JPH0611104U - Magnetic head - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a magnetic head mounted in a magnetic recording / reproducing apparatus such as a floppy disk apparatus, and an object thereof is to improve the shielding property and the assembling property. [Structure] Magnetic gaps 16 and 17 and coils 19 and 20
Is provided, a slider portion 14 that holds the magnetic head portion 13 and maintains a predetermined sliding contact state with a recording medium, and external inductive noise from entering the magnetic head portion 13. A magnetic head provided with a shield member 15 for preventing the shield member 1
5 is formed of a magnetic ferrite block,
The magnetic head unit 1 is provided at a predetermined position on the shield member 15.
A through hole 25 having a size that can accommodate 5 is formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic head, and more particularly to a magnetic head suitable for use in a magnetic recording / reproducing device such as a floppy disk device.

[0002]

[Prior art]

 Generally, a magnetic head used in a magnetic recording / reproducing apparatus for recording / reproducing on / from a magnetic disk has a combined head structure of a recording head and a reproducing head or a recording / reproducing head and an erasing head. Conventional examples of this type of magnetic head are shown in FIGS. 6 shows a perspective view of the magnetic head 1, FIG. 7 shows an exploded perspective view of the magnetic head 1, and FIG. 8 shows a state in which a shield material 2 is provided on the magnetic head 1 to reduce externally induced noise.

The magnetic head 1 is generally composed of a magnetic head portion 3, a slider 4 and the like. The magnetic head unit 3 is composed of a magnetic core 9 in which coils 5 and 6 are attached and magnetic gaps 7 and 8 are formed, and a bridge bar 10 for closing the magnetic core 9 like a magnetic circuit. . On the other hand, the slider 4 is composed of slider halves 4a and 4b made of a non-magnetic material (for example, ceramic) having a substantially L-shaped cross section.

To assemble the above-mentioned components, the slider halves 4a and 4b are bonded and adhered to the magnetic core 9 using epoxy resin or glass, and then the sliding contact surface 11 facing the magnetic disk is polished. Next, the coils 5 and 6 forming the magnetic circuit are attached to the magnetic core 9, and the bridge bar 10 forming the magnetic path is attached to obtain the magnetic head 1 shown in FIG. The shield material 2 is attached after the magnetic head 1 is formed.

[0005]

[Problems to be solved by the device]

 However, in the conventional magnetic head 1 described above, the shield material 2 has a ring shape made of, for example, permalloy, but the thickness dimension of the shield material 2 is selected thin in order to miniaturize the magnetic head 1. However, there is a problem that a sufficient shielding effect cannot be achieved.

Further, as a method of attaching the magnetic head 1 to a polishing machine in the step of polishing the sliding contact surface 11, a method of adhering with hot-melt type wax or mechanical chucking can be considered. However, the former method requires the wax to be washed after processing, and the latter method requires a jig, which makes it impossible to use the chucking method using magnetic force, which is easy to handle. .

The present invention has been made in view of the above points, and an object of the present invention is to provide a magnetic head having improved shieldability and assemblability.

[0008]

[Means for Solving the Problems]

 In order to solve the above problems, the present invention provides a magnetic head part having a magnetic gap and a coil, a slider for holding the magnetic head part and maintaining a predetermined sliding contact state with a recording medium, In a magnetic head comprising a magnetic head and a shield member for preventing intrusion of externally induced noise, the shield member is formed of a magnetic ferrite block, and the shield member is provided at a predetermined position of the shield member. It is characterized in that a through hole is formed having a size that can accommodate the magnetic head portion.

[0009]

[Action]

 According to the magnetic head configured as described above, since the shield member is made of magnetic ferrite, the shield member is attracted to the magnet, and the shield member has a through hole having a size large enough to accommodate a coil or the like. Therefore, the area viewed from the sliding contact surface (the area of the surface on which the slider is disposed) is large, and when magnet chucking is performed, a strong fixing force (chucking force) can be obtained. Therefore, when the magnetic head is mounted on the processing machine, it is possible to use the magnet chucking as a fixing method, which facilitates the mounting work and eliminates the mounting jig.

Further, since the magnetic head portion and the coil are surrounded by the block-shaped shield member, and the through hole is large enough to accommodate the magnetic head portion, the thickness of the shield member is small. This makes it possible to reliably shield against external induction noise.

