JPH0411364A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To accurately record and reproduce a signal with a magnetic head by forming arms into plates and providing the laminated face orthogonally to a magnetic disk. CONSTITUTION:Laminated and fixed plate-shaped arms 81a to 81f are fixed to an arm contact part 51a in the front end part of a supporting arm 51. The laminated face of the arm 5 is orthogonal to the face of the magnetic disk and the seek direction of a magnetic head 11. Consequently, surface deviation is generated only in the direction perpendicular to the face of the magnetic disk in the position of the magnetic head 11 though surface deviation is generated in plate-shaped arms 81a to 81f with the part of a screw 12 as the center, and the positional deviation to tracks on the magnetic disk scarecely occurs. Thus, a signal is accurately recorded and reproduced by the magnetic head 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of an actuator arm used in a fixed magnetic disk drive.

[Conventional technology]

FIG. 8 is a partial perspective view showing a conventional magnetic disk device disclosed in, for example, Japanese Unexamined Patent Publication No. 60-79574. A so-called housing is constructed by these, and a rotating shaft 4 is inserted between the upper support plate 2 and the lower support plate 3 via a bearing (not shown). A support arm 5 that rotates in unison with the support arm 5 is fixed thereto, and a drive coil 6 is attached to the rear of the support arm 5. A magnetic circuit 7 is provided between the above-mentioned upper support plate 2 and lower support plate 3 in a non-contact manner so as to surround the drive coil 6 from above and below.

In addition, the support arm 5 has a number of arms 8 stacked on the support arm 5. These arms 8 are crimped and fixed to the support arm 8 with bolts 9, and a positioning pin 10 is mounted on the stacked arm. 8 and is driven into receiver s5a. and,
A magnetic hand U is fixed to the tip of each arm 5.

Next, the operation will be explained. A magnetic disk (not shown) faces each magnetic head H, positioning information recorded on the magnetic disk is reproduced by the magnetic head H, and a positioning current flows into the drive coil 6 in accordance with this reproduced signal. do. As a result, the support arm 5 and the arm 8 rotate about the rotating shaft 4, and the magnetic hand (2) is positioned at a predetermined trunk on the arsenic disk. Through the above operations, in the fixed disk device, computer signals are reproduced and recorded between the magnetic head (2) and the magnetic disk. There is no problem with these operations at room temperature, but the support arm 5,
Since the materials of the arms 8 and bolts 9 have different coefficients of linear expansion, repeated loads at low or high temperatures will cause surface misalignment in the laminated surfaces between the arms, and misalignment between the magnetic heads 11 as well. . Therefore, a problem arises in that signals recorded on the magnetic disk cannot be correctly reproduced. To deal with this, measures are taken to prevent positional deviation, for example by driving a positioning pin io. However, as will be described later, it is impossible to prevent the above-mentioned surface deviation by using the positioning bin 1O.

[Problem to be solved by the invention]

The conventional magnetic disk drive is constructed as described above, but due to the expansion and contraction between the members due to temperature changes, especially between the bolt 9 and the arm 8 under high temperature conditions, the bolt 9 is made of stainless steel (il expansion coefficient: 16XlO-' )・Arm 8
If it is aluminum (linear expansion coefficient: 213X10-"), the bolt 9 tends to loosen,
Conversely, the bolts 9 tend to be tightened under low temperature conditions. For this reason, plane misalignment occurs on the laminated surfaces around the axis of rotation, and when repeated low and high temperatures are applied, this misalignment gradually increases. If a relative positional shift occurs between the arms 8, the position of the magnetic head H relative to the trunk on the disk will shift, resulting in mold that prevents accurate signal recording and reproduction, which is a function of the magnetic disk device. .

This invention was made to solve the above-mentioned problems.Despite the arm having a laminated structure, the magnetic head is positioned with high precision, and information recorded on the magnetic disk can be accurately reproduced. The purpose is to obtain equipment.

[Means to solve the problem]

In the magnetic disk device according to the present invention, the laminated surface of the arm is perpendicular to the surface of the magnetic disk and the seek direction of the magnetic head.
It is something that

[Effect]

In the magnetic disk device according to the present invention, even if some misalignment occurs in the laminated surfaces of the arms, no difference occurs in the relative positions between the magnetic heads, and computer information can be accurately recorded and reproduced on the magnetic disk.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. In addition, in the drawings, the explanation will focus on the support arm, which is different from the conventional structure. FIGS. 1 to 8 show an embodiment of the present invention, in which a support arm 51a&'L is integrated with the support arm 51 and has the same role as the support arm 5 of the conventional device. The arm abutting portions 81a to 8]f provided in the light leakage portion are plate-like arms laminated and fixed to the arm abutment portions;
A screw hole for a screw ν is provided in the arm contact portion 51a for fixing the arm contact portion 81f to the arm contact portion solder.

