JPH03238603A - Magnetic head, its manufacture and jig for manufacturing same - Google Patents

Abstract

PURPOSE:To precisely fit a head chip at a prescribed position, and simultaneously, to prevent the shortening of life due to unsymmetric wear by making plural sets of gap forming bars into chips by cutting them into prescribed size after fixing them firmly on outer circumferential surfaces parallel with a gap surface and adjoining to each other. CONSTITUTION:Plural pieces of the gap forming bars 2a to 2d are connected to each other as forming steps in the direction of gap depth 11, and an obtained bar is cut in the direction of the thickness of the chip of a magnetic head, and is made into the chips constructed so that a reinforcement part 14 is provided so as to make the chip thicker than prescribed chip thickness in order to prevent a recording medium from coming into contact. After that, a sliding surface is finished into circular arc form so that the adjoining gap depth 11 of the magnetic head increases gradually from a normal value. Thus, since plural pieces of the head chips can be arranged highly precisely at the prescribed position, and the peeling-off of the head chip due to the cutting of the gap forming bars is removed, and a strong integrated magnetic head is formed, the damage of the head can be prevented at the time of installing it on a head base, and working time for assembling can be greatly shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic head particularly suitable for high signal rate recording/reproduction, a manufacturing method thereof, and a manufacturing jig therefor.

BACKGROUND OF THE INVENTION As is well known, in a magnetic recording device such as a conventional VTR, a plurality of magnetic heads are disposed on a rotating substrate in order to cope with the expansion of frequency bands.

The tracks of these multiple magnetic heads must be arranged so that the heights from the substrate reference plane to the track portions are staggered so that the track passing trajectories on the recording medium (magnetic tape) do not overlap. .

