JPS62277609A - Magnetic head - Google Patents

Abstract

PURPOSE:To attain the even height of magnetic heads by fixing the side face members to the both side faces of a magnetic head core via a level difference part and then fixing the head core to a head attachment member via said side face members. CONSTITUTION:A pair of magnetic substance blocks 8a and 8b are butted to each other with a prescribed space and many gaps 6 are formed to the butting face with prescribed parallel pitches (p). Thus a magnetic head core block 9 is obtained. Then an approximately U-shaped ceramic block 15 containing the adhering faces 12a formed in parallel with those gaps 6 in the form of comb teeth with the same pitches (p) of the 6 is adhered to the block 9 via an organic adhesive or glass. In this case, the faces 12a are processed by a grinding machine so that the space (h) between an end of the gap 6 and the face 12a satisfies a prescribed value. Then these adhered blocks are cut into pieces and both ends of each piece are cut. Thus magnetic head cores 3 are obtained. In such a way, the even height is secured among magnetic heads.

Description

[Detailed description of the invention] 3. Detailed description of the invention [Purpose of the invention] (Industrial application field) The present invention relates to a magnetic head.

(Prior Art) A magnetic head 1 used in a magnetic recording/reproducing device for recording or reproducing a video signal or a digital audio signal 3 is made of nonmagnetic gold, ceramic, or the like, as shown in FIGS. 8 and 9. A magnetic head core 3 is bonded to one surface 2a of a head base 2. As shown in FIG. 10, two magnetic heads 1 are attached to a rotary disk 4 by screws 5, facing each other at 180 degrees. In this case, a pair of magnetic heads 1 are mounted 180 degrees opposite each other.
As shown in FIG. 11, the magnetic head cores 3a, 3b
One end of the gaps 6a and 6b formed in each of the parts inevitably ends up being assembled with a predetermined step difference Δh.

This level difference accuracy is required to be less than 1 μm in order to obtain an accurate tape pattern (not shown). For this reason, in the past, the height h from the adhesive surface 2a of the helad base 2 to one end of the gaps 6a, 6b was approximately equal to the magnetic head core 3a,
3b and combine them, or by providing a set screw 7 on the rotating disk 4 as shown in FIG.
The level difference was adjusted by pushing up one side of the .

Such level difference adjustment is performed by adjusting the gap 8a, 6b between the magnetic head cores 3a, 3b with respect to the adhesive surface 2a of the helad base 2.
This was necessary because the position of the magnetic head cannot be fully controlled by conventional magnetic head manufacturing processes. That is, conventional magnetic heads have been manufactured by the method shown in FIGS. 12 and 13. In FIG. 12, a pair of magnetic blocks 8a, ab made of ferrite, sendust, etc. are butted against each other at a predetermined interval, and a large number of gaps 6 with the same pitch p are formed.
After forming a magnetic head core block 9 having a pitch p, a large number of wires 10 are brought into contact with each other at intervals equal to the pitch p. Then, the magnetic head core 3 is manufactured by a so-called wire saw method in which these wires 10 are vibrated in the direction of arrow A, abrasive grains are interposed between the wires 10 and the magnetic head block 9, and the magnetic head cores 3 are cut and divided into individual magnetic head cores 3. do. This wire saw one-type method has better mass productivity than a method of grinding and cutting by rotating a diamond or other grindstone, and is less likely to cause chips or cracks 12 on the cut surface 11 as shown in FIG. However, the pitch p of each wire 10 is unstable, and the distance between the cutting surface 11 and one end of the gap 6 cannot be controlled with high precision, resulting in uneven cutting of the wire 10 as shown in FIG. There has been a problem in that the cut surface 11 is bent due to movement and its flatness is deteriorated. As a result,
As shown in FIG. 14, the magnetic head core 3 cannot be accurately adhered to the adhesive surface 2a of the head base 2, resulting in a deviation ΔS. This method has the disadvantage that a precise gap position cannot be obtained.

(Problems to be Solved by the Invention) The present invention provides highly accurate control of the distance between the cutting surface 12 and one end of the gap 9 when cutting the magnetic head core block 9, which has been a problem in conventional magnetic heads. This magnetic head solves the problem that it is necessary to adjust the level difference when attaching a plurality of magnetic heads 1 to the rotating disk 4 because the magnetic head core 3 cannot be accurately bonded to the adhesive surface 2a of the helad base 2. The purpose is to provide the head.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention fixes side members to both sides of a magnetic head core via step portions, The magnetic head core is fixed to a head attachment member.

(Function) According to the above configuration, when manufacturing a magnetic head core by cutting and separating a magnetic head core block during the process of manufacturing a magnetic head, the height of the magnetic head can be increased without being affected by the machining accuracy of the cut surface. It is possible to equalize the
No height adjustment required.

(Embodiment) An embodiment of the magnetic head according to the present invention will be described below with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 to 5.