In the magnetic disk device according to the present invention configured as described above, the basic operation of recording and reproducing signals on the magnetic disk is exactly the same as that of the conventional Ilf device.

However, as will be described below, there are large differences in the positional deviation of the magnetic head U with respect to temperature changes and usage conditions of the apparatus.

That is, in the device having the conventional structure, as described above, in the stacked arms 8, the stacked surfaces of the arms 8 are misaligned around the bolts 9, making it impossible to record and reproduce signals accurately. On the other hand, in the magnetic disk device according to the present invention, since the laminated surface is perpendicular to the surface of the magnetic disk, even if the screw screw ν
Even if a plane misalignment occurs in the plate-like arms 81a to 81f centering on the magnetic head U, the plane misalignment will only occur in the direction perpendicular to the surface of the magnetic disk at the position of the magnetic head U, and there will be almost no misalignment with respect to the trunk on the magnetic disk. do not have. Therefore, recording and reproduction of signals by the magnetic head H can be performed accurately.

Incidentally, as a secondary effect, since the gap between the plate-like arms 81 is large, the load around the rotating shaft 4 is reduced and the operation of the actuator is increased.

Next, other embodiments of the invention will be described.

In the structure shown in FIG. 4, a spacer is provided between each plate-like arm 81, and a vertical screw 14 is passed through the spacer so that the arm abuts s51! A screw hole is provided at L. In order to maintain the parallelism of each plate-shaped arm 81, the contact surfaces of the spacer are machined with high precision, and the assembly procedure is to first tighten the vertical screw 14N and then tighten the screw ν. In the device configured in this manner, not only the parallelism between the plate arms 81 is maintained, but also the attributes of the plate arms 81 are improved, and the impact resistance of the device is increased.

Next, still another embodiment will be described with reference to FIG. In the previous example, the screw screw ν was provided only at the bottom end, but five arm contact parts were provided at the bottom end and the middle part, and the screw screw ν was provided in two stages to correspond to this. The plate-like arms 81 may be stacked.

According to this, the assembly rigidity is higher than that of the device having the structure shown in FIGS. 1 to 8, and the impact resistance of the device is increased as described above. Needless to say, the same effect can be obtained even if the number of arm contacts 551m is further increased.

However, if it increases more than necessary, (b) the load around the rotating shaft 4 will increase and the high-speed performance of the actuator will be impaired, so care must be taken.

Next, further embodiments will be described with reference to FIG. 6 &:. In the Wt configuration shown in the figure, an arm abutment s51& is provided at the extension S of the support arm 51. In this case, the structure becomes open and costs can be reduced.

Next, still another embodiment will be described with reference to FIG. In the figure, an arm abutment 551a is provided at the center, and a screw hole for a screw ν is provided in the arm abutment s51& and the plate-like arm 8 to form a laminated arm for swinging. According to this, since the arm abutting portion 551m does not protrude from the lower turtle, the vertical dimension of the rotating portion can be reduced, and the vertical dimension becomes nearly symmetrical about the arm abutting portion 51a. In addition, the arm abutting part is connected between the plate-like arm 81hJ31c and 81υ1.
If two parts are provided between e and each part is tightened with screws ν, the upper and lower parts will be more symmetrical.

Note that when the top and bottom are symmetrical, there is no time difference in the positioning of each magnetic head when the arm seeks, and the target signal can be recorded and reproduced accurately.

In the above description of each structure, the manufacturing method of the plate-shaped arm 81 was not specified in particular, but the plate-shaped arm may be obtained by punching and bending from a large plate material, or the plate-shaped arm may be obtained by die-casting. You can also get

〔Effect of the invention〕

As described above, according to the present invention, since the arm is made into a plate shape and the laminated surface is provided on a surface perpendicular to the magnetic disk, surface misalignment can be prevented and signals can be accurately recorded and reproduced by the magnetic head. be.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view of a magnetic disk device according to an embodiment of the present invention, FIG. 2 is a partial front view of the magnetic disk device seen from the disk side, and FIG. 8 is a side rBJ view of FIG. 4 is a partial front view showing another embodiment of the invention, FIG. 6 is a perspective view showing still another embodiment, FIG. 6 is a partial front view showing still another embodiment, and FIG. 7 is a partial front view showing still another embodiment. 8 is a perspective view showing still another embodiment, and FIG. 8 is a perspective view showing a positioning mechanism of a conventional magnetic disk device. In the figure, ■ is a magnetic head, branches are screws, ribs are spacers,
14 is a vertical thread, 51 is a support arm, 51& is an arm abutting portion, and 81, 81JL to 81f are plate arms. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] In a magnetic disk drive in which a positioning mechanism is constructed by stacking arms, a bent part is provided in the plate-shaped arm so that the surface of the arm on which the magnetic head is attached is parallel to the magnetic disk, and the stacked surface of the plate-shaped arm is parallel to the magnetic disk. A magnetic disk device characterized in that the configuration is orthogonal.