JPH0755684Y2 - Composite magnetic head - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a composite magnetic head useful as an erasing / recording / reproducing head, and more specifically, a composite magnetic head capable of completely erasing recorded tracks even after azimuth adjustment. Regarding magnetic heads.

[Prior Art] As a composite magnetic head of this type, a conventional magnetic head, for example, SAIKAI 55-
Some are described in Japanese Patent No. 141330.

In this conventional technique, an erasing / recording head is separately formed as a composite head and is housed in a single case, and the head faces of the both heads are formed separately so as to have a bimodal shape. It is a composite magnetic head characterized in that

[Problems to be Solved by the Invention] In the above-described conventional technique, the heads for erasing / recording / reproducing are separately formed and housed in one case. Therefore, each head has a magnetic core. Since it is provided independently, it hinders overall miniaturization and
There was a problem that there were many wasteful parts of the core itself and it was uneconomical in terms of resources.

In addition to this, a combined erasing / recording / reproducing head with a common core has also been proposed, but since the top and bottom widths of the erasing gap and the recording / reproducing gap are the same, the final azimuth adjustment of the equipment used There is also a problem that the erasing head gap may overflow from the recording / reproducing track when performing a high-speed erasing mode or when the same track cannot be completely erased.

In order to eliminate the above-mentioned problems, the present invention uses a gap spacer in the erasing head gap of an erasing / recording / reproducing composite magnetic head that shares a central core with a sub-core having a vertical width larger than the vertical width of the gap. By interposing them on both sides of the track, even if the central core and the erasing core slightly protrude from the recording / reproducing track of the magnetic tape after the azimuth adjustment, the recorded signal of the track has a large vertical width. An object is to provide a composite magnetic head that can be completely erased by an erasing sub-core.

[Means for Solving the Problems] An object of the present invention described above is to dispose a first side core and a second side core, which form a pair having the same vertical width as the central core, on opposite sides of the central core so as to face each other. , The central core and the first side core are joined together with a gap spacer interposed between the front portions of the first side core and the central core, and a gap spacer is provided between the front portions of the second side core and the central core. The second side core is joined to the central core by interposing a sub-core piece having a vertical width larger than the vertical width of each core so as to be sandwiched therebetween, and a reproducing coil and erasing are respectively provided on the first and second side cores. It is achieved by winding a coil for use.

[Operation] In the erasing head gap of the combined erasing / recording / reproducing magnetic head sharing the central core, sub-cores having a vertical width dimension larger than the vertical width of the gap are provided so as to face each other with a gap spacer interposed therebetween. Even if the central core and the erasing core slightly protrude from the recording / reproducing track of the magnetic tape after the azimuth adjustment, the recorded signal on the track can be completely erased by the erasing sub-core having a large vertical width.

[Examples] Examples will be described with reference to the drawings.

First, as shown in FIGS. 1 and 2, the basic structure of the present invention is to sandwich a pair of I-shaped central cores A each having a magnetic plate such as permalloy laminated, and to form a pair having the same vertical width as the central cores A on both sides thereof. As shown in FIG. 1, a U-shaped first side core 1 and a second side core 2 in which magnetic plates such as eggplant permalloy are laminated are arranged so as to face each other.

Then, the central core A and the first side core 1 are joined as shown in FIG. 2 with a gap spacer 3 sandwiched between the front portions of the first side core 1 and the central core A, and the second side core 2 and the central core A and the second side core 2 with a gap spacer 4 interposed between the front portions of the central core A and the central core A.
The second side core 2 is joined to the central core A as shown in FIG. 2 with the sub-core pieces 5 and 5 made of a magnetic material such as a clad material having an upper and lower width larger than the upper and lower widths thereof facing each other.

Further, prior to this joining, a reproducing coil 6 and an erasing coil 7 are provided on the first and second side cores 1 and 2, respectively.
The composite magnetic head of the present invention is configured by winding by inserting the bobbin through the bobbins 8, 8.

