JPS6148113A - Two-element magnetic head - Google Patents

Abstract

PURPOSE:To apply conventional winding work even to narrow head gap without any modification by providing asymmetrically a nonmagnetic core and a manetic core to the right and left, and forming a gap part dividing the magnetic core to the right and left at the symmetrical center. CONSTITUTION:A magnetic head has the 1st core block 12 and the 2nd core block 13 bonded in the direction orthogonal to the track and the 2nd core block is bonded to the 1st core block 12 in the state replacing the right/left sides. The 1st and 2nd core blocks comprise the magnetic core 14 asymmetrical to the right and left and the nonmagnetic core 15, the magnetic core 14 has a size exceeding the symmetrical center position to which the gap 16 is formed and winding holes 18, 19 are penetrated to the nearly symmetirical position of the symmetrical center formed with the gap 16. The slot for the winding hole 18 is a deep slot reaching the symmetrical center position and windings 50, 60 are wound to each of the winding holes 18, 19.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an Ik head used for reading and writing high-density recording media.
The present invention relates to a two-prong type magnetic head that enables circular reading or reading (continuously track by track) by electrically switching the head without having to move the head over the area.

゛(Cost of invention)
2 large coercive force suitable for high recording density recording!
Nametal tapes and metal disks have been developed.

For example, when recording images captured by an electronic sprue camera, the interval between recording tracks on a metal disk is 100.
It is set to approximately 11 μm, and each screen uses 2 tracks to record 11 times.

Therefore, the magnetic head used for re-reading such high-density recording media has a very narrow center-to-center distance of 100 μm between two tracks that record one screen, and requires mechanical head feeding. Because it is difficult, 2
It has been considered to use a two-element magnetic head that is integrally equipped with magnetic heads for tracks.

FIG. 8 shows an example of a conventional two-element magnetic head used in such high-density recording media.
．． There are six structures in which a first magnetic head 1 and a second magnetic head 2, each of which has a magnetic head of 5, are joined via a spacer 3. This magnetic head 1.2 has a core block 7 formed with a winding groove 6 on the right side and a core block 8 on the left side joined at the center to form a gear r.
Each core block 7.8 has a laminated structure in which a magnetic alloy thin piece 10 is sandwiched between non-magnetic auxiliary cores 11 from both sides.

Here, the magnetic alloy strip 10 of the magnetic head is designed to have saturation (4-terminal density is sufficiently large so that saturation of the head core does not occur when recording on a metal recording medium, and to be thin so as to reduce eddy current loss. Due to reasons such as low core loss in the frequency band, Sendust, Permalloy,
A piece of soft magnetic alloy such as amorphous is used.

(Problems to be Solved by the Invention) However, in such a conventional two-element magnetic head, it is difficult to form an integral structure in which the interval between the two magnetic heads matches the track width of the high-density recording medium. It was difficult.

That is, if the center-to-center distance 111fFTP of two tracks recording one screen on a high-density recording medium is 100 μm, the inner distance between the heads 1 and 2 due to the spacer 3 is 2071.
m P1 degree. When winding the magnetic head 1.2 with the winding 4.5 using insulated wire, it is required to have the strength to withstand a certain amount of tension, and to ensure this strength, the wire must be at least 40 μm in diameter A feeder wire is required, and if it is less than that, the wire breakage rate during winding will always be high, making it impractical.

Therefore, using the minimum diameter of 40 μm + 7) il wire, it is impossible to secure the inner spacing of the track center distance TP of ia L' /,: 1°2 of the li wire head, and the conventional structure is particularly difficult for high-density recording. It was difficult to make a two-part magnetic head.

On the other hand, since the winding space of the f41 head is narrow,
Although it is possible to use a thin film process without winding,
The process of repeating the conductor pattern and insulation coating on a three-dimensional surface is required, and the number of windings is usually about 10 to 20 turns, so there is a problem that it takes a lot of time and costs. there were.

(Object of the Invention) The present invention has been made in view of such conventional problems, and has a head spacing that is suitable for the narrow inter-track distance required for high-density recording. Another object of the present invention is to provide a two-element magnetic head in which ordinary winding work can be performed as is.

(Summary of the Invention 22 > To achieve this object), the present invention comprises a non-magnetic core portion and a magnetic 41 core portion asymmetrically, and the magnetic core portion has a non-magnetic tl.
A V-tube part is formed on the core side, which has a size exceeding the symmetrical center point, and divides the magnetic core part left and right at the symmetrical center position, and further divides the non-magnetic core part and the magnetic core part. A first winding groove formed with one winding groove at each symmetrical position.
A structure in which the core block has a core block and a second core block, and the winding wire is wound in each of the winding grooves passed through r1 after joining the second core block with the left and right swapped to the first core block. What happened?

(Embodiment) FIG. 1 is a perspective view showing one embodiment of the present invention.
Record the plan view in the figure] - Know and show the relationship with the rack.

First, to explain the configuration, the magnetic head of the present invention (first core block [1 core block 1
2 and a second core block 13, and the second core block 13 is joined to the first core block 12 with the right side 71 swapped.

As for the first and second core block numbers, the first core block shown in the figure is composed of a magnetic core section 14 and a non-magnetic core section 15, which are asymmetrical to the left and right, as seen from the front of the block 12. The portion 14 has a size exceeding the symmetrical center position where the gap 16 is formed, and is formed with one winding hole 18 and 19 at a substantially symmetrical position with respect to the symmetrical center where the gap 16 is formed. The center of symmetry for wire hole 18 is 1i9f
The windings 50 and 60 are wound around the winding holes 18 and 19, respectively.

Figure 3 number: 1st or 2nd in the embodiment of Figure 1.2
The core block 12 or 13 is taken out and shown, and the magnetic core part 14 and the non-magnetic core part 15 are joined to each other, and the magnetic core part 14 has a symmetrical center line 4.
It has a divided structure divided into a core part 14a with a winding hole 18 located on the right side of 0, and a core part 14b located on the left side of a symmetry center line 40, and the divided structure of core parts 14a and 14b is as follows. This is due to the manufacturing method of the core block, which will be explained later. Further, the magnetic core portion 14 has a magnetic alloy thin piece 20 having a thickness corresponding to the track width at the center, and auxiliary cores 2 made of a non-magnetic material are attached from both sides of this magnetic alloy thin piece 20.
It has a laminated structure with 1 sandwiched in between.

Further, the winding hole 18 formed through the magnetic core portion 14 and the winding hole formed through the non-F4i core portion 15 have the following dimensional relationship.

That is, the depth of the groove for the winding hole 18 with respect to the symmetry center line 40 where the gear knob 16 is formed is a, and the symmetry center line 4
The width of the left core portion 14b with respect to 0 is b1! : Zuruto,
A portion C of the winding hole 18 where the wire is wound is given by c-a-b, and a groove for the winding hole 19 having the same depth as this groove depth C is formed on the non-magnetic core portion 15 side. In addition, the winding holes 19 are formed at substantially symmetrical positions with respect to the groove width C.

FIG. 4 shows an assembled state of the core block of a two-element magnetic head used in the present invention using two core blocks having the structure shown in FIG. Reverse the core block 13 on the left side so that the winding hole 18 of the first block matches the winding hole 19 of the second core block, and the winding hole of the first core block 12 matches the winding hole 18 of the first block. The two core blocks 12 and 13 are joined so that the winding hole 18 of the second core block 13 coincides with the winding hole 19 of the second core block 13 .

In joining the first and second core blocks with their left and right sides swapped in this way, as is clear from the plan view of FIG.
The misalignment of the J5 GJ gear 1r knob 16 on the two core blocks 12 and 13 is Δ0. The two core blocks are aligned in the lateral direction during bonding so that the distance TP between the two tracks 23a and 23b in the d high-density recording medium 22 is 10. 12 and 13 are bonded and fixed with adhesive 27.

In such a state where the left and right sides of the first and second core blocks are swapped (J and S are connected to the joint of .), a 5-wire hole is formed at 1L/ζ11'lq. (, 1-T of the L bundle, the same slow rotation of 50° and 60° as with the closed-type air head is possible.

Next, the rounding and reading operations by the magnetic head of the embodiment of the present invention shown in FIG. 1.2 will be explained.

First, taking the example of writing information to a high-density recording medium, for example, when a signal current is passed through the winding 50 belonging to the right core block, the winding 50 is connected to the first core block 12.
Since it penetrates through the magnetic core part 14 in the first
Magnetic flux flows only to the magnetic alloy thin piece 20a of the magnetic core portion 14 in the core block 12 of J5, and the recording kidney i is transferred to one track 23a of the high-density recording medium 22 via the Gillep 16.
It is possible to create a field and record in November. At this time, since the winding hole 18 of the second core block 13 passes through the non-magnetic core part 15, the second core block 13
No magnetic flux flows through the magnetic alloy thin piece 20b, and no recording is performed on the other track 23b of the high VFI recording medium 22. After recording on one track 23a is completed in this manner, the supply of No. 13 current is switched to the straight line 50, and recording is performed on the other track 23b in the same manner.

Next, the 1-rack 23a of the high-density recording medium 22.

23b l,: The recorded H1 is read by rotating the recording medium with respect to the magnetic head, and the recorded information on the track 23a is read out from the magnetic alloy thin piece 20 in the first core block 12 at J3.
A is given a magnetic field change, and as a result, the recording information CI is applied to the winding 50.
A signal current is generated according to the track 231), while the track 231)
1 to cause a change in the magnetic field to cause the winding 60 to change according to the recorded information.
, :signal 1) Generate current and read out one screen by switching to signal detection of the winding 60 at the stage when the signal detection of the winding 50 is completed, and the recorded information can be read out.

FIG. 5 is a two-dimensional diagram showing the manufacturing process of the two-element magnetic head of the present invention shown in FIG. 1.2.

First, in order to form a magnetic alloy thin piece, two amorphous magnetic alloy thin pieces are laminated, and the thickness of the layer is made to match the track width. Of course, other magnetic metals may be used as the noisy alloy flakes, such as magnetic metals. You may also use thin pieces of permalloy, etc.

Next, as shown in FIG. 5(a), a plurality of arbitrary magnetic alloy thin pieces 20 (45113) of two magnetic alloy thin pieces are formed.
In the lFi diagram, only two, 20a and 20b, are shown.
After interposing a non-magnetic core material 24 made of glass, ceramic, etc. between the two pipes, they are joined together. Also, a laminated block 25 is made by gluing a large number of non-magnetic core materials 24 and magnetic alloy thin pieces 20 together in a receiving position. At the same time, a non-magnetic core material 26 with a winding tf419 processed in advance is prepared and bonded and fixed to the left side of the laminated block 25. Next, the laminated block 25 is cut along the dotted line at the receiving position, and as shown in FIG.
) Divide into two as shown. Next, the winding hole 18 is formed in the right laminated block [1 block 25] which is divided into two parts, and the laminated block 25a and the left laminated block 251 (integrated with the non-magnetic core material 26) are butted together. After precision polishing, Si Q2 for gap formation is applied.
A film is deposited to a predetermined thickness.

Subsequently, as shown in FIG. 5(C), both blocks are bonded and fixed using an adhesive 27 using an abutment V while performing alignment 1 to prevent track deviation.

Once this bonding and fixing is completed, cut the core block at the position shown by the dashed line and separate it into the first and second core blocks. Next, cut the thickness of the auxiliary core material. is polished until it reaches a predetermined thickness determined by the track pitch, and then, as shown in Figure 5(d), one =
1. Flip the core block left and right and glue and fix it to the other core block.

In this case, the alignment must be performed so that the deviation ΔW of the gap between both core blocks shown in FIG. 2 is minimized.

In addition, when the core block divided into two parts is swapped left and right and joined as shown in Fig. 5(d), the depth d of both gaps is the same as that of the single block as shown in Fig. 5(C). Since the cut length is 1', the gap depths d match perfectly, and no variation in characteristics occurs.

Subsequently, as shown in FIG. 5(C), the upper surface of the head that is to be slid onto the recording medium is polished into a cylindrical shape, and the winding hole 1 is finally formed.
8.19", each with a predetermined number of turns of ff wire 50.6
0 can be applied to complete the magnetic head.

FIG. 6 is an explanatory diagram showing another embodiment of the present invention, and this embodiment has J3
It is characterized in that the auxiliary core forming the magnetic core portion of the GJ is made of a magnetic material.

That is, in the first and second core blocks 12.13, l
- The third Shirome raw core part 14 is made of a laminated structure (14 structure) in which a magnetic alloy thin piece 16 is sandwiched between magnetic material auxiliary cores 30 from both sides, and the magnetic material auxiliary core 30 is made of a magnetic material such as, for example, Ferraih. Specifically, Mn-Zn-ferrite single crystal is used as the magnetic material.Furthermore, by using the magnetic auxiliary core 30, the magnetic auxiliary core 3
The IiQ dynamic surface side that contacts the recording medium 0 must be formed of a non-magnetic material 32, and this non-magnetic material 32 is made of, for example, glass or ceramic.

In this way, when the auxiliary core used in the magnetic core portion 14 is a magnetic auxiliary core, the efficiency of the head can be increased compared to the non-magnetic auxiliary core in the embodiment shown in FIG. 1.2. Of course, the magnetic auxiliary cores 30 and j) may be laminated with gold alloy.

FIG. 7 is an explanatory diagram showing another embodiment of the present invention, and this embodiment is used to provide magnetic shielding between two magnetic head elements consisting of a first core block 12 and a second core block 13. , is characterized in that the first core block 12 and the second core block 13 are bonded and fixed via a metal foil 34. In this case, the thickness of the metal foil 34 is approximately 5 to 3071 mm.
m, so considering the thickness of this metal foil 34,
In the H'rN step shown in FIG. 5, the bonding surfaces of each core block are polished to ensure a specified inter-track distance TP. Further, it goes without saying that a hole for forming one winding hole 18° is pre-drilled at a predetermined position in the metal foil 34 by etching or the like.

(Effects of the Invention) As explained above, according to the present invention, a two-element magnetic head used for 45-bit 2-track system winding and continuous output on a high-density recording medium can be mounted in an appropriate winding space. The two-element head, which was previously difficult to manufacture, can be made into an integrated structure while ensuring the same properties as the one-element head.The only thing that can be done is winding the winding in the winding groove formed in the head core in exactly the same way as a one-element head. ¥! A magnetic head can be easily realized, and magnetic recording and reproduction can be performed with high image quality and high density using two-track recording and reproduction.

In addition, because the core block of a two-element magnetic head is manufactured by separating a single core block with an asymmetrical structure and joining it in opposite directions to the left, the core blocks of each head can be made from the same block. Since the block is 1q, mass production is high, and the depth of t (for general winding) is the same when cutting from the block [l! Since it is 1q, there is no difference between the two, and a two-element magnetic head with uniform characteristics can be manufactured.

4. Drawing (7) ff! Y11 % pJ4 Fig. 1 is a perspective view showing one embodiment of Kikomei, Fig. 2 is a perspective view showing an example of the
FIG. 3 is a perspective view showing the core block of the embodiment shown in FIG. 1, FIG. 4 is an explanatory view showing the joined state of two core blocks, and FIG. FIG. 6.7 is a perspective view showing another embodiment of the present invention, and FIG. 8 is an explanatory view showing a conventional example.

12: First core block 13: Second core block 14: Ii sexual core part 15: Non-magnetic core part 16: Gisetsubu 18.19: Winding hole 20a, 20b: Magnetic alloy thin piece 21: Auxiliary core 22: High density recording medium 23a, 231): l~rack 24.26: Non-permanent core material 25:&5 layer block 27: Adhesive 30: Nephritic auxiliary core 32: Non-magnetic material 34: Metal foil 40: Symmetry center line 50.60: Winding wire Figure 1 Figure 3 Figure 4 /, 5 /4 Figure 5 (C) (d)

Claims (4)

[Claims] (1) Equipped with a non-magnetic core part and a magnetic core part asymmetrically,
The magnetic core part has a size exceeding the symmetric center position on the non-magnetic core part side, and is provided with a gap part separating the magnetic core part left and right at the symmetric center position, and further has a gap part between the non-magnetic core part and the magnetic core part. It is characterized by having a structure in which two core blocks each having a winding hole formed therethrough are swapped left and right and joined together, and then a winding wire is wound around each of the winding holes that communicate the two core blocks. Two-element magnetic head. (2) The two-element magnetic head according to claim 1, wherein the magnetic core portion has a laminated structure in which a magnetic alloy thin piece is sandwiched between non-magnetic auxiliary cores on both sides. (3) The magnetic core portion has a laminated structure in which both sides of a magnetic alloy thin piece are sandwiched between magnetic auxiliary cores, and the sliding surface side of the magnetic auxiliary core that contacts the recording medium is formed of a non-magnetic material. A two-element magnetic head according to claim 1. (4) The second aspect of claim 1, characterized in that a metal foil is interposed between the joint surfaces of the two core blocks.
element magnetic head.