JPH06195621A - Magnetic head assembly - Google Patents

Abstract

PURPOSE:To provide the magnetic head assembly having good electromagnetic conversion characteristics by providing the main surface on the outer side of a main core with an auxiliary core fixed thereto. CONSTITUTION:This magnetic head assembly consists of a main core 10 and auxiliary core 11 which are the magnetic cores to constitute a closed magnetic path via a magnetic gap and a pair of coil bobbins 12, 13 which are wound with driving coils 29 provided by being fitted to both cores 10, 11. A pair of sliders 43, 44 are butted against each other. Center core parts 15, 16 and side core parts 17, 18 holding nonmagnetic materials 14 therebetween are held between both sliders 43 and 44. The main core part 10 has two magnetic gaps operating as a magnetic gap for recording and reproducing and a gap for erasing formed by butting respectively L-shaped side core parts 17, 18 against both sides of a pair of the bar-shaped center core parts 15, 16 joined via the nonmagnetic materials 14 so as to avert magnetical interference. The auxiliary core 11 is constituted by a pair of core members 19, 20 which are formed in correspondence to the core shape of the main core 10 and are joined to each other on the flank side via a nonmagnetic material 55.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head assembly, for example, a magnetic head assembly suitable for writing or reading an information signal on a floppy disk or the like.

[0002]

2. Description of the Related Art Conventionally, as a magnetic head for a floppy disk, one having a structure as shown in FIGS. 18 and 19 has been proposed. This magnetic head has a main core 90 having a magnetic gap for recording / reproducing and a magnetic gap for erasing.
An auxiliary core 91 having a substantially E-shaped cross section, a drive coil 29,
A magnetic head element, which constitutes a magnetic circuit portion by a pair of coil bobbins 12 and 13 around which 30 is wound, is provided by a pair of sliders 93 and 94 having a substantially L-shaped cross section in order to secure a contact characteristic with a floppy disk. It is sandwiched.

The main core 90 and the auxiliary core 91 are
The coil bobbins 12 and 13 are superposed in a so-called stacked state, and are pressed and supported by a U-shaped metal leaf spring 39 inserted together with the main core 90 and the auxiliary core 91 to achieve magnetic coupling.

The magnetic head thus constructed is
For example, it is attached via a gimbal to a carriage and a movable arm that are head supporting members mounted on the floppy disk drive. Recording and reproduction are performed by the pair of magnetic heads on both sides of the floppy disk inserted between the magnetic heads provided above and below.

By the way, in this type of magnetic head device,
Since the recording / reproducing characteristics largely depend on the change of the contact state between the floppy disk and the magnetic head, the device for making the contact between the floppy disk and the magnetic head always constant has been elaborated.

For example, the carriage and the movable arm are provided with a spherical projection having a spherical tip, which corresponds to the center position of the magnetic head, and the tension spring stretched between the carriage and the movable arm causes The device is designed to press the pivot to the magnetic head via the gimbal. According to this, even if the floppy disk causes surface wobbling or the like, the magnetic head follows this around the pivot so that the contact state with the floppy disk can always be kept constant.

However, in the above case, as shown in FIG. 20, which is a sectional view taken along the line XX-XX in FIG.
The gimbal 6 may stretch because it is directly pressed. Especially, if the disk is set / reset in the drive more than 200,000 times, the gimbal 6 plate thickness is 0.05
Since it is as thin as 0.1 mm, the gimbal 6 may be dented or damaged as shown in FIG. More seriously, the auxiliary core 91 is damaged and the magnetic path is destroyed.

As shown in FIG. 20, what causes such trouble is the center line CL which is the pressing position of the gimbal 6.
In contrast, the auxiliary core 91 is located on the near side and the main core is on the far side.
90 is located and the space inside the auxiliary core 91 and the U-shaped leaf spring 39 exists only in the lower peripheral portion of the position where it is pressed by the pivot 8 of the thin gimbal 6 made of stainless steel or beryllium copper. This is because there is no function to support 6. Incidentally, the carriage provided with the pivot 8 and the movable arm are made of engineering plastic (for example, polyphenylene sulfide) and have high rigidity.

Therefore, in order to avoid the deformation and damage of the gimbal, further, in the conventional art, XXIII- of FIG. 22 and FIG.
As shown in FIG. 23 which is a sectional view taken along line XXIII (however, the magnetic shield member (51 in FIGS. 18 to 20) is not shown), the receiving member 99A is incorporated in the magnetic head at a position corresponding to the pivot 8. Things have been proposed.

Alternatively, the H-shaped receiving portion 99B shown in FIG. 24 and the core holding member 98 made of a plastic molded product for magnetically coupling the main core and the front core shown in FIG. It has been proposed to provide a protruding portion in part and use this as a receiving portion 99C for the pivot.

However, in the means for assembling the above-mentioned various receiving members into the magnetic head, these receiving members are dedicated parts for the pivot, resulting in an increase in the number of parts and an increase in the number of assembling steps.

Further, when the auxiliary core 91 is attached to the main core 90 shown in FIG. 18, if dirt or dust adheres to the joint surface of the main core 90,
A gap is generated between the auxiliary core 91 and the electromagnetic conversion characteristics, which is not preferable. Therefore, it is necessary to remove dirt and dust in advance, and therefore the arrow MS
The surface of the main core 90 is observed with a microscope from the direction. However, the slider 94 faces the main core 90, and the legs 94b, 94
c and 94d are erected, and the attachment surface of the main core 90 has legs 94b and 94d.
Since it is on the c and 94d sides, it can be seen from an angle, and the above observation with a microscope is extremely troublesome. In particular, it is difficult to make the above observation in the state where a large number of main cores sandwiched by a pair of sliders are lined up.

In the conventional magnetic head assembly, the following problems occur. As shown in FIG. 20, since the auxiliary core 91 is arranged inside the main core 90, the length l of the bottom wall portion 94a located below the auxiliary core 91 and the coil bobbin 13 and inside the leg portion 94b of the slider 94. ₁ cannot be reduced. For this reason, the rigidity of this bottom wall portion 94a cannot be made sufficiently high, and as shown in FIG. 26, the main core 90 is sandwiched between the sliders 93 and 94, and the auxiliary core 91 is affixed thereto to fix them to each other. In this state, it is difficult to obtain highly accurate flatness on the sliding contact surface with the floppy disk.

As a result, a twist (Fig. 26 (a)), a bulge in the center due to a downward warp (Fig. 26 (b)), and a depression due to an upward warp (Fig. 26 (c)) are likely to occur. , This causes distortion in the output waveform, leading to poor modulation. The deformations shown in FIGS. 26 (a), (b), and (c) often occur in combination. 4
In a high-capacity magnetic head called MB, the standard of flatness of the sliding contact surface is set to 30 nm or less, but there are some that deviate from this standard, which is one of the causes of the decrease in yield.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, in which the receiving member for the pivot is omitted, the number of parts is reduced, and the parts manufacturing cost and the assembly cost are reduced. It is another object of the present invention to provide a magnetic head assembly which guarantees good electromagnetic conversion characteristics with high reliability due to high dimensional accuracy.

[0016]

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

According to the present invention, in a magnetic head assembly having a main core and an auxiliary core fixed to a main surface of the main core, the auxiliary core is fixed to an outer main surface of the main core. The present invention relates to a characteristic magnetic head assembly.

In the present invention, the main core is sandwiched and supported by the pair of main core supporting members, and is provided on one of the pair of main core supporting members disposed inside the main core. It is preferable that at least one of the length of the bottom wall of the coil placement recess and the height of the main core support member is reduced in order to make the magnetic head assembly compact.

In the present invention, the main core is sandwiched and supported by the pair of main core supporting members, and one of the pair of main core supporting members is disposed inside the main core. A coil arranging recess is provided and is attached to a head supporting member via a plate-shaped elastic body, and is configured to be pressed by a pressing portion from the side of the head supporting member via the plate-shaped elastic body. It is preferable that the one main core support member is extended to the vicinity of the plate-like elastic body so as to be integrated with the main core in order to omit the receiving member for the pressing portion.

In the present invention, the main core is sandwiched and supported by the pair of main core supporting members, and one of the pair of main core supporting members is disposed inside the main core. It is preferable that the coil placement recess be provided and that the coil be fitted around the integrated portion of the one main core support member and the main core.

Further, in the present invention, the coil bobbin around which the coil is wound is fitted to an integral part of the main core and the auxiliary core so that a magnetic path is formed between the main core and the auxiliary core. preferable.

Further, in the present invention, the flat winding of the coil is effective in reducing the thickness of the magnetic head assembly.
It is also preferable for increasing the output.

