JPH0244323Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a magnetic head used for recording and reproducing high frequency signals such as television signals.

(b) Prior art In order to densely record high-frequency signals on high coercive force media such as metal tapes, development of magnetic heads whose core bodies are made of magnetic materials with high saturation magnetic flux density, such as sendust and amorphous magnetic materials, has been progressing. ing. It is difficult to increase the width of the medium contacting surface of this core body in order to prevent a reduction in reproduction output due to eddy current loss, so the width is selected to be several tens of microns (for example, about 30 microns) or less, which corresponds to the track width. In order to improve the life characteristics of the magnetic head, in view of the fact that the area of the medium contact surface of this core body is small and that the wear resistance of the material itself is not so high, in conventional examples, one side or both sides of this core body A non-magnetic reinforcing material is applied to the surface. 1st
The figure shows a perspective view of a typical example of a conventional magnetic head of this type. In the figure, 1 is a core body, 2 and 3 are a pair of reinforcing bodies, 4 is a coil window, and 5 is a front gap. The coil to be wound is not shown.

By the way, in this magnetic head, the core body 1
The joining of the reinforcing bodies 2 and 3 is carried out using a fixing jig 6 and moving jigs 7 and 8, as shown in FIG.
That is, as shown in FIG. 2A, the reinforcing body 2, the core body 1,
The reinforcing bodies 3 are arranged one after another, and then the moving jigs 7 and 8
are pressed in the direction of the arrows, aligned as shown in FIG. In the figure, the regulating means in the thickness direction of the magnetic head is omitted. In this process, the core body 1 receives considerable shock when being pushed by the moving jigs 7 and 8, and is easily damaged. In particular, since the moving jig 7 is directly applied to the vicinity of the front gap of the core body, the core halves 11 and 12 that make up the front gap 5 may cause gap enlargement or gap deviation, thereby producing a magnetic head with desired characteristics with a high yield. It was difficult to do so.

(c) Purpose of the invention This invention was made with the above points in mind.
The object of the present invention is to provide a magnetic head with a new structure that can be manufactured with high yield.

(d) Structure of the device The present invention provides a magnetic head in which a reinforcing body is attached to the magnetic path forming surface of the core body, and a V is provided on the side surface of the core body and the reinforcing body adjacent to the tape contact surface and the magnetic path forming surface. The present invention aims to provide a magnetic head in which a character-shaped notch is provided and the two are brought into contact without affecting the front gap of the core body using this notch. Note that this notch is arranged below the coil winding area of the magnetic head (on the back gap side), and is designed to have little effect on the internal magnetic path of the magnetic head.

(E) Embodiment FIG. 3 is a perspective view of the structure of a magnetic head according to the present invention. 1 is a core body made of sendust material,
2 and 3 are reinforcing bodies made of glass material. The core body 1 is sandwiched between reinforcing bodies 2 and 3 and is integrated with an adhesive (not shown) interposed between the abutting surfaces.

The core body 1 is made up of a pair of core halves 11 and 12 having coil winding holes 11a and 12a butted against each other to form the front gap 5, and the tape contact surface 13 has a so-called R shape for consistency with the tape. The thickness 14 is approximately 20 to 30 μm, which corresponds to the track width.

The reinforcing bodies 2 and 3 are formed to have approximately the same external shape as the core body 1, except that each of the reinforcing bodies 2 and 3 has a thickness of approximately 60 to 100 μm. It has rounded tape contact surfaces 21, 31, and the holes 11a,
It is provided with through holes 22 and 32 that are continuous to 12a.

Both the core body 1 and the reinforcing bodies 2 and 3 are arranged in a V-shape (wedge shape) on the lower side (back gap side) of the coil winding area 15 on the side surface S adjacent to the tape contact surface and the magnetic path forming surface. Cutouts 16, 23, and 33 are provided. One surface 16 forming each notch
a, 23a, and 33a are arranged on one surface.

Figure 4 explains the process of joining the core body and the reinforcing body (in both cases before the tape contact surface is formed), Figure A shows the state before alignment, and Figure B shows the state after alignment. There is. As shown in FIG. 4A, the reinforcing body 2, the core body 1, and the reinforcing body 3 are roughly arranged in sequence on the side surfaces 61 and 62 of the fixing jig 6, and then the V-shaped notch is The moving jig 9 having the convex portion 91 is pressed. The parts 92 and 93 of the moving jig 9 and the surface of the magnetic head facing the same are brought into contact with each other, while the parts 94 and 95 of the moving jig 9 and the surface of the magnetic head facing the same are kept apart, Jig 9
The stress from the magnetic head is applied only to the back gap side of the magnetic head. In the figure, the moving jig is shown accessing the magnetic head obliquely from above, but it may also be accessed from the side.

The core bodies 1 are aligned as shown in Figure 4B.
An adhesive is introduced between the reinforcing bodies 2 and 3, solidified and integrated, and then the tape abutting surface is formed to obtain the magnetic head shown in FIG.

FIG. 5 shows the process of attaching the magnetic head to the base. The magnetic head H is placed at a certain distance P from the side surface _B1 and the plane _B2 of the head base B, respectively.
However, for the magnetic head with the notch mentioned above, this positioning can be done using fixing jigs J ₁ and J ₂ and moving jig J ₃ , making it unnecessary for the front gear. It does not cause any stress.

(f) Effects of the invention This invention is constructed so as not to apply undesirable stress to the area around the front gear of the core body when aligning the core body and the reinforcing body.
The occurrence of defective products during the manufacturing process can be significantly reduced, and high-quality magnetic heads can be provided at low prices, making it practical.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the configuration of a conventional magnetic head;
Figures A and B are explanatory diagrams of the manufacturing process. FIG. 3 is a perspective view of the structure of one embodiment of the present invention, FIGS. 4A and 4B are illustrations of the manufacturing process, and FIG. 5 is an illustration of the installation process to the magnetic head base. Explanation of main drawing numbers, 1... core body, 2, 3...
Reinforcement body, 16, 23, 33...V-shaped notch.

Claims (1)

[Claims for Utility Model Registration] (1) In a magnetic head comprising a core body having a thickness corresponding to the track width and a reinforcing body attached to a magnetic path forming surface of the core body, the core body A magnetic head characterized in that a V-shaped notch is provided on a side surface adjacent to the bonding surface of the reinforcing body and the tape abutting surface. (2) The core body is made up of a pair of core halves made of a metal magnetic material butted against each other, and the notch is arranged below the coil winding area (on the back gap side) with respect to the core body. A magnetic head according to claim (1) of the utility model registration, characterized in that: