JP2747140B2 - Magnetic head holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head holder incorporated in a magnetic head for audio, and more particularly to a versatility.

[0002]

2. Description of the Related Art FIGS. 2 and 9 show an example of a magnetic head used for audio such as a cassette tape recorder. In FIGS. 2 and 9, reference numeral 1 denotes a magnetic head. This magnetic head 1
A box-shaped shield case 2 made of permalloy or the like
Inside the magnetic cores 3, 3, for recording, reproducing, erasing, etc.
3, and a magnetic head holder 14 having shield plates 4, 4, 4 for shielding the magnetic cores 3, 3, 3, 3 from each other. The sliding surface 12 on the front surface of the magnetic head 1 has a shape slightly bulging in the direction in which the magnetic tape 5 slides. Further, the front ends of the magnetic cores 3, 3, 3, 3 and the shield plates 4, 4, 4 are exposed to the sliding surface 12, and the bobbin around which the coil is wound is provided at the rear of the magnetic cores 3, 3, 3, 3. 16, 16, 16, 16 are provided, and each bobbin 1
6, 16, 16, 16 are provided with terminal pins 18, 18, 18, 18 connected to an electric circuit. Further, the space inside the shield case 2 is filled with a resin material. Further, as shown in FIG. 2, this magnetic head 1
It is fixed to the mounting base 6. The mounting base 6 includes tape guides 7 and 8, a frame 9 provided below the tape guides 7 and 8, and mounting portions 10 and 1 provided on both left and right side surfaces of the frame 9.
Consists of one. The tape guides 7 and 8 have tape sliding portions 7 a and 8 a for guiding the running of the magnetic tape 5.
Are formed.

[0003]

By the way, depending on the use of the magnetic head, for example, for a car stereo or a mini cassette recorder, or when a new model is designed, various types of magnetic heads are used. Heads are required and are being produced. A magnetic head holder corresponding to each of these types of magnetic heads is also required. In general, the mainstream type is a magnetic head holder 14 of the type shown in FIG.
The magnetic head holder 15 of the type shown in FIG. 10 having a height of about 6 mm has been produced. The magnetic head 1a of FIG.
9, the magnetic core 3, the shield plate 4, the bobbin 17,
Terminal pins 19 are mounted, and the magnetic head holder 15 is installed in the shield case 2a.

In the manufacturing process of the magnetic head 1, the magnetic core 3 and the shield plate 4 are assembled into the magnetic head holder, the magnetic head holder is assembled into the shield case 2, and the like. Until this point, the two different types of magnetic head holders 14 and 15 require different parts, production equipment, jigs and tools, and different production lines. Therefore, the production efficiency is poor, and this has caused a rise in product cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a magnetic head holder capable of reducing the production line and reducing the product cost even in the production of various types of magnetic head holders. To provide.

[0006]

A magnetic head holder according to the present invention is provided with a magnetic core having a front end exposed on a sliding surface of the magnetic head and installed in a shield case to form a magnetic head. In the head holder, a cutting groove is formed behind the magnetic core of the magnetic head holder along a direction parallel to the sliding contact surface.

[0007]

According to the magnetic head holder of the present invention, when a magnetic head holder of a different type is required, a cutting groove is formed in one of the magnetic head holders, and if necessary, the cutting groove does not require the magnetic head holder. The other magnetic head holder can be manufactured only by cutting and removing the portion. Therefore, different magnetic head holders can be manufactured in almost the same manufacturing process.

[0008]

