JPH0896531A - Magnetic disk unit - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide a magnetic disk device which is advantageous in increasing the size and capacity of the device and which has an excellent anti-vibration effect. [Structure] A coil bobbin 13 and a coil 14, and a coil 14 and a balance weight 20 of a magnetic disk device are fixed with an adhesive 19 having a characteristic of having elasticity even after curing. [Effect] By being fixed by the adhesive 19, the vibration of the carriage is absorbed by the elasticity of the adhesive, and the vibration of the carriage can be reduced. Further, the adhesive does not require a special occupied space and is advantageous for downsizing the device. In addition, the coil bobbin has no special limitation, and the carriage can be integrated, so that there is no concern about dust generation and the reliability is high.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device which is advantageous for small size and large capacity of the device and which can reduce internal vibration of the device.

[0002]

2. Description of the Related Art Generally, a magnetic disk device records and reproduces data at a high density by using a magnetic head that aerobically floats on a magnetic disk that is rotating at a high speed. It is necessary to reduce the vibration of the carriage part.

In the magnetic disk drive according to the prior art, generally, the second moment of area of the bobbin is set large in order to reduce the vibration of the carriage. Bobbin cross section 2
The large secondary moment increases the rigidity of the bobbin and improves the vibration resistance. Further, it is considered that a structure for absorbing vibration is provided in a portion that easily resonates. For example, in Japanese Patent Laid-Open No. 3-183348,
It is described that a stainless steel plate for absorbing vibration is provided on the upper and lower surfaces of the coil / bobbin via an adhesive layer. Further, Japanese Patent Laid-Open No. 63-277458 discloses that the bobbin is made of ceramics having a high specific rigidity to increase the rigidity of the bobbin and improve the vibration resistance.

[0004]

In recent years, it has become important for a magnetic disk device to have a smaller size and a larger capacity, and it is important to increase the density.
The VCM requires a stronger magnetic force, and the VCM magnet and the yoke are getting larger.

In the above-mentioned prior art, for example, in the technology for improving the vibration resistance by increasing the second moment of area of the bobbin and increasing the rigidity, a large occupied space is required, and therefore a magnetic disk which requires a high density is required. Not suitable for smaller size and larger capacity of equipment.

Further, in the technique disclosed in Japanese Patent Laid-Open No. 3-183348, the vibration absorbing structure is relatively expensive, and it is also disadvantageous in the volume of the vibration absorbing structure and the miniaturization of the magnetic disk device.

Further, in the technique of constructing the bobbin with a ceramic having a high specific rigidity, it is difficult to integrate the carriage such as the head arm and the coil bobbin, and the ceramic powder is liable to be generated in the ceramic, so that the reliability of the magnetic disk device is improved. I have a problem.

An object of the present invention is to eliminate the above-mentioned problems caused by the prior art, which is advantageous for the small size and large capacity of the device.
Another object of the present invention is to provide a magnetic disk device having an excellent vibration damping effect.

[0009]

In order to achieve the above object, a magnetic disk device of the present invention comprises a magnetic recording disk for recording data, and a magnetic head for writing and reading data to and from the magnetic recording disk. A head arm that supports the magnetic head, a coil bobbin fixed to the head arm, and a coil wound around the coil bobbin,
Further, in a magnetic disk device that constitutes a voice coil motor by positioning a permanent magnet against the coil and positions the magnetic head, the coil bobbin and the coil are fixed by an adhesive,
The first feature is that the adhesive is an adhesive that has elasticity even after curing.

Further, a magnetic recording disk for recording data, a magnetic head for writing and reading data to and from the magnetic recording disk, a head arm for supporting the magnetic head, and a head arm fixed to the head arm. In a magnetic disk device that forms a voice coil motor by positioning a coil bobbin, a coil wound around the coil bobbin, and a permanent magnet that opposes the coil, and the magnetic head is positioned inside the coil. A second feature is that the balance weight is fixed to the base with an adhesive, and the adhesive is an adhesive having elasticity even after curing.

[0011]

In the magnetic disk device according to the first feature, since the coil bobbin and the coil are fixed by the adhesive having elasticity even after curing, the vibration of the carriage is absorbed by the elasticity of the adhesive, and the vibration of the carriage part Can be reduced. Further, since the adhesive is provided in the gap between the coil bobbin and the coil, no special occupying space is required, which is advantageous for downsizing the device. In addition, the coil bobbin has no special limitation, and the carriage can be integrated, so that there is no concern about dust generation and the reliability is high.

In the magnetic disk drive according to the second feature, since the coil and the balance weight are fixed by the adhesive having elasticity even after curing, the vibration of the carriage with the balance weight as a mass is caused by the elasticity of the adhesive. The vibration of the carriage portion can be reduced. In addition, the balance weight is provided inside the coil,
Further, since the adhesive is provided in the gap between the coil and the balance weight, no special occupying space is required, which is advantageous for downsizing the device.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a magnetic disk device according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a detailed view of the carriage portion of the magnetic disk device of this embodiment. FIG. 2 is a plan view for explaining the internal structure of the head disk assembly (hereinafter abbreviated as HDA) of the magnetic disk device according to this embodiment. 1 and 2, an HDA constituting a mechanical main body of a magnetic disk device according to the present invention includes a magnetic recording disk 1 for magnetically recording data, a spindle motor 2 for rotating the magnetic recording disk 1 at a constant speed, A magnetic head 3 that reads / writes data from / to the magnetic recording disk 1, and a carriage A that supports the magnetic head 3 and is rotatable about the rotation axis of a pivot bearing 4.
A voice coil motor (hereinafter abbreviated as VCM) 6 for rotatively driving the SSY 5 and the carriage ASSY 5 to position the magnetic head 3 on the magnetic recording disk 1 for reading / writing data, and transferring a signal from the magnetic head 3 to a circuit section FP
The main components include a C7 and a base 8 for mounting them.

Further, the carriage ASSY 5 has a head arm portion 10 for supporting the magnetic head 3, a coil bobbin 13 integral with the plurality of head arms 10, and a coil bobbin 13.
The coil 14 wound around the coil 14 and the permanent magnets 15a and 15b located above and below the coil 14 and the yoke 16
A magnetic circuit is configured with the VCM 6 including a and 16b.

FIG. 3 is a sectional view of the VCM carriage portion of this embodiment. In FIGS. 1 and 3, the coil bobbin 1
The gap between the coil 3 and the coil 14 is fixed by filling the gap with an adhesive 19. Here, the adhesive 19 is an adhesive having a property of having elasticity even after curing, and the vibration of the carriage generated when the carriage ASSY 5 is driven is absorbed by the elasticity of the adhesive, so that the vibration of the carriage portion can be reduced. Further, the coil 14 and the balance weight 20 are also fixed by filling the gap between them with the adhesive 19.
The vibration of the carriage, which is mainly caused by the mass of the balance weight 20, which is generated at the time of driving No. 5 is absorbed by the elasticity of the adhesive, and the vibration of the carriage portion can be reduced. Since all the bonding by the adhesive 19 fills the gaps between the adherends, no special occupied space is required and there is no problem in downsizing of the device.

[0016]

As described above, in the magnetic disk drive according to the present invention, since the coil bobbin and the coil are fixed by the adhesive having elasticity even after curing, the vibration of the carriage is absorbed by the elasticity of the adhesive. Vibration of the carriage unit can be reduced. Further, since the adhesive is provided in the gap between the coil bobbin and the coil, no special occupying space is required, which is advantageous for downsizing the device. In addition, the coil bobbin has no special limitation, and the carriage can be integrated, so that there is no concern about dust generation and the reliability is high.

Further, since the coil and the balance weight are fixed by the adhesive having elasticity even after curing, the vibration of the carriage having the balance weight as a mass is absorbed by the elasticity of the adhesive, and the vibration of the carriage is reduced. Can be made. Further, since the balance weight is provided inside the coil and the adhesive is provided in the gap between the coil and the balance weight, a special occupied space is not required, which is advantageous for downsizing the device.

[Brief description of drawings]

FIG. 1 is a detailed view of a carriage according to a first embodiment.

FIG. 2 is a plan view for explaining the internal structure of the HDA of the present embodiment.

FIG. 3 is a cross-sectional view of a VCM carriage unit according to the present embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Magnetic disk, 3 ... Magnetic head, 5 ... Carriage ASSY, 6 ... VCM, 13 ... Coil bobbin, 14 ... Coil, 15a, 15b ... VCM permanent magnet, 16a, 16b ... VCM yoke, 19 ... Adhesive, 20 ... Balance weight.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsushi Katsuta 2880, Kozu, Odawara-shi, Kanagawa Stock Company Hitachi Storage Systems Division

Claims (2)

[Claims] 1. A magnetic recording disk for recording data,
A magnetic head for writing and reading data to and from the magnetic recording disk; a head arm for supporting the magnetic head; and a coil bobbin fixed to the head arm.
In a magnetic disk device for winding a coil around the coil bobbin and further providing a permanent magnet against the coil to form a voice coil motor and positioning the magnetic head, the coil bobbin and the coil are separated from each other. A magnetic disk device, wherein the magnetic disk device is fixed by an adhesive, and the adhesive has elasticity even after being cured. 2. A magnetic recording disk for recording data,
A magnetic head for writing and reading data to and from the magnetic recording disk; a head arm for supporting the magnetic head; and a coil bobbin fixed to the head arm.
In a magnetic disk device for winding a coil around the coil bobbin and further providing a permanent magnet against the coil to form a voice coil motor and positioning the magnetic head, a balance weight is provided inside the coil. Is fixed by an adhesive, and the adhesive is an adhesive having elasticity even after curing.