JPH065413A - Coil part and manufacturing method thereof - Google Patents

Abstract

PURPOSE:To provide the title manufacturing method of coil parts used for magnetic head, transformer or inductor in the structure capable of being manufactured efficiently, miniaturized in thinner shape. CONSTITUTION:A nonmagnetic electric insulating sheet 3 a multitude of conductor 2a-2e are fixed thereto is wound up in spiral form centered on a magnetic core material 4. Next, the terminal parts F-N, S exposed in upper and lower surfaces of a columnar body 5 thus manufactured are connected by the conductors 2a-2e.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil component used for a magnetic head, a transformer, an inductor or the like and a method for manufacturing the same.

[0002]

2. Description of the Related Art Coil components used for magnetic heads, transformers, inductors, etc. are those in which a coil is wound by hand around a magnetic core, and a magnetic thin film and a thin-film copper coil are formed by a thin-film forming technique. There are those which are formed in multiple stages, and further, those which are formed by integrally laminating a conductive coil in a magnetic body by a film forming technique to form a coil have been developed.

[0003]

However, in a coil component used in, for example, a magnetic head, the magnetic head is very small in size for high-density recording and reproducing, and therefore the coil is wound by hand. In this case, the manual winding of the coil is a difficult task requiring skill, and in the manufacture of the magnetic head, labor and time are required for winding the coil, resulting in poor work efficiency and high cost. There was a point. In addition, since the coil is wound, a winding window of a certain size must be provided, and the wire diameter of the coil must be secured to some extent to reduce cutting by manual winding. There is a problem in that it is not possible to respond to the miniaturization and thinning.

Further, in the case of the conventional coil formed of a thin film, the magnetic thin film and the coil are formed in multiple stages, and it is necessary to cover the resin with each step of forming the coil and to polish the coil. There was a problem that there were many man-hours.

Further, in the case of a coil having a laminated structure, it takes a long time to form a fine pattern of conductor layers or a multilayer by a printing method, and again there is a problem that the number of working steps is large.

In view of the above situation, the present invention provides a coil component used in a magnetic head, a transformer, or an inductor, which has a structure which can be efficiently manufactured, and which can be miniaturized and thinned, and a manufacturing method thereof. The purpose is to provide.

[0007]

In order to achieve the above object, the present invention has a non-magnetic and electrically insulating sheet to which a strip-shaped conductor is fixed and which is spirally wound around a magnetic core material. The coil block is solidified to form a coil block. In the coil component of the present invention, preferably, the inner end and the outer end of the conductor are exposed on the end face, and the inner end of a conductor is connected to the outer end of another conductor at the end face by the conductor, and the multiple spiral coil is formed. Or a structure in which both ends of one of the plurality of conductors are exposed to both end faces of the coil block, and both ends of the conductor are respectively connected to end portions of other conductors on both end faces of the coil block. And

Further, the method for manufacturing the coil component of the present invention is
A coil block is formed by forming a plurality of conductors for a plurality of coil components in a non-magnetic and electrically insulating sheet, spirally winding the sheet around the magnetic core material, and then cutting the sheet. It is characterized by being manufactured.

[0009]

In the coil component of the present invention, the coil component is formed by winding and hardening the sheet material having the striped conductor formed around the magnetic core material. Fine patterning of layers is not necessary. In the structure in which a plurality of conductors are formed as the conductor and the inner and outer ends are connected by the conductor, or in the structure in which the inner and outer ends of the conductor are connected by the conductor on both end faces of the coil component, the required number of turns is easily ensured. It The method according to the invention makes it possible to produce a large number of coil components.

[0010]

1 (A) is a perspective view of an embodiment of a coil component according to the present invention, FIG. 1 (B) is a plan view of FIG. 1 (A), and FIG. 1 (C) is a bottom view of FIG. 1 (A). 2A is a perspective view of a non-magnetic sheet to which the conductor of the embodiment is fixed, FIG. 2B is a perspective view of a magnetic core material of the embodiment, and FIG. 2C is a non-magnetic sheet of the embodiment. FIG. 6 is a perspective view of a columnar body in which a magnetic sheet is wound around a magnetic core material.

In FIG. 2A, 3 is a non-magnetic and electrically insulating sheet, which is a synthetic resin sheet or a resin which uses ceramic powder as a binder. It is kneaded with and molded into a sheet. The sheet 3
A plurality of metal conductors 2a to 2e made of copper or the like (for example, the case of five) is formed on one surface by a film forming technique such as sputtering, photolithography and etching.

