JPS59193516A - Magnetic head - Google Patents

Abstract

PURPOSE:To secure the satisfactory record/reproduction capacity to a magnetic recording medium of high coercive force and at the same time to improve the wear resistance and the frequency characteristics for a magnetic head, by providing magnetic core blocks to a pair of core halves containing the track width control grooves and winding grooves and filling glass into the track width control grooves via a nonmagnetic oxide layer. CONSTITUTION:The surfaces of a pair of magnetic blocks 1 and 2 made of an alloy magnetic material such as ''Sendust'', etc. to form winding grooves 8 and 9. At the same time, trackwidth control grooves 5 and 5 are formed on both end faces of the locks 1 and 2 which are orthogonal to each other. Then a nonmagnetic layer 4 having thickness equivalent to half the head gap length is formed on each surface of blocks 1 and 2, and the layers 4 of blocks 1 and 2 are butted to each other and pressed and heated after holding a hard solder foil 10 between the rear parts of the layers 4. Thus the rear faces of the blocks 1 and 2 are joined into a body. Then a nonmagnetic material such as SiO2, Al2O3, etc. is attached to the blocks 1 and 2 toward the grooves 5 by a sputtering or vapor deposition process, etc. Thus nonmagnetic layers 6 are formed into the grooves 5 respectively, and then the glass 7 is filled into the grooves 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head that provides sufficient recording and reproducing capabilities for high coercive force recording media.

Conventionally, ferrite materials have often been used in head cores for VTRs or magnetic disks. This is the number M
This is due to the high magnetic permeability and good wear resistance in the high frequency range of f-1 or higher. However,
In recent years, there has been a tendency to use high coercive force recording media made of alloy powder, plating, vapor deposition, etc. in order to improve recording density. However, because the saturation magnetic flux density of conventional head cores made of ferrite materials is low, the coercive force is 1000 (Oc
) The recording capacity of the recording medium is insufficient. Therefore, broadcasting VTRs have been used for special purposes than before.
The head has been changed to the Sendas 1, which has a high saturation magnetic flux density and has been used as a head for many years.

However, with Sendust heads, wear becomes a problem.

The present invention has been made in view of the above circumstances, and its purpose is to provide a magnetic material that has sufficient recording and reproducing ability for high coercive force recording media, has excellent wear resistance, and has good frequency characteristics. It is to provide a head.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the magnetic head of the present invention. In the figure, reference numerals 1a and 2a indicate heel core 7 halves, both of which are made of an alloy magnetic material such as sendust, and the pair of head core halves 1a and 2a constitute a magnetic core block. The rear abutting surfaces of the head core halves la, 2a are joined by silver solder 3, and a non-resistant layer 4 is interposed therebetween.

This non-magnetic layer 4 forms a magnetic layer,
It has a thickness corresponding to the head gap length. The front abutting surfaces of the head core halves 1a and 2a are connected to a pair of 1-rack width regulating tj5 for regulating the toyanop length.
, 5, Si○2, Al2O3, etc., with a non-magnetic oxide layer 6 interposed therebetween, and glass 7 is filled and bonded. Also, on the abutting surface of one of the hesothocore halves 1a, there is a 45° angle.
A V-shaped winding groove 8 having an inclined surface a is formed, and a winding groove 9 paired with this winding groove 8 is formed in the head core half 1a.

7) Winding wires (not shown) are formed on the core halves 1a and ja respectively through the winding grooves 8 and 9.
is being wound.

Here, the nonmagnetic oxide layer 6 formed in the track width regulating grooves 5, 5 of the head core halves 1a, 2a, the glass 7 filled in the trunk width regulating grooves 5, 5, and the head core half 1a.
, 2a is formed to strengthen the bonding force with the other parts.

In other words, glass 7 and an alloy magnetic material such as sendust have poor "wetting" (1), and it is impossible to bond them together, but glass 7 and alloy magnetic materials such as "SiO, which has good wetting (1), etc." By interposing the non-magnetic oxide layer material, the 1-rank width regulating grooves 5, 5 of the head core halves 1a, 2a can be easily filled with the glass 7. The formed non-magnetic oxide layer 6 is firmly attached by physical and chemical coating means.

FIGS. 2 to 4 show a method for manufacturing the helido core of the magnetic heel F. According to this, first, Figure 2 (al
, As shown in (b), the surfaces of a pair of magnetic flocks 1 and 2 made of an alloy magnetic material such as sendust are polished into flat fan-shaped surfaces, and winding grooves 8 are formed on the surfaces of both magnetic blocks 1 and 2. Process 9.

In addition, L-rank width regulating grooves 5, 5 are formed on both orthogonal end surfaces of each of the magnetic blocks 1, 2 by track processing using a wire saw, a cutting machine, a slicing machine, or the like.

Next, as shown in FIG. 3(al), a non-magnetic layer 4 having a thickness corresponding to half of the head gap length is formed on each surface of the magnetic block 1.2 by means such as stick bonding or spuckling. As shown in FIG. 4, the non-magnetic layers 4 of the magnetic block 1.2 are brought together with a silver wax 10 placed between them at the rear to reduce the misalignment of the track forming part. Pressure and heat the magnetic block 1,
Join the rear surfaces of 2 together.

Next, S i
After a non-magnetic material such as 02 or A 1203 is deposited by a coating method such as spackling or vapor deposition, and a non-magnetic layer 6 is formed in the track width regulating grooves 5, 5, the melting point of the silver wax is The trunk width regulating groove 5.5 is filled with glass 7 which melts at a lower temperature. A magnetic core block 11 is thus obtained. To this, Tokoa Block 1
After circularly polishing the gear knob forming surface (tape contact surface) of No. 1,
The magnetic core block shown in FIG. 1 is obtained by cutting with a blade and a wire saw along the dashed line shown in FIG. After that, the head core half 1a is inserted through the winding grooves 8 and 9,
Wind the winding around 2a.

As explained above, according to the present invention, the magnetic core block is provided with a pair of core halves having track width regulating grooves and winding grooves joined together with a predetermined gap length apart, and S in the regulation groove! 02, A
Since the structure is such that glass is filled through a non-magnetic oxide layer such as Ia03, sendust with a high saturation magnetic flux density is used for the magnetic core, and the L-rack width regulating groove that forms the gap is filled with glass. Therefore, the frequency characteristics can be improved and the wear resistance is extremely good.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view of a magnetic core block, and FIGS. 2 to 5 are explanatory perspective views illustrating a method of manufacturing a magnetic core block. 1.2...Magnetic flock, 1a, 2a...Head core half-closed, 4...Nonmagnetic layer, 5...Track width regulating groove, 6...Nonmagnetic enamel, 7... glass. Figure 3-96

Claims (1)

[Claims] A magnetic core block is provided in which a pair of core halves having a track width regulating groove and a winding groove are joined with a predetermined gap length apart, and the I/rack regulating groove has Sio?
- A magnetic head characterized by being filled with glass through a non-magnetic oxide layer such as A1203.