a shield ring attached. 1...Core assembly 2...Recording/reproducing core 4...Erasing core 7.8...
Slider 9.12...Coil bobbin 10.13...
- Coils 10a, 13a...Coil terminals 15.16...Back core 18...Magnetic head body 19...Support plate 2o...
Printed circuit board 22...Shield ring 30...Terminal assembly 30a...Terminal holding member 30b...Connection terminals-1 and 2a Perspective view of the magnetic head main body with the shield ring attached Fig. 3 Front view of the shield ring joint part Fig. 3 Figure 4: Front view of the shield ring coupling part Figure 5: L --------------------= Explanatory diagram of the shield ring coupling structure Figure 7 (A) Exploded perspective view of the conventional magnetic head main body Figure 8: Conventional magnetic head Figure 9 is a perspective view of the front side of the magnetic head. Figure 10 is a perspective view of the back side of a conventional magnetic head.

Claims (1)

[Claims] 1) In a magnetic head in which a magnetic core is held between sliders that make sliding contact with the magnetic recording medium together with the core, a connection terminal to which an end of a coil wound around the magnetic core is connected is provided. A terminal assembly embedded in the terminal holding member is provided on the magnetic head main body, and a shielding member for shielding the magnetic head main body from external noise is coupled to the terminal holding member of the terminal assembly and attached to the magnetic head main body. A magnetic head characterized by: 2) The magnetic head according to claim 1, wherein the terminal assembly is fitted and fixed to the slider.