JPH0638003U - Magnetic head - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a magnetic head for recording / reproducing on / from a magnetic tape, and an object thereof is to reduce the cost and the labor of assembling. [Configuration] Gap 2 in the left holder 11 and the right holder 12
The core 13 and the core 14 each having 9 and 30 are fitted and held. Track grooves 21, 22, 23, and 24 are formed above and below the core 13 and above and below the core 14, substantially parallel to the tape running direction. The track grooves 21 to 24 are formed by combining the cores 13 and 14 with the left holder 11 and the right holder 12 and then cutting near the boundaries between the cores 13 and 14 and the holders 11 and 12. Track grooves 21-2
By the processing of 4, the dimensional accuracy related to the track position is kept within a predetermined tolerance. After the track grooves 21 to 24 are formed, the track grooves 21 to 24 are filled with an embedding member 25 made of metal or the like.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic head, and more particularly to a magnetic head for recording / reproducing on / from a magnetic tape.

[0002]

[Prior art]

 FIG. 13 shows a front view of an example of a conventional metal magnetic head. Grooves 81a and 81b are formed in the left holder 81, the left core 83a of the core 83 is fitted in the groove 81a, and the left core 84a of the core 84 is fitted in the groove 81b. Similarly, grooves 82a, 82b are formed in the right holder 82, the right core 83b of the core 83 is fitted in the groove 82a, and the right core 84b of the core 84 is fitted in the groove 82b. There is.

A holder of a magnetic head is formed by a combination of a left holder 81 having cores 83a and 84a fitted in grooves 81a and 81b, and a right holder 82 having cores 83b and 84b fitted in grooves 82a and 82b, respectively. -The core assembly is complete. In addition, 91 and 92 show a gap.

FIG. 14 shows a combination of a left holder 81 having cores 83a and 84a fitted in grooves 81a and 81b, and a right holder 82 having cores 83b and 84b fitted in grooves 82a and 82b, respectively. It shows the situation. Note that FIGS. 13 and 14 show a case where there is a positional deviation between the grooves 81a and 81b and the grooves 82a and 82b.

Further, FIG. 15 is a view of the cross section of the left holder 81 and the right holder 82 at the positions of the alternate long and short dash line f and the alternate long and short dash line h of FIG. Note that FIG. 15 shows a state in which the left core 83a is fitted in the groove 81a and the right core 83b is fitted in the groove 82a. Further, FIG. 16 shows a view seen from the joint surface side with the right holder 82 in a state where the cores 83a and 84a are fitted in the grooves 81a and 81b of the left holder 81, respectively. In FIGS. 15 and 16, 83c indicates a coil of the core 83, and 84c indicates a coil of the core 84.

To assemble the core holder assembly of the magnetic head, first, the left holder 81 and the right holder 82 are processed into grooves 81a, 81b, 82a and 82b, and then the grooves 81a and 81b of the left holder 81 are processed. To the grooves 82a and 82b of the right holder 82, and the right cores 83b and 84b are fitted to the grooves 82a and 82b, respectively. After that, the left holder 81 and the right holder 82 are combined and joined to complete the core holder assembly.

In the core holder assembly of the metal magnetic head, as shown in FIG. 13, the track width is the thickness of the cores 83 and 84, the grooves 81a and 81b of the left holder 81 and the grooves 82a and 82b of the right holder 82. It is determined by the accuracy of dimensions and position, and the accuracy of combination of the left holder 81 and the right holder 82.

The track pitch is determined by the accuracy of the dimensions and positions of the grooves 81a, 81b, 82a, 82b of the holder, and the track width when the left holder 81 and the right holder 82 are combined. In addition, track alignment involves bottom machining the holder to compensate for the required accuracy.

FIG. 17 is a front view of the core / shield / spacer assembly of the ferrite magnetic head. The core / shield / spacer assembly includes a core assembly 111 in which the left core 107 and the right core 109 are butted against the central core 108, and a core assembly in which the left core 103 and the right core 105 are butted to the central core 104. The solid 112, the channel shield 106, and the spacers 102, 110 are formed by being joined. A groove 113 is formed in each of the left cores 103 and 107 and the right cores 105 and 109, and glass is embedded in each groove.

