JPH0341885B2 - - Google Patents

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 conventional method of manufacturing a magnetic head for a VTR is as shown in FIGS. 1 to 4.

That is, the magnetic head assembly 1 shown in FIG.
In the polished state, as shown in FIG. 2, a surface with a large radius R is formed in the magnetic tape running direction A on the magnetic tape running surface 2, and a small radius R is formed in the direction B perpendicular to the magnetic tape running direction A. This forms a surface with radius γ.

As a method of manufacturing the magnetic head assembly 1 shown in FIG. 1 to the head body 3 shown in FIG. 2, first, as shown in FIG.
The assembly 1 is polished by drawing a locus shown by a two-dot chain line C using a polishing machine. However, polishing using only the forming whetstone 4 results in a rough finish on the magnetic tape running surface 2, and as shown in FIG.
Since a forms an acute angle, a polishing process is performed using a polishing tape 5 as shown in FIG. 4 to obtain a completed magnetic head.

That is, this polishing process uses an actual VTR device or a device with a configuration similar to a VTR device, and uses fine-grained abrasive tape 5 or VTR tape to connect the take-up reel 6 and the feed reel 7. A pair of tension rollers 8 and 9 are arranged between them to apply a certain tension to the abrasive tape 5, and the head body 3 fixed to the mounting base 10 is pushed out onto the abrasive tape 5 in this state. The polishing tape 5 is gradually pushed in so as to be appropriately bent, and the amount of polishing is determined by the amount of pushing. By running the polishing tape 5 in a fixed direction, the magnetic tape running surface 2 of the head body 3 is finished polished.

However, in the conventional manufacturing method described above,
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 to produce large quantities.
Another disadvantage is that it is difficult to control the amount of polishing, and magnetic heads of the same quality cannot be easily produced, making mass production difficult. There is also the problem that a large amount of polishing tape is consumed since the device 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 a large number of magnetic heads to be easily polished at one time.

[Summary of the invention]

A tension roller having a comb tooth-shaped cross section on the circumference is provided, and a plurality of head elements are arranged in recesses between the comb tooth shapes of the tension roller,
An abrasive tape is interposed between the tension roller and the plurality of head elements, and the plurality of head elements are pressed against the abrasive surface of the abrasive tape, and the abrasive tape is pressed against the tension roller, and the abrasive tape is pressed against the tension roller. The abrasive tape is appropriately bent into the recess, and the abrasive tape is slid against the head element, and the head element is swung in a direction perpendicular to the running direction of the abrasive tape to absorb the magnetic field of the head element. It is characterized by forming arcuate surfaces in the tape running direction and in a direction perpendicular to the magnetic tape running direction.

[Embodiments 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 R 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 11a is flat, the mount 12 is used. The head body 13 is formed by polishing the assembly 1 fixed to the head body 1 while swinging it in the same direction as the running direction A.

Next, an abrasive tape 5 that is wider than conventional abrasive tape is placed in a polishing device 14 as shown in FIG. 6, and a pair of tension rollers 8 and 9 are arranged between a take-up reel 6 and a feed reel 7. Make me nervous. Then, the head element 13 is fixed to a plurality of mounting jigs 15, and the mounting jigs 15 are moved, and the head element 13 is fixed to a plurality of mounting jigs 15.
The magnetic tape running surface 2 of is pressed against the polishing surface of the polishing tape 5. Then, the abrasive 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 moved back and forth by the abrasive tape 5.
(direction B perpendicular to the magnetic tape running direction A). Then, the abrasive tape 5 stretched between the tension rollers 8 and 9
Due to the amount of protrusion of the head body 13, a surface with a large radius R in the magnetic tape running direction A is formed as in the completed magnetic head 16 shown in FIG.
As shown in FIG. 7, depending on the depth t of the recess formed in the abrasive tape 5, the completed magnetic head 16 shown in FIG. A surface 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 13.

The abrasive tape 5 is made of polyester material with abrasive grains supporting the abrasive surface, and initially has a roughness of 600~
By starting with No. 1000 and finishing with No. 8000 to 10,000, you can obtain a magnetic head with a clean finish.

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; however, in this embodiment, tension rollers 8, 9
A second tension roller 17 is disposed at a position facing the head body 13 between the two.

As shown in FIG. 10, the second tension roller 17 has a comb-like cross section 17a on its circumference, and is positioned in a recess 17b between the comb-like shapes 17a of the tension roller 17. A plurality of head bodies 13 are arranged, and the tension roller 17
An abrasive tape 5 is interposed between the head elements 13 and the abrasive tape 5, and the abrasive tape 5 is pressed against the polished surface of the abrasive tape 5.
is pressed against the tension roller 17, and the abrasive tape 5 is pressed against the tension roller 17.
This abrasive tape 5 is bent appropriately into the recess 17b.
is slid against the head element 13, and the head element 13 is swung in a direction perpendicular to the running direction of the abrasive tape 5, so that the magnetic tape running direction of the head element 13 is perpendicular to the magnetic tape running direction. form an arc-shaped surface in the direction of According to this method, more tension of the abrasive tape 5 is applied to the head element 13, so that the surface of the head element 13 with the small radius γ is easily formed clearly, and a magnetic head with better finishing accuracy can be obtained. Can be provided.

〔Effect of the invention〕

As explained above, according to the present invention, the arcuate surface to be formed can be freely adjusted by adjusting the amount of pressure applied to the concave portion of the tension roller and the head body, and the deflection of the abrasive tape is stabilized. This eliminates variations in processing accuracy and makes it easy to replace and move the abrasive tape. Therefore, a large number of magnetic heads can be manufactured at the same time with the same precision, making it ideal for VTRs with extremely high mass production efficiency. A method of manufacturing a magnetic head can be provided.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a conventional magnetic head assembly, Fig. 2 is a perspective view showing a conventional head element body, Fig. 3 is an explanatory view showing the polishing process of the conventional assembly, and Fig. 4 is a perspective view showing a conventional magnetic head assembly. FIG. 5 is an explanatory diagram showing the polishing process of the conventional head body. FIG. 5 is an explanatory diagram showing the polishing process of the assembly of the present invention. FIGS. FIG. 8 is a perspective view showing a completed magnetic head product of the present invention; FIGS. 9 and 10 are explanatory views showing a second embodiment of the head material polishing process of the present invention. . 5...Abrasive tape, 13...Head body, A...
... Magnetic tape running direction, B... Direction perpendicular to the magnetic tape running direction, R, γ... Radius of circular arc surface.

Claims (1)

[Claims] 1. A tension roller having a comb tooth-shaped cross section on the circumference is provided, a plurality of head bodies are arranged in recesses between the comb tooth shapes of the tension roller, and the tension roller and the plural head An abrasive tape is interposed between the head element and the head element, and a plurality of head elements are pressed against the abrasive surface of the abrasive tape.
pressing the abrasive tape against the tension roller to appropriately deflect the abrasive tape into the recess;
This abrasive tape is slid against the head element, and the head element is swung in a direction perpendicular to the running direction of the abrasive tape, so that the magnetic tape running direction of the head element is perpendicular to the magnetic tape running direction. It is characterized by forming an arc-shaped surface in the direction of
A method of manufacturing magnetic heads for VTRs.