JPH0568765B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a straddle erase type magnetic head, and more particularly to a structure around an erase core.

Prior Art FIG. 9 shows a schematic structure of an example of a conventional straddle erase type magnetic head. In the figure, 1 is lead/
In the light core assembly, 2 and 3 are eraser cores, 4 and 5 are sliders, and 6 is an eraser coil. Erase core 2,
As shown in FIGS. 10 and 11, glass 9, 10 is installed in the cutout windows 7, 8 of the sliders 4, 5.
The read/write gap 11 is welded by
Erasing gaps 1 with gap width w are arranged on both sides of the read/write core assembly 1.
2 and 13 are formed.

When manufacturing this magnetic head, the erasing cores 2 and 3 are
It is supported by a jig and positioned within the windows 7 and 8.

Problems to be solved by the invention Read/write gap 11 of erase cores 2 and 3
The position relative to the width of the erasing gap 12, 13 w
(This determines the erasing track width) and needs to be determined with high precision. but,
Since the erasing cores 2 and 3 are not in contact with the core assembly 1 etc. but are floating in the air, positioning of the erasing cores 2 and 3 is difficult even if a jig is used.

In addition, as the recording density on magnetic disks becomes higher and the track width becomes narrower and the Tpi (track per inch) increases, magnetic heads that can cope with this need to narrow the width of the erase gap and define it with high precision. There is a need. In the above-mentioned magnetic head, it is extremely difficult to make the erasing gap narrow and highly accurate, and it is not possible to sufficiently respond to higher density recording. In addition, in FIG. 11, erase cores 2 and 3
It has also been difficult to accurately determine the longitudinal position (for example, dimension T) of the core assembly 1.

Further, since the above-mentioned magnetic head uses glass and the glass is exposed on the sliding surface, there are the following problems.

The wear resistance of the sliding surface is insufficient.

Holes (voids) are likely to occur in the portion of the glass exposed on the sliding surface, which deteriorates the sliding characteristics.

A high-temperature heating process is required for glass welding, which causes thermal distortion to the core etc., causing cracks and deteriorating the characteristics of the magnetic head.
Additionally, equipment for glass welding is also required.

Means for Solving the Problems The present invention provides a straddle type erase magnetic head having a configuration in which erase cores are arranged on both sides of a read/write gap of a read/write core assembly. A spacer made of a non-magnetic material that regulates the width of the erasing gap is butted on both sides, and an overhanging part made of a non-magnetic material that has a thickness equal to that of the erasing core and extends from the erasing core on both sides. The erase core assembly consists of
The erasing core is abutted against the side surface of the spacer so as to be disposed on both sides of the read/write gap, and the slider is abutted against the side surface of the erasing core assembly.

Function The spacer first leads/leads the erased core assembly.
It serves to position the light core assembly and secondly regulates the width of the erase gap.

The configuration in which the overhang has the same thickness as the eraser core allows the eraser core assembly to be obtained by sliding the block assembly.

The erase core assembly facilitates longitudinal positioning of the read/write core assembly relative to the erase core read/write gap.

Embodiment Next, an embodiment of the straddle erase type magnetic head according to the present invention will be described.

FIG. 1 shows an exploded view of a magnetic head subassembly 20 showing essential parts of the present invention.

Figure 2 shows a straddle erase type magnetic head 21.
is shown upside down. Parts such as housings and terminals are omitted. This magnetic head 21 is
The magnetic head subassembly 20 shown in FIG.
As shown in the figure, a core 23 around which an erasing coil 22 is wound is attached so as to sandwich the erasing core, and a read/write coil 25 and a back bar 26 are assembled into the read/write core assembly.

As shown in FIGS. 1 and 3, the magnetic head subassembly 20 has a read/write core assembly 33 in the center consisting of a pair of read/write cores 31 and 32 abutted to form a read/write gap 30. It has a structure in which T-shaped spacers 34 and 35 made of ceramic, eraser core assemblies 36 and 37 also made of T-shape, and sliders 38 and 39 made of ceramic are butted and glued together on both sides. be.

The spacers 34 and 35 are, as shown in FIG.
It is obtained by slicing a ceramic block 40 along a cutting line 41 indicated by a two-dot chain line. Here, the slicing process is performed with high accuracy, and the thickness dimension _t1 of the spacers 34 and 35 is highly accurate.

As shown in FIG. 6, the eraser core assemblies 36 and 37 are constructed by bonding a ferrite core block 42 with a pair of ceramic blocks 43 and 44 sandwiched between them. It is obtained by slicing along 46. Therefore, the erase core assemblies 36, 37
As shown in the figure, there are erasing cores 47 and 48 in the center, and overhanging members 49 extending from the center on both sides.
It has a structure having 50, 51, and 52.

Thus, in the block assembly 43, the dimensions A, B, and C can be determined with high precision, and the slicing process can also be performed by determining the thickness _t2 with high precision. Therefore, the eraser core assembly 36 described above,
37 also has high precision in the dimensions of each part.

As mentioned above, first, the spacers 34, 3 are bonded to the read/write core assembly 33, which itself forms part of the magnetic head subassembly 20.
5 functions as a positioning means, and secondly, since the thickness t ₁ of the spacers 34 and 35 is highly accurate, the erasing core assemblies 36 and 37 are able to move the spacers 34 and 34 without using special jigs and tools. , 35, the erasing cores 47, 48 are precisely positioned with respect to the read/write gap 30, as shown in FIG.

