JPS6358678A - Magnetic disc device - Google Patents

Abstract

PURPOSE:To absorb the vibrations with the transmitted to a magnetic head when a carriage main body is driven regardless of change in the temperature, by providing a damper member which absorbs the vibrations of the carraige main body at the inside of a coil bobbin via a rubber type elastic matter together with a damper weight. CONSTITUTION:A head arm 14 is attached to the carriage main body 13 and the magnetic head 15 is supported at the tip of the arm 14. The carriage 13 is set between a pair of magnets 16 set opposite to a carriage block 11 and produces vibrations when it is driven by a magnetic circuit 18 consisting of the magnets 16 and a coil bobbin 17. These vibrations are absorbed by a damper member 19 consisting of a damper weight 20 and set inside the bobbin 17 via a rubber type elastic matter 21. Thus it is possible to absorb effectively the vibrations which are transmitted to the magnetic head 15 from the carriage 13 via the arm 14 by means of the member 19 regardless of change in the temperature in the main body of a magnetic disk device.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a magnetic disk device.

(Prior Art) In recent years, magnetic disk devices have been widely used as external storage devices for personal computer forward processors and the like.

Examples of such conventional magnetic disk devices include the following.

FIGS. 6 and 7 are for explaining a conventional magnetic disk device, and in these figures, 1 indicates a frame-shaped carriage block. A support shaft 2 is vertically arranged on this carriage block 1.
A carriage body 3 is rotatably supported on this support shaft. A head arm 4 is attached to the carriage body 3, and a magnetic head 5 (not shown) for writing and reading data on a magnetic disk is supported at the tip of the head arm 4.

The carriage block 1 is also provided with a pair of magnets 6.6 facing each other, and the upper J carriage body 3 is positioned between the pair of magnets 6.6. A coil bobbin 7 is disposed, and the magnet 6.6 and the coil bobbin 7 constitute a magnetic circuit 8. A damper member 9 is provided inside the coil bobbin 7 of the magnetic circuit 8 to absorb vibrations generated when the carriage body 3 is driven by the magnetic circuit 8.

As shown in FIGS. 8 and 9, this damper member 9 has a damper weight 9a inside the coil bobbin 7.
A liquid elastic oil 9b such as silicone oil is interposed between the damper weight 9a and the coil bobbin 7, and the damper weight 9a is sealed with a lid 10.

In the magnetic disk device configured in this way, when the carriage body 3 is driven by the magnetic circuit 8,
Unnecessary vibrations transmitted to the magnetic head 5 are absorbed by the damper member.

By the way, the elastic oil 9b of the damper member 9 generally absorbs vibrations by converting them into thermal energy.

However, in the conventional magnetic disk device configured as described above, the viscosity coefficient of the elastic oil 9b of the damper member 9 changes due to temperature changes within the magnetic disk device main body, making it difficult to obtain a predetermined damping effect. Therefore, there is a problem in that the disturbance is transmitted to the magnetic head, making it impossible to normally write and read data to and from the disk.

(Problems to be Solved by the Invention) The present invention is intended to solve the above-mentioned conventional difficulties.When the carriage main body is driven, vibrations transmitted to the magnetic head via the head arm are suppressed regardless of temperature changes. It is an object of the present invention to provide a magnetic disk device that can effectively absorb data.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a carriage block having a support shaft, which is rotatably disposed on the support shaft, and a carriage block having a support shaft. A magnetic head supported by a head arm attached to the main body,
a magnetic circuit that drives the carriage body to move the magnetic head, the magnetic circuit comprising a pair of magnets disposed opposite to each other on the carriage block and a coil bobbin disposed between the pair of magnets and disposed on the carriage body; , in a magnetic disk drive including a damper member disposed inside the coil bobbin of the magnetic circuit and absorbing disturbances of the carriage body, the damper member is a damper weight disposed inside the coil bobbin. and a rubber-like elastic body interposed between this damper weight and the coil bobbin.

(Function) By the above means, the present invention can effectively absorb vibrations transmitted from the carriage body to the magnetic head via the head arm, regardless of temperature changes.