[0011]

【Example】

 Next, an embodiment of the magnetic head according to the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a magnetic head 12 according to the present invention, and FIG. 2 is an exploded perspective view of the magnetic head 12. The magnetic head 12 is generally composed of a magnetic head portion 13, a slider portion 14, a shield portion 15 and the like.

The magnetic head unit 13 has a well-known structure. The magnetic core 18 is provided with the magnetic gaps 16 and 17, and the coils 19 and 20 that form a magnetic circuit and the bridge bar 21 that forms a closed magnetic circuit. It is composed of and. One of the magnetic gaps 16 and 17 functions as a recording / reproducing magnetic gap, and the other functions as an erasing head. That is, the magnetic head portion 13 has a composite structure.

The slider portion 14 is made of a non-magnetic ceramic material, and is formed by cutting a plate-like body having a simple structure having a size of 5 mm × 6 mm × 1 mm into a predetermined shape. Although FIG. 2 shows a state in which the slider portion 14 is divided into two parts to form slider portion halves 14a and 14b, the corners are R-polished, the air groove 23 and the magnetic head portion 13 are attached. The groove 24 is formed after the unprocessed ceramic plate is attached to the shield portion 15.

Specifically, after placing a ceramic plate of a predetermined shape on the upper surface of the shield part 15 with epoxy resin and adhering it, the mounting groove 24 and the air groove 23 are processed at the same time, and then each corner is rounded by R. And the slider portion 14 is formed. Due to the formation of the mounting groove 24, the slider portion 14 is substantially divided into the slider portion halves 14a and 14b. Since the slider portion 14 is processed and formed after the flat ceramic plate is placed on the flat upper surface 15b of the shield portion 15 and adhered thereto, it is relatively easy for a ceramic plate having a large hardness. Can be processed. Moreover, since the flat plate-shaped ceramic plate can be used as it is, the processing can be facilitated also by this.

The shield portion 15 is made of a sintered ferrite material having a soft magnetic property, and is formed into a shape shown in FIGS. 1 and 2 by performing sintering using a mold. The shield portion 15 has a structure in which a vertically parallel through hole 25 is provided in a rectangular parallelepiped main body portion 15a. As shown in FIGS. 2 and 3, the size of the through hole 25 is such that the magnetic head portion 13 including the magnetic core 18, the bridge bar 21 and the like and the coils 19 and 20 can be housed. It is supposed to be large. Further, the sintered ferrite material forming the shield portion 15 is easy to mold and easy to manufacture using a mold, and can be manufactured at low cost. Further, since the shield portion 15 is made of a sintered ferrite material which is a soft magnetic material, it is possible to exert a shield effect. In the molding process of the shield part 15, the main body upper surface part 15b to which the slider part 14 is adhered is highly accurately polished.

A method of assembling each of the above components will be described below. First, as described above, a flat ceramic plate is placed on and bonded to the upper surface of the shield portion 15 with an epoxy resin, and subsequently, the mounting groove 24 and the air groove 23 are processed, and then each corner is subjected to R polishing. The slider portion 14 is formed. Next, the magnetic core 18 is inserted into the mounting groove 24 of the slider portion 14 adhered on the shield portion 15, and this is adhered to the slider portion 14 with epoxy resin or the like. At this time, since the swider section 14 is already fixed to the shield section 15, a jig or the like conventionally required is not necessary, and the bonding work can be easily performed.

The mounting groove 24 is configured to face the through hole 25. Therefore, when the magnetic core 18 is attached to the slider portion 14, the coil attachment portions 18a and 18b and the central core portion 18c project into the through holes 25 formed in the shield portion 15. Next, the surface of the magnetic core 18 on which the magnetic gaps 16 and 17 are to be the sliding contact surface 26 and the surface of the slider portion 14 are polished and finished. At this time, since the shield portion 15 is made of a ferrite material, the attachment to the polishing machine can be performed by magnetic attraction. That is, since the shield portion 15 is made of magnetic ferrite, it is attracted to the magnet, and the shield portion 15 is formed with the through hole 25 having a size large enough to accommodate the magnetic core 18, the coils 19, 30 and the like. Because of this structure, the area viewed from the sliding contact surface (the area of the upper surface portion 15b where the slider portion 14 is disposed) is large, and when magnet chucking is performed, a strong fixing force (chucking force) is exerted. Obtainable. Therefore, when the magnetic head 12 is mounted on the polishing machine, it is possible to use the magnet chucking as a fixing method, which facilitates the mounting work and eliminates the need for a mounting jig.

