JPH03254408A - Magnetic head - Google Patents

Abstract

PURPOSE:To provide better workability and higher productivity by providing through-holes to be respectively inserted with the parts with project to the opposite side from the medium-facing surfaces of plural head parts mounted to slider parts in a holder. CONSTITUTION:The plural head parts 2, 3, 5, 6 are fixed to the slider parts 1, 4 by respectively inserting the plural head parts 2, 3, 5, 6 into the plural through-holes 12 so as to expose a magnetic gap to the medium-facing surfaces. The slider parts 1, 4 and a holder 12 are joined to each other while the parts project to the opposite from the medium-facing surfaces of the head parts 2, 3, 5, 6 are respectively held inserted into the through-holes 2a of the holder 12. There is no need for providing members for providing magnetic shields between the head parts 2, 3, 5, 6 in the slider parts 1, 4. The need for working the center shield to the accurate size is eliminated in this way and the magnetic head with which the workability is good is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic head used in a magnetic recording and reproducing apparatus that records data on a magnetic recording medium and reads data from a magnetic recording medium.

Prior Art FIGS. 4 and 5 are an exploded perspective view and a side sectional view showing a conventional magnetic head. In FIGS. 4 and 5, reference numeral 1 denotes a slider portion made of an oxide magnetic material such as ferrite, and raised portions 1a and lb are provided on the medium facing surface side of the slider portion 1, respectively. Two through holes 1c and ld are provided in the raised portion 1a.

The magnetic gap portion of the recording head 2 is inserted into the through hole 1c, and the end of the magnetic gear system of the recording head 2 is exposed to the medium facing surface of the slider section 1, and the end is a part of the medium facing surface. It consists of The magnetic gap portion of the reproducing head 3 is inserted into the through hole 1d, and the end of the reproducing head 3 on the magnetic gap side is exposed to the medium facing surface, and that end constitutes a part of the medium facing surface. are doing. 4 is a slider portion, and the slider portion 4 is provided with a raised portion 4a. Through holes 4b and 4c are provided in the raised portion 4a, respectively. The magnetic gap part of the recording head 5 is inserted into the through hole 4b, and the end of the recording head 5 on the magnetic gear/tube side is exposed to the surface facing the rainy season body, and that end is part of the medium facing surface. It consists of

Further, the end of the reproducing head 6 on the magnetic gap side is inserted into the through hole 4C, and is exposed to the medium facing surface, so that the end constitutes a part of the medium facing surface.

Since the recording head 2 and the recording head 5 have the same configuration, their configuration will be explained using FIG. 5. In the recording head 2, an abbreviated core 2a and an abbreviated core 2b are joined together via a non-magnetic material that forms a magnetic gap.
A back core 2c is bonded to the end opposite to the gap-facing surface so as to form a magnetic circuit. core 2a
is provided with a recording coil 2d. Recording head 5
has a similar configuration.

Since the reproducing head 3 and the reproducing head 6 have the same structure, the structure will be explained using FIG. 5. The reproducing head 6 has an abbreviated core 6a and an abbreviated core 6b joined together via a non-magnetic material that forms a magnetic gap, and the end of the core 6a and core 6b opposite to the gap facing surface side. A back core 6C is joined to constitute a magnetic circuit. In addition, the core 6a and the core 6b each have a reproducing bobbin 6d,
6e are provided respectively. The reason why two reproducing bobbins are provided in the reproducing head 6 is to extend the resonant frequency and improve the reproducing characteristics. Reference numeral 7 denotes a plate-shaped center shield made of a magnetic material, and the center shield 7 has a slider portion 1 sandwiching the center shield 7.
and the slider portion 4 are joined to the center shield 7. At this time, the recording head 2 and the reproducing head 6 are placed next to each other with the center shield 7 in between, and the recording head 5
The slider parts 1 and 4 are joined to the center shield 7 so that the read head 3 and the playback head 3 are adjacent to each other with the center shield 7 interposed therebetween. Further, the end surface of the center shield 7 on the side facing the medium is flush with the surface of the slider sections 1 and 4 in the vicinity of the joints with the center shield 7. 8 is a protective material that covers the recording heads 2, 5 and the reproducing heads 3, 6 that protrude on the side opposite to the medium facing surface side of the slider sections 1, 4;
is made of silicone rubber or the like. 9 is a holder, and the holder 9 is provided with one through hole 9a. A portion covered by the protected forest 8 is inserted into the through hole 9a, and one opening of the through hole 9a is closed by the slider parts 1, 4 and the center shield 7. Further, the holder 9 is made of a conductive material such as aluminum.