(Example) An example of the present invention will be described in detail below based on the drawings.

1 and 2 are for explaining a magnetic disk device according to an embodiment of the present invention, and in these figures, 1
1 indicates a frame-shaped carriage block. A support shaft 12 is vertically disposed on the carriage block 11, and a carriage body 13 is rotatably supported on the support shaft 12. A head arm 14 is attached to the carriage body 13, and a magnetic head 15 (not shown) for writing and reading data on a magnetic disk is supported at the tip of the head arm 14. Also, carriage block 11
A pair of magnets 16.16 facing each other are disposed, and the above-mentioned carriage body 13 is located between these pair of magnets 16.16, and a coil bobbin 17 is disposed on this carriage body 13. The magnet 16.16 and the coil bobbin 17 constitute a magnetic circuit 18. A damper member 19 is provided inside the coil bobbin of the magnetic circuit 18 to absorb vibrations generated when the carriage body 13 is driven by the magnetic circuit.

As shown in FIGS. 3 and 4, the damper member 19 described above has a damper weight 20 housed inside the coil bobbin 17, and a rubber-like elastic body between the damper weight 20 and the coil bobbin 17. 21 is interposed.

As this rubber-like elastic body 21, chlorobutyl rubber, natural rubber, silicone rubber, etc. can be used.

FIG. 5 shows the temperature dependence of the loss coefficient of each rubber. In addition,
In the figure, A is chlorobutyl rubber, B is natural rubber,
C1 is made of silicone rubber 1, and C2 is made of silicone rubber 2.

In the magnetic disk drive configured as described above, when the carriage body 13 is driven by the magnetic circuit 18, unnecessary vibrations of the carriage body are suppressed by the damper weight 20 and the rubber material, regardless of temperature changes inside the magnetic disk drive body. It can be effectively absorbed by the damper member 19 made of the elastic body 21.

In the embodiments described above, a swing arm type magnetic disk device has been described, but it goes without saying that the present invention may also be applied to a linear type magnetic disk device or a floppy disk device.

[Effects of the Invention] As described above, the magnetic disk drive of the present invention can effectively absorb vibrations transmitted from the carriage body to the magnetic head via the head arm, regardless of temperature changes.

[Brief explanation of the drawing]

FIG. 1 is a plan view for explaining a magnetic disk device according to an embodiment of the present invention, FIG. 2 is a partially sectional side view of FIG. 1, and FIG. 3 is for explaining the damper member of FIG. 1. plan view of
Fig. 4 is a side sectional view of Fig. 3, Fig. 5 is a diagram showing the temperature dependence of the loss coefficient of the rubber-like elastic body used in the damper member of Fig. 3, and Fig. 6 is a diagram of the conventional magnetic disk. A plan view for explaining the device; FIG. 7 is a partially sectional side view of FIG. 6;
8 is a partially sectional plan view for explaining the damper member of FIG. 6, and FIG. 9 is a side sectional view of FIG. 8. 11... Carriage block 12...
......Support shaft 13...Carriage body 14...
...Head arm 15...Magnetic head 16...Magnet 17...Coil bobbin 18... Magnetic circuit 19... Damper member 20... Damper weight 21...
...Rubber-like elastic body applicant Toshiba Corporation Patent attorney Sa Suyama - Figure 3 Figure 4

Claims (1)

[Claims] (1) a carriage block having a support shaft; a carriage body rotatably disposed on the support shaft; a magnetic head supported by a head arm attached to the carriage body; and a magnetic head disposed opposite to the carriage block. a magnetic circuit that drives the carriage body to move the magnetic head, the magnetic circuit comprising a pair of magnets and a coil bobbin disposed between the pair of magnets and disposed on the carriage body; and an inner side of the coil bobbin of the magnetic circuit. A magnetic disk drive comprising: a damper member disposed inside the carriage body for absorbing vibrations of the carriage body; and a rubber-like elastic body interposed between the magnetic disk drive and the rubber-like elastic body.