A write gap 123 is formed on the joint surface between the right core 109 and the central core 108, and a read gap 124 is formed on the joint surface between the left core 107 and the central core 108. A write gap 121 is formed on the joint surface between the left core 103 and the central core 104, and a lead gap 122 is formed on the joint surface between the right core 105 and the central core 104. The track widths of the write gaps 123 and 121 and the read gaps 124 and 122 are set to predetermined dimensions by the groove 113.

FIG. 18 shows a perspective view of each component of the core shield / spacer assembly before joining, and FIG. 19 shows a perspective view of each component of the core shield / spacer assembly after joining. To assemble the core shield / spacer assembly, first, the left core 107 and the right core 109 are butted to the central core 108, the core assembly 111 is assembled, and similarly, the left core 103 and the right core are attached to the central core 104. The core assembly solid 112 is assembled by abutting 105.

Next, the core assemblies 111 and 112, the channel shield 106, and the spacers 102 and 110 are joined to complete the core shield spacer assembly. The completed core shield spacer assembly is fitted and fixed in the holder 101.

The core 103 has a rod-shaped leg portion 103a, and the core 105 has a rod-shaped leg portion 105a. Further, the core 104 has U-shaped leg portions 104a and 104b. Similarly, the core 107 has a rod-shaped leg (not shown), and the core 109 has a rod-shaped leg 109a. Further, the core 108 has a U-shaped leg portion (not shown).

After the core shield / spacer assembly is assembled, the leg portion 103 a of the core 103, the leg portion 105 a of the core 105, the leg portion (not shown) of the core 107, and the leg portion 109 a of the core 109 are respectively The coil is fitted.

In the core / shield / spacer assembly of the ferrite magnetic head, the track widths shown in FIG. 17 and the track center deviations of the write gap and the read gap are determined by the grooves 113 of the left cores 103 and 107 and the right cores 105 and 109. Guaranteed with processing accuracy of.

The track pitch is determined by the accuracy with which the core assemblies 111, 112 and the channel shield 106 are combined, but the tolerance is strict, so the position is usually adjusted. To adjust this position, a plurality of channel shields 106 having different dimensions are prepared, and a method of selecting one that satisfies the tolerance, or a gap between the core assemblies 111 and 112 and the channel shield 106 is prepared in advance. There is a method in which the position is adjusted by opening and then the position is adjusted by pouring glass or an adhesive.

[0017]

[Problems to be solved by the device]

 However, in the above-mentioned conventional metal magnetic head, in order to keep the track width, track pitch, and track alignment accuracy within the predetermined tolerances, the grooves 81a, 81b, 82a, 82b of the left holder 81 and the right holder 82 are processed. Strict precision is required, and when the left holder 81 and the right holder 82 are combined, it is necessary to adjust the alignment, and further, bottom processing of the holder is required. Therefore, there is a problem in that the yield of the holder is low and it takes time to assemble the core / holder assembly.

Further, in the above-mentioned conventional ferrite magnetic head, in order to keep the track width, track pitch and track alignment accuracy within predetermined tolerances, the grooves 113 of the cores 103, 105, 107 and 109 are machined. Strict precision is required, position adjustment is required when the core assemblies 111 and 112 and the channel shield 106 are combined, and bottom machining of the core shield spacer assembly is required. Therefore, the cost of the core is high, and it takes time to assemble the core / shield / spacer assembly.

The present invention has been made in view of the above points, and an object of the present invention is to provide a magnetic head capable of reducing the cost and the labor of assembling.

[0020]

[Means for Solving the Problems]

 According to the present invention, in a magnetic head having a core and a core holding member in combination and having a gap, after the core and the core holding member are combined, the dimension regarding the track should be restricted. A track size regulation groove is formed in the vicinity of the boundary of the magnetic tape substantially parallel to the running direction of the magnetic tape.

[0021]

[Action]

 In the configuration of the present invention having the track size regulating groove formed after the core and the core holding member are combined, strict precision is not required for the core and the core holding member, and the position adjustment during assembly can be omitted. it can. For this reason, it is possible to reduce costs and labor for assembling.

[0022]

【Example】

 FIG. 1 is a perspective view of a core holder assembly 10 of a metal magnetic head according to a first embodiment of the present invention. Grooves 11a and 11b are formed in the left holder 11 which is a core holding member, the left core 13a of the core 13 is fitted in the groove 11a, and the left core 14a of the core 14 is fitted in the groove 11b. There is. Similarly, grooves 12a and 12b are formed in the right holder 12 which is a core holding member, the right core 13b of the core 13 is fitted in the groove 12a, and the right core 14b of the core 14 is fitted in the groove 12b. It is mated.

The magnetic head is formed by combining the left holder 11 in which the cores 13a and 14a are fitted in the grooves 11a and 11b, and the right holder 12 in which the cores 13b and 14b are fitted in the grooves 12a and 12b, respectively. The holder / core assembly 10 of FIG. In addition, 29 and 30 show gaps.

On the front surface of the curved shape on which the magnetic tape slides, track size restriction grooves (hereinafter referred to as track grooves) 21 and 22 are formed above and below the core 13 so as to be substantially parallel to the tape running direction. There is. Track grooves 23 and 24 are formed above and below the core 14 substantially parallel to the tape traveling direction.

The track grooves 21 to 24 are formed by combining the cores 13 and 14 with the left holder 11 and the right holder 12, and then, the track widths of the cores 13 and 14 are narrowed so that the cores 13 and 14 are narrowed. It is formed by cutting around the boundary between the left holder 11 and the right holder 12. By processing the track grooves 21 to 24, the dimension related to the track position is set to a predetermined value, and the dimensional accuracy related to the track position is within a predetermined tolerance.

After the track grooves 21 to 24 are formed, the track grooves 21 to 24 are filled with an embedding member 25 made of metal or the like. After that, the embedded member 25 and the cores 13 and 14 are polished, so that the surfaces of the cores 13 and 14 and the embedded member 25 are formed to be flush with each other.

FIG. 2 is a perspective view of the track groove before processing. To assemble the core holder assembly 10 of the magnetic head, first, the left holder 11 and the right holder 12 are processed into the grooves 11a, 11b, 12a, and 12b, and then the left holder 11 is formed into the grooves 11a and 11b, respectively. The cores 13a and 14a are fitted together, and the right cores 13b and 14b are fitted into the grooves 12a and 12b of the right holder 12, respectively. After that, the left holder 11 and the right holder 12 are combined and joined to complete the assembly of the core holder assembly 10.

The cores 13 and 14 are the same as the cores of the conventional metal magnetic head. However, after the core holder assembly 10 is assembled, the thickness of the cores 13 and 14 is made larger than that of the core of the conventional metal magnetic head in order to determine the track width by the track groove processing.

Further, since the dimensional accuracy related to the track position is brought within a predetermined tolerance by processing the track groove, the grooves 11a and 11b of the left holder 11 and the grooves 12a and 12b of the right holder 12 are made of the conventional metal. Unlike a magnetic head holder, it does not require strict dimensional accuracy. Further, it is not necessary to adjust the alignment when combining the left holder 11 and the right holder 12.

FIG. 3 shows a perspective view after processing the track groove, FIG. 4 shows a front view after processing the track groove, and FIG. 5 shows a side view after processing the track groove. After the core holder assembly 10 is assembled, the track grooves 21 to 24 are processed. The track grooves 21 to 24 are formed substantially parallel to the tape running direction.

By processing the track groove, the dimensions related to the track such as the track width, the track pitch, and the track alignment shown in FIGS. 4 and 5 are determined to be within a predetermined tolerance. The track width of the core 13 is determined by the track grooves 21 and 22, and the track width of the core 14 is determined by the track grooves 23 and 24. The track alignment is determined by the track grooves 23 and 24, and the track pitch is determined by the track grooves 21-24.

