JP2536190Y2 - Partial magnetizing device for manufacturing erase 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 partial magnetizing device for manufacturing an erasing head used for partially magnetizing a permanent magnet erasing head for erasing contents recorded on a magnetic tape.

[0002]

2. Description of the Related Art Conventionally, the magnetization of a magnet erasing head is
This is performed by using an electromagnet having a gap as shown in FIGS. 1 and 2 of JP-A-53-62517.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel partial magnetizing device for manufacturing an erase head which is different from the magnetizing method described in the prior art.

[0004]

In order to achieve the above object, a partial magnetizing device for manufacturing an erasing head according to the present invention comprises a first projecting wall 1, a second projecting wall taller than the first projecting wall 1. A third protruding wall 3 having the same height as the wall 2 and the second protruding wall 2 and a fourth protruding wall 4 shorter than the third protruding wall 3 are protruded to form a first concave groove 5, a second concave groove 6, and A first copper strip 9 having a width larger than the height of the first protruding wall 1 and smaller than the height of the second protruding wall 2 is formed in the first groove 5.
And a second copper band 10 and a third copper band 11 having the same width as the height of the second protruding wall 2 are fitted into the second groove 6 and the third groove 7, respectively. In each of the copper strips 9, 10, and 11, an insulating coating 12 is applied around the locations existing in the first to third grooves 5, 6, and 7, and the second and third copper strips 10, 1 are provided.
One end 13, 14 of each other and the first to third copper strips 9, 10,
11, the other ends 15, 16, 17 are short-circuited with each other, the first connection terminal 19 is connected to the short-circuited end between the one ends 13, 14 of the second and third copper strips 10, 11, and the first copper strip 9 is connected. Second on one end
A connection terminal 20 is provided.

[0005]

In the embodiment shown in the drawings, a first protruding wall 1, a second protruding wall 2 taller than the first protruding wall 1, and a third protruding wall 2 having the same height as the second protruding wall 2 are provided on the upper surface of a soft iron block. Protruding wall 3 and third
A yoke 8 is formed by projecting a fourth protruding wall 4 shorter than the protruding wall 3 and forming a first concave groove 5, a second concave groove 6, and a third concave groove 7 on the upper surface. First protrusion wall 1 in groove 5
A first copper band 9 having a width larger than the height of the second protruding wall 2 and a width smaller than the height of the second protruding wall 2, and a second copper Band 10 and third copper band 1
1 are respectively fitted, and these first to third copper strips 9, 10,
At 11, an insulating coating 12 made of a synthetic resin tube is applied around the portions existing in the first to third concave grooves 5, 6, 7, and one ends 13, 14 of the second and third copper strips 10, 11 are connected to each other. 1-3, other ends 15, 16, 1 of copper strips 9, 10, 11
7 are short-circuited with one screw 22 respectively.
The first connection terminal 19 was fastened to the short-circuit end between the one ends 13 and 14 of the third copper strips 10 and 11, and the second connection terminal 20 was fastened to one end of the first copper strip 9 with screws 23 and 24, respectively. Things.

[0006]

An example of how to use the device of the present invention will be described with reference to the drawings. That is, first, an isotropic ferrite magnet erasing head main body 26 in which the entire surface of the tape sliding arc is magnetized with an S-pole of 600 Gauss in the previous step is obtained. Thereafter, one of the erasing head main bodies 26 is placed on the apparatus of the present invention as shown in FIG. 1 and is pressed and held with iron tweezers 27 or a shaft made of the same. In this holding state, by turning on a foot switch (not shown) of a magnetized power supply (not shown) previously set and connected to the first connection terminal 19 and the second connection terminal 20, A high pulse current is applied to the first to third copper strips 9, 10, and 11 only for an instant, and the first to third copper strips 9, 1 and 11 are applied.
A high magnetic field is generated around 0 and 11, and by making the magnetic field higher, partial magnetization places 28 and 29 for improvement are provided on both side surfaces of the erasing head main body 26 to obtain a completed product 30. In this case, a holding portion made of tweezers or the like pulls the magnetic force lines 31 to form the partially magnetized portions 29. According to actual measurement, the surface of the partial magnetization location 28 was S1000 gauss, and the surface of the partial magnetization location 29 was S600 gauss. Next, the completed product 30 is detached from the device of the present invention, and is subjected to a usage such as repetition of a partial magnetization operation on the next erasing head main body.

FIG. 3 is a Gaussian curve shown in a state corresponding to the magnetized portion (tape contact portion) of the completed product 30. The completed product 30 has an improved erasing rate, improved distortion rate,
Reduction of stop noise, reduction of erasing noise, S / N
The characteristics have been improved.

[0008]

The partial magnetizing device for manufacturing an erase head according to the present invention is as described above. Therefore, a partial magnetizing device for manufacturing a new erase head which is different from the magnetizing method described in the prior art described above. This has the effect of completely achieving the intended purpose of providing the device.

[Brief description of the drawings]

FIG. 1 is a front view of a main part showing an embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a Gaussian curve of a completed product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st protruding wall 2 2nd protruding wall 3 3rd protruding wall 4 4th protruding wall 5 1st groove 6 2nd groove 7 3rd groove 8 yoke 9 1st copper band 10 2nd copper band 11 3rd Copper strip 12 Insulation coating 19 Connection terminal 20 Connection terminal 26 Erase head body 27 Tweezers 28 Partially magnetized part 29 Partially magnetized part 30 Completed product

Claims (1)

(57) [Scope of request for utility model registration] 1. A first protruding wall 1, a second protruding wall 2 taller than the first protruding wall 1, a third protruding wall 3 having the same height as the second protruding wall 2, and a back protruding from the third protruding wall 3. A yoke 8 having a first concave groove 5, a second concave groove 6, and a third concave groove 7 formed on the upper surface by protruding a lower fourth protruding wall 4 is formed.
A first copper band 9 having a width larger than the height of the second protruding wall 2 and a width smaller than the height of the second protruding wall 2, and a second copper Band 10 and third copper band 1
1 are respectively fitted, and these first to third copper strips 9, 10,
At 11, an insulating coating 12 is applied around the locations existing in the first to third concave grooves 5, 6, 7, and one end 13, 14 of the second and third copper strips 10, 11 and the first to third copper strips. The other ends 15, 16, 17 of the bands 9, 10, 11 are short-circuited to each other, and the first connection terminal 19 is connected to the short-circuited ends of the ends 13, 14 of the second and third copper bands 10, 11, respectively. (1) A partial magnetizing device for manufacturing an erase head, wherein a second connection terminal (20) is provided at one end of a copper band (9).