JPS61110389A - Production for magnetic disc device - Google Patents

Abstract

PURPOSE:To set positional relations between a magnetic gap of a magnetic head and a track of a magnetic disc medium with a very high precision by positioning a guide axis positioning base and a spindle hub accurately through a jig. CONSTITUTION:A spindle hub 10 is fitted to a spindle positioning projecting part 21 of a jig 19 and guide positioning bases 4 are fitted to a positioning base 20 from directions of arrows a3 and a4 to position accurately a spindle motor M and positioning bases 4 of a base 3, and they are clamped and fixed by attaching screws 17 in this state. The base 3 is detached from the jig 19, and a guide shaft 6 piercing positioning bases 4 is placed on and supported by positioning bases 4 and is fixed. Thus, positional relations between the magnetic gap of a magnetic head 2 in the front end of the carriage guided by the guide shaft 6 supported by positioning bases 4 and the track of a magnetic disc medium 7 which is held by the hub 10 and is rotated is held in a very high precision to reduce the azimuth angle.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for assembling a spindle motor and a base in a magnetic disk device, particularly a flexible disk device, used as an external storage device in an information processing system. .

[Conventional technology]

FIG. 3 is a perspective view of a magnetic head drive section in a flexible disk device. 1 is a carriage for moving the magnetic head 2 to a target track on the magnetic disk 7, and the magnetic head 2 is mounted on the tip. A guide shaft 6 is positioned and fixed on an L-shaped positioning base 4.4 provided on the base 3, and a carriage 1 is mounted on this guide shaft 6.
is guided and driven in the radial direction of the magnetic disk medium 7. The opposite side of the carriage l from the guide shaft 6 is guided by a shaft 5 fixed to the base 3 to prevent rotation.

FIG. 4 is a diagram showing the positional relationship between the magnetic disk medium 7 and the magnetic gap of the magnetic head 2, in which the magnetic head 2 is positioned in the direction of arrow a1 on the reference line 9 passing through the rotation center 8 of the magnetic disk medium 7. It is driven back and forth. Therefore, if the magnetic head 2 is sought on a line 9a or 9b that is deviated from the reference line 9, the magnetic gap of the magnetic head 2 cannot be accurately aligned with the target trunk T, and the so-called azimuth angle becomes large. As a result, the output value decreases. Therefore, it is possible to load and read magnetic disk media from different manufacturers.
When writing, problems occur such as not being able to read and write accurately.

[Problem that the invention seeks to solve]

Such a problem occurs because the center of the spindle motor that holds and rotates the magnetic disk medium 7 is shifted to the position shown by lines 9a and 9b with respect to the base 3 on which the magnetic helad 2 is guided. do.

FIG. 5 is a sectional view showing the relationship between the magnetic disk medium 7 and the spindle motor M. A center hole 11 is formed in a spindle hub 10 driven by a spindle motor M, and when a magnetic disk medium 7 is inserted onto the spindle hub 10, a collet 12 passes through an attachment hole 13 of the magnetic disk medium 7. and the center hole 11 of the spindle hub 10.
, and the magnetic disk medium 7 is fixed to the spindle hub 10. At this time, the conical part 14 of the collet 12 fits into the attachment hole 13 of the magnetic disk medium 7, so that the magnetic disk medium 7 is guided by the collet 12, and the center of the magnetic disk medium 7 coincides with the center of the collet 12. .

When the collet 12 is fitted into the center hole 11 of the spindle hub, the centers of the collet 12 and the spindle hub 10 coincide, so that the centers of the magnetic disk medium 7, the spindle hub 10, and the spindle motor M coincide. . Therefore, when attaching the spindle motor M to the base 3, it is necessary to accurately align and attach the spindle motor M to the base.

Therefore, in order to prevent this kind of misalignment of the mounting position, conventionally, the mounting surface was accurately finished, and the positional relationship between the spindle motor and the base was carefully measured using a measuring instrument, and the spindle motor and base were aligned and fixed. ing. However, with this method, measurement errors are unavoidable, and the work is cumbersome and inefficient. Alternatively, the position and diameter of the mounting hole 15 are formed accurately relative to the guide shaft positioning base 4,
It is also possible to position the spindle motor M by press-fitting it into it, but it is difficult to process with high precision, and furthermore, the spindle motor M is once enlarged.
It is difficult to remove the spindle motor M from the base 3, which poses an obstacle when replacing a broken spindle motor M.

A technical object of the present invention is to eliminate such problems in the conventional method of manufacturing a magnetic disk drive, to accurately align the spindle motor and the base with a simple operation, and to produce a magnetic disk drive driven by the spindle motor. The objective is to eliminate misalignment between the tracks of the medium and the magnetic gap of the magnetic head.

[Means for solving problems]

The technical means of the present invention taken to solve this problem is to provide a base on which the spindle motor is mounted with a mounting hole for the spindle motor and a positioning means for a guide shaft that guides a carriage for magnetic/nod movement. A method for manufacturing a magnetic disk drive having a jig, which integrally and accurately includes a positioning means that fits with the guide shaft positioning means of the base and a spindle positioning protrusion that fits into the center hole of the spindle hub. The guide shaft positioning means is fitted with the positioning means of the jig, and the spindle positioning protrusion is fitted into the spindle motor mounting hole of the base, and the spindle is inserted into the spindle motor mounting hole from the outside of the base. A method is adopted in which the spindle motor is fixed to the base with the spindle hub of the motor inserted and fitted with the spindle positioning protrusion.

