JPH06274818A - Magnetic head, coil winding core or its divided core and manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To stabilize an electromagnetic conversion characteristic and to facilitate the assembly without necessitating an auxiliary core by integrally forming a core so as to form a closed magnetic path. CONSTITUTION:A recording/reproducing core 6A and an erasing core 6B with a square shapes are joined through a high melting point glass layer 7 to constitute a core 6. Both cores 6A, 6B form the closed magnetic path through magnetic gaps 6Ac, 6Bc respectively. Coil half bodies 2Aa and 3Aa and the core half bodies 2Ab and 3Ab whose wire diameters are different from each other are joined while surrounding the side core parts 6Aa, 6Bb of the cores 6A, 6B respectively to become a coil 4. The core 6 is inserted and fixed between sliders 8, 9 to constitute a magnetic head.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head, a coil winding body used for the magnetic head or a divided body thereof, and a method for manufacturing the magnetic head. For example, an information signal is written or written on a floppy disk or the like. The present invention relates to a magnetic head suitable for reading, a coil winding body for the magnetic head or a divided body thereof, and a method for manufacturing the magnetic head.

[0002]

2. Description of the Related Art Conventionally, as a magnetic head for a floppy disk, one having a structure as shown in FIGS. 12 and 13 has been proposed. This magnetic head has a main core 23 having a recording / reproducing magnetic gap and an erasing magnetic gap.
And an auxiliary core 26 having a substantially E-shaped cross section and a drive coil 24.
a pair of sliders 20 each having a substantially L-shaped cross section in order to secure contact characteristics with a floppy disk, in which a magnetic head element having a magnetic circuit section composed of a pair of coil bobbins 24 and 25 around which a and 25a are wound, It is sandwiched by 23.

The main core 23 and the auxiliary core 26 are
The coil bobbins 24 and 25 are superposed in a so-called stacked state, and are pressed and supported by a U-shaped metal leaf spring 27 inserted together with the main core 23 and the auxiliary core 26 to achieve magnetic coupling. After these components are assembled, they are housed in the magnetic shield member 28.

The magnetic head 29 thus configured
14 is turned upside down as shown in FIG. 14 and temporarily fixed to a predetermined position on the head mounting surface 31 of the gimbal 30 (areas shaded so as to intersect each other) with an instant adhesive. The magnetic head 29 is coated with an ultraviolet curable resin 32 (see FIG. 15) between the side wall surfaces of the sliders 20 and 22 and the head mounting surface 31 to be adhesively reinforced, and then covered with a magnetic shield member 28. Both are the same resin
It is fixed to the gimbal 30 by 32.

The gimbal 30 having the magnetic head 29 mounted thereon is further mounted and coupled to a flexible printed circuit 41, which is a head supporting member, as shown in FIG. At this time, the connection terminals of the coil bobbins 24, 25 are fitted and connected in the holes 41a (see FIG. 14) provided in the flexible printed circuit 41.

The magnetic head 29 having such a structure is shown in FIG.
As shown in FIG. 16, the two heads are vertically opposed to each other, and the magnetic head 29 is inserted into the recording / reproducing opening 40a provided in the cartridge 40.
And the sliding surface 32 is brought into contact with the floppy disk 42 rotatably housed in the cartridge 40. In this way, for both sides of the floppy disk inserted between the magnetic heads provided above and below,
As the magnetic head 29 is moved in the radial direction by the rotating operation of the floppy disk, the information signal is recorded and reproduced by the pair of magnetic heads.

However, in the structure of the conventional magnetic head as described above, as a process of assembling, the coil bobbins 24 and 25 are fitted onto the main core 23, and then the auxiliary core 26 is inserted and set, so that a smaller space is required. A pressing member (leaf spring) 27 is inserted therein, and thereby the auxiliary cores 24 and 25 are pressed against the main core 23 to form a closed magnetic circuit, which is a troublesome work.

[0008] As described above, the number of parts is large, the work of setting is difficult, and the auxiliary core is easily broken. Furthermore, it is difficult to attach the leaf spring. Further, also in the processing of these parts, in order to secure the electromagnetic conversion characteristics of the main core and the auxiliary core, it is necessary to finish the contact surfaces of the two with high precision. Although the coils are either manually wound or automatically wound, conventional winding automatic winding machines are complex and require high investment. On the other hand, manual winding has poor workability and a large number of man-hours, making mass production impossible. It has.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a coil winding body can be attached to a core after the core is manufactured so as to form a closed magnetic path. , Easy to assemble and highly productive magnetic head,
It is an object of the present invention to provide a coil winding body used for this magnetic head or a divided body thereof and a method for manufacturing the magnetic head.

[0010]

The present invention has the following constitution in order to achieve the above object.

The present invention provides a magnetic head comprising a magnetic core and a coil winding body mounted on the magnetic core,
The magnetic head is characterized in that the coil winding body is divided into a plurality of pieces, and the division body is joined to each other to form the coil winding body.

In the present invention, it is desirable that the areas of the opposing end faces of the respective coil conductors of the plurality of coil divided bodies joined to each other are different from each other.

Further, in the present invention, it is desirable that the magnetic core is formed so as to form a closed magnetic circuit in advance before the coil winding body is mounted, and that the magnetic core is sandwiched between the slider members.

Further, the present invention is particularly advantageous when applied to a magnetic head configured as a magnetic head by combining and integrating a plurality of magnetic head portions having different functions.

The present invention also relates to a coil winding body or a split body thereof in which a plurality of divided coil portions are joined to each other.

The present invention further comprises a step of producing a plurality of coil divided bodies in producing a magnetic head comprising a magnetic core and a coil winding body mounted on the magnetic core,
The present invention relates to a method of manufacturing a magnetic head, which includes a step of mounting a plurality of the coil divided bodies on the magnetic core, and a step of joining the plurality of coil divided bodies to each other to form a coil winding body.

[0017]

EXAMPLES Examples of the present invention will be described below. The following embodiment is an example in which the present invention is applied to a magnetic head for a floppy disk for recording / reproducing information signals on / from a 3.5 inch floppy disk.

FIG. 1 is a perspective view of the main part of the magnetic head of this example, and FIG.
Is an exploded perspective view thereof, and this example has a component configuration as shown. That is, in the head core, a V-shaped recording / reproducing core 6A and an erasing core 6B are fused by a high melting point glass (for example, a melting point of 700 ° C.), and a nonmagnetic layer 7 is formed in the portion, and both cores 6A and 6B are formed. The magnetic gaps 6Ac and 6Bc are provided in the central portions respectively, and the center core portion 6Aa, the side core portion 6Ab, the center core portion 6Ba, and the side core portion 6B are provided.
b and b respectively form a closed magnetic circuit.

One slider 8 for supporting the cores 6A and 6B has a U-shaped cross section and has three columns 8
a, 8b, 8c project the end portions of the cores 6A, 6B, respectively.
Is in contact with. The other slider 9 on the opposite side is the core 6
The head core is brought into contact with the head core in a shape corresponding to A and 6B (a shape in which the letter of the letter is laid sideways), and the contact surfaces of both are fused by the low melting point glass.

The coils 4 and 4 fitted on the recording / reproducing core 6A side are combined so that the divided coil halves 2Aa and 3Aa surround the side core portion 6Ab, and the other erasing core 6B side is the same. Split coil half 2Bb
And 3Bb are joined so as to surround the side core portion 6Bb. As shown in FIG. 3, the joined coils 4 and 4 are finally pressed and held by the leaf springs 5 and 5 to complete the coils. An adhesive can be used together for these joining. In Figure 1
10 is a lead wire, which will be described later.

Next, the process up to the combination of the coils will be described. Figure 4 shows this. The coils made in advance are of two types, 2 and 3, which will be described later.

As shown in the figure, the specified number of turns is 120 to 130, respectively.
The conductor wire wound around the turn is sealed with a mold resin or the like.
Next, it is cut into halves passing through the center, and the cross section is polished to obtain a highly accurate flat surface. As a result, both coils are divided into coil halves 2Aa and 2Ab, and coil halves 3Aa and 3Ab, respectively. The divided coil halves 2Aa and 3Aa are combined, and the divided coil halves 2Ab and 3Ab are combined.

The reason for such a combination is that the wire halves of the two types of coil half have different thicknesses. FIG. 5 shows this. That is, the drawing shows the cross section of the coil after being sealed with the mold resin 12, but the diameter of the conducting wire is larger in Φa ′ of the 2A type conducting wire 2 than in Φb ′ of the 3A type conducting wire 3. In this way, the outer diameters Φa and Φb are obtained after the insulating coating 11 is coated on the conductor wires having different diameters, and the outer diameters Φa and Φb are wound by a predetermined number at predetermined intervals.