Erased cores 47 and 48 among spacers 34 and 35
The portions 34a, 35a sandwiched between the read/write core assembly 33 and the read/write core assembly 33 form erase gaps 53, 54. Here, the thickness dimension of spacers 34 and 35 is t ₁
is highly accurate, so the width w ₁ of the erasing gaps 53 and 54 is also determined with high accuracy.

Furthermore, even if the spacers 34 and 35 are made thinner than the above, they can still be obtained with high accuracy, and narrow tracks (high
It is also easy to respond to Tpi).

Furthermore, the erasing core assemblies 36 and 37 are connected to the spacer 3.
It has the same T-shape as No. 4 and No. 35, and is aligned and butted with the end of the arm portion as a reference. This results in
The position of each erase core 47, 48 in the longitudinal direction of the read/write core assembly 33 (the position determined by the dimension _T1 in FIG. 7) is determined more stably and accurately than in the past.

As can be seen from the above, the manufacturing process of the magnetic head subassembly 20 described above can be entirely performed by adhesive bonding. In this case, glass welding is unnecessary, the high temperature heating process associated with glass welding is eliminated, and the read/write core assembly 33 and erase core 47,4
9, the straddle erase type magnetic head 21 has better characteristics than the conventional one.

Furthermore, even when the components of the magnetic head subassembly 20 are glass welded, there are very few glasses, the heating time for welding is short, and there is less thermal strain on the core, and the magnetic head 21 is better than the conventional one. Has good properties.

Further, the upper surface of the magnetic head subassembly 20 constitutes the sliding surface of the magnetic head 21. The sliding surface is the seventh
As shown, read/write core assembly 33
the upper surface, the upper end surfaces of the spacers 34 and 35, the upper end surfaces of the erasing core assemblies 36 and 37, and the sliders 38 and 3;
It is composed of the upper surface of 9. These materials are ferrite or ceramic, and no glass is exposed.

Therefore, the sliding surface has better wear resistance and sliding characteristics than conventional ones.

FIG. 8 shows a core 55 that is a modification of the core 23 in FIGS. 2 and 4. FIG. This core 55 is assembled from above the back bar 26, straddling it.

Furthermore, the magnetic head according to the present invention is applicable not only to floppy disks but also to recording and reproducing from magnetic tapes or hard disks.

Furthermore, the present invention is not limited to a single track as in the above embodiment, but can also be configured as a multiple track.

Effects of the Invention As described above, the invention of claim 1 has the following features. Since the width of the erasing gap is determined by the spacer, the width of the erasing gap can be determined with high precision without using jigs and tools, and it is possible to sufficiently respond to higher Tpi.

Since the erasing core assembly has a structure in which the erasing core and the overhanging part have the same thickness, it can be easily and accurately obtained by slicing the block assembly in which the block of the erasing core and the block of the overhanging part are matched. I can do it.

The high dimensional accuracy of the erasing core assembly makes it possible to improve the accuracy of matching the erasing core assembly to the spacer and matching the slider to the erasing core assembly.

This makes it possible to realize a straddle erase type magnetic head with high dimensional accuracy.

Glass welding is not essential for fixing the spacer, eraser core assembly, and slider, and can substantially eliminate thermal distortion and improve properties.

According to the invention set forth in claim 2, it is possible to improve the wear resistance and sliding characteristics of the sliding surface.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a magnetic head subassembly of an embodiment of the straddle erase type magnetic head of the present invention, and FIG. 2 is a perspective view of an embodiment of the straddle erase type magnetic head of the present invention in an upside down state. 3 is a perspective view of the magnetic head subassembly, FIG. 4 is a diagram showing a state in which a coil etc. is assembled to the magnetic head subassembly in FIG. 3, FIG. 5 is a diagram showing a state in which a spacer is obtained, and FIG. 7 is an enlarged view showing the structure of the sliding surface of the straddle erase type magnetic head shown in FIG. 2. FIG. 9 is a perspective view of an example of a conventional straddle erase type magnetic head, FIG. 10 is an exploded perspective view of the core portion in FIG. 9, and FIG. 11 is a diagram showing the sliding surface in FIG. 9. FIG. 2 is an enlarged diagram showing the structure of FIG. 20... Magnetic head subassembly, 21... Straddle erase type magnetic head, 31, 32... Read/write core, 33... Read/write core assembly, 34, 35... Spacer, 34a, 35
a... Sandwiched part, 36, 37... Erasing core assembly, 38, 39... Slider, 40... Ceramic block, 47, 48... Erasing core, 4
9, 50, 51, 52... Overhanging portion, 53, 5
4...Elimination gap.

Claims (1)

[Scope of Claims] 1. A straddle erase type magnetic head having a configuration in which erasing cores are arranged on both sides of a read/write gap of a read/write core assembly, wherein erasing gaps are arranged on both sides of the read/write core assembly. An erasing core assembly comprising a spacer made of a non-magnetic material for regulating the width butted against each other, an erasing core, and an overhang made of a non-magnetic material having a thickness equal to that of the erasing core and extending from the erasing core on both sides. are abutted against the side surface of the spacer so that the erase core is arranged on both sides of the read/write gap, and the slider is abutted against the side surface of the erase core assembly. Straddle erase type magnetic head. 2 The spacer, overhang and slider are as follows:
A straddle erase type magnetic head according to claim 1, wherein both heads are made of ceramic.