[0023]

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 assembly for a floppy disk that records and reproduces information signals on a 3.5 inch floppy disk.

First, the usage state of the magnetic head assembly will be described. The same parts as those described above are designated by the same reference numerals. As shown in FIG. 17, the magnetic head assembly rotates in the direction of arrow X in the figure with respect to the carriage 1 and the carriage 1 which constitute a head supporting member fixed to a guide bar or the like of the main body of the floppy disk drive (not shown). A movable arm 2 that can be freely attached is provided, and recording / reproduction is performed on both sides of the floppy disk 5 by the magnetic head portions 3 and 4 provided on the tip side of the carriage 1 and the movable arm 2, respectively. It becomes.

The magnetic head portions 3 and 4 are attached to the carriage 1 or the movable arm 2 via the gimbals 6 and 7 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. 86, 87 in the figure
Is a flexible printed circuit (FPC)
One end is fixed to the gimbals 6 and 7, respectively.

The magnetic head portion 3 attached to the movable arm 2 is pressed by a tension spring stretched between the movable arm 2 and the carriage 1 via a pivot 8 to follow the disk 5 and move up and down. It is like this. That is, the magnetic head portion 3 is moved back and forth, left and right and up and down with the pivot 8 as a fulcrum, and the contact state with the disk 5 is always kept constant. Similarly, the carriage 1 is also provided with a pivot 9 so that the contact state of the magnetic head portion 4 with the disk 5 is always kept constant.

In the magnetic head assembly having the above-mentioned structure, during the chucking operation of the floppy disk 5,
The movable arm 2 is pulled toward the carriage 1 by a tension spring, and the floppy disk 5 is sandwiched between the magnetic head portions 3 and 4 facing each other. In this case, as described above, the impact at the time of chucking is concentrated and applied to the pivot 8 especially to the magnetic head portion 3 attached to the movable arm 2.

The structure of the magnetic head unit 3 will be described below. 1 is a perspective view of the magnetic head portion, FIG. 2 is a sectional view of the magnetic head portion attached to the gimbal (a sectional view taken along line II-II of FIG. 1), and FIG. 3 is an exploded perspective view of the magnetic head portion.

As shown in FIGS. 1 and 3, the magnetic head unit 3 mainly includes a main core 10 and an auxiliary core 11, which are magnetic cores forming a closed magnetic circuit via a magnetic gap, and a main core 10 and an auxiliary core 11. A pair of coil bobbins 12 and 13 around which a drive coil is fitted and disposed.

A pair of sliders 43, 44 are butted against each other, and a center core portion 15 having a non-magnetic material 14 sandwiched between the sliders 43, 44,
16 and side core portions 17 and 18 (the main core 10 is constituted by these core portions) are sandwiched.

On one slider 44, the center core portion 15,
Reinforcing leg portions 45, 46, 47 standing in contact with 16 and the side core portions 17, 18 to reinforce the mechanical strength of these core portions,
Joining leg portions 48, 49, 50 for joining with a gimbal (not shown) are erected at positions corresponding to these auxiliary leg portions.

The main core 10 is provided with a pair of rod-shaped center core portions 15 and 16 joined together via a non-magnetic material 14 so as not to magnetically interfere with each other.
7 and 18 are butted, and the butted surfaces have a first magnetic gap and a second magnetic gap (both are not shown). The first magnetic gap operates as a recording / reproducing magnetic gap, and the second magnetic gap operates as an erasing magnetic gap.

On the other hand, the auxiliary core 11 is constructed by joining a pair of core members 19 and 20 formed corresponding to the core shape of the main core 10 on the side surface side with a non-magnetic material 55 interposed therebetween. There is.

The core members 19, 20 have center leg portions 21, 22 and side leg portions 23, 24 at positions facing the center core portions 15, 16 and the side core portions 17, 18 of the main core 10, respectively, They are connected by the connecting members 25 and 26 and have a substantially U-shaped planar shape. Therefore, the center legs 21, 22 and the side legs
By providing 23 and 24, it is possible to secure a joint area between the cores that increases the length of the main core 10 in the depth direction, and improve electromagnetic conversion characteristics.

The coil bobbins 12 and 13 are formed by insert-molding the external terminals 27 and 28 formed by punching out the hoop material, and the body portion around which the drive coils 29 and 30 are wound and the body portion. A pair of upper and lower flange portions 3 that regulate the winding position of the drive coils 29 and 30 wound around the upper portion in the height direction.
1, 32, 33, and 34.

A predetermined number of turns of one drive coil 29 are wound around the coil bobbin 12 through which the side core portion 17 of the main core 10 on the side where the magnetic gap for erasing is formed is inserted, and the start and end of the winding are external terminals. They are wrapped around 27 respectively.

On the other hand, the coil bobbin 13 into which the side core portion 18 of the main core 10 on the side where the recording / reproducing magnetic gap is formed is inserted with a predetermined number of two drive coils 30, and the start and end of the winding are wound. And 3 common parts
It is wrapped around the external terminal 28 of the book.

On the other hand, the flange portions 31, 33 attached to the movable arm 2 side support the external terminals 27, 28 along one side edge of the coil bobbins 12, 13 on the opposite side to the opposite side. , 36 are provided as thick projections.
The external terminals 27 and 28 are set up on the terminal support portions 35 and 36 at predetermined intervals, respectively.

The main core 10 and the auxiliary core 11 are arranged such that the side core portions 17 and 18 of the main core 10 and the side leg portions 2 of the auxiliary core 11 are provided in the through holes 12a and 13a provided in the coil bobbins 12 and 13, respectively.
3 and 24 come into contact with each other and are superposed in a so-called stacked state.
That is, the one side surface 17a of the side core portion 17 and the one side surface 23a of the side leg portion 23 are brought into contact with each other to achieve magnetic coupling, and the one side surface 18a of the side core portion 18 and the one side surface 24a of the side leg portion 24 are brought into contact with each other. By doing so, magnetic coupling is achieved and a closed magnetic circuit is formed.

Therefore, the main core 10, the auxiliary core 11, and the coil bobbins 12 and 13 serve as a magnetic head element having a first magnetic gap that operates as a recording / reproducing magnetic gap, that is, a recording / reproducing head and an erasing magnetic gap. A magnetic head element having an operating second magnetic gap, that is, an erase head is configured.

Further, the through holes 12a of the coil bobbins 12 and 13,
A core pressing member 39 for magnetically coupling the main core 10 and the auxiliary core 11 is inserted into the inside 13a. The core pressing member 39 is made of a thin metal leaf spring, and has side core portions 17 and 18 of the main core 10 and side leg portions 23 and 24 of the auxiliary core 11.
Core pressing piece inserted into coil bobbins 12 and 13 together with
It has 40 and 41 and a connecting portion 42 that connects these.

The core pressing pieces 40, 41 are provided so as to hang down in the direction of the main core 10 from both ends of the connecting portion 42 in the longitudinal direction, and are integrally provided on the connecting member 42. In addition, one part of the core retainer
The tips of 40 and 41 are bent in a dogleg shape, and the bent portion 40
The auxiliary core 11 is pressed against the main core 10 by the elastic forces of a and 41a.

Core holding member 39 formed as described above
In the through holes 12a, 13a of the coil bobbins 12, 13, the tips of the core pressing pieces 40, 41 contact the inner walls of the through holes 12a, 13a, the bent parts 40a, 41a contact the auxiliary core 11, and
A part of the connecting portion 42 comes into contact with the outer peripheral edges of the through holes 12a and 13a and bends to press and support the side leg portions 23 and 24 of the auxiliary core 11 against the side portions 17 and 18 of the main core 10.

As a result, the side core parts 17, 18 and the side leg parts 23, 24 are pressed and supported, and the magnetic and mechanical coupling between the side core parts 17, 18 and the side leg parts 23, 24 is ensured. . Therefore, no gap is formed between the main core 10 and the auxiliary core 11, and there is no inconvenience that the gap acts as an undesired gap when the magnetic head is driven.

In the magnetic head unit 3 having the above structure, a pair of sliders 43 and 44 are attached to the side where the recording / reproducing magnetic gap and the erasing magnetic gap are provided so as to secure the contact characteristic with the floppy disk. Has been done.

Each of the above components is housed in a magnetic shield member 51 having a rectangular frame shape. Magnetic shield member 51
Is made of ferrite, for example.

What should be noted in this example is that the auxiliary core 11 is fixed to the surface of the main core 10 opposite to the legs 45, 46, 47. As a result, as shown in FIG.
Located above slider 43 outside of 10.

