JPS61237274A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To reduce parts for carrying out a compensation for temperature and decrease an off-track by constituting a carriage arm with a member composed of plural materials different in coefficient of thermal expansion. CONSTITUTION:A magnetic head 1 is attached to an end of a load arm of a flexible spring member and a carriage arm 3 is constituted of a head arm 11 and a flexible arm 12. The arm 11 uses an aluminum material and the arm 12 uses a steel material and the arm 3 is rotatably supported by a pivot shaft 4. The arms 11 and 12 are connected by two screws 13, 14. The screw 14 makes a passing hole 15 of the arms 11, 12 long hole and fastens adjusting the distance to the screw 13 by a washer 16. Accordingly, by a rise in temperature, a large thermal deformation is generated in the arm 11 having a large coefficient of thermal expansion and a bimetal deformation is generated between connecting sections of a connecting part, a position of the head can be corrected and the distance between the screws 13, 14 can be freely adjusted, so that the amount of an off-track can be corrected and decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a magnetic disk device having a magnetic head at its tip and a support member that is driven and positioned at an arbitrary track on a recording medium disc, and particularly relates to The present invention relates to a magnetic disk device suitable for compensating for misalignment of a magnetic head due to the above.

[Background of the invention]

A magnetic disk drive is required to accurately position a head relative to a track so that information recorded on a medium by a magnetic head can be reproduced even when the environmental temperature changes. Aluminum is generally used for the rotating support member to which the disk disk, base, and bed, which are the main mechanisms of the device, are attached, but the magnetic head, which forms the head section, is fixed with a flexible thin stainless steel material. Further, a stainless steel belt material is also used for the driving force transmission member of the support member. Therefore, the difference in thermal expansion between the materials causes head drag misalignment (hereinafter referred to as off-track), resulting in malfunctions in recording or reproduction. As a means for compensating for this, there is a servo surface servo system that uses a head dedicated to positioning and a disk disk on which position information is recorded, in addition to the data head. However, recently, due to the need for smaller size and lower costs, there is a growing demand for disk drives with a thermal compensation mechanism that does not perform head positioning control. One such device is, for example, a system that compensates foretrack by appropriately arranging different materials, as described in Japanese Patent Application Laid-Open No. 57-172574. However, as a result, the mechanical system is complicated, and there is no versatility in specifying the types of materials for all of these parts. Furthermore, because the head driving force is transmitted through a thin shaft due to the structure, the high speed of head access is limited.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic disk device equipped with a temperature compensation mechanism that reduces off-track by reducing the number of components that perform temperature compensation.

[Summary of the invention]

The present invention provides a magnetic disk drive with a one-rotation actuator, in which a carriage arm serving as a head support member is composed of members made of a plurality of materials having different coefficients of thermal expansion, and bimetal deformation occurs between the joints of the members made of different materials. The structure is such that the amount of off-track is compensated for.

[Embodiments of the invention]

Embodiments of the hard disk device of the present invention are shown below in FIG.
This will be explained using FIG. A magnetic head 1 for recording and reproducing information is attached to the tip of a load arm 2, which is a flexible spring member. The carriage arm 3, which serves as a rotary support member having a magnetic head portion at its tip, is composed of a head arm 11 and a flex arm 12. The head arm 11 is made of aluminum, and the flex arm 12 is made of steel. This rotary arm 3 is rotatably supported by a pivot shaft 4.

The aforementioned rod arm 2 is provided at the tip of this arm 3, and a steel belt 5 for transmitting rotational power is connected to the other end. This steel belt 5 has an α-wound outer circumference around a cylindrical capstan portion 7 at the tip of a shaft of a step motor 6, and is fixed to the tip of a spring plate 8 for applying a constant tension. Further, the steel belt 5 is attached to the screw 17 at one point on the circumference of the capstan.
is fixed. Although not shown, the disk plate 9, which is a recording medium, is connected to a hub 1 directly connected to a spindle motor.
Laminated around the outer periphery of 0. FIG. 2 is a diagram showing a joint between the helad arm 11 and the flex arm 12 of the arm 3.

These spade arms 11 and flex arms 12 are
They are connected by real screws 13, 14.

Further, the screw 14 has an elongated hole 15 on the head arm 11 and flex arm 12 side, and is fastened using a washer 16 so that the distance to the screw 13 can be adjusted. With this configuration, the head arm 11, which has a large coefficient of thermal expansion as the temperature rises, undergoes larger thermal deformation, which causes bimetallic deformation between the joint parts of this joint part, making it possible to correct the head position. becomes. Furthermore, since the distance between the screws 13 and 14 can be adjusted, the length of the bimetal part can be adjusted freely for each model. Therefore, according to this embodiment, the off-track amount can be corrected and reduced by setting the two screw positions in accordance with the required correction amount.

〔Effect of the invention〕

According to the present invention, off-track caused by thermal deformation can be corrected without increasing the number of mechanical parts, and the amount of correction can be adjusted with easy operation.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a connecting portion between a helad arm and a flex arm. DESCRIPTION OF SYMBOLS 1... Magnetic head, 3... Arm, 4... Pivot shaft, 5... Steel belt, 7... Capstan part, 8... Spring part, 11... Head arm, 12 ...Flex arm.

Claims (1)

[Claims] 1. In a magnetic disk drive having a magnetic head at the tip and having a supporting member driven to position it on an arbitrary track of a recording medium disk, the supporting member is thermally expanded so as to be bimetallic deformed. 1. A magnetic disk device comprising two or more types of materials having different ratios and fastened together at two or more points. 2. The magnetic disk device according to claim 1, characterized in that the fastening portion is such that the distance between two points at which bimetal deformation can be freely adjusted.