JPH036592B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an actuator structure that prevents deformation due to temperature at the joint between a magnetic circuit constituting an actuator of a magnetic disk device and a housing of a carriage holding section. .

Magnetic disk drives are used in information processing systems as peripheral devices for computers and other devices. They hold a magnetic head with a small gap between them on a disk disk that rotates at high speed, and drive a large number of concentric tracks on the disk disk. It is a device for recording information on disks, and generally multiple disks are stacked to increase the recording capacity.

The gap between the magnetic head and the disk disk is extremely narrow due to magnetic characteristics, and is sealed to prevent dust from entering and damaging the magnetic head and disk disk surface. Therefore, due to the internal strain of each structural member caused by internal temperature changes, the positioning of the magnetic head to the target track by the servo head tends to deviate, resulting in off-track.

In addition, since the rotary arm moves the magnetic head to the outer periphery of the disk disk by the singing motion of the arm, the length of the arm increases and the resonance frequency of the actuator decreases, so an actuator structure that increases the resonance frequency of the actuator is desired. .

[Conventional technology]

Conventionally, the magnetic circuit (including the yoke on the outer periphery of the magnetic circuit) constituting an actuator (particularly a swing arm type) is connected to the housing of the carriage holding part by holding an arm 2 having a magnetic head 1 as shown in FIG. The side surface of the magnetic circuit 4 is brought into close contact with the side surface of the housing 3 (contact surface A), and the holding plate 5 is fixed with screws 6, or a magnetic head (the magnetic head is omitted in the figure) is provided as shown in FIG. In this method, the housing 7 holding the arm 2 and the magnetic circuit 8 are completely separated and held separately on the base 9, and the contact surface of the magnetic circuit at this time is B.
Note that 10 indicates a screw for fixing the magnetic circuit 8 to the base 9, 11 indicates a disk disk facing the magnetic head 1, and 12 indicates a swing shaft for rotating the arm 2.

[Problem that the invention seeks to solve]

In the above-mentioned conventional method of connecting the magnetic circuit and the housing, the housing 3 is made of aluminum and the magnetic circuit 4 is made of iron, which have different coefficients of linear expansion.The difference causes temperature stress, which causes the housing 3 to change and The magnetic head 1 on the arm 2 held at 3 causes off-track.

In addition, the latter method of coupling has the problem that by holding them separately on the base 9, the rigidity is reduced and the resonance frequency is lowered, making it easier for the servo positioning system to oscillate, resulting in instability in the servo loop. There is.

[Means for solving problems]

The above problem is that the housing of the carriage holder, which is formed by fixing an arm having a magnetic head disposed opposite to a disk to a swing shaft, and the connecting part between the magnetic circuit that swings the swing shaft are fixed at one end. This problem is solved by the archuator structure of the present invention, in which the other end is brought into contact with the housing/magnetic circuit via rollers so as not to cause deformation of the housing/magnetic circuit due to temperature.

[Effect]

In other words, by fixing the coupling part between the housing of the carriage holder and the magnetic circuit that swings the swing shaft at one end, and fixing the other end in contact with a gap provided through a roller, vertical changes in the housing due to temperature changes can be prevented. Since it slides on a roller with little friction, there is almost no stress. In addition, the lower end of the housing has a fixed contact surface with the magnetic circuit, and the upper end is in contact with the magnetic circuit in the longitudinal direction of the roller, so it is rigid and does not lower the resonance frequency.

〔Example〕

Hereinafter, the gist of the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a perspective view illustrating an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures.

In the figure, a housing 13 of a carriage holder that fixes an arm 2 having a magnetic head 1 disposed opposite a disk 11 to a singing shaft 12 and a magnetic circuit 14 that swings a swing shaft 12 are shown. One end (lower contact part C) of the joint part is fixed, and the other end (upper part) is fixed with a presser plate 16 and screws 17 so as to contact the two through rollers 15 and form a gap.

The housing 13 and the magnetic circuit 14 are fixed by fixing one end of the joint between the housing 13 and the magnetic circuit 14 as described above and bringing the other end into contact via the rollers 15.
Housing 13 due to the difference in linear expansion coefficient of the material.
Since the change in the vertical direction is performed by sliding on the rollers 15, there is little friction and no temperature stress is caused to the housing 13.

Further, the lower end of the housing 13 has a fixed contact surface with the magnetic circuit 14, and the upper end is in contact with the magnetic circuit 14 in the longitudinal direction of the roller 15 and is integrated with the housing, so that the housing 13 has rigidity and the resonance frequency does not become low.

Therefore, the housing 13 and the magnetic circuit 1 due to the difference in linear expansion coefficient between the housing 13 and the magnetic circuit 14
By the modification of No. 4, a structure that does not cause temperature stress at the joint between the two can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, by fixing the coupling portion between the housing of the carriage holding portion and the magnetic circuit at one end and bringing the other end into contact via rollers, a structure that does not cause deformation due to temperature stress can be obtained. The effect is great.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating an embodiment of the present invention;
Figures 2 and 3 are structural diagrams of conventional actuators.
In the figure, 1 is a magnetic head, 2 is an arm, 12 is a swing axis,
13 is a housing, 14 is a magnetic circuit, 15 is a roller, 16 is a holding plate, and 17 is a screw.

Claims (1)

[Claims] 1. The joint between the housing of the carriage holder, which is formed by fixing an arm having a magnetic head disposed opposite to a disk to a swing shaft, and a magnetic circuit that swings the swing shaft is fixed at one end and fixed at the other end. The actuator structure is characterized in that the housing/magnetic circuit is brought into contact with each other via rollers so as not to cause deformation of the housing/magnetic circuit due to temperature.