JP2547016Y2 - Magnetic head - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to a magnetic head incorporated in a cassette type tape recorder for a vehicle and the like.

[Prior Art] For example, as shown in FIG. 3, a conventional magnetic head incorporated in a cassette type tape recorder or the like includes a pair of recording / reproducing / erasing etc. in a rectangular box-shaped shield case 2. Each of the magnetic cores 3 is mounted, and plate-like tape guides 5 for guiding the running of the magnetic tape 4 are attached to both left and right sides of the shield case 2, respectively.

A gap (G) is formed between each pair of magnetic cores 3 of the tape sliding portion 6 of each magnetic core 3, and a shield plate 7 is provided between adjacent magnetic cores 3. ing. Further, magnetic powder generated by sliding of the magnetic tape is stored in a portion sandwiching the gap (G) on the front surface of the shield case 2 so that the magnetic powder is not exposed to the tape sliding portion 6. , Arc-shaped grooves 50, 50 are formed.

At the bottom of the magnetic head main body 1, a mounting plate 8 for mounting to a tape recorder or the like is mounted, and on the back of the magnetic head main body 1, signals for recording / reproduction of the magnetic head and the like are externally transmitted. A pair of terminals (T), (T) for guiding are provided.

[Problem to be Solved by the Invention] By the way, when the magnetic head having the above-described configuration is incorporated in a cassette type tape recorder for a vehicle, external noise generated from a vehicle-mounted electronic component that is complicatedly incorporated in a vehicle causes electromagnetic noise of the magnetic head. Deterioration of characteristics has been a disadvantage.

In view of this point, the present invention has an object to provide a magnetic head capable of preventing the influence of external noise.

[Means for Solving the Problems] Therefore, a magnetic head in which a shield cover for covering at least a portion of a magnetic head main body except a magnetic tape sliding portion and shielding external noise is attached to the magnetic head main body, The shield cover is composed of first and second shield covers joined to each other, the first shield cover covers at least four sides of the magnetic head, and the second shield cover covers at least the back surface of the magnetic head. A first notch is provided at an edge of the first shield cover joined to an edge of the second shield cover, and a second notch is attached to the edge of the first shield cover.
A second notch is provided at the edge of the shield cover, and the first notch and the second notch oppose each other.
Characterized in that an adhesive is injected into the notch.

[Operation] In the magnetic head of the invention, external noise to the magnetic head is shielded by the shield cover that covers the magnetic head body. Further, the shield cover is joined with the first and second shield covers and integrally joined, so that the assembly is easy.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Elements that are the same as the conventional constituent elements shown in FIG. 3 are given the same reference numerals, and detailed descriptions thereof are omitted.

As shown in FIG. 1, the shield cover 20 attached to the magnetic head main body 1 is formed of a magnetic material such as permalloy, and has a rectangular parallelepiped box shape having an opening on the tape sliding portion 6 side. 20A and rear shield cover 20B.

The front shield cover 20A includes a bottom plate 21 and the bottom plate 2
On both left and right edges of the bottom plate 21, a substantially U-shaped side plate 22, 22 formed at right angles to the bottom plate 21, and on both upper edges of these both plates 22, 22,
A top plate 23 is formed at right angles to the side plates 22 and 22 and opposed to the bottom plate 21 at a predetermined interval. At the edges of the side plates 22, 22 and the top plate 23 joined to the rear shield cover 20B, cutout portions 22 for injecting adhesive are respectively provided.
a, 22a and 23a are formed.

The rear shield cover 20B includes a back plate 24 in contact with the back surface of the magnetic head main body 1, a back plate 24 on both left and right edges of the back plate 24, two side plates 25, 25 formed at right angles, and both side plates. A top plate 26 formed at right angles to the side plates 25, 25 at both upper edges of the tops 25, 25. The back plate 24 has a pair of holes 24b through which the terminals (T) of the magnetic head main body 1 are inserted.

The front shield covers 2 of the side plates 25, 25 and the top plate 26
Notches 25b, 25b, and 26b for injecting an adhesive, similar to front shield cover 20A, are also formed at the edge joined to 0A.

