JPS6029912A - Magnetic head core - Google Patents

Abstract

PURPOSE:To obtain a magnetic head core which is easily processed with no waste of a magnetic core material by holding a magnetic core source body having no flange part for fastening of winding between reinforcing plate having said flange parts and filling a filler between the opposite flange parts of the reinforcing plates. CONSTITUTION:A winding window 8a is formed at a position opposite to a winding groove 6a of reinforcing plates 8, and notches 8a are provided at the right and left side edges near the upper end of the plate 8 to form a flange part where the winding is fastened. The groove 6a is fitted to the window 8a, and the outside edges of core halves 6 and 6 are set at the bottom sides of notches 8b and 8b respectively. Then both plates 8 are bonded to each other to form a sandwich structure holding halves 6 and 6 in-between. Thus a gap is produced between the opposite flange parts of the plates 8. Then a filler 9 of a nonmagnetic material is filled between the flange parts of the plates 8 and 8 bulged outside from the outer side edges of the halves 6 and 6. Then a magnetic head core 10 is obtained.

Description

TECHNICAL FIELD The present invention relates to a magnetic head core, and more particularly to a magnetic head core used in a video tape recorder for recording and reproducing images.

Prior Art - Generally, magnetic heads for recording and reproducing images used in video tape recorders mainly use ferrite, but when using magnetic recording media with high coercive force such as metal tape, it is sufficient. In order to obtain good recording and reproducing characteristics, a [Delta] material with a high saturation magnetic flux density, such as Senges.

In order to suppress the eddy current loss of materials with high saturation magnetic flux density, such as Sarawoko Sendust, these materials must be made extremely thin, making it difficult to form the core from a single magnetic material.

Therefore, in the case of a core using such a thin material, a reinforcing plate is required to reinforce the core, and it is necessary to make the core and the reinforcing plate the same shape.

The conventional manufacturing method of this type of magnetic head is shown in FIGS. 1 and 2.
As shown in the figure.

In Figures 1 and 2, the reference numeral 1.1 indicates core half-holes, and these core half-holes are formed by thinly slicing a material with a high saturation magnetic flux density, such as sendust, as described above, and are placed abutting against each other. ru°.

First, in FIG. 1, since these core halves 1.1 are extremely thin, reinforcing plates 2 and 3 are stacked on both sides thereof.

These reinforcing plates 2.3 have the same shape as the core half-holes 1.1 placed against each other, and each has a winding window at a position corresponding to the winding groove 1a formed between the core half-holes 1.1. 2a and 3a are formed.

``The core halves 1 are arranged in this way.
, 1 and 1. By overlapping and joining reinforcing plates 2 and 3 having the same size as those of 1, a winding wire (not shown) is formed on the side edge of one core 4 before notching, including the side edge of the core half-opened 1.1. A notch 5 is formed in order to create a flange for locking to prevent it from slipping.

However, if such a manufacturing method is adopted, the notch part 5 must be formed including the side edge of the core half-hole 1.1, and the three overlapped parts (A) will have to be cut, which will require processing. Not only is it difficult to do this, but also the side edges of the core halves 1, 1 are also cut off (1 material is wasted).

1. The present invention was made in order to eliminate the above-mentioned drawbacks of the conventional method, and aims to provide a magnetic headco Z that simplifies the manufacturing process and eliminates waste of the core 41 material. .

Example Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 3 and subsequent figures illustrate the present invention, and FIGS. 3 and 4 show the structure of a core body and a reinforcing plate to which the present invention is applied. That is, the core halves 6.6 made of a material with a high saturation magnetic flux density such as sendust are butted and joined. A winding groove 6a is formed in one core half 6, and the upper end of the winding groove 6a in FIG. 3 is filled with a joining member 7 such as glass to join the core half 6.6. .

The width of the entire core element body integrated in this manner is assumed to be 1.

On the other hand, the reinforcing plate 8 is formed as shown in FIG.

That is, the reinforcing plate 8 as a whole has approximately the same size as the butted magnetic core elements shown in FIG. 3, but the overall width is f-1-7Δ,1, Body width! larger than

A winding window 8a is formed in the reinforcing plate 8 at a position facing the winding groove 6a, and fleas on the left and right side edges near the ends are for locking the winding. To make the tsuba of
The notch 8b is shaped like JL'. ? In other words, the flange is formed at the lower end of the notch 8b.

The depth of these notches 8b is Δ1/2.

Therefore, when the butted core body and reinforcing plate 8 are stacked together as shown in FIG.
Coincides with the outer edge of 6.

To obtain the reinforcing plate 8 having the shape of two continuous plates, first prepare a rectangular reinforcing plate material 8C as shown in FIG. 6, and then perform etching, ultrasonic processing, etc. As shown in FIG. 7, the winding window 8a,
A notch 8b is formed, and an arcuate portion 8 (l) is formed on the magnetic recording medium sliding surface side.

In addition to the method of obtaining one reinforcing plate one by one from one reinforcing plate plate (:/18c) as shown in Figs. Prepare the board material,
Alternatively, a method may be adopted in which a large amount of reinforcing plates are obtained at one time by processing by etching, etching, or ultrasonic processing.

The magnetic core body is joined to the side surface Q of the reinforcing plate 8 thus obtained as shown in FIG.

At this time, the winding groove 6a and the winding window 8a are aligned, and the outer edges of the core half-holes 6.6 are aligned with the bottom sides of the notches 8b, 8b, respectively.

Next, as shown in FIG. 9, another reinforcing plate 8 is joined across the core half-hole 6.6 to form a sandwich structure. This creates a gap between the opposing flanges of the reinforcing plate 8.8.

Then, as shown in FIG. 10, a filler 9 made of a non-magnetic material is filled between the opposing flanges of the reinforcing plate 8.8 protruding outward from the outer edge of the core half-hole 6.6, and the magnetic core is Get IO.

Since this embodiment is constructed as follows, the reinforcing plate 8
Since a notch is formed in advance so that the bottom side of the core half-hole matches the outer edge of the core half-hole 6.6, three members including the magnetic core half-hole sandwiched between two reinforcing plates as in the conventional case. It is no longer necessary to form a notch on the side edge of the core body consisting of the core body, and there is no waste of material such as cutting out the side edge of the core body.

In addition, in the embodiment described in -16 [here, a method of stacking half the cores bonded to one reinforcing plate was shown, but the magnetic core element was placed on the surface of the continuous large-area reinforcing plate A 4. A large number of rad cores may be bonded at predetermined intervals, a large-area reinforcing plate may be superimposed and bonded thereon, and then the magnetic rad cores may be cut one by one.

Effects As is clear from the above explanation, according to the present invention, between the plurality of reinforcing plates (two windings 11-
The magnetic core element, which does not form a flange, is sandwiched between the reinforcing plates, and a filler is filled between the opposing flange parts of the reinforcing plate, so processing is easy and there is no waste of magnetic core material. You can obtain a magnetic rad core.

[Brief explanation of drawings]

Figures 1 and 2 illustrate a conventional magnetic helad core. Figure 1 is a perspective view of the core body and reinforcing plate before processing;
Fig. 2 is a perspective view of the core body and reinforcing plate after processing, Figs. 3 to 10 are for explaining the present invention, Fig. 3 is a plan view of the core halves that have been butted together, and Fig. 4 is the reinforcing plate. Planar view of the board,
Figure 5 is a plan view of the reinforcing plate stacked on the core body;
The figure is a perspective view of the reinforcing plate material, FIG. 7 is a perspective view of a completed reinforcing plate, and FIGS. 8 to 10 are perspective views showing the manufacturing process of the magnetic herad core. 6... Core half 6a... Winding groove 7... Joint portion 8... Reinforcement plate 8a... Winding window 8b... Notch 8c... Reinforcement plate plate 41 9 ...Filler 10...
Magnetic head core Figure 8 8゜

Claims (1)

[Claims] A magnetic core element without a winding locking collar is sandwiched between a plurality of reinforcing plates each having a winding locking collar, and a filler is filled between opposing collars of the reinforcing plates. A magnetic core that is characterized by the following.