JPH07230606A - Magnetic head and its production - Google Patents

Abstract

PURPOSE:To obtain a magnetic head with which the reduction of a discarding cost is possible and a process for producing this magnetic head. CONSTITUTION:This magnetic head has a back core 30 which is constituted by forming first, second leg parts 32, 33 and third leg part 34 to be fitted with coils 13, 14 for recording and reproducing and erasing and outer leg parts 35 of an arranging part on a base part 31 and a front core 43 which is constituted by joining first, second outriggers 39, 40 to a core assembly 38 formed by joining a core body 36 for recording and reproducing and a core body 37 for erasing. The back core 30 and the front core 43 are individually assembled and are subjected to working to adjust the size of the overall height and working to adjust parallelism in the stage when the back core 30 is constituted. On the other hand, the cores are subjected to working to adjust a gap depth and working for blending in the state when the front core 43 is constituted; thereafter, both are joined to constitute the magnetic head 44. The defective parts on the side of the back core 30 or the front.core 43 where trouble arises are merely necessitated to be discarded even when the trouble, such as error in the adjustment of the size of the overall height or splashing from working jigs, arises at the time of working and the need for discarding the parts arises.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head used in a floppy disk drive device and a manufacturing method thereof.

[0002]

2. Description of the Related Art As an example of a conventional magnetic head, there is a magnetic head shown in FIGS. In the figure, 1 is a recording / reproducing core body, and 2 is an erasing core body. The recording / reproducing core body 1 is formed into a substantially U-shape by forming a recording / reproducing leg portion 4 and a recording / reproducing side common leg portion 5 on a base portion 3. The base portion 3 is provided with a recording / reproducing gap 6.

The erasing core body 2 has a substantially U-shape by forming two legs, an erasing leg 8 and an erasing side common leg 9, on a base 7. The base portion 7 is provided with an erasing gap 10 for tunnel erasing the information signal track recorded by the recording / reproducing gap 6. In the figure, 11 is a glass, which is designed for magnetic insulation.

Recording / reproducing core body 1 and erasing core body 2
Of the recording / reproducing side common leg 5 and the erasing side common leg 9 are integrally formed to form a magnetic head core 12. A recording / reproducing coil 13 and an erasing coil 14 are fitted to the recording / reproducing leg 4 and the erasing leg 8, respectively.

In the figure, 15 and 16 are first and second outriggers. The first outrigger 15 is formed by forming a rectangular first plate portion 18 and an L-shaped second plate portion 19 on one surface side of a substrate 17 with a space therebetween. A back core body 20 made of a magnetic material is adhered to the first plate portion 18 with an epoxy resin. The second outrigger 16 includes a shaft portion 21 and first and second orthogonal shafts provided at both ends of the shaft portion 21 so as to be orthogonal to the shaft portion 21.
It is composed of 22 and 23 and is formed in a substantially E shape.

The first outrigger 15 and the second outrigger 16 to which the back core body 20 is adhered are the magnetic head core 12 to which the recording / reproducing coil 13 and the erasing coil 14 are attached.
Are sandwiched between the magnetic head core 12 and the magnetic head core 12 by an epoxy resin to form a slider 24. In this case, the back core body 20 is bridged to the recording / reproducing leg 4, the recording / reproducing side common leg 5, the erasing side common leg 9 and the erasing leg 8 and thereby recording / reproducing. And closed magnetic paths 25 and 26 for erasing are formed.

The first and second outriggers 15 and 16 and the back core body 20 are adhered to the magnetic head core 12 and the slider 24
With the above configuration, adjustment processing of the magnetic head overall height A (planar polishing processing), blending processing (chamfering processing), and dimension adjustment processing of the gap depth B are performed. In this case, the height A of the magnetic head and the gap depth B are simultaneously processed.

