JP3092261B2 - Disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive using a magnetic disk formed as a small hard disk as a recording medium, and more particularly, to a disk rotation driving mechanism for driving a disk at a substantially central portion of a chassis. The present invention relates to a disk drive device provided with a head arm drive motor disposed at one end of the chassis to move a recording / reproducing head for recording / reproducing information signals on / from the disk in a radial direction of the disk.

[0002]

2. Description of the Related Art A disk drive using a small hard disk having a diameter of, for example, 2.5 inches as a recording medium is capable of accessing data recorded on the disk at high speed and storing a large amount of data. Therefore, it is used as an external storage device of an information processing apparatus such as a computer. In particular, this kind of small disk drive is widely used as a portable external storage device such as a so-called laptop computer or word processor. Therefore, an example of a conventionally proposed disk drive device using a magnetic disk configured as a small hard disk as a recording medium will be described with reference to the drawings.

This disk drive is constructed as shown in FIG. 1. A magnetic disk 52 serving as a recording medium includes a housing 5 which forms a part of an outer casing.
1 and is integrally mounted on a disk table 53 constituting a disk rotation drive mechanism provided in the disk drive 1. The magnetic disk 52 integrally mounted on the disk table 53 is rotated at a high speed in the direction of arrow a in FIG. 1 by a spindle motor 54 constituting a disk rotation drive mechanism. In the housing 51, an actuator 57 including a head arm 55 and a voice coil motor 56 is provided. This head arm 55
It is attached via a bearing or the like so as to be rotatable about the support shaft 58 horizontally in the directions indicated by arrows b and c in FIG. A magnetic head device 59 including a recording / reproducing head and a control head is attached to the tip of the head arm 55. The voice coil motor 56 for driving the head arm includes a voice coil 60 provided at the rear end of the head arm 55, a fixed yoke fixedly disposed on the housing 51, and a magnetic circuit 61 including permanent magnets.

Flexible cables 64 and 65 formed by using a flexible printed circuit board as a connecting member between the head arm 55 and the control circuit section 62 on the fixed side.
Are arranged in a curved manner. The flexible cables 64 and 65 are formed of a thin, flexible, flexible printed circuit board having a belt-like shape, and have one ends 64 a and 65 a fixed to the head arm 55.
The other ends 64b and 65b are connected and fixed to input / output end positions of the control circuit unit 62. One flexible cable 64
Electrically connects the moving magnetic head device 59 and the fixed-side control circuit unit 62. The other flexible cable 65 is connected to the moving voice coil motor 60.
And the fixed-side control circuit unit 62 are electrically connected.
A lid is attached to an upper portion of the housing 51, and the entire housing 51 has a sealed structure.

[0005] This disk drive device has a magnetic disk 5
1 is rotated at high speed in the direction of arrow a in FIG. 1 by a spindle motor 54, while the head arm 55 is
The reciprocating drive is performed in the direction or the arrow c direction. Then, the magnetic head device 59 lifted from the recording surface of the magnetic disk 52 with a slight gap of a submicron unit by the high-speed rotation of the magnetic disk 52 extends along the radial direction on the recording surface of the magnetic disk 52. Reciprocate. The magnetic head device 59 records or reproduces information signals on the magnetic disk 52. In this recording / reproducing, a recording / reproducing signal, a servo information signal, etc.
It is exchanged via 4, 65. At this time, when the head arm 55 reciprocates, the flexible cables 64, 65
Follows the reciprocating motion of the head arm 55 by bending and extending the curved portions 64c and 65c.

With such a configuration, a disk drive device using a magnetic disk formed as a hard disk as a recording medium cannot perform high-speed access and record a large amount of information signals, and is used as an external storage device such as a computer. Have been.

A disk drive device having a built-in small magnetic disk is integrated with a computer to provide functions such as storage capacity and data access speed of a laptop type computer which can be used anywhere regardless of location. Is up. As described above, even though the portable laptop type computer in which the disk drive device is integrated is small, there is no big difference in the storage capacity and the function of the information signal as compared with the desktop type computer.

[0008] The laptop type computer in which the disk drive device is integrated has a configuration in which it is merely superposed, and therefore is thicker than a single computer.

