JPS60154317A - Manufacture of straddle erase type magnetic head - Google Patents

Abstract

PURPOSE:To decrease the assembling man-hour by surface grinding a bonding face of an erasure magnetic gap and coating an inorganic film to a part and bonding the bonding face and both side faces of the core with an organic adhesives. CONSTITUTION:A bonding face 12 formed by contacting sliders 9, 9' made of a nonmagnetic substance where magnetic poles 51, 51' at the tip of erasure magnetic cores 5, 5' are imbedded projectingly to a magnetic medium and a sliding face with recording and reproducing magnetic cores 1, 2 is surface grinding so as to be flush with the magnetic poles 51, 51'. A spacer 12 made of SiO2 is coated to a part of the bonding face 12. The bonding face 12 is opposed to a magnetic gap 21, both side faces of the cores 1, 2 and the bonding face 12 are bonded by organic adhesives 10, 10' so as to constitute the magnetic head taking the thickness of a spacer 11 as the width of the erasure magnetic gap. The bonding face 12 is processed only with the surface grinding, then the grinding is made easy and the assembling man-hour is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical Field The present invention relates to a method of manufacturing a magnetic helad for recording and reproducing digital signals on a magnetic medium in a digital magnetic recording and reproducing device such as a floppy disk device.

((b) The magnetic heads used in prior art Fronbi disk devices include a tunnel erase head in which an erase head is provided on both sides of the recording/reproducing head to create a magnetic gap in the same direction, and a There is a straddle erase head in which an erasing magnetic pole is disposed across a gap of 1, and erasing is performed by leakage magnetic flux between the gap between the recording/reproducing head and the erasing magnetic pole.

All of these magnetic heads use an erasing head to magnetically shape and erase the distortion or disturbance on both sides of the recording signal caused by the recording/reproducing head.
This is intended to prevent deterioration of the signal-to-noise ratio caused by the positional deviation of the magnetic head from the track.

As shown in FIG. 1, the conventional straddle erase head has a recording/reproducing head that forms a recording/reproducing gap at the joint between magnetic core 1 and magnetic core 2, and forms a closed magnetic path with magnetic core 6. A recording/reproducing winding 4 wound around the core 2 exchanges signals with the magnetic medium.

The erase head is a slider 9.91 made of non-magnetic material.
The magnetic cores 5, 51 embedded in the magnetic cores 5, 51 and the bent portions 8, 8+ at the bottom of the magnetic core B, around which the erasing winding 7 to which the erasing signal is supplied are wound, come into magnetic contact to form a closed magnetic path. .

That is, in this type of magnetic head, the magnetic cores 1 and 2 forming the magnetic gap 21 for recording and reproducing are magnetic, as shown in FIG. 6, which shows the sliding surface with the magnetic medium in FIG. A slider 9 in which a magnetic core 5, 51 with a protruding magnetic pole portion 51, 51' is embedded in the sliding surface with the medium.
91, and erase magnetic gap 52.52
' is formed.

An important characteristic of these straddle erase heads is the erase rate, which indicates the degree of erasing, due to the erase magnetic gap 5.
2.52', and the dimensional accuracy of the erasing magnetic gap 52.52' must be well controlled in order to obtain a specified erasing rate. In order to maintain dimensional accuracy, the fourth
As shown in the example in the figure, the magnetic pole portions 51 and 51 of the erasing head are located near the magnetic gap 21 of the magnetic cores 1 and 2 of the recording/reproducing head.
After polishing the bonding surface 12 facing 12 in advance by a dimension corresponding to the erasing magnetic gap 52, the sliders 9, 91 in which the erasing magnetic cores 5, 51 are embedded are attached with adhesive 1.
A method is used to form a magnetic head by bonding at zero. (Also, as shown in another example in FIG. 5, the vicinity of the magnetic pole parts 51, 51' of the magnetic cores 5, 51 embedded in the slider 9.91 is erased from the joint surface 12 of the recording/reproducing magnetic core 1.2. This is a method in which the magnetic gap 52 is ground in advance by a dimension corresponding to the magnetic gap 52.