The reason why the diameters of the conductors are changed is that the conductors are electrically connected to each other even if there is some deviation when the coils that have been divided into two are joined again. That is, as shown in FIG. 6, even if the conductor wire 3 of the coil half body 3Aa is abutted with the conductor wire 2 of the coil half body 2Aa correctly (shown by a solid line), it may be slightly displaced (shown by a virtual line). , The conductor 3 of the coil half 3Aa is the coil half 2A
All end faces are connected to the end face of the conductor wire 2 of a. If the conductors 2 and 3 have the same diameter, even if there is a slight deviation at the time of the butting, the cross-sectional area through which the current passes at the butting position becomes small and the electromagnetic conversion characteristics deteriorate.

A connector can be used to ensure the electrical connection of the conductors 2, 3. That is, as shown in FIG. 7, the insulating coating 11 and the mold resin are removed at a predetermined depth by etching or the like at the cut end face to expose the conductor wires 2 and 3. Then, at the time of butting, the conductors 2, 3
Insert the exposed part of the
Connect 51 as a connector. The exposed portion is sealed with the mold resin 52.

As the material for the coil winding, in addition to the above-mentioned conducting wire, as shown in FIGS. 8 (a) and 8 (b), a laminated type coil in which thin films are wound in multiple layers instead of a round wire is the same. It can be divided into two parts.

In the combined coil, as shown in FIG. 9, the insulating layer at the end portion of the conductive wire is peeled off, and the lead wires 10 and 10 are connected to the exposed end portion by spot welding or soldering. The lead wires 10 and 10 are for flexible, printed, and circuit (FPC) connections, and thereby input and output electrical signals.

Further, when the combined coil halves are aligned, stable electromagnetic conversion characteristics can be obtained by aligning the positions while measuring the inductance.

The magnetic head 1 of FIG. 1 in which the coils 4 and 4 are mounted as shown in FIG. 9 is the frame-shaped magnetic shield member of FIG.
It is housed in 28 and shielded from unwanted external magnetic fields. Then, as shown in FIG. 10, the FP is attached to the gimbal 30.
Connected to C41. In this connection, the lead wires 10, 10 are inserted into the through holes 30a provided in the gimbal 30, and the FPC 41
This is done by soldering to the terminal portion 41b on the lower surface of the.

In this example, the coil winding body is divided into two to form a coil half body, and a pair of coil half bodies are joined to form a coil. Therefore, it is easy to mount the coil on the core.
It is not necessary to form a closed magnetic circuit by combining the main core and the auxiliary core, the core is integrated, the number of parts is reduced, and the structure is simplified. Therefore, the magnetic head can be easily assembled. In addition, the magnetic circuit is stable by using an integral core without an auxiliary core.

Further, the disposition of the coil halves with respect to the core and the coupling of the coil halves may be performed at the same time. In this case, the use of an adhesive facilitates the above bonding.

Next, the usage state of the magnetic head will be described.
As shown in FIG. 11, a magnetic head assembly having the magnetic head 1 is shown in FIG. 11 with respect to a carriage 62 and a carriage 62 which form a head supporting member fixed to a guide cover of a floppy disk drive main body (not shown). A movable arm 63 rotatably mounted in the X direction is provided, and recording / reproduction is performed on both sides of the floppy disk 42 by the magnetic heads 1 and 1'provided on the carriage 62 and the distal end of the movable arm 63, respectively. It is configured to be.

The magnetic heads 1 and 1'are attached to the carriage 62 or the movable arm 63 via the gimbals 30 and 30 made of flexible metal leaf springs so as to be movable in the circumferential or radial direction of the disk. , Shows a good followability to the movement of the disc. 41, 41 in the figure
Is an FPC, one end of which is fixed to the gimbals 30 and 30, respectively.

The magnetic head 1 mounted on the movable arm 63 is pressed by a tension spring stretched between the movable arm 63 and the carriage 62 via a pivot 64,
It follows the disk 42 and moves up and down.
That is, the magnetic head 1 is moved back and forth, left and right and up and down with the pivot 64 as a fulcrum, and the contact state with the disk 42 is always kept constant. Similarly, the carriage 62 is also provided with a pivot 65 so that the contact state of the magnetic head 1'with the disk 42 is always kept constant.

In the magnetic head assembly having the above-mentioned structure, during the chucking operation of the floppy disk 42,
The movable arm 63 is attracted toward the carriage 62 by a tension spring, and the floppy disk 42 is sandwiched between the magnetic heads 1 and 1'opposing each other.

Although the embodiments of the present invention have been described above, various modifications can be added to the above embodiments based on the technical idea of the present invention.

