JP2002343071A - Magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize the enhancement of rigidity and the reduction of a weight and size required for designing an enclosure with a simple structure and to position a magnetic head with high accuracy. SOLUTION: This magnetic disk device has a magnetic recording medium 3 for magnetically holding information, a motor 4 for rotating the magnetic recording medium, a magnetic head 7 for recording or reproducing the information to or from the magnetic recording medium, a carriage 8 for positioning the magnetic head by moving on the magnetic recording medium, a base 2 for fixing the motor and the carriage and a cover 20 fastened to the base by means of screw via sealing members 13. A reinforcing member 1 of a high- rigidity material is arranged in the space between the magnetic recording medium 3 and the cover 20 and the reinforcing member is fixed to the cover and the base by utilizing screws for fastening. The reinforcing member consists of a rib structure of a rugged shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive, and more particularly to an enclosure structure (comprising a base and a cover) of a magnetic disk drive for magnetically recording and reproducing information. Things.

[0002]

2. Description of the Related Art Conventionally, a base structure of a magnetic disk drive has a rib or the like provided on a base or a cover for a base or a cover for supporting a disk rotating portion or an actuator. It had a structure that increased only its own rigidity.

[0003] Japanese Patent Application Laid-Open No. 5-2585 discloses a method for reducing vibration.
As described in Japanese Patent Application Publication No. 45-45, there is a method in which a plate is attached to a cover through a viscous member and the plate is attached to a motor and a head positioner to reduce the vibration of the cover.

[0004] Japanese Patent Application Laid-Open No. 5-28736 discloses that
It is disclosed that an external mounting member provided with a reinforcing member and a damping material is attached to a base structure via a vibration isolating leg in order to reduce the rotational vibration of the entire base generated during a seek operation.

[0005]

The capacity of magnetic disk devices is increasing year by year, and the density of information (recording tracks) on concentric circles on a disk is increasing. Positioning is required to be highly accurate.
For this reason, supporting members including a base and a cover for supporting both the disk rotating part and the actuator are provided with a high rigidity for realizing a higher vibration frequency range and a lower vibration amplitude. Is required.

[0006] Further, the magnetic disk drive has been increasingly mounted on PCs, and has been reduced in size. The weight of the magnetic disk drive has also been a great limitation, which is a constraint on the design of the apparatus. In addition, efficient enhancement of the rigidity of the enclosure has become an important issue, for example, realizing low noise by low vibration.

According to the prior art described in the above-mentioned Japanese Patent Application Laid-Open No. Hei 5-28736, a mounting member provided with a reinforcing member and a damping material is mounted on a base structure. HDA with data
(Head Disk Assembly) has a high rigidity effect and a high damping effect. On the other hand, thinning and miniaturization of the entire magnetic disk device have not been sufficiently considered.

An object of the present invention is to realize high rigidity and light weight and small size required for the design of an enclosure with a simple structure, and to realize high-precision positioning of a magnetic head on a recording track. It is an object of the present invention to provide a magnetic disk drive which can provide a mechanism and can achieve small size, light weight and low noise.

[0009]

In order to solve the above problems, the present invention mainly employs the following configuration. A magnetic recording medium that magnetically holds information, a motor that rotates the magnetic recording medium, a magnetic head that records or reproduces information on the magnetic recording medium, and a magnetic head that moves on the magnetic recording medium and A carriage for positioning the head, a base for fixing the motor and the carriage, and a cover fastened to the base by screws via a sealing member;
A reinforcing member made of a highly rigid material is disposed in a space between the magnetic recording medium and the cover, and the reinforcing member uses the fastening screw to cover the cover. And a magnetic disk drive fixed to the base.

Further, in the magnetic disk drive, the reinforcing member has an uneven rib structure.

In the magnetic disk drive, the reinforcing member may have a planar shape and be covered with an adhesive or an adhesive tape, in addition to being fixed by the fastening screw.
Magnetic disk unit to be fixed to.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic disk drive according to an embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a side view showing a basic structure of a magnetic disk drive according to an embodiment of the present invention, and FIG. 2 is a plan view showing a basic structure of the magnetic disk drive according to the present embodiment, which is seen through a cover. FIG. 3 is a detailed view showing a related structure of a base, a cover and a reinforcing plate in the present embodiment. FIG. 4 is a diagram showing a configuration example of a magnetic disk drive according to another embodiment of the present invention.

According to the basic structure of the magnetic disk drive shown in FIGS. 1 and 2, a disk 3 which uses aluminum or glass as a substrate material and has a magnetic film formed on the surface thereof is used for magnetically retaining information. Is driven to rotate.
The spindle motor 4 includes a hub 5 for laminating the disks 3 and a disk clamp 6 for fixing the disks 3 to the hub 5. The hub 5 is mounted on a motor shaft provided on the base 2 via a bearing. To rotate.

The disk 3 is floated on the surface of the rotating disk 3 while keeping a constant space of only about several tens of nm to convert between an electric signal for magnetically writing or reading information and a magnetic field. A head 7 (FIG. 2) made of a material mainly formed of a ferrite or a metal thin film provided with an electromagnetic coil and a disk 3
A carriage 8 made of aluminum or magnesium for accurate positioning is disposed on the surface.
The carriage 8 and the head 7 are composed of a coil 9 wound with an aluminum wire or a copper wire having an insulating film, a permanent magnet 10a, and a yoke 10b for supporting the permanent magnet and forming a magnetic circuit. The voice coil motor 10 is driven and positioned.

The outer shape of the coil 9 is held by resin molding.
It is formed integrally with the carriage 8. The carriage 8
Like the spindle motor 4, the carriage rotates on a carriage shaft provided on the base 2 via a bearing.

The signal at the time of reading / writing of the head 7 is
Is transmitted to an FPC 11 (flexible printed circuit board) fixed to the carriage 8 by a thin wire of an electromagnetic coil provided on the carriage 8 and is located on the lower surface thereof through a read / write control board 12 for controlling a signal at the time of reading and writing.
Or a hermetically sealed connector provided by bonding to a base 2 made of stainless steel or iron.
It is transmitted outside the HDA (Head Disk Assembly; mainly composed of a disk rotation system, a head actuator, an enclosure, a disk, etc.).

The hermetically-sealed connector relays an electric signal between the inside and outside of the HDA, and has a plurality of pins for transmitting signals and a molded part for holding the pins are hermetically sealed. . The drive current of the coil 9 is also transmitted to the sealed connector through the FPC 11. The drive current of the spindle motor 4 is also transmitted to the sealed connector by the motor FPC guided from the spindle motor 4. The sealed connector is HDA
The information is transmitted to a main board for controlling a device provided outside. Incidentally, an integrated structure in which the main board is attached to an HDA is generally referred to as an HDD (Hard Diss).
k Drive).

The spindle motor 4, the shaft of the carriage 8, and the voice coil motor 10 are fixed to the base 2 with screws. A cover 20 made of aluminum is provided with a packing 13 around the entire circumference of the base 2 in order to keep the base 2 sealed.
, Spindle motor 4, shaft of carriage 8, voice coil motor 10 with screws 21a to 21f through
Fixed to.

The HDA having the above-described structure is designed to accurately process signals in the operation state of writing or reading information between the head 7 and the disk 3.
Since the inclusion must not enter this space and obstruct the magnetic path, it must be kept clean at all times. Therefore, the internal circulation filter 14 is provided, and the air circulation system inside the HDA generated by the rotation of the disk 3 It captures internal dust.

The large-capacity magnetic disk drive has a plurality of disks 3 mounted thereon in order to obtain a storage capacity, and the heads 7 are provided on the surfaces of the disks 3.
A disk spacer 15 is provided between the disks 3 and the distance between the heads 7 is kept constant by precisely finishing the mounting surface of the carriage 8 on the head 7. A reinforcing plate 1 (the function and function of which will be described later) is attached to the enclosure including the base 2 and the cover 20 by using the four screws 21a to 21d. .

As shown in FIGS. 2 and 3 (enlarged view taken along the line AA in FIG. 2), the reinforcing plate 1 has a space provided between the upper surface of the cover-side disk and the cover 20. And the base 2 is covered with the screws 21a to 21d.
20 together. O-rings 22 having a sealing function are arranged in the openings (four places) for the screws to secure the inside and outside of the enclosure.

The reinforcing plate 1 is made of a high-rigidity stainless steel plate or an iron-based material. By providing the ribs 23 having a convex shape, the reinforcing plate 1 causes a decrease in the rigidity of the enclosure. (2) It is possible to reinforce the opening in the upper surface of the disk 2 in the plane direction (suppress the inclination of the disk rotation axis from the vertical direction). In other words, as shown in FIG. 3, the convex ribs are arranged in the empty space existing between the disks of the cover 20, and the rigidity of the enclosure and, by extension, the magnetic disk device as a whole is enhanced by the unevenness of the reinforcing plate. At the same time, the rib is brought into contact with the base and the cover to achieve high rigidity.

The flat portion for holding the packing 13 is constituted by a cover 20, and the reinforcing plate itself contributing to the improvement in rigidity is separated from the function of sealing the inside of the enclosure. The cover which requires a large area due to the necessity of the above-mentioned flat portion can be formed of lightweight aluminum, and by arranging a high-rigidity reinforcing plate even when the rigidity is reduced by the aluminum cover. , Lightweight and high rigidity.

FIG. 4 shows a magnetic disk drive according to another embodiment of the present invention. The planar reinforcing plate is fixed on the cover with an adhesive or an adhesive tape 24, so that a high rigidity in which both the rigidity of the cover and the reinforcing plate are combined can be obtained.

As described above, the feature of the embodiment of the present invention is that a reinforcing plate is provided on the conventional base cover structure, and the base cover is fixed by screws to fasten the enclosure. -High rigidity was realized. In addition, select a material with high rigidity for the reinforcement plate by another member,
By configuring the rib shape, efficient high rigidity can be achieved. By arranging the reinforcing plate using the empty space on the lower surface of the conventional cover, it is possible to achieve a reduction in size and thickness.

[0026]

According to the present invention, it is possible to provide an enclosure for a magnetic disk drive which enables high-precision positioning of a magnetic head, high-density mounting of the apparatus, and reduction in size and weight.

[Brief description of the drawings]

FIG. 1 is a side view showing a basic structure of a magnetic disk drive according to an embodiment of the present invention.

FIG. 2 is a plan view showing a basic structure of the magnetic disk drive according to the embodiment, which is seen through a cover.

FIG. 3 is a detailed enlarged view showing a related structure of a base, a cover and a reinforcing plate in the embodiment.

FIG. 4 is a diagram showing a configuration example of a magnetic disk device according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reinforcement plate 2 Base 3 Disc 4 Motor 5 Hub 6 Clamp 7 Head 8 Carriage 9 Coil 10 VCM 10a Magnet 10b Yoke 11 FPC 12 Read light control board 13 Packing 14 Internal circulation filter 20 Cover 21 Screw 22 O-ring 23 Rib 24 Adhesive or adhesive tape

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference)

Claims (5)

[Claims] A magnetic recording medium for magnetically holding information; a motor for rotating the magnetic recording medium; a magnetic head for recording or reproducing information on the magnetic recording medium; A magnetic disk drive comprising: a carriage for moving and positioning the magnetic head; a base for fixing the motor and the carriage; and a cover fastened to the base by screws via a sealing member. A reinforcing member made of a highly rigid material is disposed in a space between the magnetic recording medium and the cover, and the reinforcing member is fixed to the cover and the base using the fastening screw. A magnetic disk drive characterized by being performed. 2. The magnetic disk drive according to claim 1, wherein the reinforcing member has an uneven rib structure. 3. The magnetic disk drive according to claim 1, wherein the reinforcing member is made of stainless steel or an iron-based material. 4. The magnetic disk drive according to claim 1, wherein the reinforcing member has a planar shape and is fixed to the cover with an adhesive or an adhesive tape in addition to fixing with the fastening screw. A magnetic disk drive characterized by the above-mentioned. 5. The magnetic disk drive according to claim 1, wherein the base and the cover are made of aluminum.