JPH02130704A - Manufacture of magnetic head - Google Patents

Abstract

PURPOSE:To reduce the fraction defective of a magnetic head by pressing two ceramic plates against ferrite plates from one side of the ferrite plates, with a ceramics plate being pressed against the ferrite plates from the other side. CONSTITUTION:The 3rd ceramic plate 5, platy ferrite plates 6a, 7a, 6b, and 7b, and the 1st and 2nd ceramic plates 3 and 4 are set in a ceramic frame 1 in the described order after a groove having the shape corresponding to the gap section of the magnetic head to be manufactured is previously worked to the ferrite plates 6a, 6b, 7a, and 7b and the ceramic plates 3, 4, and 5 are pressed against the ferrite plates 6a, 7a, 6b, and 6b by turning a screw 2 fitted to the frame 1. Welding glass bodies 8 are respectively inserted between butt deposition surfaces of the ferrite plates 6a and 7a and between 6b and 7b so that the glass can deposit the butt welding surfaces to each other due to the temperature rise produced by the pressing force applied in the direction perpendicular to the deposition surfaces. Then the plates 6a, 6b, 7a, and 7b are sliced to chips to manufacture magnetic heads.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a magnetic head, which is a main component of a floppy disk device or a VTR (video tape recorder).

[Prior Art] FIG. 3 is an explanatory diagram showing a conventional magnetic head manufacturing method disclosed in, for example, Japanese Patent Application Laid-Open No. 63-91806. In the figure, 1 is a ceramic frame, 2 is a pressurizing screw attached to the frame 1, 10 is a ceramic plate, 11 is a divided ceramic plate, 12a = 12c and 13a
13c is a plate-shaped ferrite plate forming a magnetic head, and 8 is a welding glass for welding between ferrite plates 12a and 13a, between ferrite plates 12b and 13b, etc.

Next, a method of manufacturing the above-mentioned conventional magnetic head will be explained. First, plate-shaped ferrite plates 12a to 12c and 13
A-13c is pre-grooved in a shape corresponding to the gap portion of the magnetic head, and these ferrite plates 12
a to 12c and 13a to 13c are placed in a ceramic frame 1 whose thermal expansion coefficient is smaller than that of the ferrite that is integrally structured around it. The ferrite plates 12a to 12c and 13a to 1 are connected by the small pressurizing screws 2.
Pressure is applied from both sides of 3c through the ceramic plate 10 and the divided ceramic plate 11, respectively. At this time, a welded glass 8 is inserted into the abutting surfaces between the ferrite plates 12a and 13a and between 12b and 13b, and the magnetic head is heated and pressurized perpendicularly to the adhesive surfaces of the ferrite plates 12a to 12c and 13a to 13c. Perform glass welding on the gap area.

[Problems to be Solved by the Invention] Since the above-mentioned conventional magnetic head manufacturing method is carried out as described above, within the ceramic frame l,
The ferrite plate 12 is tightened by the pressurizing screw 2 attached to the
When pressurizing a to 12c and l3a-130 from both sides through the ceramic plate 10 and the divided ceramic plate 11, it is necessary to apply pressure using a plurality of screws 2, so this method is used. Due to the large number of screws 2, it is difficult to make the pressing force uniform, and each ceramic plate 10° 11 to be interposed
Since the plate is flat, the dust is removed from each ceramic plate 10.1.
1 and the ferrite plates 12a, 13c, which poses problems such as the risk of the pressing force being concentrated at one point.

This invention was made to solve the above-mentioned problems, and it is a magnetic head that can uniformly apply pressure force to the ferrite plate even if the number of pressure screws used is small, and is less susceptible to dust. The purpose is to obtain a manufacturing method for.

[Means for Solving the Problems] A method for manufacturing a magnetic head according to the present invention is to place one or more plate-shaped ferrite plates, which have been previously grooved in a shape corresponding to the gap portion of a magnetic head, into a ceramic frame. When applying pressure inside the frame with a screw attached to the frame, pressurize from one side of the ferrite plate through a first ceramic plate having two grooves and a second ceramic plate having one groove, Further, pressure is applied from the opposite side of the ferrite plate via a third flat ceramic plate.

[Function] The method for manufacturing a magnetic head according to the present invention is such that when one or more of the plate-shaped ferrite plates forming the magnetic head is pressurized within a ceramic frame by a screw attached to the frame, the ferrite plate is The first groove has two grooves for
In order to apply the pressing force through the ceramic plate and the second ceramic plate having one groove, the ferrite plate can be uniformly pressed using only one screw.

[Example] FIGS. 1(a) and 1(b) are a plan view and a side view showing a configuration in which a ferrite plate forming a magnetic head is pressurized within a frame in a method for manufacturing a magnetic head which is an example of the present invention. It is a diagram. In the figure, 1 is a ceramic frame, 2 is a pressure screw attached to the frame L, 3 is a first ceramic plate with two grooves, 4 is a second ceramic plate with one groove, and 5 is a flat plate. a third ceramic plate, 6a.