After that, the slider 24 described above is adhered to the gimbal 27 with an epoxy resin, and the back surface of the gimbal 27 (the side opposite to the sliding surface 24a of the slider 24) is flexible printed with an adhesive (double-sided tape). A substrate (hereinafter referred to as FPC) 28 is attached. Then, the lead wire 13a of the recording / reproducing coil 13 and the lead wire 14a of the erasing coil 14
Is soldered and connected to the wiring of FPC 28. Lead wire 14
When the control circuit (not shown) is activated by connecting the wiring a to the FPC 28, the recording / reproducing coil 13 and the erasing coil 14 are controlled via the FPC 28.

[0009]

By the way, in the above-mentioned magnetic head, the first and second outriggers 15 and 16 and the back core body 20 are adhered to the magnetic head core 12 to form a slider.
24, and the magnetic head total height adjustment processing and the gap depth dimension adjustment processing are performed in a state where the added value is sufficiently high. Therefore, if there is a problem such as total height adjustment error, scattering from the processing jig, scratches, chips, etc. during processing, not only defective parts but also good parts must be discarded, resulting in high disposal cost. There was a problem that it would end up.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a magnetic head and a method for manufacturing the same, which can reduce the disposal cost.

[0011]

In order to achieve the above-mentioned object, the invention according to claim 1 is a first and a second leg portion to which a recording / reproducing coil and an erasing coil are fitted, and the first and second legs. A back core having a third leg portion located between the two leg portions, and an outer leg portion of the array portion located at a portion separated from the first, second, and third leg portions by a predetermined distance; A core assembly for joining a recording / reproducing core body having a recording / reproducing gap and an erasing core body having an erasing gap to form a recording / reproducing and erasing closed magnetic path together with a back core. A front core formed by joining an outrigger, which is located on the top of each of the third leg portion and the outer leg portion of the arrangement portion and whose front surface side forms a sliding surface for the recording medium together with the core assembly. Characterize.

According to a second aspect of the present invention, in order to achieve the above-mentioned object, first and second leg portions in which a recording / reproducing coil and an erasing coil are fitted, and between the first and second leg portions. Located third
A step of performing a desired adjustment process on the back core having the leg portion and the outer leg portion of the arrangement portion positioned at a predetermined distance from the arrangement portion of the first, second, and third leg portions; A recording / reproducing core body having a reproducing gap and an erasing core body having an erasing gap are joined together to form the first, second and third cores.
A core assembly that is joined to the leg of the core to form a closed magnetic path for recording / reproducing and erasing together with the back core, and an outrigger whose front surface forms a sliding surface for the recording medium at positions sandwiching both sides of the core assembly. The method is characterized by including a step of performing a desired adjustment process on the front core obtained by joining the above, and a step of adhering the front core to the back core with a resin agent. In this case, after the recording / reproducing coil and the erasing coil are fitted to the first and second legs of the back core, respectively, the recording / reproducing coil and the erasing coil are connected to a wiring board for connecting to a control circuit. However, after this, the front core may be bonded to the back core with a resin agent. Further, the resin agent may be an epoxy resin or an ultraviolet curable resin.

[0013]

According to the structure of the present invention, the back core and the front core are individually configured, and the height dimension adjusting process and the parallelism adjusting process are performed at the stage when the back core is configured, while the back core and the front core are performed at the stage when the front core is configured. After the gap depth adjustment process and the blending process are performed and the parallel manufacturing processes are performed, the two are joined to form the magnetic head, so the total height dimension adjustment error, scattering from the processing jig, scratches, etc. Even if a defect such as chipping occurs and the component is discarded, the defective component on the defect occurrence side of the back core or the front core may be discarded.