In the conventional metal magnetic head, the track width tolerance is about ± 0.02 mm, the track pitch tolerance is about ± 0.04 mm, and the track alignment tolerance is about ± 0.01 mm. In this embodiment, the respective tolerances can be set to stricter values.

For example, the track width tolerance can be about ± 0.005 mm, the track pitch tolerance can be about ± 0.01 mm, and the track alignment tolerance can be about ± 0.005-0.01 mm.

In addition to the bottom surface processing for tilt adjustment, the bottom surface processing for ensuring the track alignment of the core holder assembly, which is necessary in the conventional metal magnetic head, is not necessary.

The track groove processing machine for processing the track groove has a sufficient accuracy (± 0.005 to ± 0.005) with respect to the dimensional tolerance related to the track position, such as a flat surface polishing machine, a slicing machine, and a laser processing machine. A processing machine with a diameter of ± 0.01 mm is used.

As a method for processing the track grooves, for example, the track grooves 21 to 24 are processed after the positions, dimensions, and the processing order of the track grooves 21 to 24 are set in the track groove processing machine in advance. At this time, the reference position may be anywhere, but for example, the side surface of the core holder assembly may be the reference position.

The width of the track groove is set to about 0.2 mm to 0.3 mm, and the cores 13 and 14 are cut by about 0.15 mm (on both sides) so that they may be cut to about half the track groove. The total thickness is about 0.3 mm). The track width is 0.15 mm in the write track width and 0.1 mm in the read track width in an example of the cassette streamer.

After processing the track grooves 21 to 24, an embedding member 25 made of metal or the like is bonded to the track grooves 21 to 24 to fill the track grooves 21 to 24. After that, the embedded member 25 and the top surfaces of the cores 13 and 14 are polished, so that the surfaces of the cores 13 and 14 and the surface of the embedded member 25 are formed to be the same surface.

As described above, in the first embodiment, since the grooves 11a, 11b, 12a, and 12b of the left holder 11 and the right holder 12 are not required to be machined with high precision, the left holder 11 and the right holder 12 cannot be machined. The yield can be improved. Further, when the left holder 11 and the right holder 12 are combined, no alignment adjustment is required, and the bottom surface processing of the core / holder assembly solid body 10 is not required. Therefore, it is possible to reduce the cost and the assembling time.

FIG. 6 is a perspective view of a core shield spacer assembly of a ferrite magnetic head according to a second embodiment of the present invention. The core / shield / spacer assembly 30 includes a core assembly 71 having a left core 37 and a right core 39 butted to a central core 38, and a core assembly having a left core 33 and a right core 35 butted to a central core 34. The solid 72, the channel shield 36 that is a core holding member, and the spacers 32 and 40 are formed by being joined.

The core 33 has a rod-shaped leg portion 33a, and the core 35 has a rod-shaped leg portion 35a. Further, the core 34 has U-shaped leg portions 34a and 34b. Similarly, the core 37 has a rod-shaped leg portion (not shown), and the core 39 has a rod-shaped leg portion 39a. Further, the core 38 has a U-shaped leg portion (not shown).

A write gap 53 is formed on the joint surface between the right core 39 and the central core 38, and a read gap 54 is formed on the joint surface between the left core 37 and the central core 38. A write gap 51 is formed on the joint surface between the left core 33 and the central core 34, and a read gap 52 is formed on the joint surface between the right core 35 and the central core 34.

Track grooves 41 to 48 are formed above and below the write gaps 51 and 53 and the read gaps 52 and 54 substantially parallel to the tape running direction. The track grooves 41 to 48 are formed after the core shield spacer assembly 30 is assembled.

That is, the track widths of the write gap 51 and the read gap 52 are narrowed, and the vicinity of the boundaries between the cores 33, 34 and 35, the channel shield 36, and the spacer 40 are cut to form the track grooves 41 to 44. Has been done. Similarly, the track widths of the write gap 53 and the read gap 54 are narrowed, and the vicinity of the boundaries between the cores 37, 38 and 39, the channel shield 36, and the spacer 40 is cut to form the track grooves 45 to 48. ing.

