JP2510120Y2 - Composite type magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a magnetic head used for a rotary head of a video tape recorder, a digital audio tape recorder, or the like.

[Conventional technology]

Conventionally, as a composite type magnetic head used for a rotary head, for example, one shown in a schematic front view of FIG. 3 is known.

As shown in the figure, the conventional composite magnetic head 1 is formed by joining a core half 2 and a core half 3 made of ferrite to each other with a glass material 8.

At the time of this joining, winding halves 4a and 4b are provided in the core halves 2 and 3, respectively. A magnetic film 7 made of a ferromagnetic material is provided on the joint surface at a portion forming the gap 5 of the magnetic head 1 and a portion forming the winding window 6 by an attaching means such as vapor deposition.

The core halves 2 and 3 are made of the glass material 8 and the magnetic film 7 is formed.
Are joined to face each other, and a winding (not shown) is applied to the winding window 6 in a state where the winding window 6 is formed so that the winding window 6 acts as the composite magnetic head 1.

[Problems to be solved by the device]

However, in the conventional composite magnetic head 1 described above, the winding window 6 formed by joining the core halves 2 and 3 has the magnetic film 7 around the entire inner wall thereof. The magnetic film 7 is exposed,
The glass material 8 for joining is simply covered and protected in the vicinity of the gap 5, and the other parts are not protected.

Therefore, when the winding is applied, the magnetic film in the winding window 6 causes film peeling due to impact at the time of winding, which causes a problem that magnetic flux efficiency is deteriorated and characteristics are deteriorated. Was there.

The present invention was devised for the purpose of preventing peeling of the magnetic film in this composite type magnetic head to prevent deterioration of characteristics.

[Means and Actions for Solving the Problems]

In view of the above-mentioned problems, the present invention provides, as a means for solving the problems, a composite magnetic head in which a magnetic film is provided around the gear half formation surface of the core half-body joint surface and the entire circumference of the winding window inner wall. The entire magnetic film located on the inner wall of the winding window is covered with a heat-resistant resin, and the core halves are joined with a glass material.

Then, by protecting the entire surface of the magnetic film around the inner wall of the winding window, peeling of the magnetic film is prevented, and the magnetic flux efficiency in the magnetic head is improved.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic front view of a composite magnetic head according to the present invention, and FIG. 2 is an enlarged view of a main part thereof.

In the figure, 10 is a composite magnetic head, 11 and 12 are a pair of core halves made of ferrite, 13a and 13b are winding grooves formed in the core halves 11 and 12, and 14 is each core half 11 , 12
The magnetic film of a ferromagnetic material adhered and formed on the gap forming surface of the joint surface and the entire circumference of the winding window inner wall by means such as vapor deposition, 15 is a gap formed by joining the core halves 11 and 12, 16
Is a heat-resistant resin film provided on the entire surface of the magnetic film 14 to protect the magnetic film 14 located on the inner wall of the winding window 17 formed by the winding groove 13a.

That is, in the composite magnetic head 10 of the present invention, after forming the winding grooves 13a and 13b in the respective core halves 11 and 12,
The magnetic film 14 is adhered and formed on the entire bonding wall forming the gap 15 and the inner wall of the groove 13a forming the winding window 17. Subsequently, the entire surface of the magnetic film 14 in the inner portion of the winding window 17 is covered with a heat resistant resin 16 and then bonded by a glass material 18 to form the structure.

[Effect of device]

Therefore, as described above, in the composite magnetic head according to the present invention, the entire surface of the magnetic film located on the entire circumference of the inner wall of the winding window is covered with the heat-resistant resin to protect it. When performing the work, it is possible to prevent the magnetic film from being peeled off by the winding.

Since the magnetic film is left on the entire circumference of the inner wall of the winding window, the magnetic flux passing through the gap of the composite magnetic head acts as a high-density magnetic flux, and the magnetic flux efficiency of the composite magnetic head is improved. -The effect that the reproduction characteristics can be improved can be obtained. In addition, since the entire circumference of the inner wall of the winding window is protected by the resin, it is possible to obtain the effect of preventing insulation failure of the winding during winding.

[Brief description of drawings]

FIG. 1 is a schematic front view showing an embodiment of the present invention, FIG. 2 is an enlarged view of a main part of its winding window, and FIG. 3 is a schematic front view showing a conventional example. 10 …… Composite magnetic head, 11,12 …… Core half, 13a, 1
3b: Groove for winding, 14: Magnetic film, 15: Gap, 16
…… Heat-resistant resin, 17 …… winding window, 18 …… glass material.

Claims (1)

(57) [Scope of utility model registration request] 1. In a composite magnetic head having a magnetic film disposed on the gap forming surface of a core half joint surface and the entire circumference of a winding window inner wall, the entire surface of the magnetic film located on the winding window inner wall of the magnetic head is covered. A composite magnetic head characterized in that it is covered with a heat-resistant resin, and the core halves are joined together with a glass material.