JPS6182390A - Assembling method of magnetic head unit - Google Patents

Abstract

PURPOSE:To set respective dimensions and angles easily with a simple composition and to fix a magnetic head arm and a gimbal by using a jig equipped with four necessary reference surfaces. CONSTITUTION:Against reference surfaces A and B of a striking rib 16 of a jig 15, the fitting part to a supporting body of a head arm 1 is struck. Next, a gimbal 2 in which a magnetic head H is fitted, is struck against the left of a reference surface D of a striking rib 17, the gimbal 2 is fixed to the arm 1 with a screw 12, and then, without measuring the dimensions, angles, etc., using a microscope, etc., respective dimensions and angles are easily set with a simple operation, and the magnetic head arm and a gimbal can be precisely fixed.

Description

Detailed Description of the Invention [Industrial Application Field] In a magnetic disk device used as an external storage device of an information processing device, the recording/reproducing gap of a magnetic head that records/reproduces information on a magnetic recording medium is In order to be able to accurately seek to a predetermined trunk on a recording medium, it is necessary to set the dimensions between the write/read gap of the magnetic head and the drive section of the magnetic head with high precision. To do this, the magnetic head drive unit must record/write the magnetic head.
It is necessary to connect each component with high dimensional accuracy up to the reproduction gap. The present invention relates to a method of completing a magnetic hand unit by assembling a plurality of parts with high precision in this manner.

[Conventional technology]

Figure 4 (a) is a plan view of the magnetic head drive device in which the magnetic head unit is mounted, and (b) is a cross-sectional view of figure (a).
FIG. Reference numeral 1 denotes a magnetic head arm, at the tip of which a magnetic head H is attached and supported via a gimbal 2. This magnetic head arm 1 is fixed to an arm support 4 fixed to a drive shaft 3. For this fixation,
A reference plane A in the tangential direction of the drive shaft 3, a reference plane B in a direction perpendicular to the reference plane A, and a reference plane C defining the vertical position of the magnetic head arm 1 are provided. Further, a rectangular mounting hole 5 is formed in the magnetic head arm 1 between the reference planes A and B, and a fixed head 6a at the tip of the fixed arm 6 is fitted into the hole 5. A threaded rod 6c integral with the fixed arm 6 passes through a hole 4a in the arm support 4, and a nut 7 is screwed thereto.

The threaded rod 6c forms an angle of 45 degrees with the reference planes A and B, and the side 5a of the mounting hole 5, which is perpendicular to the threaded rod 6c, is inclined at 45 degrees. Therefore, when the fixed head 6a is fitted into the hole 5 and the nut 7 is tightened, the inclined surface 6b of the fixed head 6a presses against the inclined surface 5a of the mounting hole 5, and the magnetic head arm 1 moves from the reference surface A. , , is pressed in the B and C directions. That is, by simply tightening one fixing arm 6, positioning and fixing in three directions can be achieved. With the magnetic head arm 1 fixed to the arm support 4 in this manner, the magnetic disk 8 is rotated in the direction of the arrow a1, and
By rotating the magnetic head arm 1 with the drive shaft 3, the magnetic head H seeks to a predetermined track.

In order to enable the magnetic head to accurately seek to a target track in this manner, dimensional accuracy between the magnetic head H and the drive shaft 3 is essential. For this purpose, as mentioned above, there are three reference planes A,
Positioning accuracy between B and C is ensured. For the same reason, when fixing the magnetic head arm 1 and gimbal 2, it is necessary to set the dimension between the gap G of the magnetic head H fixed to the gimbal 2 and the reference planes A and B with high precision. be.

That is, as shown in FIG. 3, the reference plane A in the tangential direction of the drive shaft 3 and the gear knob G of the magnetic head are parallel to each other, but firstly, the extension line to this reference plane and the gap The shortest distance X between G and the extension line is set to a prespecified dimension. Second, the distance Y between the center line 9 of the gap G in the direction parallel to the reference plane B and the reference plane B is set to a predetermined dimension. Third, the angle θ formed by the line 11 perpendicular to the gap G (direction of the rail 10 of the magnetic head) and the reference plane B.
is set to a prespecified angle.

With each dimension and angle set with high precision in this way, the screws 12 and 12 are tightened and fixed.

[Problem that the invention seeks to solve]

However, conventionally, each distance X, Y and angle θ are
The setting was carried out while making measurements using the factory R1a mirror. Therefore, not only is the work troublesome, but also 1
If one distance is set, the other distance will be incorrect, making it difficult, time consuming, and inefficient to obtain the specified dimensions.

In addition, thin lines are drawn on the glass plate according to the dimensions X, Y and angle θ from the reference planes A, B to indicate the gap position, and this glass plate is stacked on the magnetic head H, and the gap G and the rail 10 are marked on the thin lines. There is also a way to combine. However, placing glass on the magnetic head in this manner requires extreme care because there is a risk of damaging the core 13 of the magnetic head.

The technical problem of the present invention is to solve these problems in the conventional method of assembling a magnetic head arm and make it possible to easily set each dimension and angle and fix the magnetic head arm and gimbal with simple operations. There is a particular thing.

[Means for solving problems]

The technical means of the present invention taken to solve this problem consists of a reference plane A in the tangential direction of the drive shaft for seeking the magnetic head to the desired trunk of the magnetic recording medium, and a reference plane perpendicular to the reference plane A. A magnetic head unit, in which a magnetic head is mounted on the tip of a magnetic head arm via a gimbal, is fixed to a drive shaft by a reference plane B in the direction and a reference plane C that defines the vertical position of the magnetic head arm. In a magnetic head drive 6 movement device in which positioning is performed with an arm support, a reference plane A in the tangential direction of the drive shaft in the arm support and a reference plane B in a direction perpendicular to the reference plane A correspond to a reference plane B. and a reference surface of at least f & end of the gimbal,
Form the positioning jig with high accuracy in advance, and position the magnetic head arm's reference planes A and B so that they match the corresponding reference planes A and B of the jig, and the rear end side of the gimbal aligns with the jig's reference plane. A method is adopted in which the magnetic head arm and gimbal are fixed in a state in which they are aligned and positioned.

〔Example〕

Next, how the method for assembling the magnetic hand unit according to the present invention is actually implemented will be explained using examples.

FIG. 1 is a plan view showing a first embodiment of the method for assembling a magnetic hemisphere according to the present invention, and the same parts as those in FIG. 3 are given the same symbols -. That is, 2
is a gimbal, and a magnetic head H is attached to the tip. Reference numeral 1 denotes a magnetic head arm, on which the two reference planes A and B described above are formed in advance. Further, a guide hole 14 for fixing the gimbal 2 is formed at the tip along with the gimbal 2. A set screw 12 is loosely screwed into both the gimbal 2 and the magnetic head arm 1.

15 is a base of a jig, and on this base 15 the magnetic head arm 1 and gimbal 2 are aligned and fixed. Reference numeral 16 denotes a positioning abutment rib provided on this base 15, which positions the reference surface A for positioning the magnetic head arm 1 to the reference surface and the reference surface B of the magnetic head arm 1. Reference planes B are provided corresponding to the 2i & quasi-planes A and B of the arm support 4 in FIG. 4, respectively.

There is another abutting rib 1 on the tip side of the magnetic head arm.
7 is provided. This abutment rib 17 has a reference surface formed thereon against which the rear end 2a of the gimbal 2 abuts. Further, a reference plane E is formed for abutting the side end 2b of the gimbal 2.

In the illustrated embodiment, since the rear end 2a and side end 2b of the gimbal are at right angles, the reference surface E of the abutment rib 17 of the jig is also at right angles. In addition, the reference plane E is the gimbal rear end 2a when the magnetic heel gap G is placed at a pre-designed regular position, that is, at a regular distance X, Y and angle θ, as shown in FIG. and is arranged at a position corresponding to the side end 2h.

Note that the gimbal 2 itself is made of an extremely thin leaf spring, so it is attached to the magnetic head arm 1 by welding it to a thick plate called a spacer, and attaching it to the magnetic head arm together with the spacer. . Therefore, the "rear end 2aJ" and "side end 2bJ" of the gimbal include the rear end and side end of the spacer.

First, the magnetic head arm 1 is set in the jig 15 in which the abutting ribs 16 and 17 are provided with high precision in advance. At this time, when attaching the magnetic head arm 1 to the arm support 4, the reference surface A of the abutting rib 16,
Hit B. Next, the gimbal 2 to which the magnetic head H is attached is set on the rib 17 with abutment -9=. At this time, the rear end 2a of the gimbal 2 is abutted against the reference surface of the abutting rib 17, and the side end 2a
b against the reference surface E. With the magnetic head arm 1 and gimbal 2 abutting against the abutment ribs 16.17 in this manner, the setscrews 12.12 are screwed together to fix the tightening. By removing it from the jig 15 in the fixed state,
The magnetic head unit consisting of the gimbal 2 and the magnetic head arm 1 is completed.

The abutment rib 17 is arranged at a higher position than the magnetic head arm 1 so that the reference surface E of the abutment rib 17 does not abut the magnetic head arm 1 but only the spacer or gimbal 2.

In the jig 15, a guide pin is installed in advance at the position of the guide hole 14 of the gimbal 2.
The guide pin may be fitted into the hole.

Note that the set screw 12 is loosely screwed onto the gimbal 2 and the magnetic head arm 1 in advance, and the magnetic head arm 1 and gimbal 2 are set together on the jig 15, and after setting each reference plane. and set screw 12.12
It is better to only need to tighten the parts.

FIG. 2 is a plan view and an enlarged sectional view of essential parts showing another embodiment of the present invention. FIG. 1 shows an example in which the present invention is applied to a gimbal called the Watrous type, and FIG. 2 shows an example in which the present invention is applied to a gimbal called the Winchester type. The Watrous type gimbal has a structure in which it is fixed with two setscrews 12 and 12 after determining the position in the X and Y directions. On the other hand, in the Winchester type, as shown in FIG. 2(B), an eyelet-shaped shaft 18a for fixing is provided in advance on the spacer 18 to which the gimbal 2 is fixed, and this eyelet-shaped shaft 18a is attached to the magnetic head arm. 1 is installed by inserting it into the hole 1a and tightening it from the inside. Therefore, to attach the eyelet shaft 18a to the magnetic head arm 1, simply inserting it into the hole 1a determines the position of the magnetic head arm 1 and gimbal 2. By simply determining the position, the dimensions X, Y and angle θ from the reference planes A and B shown in FIG. 3 are set.

Therefore, in the jig 15, the abutting ribs 16 on the reference surfaces A and B at the joint part with the arm support 4 are the same as in the example shown in FIG. Only 20 are provided. That is, the abutment member 20 is disposed at a position corresponding to the position of the gimbal rear end 2a when the gap G of the magnetic head forms a regular angle θ with respect to the reference plane B. This abutting member 20
may be fixed to the jig 15, but as shown in the example, guides 21 and 22 may be provided on both the left and right sides, and the abutment member 20 may be structured to slide back and forth between the guides 21 and 22. , and the spring 23 pushes the abutting member 23 onto the gimbal rear end 2a.
It is also possible to have a structure in which it is pressed against. At this time, as shown in Figure (B), the abutment member 20 is placed at a higher position than the magnetic head arm 1 so that the reference surface does not hit the magnetic head arm l, but only the spacer 18. be done.

The assembly operation of magnetic head arm 1 and gimbal 2 is as follows:
To install the magnetic head arm 1, the eyelet-like shaft 18a of the spacer 18 is inserted into the hole 1a, and as in the case of FIG. Strike. Next, at the rear end of the spacer 18,
After the abutment member 20 is pressed to determine the rotational position of the gimbal 2, the eyelet shaft 18a is crimped and fixed to the magnetic head arm 1.

〔Effect of the invention〕

As described above, according to the present invention, by simply abutting each of the magnetic head arm and the gimbal against the reference surface of the respective positioning abutting ribs, the gap between the magnetic head arm and the magnetic head supported by the gimbal is reduced. positioning can be performed accurately and easily.

Moreover, there is no fear of damaging the magnetic head.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the method for assembling a magnetic head unit according to the present invention, FIG. 2(A) is a plan view showing another embodiment of the present invention, and FIG. FIG. 3 is a plan view showing a conventional method of assembling a magnetic head unit, and FIG. 4 is a plan view and a sectional view of a main part of a magnetic head unit. In the figure, ■ is a magnetic head arm, 2 is a gimbal, and H
is a magnetic head, G is a gap, 12 is a set screw, 15 is a jig, 16.17 is a butting rib, 18 is a spacer, 1
8a is an eyelet shaft, 20 is an abutment member, and A...E are reference surfaces, respectively.

Claims (1)

[Claims] A reference plane A in a tangential direction of a drive shaft for seeking a magnetic head to a target track of a magnetic recording medium, a reference plane B in a direction perpendicular to the reference plane A, and upper and lower surfaces of a magnetic head arm. A magnetic head in which the position of a magnetic head unit, in which the magnetic head is mounted on the tip of a magnetic head arm via a gimbal, and an arm support fixed to a drive shaft is determined by a reference surface C that defines the position in the direction. In the drive device, a reference plane A in the tangential direction of the drive shaft in the arm support, a reference plane corresponding to a reference plane B in a direction perpendicular to the reference plane A, and a reference plane D at least on the rear end side of the gimbal. of,
Form the positioning jig with high accuracy in advance, and position the magnetic head arm's reference planes A and B by matching them with the corresponding reference planes A and B of the jig, and position the gimbal's rear end side by aligning it with the jig's reference plane D. A method for assembling a magnetic head unit characterized by fixing a magnetic head arm and a gimbal in a state where they are aligned and positioned.