JPS5927969B2 - Manufacturing method of centrifugal magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to improve azimuth precision and workability by cutting out a plurality of centrifugal magnetic heads from a single magnetic head block structure. The present invention relates to a method for manufacturing a head.

As is well known, in a centrifugal force type magnetic head, the head chip surface is
A magnetic disk is moved so as to face the outer peripheral surface of the rotating drum, is balanced at a predetermined movement position determined by the spring constant of the magnetic tape, the spring constant of the magnetic head device, etc., and is in sliding contact with the rotating drum. Maintains appropriate contact pressure against the tape. The centrifugal force type magnetic head includes a head chip that acts as an electromagnetic transducer, a spring member that elastically moves the head chip as described above under the influence of centrifugal force, and a and a base member for fixing the head chip to a rotating member such as a rotating drum. These three components are related to each other as shown in FIG. That is, the head chip 1 is attached to the spring member 2, and the thus attached member is adhered so as to abut against the base member 3, and the above three components are integrated to form a magnetic head. Ru. By the way, in order to combine the above three components, the head chip 1 and the spring member 2, and the spring member 2 and the base member 3 are arranged parallel to each other on an accurate reference plane or reference line, and the parallelism is maintained correctly. It must be.

However, this method of combining three members to form a single magnetic head has a small structure and is difficult to assemble, resulting in variations in the accuracy of the combination, as shown in Figure 2. Moreover, not only does the height of the head chip vary depending on the expansion and contraction of the spring member 2, but also the surface of the head chip does not come into uniform sliding contact with the running magnetic tape.

This appears as a tracking deviation on the magnetic tape, resulting in a reduction in image quality due to crosstalk. In addition, as shown in Figure 3, the tracking center of the compatible tape shifts due to azimuth deviation, and if this becomes too large, not only will tracking become impossible, but
Azimuth loss deteriorates high frequency reproduction sensitivity, causing a so-called overmodulation phenomenon. In order to eliminate such structural defects of the conventional centrifugal magnetic head device, the present invention provides a first core block having a groove for coil winding, and a first core block bonded opposite to the first core block. A core head block consisting of two core blocks was bored out leaving the required head tip width, and then the core head block was glued together with a base block with an elastic cylindrical block sandwiched between them. This invention proposes a novel method for manufacturing a centrifugal force type magnetic head, which attempts to obtain a magnetic head device with high dimensional accuracy by cutting out a plurality of magnetic heads from a block structure. below,
Embodiments of the present invention will be described with reference to the drawings. FIG. 4 is a perspective view of a core block made of ferrite core etc.
The core block is formed by a first core block 5 having a groove 4 for coil winding, and a second core block 6 bonded opposite to the first core block 5. Among the gaps made by the magnetic tape, a head spacer (not shown) made of a non-magnetic material (glass, etc.) is especially placed on the sliding contact side of the magnetic tape.
is intervened. Next, the integrated core block is bored leaving a predetermined width of the head tip 7 determined by a predetermined tracking width, as shown in FIG. As shown in the figure, the base 8 of the core block supporting the remaining 7 groups of head chips is glued onto an elastic cylindrical block 9 (corresponding to the spring member 2VC) made of carbon fiber or the like, and 9 is glued onto a base block 10 for a base plate, which is attached to a rotating member such as a rotating drum. Note that such bonding is performed accurately along the bonding reference line of each block. And such core procs 5, 6,
The elastic cylindrical block 9 and the base block 10 have predetermined positions where they should be pasted or where spot welding should be performed, and the length of the reference plane and reference line stabilizes the degree of bonding and makes the work easier. Sexuality improves. Next, the three construction blocks as shown in FIG. 5 are cut along the dotted lines.

This cutting is carried out by well-known means such as a grindstone, a laser beam, an electron beam, etc., and as shown in FIG. . That is, the magnetic head device obtained through this process has the following characteristics as described above.
Since the reference plane and the reference line are long, there is little variation in the accuracy of each cut out magnetic head device, and the overall accuracy is improved. Therefore, if the above-mentioned three constituent processes are selected correctly and cutting is performed precisely, the above-mentioned tracking deviation, azimuth deviation, etc. cannot occur in the magnetic head device alone. Furthermore, if the above-mentioned constituent blocks are joined accurately, each cut-out magnetic head device will have even more uniform quality. Furthermore, workability is significantly improved compared to the conventional method of gluing each of the magnetic head devices individually. As described above, the present invention provides a core head block consisting of a first core block having a groove for coil winding and a second core block bonded opposite to the first core block. After boring, leaving the width of the head tip, the core head block was glued together with the base block, sandwiching the elastic cylindrical block, and a plurality of magnetic heads were cut out from the bonded block structure. As a result, centrifugal force type magnetic head devices can be mass-produced with precision and good workability.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the conventional method of assembling a centrifugal magnetic head, and Figures 2 and 3 show that the magnetic head assembled by the conventional method causes height deviation and azimuth deviation, respectively. It is a side view and a front view of a state. Fig. 4 is a perspective view of a head block used in carrying out the present invention, Fig. 5 is a perspective view of a head block, an elastic cylindrical block, and a base block bonded together, and Fig. 6 is a cutout of each block glued together. This is a magnetic head composed of 4...Groove, 5,6...Core block, 7...Head chip group, 8...
Base, 9... Cylindrical block, 10...
Base block.

Claims (1)

[Claims] 1. A first core block having a groove for coil winding and a core head block consisting of a second core block bonded opposite to the first core block are placed in the middle while leaving the required head chip width. After drilling, the core head block is glued together with a base block so as to sandwich an elastic cylindrical block, and a plurality of magnetic heads are cut out from the thus glued block structure to manufacture a centrifugal magnetic head. Method.