Thus, the auxiliary core is placed on the slider 44.
11 and the core pressing member 39 do not exist, and the space (recess) 3a between the leg portions 45, 46, 47 and the leg portions 48, 49, 50 is sufficient to insert the radial portions of the coil bobbins 12, 13. It would be good to form. Therefore, the distance between both legs is smaller than that in the example of FIG. 20, and the length l _{2 of the} region sandwiched by both legs of the bottom wall 44a of the slider 44 (the length of the recess 3a) is smaller than l ₁ in FIG. Will also be smaller and the rigidity of this part will be increased. As a result, the deformations shown in FIGS. 26 (a), (b), and (c) are unlikely to occur, high dimensional accuracy can be maintained, and the yield is improved. Note that l ₂ (1.4 mm) and the thickness t (0.9 mm) of the bottom wall 94a of the slider 94 in FIG. There was a limit.

Further, the position of the leg portion 45 comes very close to the central axis CL on which the pivot 8 abuts, because the auxiliary core 11 and the core pressing member 39 are not provided. As a result, legs 45
Also functions as the pivot receiving member, the pivot receiving member can be omitted, and the number of parts can be reduced. Moreover, the trouble of damaging the gimbal 6 as described in FIG. 21 does not occur.

The main core-slider assembly is manufactured through the steps of FIGS. A wide and shallow groove 43Aa is horizontally provided in the upper portion of one surface of one slider material 43A, glass 52 is fitted in the groove 43Aa, and a deep groove 43Ab is horizontally provided in the upper slider material portion near the groove 43Aa. Has been.
A shallow groove 44Aa, 44Aa having a wide width is provided on one surface of the other slider material 44A in the horizontal direction, and a glass 52 having a low melting point is fitted in the groove 44Aa, 44Aa. The slider materials 43A and 44A are made of a non-magnetic material (for example, calcium titanate or barium titanate).

The main core material 10A comprises elongated core portions 15 and 16 sandwiching a non-magnetic material 14A, and plate-like core portions 17A and 18A sandwiching the non-magnetic materials 14B and 14C on both sides of the core portions 15 and 16.
And the plate-shaped core portions 17A, 18A have through-holes 17a, 18a for determining the depth length of the magnetic gap in a later process.
Are provided respectively. Non-magnetic material 14A, 14B, 14C
Is made of high melting point glass (eg, melting point 700 ° C.), and the main core material 10A is produced by fusion with these. This main core material is a material for the preceding erase type main core.

First, as shown in FIG. 4, the slider material 43
A and 44A are made to face each other so that the surfaces on the glass 52 side face each other, and the main core material 10A is positioned between them.

In the material for the magnetic head assembly of FIG. 20, as shown in FIG. 27, the slider material 93A corresponding to the slider material 43A of FIG. Slider material 94 corresponding to 44A
A is provided with a layer of glass 52 at one location. The slider according to the present example is also different from the conventional slider in this respect.

Next, as shown in FIG. 5, the slider material
43A, the main core material 10A and the slider material 44A are butted against each other and heated to, for example, 500 ° C. to melt the glass 52, and then cooled and solidified. In this way, the slider material
43A, the main core material 10A, and the slider material 44A are joined together to form a magnetic head block 53A.

Next, the magnetic head material block 53A is shown in FIG.
Turn it upside down as shown in.

Next, the slider materials 43A, 44A and the main core material 10A are ground into a shape shown in FIG. 7 in a direction orthogonal to the surface of the main core material 10A. Next, the slider cores 43A and 44A are ground in the direction parallel to the surface of the main core blank 10A, and the main core-slider combination 53B shown in FIG.
And

Next, the main core-slider combination 53B is shown in FIG.
As shown in FIG. 10, the surface is ground upside down again, and then the surface is finished by polishing, as shown in FIG. 10, the surface is finished by polishing, and finally, as shown in FIG.

The core-slider assembly manufactured as described above has the following structure.

A center core portion 1 in which a pair of sliders 43, 44 are butted against each other and a non-magnetic material 14 is sandwiched between both sliders
5, 16 and side core portions 17, 18 (the main core 10 is configured by these core portions) are sandwiched.

On one slider 43, the side core portion 17,
18 and the center core portions 15 and 16 respectively, and reinforcing leg portions 45, 46 and 47 for reinforcing the mechanical strength of these core portions, and gimbals (not shown) at positions corresponding to these reinforcing leg portions, respectively. Joining legs 48, 49, and 50 are erected for joining.

