JPS60164910A - Manufacture of magnetic head for vtr - Google Patents

Abstract

PURPOSE:To form a circular arcuate face in a direction orthogonal to the magnetic tape running direction and in a magnetic tape running direction of a head element by sliding a polishing tape to the head element and also and shaking the head element perpendicularly in the running direction of the polishing tape to attain polishment. CONSTITUTION:In order to form a face of a large radius R in the magnetic tape running direction A to a magnetic tape running face 2 of an assembly 1 by a circular grinding wheel 11 whose polishing face 11a is flat, the assembly 1 fixed to a fitting base 12 is polished while being shaken in the same direction as the running direction A so as to form a head element body 13. Then a fitting jig 15 fixed with it is moved and a magnetic tape running face 2 of the head element 13 is pressed onto the polishing face of the polishing tape 5. Then the polishing tape 5 is reciprocated in the same direction as the magnetic tape running direction A of the head element 13 and the head element 13 is shaken perpendicularly in the running direction of the polishing tape 5. Then a face with a small radius (r) is formed in the direction B orthogonal to the magnetic tape running direction A with a depth (t) of the recessed part.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a method of manufacturing a magnetic head for a VTR.

[Background of the invention]

The first method for manufacturing a conventional VTR magnetic head is as follows.
It was as shown in Figures 4 to 4.

That is, the magnetic head assembly 1 shown in FIG. 1 has a magnetic tape running surface 2 as shown in FIG. 2 in the polished state.
A surface with a large radius hole is formed in the magnetic tape running direction A, and a surface with a large radius hole is formed in the direction B perpendicular to the magnetic tape running direction A.
This is to form a surface with a small radius r.

As a method of manufacturing the magnetic head assembly 1 shown in FIG. 1 into the head body 6 shown in FIG. 2, first, as shown in FIG. The assembly 1 is polished along a trajectory indicated by a chain line 0. However, polishing only with the shaped grindstone 4 produces a rough finish on the magnetic tape running surface 2, and since the edge portion 2α forms an acute angle as shown in FIG. 2, polishing with the polishing tape 5 as shown in FIG. 4 is necessary. It is a completed magnetic head product.

In other words, this polishing process requires either an actual VTR device or a VTR device.
A device having a configuration similar to the TR device is used, and a fine-grained abrasive tape 5 or VTR tape is used, and a pair of tension rollers 8 are installed between a take-up reel 6 and a feed reel 7.
. The amount of polishing is determined by pushing in gradually. By running the polishing tape 5 in a fixed direction, the magnetic tape running surface 2 of the head element 6 is finished polished.

However, with the above-mentioned conventional manufacturing method, it is not possible to polish a large number of magnetic heads at once, the polishing time is long, the cost is high, and a large number of polishing devices are required for mass production. It has the disadvantage that it is difficult to control the amount of polishing, and it is difficult to produce magnetic heads of the same quality, making it difficult to mass-produce.

There is also the problem that polishing tape is consumed a lot because it is mounted and polished.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a magnetic head for a VTR, which eliminates the drawbacks of the conventional manufacturing method described above and allows easy polishing of a large number of magnetic heads at one time.

[Summary of the invention]

In order to achieve this object, the present invention presses a plurality of head bodies against the abrasive surface of a relatively wide tensioned abrasive tape to appropriately bend the abrasive tape, and then attaches the abrasive tape to the head body. By polishing the head body by sliding it against the magnetic tape and swinging the head body in a direction perpendicular to the running direction of the abrasive tape, the magnetic tape running direction of the head body is perpendicular to the magnetic tape running direction. It is characterized by forming an arcuate surface in the direction of

(Example of the invention) A first embodiment of the present invention will be described with reference to FIGS. 5 to 8.

The same members as those explained in FIGS. 1 to 4 are given the same reference numerals.

First, as shown in FIG. 5, in order to form a surface with a large radius in the magnetic tape running direction A on the magnetic tape running surface 2 of the assembly 1 using a circular grindstone 11 whose polishing surface 11α is flat, the mount 12 is used. The head body 13 is formed by swinging the assembly 1 fixed to the head in the same direction as the running direction A and polishing it.

Next, the abrasive tape 5, which is wider than the conventional abrasive tape, is placed in the abrasive device 14 as shown in FIG. let Then, the head body 16 is fixed to a plurality of mounting jigs 15, and the mounting jigs 15 are moved to press the magnetic tape running surface 2 of the head body 16 against the polishing surface of the polishing tape 5. Then, this abrasive tape 5 is reciprocated in the same direction as the magnetic tape running direction A of the head element 16, and the head element 16 is moved in a direction perpendicular to the running direction of the abrasive tape 5 (orthogonal to the magnetic tape running direction A). Direction B)
oscillate. Then, due to the abrasive tape 5 stretched between the tension rollers 8 and 9 and the amount of protrusion of the head body 16, a surface with a large radius in the magnetic tape running direction A is formed as in the completed magnetic head 16 shown in FIG. formed, and furthermore,
As shown in FIG. 7, the depth t of the four parts formed on the polishing tape 5 results in a surface with a small radius r in the direction B perpendicular to the running direction A of the magnetic tape, as shown in the completed magnetic head 16 shown in FIG. will be formed.

The amount of polishing is determined by the tension of the polishing tape 5 and the amount of protrusion of the head body 16.

The abrasive tape 5 is made of a polyester material with abrasive grains supporting the abrasive surface, and by starting with a roughness of 600 to 1000 and finishing with a roughness of 8000 to 10,000, a magnetic head with a clean finish can be obtained. is obtained.

A second embodiment is shown in FIGS. 9 and 10. The same members as in the first embodiment are given the same reference numerals and explanations are omitted, but in this embodiment, the head element 16 between the tension rollers 8 and 9
A second tension roller 17 is arranged at a position opposite to the second tension roller 17.

As shown in FIG. 10, the second tension roller 17 has a comb-tooth cross section 17α on its circumference. According to this method, the tension of the abrasive tape 5 is more effectively applied to the head body 16. Since the magnetic field is applied, it is easy to clearly form a surface with a radius r similar to the front handle of the head body 13, and a magnetic head with better finishing accuracy can be provided.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to manufacture a large number of magnetic heads at the same time with the same precision, and it is possible to provide a method for manufacturing magnetic heads for VTRs that is extremely effective in mass production.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a conventional magnetic head assembly;
The figure is a perspective view showing a conventional head body, FIG. 6 is an explanatory diagram showing the polishing process of the conventional assembly, FIG. 4 is an explanatory diagram showing the polishing process of the conventional head body, and FIG. 5 is the main body. 6 and 7 are explanatory diagrams showing a first embodiment of the polishing process of the head body of the present invention, and FIG. 8 is a completed magnetic head product of the present invention. A perspective view showing FIG. 9, 1st
FIG. 0 is an explanatory diagram showing a second embodiment of the head material polishing process of the present invention. 5... Polishing tape, 16... Head body, A...
Magnetic tape running direction, B...direction perpendicular to the magnetic tape running direction, R2r...radius of circular arc surface. Figure 1 Figure 2 Figure 5 Figure 6 Figure 7 Cause Figure 8 tX/'A

Claims (1)

[Claims] A plurality of head bodies are pressed against the abrasive surface of a relatively medium-wide abrasive tape under tension to bend the abrasive tape appropriately, and the abrasive tape is slid against the head body, and the head body is By polishing the head body by swinging it in a direction perpendicular to the running direction of the polishing tape, an arc-shaped surface is formed in the head body in the magnetic tape running direction and in a direction orthogonal to the magnetic tape running direction. A method of manufacturing a magnetic head for a VTR, characterized in that: