JPH03122805A - Magnetic head device - Google Patents

Abstract

PURPOSE:To improve the intensity of a magnetic head device, to shield external oil introduced noise and to simplify work for fitting the magnetic head by embedding a magnetic substance in the frame body of a fitting stand and forming a positioning part to be abutted on the edge part of a magnetic tape sliding surface. CONSTITUTION:Between both side parts 7b and 8b, and between both side parts 7c and 8c of mutually facing tape guides 7 and 8 in a fitting stand 6 of a magnetic head 1, positioning parts 20 and 21 are formed to rise from the front surface of a frame body 9. The magnetic head 1 is positioned in the fitting stand 6 so that edge parts 4a and 4b of a magnetic tape sliding surface 4 can be abutted to tip parts 20a and 21a of the positioning parts 20 and 21 and positioned on the inside of the frame body 9. A plate-shaped magnetic substance 23 with rigidity is set to the internal part of a metal mold for molding in the fitting stand 6, and afterwards embedded in the internal part of the fitting stand 6 while pouring a resin material into the internal part of the metal mold. Thus, the intensity of the device can be improved and the externally introduced noise is shielded. Further, the work for fitting the head can be simplified.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic head device incorporated in a cassette tape recorder, etc., and more specifically, it is capable of shielding external noise and simplifies the installation work of the magnetic head. It's easy to understand.

[Prior Art] Conventionally, as an example of a magnetic head device incorporated in a cassette tape recorder or the like, a magnetic head device shown in FIG. 6 is known.

In this figure, the symbol l indicates a magnetic head. This magnetic head l has a magnetic core 3 for recording, reproducing, erasing, etc. loaded inside a shield case 2 in the shape of a rectangular parallelepiped made of permalloy or the like. The space is filled with a resin material, and an electric circuit is connected to the bottom of the space. Further, the tape sliding contact surface 4 on the upper surface of this magnetic head l has a magnetic recording medium (
It has a swollen shape in the direction in which the tape 5 slides.

This magnetic head l is fixed to a mounting base 6. This mounting base 6 is integrally molded from a synthetic resin material such as plastic, and is connected to the tape guide 7.8.
, a frame 9 provided at the bottom of the tape guide 78, and mounting portions 10 and 11 provided on both left and right sides of the frame 9.
It consists of

Further, the tape guide 7.8 is formed with tape sliding portions 7a, 8a for guiding the running of the magnetic tape 5. The mounting portion 10.11 has bolt holes 10a and Il for mounting the magnetic head 1 on a tape recorder or the like.
A is drilled.

When manufacturing the conventional magnetic head device as described above,
After positioning the magnetic head 1 on the mounting base 6 using a special external positioning means, the magnetic head l was attached to the mounting base 6 using a resin material or the like.

[Problem to be solved by the invention] However, in the above conventional magnetic head device,
Since the mounting base 6 is molded only from a synthetic resin material such as plastic, there is a problem that it is weak in strength and easily deforms.

Furthermore, for example, when a magnetic head device with the above configuration is incorporated into a tape recorder of a car stereo device installed in an automobile, noise (externally induced noise) generated from other electronic components installed in the automobile may have an adverse effect. There was a problem.

Furthermore, when attaching the magnetic head l to the mounting base 6,
Since the number of installation steps such as positioning steps increases, there is a problem in that work efficiency becomes extremely poor.

The present invention aims to solve the above problems.

[Means for Solving the Problems] A magnetic head device according to the present invention is a magnetic head device in which a magnetic head is attached to a mounting base having a frame in which a tape guide is formed so as to be located inside the frame. In this case, a magnetic material for shielding external noise is embedded in the frame of the mount, and a positioning part is formed in the frame of the mount that comes into contact with the edge of the magnetic tape ↑1 contact surface of the magnetic head. It is characterized by the fact that

[Function] According to the magnetic head device of the present invention, since a rigid plate-shaped magnetic material is embedded inside the mounting base, the structure is strong and can shield externally induced noise. It has become.

In addition, since positioning is performed by bringing the magnetic tape sliding surface of the magnetic head into contact with the positioning part provided on the frame of the mounting base, there is no need for special work to position the magnetic head, and the installation work of the magnetic head can be done easily. It is possible to simplify the process.

[Embodiment] FIGS. 1 to 3 show an embodiment of the magnetic head device of the present invention. In these figures, the same elements as those shown in FIG. 6 are denoted by the same reference numerals. The explanation will be omitted.

As shown in FIG. 1, in this magnetic head device, both sides 7b of the tape guides 7.8 of the mounting base 6 on which the magnetic head 1 is mounted face each other.