Reference numeral 10 denotes an erasing head attached to the end face of the four slider sections of the holder 9.

The operation of the magnetic head constructed as described above will be described below.

First, the recording method will be explained. As shown in FIG. 5, when the magnetic tape runs on the medium-facing surface of the magnetic head in the direction of arrow A, the recording head 5 records data on the magnetic tape, and immediately after the reproducing head 3 reads out the recorded data, do. When the magnetic tape runs on the medium facing surface of the magnetic head in the direction opposite to the direction of arrow A shown in FIG. Then, verify.

During playback, data is read out by the playback head.

Problems to be Solved by the Invention However, in the conventional configuration, if a gap is created between the end surface 7a of the center shield 7 and the inner surface 9b of the holder 9, for example, magnetic flux leaks from the gap and enters the other head, causing playback. Noise may occur in the output and errors may occur when reading or writing data, so make sure that there are no gaps as much as possible (the dimensions of the center shield 7 must be machined with high precision). Workability was poor and productivity did not improve.

The present invention solves the above-mentioned conventional problems, and aims to provide a magnetic head with good workability without the need to precisely process the dimensions of the center shield.

Means for Solving the Problems In order to achieve this object, the holder is provided with through holes into which portions of a plurality of head parts attached to the slider part protruding on the side opposite to the medium facing surface are respectively inserted.

Function: With this configuration, there is no need to provide the slider section with a member for magnetic shielding between the head sections.

Embodiment FIGS. 1 and 2 are an exploded perspective view and a sectional view, respectively, showing a magnetic head in an embodiment of the present invention. In FIGS. 1 and 2, l and 4 are slider parts, respectively;
2 and 5 are recording heads, 3 and 6 are playback heads, and IO is an erase core, which are the same as the conventional structure. Reference numeral 11 denotes a rod-shaped shield body, and the slider part 1 and the slider part 4 are joined to the shield body 11 so as to sandwich the shield body 11 therebetween. Also shield body 1
1 is made of a magnetic material.

The thickness of the magnetic material of the shield body 11 is 1.4 mm in the slider portion.
The thickness is approximately the same as the thickness of the portion near the shield body 11.

Reference numeral 12 denotes a holder made of a conductive metal material such as aluminum, and the holder 12 has slider parts 1 and 4 of the recording heads 2 and 5 and the reproduction heads 3 and 6, respectively, protruding from the side opposite to the medium facing surface side. Through hole 12 into which the part is inserted
Four a are provided. Further, when the portions of the slider portions 1.4 of the recording heads 2, 5 and the reproducing heads 3, 6 that protrude on the side opposite to the medium facing surface side have been inserted into the through holes 12a, the slider portions 1.4 are completely inserted into the through holes 12a. Through hole 12a
covers one opening. At this time, although not shown in FIG. 1, the portions of the slider portions 1.4 of the recording head 2.5 and reproducing heads 3, 6 that protrude to the side opposite to the medium facing surface are covered with a protective material 13 such as silicone rubber. It is being said.

14 is a terminal plate provided in the through hole 12a, and a conducting wire wound around a coil is connected to the terminal plate 14. 15 is a mounting hole provided on the outer surface of the holder 12. When the holder 12 is assembled into another device, a screw is inserted into the mounting hole 15 to fix the holder 12 in the device.