Further, since the recording / reproducing coil and the erasing coil mounted on the back core are connected to the wiring board connected to the control circuit and the front core and the back core are joined, the front core and the back core are joined together. When the magnetic head is constructed by joining the core and the core, the recording / reproducing coil and the erasing coil can be immediately controlled by the control circuit via the wiring board, and in that state, the recording / reproducing coil, It is possible to operate the erasing coil. Since the overall height of the magnetic head is ensured from the height of the front core and the height of the back core, by setting the height of the back core to occupy most of the overall height of the magnetic head, only that much, It is possible to reduce the height of the front core. Further, when the back core and the front core are bonded together, the magnetic resistance value and the inductance between them can be measured. Furthermore, a large joining force can be obtained by joining the front core and the back core with an epoxy resin or an ultraviolet curable resin.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the figure, 30 is a back core made of a magnetic material. The back core 30 has a rectangular base 31. The first and second legs 3 into which the recording / reproducing coil 13 and the erasing coil 14 are fitted are attached to the corners on one side of the base 31.
2, 33 are formed. The first and second legs 32, 33
A third leg portion 34 is formed on the base portion 31 so as to be located between them. On the other side of the base 31 so as to face the first, second, and third legs 32, 33, 34, three array portion outer legs
35 are formed. The back core 30 is subjected to adjustment processing (plane polishing processing) and parallelism adjustment processing for the overall height A.

Further, in the drawing, 36 is a recording / reproducing gap 6
The recording / reproducing core body 36 having The recording / reproducing core body 36 is set to have a height lower than that shown in FIGS. 11 to 14. 37 is an erasing core body 37 having an erasing gap 10. The height of the erasing core body 37 is set to be equal to the height of the recording / reproducing core body 36.

The recording / reproducing core body 36 and the erasing core body 37 are joined to form a core assembly 38. Core assembly 38
Is joined to the tops of the first, second and third leg portions 32, 33 and 34 to form the closed magnetic paths 25 and 26 for recording / reproduction and erasing together with the back core 30.

In the figure, 39 and 40 are first and second outriggers having a length equivalent to that of the core assembly 38. First
The outrigger 39 has a rectangular base 41 having a length equivalent to the length of the core assembly 38, and a longitudinal direction is formed on one side portion of one surface portion (sliding surface side of the recording medium) of the base 41. It has a groove 42 extending to the.

The second outrigger 40 is composed of a shaft member having a length equal to the length of the core assembly 38.
The first and second outriggers 39, 40 are positioned so as to sandwich both sides of the core assembly 38, and are adhered to the core assembly 38 with an epoxy resin to form the front core 43 together with the core assembly 38. is doing. The first and second outriggers 39,
Front core formed by bonding 40 and core assembly 38
The dimension adjustment process and the blending process (chamfering process) of the gap depth B are performed on 43.

A gimbal 27 is held by a back core 30 which has been subjected to a height adjustment process and a parallelism adjustment process.
An FPC (wiring board) 28 having wiring connected to a control circuit (not shown) with an adhesive is attached to the back surface of 27, and a recording / reproducing coil 13 and an erasing coil 14 are provided on the first and second legs.
Fit in 32 and 33.

Thereafter, the front core 43, which has been subjected to the gap depth adjustment processing and the blend processing as described above, is adhered to the back core 30 with an epoxy resin or a UV resin (ultraviolet curing resin), and the back core 30 and Front core 43
The magnetic head slider 24 is constructed from the above, and the magnetic head 44 is completed from the magnetic head slider 24 and other members.

In this magnetic head 44, the back core 30 and the front core 43 are individually assembled to form the back core 30.
While performing the overall height dimension adjusting process and parallelism adjusting process at the stage of configuring, the gap depth adjusting process and the blending process are performed at the stage of configuring the front core 43, and after undergoing a parallel manufacturing process, the both are joined. It is configured. For this reason, even if the total height adjustment error, scattering from the processing jig, scratches, chips, etc. occur during processing and the parts are discarded, the back core 30 or the front core 43 should be discarded. Of these, defective parts on the defect occurrence side will suffice, so that the disposal cost can be reduced.

That is, in the above-mentioned prior art, the first,
The second outriggers 15 and 16 are bonded to the magnetic head core 12 to form the slider 24 (that is, the slider 24 is obtained through a serial manufacturing process), and the magnetic head height is increased while the added value is sufficiently high. Dimension adjustment processing and gap depth dimension adjustment processing are performed, so if defects such as total height adjustment error, scattering from processing jig, scratches, chips etc. occur during processing, not only defective parts but also good parts However, there is a problem that the disposal cost becomes high because it must be discarded. On the other hand, according to the present embodiment, only the defective parts need to be discarded, and the disposal cost can be reduced. In addition, the number of discarded parts can be reduced and the parts can be easily replaced, which in turn can improve the productivity.