6b and? Numerals a and 7b are plate-shaped ferrite plates forming a magnetic head, and 8 is between the ferrite plates 6a and 7a.

This is a welding glass that welds between the ferrite plates 6b and 7b. Here, the ceramics are A 1203, Ca
It is made from a material such as TiO2, and its coefficient of thermal expansion may be larger or smaller than that of ferrite.

FIG. 2 is a diagram showing the groove shape of the first ceramic plate in FIGS. 1(a) and (b). The first ceramic plate 3 shown in FIG. 2 is provided with two grooves 3a and 3b,
The boundary between grooves 3a and 3b contains W, Ta, and Ti.
A high melting point metal 9 such as the above is heated to about 1000° C. or higher and adhered by solid-to-rough diffusion. The high melting point metal 9 does not necessarily need to be attached, but by attaching the high melting point metal 9 to the boundary between the grooves 3a and 3b, the ferrite plate 6
It becomes possible to pressurize a, 6b and 7a, 7b more uniformly.

Next, a method of manufacturing the magnetic head according to the present invention will be described. First, the plate-shaped ferrite plates 6a, 6b and 7a, 7b are pre-grooved in a shape corresponding to the gap portion of the magnetic head.
), set the third ceramic plate 5 → ferrite plates 6a, 7a, 6b, 7b → first ceramic plate 3 → second ceramic plate 4 in the order of ceramic frame l, and finally Tighten the screw 2 attached to the frame I to apply pressure. At this time, welding glass 8 is inserted between the ferrite plates 6a and 7a and between 6b and 7b, and between the ferrite plates 6a and 7a and between 6b and 7b.
Glass welding is performed at the gap portion of the magnetic head by applying heating and pressure perpendicularly to the adhesive surface between b. After performing the glass welding process to form the gap part of the magnetic head in this way,
The ferrite plates 6a, 6b and 7a, 7b are thinly sliced into chip shapes, thereby manufacturing a magnetic head that fully functions as a magnetic head.

The results of comparing the method of manufacturing the magnetic head of the present invention as described above with the method of manufacturing the conventional magnetic head as described above are summarized in the first section below.
Shown in the table.

Table 1 The above Table 1 shows a comparison between the conventional method and the method of the present invention in which the high melting point metal 9 is attached to the first ceramic plate 3 and the method in which the high melting point metal 9 is not attached in the manufacturing method of the magnetic head. The results are shown in which the defective rate of the gap length of the magnetic head was evaluated when 1000 chips were prototyped.

In the above embodiment, there are four ferrite plates 6a.

Although an example in which 6b, 7a, and 7b are stacked is shown, a larger number of ferrite plates may be stacked, and the same effect as in the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the method for manufacturing a magnetic head of the present invention, one or more of the plate-shaped ferrite plates, which have been grooved in a shape corresponding to the gap portion of the magnetic head, are made of ceramic. When applying pressure within the frame using a screw attached to this frame, the pressure is applied from one side of the ferrite plate through a first ceramic plate having two grooves and a second ceramic plate having one groove. Pressure was applied from the opposite side of the ferrite plate through a third flat ceramic plate, so that only one
Since the ferrite plate can be uniformly pressurized using two screws, the jig can be made at a lower cost compared to the conventional manufacturing method of this type of magnetic head, and the defect rate of the magnetic head can be reduced, resulting in lower costs. This has an excellent effect in that an inexpensive magnetic head can be easily manufactured.

[Brief explanation of the drawing]

1(a) and 1(b) are a plan view and a side view showing a configuration in which a ferrite plate forming a magnetic head is pressurized within a frame in a method for manufacturing a magnetic head according to an embodiment of the present invention; The figure is a diagram showing the groove shape of the first ceramic plate in FIGS. 1(a) and 1(b), and FIG. 3 is an explanatory diagram showing a conventional method of manufacturing a magnetic head. In the figure, -1... Ceramic frame, 2... Screw for pressurization, 3... First ceramic plate, 3a, 3
b...Groove, 4...Second ceramic plate, 5...
Third ceramic plate, 6a, 6b and 7a, 7b...
- Ferrite plate, 8... Welded glass, 9... High melting point metal, 10... Ceramic plate, 11... Divided ceramic plate, 12a to 12c and 13 a to
13 c... Ferrite plate. In addition, the same symbols in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] In a method for manufacturing a magnetic head in which a glass welding process is performed to form a gap portion of a magnetic head, a plate-shaped ferrite plate is pre-processed with a groove in a shape corresponding to the gap portion of the magnetic head, and one or more of the ferrite plates are When applying pressure within a ceramic frame with a screw attached to the frame, one side of the ferrite plate includes a first ceramic plate having two grooves and a first ceramic plate for pressurizing the first ceramic plate. A method of manufacturing a magnetic head, characterized in that pressure is applied through a second ceramic plate having two grooves, and further pressure is applied through a third flat ceramic plate on the opposite side of the ferrite plate.