JPH0227722B2 - JIKIHETSUDO - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head comprising two head elements having different working gap lengths, and particularly to a magnetic head in which the working gap lengths are uniform over the entire gap.

When two head elements are provided to reproduce signals in significantly different frequency bands, such as an audio signal and a queue signal, the gap lengths of the two head elements are significantly different. In such a magnetic head, both head elements are individually constructed and then housed in a case. That is, as shown in FIG.
, a coil 3, and the like, and similarly, other head elements 4 are also configured in advance. The head elements 1, which have been individually constructed in this way,
4, along with the shield plate 5, etc., are housed in a case (not shown) in the arrangement shown in FIG.

Of course, by doing this, the head elements 1 and 4
configuring in advance, the process becomes complicated,
There are disadvantages such as an increase in the number of parts. and,
In order to eliminate such inconveniences, it is conceivable to use core holders 6 and 7 as shown in FIG. 2. That is, the core halves 2a, 4a (see FIG. 1) are attached to one core holder 6, the other core halves 2b, 4b (see FIG. 1) are attached to the other core holder 7, and then both core holders are attached. 6 and 7 are held together, and at this time head elements 1 and 4 are constructed.

However, if the operating gap length, that is, the thickness of the gap spacers 8, 9, differs significantly between the head elements 1, 4, the abutting distance between the core holders 6, 7, for example, as shown in FIG. It gets bigger towards the bottom. Therefore, there arises a problem that the gap lengths of the respective working gaps of the head elements 1 and 4 are not uniform.
For this reason, conventionally, the core holders 6 and 7 could not be used in such cases.

The present invention has been made in view of these points, and it is an object of the present invention to provide a magnetic head that uses a core holder to simplify the structure and also eliminates the disadvantage of non-uniform gap length.

Hereinafter, one embodiment of the magnetic head of the present invention will be described with reference to FIG. 3 and subsequent figures.

In FIG. 3, numerals 11 and 12 each indicate a core holder, and these core holders 11 and 12 are made of, for example, zinc die casting. Core halves 13, 14, 15, 1 are attached to these core holders 11, 12.
6, a shield plate 17, etc. are attached, and then the core holders 11 and 12 are held together using restraining springs 18 and 19 to form a magnetic head. Further, in this example, a groove 12a is formed in one core holder 12 extending from the front surface to the side surface.

That is, to construct the magnetic head of this example, the core half 1 is placed in the core holder 11 as shown in FIG.
Attach 3 and 14. Here, the core holder 11
Notches 11a, 11b, and 11c are formed on the front surface, and recesses 11d and 11e and a notch 11f are formed on the rear surface. Then, the operating gap sides of the core halves 13, 14 are engaged with the notches 11a, 11c, respectively, and the core halves 13, 14 are engaged with the notches 11a, 11c, respectively.
Recesses 11d and 11 are located on the rear gear side of the
It engages with e. Similarly, the other core half 1
5 and 16 are also attached to other core holders 12.

The core halves 13, 14, 15, and 16 are of a laminated type, and the position corresponding to the operating gap and the position corresponding to the rear gap are connected to the core holders 11, 12, respectively.
Polish together with the contact surface.

Thereafter, gap spacers 20 and 21 are placed at the working gap position. The gap spacer 21 is made thick, for example, to obtain a working gap length for cue signal reproduction, and the other gap spacer 20 is made thin, for example, to obtain a working gap length for audio signal reproduction. Note that instead of the gap spacers 20 and 21, a layer may be formed by vapor deposition or sputtering.

Then, as shown in FIG. 5, the core holders 11 and 12 are butted together. At this time, core holder 1
A shield plate 17 and the like are disposed inside 1 and 12. The shield plate 17 is connected to the cutout portions 11 of the core holders 11 and 12.
b, 11f, etc. Then, using the restraining springs 18 and 19, the core holder 11,
Fix 12. Of course, two holding springs 1
Instead of 8 and 19, an integrated restraining spring 20 as shown by the broken line may be used.

In this example, the groove 1 shown in FIG.
Form 2a. For example, instant cutting and melting can be performed using a laser beam, electron beam, infrared beam, etc. In this case, the length _l1 of the groove 12a is 1/3 to 2/3 of the depth _l2 of the core holder 12, and the width is, for example, 0.1 to 0.5 mm.

In such a configuration, since the groove 12a is formed, the front upper part 12U and the front lower part 12D of the core holder 12 can be bent independently in the direction of the arrow in FIG. In other words, the front upper part 12U is slightly bent in response to the thin spacer 20, and conversely, the front lower part 12D is considerably bent in response to the thick spacer 21.
In this way, the difference in thickness between the spacers 20 and 21 is absorbed by the difference in deflection between the upper front surface 12U and the lower front surface 12D of the core holder 12, and as a result, the core holders 11 and 12 do not come into diagonal contact with each other, and the operating gear length is reduced. It is uniform over the entire gap.

In addition, in this example, the groove 12a is formed with a laser beam or the like after the core holders 11 and 12 are pressed and held together by the springs 18 and 19, so the groove 12a is not formed in the previous process. Groove 12a
There is no inconvenience caused by For example, a groove 12a may be formed in advance, and the core half 1 may be inserted into the core holder 12.
5 and 16 are attached and polished together, the upper front surface 12U and lower front surface 12D of the core holder 12 move back and forth during polishing, making it impossible to form a uniform gap surface. The present invention does not have such disadvantages.

As described above, according to the magnetic head of the present invention, since the groove 12a is formed in the core holder 12, the upper front surface 12U and the lower front surface 12D of the core holder 12 are formed.
and bend independently. Therefore, the gap length becomes uniform over the entire gap. Of course, since the core holders 11 and 12 are used, the magnetic head can be constructed easily.

In addition, in this example, the grooves 12a are formed using a laser beam or the like after the core holders 11 and 12 are held down and held together by the springs 18 and 19, so there is no inconvenience in the previous processes, such as the gap surface polishing process. It never occurs.

It should be noted that the present invention is not limited to the above-described embodiments, and it goes without saying that various configurations may be adopted without departing from the scope of the invention.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a conventional magnetic head, FIG. 2 is a line diagram for explaining the present invention, FIG. 3 is a perspective view showing an embodiment of the magnetic head of the present invention, FIGS. FIG. 5 is a perspective view for explaining the example in FIG. 3. 11 and 12 are core holders, 12a is a groove, 1
3, 14, 15, 16 are core halves, 18, 1
9 and 20 are respective restraining springs.

Claims (1)

[Claims] 1 A gap spacer having a first thickness, which is arranged between a pair of core holder halves that house the first and second core halves and have one side as an abutting surface, and the pair of the first core halves. and a gap spacer having a second thickness different from the first thickness, which is disposed between the pair of second core halves, and the pair of core holder halves are held together. In the magnetic head, a kerf is formed in at least one of the core holders at a position between the first and second core halves and extends rearward with respect to the tape contacting surface when viewed from the working gap side. A magnetic head featuring: