JP3274201B2 - Manufacturing method of magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a magnetic head used for a VTR or the like, and more particularly to a method of manufacturing a magnetic head in which a magnetic gap can be accurately butted.

[0002]

2. Description of the Related Art In recent years, magnetic recording / reproducing apparatuses having a high recording density, such as a high-quality VTR, have been actively developed. Therefore, it is desired to develop a magnetic head having a narrow track width so as to cope with such a high recording density. If the track width becomes narrow, high precision at the time of manufacturing is required. At present, when a magnetic gap is abutted, an operator performs fine adjustment using a microscope or the like to perform alignment, but it is extremely difficult to achieve submicron accuracy by this method.

[0003]

In the above-mentioned conventional method of abutting the magnetic gap of the magnetic head, the core half is easily displaced and twisted, requiring the attention and skill of the operator in the alignment work. This has made it difficult to improve the matching accuracy.

[0004]

A method of manufacturing a magnetic head according to the present invention is directed to a magnetic head in which a magnetic gap is formed by abutting a pair of core halves comprising a laminate of a non-magnetic layer and a magnetic layer. In the manufacturing method, at least one V-shaped alignment groove parallel to the magnetic layer is formed in a part of the abutting surfaces of the pair of core halves, and a pair of glass round bars are sandwiched between the alignment grooves. Butt the core halves and glue them together. At this time, the diameter of the glass round bar
Set so that there is a small gap between the core halves
You.

[0005]

Prior to the step of butting a pair of core halves each composed of a laminate of a nonmagnetic layer and a magnetic layer, a V-shaped alignment groove parallel to the magnetic layer is formed in a part of the mating surface. In the meantime, the core half
When pressure and heating are applied while sandwiching a glass round bar having a diameter set to such an extent that a slight gap is formed therebetween, the gap of the magnetic gap formed by the magnetic layer at the time of abutting, and / or In addition, there is no twist, and at the time of joining by pressurizing and heating, the glass round bar melts and no gap is left.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method for manufacturing a magnetic head according to the present invention will be described in the order of steps with reference to the drawings.

(1) First, a metal magnetic layer 2 is formed on one surface of a non-magnetic substrate 1 by sputtering.

(2) As shown in the perspective view of FIG. 1, the non-magnetic substrate 1 on which the metal magnetic layer 2 is formed is overlapped so that the metal magnetic layer 2 is sandwiched between the non-magnetic substrates 1. After the non-magnetic substrate 1 is also stacked on the lowermost portion, (3) a laminate is formed by bonding the substrates with a bonding glass such as a crystallized glass.

(4) This laminate is cut along the lines a, a at a constant cutting width to form a pair of core halves 4a, 4b as shown in the perspective view of FIG.

(5) A winding window groove 5 orthogonal to the metal magnetic layer 2 is provided on the abutting surface serving as a gap surface of one core half 4a.
To form

(6) A V-shaped alignment groove 6 parallel to the metal magnetic layer 2 is formed on the abutting surfaces of the two core halves 4a and 4b.
(7) After the butt surfaces of both core halves 4a and 4b are polished smoothly, a gap material such as SiO ₂ or high melting point glass is formed on the butt surfaces by sputtering. (8) FIGS. As shown in FIG. 3, the core halves 4a and 4b are butted while holding the glass round bar 7 in the alignment groove 6,

(9) In this state, the core halves 4a and 4b are bonded by applying pressure and heat treatment. At this time, the diameter of the glass round bar 7 is set such that a slight gap is formed between the butted core half bodies 4a and 4b. Position is set uniquely. That is, the core halves 4a and 4b maintain the state shown in FIG. 3 during the pressure and heat treatment, and the core halves 4a and 4b do not shift left and right.

(10) The bonded core halves 4a and 4b are
(b) is cut at a predetermined cutting width along the line (b) to produce a gapped bar shown in the perspective view of FIG. Then, a head chip having the gap 9 shown in FIG. 5 is obtained.

The magnetic head manufactured through the above steps is
A highly accurate track width can be obtained without displacement of the butted metal magnetic layer 2.

The present invention is not limited to the embodiments described above, but can be applied to the manufacture of various magnetic heads such as other ferrite heads and MIG heads.

[0016]

According to the manufacturing method of the present invention, it is possible to easily obtain a high-precision narrow-track magnetic head having no displacement of the butted metal magnetic layers, that is, no track displacement.

[Brief description of the drawings]

FIG. 1 is a perspective view of a step of forming a laminate in a method of manufacturing a magnetic head according to the present invention;

FIG. 2 is a perspective view of a step of forming a core half,

FIG. 3 is a side view showing a state in which core halves are butted;

FIG. 4 is a perspective view of a gapped bar manufactured by the method of manufacturing a magnetic head according to the present invention;

FIG. 5 is a perspective view of a head chip manufactured by the method of manufacturing a magnetic head according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Non-magnetic substrate 2 Metal magnetic layer 4a, 4b Core half 5 Winding window groove 6 Alignment groove 7 Glass round bar 9 Gap

Claims (1)

(57) [Claims] 1. A method of manufacturing a magnetic head in which a magnetic gap is formed by abutting a pair of core halves each comprising a laminated body of a non-magnetic layer and a magnetic layer, wherein abutting surfaces of the pair of core halves are provided. Forming at least one substantially V-shaped alignment groove parallel to the magnetic layer,
Abutting the pair of core halves to form the alignment groove;
When a glass round bar is placed on the
The diameter is set so that there is a slight gap between the bodies
A method for manufacturing a magnetic head, wherein the pair of core halves are abutted and adhered while sandwiching the glass round bar.