JPH0430645Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a shield cover mounting structure for a magnetic head, and particularly to a shield cover mounting structure for a large magnetic head such as an audio magnetic head for a VTR.

[Background of the idea]

Conventionally, a magnetic head assembly consisting of a recording/playback magnetic head (hereinafter referred to as a recording/reproduction magnetic head) called an audio magnetic head for VTRs and an erasing magnetic head has been designed to be unaffected by external magnetic fields. A shield cover is attached to the

FIG. 3 is an exploded perspective view showing a shield cover mounting structure of a conventional audio magnetic head for a VTR.

In the drawings, 1 and 2 are magnetic heads, for example 1
2 is a magnetic head for recording/reproducing, and 2 is a magnetic head for erasing.
2a are combined to form a magnetic head assembly A.

Reference numeral 3 denotes a shield cover made of permalloy, for example, which covers the magnetic head assembly A, and a top plate that covers the upper surfaces 1a 1 and 2a 1 of the shield cases 1a and 2a of the recording/reproducing magnetic head ₁ and the erasing magnetic head ₂ . 3
a, and a back plate 3b that is engaged with the back faces 1a ₂ and 2a ₂
and a side plate 3c engaged with the side surfaces 1a ₃ and 2a ₃ ,
It consists of a front plate 3d facing the front surfaces 1a ₄ and 2a ₄ . 4 is a mounting hole provided on the top plate 3a of the shield cover 3; 5 is a tap hole provided on the top surface 1a1 of the shield case 1a of the recording/playback magnetic head ₁ ;
6 is a mounting screw, 7 is a core of the recording/reproducing magnetic head 1, and 8 is a core of the erasing magnetic head 2. Next, to attach the shield cover 3 to the magnetic head assembly A, attach the shield cover 3 to the magnetic head assembly A.
After that, the shield cover 3 is fixed to the magnetic head assembly A by passing screws 6 through the mounting holes 4 provided in the top plate 3a of the shield cover 3 and screwing them into the tapped holes 5 provided in the shield case 1a. Ta.

By the way, the above conventional example had the following drawbacks.

(1) The shield cover 3 must have a mounting hole 4, the shield case 1a must have a tap hole 5,
Further, after the shield cover 3 is screwed to the shield case 1a with the screws 6, lock paint must be applied to prevent the screws 6 from loosening.

(2) Since the mounting hole 4 must be provided in the shield cover 3, the press mold becomes complicated.

(3) The shield case 1a requires tap holes 5 for the screws 6 for attaching the shield cover 3, which increases the processing cost of the shield case 1a.

(4) Screws 6 for installation are required, increasing the number of parts.

[Purpose of invention]

The present invention aims to eliminate the above-mentioned conventional drawbacks, and the purpose of the present invention is to provide a shield cover mounting structure for a magnetic head that is easy to work with and requires a small number of parts. .

[Summary of the idea]

In order to achieve the above object, the present invention provides an inward convex portion on at least one of the side plates of the shield cover that clamps the side surfaces of the shield case of the magnetic head, so that the side plate of the shield cover is magnetically It is characterized by being tightly fitted to the side surface of the shield case of the head, thereby improving workability and reducing the number of parts.

[Example of idea]

Figures 1a, b, and c show an embodiment of the present invention,
Figure a is a plan view of the magnetic head with a shield cover attached, figure b is a front view, and figure c is a side view.

Note that the same parts as those in the conventional example shown in FIG. 3 are given the same reference numerals and detailed explanations will be omitted.

The difference between the above-mentioned embodiment and the conventional example is that in the present invention, the dimensions between the pair of side plates 3c of the shield cover 3 are changed between the shield case 1a of the magnetic heads 1 and 2,
The side plate is slightly smaller than the dimension between the side surfaces 1a ₃ and 2a ₃ of the shield cover 3 and is fitted with the side surface 1a ₃ of the shield case 1a of the magnetic head 1 of the shield cover 3. This is the point where the number 9 was set.