As shown in FIG. 3, this composite magnetic head is mounted in a case C by a well-known means, and a fulcrum piece 11 provided on a substrate 10, for example.
Head mounting plate with the lower surface of case C attached to the upper end of 12
Then, the springs S are inserted into the male screws 13, 13 for adjusting the azimuth on both sides of the head mounting plate 12, and the female screw portion 14 of the substrate 10 is screwed and mounted.

In each figure, reference numeral 15 indicates a lead wire, T indicates a magnetic tape, t indicates a recording track on the magnetic tape T, and 8a indicates a bobbin hole.

Next, an example of using this composite magnetic head will be described.

First, as shown in FIG. 3, the magnetic head assembled as a tape recorder is temporarily fixed on the preliminary substrate 10 by the head mounting plate 12, and after the assembly, the azimuth adjustment for the magnetic tape T is performed.

That is, the recorded track t of the standard magnetic tape T recorded with a correct azimuth angle is reproduced through the head gap by the gap spacer 3 between the side core 1 for the reproducing head and the central core A while adjusting the azimuth. By gradually rotating one or both of the male screws 13 and 13, the head is tilted slightly with the fulcrum piece 11 as a fulcrum, and the azimuth is precisely adjusted as shown in FIG. 4 before shipment.

However, due to factors such as variations in the mounting accuracy of the cores 1, 2 and A for Case C and variations in the mounting of the tape guide, the state shown in FIG. There are many cases where the azimuth angle becomes accurate with a slight right descent (or right up).

Therefore, in the present invention, in the erasing head gap of the erasing / recording / reproducing composite magnetic head that shares the central core A, the sub-core pieces 5, 5 each having a vertical width larger than the vertical width of the gap are sandwiched by the gap spacers 4 on both sides thereof. Since the center core A and the erasing core 2 slightly protrude from the recording / reproducing track t of the magnetic tape T after the azimuth adjustment, the recorded signal of the track t is adjusted to the vertical width of It can be completely erased with the large erasing sub-core pieces 5, 5.

[Advantages of the Invention] Since the present invention is configured as described above, it has the following effects. That is, in the erasing head gap of the combined erasing / recording / reproducing magnetic head sharing the central core A, the sub-core pieces 5, 5 having a vertical width dimension larger than the vertical width of the gap are sandwiched between the gap spacers 4 and face each other. By doing so, even after the azimuth adjustment, even if the central core A and the erasing core 2 slightly protrude from the recording / reproducing track t of the magnetic tape T, the recorded signal of the track t is used for erasing with a large vertical width. The first effect is that the sub-core pieces 5 and 5 can be completely erased.

In addition, at the time of high-speed erasing of a magnetic tape in a high-speed erasable tape recorder, even if the high-speed running tape runs with some vertical swing, the recorded tracks are completely erased by the wide sub-core pieces 5, 5. There is a second effect that can be achieved.

Further, in the present invention, since the central core A is used both as a part of the erasing core and as a part of the recording / reproducing core, there is a third effect such as resource saving and space saving.

[Brief description of drawings]

Each of the drawings shows one embodiment of the present invention. FIG. 1 is an exploded perspective view of an essential part of a composite magnetic head, FIG. 2 is a perspective view showing a state after the same is assembled, FIG. FIG. 4 is a partially cutaway elevational view showing an example of a usage state. A ... Central core, 5 ... Sub-core piece 1,2 ... Side core, 6 ... Reproducing coil 3,4 ... Gap spacer, 7 ... Erase coil

Claims (1)

[Scope of utility model registration request] 1. A first pair having the same thickness in the track width direction as that of the central core A on both sides of the central core A.
The side core 1 and the second side core 2 of the
The center core A and the first side core 1 are joined to each other with a gap spacer 3 interposed between the front portions of the first side core 1 and the center core A, and the front sides of the second side core 2 and the center core A are joined together. The sub-core pieces 5, 5 having a thickness in the track width direction, which is larger than the thickness in the track width direction of the cores, are sandwiched between the parts to face each other.
Of the reproduction coil 6 connected to the side core 2 and the central core A of each of the first and second side cores 1 and 2.
And a composite magnetic head formed by winding the erasing coil 7.