JP3440326B2 - Magnetic head device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device used in a floppy disk device or the like.

[0002]

2. Description of the Related Art In a magnetic recording method in which leakage magnetic flux from a magnetic recording medium is taken into a magnetic head including a coil from an operating gap and a reproducing process is performed, the magnetic flux also flows into a magnetic head core due to an external magnetic field from a motor or a power source. ,
This magnetic flux causes noise and causes an error.

Therefore, in response to such noise generation,
A shield ring (referred to as the shield part) made of a magnetic material such as ferrite or permalloy is provided on the outer periphery of the magnetic head core to guide the magnetic flux from the external magnetic field to the shield ring and prevent the magnetic flux from flowing to the magnetic head core. Various magnetic heads having the above structure have been proposed.

However, in recent years, the magnetic disk device tends to have a higher density and a smaller size, and the magnetic head portion used in the magnetic disk device is also downsized.

3 to 5 show a conventional example. In the conventional example shown in FIG. 3, the slider 1 and the slider 2 together with the core 3 form a sliding surface. The coil 5 is arranged below the slider 1, the slider 2 and the core 3,
At the lower end of the coil 5, a terminal block 8 integrated with the bobbin B (hereinafter,
A bobbin with terminals) is arranged. Then, the lead wire of the coil is connected to the terminal pin of the terminal block 8 (the same as the terminal pin 9 of FIG. 5), and the shield ring 4 is connected to the terminal block 8.
Is arranged on the support member 6 so as to surround the entire coil on both sides including.

In another conventional example shown in FIG. 4,
Similar to the conventional example, the slider 1, the slider 2, the core 3, the coil 5, and the bobbin with the terminal are arranged on the support member 6, and the shield ring 4 surrounding them is disposed on the terminal block 8
Both ends of the shield ring are largely cut out so that the magnetic head part can be miniaturized.

[0007]

However, in a magnetic head device using a bobbin with a terminal, in the case of a shield ring surrounding the entire bobbin with a terminal, the outer shape of the shield ring becomes large, and a floppy disk is loaded in the floppy disk device. There is a risk of contact with the shutter of the floppy disk when inserting or removing, and there is a problem that the magnetic head is damaged or damaged.

Further, in order to make the outer shape of the shield ring small, when the shield of the terminal block portion is cut out,
There is a drawback that an external noise is easily received from the cutout opening and an error is caused.

Further, in the magnetic head device using the bobbin with the terminal, as shown in FIG. 5, when the coil wire 10 is wound from the coil winding portion to the terminal pin 9 provided on the terminal block 8 by an automatic winding machine, Since the coil wire passing over the bobbin passes through the path of the shortest distance to the terminal pin, the position where the coil wire passes cannot be arbitrarily controlled.

The present invention has been made in view of the above problems. Even if a bobbin with a terminal is used in the magnetic head portion, the outer shape of the shield ring does not become large, and the slit portion (opening portion) of the shield ring is not affected by external noise. It is an object of the present invention to provide a magnetic head device that can be controlled to a size not affected by the above and can arbitrarily control the position where the coil wire extending from the coil winding portion to the terminal portion passes.

[0011]

In order to solve the above-mentioned problems, the invention according to the magnetic head device of claim 1 has a magnetic head core, a slider, and a coil winding wound around a bobbin in a shield ring. A terminal block provided with a terminal pin for connecting the ends of the coil winding is integrally formed with the bobbin at one end of an extension portion narrower than the collar width of the bobbin,
Wherein by extension of the bobbin with the same width as the extension to the <br/> slit portion formed in the shield ring is fitted, the terminal block is disposed outside the shield ring, and said terminal block The protrusion is provided on the coil
The winding is entangled with the terminal pin through the protrusion.
It is characterized in that that.

In order to solve the above-mentioned problems, the invention according to claim 2 is the magnetic head device according to claim 1, wherein the projection is a side surface of the terminal block,
In the same direction as the direction in which the long part extends and from the upper surface of the extension part
It is characterized in that one is formed at a lower position .

Alternatively, in order to solve the above problems, the invention according to claim 3 relates to the magnetic head device according to claim 1 or 2, wherein the maximum distance between the terminals is wider than the collar width of the bobbin. It is a feature.

Further, in order to solve the above problems, the invention according to claim 4 is the magnetic head device according to claim 1, 2 or 3, wherein the protrusion is made of the same material as the bobbin. It is a thing. At the time of assembly, the extension part of the collar of the bobbin is fitted into the slit part, so that the coil winding part of the bobbin is housed in the shield ring, and the terminal block is arranged outside the shield ring.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a magnetic head device according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1A is a perspective view of a coil portion using a bobbin with a terminal, and FIG. 1B is a plan view in which the coil wire of FIG. 1A is omitted. The coil wire 10 drawn from the coil 5 of the bobbin B is
It extends toward the terminal block 8 through the extension 11 of the bobbin collar Be provided at the end of the terminal. Here, although the extension is provided near one side of one side surface of the end plate Be in the figure, the position may be arbitrary. Also, bobbin Tsuba Be
The extension 11 and the terminal block 8 are integrally formed.