If there are a large number of magnetic heads to be installed, from the viewpoint of workability etc., it is recommended to arrange a plurality of heads adjacently on one pace board, and then arrange this base board on a rotating board. A configuration will be adopted. This is because it is more convenient to adjust the track position between adjacent heads on a single board than to adjust the position between tracks of heads distributed around the circumference. The head configuration is as follows: The gear forming bar or plate is cut so that the track tracks do not overlap, and the Rad tip is individually attached to each cut so that the track tracks do not overlap.
When the head sliding surface is formed into a predetermined shape, the head is positioned so that the gap depth is uniform, and the head chips are placed in close contact with each other so that they do not face each other from the width direction of the head chip. The problem to be solved by the present invention was to polish the head sliding surfaces, which were attached to the head base in a state where the head was mounted on the head base, or to make the gap depth uniform, by front polishing the sliding surfaces of the heads, which were arranged in plural numbers on the head base. Cut the head chip to a size that will prevent the tracks from overlapping from the gear forming bar.
The above configuration was achieved by attaching a plurality of head chips obtained in this way to the head base individually.However, in such conventional technology, the high processing required for cutting the helad chip from the gear tooth forming bar was difficult. It was difficult to fully satisfy the accuracy.Furthermore, when fixing the head chips on the base with adhesive, etc., each head chip may be tilted, and the track trajectories may overlap or be too far apart due to uneven thickness of the adhesive layer, etc. How to install the head tip Due to the height, it is difficult to ensure the accuracy of the gap depth and gap spacing.In addition, when making these adjustments, the head tip often gets damaged. It took a long time to complete the work, and the sliding surface of the head and the recording medium such as magnetic tape had to travel while sliding relative to each other. Because the states are different, either −
Since the auspicious case has a larger amount of wear than the other (hereinafter referred to as unilateral wear), the gap depth of the head with the large amount of wear is greatly reduced, shortening the life of the head. The purpose of the present invention is to solve the problems of the prior art.A Means for Solving the ProblemsTo solve the above problems, the present invention provides a method in which a plurality of gear tooth forming bars are provided with steps in the gap depth direction. The bars thus obtained are bonded to each other and cut into chips with a reinforcement section so that the recording medium does not come into contact with the magnetic head in the chip thickness direction and is larger than a predetermined chip thickness. The sliding surface is machined into an arc shape so that the gap depth gradually increases from the normal value.It also works by machining the sliding surface into an arc shape so that the gap depth gradually increases from the normal value. By cutting and making chips with a structure equipped with reinforcing parts, multiple Herad chips can be attached to predetermined positions with high precision, and an integrated magnetic head can be formed without the head chips peeling off due to cutting. Also, there is no time for the recording medium to run on the head sliding surface.
By polishing the front surface of the gap depth in the area where the head sliding surface curves to one side, and gradually increasing the gap depth from the normal value so that it becomes larger in advance, it is possible to solve the conventional shortened life due to one-sided gap depth. An embodiment of the present invention will be described below with reference to the drawings. Step-like steps on the base 4 (appropriate several tens of microns)
When placing the gear tooth forming bars 2a, 2b, 2c, and 2d on the magnetic head manufacturing jig 1 equipped with a magnetic head manufacturing jig 1, each gear tooth forming bar is moved in the direction of arrow A so that the tracks 9 do not overlap. Each base part 12 is regulated in a predetermined position and adjacent to each other with a certain gap by a bonding agent 3 made of a sputtered film of low-melting point glass or an adhesive such as epoxy. A gap forming bar is held between the side plate 5 and the side plate 5, and is pressed in the direction of arrow B by the pressure screw 8 via the pressure plate 6 and the plate spring 7.
Figure 2 is a perspective view showing the integrated gap-forming bar cut into a structure with an integral reinforcing part.This reinforcing part increases the adhesive strength between adjacent chips. It is possible to construct such a reinforcing section as follows: First, step grooves 13 are formed in the gap forming bars fixed to each other. Next, step grooves 13 are formed. A cutting groove 15a is cut on the opposite side of the chip so that it has a predetermined chip thickness.
Even if a magnetic head with a structure including an integrated reinforcing part 14 is formed by inserting the cut groove 15b, the reinforcing part 14 will not come into contact with the recording medium (1 length). The reinforcing method shown in Fig. 3 is shown in Fig. 3. The bonded head chip shown in Fig. 2 is fixed to the head base 21, and the front surface of the head chip (the surface that slides on the recording medium) is formed into a smooth arc shape. This is an enlarged view showing the state after polishing.
This polishing process is performed by rubbing the entire surface of the head chip against the wrapping tape while rotating the base 21. As shown in the figure, the gap depth is almost the normal value on the exit side of the recording medium, and then transferred to the recording medium. The head tip near the population side is made to gradually increase from the normal value.
How far should a pair of gap forming bars be shifted from each other in the gap depth direction (by creating a step) when joining them?
By experimentally determining in advance whether the desired gap depth difference is formed according to the above relationship after polishing the front surface, it is possible to easily avoid problems with a head configured in this way. On the side (
It is possible to solve the conventional problem of creating an allowance in the gap depth by the above-mentioned front processing. According to the present invention, as described in detail of the invention, it is possible to install the head chip with the center of the width direction of the head chip offset from the center of the head base 21, and to set the gap depth relationship as described above. The head chip can be placed in a predetermined position with high precision, and a strong integrated magnetic head is formed without the head chip peeling off due to the cutting of the gap forming bar. Damage can be prevented and assembly time can be significantly shortened.By providing a step-like step on the base of the magnetic head manufacturing jig and gradually increasing the gap depth from the standard value, each gap forming bar is (Since processing can be performed with the same dimensions, stable accuracy can be obtained.
At the same time as the shape becomes stable, the gap depth becomes uniform across multiple heads to a normal value, extending the life of the head.

[Brief explanation of drawings]

Fig. 1 (friend) Description of a magnetic head manufacturing jig and manufacturing method in one embodiment of the present invention @ Fig. 2 1 Appearance of a magnetic herad chip with a reinforcing portion in the embodiment @ Fig. 3 (
This is an enlarged view of the Radchip to an example in which the gap depth gradually increases from the regular bond...Magnetic head manufacturing process 7
4. 2a, 2b, 2c, 2d... Gap forming bar 3... Hard M 4... Base part 11...
Gap fat included 13...stage machining ill 14...
・Reinforcement parts 15a, 15b...cutting

Claims (1)

[Claims] (1) A magnetic method characterized in that a plurality of sets of gap-forming bars are fixed at their outer peripheral surfaces parallel to the gap plane and adjacent to each other, and then cut into predetermined dimensions to form chips. Head manufacturing method. (2) The magnetic head according to claim 1, characterized in that the structure includes a reinforcing portion having a thickness greater than a predetermined chip thickness and which does not come into contact with the recording medium in the chip thickness direction of the magnetic head. (3) The magnetic head according to claim 1 or 2, wherein the magnetic head has a structure in which the gap depth of adjacent magnetic heads gradually increases from a normal value. (4) a base section that holds the gap forming bars on its side surface; a bar mounting section that places the plurality of gap forming bars;
1. A magnetic head manufacturing jig comprising a pressing part that presses the gap forming bar, wherein the bar mounting part is provided with a step-like step.