(c) Conventional Problems In the conventional method shown in FIGS. 4 and 5, the processing for forming the erasing magnetic gap 52, 52' involves not only plane polishing of the bonding surface but also the recording/reproducing magnetic core 1, It is necessary to polish the sides of the magnetic cores 1 and 2 or the vicinity of the magnetic pole parts 51 and 51' of the sliders 9 and 9' into a concave shape, and these polishing processes are performed after assembling the recording and reproducing magnetic cores 1 and 2, respectively, or after erasing. This process has to be carried out after the magnetic core 5 and slider 9 are assembled, and there is a drawback that the polishing process may cause misalignment or damage to the magnetic core 1, 2, 5 or the slider 9, resulting in a lack of workability.

B.) OBJECTS OF THE INVENTION An object of the present invention is to provide a magnetic head with uniform characteristics that eliminates the drawbacks of the conventional head, facilitates polishing, and reduces the number of assembly steps.

(e) Structure of the present invention The present invention involves polishing the bonding surface 12 on the same surface as the magnetic pole portion 51 on the sliding surface with the magnetic medium, and sputtering or vapor depositing an inorganic film such as a 5i02 film on a part of the bonding surface 12. conduct,
Straddle erase magnetism characterized by sandwiching and adhering the bonding surface 12 and both sides of the magnetic cores 1 and 2 for recording and reproduction, which form the magnetic gap 21 for recording and reproduction on the sliding surface of the magnetic medium, using an organic adhesive. This is a method of manufacturing a head.

(f) Embodiment of the present invention An embodiment of the straddle erase head of the present invention is shown in FIG.
As shown in FIG. 7, a slider 9.9' made of a non-magnetic material is embedded with the erasing magnetic cores 5, 51 with the magnetic pole portions 51.51' at the tips protruding from the sliding surface with the magnetic medium. The joint surface 12 in contact with the recording and reproducing magnetic cores 1 and 2 is connected to the magnetic pole part 5.
1. Polish the surface so that it is the same surface as 5j'. A spacer 11 such as 5102 is sputtered or vapor-deposited on a part of this polished joint surface 12 to a thickness approximately equal to the dimension of the erasing magnetic gap. In this way, the bonding example 12 of the polishing process 91 is made to face the magnetic gap 21 in which recording and reproducing magnetic cores 1 and 2 are bonded, and an organic adhesive 10 such as low melting point glass or epoxy is applied to both sides of the magnetic core 1 and 2. A magnetic head is constructed in which the thickness of the spacer 11 is the width of the erasing magnetic gap. Furthermore, a straddle erase head is formed by attaching a recording/reproducing winding and a magnetic core, and an erasing winding and a magnetic core, respectively.

(g) Effects of the present invention As described above, according to the present invention, the joining surface 1 of the erasing magnetic gap 52 of the erasing magnetic head of the straddle head
2 requires only surface polishing, and the polishing process is easy, the assembly process is simple, and the workability is excellent, the cost can be reduced, and a highly reliable magnetic head with uniform characteristics can be obtained.

[Brief explanation of drawings]

Fig. 1 is an external perspective view showing the structure of a conventional straddle erase head, Fig. 2 is a bottom view showing the sliding surface with the magnetic medium in the conventional magnetic head shown in Fig. 1, and Fig. 3 is an A in Fig. 2. -A partial vertical sectional view taken from A', FIGS. 4 and 5 are bottom views of the conventional magnetic to RAD after processing and assembly of the erasing magnetic gap, and FIG. 6 is the magnetic head according to the present invention. FIG. 7 is a bottom view of the erasing magnetic gap after processing and assembly, and FIG. 7 is an exploded view of a part of the magnetic head according to the present invention after processing and assembly. Note that 1, 2.3.5.5', 6: magnetic core, 4: recording/reproducing winding, 7: erasing winding, 9.9' varnish slider. 10: adhesive, 11 varnish spacer, 12: bonding surface. 21: Magnetic gap for recording and reproduction, 51.51':
ffl pole part, 52.52': Magnetic gap for erasing Fig. 1/ Fig. 2 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7

Claims (1)

[Claims] 1. Butt to form a magnetic gap for recording and reproduction 2.
Both sides of the magnetic core for recording and playback. In the straddle erase head, which is held at the joint surface of a slider made of a non-magnetic material in which an erasing magnetic core is embedded, the magnetic pole part of the tip of which protrudes onto the sliding surface with the magnetic medium across a predetermined erasing magnetic gap, A method for manufacturing a straddle erase type magnetic head, characterized in that both side surfaces of the magnetic core are sandwiched and adhered with an adhesive so that the surface thereof is flush with the side surface facing the recording/reproducing magnetic core of the magnetic pole part.