Furthermore, since the occurrence of defective products in the working process can be suppressed, the manufacturing yield can be improved.

Further, after the back core 30 and the front core 43 are formed, they can be individually processed to reduce the disposal cost, and the recording / reproducing coil 13 mounted on the back core 30, Since the erasing coil 14 is connected to the FPC 28 connected to the control circuit, and the front core 43 and the back core 30 are joined together, the front core 43 and the back core 30 are joined together to form the magnetic head 44. At the stage of construction, the recording / reproducing coil and the erasing coil can be immediately controlled by the control circuit via the wiring board. Therefore, when the magnetic head 44 is configured, the recording / reproducing coil 13 and the erasing coil 14 can be operated in that state.
Furthermore, since the front core 43 and the back core 30 are bonded to each other with the epoxy resin or the ultraviolet curable resin, the both can be reliably bonded.

In this embodiment, the total height A of the magnetic head is ensured from the height of the front core 43 and the height of the back core 30. For this reason, the back core 30
Is set so as to occupy most of the total height A of the magnetic head, the height of the front core 43 is lowered (flattened on the bottom surface) by that amount, and scattering from the processing jig during processing is reduced. It becomes possible.

Further, when the back core 30 and the front core 43 are bonded together, it becomes possible to measure the magnetic resistance value and the inductance between them. Therefore, it is possible to select a front core having a gap depth having a desired characteristic value based on the inductance measurement result, and thus it is possible to obtain a magnetic head having stable characteristics.

In the above embodiment, the back core 30 has the rectangular base portion 31 and the three outer leg portions 35 of the array portion are formed on the base portion 31.
Instead of this, a back core 30 configured as shown in any one of FIGS. 7, 8, 9 and 10 may be used.

The back core 30 shown in FIG. 7 has plate-shaped outer leg portions 35 of the array portion. With this configuration, when the back core 30 is obtained by molding,
Molding becomes easier, and the die manufacturing cost can be reduced.

The back core 30 shown in FIG.
The outer legs 35 of the array portion of the book are formed, and the outer leg portions 35 of the array portion support the front core 43 at two points. With such a configuration, the total height dimension adjustment and the parallelism adjustment can be performed with higher accuracy than in the case where the arrangement section outer leg portions 35 are three.

The back core 30 shown in FIG. 9 has a base portion 31 having a T-shape, and is provided with one array portion outer leg portion 35. When the base 31 has a rectangular shape, for example, as shown in FIG. 1, FIG. 7, or FIG. 8, the back side 30 should have good flatness when mounted on the gimbal 27 shown in FIG. 3 or 4. However, by configuring the back core 30 as shown in FIG. 9, the flatness of the back surface side can be made excellent, and by extension, the back core 30 can be properly mounted on the gimbal 27.

In the back core 30 shown in FIG. 10, the base 31 is substantially U-shaped, and two outer leg portions 35 of the array portion are provided. With such a configuration, the overall height dimension adjustment and the parallelism adjustment can be performed with high accuracy, and the flatness of the back surface of the back core 30 can be improved.

[0033]

According to the present invention, the back core and the front core are individually assembled, and even if a defect occurs during processing and the parts are temporarily discarded, the back core or the front core is discarded. Since the defective parts on the defect occurrence side of the front core are sufficient, the disposal cost can be reduced. In addition, the total height of the magnetic head is secured from the height of the front core and the height of the back core, and the height of the back core occupies most of the total height of the magnetic head. However, since the height of the front core is lowered, it is possible to reduce scattering from the processing jig during processing. Further, when the back core and the front core are bonded together, the magnetic resistance value and the inductance between them can be measured, and the selection of the front core having the gap depth of the desired characteristic value based on the inductance measurement result. Therefore, the magnetic head having stable characteristics can be obtained.

Further, since the recording / reproducing coil and the erasing coil mounted on the back core are connected to the wiring board connected to the control circuit and the front core and the back core are joined together, the front core and the back core are joined together. When the magnetic head is constructed by joining the core and the core, the recording / reproducing coil and the erasing coil can be immediately controlled by the control circuit via the wiring board, and in that state, the recording / reproducing coil, It is possible to operate the erasing coil. Further, since a large joining force can be obtained by joining the front core and the back core with the epoxy resin or the ultraviolet curable resin, the joining of the front core and the back core can be surely achieved.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing a part of the magnetic head.

FIG. 3 is a gimbal mounted on a part of the magnetic head and
It is an exploded perspective view showing FPC.

FIG. 4 is a perspective view showing the magnetic head.

FIG. 5 is a perspective view showing a front core of the magnetic head.

FIG. 6 is a perspective view showing a state in which a gimbal and an FPC are attached to a back core.

FIG. 7 is a perspective view showing a back core in which the outer legs of the array portion have a plate shape.

FIG. 8 is a perspective view showing a back core in which two array portion outer legs are formed on a rectangular base portion.

FIG. 9 is a perspective view showing a back core in which the base portion has a T shape and one outer leg portion of the array portion is provided.

FIG. 10 is a perspective view showing a back core having a substantially U-shaped base and provided with two outer legs of the array portion.

FIG. 11 is an exploded perspective view showing a part of a conventional magnetic head.

FIG. 12 is a perspective view showing a part of the magnetic head.

FIG. 13 is an exploded perspective view showing a magnetic head.

FIG. 14 is a perspective view showing the magnetic head.

[Explanation of symbols]

 13 recording / reproducing coil 14 erasing coil 28 FPC 30 back core 31 base 32 first leg 33 second leg 34 third leg 35 array part outer leg 36 recording / reproducing core 37 erasing core Body 38 Core assembly 39 First outrigger 40 Second outrigger 43 Front core 44 Magnetic head

Claims (4)

[Claims] 1. A first and second leg portion into which a recording / reproducing coil and an erasing coil are fitted, a third leg portion located between the first and second leg portions, and the first and second leg portions. A back core having an outer leg portion of the array portion located at a predetermined distance from the array portion of the second and third leg portions, a recording / reproducing core body having a recording / reproducing gap, and an erasing portion having an erasing gap. A core assembly that joins core bodies to form a closed magnetic circuit for recording / reproducing and erasing together with a back core, and has a surface located on top of each of the first, second and third legs and the outer leg of the array portion. A magnetic head comprising: a front core, the side of which is joined to the core assembly and an outrigger that forms a sliding surface for a recording medium. 2. A first and a second leg portion into which a recording / reproducing coil and an erasing coil are fitted, a third leg portion located between the first and second leg portions, and the first and second leg portions. A step of performing a desired adjustment process on a back core having an array outer leg located at a predetermined distance from the array of the second and third legs, and a recording / reproducing core having a recording / reproducing gap A core assembly for joining a body and an erasing core body having an erasing gap and joining to the first, second and third legs to form a recording / reproducing and erasing closed magnetic path together with the back core. A step of performing a desired adjustment process on a front core obtained by joining an outrigger whose front surface side forms a sliding surface for a recording medium at a position sandwiching both sides of the core assembly; and the front core being attached to the back core. And a magnetic agent. Method of manufacturing a pad. 3. A recording / reproducing coil and an erasing coil are fitted to the first and second legs of the back core, respectively,
3. The method of manufacturing a magnetic head according to claim 2, wherein each of the recording / reproducing coil and the erasing coil is connected to a wiring board connected to a control circuit, and then the front core is bonded to the back core with a resin agent. 4. The method of manufacturing a magnetic head according to claim 2, wherein the resin agent is an epoxy resin or an ultraviolet curable resin.