After completion of this polishing process, the coils 19 and 20 are attached to the coil attachment portions 18a and 18b from the back side of the shield portion 15, and then the bridge bar 21 is attached, so that the magnetic field shown in FIG. The head 12 is formed. The assembly procedure is not limited to the above. For example, before the ceramic plate to be the slider section 14 is bonded to the shield section 15, the slider section halves 14a and 14b are preliminarily divided to prepare the slider section halves. You may combine and join the four components of 14a, 14b, the shield part 15, and the magnetic core 18 collectively.

FIG. 3 shows a cross section of the magnetic head 12 mounted on a magnetic recording / reproducing apparatus (not shown) and slidingly contacting the magnetic disk 27. The figure shows a configuration in which a pair of magnetic heads 12 are in sliding contact with both sides in a state of sandwiching a magnetic disk 27. As shown in the figure, most of the coils 19 and 20 and the magnetic core 13 are surrounded by a ferrite material which is a soft magnetic material. Further, since the through hole 25 is large enough to accommodate the coils 19, 20, etc., the thickness of the shield portion 15 becomes large. Therefore, the induced noise from the outside is surely blocked by the shield part 15, and the magnetic circuit constituted by the magnetic core 13 and the coils 19 and 20 is not affected by the induced noise. Can be done.

It is needless to say that the magnetic head 12 may be in sliding contact with only one surface of the magnetic disk 27 as shown in FIG. Further, in the figure, 28 is a pad for improving the sliding contact state between the magnetic head 12 and the magnetic disk 27. Next, another embodiment of the magnetic head according to the present invention is shown in FIG. The magnetic head 29 shown in the figure is configured such that the shield portion 30 has a stepped shape and a part thereof is extended upward so that the extended portion 30 a can slidably contact the magnetic disk 27. As shown in the figure, the pair of magnetic heads 29 are positioned so that their magnetic gaps face the extending portions 30a and sandwich the magnetic disk 27, thereby functioning as the main magnetic poles of the magnetic core 18, and The extending portion 30a can function as an auxiliary magnetic pole, and the magnetic head 29 can be used for the perpendicular magnetic recording system. With the above structure, high density recording can be realized by the magnetic head 29 having a simple structure.

[0021]

[Effect of device]

 As described above, according to the present invention, it is possible to use the magnetic chucking as a fixing method when mounting the magnetic head on the processing machine, which facilitates the mounting work and also makes the mounting jig unnecessary. Moreover, since the through hole is large enough to accommodate the magnetic head portion, the thickness of the shield member becomes large, and it is possible to reliably shield against external induction noise.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of a magnetic head according to the present invention.

FIG. 2 is an exploded perspective view of the magnetic head shown in FIG.

FIG. 3 is a diagram showing a usage state in which a pair of magnetic heads are arranged so as to sandwich a magnetic disk.

FIG. 4 is a diagram showing a usage state in which a magnetic head is slidably contacted with one surface of a magnetic disk.

FIG. 5 is a diagram showing a magnetic disk having a configuration in which a part of a shield part is extended so as to be in sliding contact with the magnetic disk.

FIG. 6 is a perspective view of an example of a conventional magnetic head.

7 is an exploded perspective view of the magnetic head shown in FIG.

8 is a perspective view showing a state in which a shield material is attached to the magnetic head shown in FIG.

[Explanation of symbols]

 12, 29 Magnetic head 13 Magnetic head portion 14 Slider portion 14a, 14b Slider portion half body 15,30 Shield portion 18 Magnetic core 19,20 Coil 24 Mounting groove 25 Through hole 27 Magnetic disk

Claims (1)

[Scope of utility model registration request] 1. A magnetic head portion provided with a magnetic gap and a coil, a slider for holding the magnetic head portion and maintaining a predetermined sliding contact state with a recording medium, and externally induced noise in the magnetic head portion. In a magnetic head provided with a shield member for preventing intrusion, the shield member is formed of a block of magnetic ferrite, and has a size such that the magnetic head portion can be housed at a predetermined position of the shield member. A magnetic head having a through hole formed therein.