Therefore, it is desired to further reduce the size and weight of devices using a disk drive as an external storage device, such as a portable laptop type computer in which a disk drive is integrated. For this reason, the thickness of the disk drive, which is an important factor in the thickness of the device, is being reduced.

[0010]

In a disk drive, electronic components such as ICs are mounted on a chassis and on a printed circuit board disposed on one side of the chassis. Further, in the arrangement of a spindle motor constituting a disk rotation drive mechanism having the highest height of the disk drive device, when a printed circuit board is disposed so as to overlap in the height direction of the spindle motor, the disk The overall height of the drive is at least the height of the spindle motor plus the thickness of the printed circuit board. Therefore, it is extremely difficult to reduce the thickness of the disk drive.

Accordingly, the present invention is proposed for the purpose of realizing a thinner and smaller disk drive using a magnetic disk formed as a hard disk as a recording medium.

Another object of the present invention is to improve the mounting efficiency of electronic components and to further reduce the thickness and size of a disk drive.

Still further, the present invention realizes the hermeticity of the apparatus main body, and prevents a disk built in the apparatus main body from being soiled or corroded by the infiltrated outside air or the like entering the apparatus main body. The purpose is to:

[0014]

In order to achieve the above-mentioned object, the present invention proposes a drive motor for rotating a disk substantially at the center of a chassis, and an information signal for the disk. A head arm drive motor for rotating the head arm on which the recording / reproducing head is mounted to move the recording / reproducing head in the radial direction of the disk is provided at a corner on one end side of the chassis. In the disk drive device provided, a first concave surface portion on which the disk is rotatably disposed is formed in a region on an inner side surface facing the disk, and a region where the head arm moves and a head arm drive motor are disposed. A second concave surface portion deeper than the first concave surface portion is formed in a region on the inner surface side to be formed, and an outer surface side facing the first concave surface portion is formed. A first outer surface-side concave surface portion formed in a region, and a second outer surface-side concave surface portion having a depth smaller than that of the first outer surface-side concave surface portion in an outer surface-side region opposed to the second concave surface portion; A chassis in which a bulging portion having a motor mounting recess in which the drive motor is disposed is formed substantially in the center where the drive motor is disposed, and a protruding portion protruding from the outer surface side, and the other end of the chassis A connector disposed on the side of the first outer surface side concave surface portion; and a motor mounted on the outer surface side of the chassis so as to cover the first and second outer surface side concave surface portions. A notch is formed to protrude the bulging portion formed with the mounting recess, and
And a printed circuit board which forms a storage space between the bottom surface of the second outer surface side concave surface portion and is attached to the outer surface side of the chassis, and first and second printed circuit boards.
Is disposed on the surface side facing the lower surface of the outer surface side concave surface portion of the
A first electronic component having a first height corresponding to a storage space formed between the printed circuit board and the first outer surface-side concave surface portion, and the printed circuit board and a second outer surface side The second corresponding to the storage space formed between the concave surface portion
And a lid mounted on the chassis to cover the disk, drive motor, recording / reproducing head and head arm drive motor disposed on the inner surface side of the chassis. is there.

[0015]

According to the present invention, a disk, a drive motor, a recording / reproducing head and a head arm drive motor are arranged in first and second concave surfaces provided on the inner surface of the chassis, and are provided on the outer surface of the chassis. Since the electronic components are arranged in the first and second outer surface side concave surface portions, each component can be arranged with high storage efficiency, the device itself can be made thinner, and provided on the inner surface side of the chassis. The concave surface is covered with a lid,
Since the outer surface side concave surface portion of the chassis is covered with the printed circuit board, the hermeticity of the space where each component is arranged can be ensured.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the disk drive according to the present invention will be described below with reference to the drawings.

As shown in FIG. 2, a disk drive according to the present invention comprises a chassis 10 in which a spindle motor 1 constituting a disk rotation drive mechanism for rotatingly driving a magnetic disk formed as a hard disk constitutes an apparatus main body.
It is arranged approximately in the center. The magnetic disk 2 built in the disk drive has a diameter of 2.5 inches and is integrally attached to a disk table that is rotated and driven by the spindle motor 1 as described later. The magnetic disk 2 is rotationally driven in the direction of arrow a in FIG. 2 by the spindle motor 1 integrally with the disk table.

