JPH07220450A - Magnetic disc apparatus - Google Patents

Abstract

PURPOSE:To simply mount a head arm to a base plate by forming a recessed part and a notch part in the range of a bottom plate of the base plate where the head arm moves. CONSTITUTION:When a head arm 7 is to be mounted on a base plate 1, a rotary shaft of the head arm 7 is fixed to a recessed part 8 integrally formed with the base plate 1 while a front end of the head arm 7 is projected outward from a notch part 26. Then, the head arm 7 is rotated to position heads 18, 18 above magnetic discs 10, 10 and, all the structural parts including a magnetic yoke 20, a flexible printed board 23, etc. are secured to the base plate l. A cover 31 is fitted to the base plate 1. Since the recessed part 8 is formed in a bottom plate 2 of the base plate 12 and the notch part communicating with the recessed part 8 is provided in a side wall 3 of the base plate 1, the head arm 7 is relatively easily attached/detached to the base plate 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relatively small magnetic disk device suitable for use in laptops, notebook computers and the like.

[0002]

2. Description of the Related Art Due to the miniaturization of computers, there is a demand for miniaturization of magnetic disk devices used as external storage devices for such computers.

On the other hand, a magnetic disk device is mainly constructed, a magnetic disk for directly recording data, a magnetic head for writing data to and reading data from the magnetic disk, and the magnetic head for the magnetic disk. There is a head arm that moves up and a voice coil motor that drives this head arm.

These parts are arranged on the base plate 20 and the head arm 56 is arranged so as to extend in the width direction of the base, as shown in US Pat. No. 5,025,335. Therefore, there is a problem that the space occupied by the voice coil motor for driving the head arm becomes large and the dimension of the base plate in the longitudinal direction becomes large.

Therefore, for example, in the magnetic disk device MD2080 manufactured by Erial Co., the head arm is arranged in parallel with the longitudinal direction of the base plate to reduce the dimension of the base plate in the longitudinal direction. At the time of mounting, a magnetic disk was inserted between the magnetic heads of the head arm by a jig, for example, and both were simultaneously mounted on the base plate. Therefore, a jig is required, and the workability is extremely poor. is there.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to mount a head arm on a base plate substantially parallel to the longitudinal direction of the base plate so that the head arm can be mounted on the base plate relatively easily. To do.

[0007]

According to the present invention, a magnetic disk rotated by a drive motor is mounted on one longitudinal direction of a substantially rectangular base plate, and a voice coil motor for driving a head arm is mounted on the other side. , When the head arm is arranged so as to be substantially parallel to the longitudinal direction of the base plate when it is located at the home position,
The base plate bottom plate is integrally formed with a recess at least in a range where the head arm moves, and a side wall of the base plate is provided with a notch communicating with the recess.

Further, according to the present invention, a base plate is covered with a cover to form a storage chamber for storing magnetic disks and the like, and a convex portion for closing the notch is integrally formed on the cover.
And a stopper that regulates the rotation range of the head arm,
It is characterized by being mounted on the voice coil side of the rotating shaft that pivotally supports the head arm.

[0009]

When the head arm is mounted on the base plate, for example, the rotary shaft is fixed with the tip of the head arm protruding outward from the cutout portion of the base plate, and then the head arm is rotated and positioned on the magnetic disk. Therefore, it can be mounted relatively easily.

Further, since the stopper for restricting the rotation range of the head arm is located closer to the voice coil than the rotary shaft, the rotation range of the head arm is not restricted by the stopper when the head arm is mounted, and workability is improved. Can be further improved.

Further, by covering the cutout portion with a convex portion integrally formed with the cover, workability at the time of assembly can be improved and damage to the tape can be caused as compared with the case where the cutout portion is covered with a tape or the like. The occurrence of defects can be prevented.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described first with reference to FIGS. 1 and 2. (1) is a substantially rectangular base plate formed by molding an aluminum alloy or the like, and a side wall (3) is formed on the outer peripheral edge of the bottom plate (2). ) Is formed, and a mounting hole (5) for mounting the drive motor (4) is drilled at an appropriate position on the bottom plate (2), and the mounting positions of the voice coil motor (6) and the head arm (7) are formed. In addition, a deeper recess (8) is integrally formed.

On the rotary shaft (9) of the drive motor (4), for example, magnetic disks (10) and (10) having a magnetic material attached to the surface of a glass disk, a spacer ring (11), a disk clamp ( It is fixed by screws (13) via 12).

On the other hand, the head arm (7) is fitted with a bearing (14) such as a ball bearing and is rotatably supported on the base plate (1) by a rotating shaft (15) of the bearing. ), A plurality of suspension arms connected to the tip side of this base arm (17) (17), and a plurality of magnetic heads attached to the tip of this suspension arm.
(18) (18) ... and a voice coil (19) connected to the rear end of the base arm (16).

The voice coil motor (6) has magnetic yokes (20) and (21) fixed to the base plate (1) with screws so as to sandwich the voice coil (19) from above and below, and one of the magnetic yokes. It is composed of a magnet (22) fixed to (20).

(23) is a flexible printed circuit board (hereinafter referred to as "F") made of a polyester resin film or the like fixed adjacent to the voice coil motor (6) of the base plate (1).
The head (18) (18) is attached with the IC (24) that converts the signal to the head (18) (18)
..The lead part (25) for transmitting a signal to is integrally formed.

Reference numeral (26) is a notch formed in the side wall (3) of the base plate (1) near the head arm (7), and at least the head arm (7) shown by the broken line in FIG. 2 is the magnetic disk. (10) It has a length such that it can rotate to a position away from the upper surface of (10), and in the embodiment, it is the length from the tips of the heads (18), (18) ... to the bearing (14).

(27) is a stopper made of nylon resin, ABS resin or the like fixed between the voice coil motor (6) of the base plate (1) and the FPC (23), and is a rotation range of the head arm (7). A pair of abutment parts (28) and (29) are integrally formed with a space corresponding to
In place of (6), a metal fitting (30) made of magnetic metal that reciprocates between the contact portions is fixed, and the metal fitting and the contact portion (28) are fixed.
(28) regulates the range of rotation of the head arm (7). If the abutting portions (28) and (29) are composed of magnets, the head arm (7) can be positioned on the innermost circumference or outermost circumference of the magnetic disks (10) (10).

Reference numeral (31) is a metal cover that covers the mounting surface of the magnetic disk (10) (10) of the base plate (1) and forms a storage chamber (32) with the bottom plate (2). As shown in FIG. 3, the side surface (33) has a convex portion (34) for closing the cutout portion (26).
Are integrally formed.

When mounting the magnetic disk (10) (10), head arm (7), etc. on the base plate (1), the drive motor (4) is fixed in the mounting hole (5). The magnetic disks (10) and (10) are mounted on the rotating shaft (9), and the other magnetic yoke (21) is fixed to the base plate (1). Then, the head arm (7) is first moved to the broken line in FIG. The rotating shaft (15) is fixed to the base plate (1) with its tip protruding outward from the notch (26) as shown in FIG. 2, and then the head arm (7) is rotated to rotate the head (18) ( 18) the magnetic disk
(10) After being located above (10), one magnetic yoke (20),
By assembling all the components such as the FPC (23) and the stopper (27) to the base plate (1), and then fixing the cover (31) to the base plate (1), it is possible to assemble relatively easily.

When mounting the magnetic disks (10) (10) and the head arm (7) on the base plate (1), the head arm (7) is mounted on the base plate (1) and the broken line in FIG. After being placed in the state shown by, the magnetic disk (10) (1
0) may be attached to the base plate (1).

Although two magnetic disks (10) and (10) are used in the above embodiment, the number of magnetic disks is not limited to two, and one or three or more may be used.

[0023]

According to the structure of the present invention, the head arm is disposed so as to be substantially parallel to the longitudinal direction of the base plate. In the base plate bottom plate, at least a recess is integrally formed in the range in which the head arm moves.
By providing the notch communicating with the recess on the side wall of the base plate, it is possible to relatively easily attach / detach the head arm to / from the base plate, and it is possible to improve productivity by improving workability.

Further, by providing the cover for covering the mounting surface of the magnetic disk or the like of the base plate with the convex portion for closing the notch, the convex portion firmly and surely closes the notch,
The reduction in strength due to the formation of the cutout portion can be reinforced by the convex portion.

Further, since the stopper for restricting the rotation range of the head arm is attached to the voice coil side of the rotation axis of the head arm, the stopper does not obstruct the movement of the head arm through the notch, and the head arm is attached. The workability at the time can be further improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment according to the present invention.

FIG. 2 is a plan view also showing the operation according to the embodiment of the present invention.

FIG. 3 is an exploded side view showing an embodiment according to the present invention.

[Explanation of symbols]

 1 Base Plate 2 Bottom Plate 3 Side Wall 4 Drive Motor 6 Voice Coil 7 Head Arm 8 Recess 10 Magnetic Disk 15 Rotating Shaft 26 Notch 27 Stopper 31 Cover 32 Storage Chamber 34 Convex

Claims (3)

[Claims] 1. A magnetic disk rotated by a drive motor is mounted on one side of a substantially rectangular base plate in a longitudinal direction, and a voice coil motor for driving a head arm is mounted on the other side of the base plate, and the head arm is set at a home position. The base plate is arranged so as to be substantially parallel to the longitudinal direction of the base plate, the recess is integrally formed in at least the range in which the head arm moves of the base plate bottom plate, and the recess is formed on the side wall of the base plate. A magnetic disk device characterized in that a cutout portion that communicates is provided. 2. The base plate is covered with a cover to form a storage chamber for storing the magnetic disk and the like, and a convex portion for closing the cutout portion is integrally formed with the cover. The magnetic disk device according to claim 1. 3. The magnetic disk drive according to claim 1, wherein a stopper for restricting a rotation range of the head arm is mounted on a voice coil side of a rotation shaft pivotally supporting the head arm. .