JPH02177118A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain the same workability as that of a single head and to facilitate the assembly adjustment of the head by positioning the head chip fixing surface of one head base on the same surface as the head chip fixing surface of the other head base. CONSTITUTION:The magnetic head is formed so that a pair of head chips 1a, 1b for constituting a double azimuth head are fixed separately, respectively, and thereafter, the head chip fixing surface 3a1 of one head base 2a of two pieces of head bases 2a, 2b which are superposed and joined to each other is positioned on the same surface as the head chip fixing surface 3b1 of the other head base 1b. In such a way, to both the head chips 1a, 1b, winding is executed in a state of separate bodies and the assembly workability of the double azimuth head is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic head attached to a rotating drum and used as a recording/reproducing head of a magnetic recording/reproducing device, for example, a VTR (video tape recorder).

(Summary of the Invention) A magnetic head according to the present invention includes a pair of head chips constituting a double azimuth head, each fixed to a separate head base, and joined by overlapping the bases with their inner surfaces facing each other. The head tip fixing surfaces of both head bases are formed on almost the same plane, and the head and throat tips are fixed to both of these mounting surfaces, and are arranged to face each other laterally at a predetermined interval. The winding work for the head can be done in the same way as for a single head, making it possible to automate head assembly, and also eliminate the waste of discarding the other good head chip if one of a pair of head chips is defective. Furthermore, by arranging both head chips on substantially the same plane, the same reference plane as that of a conventional double azimuth head can be obtained.

[Prior Art] Generally, in a VTR, a magnetic head H is attached to a rotating drum D, as shown in FIG. 5, and signals are recorded on a magnetic tape wound around the drum D by the magnetic head H. Or, signals recorded on magnetic tape are read out. The head chip (21) constituting the magnetic head is attached to the head base (22) shown in FIGS. 6 to 8.
It is designed to be attached to the protruding piece (23) at the tip of the head base (22). The head base (22) supporting the head chip (21) is attached to the screw (24).
) to be attached and fixed to the rotating drum D.

Furthermore, in a VTR that performs variable speed playback, as shown in FIGS. 6 to 8, the protrusion (23
) are attached to two head chips (21), and these helad chips (21) constitute a double azimuth head. Incidentally, such a head is similar to the magnetic head known from Japanese Utility Model Application No. 60-70916.

[Problem to be solved by the invention]

When assembling such a conventional tuple azimuth head, two Herad chips (2
1) and two Herad chips (21)
Each of the two Herad chips is wound with a wire, and then the output characteristics of the two Herad chips are measured and inspected.

Therefore, winding must be performed on two Herad chips (21) that are very close to each other, which makes the winding work difficult or time-consuming, and it is difficult to automate the winding work. Furthermore, if one of the Herad chips (21) is found to be defective as a result of the inspection, both Herad chips must be discarded, resulting in a problem of waste.

Furthermore, in a double azimuth head, the difference between the dimensions a and b between the top surface of the head base (22) of the two helad tips (21) and the edge of the gap g shown in FIG. It is necessary to keep the dimensions within a certain range with precision. However, since the values of a and b mentioned above vary by more than 10 μm when manufacturing the Herad chip (21), the head chips (21) are ranked based on the dimensions of a and b and paired as a base. (22), but classifying head chips into ranks in this way requires a complicated selection process.
This method has drawbacks such as requiring a lot of time and effort to assemble the head, resulting in high costs.

The present invention has been made in view of these problems, and allows the winding and height adjustment of the double azimuth head to be easily performed at the assembly stage, eliminates the waste of discarding good Herad chips, and makes it easier to assemble. It is an object of the present invention to provide a magnetic head which is simple and which can provide the same reference plane as that of a conventional double azimuth head having an integral head base.

[Means to solve the problem]

In order to achieve the above object, the magnetic head of the present invention has a pair of head chips constituting a double azimuth head fixed to separate head bases, and both head bases are overlapped and bonded to each other. The Herad chip fixing surface of one of the head bases is formed on the same surface as the Herad chip fixing surface of the other head base, and both head chips are attached to the head base with a predetermined gap on the same side. They are configured to be fixed to each other in the lateral direction.

[Effect]

Therefore, according to the present invention, by winding a pair of helad chips constituting an azimuth head while being fixed to separate head bases, it is possible to obtain workability similar to that of a single head, and to assemble and adjust the head. In addition, even if one of the Herad chips in a double azimuth head is defective, the other good Herad chip can be combined with other good head chips to form a double azimuth head, eliminating waste. It is advantageous in terms of cost, and since both head chips are arranged on almost the same plane, the same reference plane as a conventional double azimuth head can be obtained, so there is no problem in installing it on a rotating drum, etc. I can do it.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4.

First, a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

In the figure, (la) and (lb) are a pair of Herad chips constituting a double azimuth head, and as shown in Fig. 3, they are respectively attached to separate head bases (2a) and (1).
This head base (2a) is fixed to the tip of the head base (2b).
A double azimuth head is constructed by overlapping and fixing the head chips (la) and (2b) vertically so that the head chips (la) and (lb) are adjacent to each other with a predetermined gap.

Of these head bases (2a) and (2b), the main surface portion of one of the head bases (2a) <2a1) is formed to be approximately half the size of the main surface portion (2b+) of the other head base (2b). The main surface part (2a + ) and (2
b t ) has fixing pieces (3a) and (3h) to which the head chips (1a) and (lb) are fixed protruding symmetrically when viewed from the top and bottom sides, and these fixing pieces (3a) and (3b)
have different thicknesses.

That is, when both head bases (2a) and (2b) are placed one on top of the other with their inner surfaces facing each other, the fixing piece (3a) of one head base (2a) has its inner surface facing the other head base (2b). It is formed thick so that it is located on the same plane as the outer surface side of the fixed piece part (3b), and this fixed piece part (3a
) and the outer surface of the tip of the fixing piece (3b) are connected to the fixing surfaces (3a, ) of the head tips (la) and (lb) and (
3b+). The fixed pieces (3a) and (
Cut grooves (4a) and (4b) corresponding to the inner edge side of 3b)
is formed, and the main surface portions (2a,) and (2b + )
Attachment holes (5a) and (5b) are bored in the.

Then, the fixed portions (3a) and (3b) of both head bases (2a) and (2b) have fixed surfaces (3a
+) and (3b+), respectively, with azimuth gap Herad chips (la) and (lb) glued together with adhesive,
In this state, by overlapping the head bases (2a) and (2b) with their inner surfaces facing each other so that the mounting holes (5a) and (5b) communicate with each other, the fixed pieces (3a) and (3b) can be separated. The inner fixing surface (3a+) of the fixing piece part (3a) and the outer fixing surface (3b) of the fixing piece part (3b) are arranged symmetrically adjacent to each other at a predetermined interval when viewed from the top and bottom sides, and when viewed from the front side, the inner fixing surface (3a+) of the fixing piece part (3a)
The head chip (1
A) and (lb) are horizontally adjacent to each other with a predetermined gap when viewed from the front side. Moreover, by overlapping the head bases (2a) and (2b) in this way, the main surface portion (2a + ) of the head base (2a) is formed on the upper surface side, that is, the surface on the side of the small head base (2a). Since the outer surface of the head base (2b) and a portion of the inner surface of the main surface (2bl) of the other head base (2b) are exposed, the terminal plates (68) and (6b) are fixed to the respective exposed surfaces.

Therefore, to assemble a double azimuth head, attach the head tip (la) to both head bases (2a) and (2b).
.

(1b) is fixed by adhesive or the like as described above, the head chips (la) and (lb) are wound with prescribed coils (7a) and (7b). ) terminal (7a+) (7az
), (7b+), (7bz) to the terminal board (6a),
(6b) and each helad tip (la)
, formed into a single head shape on the (lb) side. With the single head formed in this manner, head characteristics are checked.

After this check, a good single head, that is, a head base (2a), (2b) to which good head chips (la), (lb) are fixed, is removed from its main surface (2a+
), (2b+) are polymerized and fixed by adhesion with adhesive or welding with the inner surfaces facing each other, the head chip (la) is formed.
As described above, a double azimuth head is obtained in which (1b) and (1b) are arranged horizontally opposite each other with a predetermined gap.

Note that the head bases (2a) and (2b) are made of a conductive material so that they can be grounded.

Examples of this conductive material include copper, brass, bronze, conductive plastic, and iron-based alloys (Si, Al1, Ni, C
.

(containing), aluminum, ceramic (having conductivity on the surface or particles), etc. can be used.

Furthermore, the terminal plates (6a) and (6b) can be made of resin base materials such as epoxy, polyimide, paper phenol, etc., which are used in ordinary wiring boards.

In the double azimuth head of this embodiment configured in this way, the windings of the coils (7a) and (7b) to the pair of helad chips (la) and (lb) are connected to the head chip (l).
a), (lb) respectively on separate head bases (2
a) and (2b) are fixed, so
There is no need to wind the wire with a pair of Herad tips close to each other with a minute gap as in the past, and therefore the winding work can be done in the same way as with a single head, improving work efficiency, especially when the head base (2a), ( Head tip (la) to 2b).

The installation of (1b) can be automated, and the winding work can also be automated.

Also, after winding, each head chip (Ia), (lb)
By being able to confirm the head characteristics of one Herad tip (LA) that makes up the double azimuth head.
Even if head chip (1b) or (lb) is defective, it is possible to eliminate the waste of discarding the other head chip (1b) or (la).

In addition, in this way, good quality helad chips (la) and (
When the head bases (2a) and (2b) to which the head bases (1b) and (2b) are fixed are superimposed and fixed, the Herad tip (la) and (
1b) is located on the same surface as the outer surface of the other head base (2b), and the terminal plates (6a) and (6b) are arranged exposed on the one head base (2a) side. As shown in FIG. 4, the outer surface of the other head base (2b) is brought into contact with the mounting reference surface of the rotating drum D, and the mounting holes (5a), (5
Through b) the clamping can be fixed.

In this example, both head chips (Ia) are used.

(lb) must be shifted up and down, the thickness of the fixing piece (3a) of one head base (2a) should be made thicker or thinner, that is, the fixing surface of the fixing piece (3a) (
3a+) and the other head base (2b) fixing piece (3
By providing a required level difference between the head chips (3b+) and the fixed surface (3b+) of b), a difference in height is created between both head chips (Ia) and (lb).

Although one embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and can be modified in various ways without departing from the spirit of the present invention.For example, one of the small head bases (2a) is made even smaller, that is, the mounting hole (5
A) is not drilled, but the mounting hole (5b) of the other head base (2b) is formed in a shape that escapes, and when installing to the rotating drum, the screw (10) is inserted into the other head base (2b).
Insert only into the mounting hole (5b) of the other head base (
By tightening only the small head base (2b) so that no stress is applied to one of the small head bases (2a), peeling of the small head base (2) can be prevented.

In addition, the main surface portion (2a+) of one head base (2a)
is the same size as the main surface (2b) of the other head base (2b).

The fixing piece (3b) of the other head base (2b) may be formed in the same shape, and the inner surface of the fixing piece (3b) of the other head base (2b) may be flush with the outer surface of the fixing piece (3a) of the one head base (2a). By overlapping and joining both head bases (2a) and (2b), a double azimuth magnetic head that is similar in appearance to a conventional integrated head base magnetic head can be obtained. It will be done.

〔Effect of the invention〕

As described above, according to the present invention, after a pair of Herad chips constituting a double azimuth head are fixed separately, the Herad chip is fixed to one of the two head bases that are overlapped and joined together. By forming the surface so that it is located on the same plane as the Herad chip fixing surface of the other head base, winding can be done separately on both head chips, improving the workability of assembling the double azimuth head. At the same time, both head chips are fixed on the same side, so it has the same configuration as a conventional double azimuth head with an integrated head base, and can be installed on a rotating drum etc. in the same way as a conventional head. Wiring can also be done easily.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of a magnetic head according to the present invention;
Fig. 2 is a front view of the same, Fig. 3 is an exploded perspective view of the same, Fig. 4 is a side view of the same when attached to a rotating drum, and Fig. 5 is of a rotating head drum equipped with a conventional magnetic head. 6 is a front view of a conventional magnetic rad, FIG. 7 is a side view, FIG. 8 is a plan view, and FIG. 9 is an enlarged front view. In the figure, (la) and (lb) are head chips, (2a)
, (2b) is the head base, (2a+), (2b
+) is the main surface part, (3a) and (3b) are the fixed piece parts, (
3a+) and (3bl) are fixed surfaces. Agent Sadado Ito Hidemori Matsukuma at - Teru 1 #! + Inkstone drawing III Figure 3a r 3ks --- solid ss + r Sa13kl --- Fixed surface front view Figure 2 Front view of Udo Figure 8

Claims (1)

[Claims] A pair of head chips constituting a double azimuth head are respectively fixed to separate head bases, and the two head bases are overlapped and joined to each other, and one head of the two head bases is bonded to the head base. The head chip fixing surface of the base is formed to be located on the same plane as the head chip fixing surface of the other head base, and both of the head chips are laterally opposed to the head base with a predetermined gap on the same side. A magnetic head that is fixed in place.