A positioning portion 20.21 is formed between 8b, 7c, and 8c, rising from the front surface of the frame body 9.

And the tip end 20a of this positioning part 20.21.

21a are formed by being bent in directions facing each other. As a result, as shown in FIG. 2, the edges 4 a and 4 bh of the magnetic tape sliding surface 1 of the magnetic head l
<Vi tip portions 20a, 21 of positioning portions-10, 21
A magnetic head l is positioned on the mounting base 6 so as to be in contact with the magnetic head a and located inside the frame body 9.

Then, a fixing resin material is filled between the mounting base 6 and the magnetic head main body 1, so that the magnetic head l is fixed to the mounting base 6.
Fixed.

Here, the mounting base 6 has a rigid plate-shaped magnetic material 23 made of permalloy or the like embedded therein, and its surface is covered with a resin material 22. The plate-shaped magnetic material 23 is formed by pressing a magnetic material as shown in FIG. and the first side plate 23b
The second side plate 23c and the third side 1ffi23d are embedded in the positioning part 20.21 of the mounting base 9, and the fixing plate 23e extends and is embedded in the frame 9 of the mounting base 6 and the mounting part IO. ing. In this way, the magnetic material 23 of the plate material
is set inside the mold of the mounting base 6, and then
It is designed to be buried inside the mounting base 6 by injecting a resin material into the inside of the mold.

When attaching the magnetic head 1 to the mounting base 6, insert the magnetic head 1 into the mounting position inside the frame 9 of the mounting base 6,
Edge of magnetic tape sliding contact 4 of magnetic head l < 4
a and 4b come into contact with the bottom surface of the upper end portion 20a21a of the positioning portion 20.21 of the mounting base 6, and then stop. As a result, the tape sliding surface 4 of the magnetic head body 1 inserted into the mounting base 6 is positioned. Thereafter, a fixing resin material is filled between the mounting base 6 and the magnetic head l, and the magnetic head l is fixed to the mounting base 6.

By the way, in the magnetic head device having the above configuration, a rigid plate-shaped magnetic material (original material 2) is provided inside the mounting base 6.
3 is buried, the structure is strong and can shield externally induced noise.

FIG. 4 shows another embodiment of the magnetic head device of the present invention. According to this magnetic head device, the positioning parts 25 and 26 of the mounting base 6 are made of a magnetic material such as permalloy with a stainless steel material on the inner surface, and the bent tip part It has a structure in which the resin material 27 is corrugated only on 25a and 26a. The magnetic head main body 1 is fixed by spot welding at contact points 28.29 between its side surface and the positioning portions 25.26.

Therefore, in the case of this embodiment as well, it is possible to obtain the same effects as those shown in Figs. Therefore, the drying time of the resin material is shortened, and the working efficiency of the magnetic head device is greatly improved.

FIG. 5 shows an example of the configuration of a magnetic head device in which the magnetic head 1 is spot welded at three locations.

[Effects of the Invention] As explained above, the magnetic head device according to the present invention has a rigid plate-shaped magnetic material embedded inside the mounting base, so it is strong and can shield externally induced noise. It is structured so that it can be

In addition, since positioning is performed by bringing the magnetic tape sliding surface of the magnetic head into contact with the positioning part provided on the frame of the mounting base, there is no need for special work to position the magnetic head, and the installation work of the magnetic head can be done easily. can be simplified.

[Brief explanation of drawings]

1 to 3 show an embodiment of the magnetic head device of the present invention, in which FIG. 1 is a perspective view of the magnetic head device, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1. , FIG. 3 is a perspective view of a plate-shaped magnetic material used in the present invention, FIG. 4 is a sectional view of a magnetic head device showing another embodiment of the present invention, and FIG. 5 is a perspective view of a magnetic head in three locations. FIG. 6 is a perspective view of the magnetic head device in the case of spot welding, and FIG. 6 is a perspective view of the conventional magnetic head device. 0.11...Mounting part, 0.21...Positioning part, Oa, 21a...Tip of positioning part, 2...
... Resin material, 3 ... Plate-shaped magnetic material, 5.26 ... Clad material, 7 ... Resin material 8.29.30 ... Spot welding location.

Claims (1)

[Claims] In a magnetic head device in which a magnetic head is attached to a mounting base having a frame on which a tape guide is formed so as to be located inside the frame, a magnetic material for shielding external noise is provided on the frame of the mounting base. A magnetic head device, characterized in that a positioning portion is embedded in the frame of the mounting base and comes into contact with an edge of a magnetic tape sliding surface of the magnetic head.