For example, the magnetic head according to the present invention is
It is suitable for 3.5-inch floppy disks, other sizes of floppy disks, and magnetic recording media other than floppy disks.

The cross-sectional dimension such as the diameter of the coil conductor may be an appropriate dimension other than the above, and the coil winding body may be divided into three or more parts according to the shape of the core.

In addition to the composite magnetic head for recording / reproducing and erasing, the present invention can be applied to a single magnetic head or magnetic heads of various structures to obtain the same effect.

The present invention is also applicable to a composite magnetic head having a core composed of a main core and an auxiliary core.
In this case, the auxiliary core is joined to the main core, and then the coil split body is mounted and joined.

[0041]

According to the present invention, since the coil winding body is constituted by joining the divided bodies obtained by dividing the coil winding body into a plurality of pieces, the core is completed and the completed core is The divided body can be mounted and joined to form a magnetic head.

As a result, the coil winding body can be easily attached to the core and the magnetic head assembling work can be facilitated. Further, by dividing the coil winding body, it is possible to deal with magnetic heads of various structures, and the degree of freedom in designing the magnetic head is increased.

[Brief description of drawings]

FIG. 1 is a perspective view of essential parts of a composite magnetic head according to an embodiment.

FIG. 2 is an exploded perspective view of an essential part of the composite magnetic head.

FIG. 3 is a perspective view showing an assembly process of the composite magnetic head.

FIG. 4 is a diagram showing a process of combining the coil bobbins.

FIG. 5 is a cross-sectional view of two types of coils after being sealed with the same molding resin.

FIG. 6 is an enlarged schematic view showing a state in which the coil halves are joined together.

FIG. 7 is an enlarged cross-sectional view showing a procedure for joining the coil halves (a procedure different from FIG. 6).

FIG. 8 is a view showing a coil half body of a type different from those in FIGS. 4 and 5, in which FIG. 8A is a perspective view and FIG. 8B is a front view.

FIG. 9 is a perspective view of a semi-finished magnetic head product in which a lead wire is connected to the coil.

FIG. 10 is a perspective view showing a state in which the composite magnetic head is attached to a gimbal and a flexible printed circuit.

FIG. 11 is a schematic front view showing a usage state of the magnetic head.

FIG. 12 is a perspective view of a composite magnetic head according to a conventional example.

FIG. 13 is an exploded perspective view of the composite magnetic head.

FIG. 14 is an exploded perspective view showing how to attach the composite magnetic head to a gimbal and a flexible printed circuit.

FIG. 15 is a perspective view of the composite magnetic head attached to the same gimbal and flexible printed circuit.

FIG. 16 is a perspective view showing the correspondence between the composite magnetic head and a floppy disk.

[Explanation of symbols]

 1, 1 '... Composite magnetic head 2, 3 ... Coil conductor 2A, 3A ... Molded coil 2Aa, 2Ab, 3Aa, 3Ab ... Coil half 4 ... Combination coil 5. ..Leaf spring 6 ... core 6A ... recording / reproducing core 6B ... erasing core 6Aa, 6Ba ... center core portion 6Ab, 6Bb ... side core portion 6Ac, 6Bc ... magnetic gap 7 ... Non-magnetic layer 8, 9 ... Slider 10 ... Lead wire 11 ... Insulation coating 12 ... Mold resin 13 ... Laminated coil conductor

Claims (6)

[Claims] 1. A magnetic head comprising a magnetic core and a coil winding body mounted on the magnetic core, wherein the coil winding body is divided into a plurality of pieces, and the divided pieces are joined to each other to form the coil winding body. A magnetic head comprising a revolving body. 2. The magnetic head according to claim 1, wherein the areas of the opposing end faces of the coil conductors of the plurality of coil divided bodies joined to each other are different from each other. 3. The magnetic core according to claim 1, wherein the magnetic core is configured to form a closed magnetic circuit in advance before the coil winding body is mounted, and the magnetic core is sandwiched between the slider members. Magnetic head. 4. The magnetic head according to claim 1, 2 or 3, wherein a plurality of magnetic head portions having different functions are combined and integrated to form a magnetic head. 5. The coil winding body or the split body thereof according to claim 1 or 2, which is configured such that a plurality of divided coil portions are joined to each other. 6. A method of manufacturing a magnetic head comprising a magnetic core and a coil winding body mounted on the magnetic core, the step of producing a plurality of coil divided bodies, The method of manufacturing a magnetic head according to claim 1, further comprising a step of mounting the core on the core and a step of joining the plurality of coil divided bodies to each other to form a coil winding body.