A magnetic head device 3 for recording data on the magnetic disk 2 or reproducing data recorded on the magnetic disk 2 is provided in the disk drive. This magnetic head device 3
It is attached to the distal end of a head arm 5 that is rotated by a head arm drive motor 4 disposed in the disk drive. The head arm 5 is rotated by a head arm driving motor 4 about the head arm bearing 16 by a predetermined angle in the radial direction of arrow b in FIG. The data is moved to a target position where the above data is recorded and / or reproduced.

As shown in FIG. 3, the magnetic head device 3 includes a pair of opposing head chips 3a and 3b on both opposing surfaces of the magnetic disk 2. FIG. 3 shows a cross section along the line IV-IV in FIG.

As shown in FIG. 3, a head arm drive motor 4 for rotating a head arm 5 having the magnetic head device 3 attached to the distal end thereof is provided at a corner on one end of a chassis 10. I have. The head arm drive motor 4 includes a drive coil 4a attached to the rear end side of the head arm 5, a magnet 4b and a yoke 4c arranged to face the drive coil 4a.

The disk drive according to the present invention comprises an integrally formed chassis 10 on which a spindle motor 1 and a printed circuit board to be described later, on which various electronic components are mounted and a control circuit is mounted, are mounted. ing. The chassis 10 includes the spindle motor 1
The first concave surface portion 11 is formed in a region where the magnetic disk 2 mounted on the disk table rotated and driven by the magnetic disk 2 faces. This first concave surface portion 11
Is formed with a depth D ₁ sufficient to accommodate the magnetic disk 2. That is, the first concave surface portion 11 is formed slightly deeper than the thickness of the magnetic disk 2, and is formed with a depth sufficient for the magnetic disk 2 to freely rotate in the concave surface portion 11.

A second concave surface portion 12 is formed in a region where the head arm 5 of the chassis 10 to which the magnetic head device 3 is mounted and the head arm drive motor 4 for rotating the head arm 5 are provided. ing. This second
Concave surface portion 12 of is formed with a depth D ₂ enough to one of the head chip 3b of the magnetic head device 3 is arranged in a superposed state facing the magnetic disk 2 and the magnetic disk 2 I have.

The first and second concave surface portions 11, 12
Is formed on the outer peripheral edge on the inner side of the chassis 10 in which
A rising peripheral wall 13 is formed.

Further, in the center of the chassis 10 where the spindle motor 1 is disposed, the spindle motor 1
Motor mounting recess 14 arranged so that
Are formed. The portion of the chassis 10 where the motor mounting concave portion 14 is formed is a bulging portion 15 bulging to the outer side, which is the lower side in FIG. That is, the height of the chassis 10 from the tip of the rising peripheral wall 13 formed on the inner surface side to the bottom surface of the bulging portion 15 is:
The height H _{1 of the} chassis 10 is set.

The motor mounting recess 14 is
Is located at the center of the spindle shaft 22 of the spindle motor 1.
The shaft support portion 17 having a cylindrical shape through which is inserted is supported.

The spindle shaft 22 constituting the spindle motor 1 is integrally provided with a disk table 24 on which the magnetic disk 2 is mounted and a rotor magnet mounting piece 26 to which a rotor magnet 25 is mounted. That is, the disk table 24 corresponds to FIG.
As shown in FIG. 5, the rotor magnet mounting piece 26 is formed integrally with the outer periphery of the upper end side of the spindle shaft 22, and is formed so as to hang down on one side of the outer peripheral side of the disk table 24 so as to surround the spindle shaft 22. I have. The rotor magnet 25 is integrally mounted on the inner peripheral surface side of the rotor magnet mounting piece 26. Thus, the disk table 24 and the rotor magnet 2
The spindle shaft 22 integrally provided with the rotor magnet attachment piece 26 to which the rotor 5 is attached is attached to the spindle motor 1.
Of the rotor.