In this main core-slider combination,
Since there is no obstacle to observation of this surface on the side of the surface of the main core 10 to which the auxiliary core is to be attached, FIG.
The inspection of the surface of the main core can be performed easily and surely without making it difficult to observe the surface of the main core as described in the above. Therefore, good electromagnetic conversion characteristics can be stably obtained, which improves the yield and reduces the cost.

FIG. 12 is a sectional view similar to FIG. 2 showing another example.

In this example, a coil bobbin 63 having a small height and a large radial width is used for the coil bobbin, and the main core and the auxiliary core are also reduced in height.
60 and auxiliary core 61 are used. The magnetic shield member 71 having a reduced height is also used for the magnetic shield member.
Then, the sliders 73 and 74 are narrowed to use a small magnetic shield member 71. Since the radial width of the coil bobbin 63 is increased, the length l ₃ of the region sandwiched between the leg portions 75 and 78 of the bottom wall 74a of the slider 74 (the region where the coil bobbin is inserted) is the same as the length shown in FIG. Although it is slightly larger than the length l _2, it is considerably smaller than the length l ₁ in FIG. Therefore, the rigidity of the slider 74 is not affected by the reduction in height. In addition, the slider is downsized and the material cost thereof is reduced.

With this structure, the magnetic head portion 83 can be made small in width and height, and can be made small and thin. The height of the magnetic head part 3 in FIG. 2 is 2.7 mm.
(The same applies to FIG. 20), whereas in this example, the height of the magnetic head portion 83 is 2.3 mm. For a 4MB magnetic head, it was difficult to achieve a surface flatness of 30nm or less when the height was 2.7mm or less, which is standard, but in this example, the height was 2.3mm and the thickness was thin. It was possible to satisfy the above standards. Moreover, since the radial width of the coil bobbin 63 is increased, the number of windings of the drive coil 65 can be increased and the output can be increased. In this way, the degree of freedom in design is increased. In addition, since the small size also serves as the large size, it is possible to standardize the order design and reduce the design man-hours. Other than that, there is no difference from the magnetic head unit 3 of FIG.

Next, the procedure for attaching the magnetic head portion to the gimbal and the FPC will be described with reference to FIGS.

First, as shown in FIG. 13, the magnetic head unit 3
Gimbal 6 is placed on (or 83) and both are bonded. At this time, the tips of the external terminals 27, 28 of the magnetic head portion penetrate through the through holes of the gimbal 6 and project.

Next, as shown in FIG. 14, the tip of the FPC 86 is bonded to the gimbal 6. At this time, the external terminals 27 and 28 of the magnetic head portion are inserted into the through holes of the connection land of the FPC 86.

Next, as shown in FIG. 15, the connection land of the FPC 86 is soldered to the external terminal of the magnetic head portion.

Thus, as shown in FIG. 16, the magnetic head portion 3 (or 83), the gimbal 6 and the FPC 86 are fixed to each other. Then, the gimbal 6 is attached to the movable arm 2 in FIG.

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 assembly according to the present invention is suitable for 3.5-inch floppy disks, floppy disks of other sizes, or magnetic recording media other than floppy disks. Further, as the material of the portion forming the magnetic head assembly, an appropriate material different from the above may be used.

[0072]

In the magnetic head assembly according to the present invention, since the auxiliary core is fixed to the outer main surface of the main core, the coil portion located inside the magnetic head assembly is brought closer to the main core. It is possible to shorten the portion (bottom wall portion) of the main core supporting member that supports the core and is located under the coil portion by the thickness of the auxiliary core. Therefore, the rigidity of the main core supporting member can be increased, and distortion can be prevented from occurring in the main core supporting member when the magnetic head assembly is assembled. As a result, the magnetic head assembly is assured of high dimensional accuracy, good electromagnetic conversion characteristics, and is highly reliable. Moreover, naturally, the yield is also improved.

Further, by improving the rigidity of the main core supporting member, the magnetic head assembly can be downsized and high dimensional accuracy can be maintained.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic head unit according to an embodiment.

FIG. 2 is a cross-sectional view (cross-sectional view taken along line II-II of FIG. 1) of the magnetic head unit.

FIG. 3 is an exploded perspective view of the magnetic head unit.

FIG. 4 is a perspective view showing a first step of manufacturing the main core-slider assembly.

FIG. 5 is a perspective view showing a second step of manufacturing the main core-slider assembly.

FIG. 6 is a perspective view showing a third step of producing the same main core-slider assembly.