The width a of the extension 11 of the bobbin B is smaller than the width A of the collar Be of the bobbin, and this width becomes the width of the slit portion (opening) of the shield ring described later. The maximum distance between the terminal block 8 and the terminal pins, that is, the distance between the terminal pins 9a and 9c is wider than the width A of the bobbin collar Be. This means that since the terminal block is arranged outside the shield ring, the terminal interval can be set large without affecting the size of the outer shape of the shield ring.

The terminal block 8 is provided with a protrusion 12 for guiding the coil wire 10. The coil wire 10 extending from the coil 5 is entangled with the terminal pins 9 a to 9 c via the protrusion 12. Then, the protrusion 12
The coil wire 10 is guided to the terminal block 8 without passing over the bobbin extension 11 that is narrower than the collar width A of the bobbin B. Further, by providing the projection 12 at another position of the terminal block 8, the position where the coil wire 10 passes can be arbitrarily changed.

FIG. 2 is a perspective view of a magnetic head device using the bobbin with terminals shown in FIG. 1 (a). The slider 1 and the slider 2 are made of non-magnetic ceramics and form a sliding surface with the magnetic recording medium together with the core 3. The coil 5 is arranged below the slider 1, the slider 2, and the core 3. And the shield ring 4 is arrange | positioned so that each of these parts may be covered.

A slit 13 is formed on the side surface of the shield ring 4.
And the extension portion 11 of the bobbin B is provided with the slit portion 13.
It extends through to the terminal block 8. Bobbin B
The extension portion 11 of the flange Be is fitted into the slit portion 13 to be accommodated in the shield ring 4, and thus the terminal block 8 is arranged outside the shield ring 4. The width of the slit portion 13 can be reduced to the width of the extension portion 11 of the bobbin B, and the influence of external noise can be reduced.

As shown in FIG. 2, the terminal block 8 is arranged outside the shield ring 4, and the terminal pins 9a to 9a of the terminal block 8 are arranged.
c and a predetermined portion of the flexible printed board 7 are soldered. That is, by disposing the terminal block 8 outside the shield ring 4, the outer shape of the shield ring 4 can be reduced, and the risk of contact with the shutter of the floppy disk can be eliminated.

[0022]

According to the first aspect of the invention, even if the bobbin with the terminal is used, the terminal block portion can be arranged outside the shield ring, so that the outer shape of the shield ring can be reduced. In addition, the protrusion provided on the terminal block
The coil wire that passes over the extension of the bobbin by
Since the position of the ear can be controlled, the slip ring of the shield ring
Magnetic field that is strong against external noise
You can get the dead. In addition, the coil due to external factors
Wiring should be performed avoiding the risk of broken wires.
You can also

In the invention according to claim 2, in the invention according to claim 1, the position where the protrusion is provided is specified.
Therefore, it is possible to avoid the location where there is a risk such as the coil wire being broken due to an external factor.

In the invention according to claim 3, in the invention according to claim 1 or 2, since the terminal block is arranged outside the shield ring, the peripheral circuit to be connected regardless of the size of the slit of the shield ring. The terminal pin spacing can be set according to.

Further, in the invention according to claim 4, in the invention according to claim 1, 2 or 3, since the material of the protrusion is the same as that of the bobbin, it can be integrated with the bobbin. It is possible to simplify.

[Brief description of drawings]

FIG. 1 is a diagram showing a coil unit using a bobbin with a terminal according to a magnetic head device of the present invention, FIG.
(B) is a plan view in which the coil wire is omitted.

FIG. 2 is a perspective view showing an embodiment of a magnetic head device of the present invention.

FIG. 3 is a perspective view showing an example of a magnetic head device using a conventional bobbin with terminals.

FIG. 4 is a perspective view showing an example of a magnetic head device using a conventional bobbin with terminals.

FIG. 5 is a perspective view showing an example of a coil portion using a conventional bobbin with a terminal.

[Explanation of symbols]

B bobbin Be Tsuba 1, 2 slider 3 core 4 Shield ring 5 coils 8 terminal block 9a, 9b, 9c Terminal pin 10 coil wire 11 extension 12 protrusions 13 slits

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) G11B 5/10-5/17 G11B 5/265-5/29

Claims (4)

(57) [Claims] 1. A magnetic head core in a shield ring,
A slider and a coil winding wound around a bobbin are provided, and terminal pins for connecting the ends of the coil winding are provided.
The terminal block is integrally formed with the bobbin at one end of an extension portion narrower than the collar width of the bobbin, and has the same width as the extension portion.
By extension of the bobbin into the slit portion formed in Rudoringu is fitted, the terminal block is disposed outside the shield ring and the protrusion to the terminal block is
The coil winding is provided through the protrusion and the terminal
A magnetic head device characterized by being entangled in a pin . 2. The protrusion is a side surface of the terminal block.
In the same direction as the extension extends, and
The magnetic head device according to claim 1, wherein one magnetic head device is formed at a position lower than an upper surface of the portion . 3. The magnetic head device according to claim 1, wherein in the magnetic head, the maximum distance between the terminals is wider than the brim width of the bobbin. 4. The magnetic head device according to claim 1, wherein the protrusion of the magnetic head is made of the same material as that of the bobbin.