The shield cover 20 having the above configuration is attached to the magnetic head main body 1 as follows.

As shown in FIG. 2, a mounting plate 8 is first mounted on the bottom of the magnetic head main body 1. Next, the front shield cover 20A is covered from the front side of the magnetic head body 1, and the rear shield cover 20B is covered from the back side of the magnetic head body 1.

The dimensions of the shield cover 20 are made slightly smaller than the outer diameter of the magnetic head main body 1 so that the shield cover 20 is fitted by fitting when the magnetic head main body 1 is mounted. At this time, the terminals (T), (T) of the magnetic head main body 1 are inserted into the pair of holes 24b, 24b formed on the back surface of the shield cover 20.

In this manner, the front shield cover 20A and the rear shield cover 20B are fitted to the magnetic head main body 1 with the magnetic head main body 1 therebetween.

Further, an adhesive is injected into the notch of the shield cover 20 to be solidified, and the front shield cover 20A, the rear shield cover 20B and the magnetic head main body 1 are fixed.

Since the front end portions of the bottom plate 21 and the top plate 23 of the front shield cover 20A protrude forward from the front surface of the shield case 2, that is, forward from the magnetic tape sliding portion 6, external noise enters the magnetic tape sliding portion 6. The bottom plate 21 and the top plate
23 can be shielded. Therefore, in the case where the external noise acts on the magnetic head from all directions, such as an in-vehicle cassette tape recorder, the top plate 23 and the bottom plate 21 which protrude forward from the magnetic tape sliding portion 6 are provided. This is particularly effective.

Further, the bottom plate 21 abuts against the side surface of the mounting plate 8 for easy positioning, and furthermore, the rear shield cover 20B
Is fitted along the edge of the front shield cover 20A where the notch is provided, so that assembly is easy.

The cutouts of the shield cover 20 described above need not necessarily be provided one by one on each of the top plates 23, 26 and the side plates 22, 25, but may be provided in large numbers. In the above-described embodiment, the case where the shield case 2 is integrally attached to the magnetic head has been described. However, the present invention can obtain the same effect even with the magnetic head without the shield case 2 attached.

[Effects of the Invention] As described above, according to the magnetic head of the present invention, since the magnetic head main body 1 is covered by the shield cover 20, a large number of external noises act, particularly in the case of an in-vehicle cassette tape recorder. It is possible to effectively shield noise from those that do. Further, since the shield cover 20 is integrally assembled by butt-joining the front shield cover 20A and the rear shield cover 20B, it is easy to form the shield cover 20.

Further, a first notch is provided at an edge of the first shield cover which is joined to an edge of the second shield cover, and the first notch is provided.
A second notch is provided at the edge of the second shield cover joined to the edge of the shield cover, and the first notch and the second notch are provided.
And the adhesive is injected into the first and second notches, so that the adhesive flows from the two notches to the joint between the edges of the shield covers. The fixing of the cover can be performed easily and reliably without impairing the shielding effect.

[Brief description of the drawings]

1 and 2 show an embodiment of the present invention. FIG. 1 is a perspective view of a magnetic head, FIG. 2 is an exploded perspective view of the magnetic head, and FIG. It is a perspective view. 1 Magnetic head body 6 Magnetic tape sliding section 20 Shield cover 20A Front shield cover 20B Rear shield cover

Claims (1)

(57) [Scope of request for utility model registration] 1. A magnetic head in which a shield cover that covers at least a portion of a magnetic head main body except a sliding portion of a magnetic tape is attached to the magnetic head main body, wherein the shield covers are butted and joined. And the first shield cover covers at least four sides of the magnetic head, and the second shield cover covers at least the back surface of the magnetic head. A first notch is provided at an edge of the first shield cover joined to the first shield cover, and a second notch is provided at an edge of the second shield cover joined to an edge of the first shield cover. A magnetic head characterized in that a first notch and a second notch face each other, and an adhesive is injected into the first and second notches.