FIG. 7 is a perspective view showing a fourth step of manufacturing the same main core-slider assembly.

FIG. 8 is a perspective view showing a fifth step of manufacturing the main core-slider assembly.

FIG. 9 is a perspective view showing a sixth step of manufacturing the same main core-slider assembly.

FIG. 10 is a perspective view showing a seventh step of manufacturing the same main core-slider assembly.

FIG. 11 is a perspective view showing an eighth step of manufacturing the same main core-slider assembly.

FIG. 12 is a cross-sectional view similar to FIG. 2 of a magnetic head portion according to another embodiment.

FIG. 13 is a perspective view showing a first step of fixing the magnetic head unit, the gimbal, and the flexible printed circuit (FPC) according to the embodiment.

FIG. 14 is a perspective view showing a second step of fixing the magnetic head portion, the gimbal and the FPC.

FIG. 15 is a perspective view showing a third step of fixing the magnetic head unit, the gimbal, and the FPC.

FIG. 16 is a perspective view showing a state in which the magnetic head unit, gimbal, and FPC are fixed.

FIG. 17 is a schematic perspective view showing a usage state of the magnetic head assembly.

FIG. 18 is an exploded perspective view of a magnetic head unit according to a conventional example.

FIG. 19 is a perspective view of the magnetic head unit.

FIG. 20 is a cross-sectional view (cross-sectional view taken along the line XX-XX in FIG. 19) of the magnetic head unit.

FIG. 21 is a partial cross-sectional view of a magnetic head part showing a state where the same gimbal is damaged.

FIG. 22 is a perspective view of a magnetic head unit according to another conventional example.

FIG. 23 is a cross-sectional view of the magnetic head portion (XXIII-XXII in FIG. 22.
It is a sectional view taken along line I).

FIG. 24 is a perspective view of a pivot receiving member according to still another conventional example.

FIG. 25 is a perspective view of a pivot receiving member according to still another conventional example.

FIG. 26 is a perspective view showing a modification of the main core-slider assembly according to the conventional example.

FIG. 27 is a perspective view of the main core material and a pair of slider materials before they are combined.

[Explanation of symbols]

3, 4, 83 ... Magnetic head part 3a ... Recessed space 6, 7 ... Gimbal 8, 9 ... Pivot 10, 60 ... Main core 11, 61 ... Auxiliary core 12, 13 , 63 ... Coil bobbin 14, 55 ... Non-magnetic material 15, 16 ... Center core part 17, 18 ... Side core part 19, 20 ... Core member 29, 30, 65 ... Drive coil 39 ... Core pressing members (leaf springs) 43, 44, 73, 74 ... Sliders 44a, 74a ... Bottom walls 45, 46, 47, 48, 49, 50, 55, 58 ... Legs 51 , 71 ... length of the magnetic shield member CL center line l ₁ of the ... magnetic head, l _2, l ₃ ... slider bottom wall

Claims (6)

[Claims] 1. A magnetic head assembly having a main core and an auxiliary core fixed to a main surface of the main core,
A magnetic head assembly, wherein the auxiliary core is fixed to an outer main surface of the main core. 2. A coil provided between a pair of main core support members, the main core being sandwiched between the main core support members and supported, and one main core support member disposed inside the main core of the pair of main core support members. The magnetic head assembly according to claim 1, wherein at least one of a length of a bottom wall portion of the placement recess and a height of the main core supporting member is reduced. 3. A main core support member sandwiched and supported by a pair of main core support members, and one main core support member of the pair of main core support members disposed inside the main core has a recess for coil placement. Is attached to the head support member via the plate-like elastic body, and is pressed by the pressing portion from the head support member side via the plate-like elastic body. 3. The magnetic head assembly according to claim 1, wherein the core support member extends to the vicinity of the plate-like elastic body and is integrated with the main core. 4. A main core support member sandwiched and supported by a pair of main core support members, and one main core support member of the pair of main core support members disposed inside the main core has a recess for coil placement. 4. The magnetic head assembly according to claim 1, wherein the magnetic head assembly is provided with a coil, and a coil is fitted around an integrated portion of the one main core support member and the main core. 5. A coil bobbin around which a coil is wound is fitted into an integral part of a main core and an auxiliary core, and a magnetic path is formed in the main core and the auxiliary core. The magnetic head assembly described in. 6. The magnetic head assembly according to claim 1, wherein the coil is wound flat.