A method of manufacturing the magnetic head constructed as described above will now be described.

First, the slider parts 1 and 4 are joined via the shield plate 5, and the raised parts 1a and l are attached to the slider parts 1 and 4, respectively.
b and a raised portion 4a are provided. Next, the raised part 1
Through holes 1c and ld are provided in a, respectively. Further, through holes 4b and 4c are provided in the raised portion 4a, respectively. Next, the recording heads 2 and 5 are each inserted into the through hole IC94b so that the magnetic gap is exposed to the surface facing the medium, and fixed with an adhesive or the like. Further, the reproducing heads 3 and 6 are respectively inserted into the through holes 1d and 4c so that the magnetic gaps are exposed to the surface facing the medium, and fixed with adhesive or the like. Next, the protruding portions of the reproducing head and the recording head on the side opposite to the medium facing surface are covered and protected with a protection layer 13 made of silicone rubber or the like. Next, a holder 12 provided with four through holes 12a is prepared. Next, the parts of the reproducing head and the recording head that protrude to the side opposite to the medium facing surface are inserted into the through hole 12a until one opening of the through hole 12a is closed by the slider parts 1 and 4.
insert. Next, resin or the like is poured into the through hole 12a to fix the slider portion 1.4 and the holder 12 to each other.

The shielding effect of the magnetic head constructed as described above will be explained below with reference to FIG.

FIG. 3 is a schematic diagram showing the flow of magnetic flux in this embodiment.

Holder 1 made of conductive metal as shown in Figure 3
Since each head is surrounded by the inner wall 12b of 2, when the leakage magnetic flux of each head enters the inner wall 12b, eddy current is generated, canceling the leakage magnetic flux and leaking magnetic flux to the head in the adjacent through hole 12a. Since it does not flow in, a sufficient shielding effect can be obtained.

As described above, in this embodiment, the through holes 12a are provided in which the protruding portions of the recording heads 2, 5 and the reproducing heads 3, 6 held by the slider portion 1.4 on the side opposite to the medium facing surface are inserted. By providing it in the holder 12, there is no need to provide a center shield on the slider parts 1 and 4 as in the past, and accordingly, it is possible to process the center shield in the width direction when inserting the slider part into the holder, which was required in the past. Since this becomes unnecessary, workability improves and productivity improves.

In this embodiment, the case of 2 channels was explained, but the case of 4 channels with 4 recording heads and 4 reproducing heads was explained.
It goes without saying that similar effects can be obtained in multi-channel magnetic heads such as channel magnetic heads.

Effects of the Invention The present invention provides a through-hole in the holder into which the protruding portions of a plurality of head parts attached to the slider part protruding on the side opposite to the medium facing surface are respectively inserted. Since there is no need to provide a member for magnetic shielding, it is possible to eliminate the conventional precision machining process when attaching the slider to the holder, improving work efficiency and increasing productivity. improves.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing a magnetic head in an embodiment of the present invention, FIG. 2 is a sectional view on the same side, FIG. 3 is a sectional view showing leakage magnetic flux of a magnetic head in a non-embodiment, and FIG. FIG. 5 is an exploded perspective view showing a conventional magnetic head, and FIG. 5 is a sectional view thereof. 1.4... Slider section 2.5... Recording head 3.6... Playback head 10... Erasing core 11... Shield Body 12...Holder 1, 2 a...Through hole 13...Protective material

Claims (1)

[Claims] The slider includes a head portion, a slider having a plurality of holes penetrating from the medium facing surface to the opposite side, and a holder having a plurality of through holes, and the plurality of holes are arranged so that the magnetic gap is exposed to the medium facing surface. The plurality of head parts are respectively inserted and fixed to the slider part, and the parts of the head parts protruding on the side opposite to the medium facing surface are respectively inserted into the through holes of the holder. A magnetic head characterized in that a slider portion and the holder are joined to each other.