JPS62256271A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To reduce the positioning time of a magnetic head by driving an arm fitted with a magnetic head by a gear connected to a capstan and surrounding a gear connection part by an enclosed package sealed with a viscous liquid. CONSTITUTION:When a magnetic disk 1 is driven by a spindle motor 2, a capstan 10 is driven clockwise by a stepping motor 7, the arm 4 is driven around an arm shaft 12 via a gear 11 counter clockwise, resulting that the magnetic head 3 is moved from the inner circumference to the outer circumference. In driving the motor 7 counter clockwise, the magnetic head 3 is moved from the outer circumference to the inner circumference. In positioning the head 3 to a prescribed position on the disk 1, the vibration duration time at the positioning is reduced by the viscous friction effect by the viscous liquid 14 sealed in the enclosed package 13, the gear 11 and the capstan 10 and the positioning time is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to an improvement in a driving force transmission method.

[Conventional technology]

FIG. 8 shows a conventional magnetic disk device disclosed in Japanese Unexamined Patent Publication No. 59-58670. In the figure, 1 is a magnetic disk, 2 is a spindle motor for rotating the magnetic disk 1, 3 is a magnetic head for writing and reading information in the form of electrical signals on the magnetic disk 1, and 4 is a magnetic head. A swinging arm to which the head 3 is fixed and swings around a pivot 5, 6 is a capstan, 7 is a stepping motor directly connected to the capstan 6, and transmits driving force to the arm 4 via a steel belt 8. do. 9 is a spring for applying a constant tension to the steel heald 8.

Next, the operation will be explained. The spindle motor 2 rotates the magnetic disk 1 at, for example, 8,600 revolutions per minute. On the other hand, the capstan 6 is rotated by the stepping motor 7, and the driving force of the stepping motor 7 is transmitted at a reduced speed to the arm 4 via the steel belt 8 to which a constant tension is applied by the spring 9. As a result arm 4
swings around the pivot 5 and is positioned at a predetermined position on the magnetic disk 1. This makes it possible for the magnetic head 3 to write information on the magnetic disk 1 and to read information that has already been written.

[Problem that the invention seeks to solve]

The head positioning device of a conventional magnetic disk device is constructed as described above, but the steel belt 8 for decelerating and transmitting the driving force of the stepping motor 7 to the arm 4 is usually extremely thin with a thickness of 20 to 85 μm. Therefore, it was necessary to take measures against band breakage. Further, there is a problem in that the positioning time when positioning the head is lengthened due to the influence of the moment of inertia of the stepping motor, the quadrature motor, and the entire system.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a magnetic disk device that can position a head without using a steel belt and shorten the positioning time.

[Means for solving problems]

The magnetic disk device according to the present invention uses a gear connection to transmit the driving force from the stepping motor to the arm, and enables deceleration transmission by setting the gear ratio. [Function] In this invention, since a steel belt is not used, the problem of belt breakage can be solved and reliability is improved. Furthermore, since the gear connection portion is immersed in the viscous fluid, the braking effect due to the viscous friction can shorten the time for determining the position 1a, improving the characteristics.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, numbers 1 to 4.7 are the same as those of the conventional example, so their explanation will be omitted. 10 is a gear-shaped capstan directly connected to the stepping motor 7; 11
is a gear that meshes with the capstan 10 and is fixed to the arm shaft 12, and 13 is a sealed container that houses the capstan 10 and gear 11. A viscous fluid 14 is sealed in this container, and the arm Axis 12 and stepping motor 7
A through hole for the shaft is provided. 15 is a screw for fixing the closed container 13.

Next, the operation will be explained. When the magnetic disk 1 is being rotated by the spindle motor 2, the stepping motor 7
The capstan] 0 is rotated clockwise, and the arm 4 is rotated counterclockwise about the arm shaft 12 via the gear 11. As a result, the magnetic head 3 is moved from the inner circumferential side to the outer circumferential side. do.

In addition, in order to move from the outer circumference to the inner circumference, the stepping motor 7 may be rotated counterclockwise in the opposite direction to the above. Furthermore, when positioning the head 3 at a predetermined position 1a on the disk 1, the vibration duration during positioning is shortened due to the viscous friction effect between the viscous fluid 14 sealed in the sealed container 13, the gear 11, and the capstan 10. It becomes like this.

Note that instead of the stepping motor 7 in the above embodiment,
A similar effect can be expected by using a continuous rotation motor such as a DC) motor. Furthermore, it can be applied not only to magnetic disks but also to optical disk devices and magneto-optical disk devices.

〔Effect of the invention〕

As described above, according to the present invention, the driving force is transmitted from the stepping motor to the arm by a gear connection without using a steel belt, which solves the problem of belt breakage. Since it is configured to be immersed in viscous fluid, positioning time can be shortened.
This has the effect of providing products with high reliability and characteristics.

[Brief explanation of drawings]

Fig. 1 is a plan view of a magnetic disk device showing an embodiment of the present invention, Fig. 2 is a cross-sectional view of its main parts, and Fig. 8 is a plan view showing a conventional magnetic disk device. is a magnetic disk, 2 is a spindle motor, 3 is a magnetic head, 4 is an arm, 7 is a stepping motor, 1
0 is the capstan, 11 is the gear, the branch is the arm shaft, 13
is a closed container, and 14 is a viscous fluid. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (2)

[Claims] (1) A magnetic disk device characterized in that a gear connection is used to transmit driving force between an arm to which a magnetic head is fixed and a capstan, and the gear connection is surrounded by an airtight container filled with viscous fluid. (2) A magnetic disk drive according to claim 1, wherein a gear is directly connected to the arm shaft of the magnetic head, and the gear is engaged with a gear-shaped capstan.