By processing the track grooves 41 to 48, the dimension related to the track position is set to a predetermined value, and the dimensional accuracy related to the track position is within a predetermined tolerance. For example, the track widths of the write gaps 53 and 51 and the read gaps 54 and 52 are made to have a predetermined dimensional accuracy by forming the track grooves 41 to 48.

After the track grooves 41 to 48 are formed, the track grooves 41 to 48 are filled with an embedding member 61 such as glass. After that, in the top surface polishing, the embedded member 61, the cores 33, 34, 35, 37, 38, 39, the spacers 32, 40, and the channel shield 36 are polished so that the embedded member 61 and the embedded member 61 are formed. The surfaces of the adjacent cores 33, 34, 35, 37, 38, 39, the spacers 32, 40, and the channel shield 36 are formed so as to form the same surface.

FIG. 7 shows a perspective view of the components of the core / shield / spacer assembly 30 before joining, and FIG. 8 shows a perspective view of the components of the core / shield / spacer assembly 30 after joining. . To assemble the core / shield / spacer assembly 30, first, the left core 37 and the right core 39 are butted to the central core 38 to assemble the core assembly 71. Similarly, the central core 34 is assembled to the left core 33 and the right core 39. The core assembly 72 is assembled by butting 35 together.

Next, the core assembly 71, 72, the channel shield 36, and the spacers 32, 40 are joined together to assemble the core shield spacer assembly 30. The assembled core shield spacer assembly 30 is fitted and fixed in the holder 31.

After the core shield / spacer assembly 30 is assembled, the legs 33 a of the core 33, the legs 35 a of the core 35, the legs of the core 37 (not shown), and the legs 39 a of the core 39 are , And the coils are fitted respectively.

Since the dimensional accuracy related to the track position is kept within a predetermined tolerance by processing the track groove, the cores 33, 35, 37 and 39 are different from the core of the conventional ferrite magnetic head in that the track width of the read gap is different. No groove processing is required to determine the track width of the write gap. Further, it is not necessary to adjust the position when the core assemblies 71 and 72 and the channel shield 36 are combined to adjust the track pitch.

FIG. 9 shows a perspective view after the track groove is processed, and FIG. 10 shows a perspective view in a state where the embedding member is embedded after the track groove is processed. 11 shows a front view after processing the track grooves, and FIG. 12 shows a side view after processing the track grooves.

After the core shield / spacer assembly 30 is assembled, the track grooves 41 to 48 are processed. By processing the track groove, the dimensions related to the track such as the track width, the track pitch, and the track alignment shown in FIGS. 11 and 12 are determined to be within the predetermined tolerance.

Here, in the conventional ferrite magnetic head, the track width tolerance is ± 0. The tolerance of the track pitch is about 0.01 mm, the tolerance of the track pitch is about ± 0.015 mm, and the tolerance of the track alignment is about ± 0.05 mm. However, in the present embodiment, the tolerance can be set to a more severe value.

For example, the track width tolerance may be about ± 0.005 mm, the track pitch tolerance may be about ± 0.01 mm, and the track alignment tolerance may be about ± 0.005 to 0.01 mm.

It should be noted that, except for the bottom surface processing for tilt adjustment, the bottom surface processing for ensuring the track alignment of the core / shield / spacer assembly 30 which is necessary in the conventional ferrite magnetic head is not necessary.

The track groove processing machine for processing the track groove has a sufficient accuracy (± 0.005 to ± 0.005) with respect to the dimensional tolerance related to the track position, such as a plane polishing machine, a slicing machine, and a laser processing machine. A processing machine with a diameter of ± 0.01 mm is used.

As a method of processing the track grooves, for example, the track grooves 41 to 48 are processed after setting the positions, dimensions, and the processing order of the track grooves 41 to 48 in advance in a track groove processing machine. At this time, the reference position may be anywhere, but for example, the side surface of the core shield / spacer assembly 30 may be the reference position.

As a procedure for processing the track grooves, for example, as shown in FIG. 9, the track grooves 41 to 48 for determining the track widths of the write gaps 51 and 53 and the read gaps 52 and 54 are processed at eight separate locations. There is a way to do it.