[Effect]

According to this technical means, since the positional relationship between the spindle positioning convex part in the jig and the guide shaft side positioning means is accurately created in advance, the spindle positioning convex part is attached to the spindle motor of the base. By fitting the guide shaft side positioning means into the hole and the guide shaft positioning means of the base, and fitting the spindle hub of the spindle motor into the spindle positioning convex part, the spindle motor is moved through the jig. The central force of the motor will be accurately aligned with the guide shaft positioning means. Therefore, by fixing the spin F/L/% to the base with the spindle positioning protrusion and the spindle hub fitted together, the spindle motor can be accurately attached to the base at a predetermined position. The positional relationship between the tracks of the magnetic disk medium driven by the spindle motor and the magnetic gap of the magnetic head becomes accurate.

〔Example〕

Next, how the method for manufacturing a magnetic disk device according to the present invention is actually implemented will be explained using examples. FIG. 1 is a perspective view showing a method of manufacturing a magnetic disk device according to the present invention, and FIG. 2 is a sectional view of a jig with a base and a spindle motor mounted thereon. The base 3 is provided with a guide shaft positioning stand 4 for mounting and supporting the guide shaft 6 shown in FIG. 3, and is also provided with a mounting hole 15 into which a spindle motor M is inserted and mounted. 16 is a screw hole for fixing the spindle motor M to the base 3. Turn the base 3 over in the direction of arrow a2, and insert the spindle motor M into the mounting hole 15 from the back side, and the mounting screw 17 passes through the mounting hole 18 of the spindle motor M and is screwed into the screw hole 16 of the base. However, in the inserted state, the spindle motor M is formed to have some play with respect to the base 3.

19 is a jig, which includes a positioning table 20 on the guide shaft side;
Spindle positioning convex portion 21 having the same shape as the collet 12
It is equipped with the following. Arrow a4 of this positioning table 20
The dimensions between the reference plane of the direction and the center of the spindle positioning convex part 21, the surface in the direction of arrows a3 and a4 of the positioning table 20, the outer diameter of the spindle positioning convex part 21, etc.
It is formed in advance with high precision. The base 3 is turned over in the direction of arrow a2 and placed on this jig 19. At this time, the L-shaped guide shaft positioning table 4 of the base 3 is placed on the positioning table 20 and stacked so that the spindle positioning protrusion 21 fits into the spindle motor attachment hole 15 of the base 3. That is, the guide shaft positioning base 4
The horizontal portion 4b is placed on the alignment table 20 from the direction of arrow a3, and the vertical portion 4a is pressed against the side surface of the alignment table 20 from the direction of arrow a4.

Next, insert the spindle hub 10 of the spindle motor M into the mounting hole 15 from above the base 3 which has been stacked upside down.
is inserted. Then, the mounting screws 17 are inserted into the mounting holes 18 of the spindle motor M and temporarily fixed into the screw holes 16 of the base 3. In this state, the spindle hub 10
The central hole 11 and the spindle positioning convex portion 21 are accurately fitted. In this way, the spindle hub 10 is fitted into the spindle positioning convex portion 21 of the jig 19, and the guide shaft positioning table 4 is placed on the positioning table 20 at the arrows a3 and a.
By fitting from four directions, the position between the spindle motor M and the guide shaft positioning base 4 of the base 3 is determined accurately, and in this state, the mounting screws 17 are tightened and fixed.

Next, the base 3 is removed from the jig 19, and the guide shaft 6 inserted into the carriage 1 of FIG. 3 is mounted and supported on the guide shaft positioning table 4 and fixed. As a result, the magnetic gap of the magnetic head 2 at the tip of the carriage l guided by the guide shaft 6 supported by the guide shaft positioning base 4 and the track T of the magnetic disk medium 7 held and rotated by the spindle hub 10 are adjusted. The so-called azimuth angle can be made small by maintaining an extremely high mutual positional relationship.

〔Effect of the invention〕

As described above, according to the present invention, the guide shaft positioning table and the spindle hub, which influence the position of the magnetic head,
Since positioning can be performed accurately using a jig, the positional relationship between the magnetic gap of the magnetic head and the trunk of the magnetic disk medium can be set with extremely high precision. Moreover, it can be assembled quickly and easily using a jig, resulting in extremely high production efficiency.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a method for manufacturing a magnetic disk device according to the present invention, FIG. 2 is a sectional view of a base and spindle motor mounted on a jig, and FIG. 3 is a magnetic head drive in a known magnetic disk device. FIG. 4 is a diagram showing the positional relationship between the magnetic disk medium and the magnetic gap of the magnetic head, and FIG. 5 is a cross-sectional view showing the relationship between the magnetic disk medium and the spindle motor. In the figure, 1 is a carriage, 2 is a magnetic head, 3 is a base, 4 is a guide shaft positioning base, 7 is a magnetic disk medium, 10 is a spindle hub, 11 is a center hole, 15 is a motor mounting hole, 19 is a jig, Reference numeral 20 indicates a positioning table on the guide shaft side, and reference numeral 21 indicates a spindle positioning convex portion. Patent applicant: Fujitsu Ltd. Agent: Minoru Aoyagi, Figure 2, Figure 3

Claims (1)

[Claims] A method for manufacturing a magnetic disk drive having a spindle motor mounting hole in a base on which a spindle motor is mounted and a means for positioning a guide shaft for guiding a carriage for moving a magnetic head, the method comprising: a jig having a guide for the base; A positioning means that fits with the shaft positioning means and a spindle positioning convex portion that fits into the center hole of the spindle hub are integrally and accurately provided, and the guide shaft positioning means is fitted with the positioning means of the jig. At the same time, the spindle positioning protrusion is fitted into the spindle motor mounting hole of the base, and the spindle hub of the spindle motor is inserted into the spindle motor mounting hole from the outside of the base, and it is fitted with the spindle positioning protrusion. A method of manufacturing a magnetic disk device, characterized in that a spindle motor is fixed to a base.