When the shield cover 3 as described above is attached to the magnetic head assembly A with a strong fit, the protrusions 9 of one side plate 3c and the other side plate 3c of the shield cover 3 2a ₃ and the side surface 1a ₃ of the shield case 1a, the shield cover 3 and the magnetic head assembly A are fixed. Furthermore, if the fixing strength between the shield cover 3 and the magnetic head assembly A is required, for example, by injecting adhesive from an adhesive inflow hole (not shown) provided in the top plate 3a of the shield cover 3. Secure fixation is achieved.

Figures 2a, b, and c show other embodiments of the present invention, in which figure a is a plan view of a magnetic head with a shield cover attached, figure b is a front view, and figure c is a side view.

Note that the same parts as those in the conventional example shown in FIG. 3 are given the same reference numerals and detailed explanations will be omitted.

The difference between the above embodiment and the conventional example is that in the present invention, the dimension between the pair of side plates 3c of the shield cover 3 is changed to the size between the shield case 1a of the magnetic heads 1 and 2,
The side plate 3c of the shield cover ₃ is slightly smaller than the dimension between the side surfaces 1a 3 and 2a ₃ of the shield case 2a, and the side plate 3c of the shield cover 3 is long, so that the side plate 3c fits with the side surface 1a ₃ of the shield case 1a. This is because two convex portions 9 are provided inwardly in the longitudinal direction of the side plate 3c on the side surface.

In this embodiment as well, when the shield cover 3 is attached to the magnetic head assembly A with a strong fit, the two protrusions 9 on one side plate 3c and the other side plate 3c of the shield cover 3 , shield case 2a ₁
Since the sides _2a3 and _{1a3 of 1a1 and 1a1 are} clamped, the shield cover 3 and the magnetic head assembly A are fixed. As in the first embodiment, if additional strength is required to secure the shield cover 3 and the magnetic head assembly, for example, the top plate 3 of the shield cover 3 may be
Reliable fixing is achieved by flowing the adhesive through an adhesive inflow hole (not shown) provided in a.

According to the embodiment of the present invention, the following effects are achieved.

(1) The tap hole 5 required in the conventional shield case _1a1 is not required.

(2) Mounting hole 4 previously required for shield cover 3
Since there is no need for this, the press mold becomes simple.

(3) There is no need to screw the shield cover 3 together.

By combining the above (1), (2), and (3), workability is improved compared to the conventional method.

(4) The screws 6 for attaching the shield cover 3 are no longer required, resulting in a reduction in the number of parts.

In both of the above-mentioned embodiments, a magnetic head assembly A is constituted by a recording/reproducing magnetic head 1 and an erasing magnetic head 2, and a shield cover 3 is provided to cover this magnetic head assembly A. However, the present invention is not limited to this, and the above-described shield cover mounting structure may be provided to the recording/reproducing magnetic head 1 or the erasing magnetic head 2 provided separately. Good too. Further, in both embodiments, a convex portion is provided on one side plate 3c of the shield cover 3, but it may be provided on both side plates 3c.

[Effect of idea]

According to the present invention, at least one of the side plates of the shield cover that clamps the side surface of the shield case is provided with a convex portion, and the shield cover is tightly fitted to the side surface of the shield case of the magnetic head. Workability is improved compared to a stop structure, and since screws are not required, the number of parts can be reduced.

[Brief explanation of the drawing]

Figure 1 shows an embodiment of the present invention, in which figure a is a plan view of a magnetic head with a shield cover attached, figure b is a front view, figure c is a side view, and figure 2 is another embodiment of the present invention. Embodiments are shown in which Figure a is a plan view of a magnetic head with a shield cover attached, Figure b is a front view, Figure c is a side view, and Figure 3 is a shield cover mounting structure of a conventional audio magnetic head for VTR. FIG. DESCRIPTION OF SYMBOLS 1, 2...Magnetic head, 1a, 2a...Shield case, _1a3 , _2a3 ...Side surface of shield case, A...Magnetic head assembly, 3...Shield cover, 3a...Top plate, 3b... ...Back plate, 3c...
...Side plate, 3d...Front plate, 9...Protrusion.

Claims (1)

[Scope of utility model registration request] A shield for a magnetic head, characterized in that a convex portion is provided on at least one side plate of a shield cover that clamps the side surface of a shield case of the magnetic head, and the shield cover is tightly fitted to the side surface of the shield case of the magnetic head. Cover mounting structure.