JPS6350764B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a magnetic head suitable for use in a VTR (video tape recorder). In a normal VTR, a magnetic head 1 is attached to the tip of a head base 3 attached to the outer periphery of a disk 2, as shown in FIG. There is. The tape 5 is wound around half the circumference of the cylinder 4 as shown in FIG. The situation becomes unstable. On the other hand, the disk 2 to which the magnetic head 1 is attached is positioned in a predetermined positional relationship with respect to the cylinders 4 in relation to the track position on the tape 5. However, due to an error in installing the disk 2 and an error in installing the head base 3, after installing the head base 3, it is necessary to move the level difference adjustment screw 8 provided on the disk 2 up and down and press the head base 3 to place it in the specified position. I'm trying to adjust it. Since this adjustment is performed by rotating the head base 3 by a predetermined angle using the mounting screw 9 as a fulcrum, the tape contact surface 1a of the magnetic head 1 after adjustment will be inclined at a certain angle with respect to the tape 5. . Also, this adjustment can only be made in one direction when the disk 2 and head base 3 are parallel and in contact with each other, so make sure to create an angle θ greater than the adjustment angle range between the disk 2 and head base 3 in advance. It is designed to. Therefore, the state of contact between the tape 5 and the magnetic head 1 becomes extremely unstable in the vicinity of the entrance 6 and the exit 7 of the tape 5 described above, resulting in a decrease in the reproduction signal output level. Therefore, conventionally, as shown in FIG. 3, the head base 3 to which the magnetic head 1 is attached is mounted on a jig 10 with a predetermined step so that the head base 3 has almost the same inclination as the state after the disk installation adjustment. The tape contact surface 1a of the magnetic head 1 is set at an angle θ in advance by polishing with a pin tape or the like, and after the disk installation adjustment, the tape contact surface 1a is aligned with the tape 5.
After that, the tape contact surface 1a and the tape 5 were polished so that they were completely parallel to each other. However, this conventional method has the disadvantage that it is not suitable for mass production because it requires a polishing process and jigs used therein to create a predetermined slope on the tape contacting surface of the magnetic head. The present invention has been made in view of the above points, and when cutting a block made by abutting two wafers that have been processed in a prescribed manner and welding them with glass or the like, the surface that will later become the tape contact surface is the cut surface. To provide a method for manufacturing a magnetic head in which the tape is cut so as to be inclined by a predetermined angle θ with respect to a perpendicular surface, the magnetic head is attached to a disk, and the level difference is adjusted, and then the tape and the tape contact surface become almost parallel. It is something. An embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a perspective view of the block, and FIG. 5 is an explanatory diagram of cutting the block. 11 is two wafers 11
A and 11b are machined with a winding groove 11C, a binder filling groove 11d, and a track width defining groove 11e by a well-known method, and after abutting both wafers 11a and 11b and performing glass welding, a groove parallel to the winding groove 11c is formed. Then, cut R so that it is perpendicular to the track width defining groove 11e.
This is a block obtained by applying and polishing. When cutting this block 11 further, as shown in FIG .
Place a stand inclined at an angle θ at the bottom of the tape 1 and cut it vertically as shown in the dotted line to form the tape contact surface 1 as shown in Figure 6.
A magnetic head 12 having an inclination θ at 2a is obtained. The predetermined angle θ approximately corresponds to the inclination angle that occurs between the tape contacting surface of the magnetic head and the tape after a normal magnetic head is attached to the disk and the level difference is adjusted. FIG. 7A shows the state in which the above-mentioned magnetic head is attached to the disk, and the head base 3 with the magnetic head 12 attached to the tip is attached to the disk 2 with screws 9. The contact surface 12 is inclined at an angle θ with respect to the tape 5. Next, step adjustment screw 8 as shown in Figure 7 (b)
When the magnetic head 12 is adjusted to a predetermined position by rotating the head base 3, which acts as a leaf spring, around the screw 9, the tape contact surface 12a and the tape 5 become almost parallel. After this, lightly polish the tape contact surfaces again so that they are completely parallel. In the above embodiment, when cutting the block 11 , the jig placed at the bottom was tilted, but as shown in FIG.
It is also possible to carve it with an inclination of , and then cut it vertically on a horizontal table. As described above, according to the present invention, after the magnetic head is attached to the disk and the level difference is adjusted, the tape is brought into contact with the tape in advance during block cutting so that the tape contact surface of the magnetic head is approximately parallel to the tape. Since the surface is sloped, there is no need to attach each magnetic head to a jig and polish the tape abutting surface, thereby greatly reducing the number of work steps.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the installation of the magnetic head in a VTR, Fig. 2 is a plan view of the tape loaded state of the VTR,
FIG. 3 is an explanatory diagram of conventional head polishing, FIG. 4 is a perspective view of a block, FIG. 5 is an explanatory diagram of the block cutting method of the present invention, FIG. 6 is a side view of a head chip according to the method of the present invention, and FIG. Figures A and B are explanatory diagrams of a state in which a magnetic head according to the method of the present invention is attached to a VTR, respectively, and Fig. 8 is an explanatory diagram of a block cutting method according to another embodiment of the present invention. Explanation of main drawing numbers, 1 , 12 ...Magnetic head, 2...
Disk, 3...Head base, 11 ...Block.

Claims (1)

[Claims] 1 Wafers with winding grooves, bonding material filling grooves, and track width defining grooves are butted together and bonded via a predetermined gear spacer, and then the tape contacting surface is rounded and polished to obtain a block. A method for manufacturing a magnetic head, characterized in that the block is cut so that its cut surface forms an angle of 90°±θ (θ is a number excluding 0) with respect to the tape contact surface.