Further, first, a groove having a uniform width is formed in the entire core so as to determine the track width of the write gaps 51 and 53, and then the read gaps 52 and 54 are read so as to determine the track width. There is also a method of processing the groove so as to widen only the gaps 52 and 54.

The width of the track groove is about 0.2 mm to 0.3 mm. The track width is 0.15 mm in the write track width and 0.1 mm in the read track width in an example of the cassette streamer.

As shown in FIG. 10, after processing the track grooves 41 to 48, an embedding member 61 such as ceramic is adhered to the track grooves 41 to 48, or an embedding member 61 such as glass is poured. , The track grooves 41 to 48 are filled. After that, as shown in FIG. 6, in the top surface polishing, the embedded member 61, the cores 33, 34, 35, 37, 38, 39, the spacers 32, 40, and the channel shield 36 are polished, so that the embedded member is polished. 61 and the cores 33, 34, 35, 37, 38, 39, the spacers 32, 40, and the channel shield 36 adjacent to the embedding member 61 are formed so as to form the same surface.

As described above, in the second embodiment, the cores 33, 35, 37 and 39 do not require the groove processing for determining the track width of the read gap and the track width of the write gap. Further, it is not necessary to adjust the position when the core assemblies 71 and 72 and the channel shield 36 are combined to adjust the track pitch. Further, bottom processing of the core / shield / spacer assembly 30 is not required. Therefore, it is possible to reduce the cost and the assembling time.

It is needless to say that the present invention is not limited to the magnetic head for the cassette streamer and can be applied to other types of magnetic heads.

[0064]

[Effect of device]

 As described above, according to the present invention, the core and the core holding member do not require strict precision and the position adjustment at the time of assembly can be omitted, so that the cost is reduced and the assembling work is reduced. be able to.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of the present invention.

FIG. 2 is a perspective view of a first embodiment of the present invention before grooving.

FIG. 3 is a perspective view of the first embodiment of the present invention after grooving.

FIG. 4 is a front view of the first embodiment of the present invention after grooving.

FIG. 5 is a side view of the first embodiment of the present invention after grooving.

FIG. 6 is a perspective view of a second embodiment of the present invention.

FIG. 7 is a perspective view of the respective parts of the second embodiment of the present invention before joining.

FIG. 8 is a perspective view of the respective parts of the second embodiment of the present invention after joining.

FIG. 9 is a perspective view of a second embodiment of the present invention after grooving.

FIG. 10 is a perspective view showing a second embodiment of the present invention with a groove filled therein.

FIG. 11 is a front view of the second embodiment of the present invention after grooving.

FIG. 12 is a side view of the second embodiment of the present invention after grooving.

FIG. 13 is a front view of an example of a conventional metal magnetic head.

FIG. 14 is a front view showing a combination of holders of a metal magnetic head.

15 is a cross-sectional view taken along the alternate long and short dash line in FIG.

FIG. 16 is a side view of the holder of the metal magnetic head.

FIG. 17 is a front view of a conventional ferrite magnetic head.

FIG. 18 is a perspective view of each component of a conventional ferrite magnetic head before joining.

FIG. 19 is a perspective view after the components of the conventional ferrite magnetic head have been joined.

[Explanation of symbols]

 10 core holder assembly 11 left holder 12 right holder 13 core 13a left side core 13b right side core 14 core 14a left side core 14b right side core 21-24 track size regulation groove 25 embedding member 29,30 gap 31 holder 32 spacer 33 left side core 33a Leg 34 Central core 34a Leg 34b Leg 35 Right core 35a Leg 36 Channel shield 37 Left core 38 Central core 39 Right core 39a Leg 40 Spacer 41-48 Track groove 51,53 Write gap 52,54 Read gap 61 Embedded member 71 First core assembly 72 Second core assembly

Claims (1)

[Scope of utility model registration request] 1. A combination of a core and a core holding member,
In a magnetic head having a gap, a track formed near the boundary between the core and the core holding member substantially parallel to the running direction of the magnetic tape after the core and the core holding member are combined and the size of the track is regulated. A magnetic head having a size regulation groove.