In these figures, parts that are the same as or equivalent to those of the conventional example shown in FIGS. 8 to 12 are denoted by the same reference numerals. A pair of magnetic blocks 8a and ab made of ferrite, sendust, or the like are butted against each other with a gap 6 formed at a predetermined interval to form the magnetic head core 3. Flat plate-shaped side members 12 made of ceramic or the like are adhered to both sides of the magnetic head core 3 with adhesive or glass. A stepped portion is formed between the lower surface 12a of the side member 12 and the lower surface of the magnetic head core 3, and a relief portion 13 wider than the width of the magnetic head core 3 is formed in the head base 2. The side member 12 is bonded to the upper surface 2a of the head base 2 with an adhesive, with the end portion 14 on one side of the portion 13 in contact with the stepped portion. In this case, the height h shown in FIG. 2 between one end of the gap 6 of the magnetic head core 3 and the lower surface 12a of the side member 12 is determined before the magnetic head core is cut and divided in the manufacturing process of the magnetic head core, which will be described later. , is independent of positional deviation, pitch deviation, and deterioration in flatness of the cut surface 11 during divisional cutting. Roughly, the width W between the gap 6 and the stepped portion of the magnetic head core 3 can be machined with high precision, and
By bringing the stepped portion of the magnetic head core 3 into contact with the magnetic head 4 and adhering it, the gap 6 formed in the magnetic head core 3 can be uniformly aligned with the center 2b of the head base 2. The head base 2 to which the magnetic head core 3 is adhered in this manner is fixed to the rotating disk 4 in the same manner as in the conventional case. Next, a method of manufacturing the magnetic head core 3 according to this embodiment will be explained with reference to FIGS. 3 to 5. First, as shown in FIG. 3, a pair of magnetic blocks 8a, 8b
are butted together at a predetermined interval, and a large number of gaps 6 are formed at a predetermined pitch p in parallel to the abutting surfaces of the magnetic head core block 9.
A ceramic block 15 having an adhesive surface 12a formed in a comb-like shape parallel to the gap 6 with the same pitch p as , is bonded with an organic adhesive or glass. In this case, the adhesive surface 12a
As shown in FIG. 4, similarly to the case of forming the gap 6 in the magnetic head core block 9, the gap 6 is processed by a grinding machine using a grindstone capable of high precision processing. Then, the magnetic head core block 9 and the ceramic block 15 are bonded together so that the distance between one end of the gap 6 and the bonding surface 12a is precisely a predetermined distance. After that, the wire is cut and divided using a wire saw using the wire 10 as in the conventional method.
By removing both ends as shown in FIG. 5, a magnetic head core 3 having an adhesive surface 12a that is free from misalignment of the cut surface 11 and deterioration of planarity can be obtained.

In the case of a magnetic head for azimuth recording, similar processing is possible if a comb-like adhesive surface 12a is formed in advance on the ceramic block 15 at a predetermined angle θA, as shown in FIG. is.

In the embodiment described above, the magnetic head core 3 is connected to the head base 2.
Although a case has been described in which the magnetic head core 3 is attached to the rotating disk 4 via the magnetic head core 3, the magnetic head core 3 may be directly attached to the rotating disk 4 as shown in FIG. In this case, relief portions 17 are formed in which the end portions 16 are symmetrically formed at opposite positions on the diameter of the rotating disk 4, and the magnetic head core 3 is attached to these end portions 16 as in the previous embodiment. and side member 12
The stepped portion may be bonded in contact with the step. Further, the number of magnetic head cores 3 mounted on the rotating disk 4 is not limited to two.

According to each of the embodiments described above, the magnetic head core block 9
without being affected by machining accuracy when cutting and dividing.
The heights of the magnetic heads are made uniform, and there is no need to sort out the magnetic heads or make troublesome height adjustments to make the heights uniform. Further, by using the stepped portion between the side member 12 and the magnetic head core 3 and bonding the magnetic head core 3 to the center line of the head base 2 or the rotating disk 4 using this stepped portion as an adhesion reference, the circle of the magnetic head core 3 is Highly accurate position regulation in the circumferential direction can be performed.

[Effects of the Invention] As described above, according to the present invention, the side members are fixed to both sides of the magnetic head core so that the magnetic head core can be fixed to the head attachment member via these side members. There is no need to adjust the level difference when mounting the head on the rotating disk, and the head can be mounted at the correct position.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the magnetic head according to the present invention, FIG. 2 is a front view of FIG. 5 is a perspective view showing a magnetic head core according to this embodiment, FIGS. 6 and 7 are a plan view and a perspective view, respectively, showing another embodiment of the present invention, and FIGS. 8 and 7 are respectively a perspective view and a plan view. Figure 9 shows a plan view and a side view of a conventional magnetic head, respectively.
0, FIG. 11, and FIG. 14 are side views showing problems with conventional magnetic heads, and FIGS. 12 and 13 are plan views and side views, respectively, showing a method of manufacturing the conventional magnetic head. 1...Magnetic head 2...Head base 3...Magnetic head core 4...Rotating disk 6...Gap 8...Magnetic block 12...Side member 12a...Adhesive surface (face-to-face interview) Agent: Patent Attorney Norihiro Chika Hiroshi Uji

Claims (1)

[Claims] The magnetic head core includes a magnetic head core integrally formed by abutting a pair of magnetic blocks with a gap therebetween, and side members fixed to both sides of the core via step portions, and the A magnetic head characterized in that a magnetic head core is fixed to a head attachment member.