The disk table 24 provided integrally with the spindle shaft 22 is provided with a motor mounting recess 14.
The magnetic disk 2 is mounted so as to face the opening edge side. This magnetic disk 2 has a disk table 2
The center hole 2a is fitted into a protrusion 24a protruding from the center of the base 4 and the peripheral edge of the center hole 2a is supported on a disk mounting step 24b formed around the protrusion 24a. The mounting position is determined and mounted on the disk table 24. Therefore, the disk table 24 is formed so that the magnetic disk 2 is located at a height that is located in the first concave surface portion 11.

The magnetic disk 2 mounted on the disk table 24 is supported by a disk clamper 31 mounted on the disk table 24 via fixing screws 30, and is integrated with the disk table 24. That is, the magnetic disk 2 is sandwiched between the disk table 24 and the disk clamper 31 and is integrally attached to the disk table 14, and is rotated by the spindle motor 1 integrally with the disk table 24.

As described above, the spindle motor 1 for rotatingly driving the magnetic disk 2 is integrated with the chassis 10 constituting the apparatus main body of the disk drive according to the present invention. The inner surface of the chassis 10 on which the spindle motor 1 and the magnetic disk 2 are disposed is closed by an upper lid 35. The upper lid 35 is fixed to the chassis 10 by a fixing screw screwed into a screw fixing portion provided at each corner on the inner side surface of the chassis 10.

In the disk drive according to the present invention, as described above, the spindle motor 1 is constituted by using the motor mounting concave portion 14, and the magnetic disk is provided in the first and second concave surface portions 11 and 12. 2 and magnetic head device 3
And the magnetic disk 2 and the magnetic head device 3
The thickness H _{2 of the} disk drive device according to the present invention, which is the height from the upper surface of the upper cover 35 to the bottom surface of the bulging portion 15 formed on the chassis 10 with the upper cover 35 attached so as to cover
Is set to 10 mm or less.

A first outer surface side concave surface portion 36 and a second outer surface side concave surface portion 36 are provided on the outer surface side of the chassis 10 constituting the main body of the apparatus opposite to the inner side surface on which the spindle motor 1 and the magnetic disk 2 are disposed. An outer side concave surface 37 is formed. The first outer surface-side concave surface portion 36 is formed on the side where the first concave surface portion 11 is formed, and extends around the bulging portion 15 where the motor mounting concave portion 14 is formed.
Is formed in a range extending to the other end portion 10b side of. The second outer surface side concave surface portion 37 is formed on the side where the second concave surface portion 12 is formed, and the chassis 10
Is formed in a range extending to the one end 10a side of the first portion. By the way, the first outer surface side concave surface portion 36 is the second concave surface portion 1.
2 is formed on the side of the first concave surface portion 11 which is shallower than that of the second outer surface side concave surface portion 37.

As shown in FIG. 4, a bulging portion 15 is provided at each corner on the outer side of the chassis 10 where the first and second outer side concave surfaces 36 and 37 are formed. Legs 110a, 110b, 1 that are approximately the same height as the tip surface of
10c and 110d are respectively protruded.

On the outer surface side of the chassis 10 where the first and second outer surface side concave surface portions 36 and 37 are formed, these outer surface side concave surface portions 36 and 37 and the first and second outer surface side concave surface portions 36 and 37 are formed. In order to increase the strength of the chassis 10 which is reduced in thickness by forming the concave surface portions 11 and 12, a reinforcing rib 71 is formed upright. This reinforcing rib 71
1.5 in the first and second outer side concave surface portions 36 and 37.
It is formed so as to form a lattice as a ridge having a height of about mm (see FIG. 3).

On the lower surface of the chassis 10 on which the first and second outer side concave surfaces 36 and 37 are formed, a printed circuit board 42 on which a control circuit for controlling the drive of the disk drive device is formed. Is attached. The printed circuit board 42 covers the substantially entire area of the first and second outer surface side concave surface portions 36 and 37 so as to cover the chassis 1.
0. An opening 43 is formed in a portion of the printed circuit board 42 corresponding to the bulging portion 15 so as to protrude the bulging portion 15. As shown in FIG. 4, the printed circuit board 42 projects the tip of the bulging portion 15 from the opening 43,
Leg pieces 110a, 11 formed on the lower surface side of chassis 10
Boss 45a, 45b, 45c, 45 having screw holes 44 planted near the inner sides of Ob, 110c, 110d.
d, and is attached to the lower surface side of the chassis 10 by a fixing screw 46 screwed into the screw hole 44.