Of the conductors 2a to 2e, the two conductors 2a and 2b have both ends extended to the upper side of the non-magnetic sheet 3 (the upper side in the drawing, the same applies hereinafter) and the lead-out portion S, G,
H and I are formed, and one conductor 2c extends one end to the upper side of the non-magnetic sheet 3 to form a lead portion J, and the other end extends to the lower side of the non-magnetic sheet 3. A lead-out portion K is formed, and both ends of the other conductors 2d and 2e are extended to the lower side (on the drawing) of the non-magnetic sheet 3 to form lead-out portions L, M, N and F.

This non-magnetic sheet 3 is spirally wound around a magnetic core material 4 made of a magnetic material such as an alloy magnetic core or magnetic ferrite shown in FIG. 2 (B) to form a synthetic resin sheet. In the case of (1), it is rolled and solidified by adhesion or welding, and in the case of a sheet using a binder, it is baked and solidified to form a columnar body 5 as a coil block as shown in FIG. 2 (C).

As shown in FIGS. 1A and 1B, the coil component 1 includes a conductor 2 exposed on the upper end surface of the columnar body 5.
The lead-out portion G of a and the lead-out portion H of the conductor 2b are connected by a conductor 6a formed by plating or coating, and the lead-out portion I of the conductor 2b and the lead-out portion J of the conductor 2c are connected by a conductor 6b. The terminal electrode 7 is formed in the lead-out portion S of the.

As shown in FIG. 1C, the coil component 1 has a conductor 2c exposed at the lower end surface of the columnar body 5.
And the lead-out portion K of the conductor 2d and the lead-out portion L of the conductor 2d.
And a lead-out portion M of the conductor 2d and a lead-out portion N of the conductor 2e are connected by a conductor 6d, and a lead-out portion F of the conductor 2d.
The other terminal electrode 8 is formed on.

In the above embodiment, the non-magnetic sheet is used.
The width R of the gut 3 is about 550 μm, the thickness is about 10 μm, the width of each conductor is about 50 μm, the thickness is about 5 μm, the interval between the conductors is about 50 μm, and the diameter of the magnetic core material 4 is about 300
μm, and the height P is about 550 μm.

As described above, since the coil component can be manufactured by winding and solidifying the sheet, the manual winding work requiring skill of the coil is not required, the labor is reduced, and the pattern for forming the conductor is straight and simple. Therefore, it can be formed in a short time, and the efficiency is improved. In addition, the restriction of miniaturization in the case of manual winding is lifted, and it is possible to make the coil finer and miniaturize.
Thinning is possible.

In the case of this embodiment, by connecting the lead-out portions of the conductors exposed at both ends of the cylindrical body 5,
Each of the conductors wound inside forms a coil of 5 lines starting from the terminal electrode 7 and ending at the terminal electrode 8. For example, when the non-magnetic sheet 3 is wound around the magnetic core material 4 eight times, the coil component 1 having 40 turns (5 lines × 8) can be formed.

As in this embodiment, a plurality of conductors 2a to 2e are formed on the sheet 3, and the inner end of a certain conductor is connected to the outer end of another conductor at the end face of the cylindrical body 5. As a result, multiple spiral coils can be formed, and the number of turns can be easily secured. Further, the conductor 2c is provided with lead-out portions at both ends of the cylindrical body 5 and is connected to the other conductor, so that it becomes easier to secure the number of turns.

FIG. 3 is a perspective view of a raw material showing an embodiment of the method of the present invention for efficiently manufacturing the cylindrical body 5. The method shown in FIG. 3 is applied to a plurality of conductors 2 for a plurality of coil components 1.
Is formed by providing a cutting margin 9 on a wide non-magnetic sheet 3A,
This is a method of forming a plurality of columnar bodies 5 at a time by winding the magnetic core material 4A in a spiral shape, firing, and then cutting at the cutting allowance 9. This method makes it possible to produce a large number of cylinders 5 for mass production. Suitable for

This coil component can be used as an inductor or as a transformer with an end connection structure in which some of the conductors 2a to 2e are divided into a primary winding and the other is divided into a secondary winding. It also has uses described below.

FIG. 4A is a perspective view showing a case where a coil component 1A of another embodiment according to the present invention is mounted on a floating magnetic head, and FIG. 4B is a perspective view of the embodiment. Figure 4
As shown in (B), the coil component 1A of the present embodiment is formed by winding a non-magnetic sheet 3a to which a conductor is fixed around a square pole-shaped magnetic core material 4a to form a square pole. A conductor for connecting the lead portion, and 11 for a terminal electrode.
As shown in FIG. 4 (A), the magnetic head 20 has a protruding ra
The coil component 1A and the magnetic core 23 are bonded to the tail end portion of the slider 22 made of a magnetic material such as magnetic ferrite in the recording medium running direction X with the glass 24 via the gap portion 26, and The magnetic component back bar 25 is adhered to the coil component 1A and the magnetic substance core 23 at their lower surface portions.

The attachment structure of the coil component 1A to the slider 22 can be changed in various ways such that the core material 4a is oriented in the magnetic medium running direction X and two coil components are incorporated.

The magnetic head can be used in addition to the floating magnetic head, a magnetic head for a floppy disk,
There are magnetic heads for video tape recorders, digital audio tape recorders, and the like.

FIG. 5A is a side sectional view showing a case where a coil component of another embodiment according to the present invention is applied to a disk type rotary transformer, and FIG. 5B is a coil of another embodiment according to the present invention. It is a perspective view which shows the case where a component is applied to a coaxial type rotary transformer. In the disc type rotary transformer of FIG. 5A, the sheet 3 and the conductor 2 are connected to the magnetic core material 4 as described above.
Rotor 1 formed of coil parts wound around B
2A and a stator 12B having the same structure are opposed to each other with a space in between. In addition, 7 and 8 show terminal electrodes.

Further, in the coaxial type rotary transformer shown in FIG. 5B, the sheet 3 and the conductor 2 are connected to the magnetic core 4 as described above.
Rotor 1 formed of coil parts wound around D
3A (or a stator) and a stator 13B (concentrically arranged around the stator 3A) formed by a coil component obtained by winding the sheet 3 and the conductor 2 around the cylindrical magnetic core 4E as described above. Or rotor).

[0027]

According to the first aspect of the present invention, the non-magnetic sheet to which the strip-shaped conductor is fixed is spirally wound around the magnetic core material to form the coil component. Eliminates the need for skilled manual winding work and reduces labor. Further, unlike the laminated coil, it is not necessary to form a fine pattern of the conductor layer, so that the coil component can be efficiently manufactured. Further, the limitation of the coil size in the manual winding is removed, and the size and the thickness can be reduced.

According to the second aspect, since multiple spiral coils can be formed and the number of turns can be easily ensured, further miniaturization and thinning can be achieved.

According to the third aspect, a larger number of multiple spiral coils can be formed, and the number of turns can be easily ensured, so that further miniaturization and thinning can be achieved.

According to the fourth aspect, since a plurality of coil blocks can be manufactured at one time, the coil component can be manufactured efficiently.

[Brief description of drawings]

1A is a perspective view of an embodiment of a coil component according to the present invention, FIG. 1B is a plan view of FIG. 1A, and FIG. 1C is a bottom view of FIG. 1A. .

FIG. 2A is a non-magnetic sheet to which the conductor of the embodiment is fixed.
And a perspective view of the magnetic core material of the embodiment,
FIG. 6C is a perspective view of a cylindrical body in which the non-magnetic sheet of the embodiment is wound around a magnetic core material.

FIG. 3 is a perspective view showing an embodiment of a method of manufacturing the columnar body.

FIG. 4A is a perspective view showing a case where a coil component of another embodiment according to the present invention is used in a floating magnetic head, and FIG. 4B is a perspective view of the embodiment.

5A is a side sectional view showing a case where a coil component of another embodiment according to the present invention is applied to a disk type rotary transformer, and FIG. 5B is a coil component of another embodiment according to the present invention. It is a perspective view showing the case where is applied to a coaxial type rotary transformer.

[Explanation of symbols]

 1, 1A Coil parts 2, 2a to 2e, 6a to 6d, 10 Conductors 3, 3A, 3a Non-magnetic sheet 4, 4A to 4E, 4a Magnetic core material 5 Cylindrical body 7, 8, 11 Terminal electrode 9 Cutting allowance 12A rotor 12B stator 13A rotor (stator) 13B stator (rotor) 20 magnetic head 22 slider 23 core 24 glass 25 back bar 26 gap part F to N, S lead part

Claims (4)

[Claims] 1. A coil component used in a magnetic head, a transformer, or an inductor, wherein a non-magnetic and electrically insulating sheet having a strip-shaped conductor fixed thereto is spirally formed around a magnetic core material. A coil component characterized by being rolled and solidified. 2. The conductor according to claim 1, wherein a plurality of conductors are fixed to the sheet, and the sheet is spirally wound around a magnetic core material to form a coil block, and at the same time, the conductor block is formed. A coil component, wherein an inner end and an outer end are exposed on an end face, and an inner end of a conductor is connected to an outer end of another conductor at the end face by a conductor to form a multiple spiral coil. 3. The conductor according to claim 2, wherein both ends of one of the plurality of conductors are brought out to both end faces of the coil block, and both ends of the conductor are respectively end parts of other conductors at both end faces of the coil block. Coil parts characterized by being connected to. 4. A plurality of conductors corresponding to a plurality of coil components are formed in a non-magnetic and electrically insulating sheet, and the sheet is spirally wound around a magnetic core material and then cut. And a coil block is produced to produce a coil component.