Embodiment 1 An embodiment of a magnetic head holder according to the present invention will be described below with reference to FIG. FIG. 1 shows a magnetic head holder 20.
The magnetic cores 3 and 3 and the shield plate 4 are provided only in the left half of the figure.
Is shown. The magnetic head holder 20 of the present embodiment has a schematic shape similar to that of the magnetic head holder 14 of the type shown in FIG. 9, but is characterized in that the magnetic head holder 20 is formed with a cutting groove 22. Is what you do. Substantially L-shaped magnetic head holder 20
, A predetermined magnetic core 3, a shield plate 4, and a bobbin around which a coil is wound are mounted. A pair of magnetic head holders 20 are installed in a shield case so as to face each other so as to include the mounted magnetic cores 3,... And the shield plates 4,. The magnetic head 1 shown in FIGS. FIG. 3 is a view of the magnetic head viewed from the sliding contact surface side, and the right half thereof is viewed through the upper surface of the shield case 2. FIG. 4 is a side view of the magnetic head 1, and FIG.
-B sectional view (right half) and CC sectional view of FIG. 3 (left half)
Are combined. Further, FIG.
It is -A side sectional drawing. The cutting groove 22 is formed rearward (below in FIG. 1) of the magnetic cores 3 to be mounted, and is formed at a predetermined position corresponding to a desired magnetic head. The cutting groove 22 is formed along the direction parallel to the sliding surface of the magnetic head (in the horizontal direction in FIG. 1). The width and depth of the cutting groove 22 have no influence on the normal process or use, but if a post-process includes a bending-cutting process, it is designed so that it can be easily bent at that process. Therefore, it depends on the material of the magnetic head holder 20. For example, when the magnetic head holder 20 is made of zinc die-cast and has a plate thickness of 1 to 1.5 mm, the width of the cutting groove 22 is about 0.1 to 0.5 mm and the depth is 0.5. About 1 mm is preferable. still,
Reference numerals 24, 24,... Are core mounting grooves for mounting the magnetic core 3, and reference numerals 26, 26, 26, 26 are bobbin positioning grooves for mounting bobbins.

Next, a process for manufacturing a magnetic head using the magnetic head holder 20 will be described. First, this cutting groove 2
The magnetic core 3,
And shield plates 4, 4,. And
After polishing the mating surfaces of the pair of magnetic head holders 20,
A bobbin around which a coil is wound is mounted, a magnetic head holder is combined so as to include the magnetic core 3 and the shield plate 4, and the magnetic head holder is further installed in the shield case 2. Further, the inside of the shield case 2 is filled with resin from the rear, and the magnetic head holder is fixed. At this time, the coil wound around the base of the terminal pin 18 is also covered with the resin. In the next sliding contact surface polishing step, the sliding contact surface is polished and the depth of the magnetic gap is adjusted. Next, when the desired magnetic head holder is the one shown in FIG. 9 (9 mm type), since the length of the magnetic head holder is already adapted, a tape guide or the like is directly attached to the side surface of the shield case by welding or the like. Attach. If the desired magnetic head holder is of the type shown in FIG.
After removing the holder end 28 behind, the process proceeds to the next step (tape guide mounting). The removal of the holder end portion 28 can be easily performed by bending and cutting at the formed cutting groove 22 (bending cutting step). Thus, FIGS.
And FIGS. 4 and 5 (9 mm type) or FIG. 10 (6 mm type)
A magnetic head as shown in (type) is manufactured, and finally manufactured through measurement and inspection.

If the magnetic head holder of this embodiment is used, two types of magnetic head holders can be manufactured only by adding a step of bending and cutting a cutting groove as needed during the manufacturing process. Therefore, most parts, production equipment, and jigs and tools can be used, and the manufacturing cost can be reduced. In addition, the production line can also be used, enabling mixed production of multiple types of magnetic head holders, absorbing fluctuations in the production volume of multiple types, improving equipment utilization, and significantly reducing product costs. It is assumed that.

In this embodiment, a 9 mm type and a 6 m type are used.
Although it can be applied to two types for m type, it is needless to say that the present invention is not limited to this length, and a cut groove can be formed at an appropriate position based on required specifications. Furthermore, the number of cut grooves is not limited to one, and by increasing the number as needed, more types of magnetic head holders can be produced without increasing the manufacturing cost.

[Embodiment 2] A cutting groove is formed on an inner surface of a magnetic head holder 20 as shown in FIG.
The cutting groove 23 may be formed on the outer surface of the magnetic head holder 21 like the magnetic head holder 21 described above. In addition to the cut groove having a rectangular cross section as shown in FIG. 4, the cut groove 23 may have a triangular cross section as shown in FIG. Even with this magnetic head holder 21,
As in the case of the first embodiment, the magnetic head is manufactured through steps such as installing it in the shield case 2 and filling the periphery thereof with a resin. At this time, if the desired magnetic head is of a 9 mm type, the shield case 2 covers the cutting groove 23 as shown in FIG. When the desired magnetic head is of a 6 mm type, when the magnetic head holder 21 is installed in the shield case 2, the cut groove 23 is located at the lower end of the shield case 2 as shown in FIG. 7. In this state, when the holder end portion 29 is bent outward (in the direction of the arrow) by the cutting groove 23, the magnetic head holder 2 is bent.
8, the holder end portion 29 is cut out, and the magnetic head holder 21 becomes a magnetic head holder 21a suitable for a 6 mm type magnetic head 30a (shield case 2a) as shown in FIG. In the magnetic head holder 21 according to the second embodiment, since the cutting groove 23 is formed in a triangular cross section on the outer surface of the magnetic head holder 21, the holder end 2 is formed.
9 is easier to bend outward. In the manufacturing process,
The bending and cutting step of the cutting groove 23 is performed after the magnetic head holder 21 is assembled in the shield case 2 and filled with resin. In this case, if the holder end 29 is bent inward,
The terminal pin 18 may be damaged, and the holder end 29
Is preferably bent outward. Therefore,
In the case of the magnetic head holder 21 according to the second embodiment, different types of magnetic head holders are manufactured by easily bending and cutting the holder end 29 outward in the cutting groove 23 without damaging the terminal pins 18. be able to.

As described above, the shape of the cutting groove has no influence on the ordinary process or use, but if the post-process includes a bent cutting process, the shape of the cut groove is easily bent during the process. The shape is not limited to the above-described rectangular and triangular shapes as long as it is possible, and various shapes can be adopted.

[0014]

According to the magnetic head holder of the present invention,
Even when multiple types of magnetic head holders of different sizes are required, a cutting groove is formed in one of the larger types of magnetic head holders, and unnecessary portions are cut with the cutting grooves as necessary. Since the other magnetic head holder is manufactured by removing the magnetic head holder, the versatility of the magnetic head holder can be increased, and most parts, production equipment, and jigs and tools can be used. Therefore, the manufacturing cost can be reduced. In addition, the production line can also be used, enabling mixed production of multiple types of magnetic head holders, absorbing fluctuations in the production volume of multiple types, improving equipment utilization, and significantly reducing product costs. It is assumed that.

[Brief description of the drawings]

FIG. 1 is a side view of a magnetic head holder according to the present embodiment.

FIG. 2 is a perspective view of a magnetic head.

FIG. 3 is a front view of the magnetic head according to the first embodiment.

FIG. 4 is a combination of the sectional view taken along the line BB and the sectional view taken along the line CC of FIG. 3;

FIG. 5 is a sectional view taken on line AA of FIG. 3;

FIG. 6 is a side sectional view of a magnetic head according to a second embodiment.

FIG. 7 is a side sectional view showing a magnetic head before bending and cutting a 6 mm type magnetic head in Example 2.

FIG. 8 is a side sectional view of a 6 mm type magnetic head.

FIG. 9 is a side sectional view of a conventional magnetic head, and FIG.
It is AA sectional drawing of.

FIG. 10 is a side sectional view of another type of magnetic head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic head 1a Magnetic head 2 Shield case 2a Shield case 3 Magnetic core 4 Shield plate 5 Magnetic tape 12 Sliding surface 14 Magnetic head holder 15 Magnetic head holder 20 Magnetic head holder 21 Magnetic head holder 21a Magnetic head holder 22 Cutting groove 23 Cutting Groove 30 Magnetic head 30a Magnetic head

Claims (1)

(57) [Claims] 1. A magnetic head holder comprising a magnetic core having a front end exposed to a sliding contact surface of the magnetic head and being installed in a shield case to constitute a magnetic head. A magnetic head holder, wherein a cutting groove is formed at a rear side along a direction parallel to the sliding contact surface.