Incidentally, the printed circuit board 42 is
As shown in the figure, the bosses 45a, 45b, 45c, 4
5d, mounting to the lower surface of the chassis 10 by a mounting height position regulating projection 46 protruding from the lower surface side of the chassis 10 and a supporting step 47 for supporting the peripheral edge of the opening 43 formed on the outer peripheral edge of the bulging portion 15. The height position is regulated. That is, the printed circuit board 42 accommodates electronic components mounted on the printed circuit board 42 between the bottom surface of the first outer surface side concave surface portion 36 and the bottom surface of the second outer surface side concave surface portion 37. Storage space 48, 49
Are arranged so as to be configured.

The chassis 1 of the printed circuit board 42
Boss part 4 that regulates the mounting height position with respect to the lower surface of 0
5a, 45b, 45c, 45d, the mounting height position regulating protrusion 46, and the support step 47 formed on the outer peripheral edge of the bulging portion 15, when the printed circuit board 42 is supported,
The printed circuit board 42 is connected to the leg pieces 110a, 110
b, 110c, and 110d. That is, the bosses 45a, 45b, 45c, 4
5d, mounting height position regulating protrusion 46 and support step 47
And the leg pieces 110 a, 110 b, 110 c, 110 d are formed such that the difference in height is greater than the thickness of the printed circuit board 42.

When the printed circuit board 42 is mounted on the lower surface side of the chassis 10 as described above, a storage space of about 3.0 mm is provided between the printed circuit board 42 and the bottom surface of the first outer side concave surface portion 36. 48, and a storage space 49 of about 1.9 mm is formed between the printed circuit board 42 and the bottom surface of the second outer surface side concave surface portion 27. This is because the first concave surface portion 11 formed facing the first outer surface side concave surface portion 36 is formed shallow, and the thickness of the chassis 10 is sufficiently ensured. This is because the depth of the concave surface portion 36 can be formed deeper than the depth of the second outer surface side concave surface portion 37.

As described above, the first outer surface side concave surface portion 3
The storage spaces 48 and 49 are configured using the second outer surface side concave surface portion 37 and the second outer surface side concave surface portion 37.
Electronic circuit components 101 such as an IC chip component, a coil, and a crystal oscillator mounted on the printed circuit board 42 by utilizing 8, 49 are housed and arranged.

The storage space 2 formed between the printed circuit board 42 and the bottom surface of the first outer surface side concave surface portion 36.
Since 5 is 3.0 mm, the electronic component 101 having a thickness of 2.9 mm or less is accommodated in the accommodation space 48.
The storage space 49 formed between the printed circuit board 42 and the bottom surface of the second outer surface side concave surface portion 37 is 1.9 m.
m, the electronic component 101 stored in the storage space 26 has a thickness of 1.85 mm or less.

At the other end on the lower surface side of the chassis 10 on which the printed circuit board 42 is disposed as described above, data recorded on the magnetic disk 2 by the magnetic head device 3 or reproduced from the magnetic disk 2 Printed circuit board 4
A connector 117 for transmitting and receiving a signal such as a control signal input to a control circuit unit configured on the control circuit 2 is attached. As shown in FIG. 3, the connector 117 is located at an end of the first outer surface side concave surface portion 36 and is housed and arranged in the housing space 48. In addition, the connector 11
7 is a 50-pin connector having 25 connector pins 117a arranged in two rows in order to enable connection compatible with various external devices. Further, the connector 117 has a width substantially equal to the width of the other end of the chassis 10. That is, the connector 117 is exposed over substantially the entire width of the other end of the chassis 10.

[0041]

As described above, according to the present invention, discs are provided in the first and second concave surfaces provided on the inner surface side of the chassis.
A drive motor, a recording / reproducing head, and a head arm drive motor are arranged, and electronic components are arranged in the first and second outer surface side concave surfaces provided on the outer surface side of the chassis. The concave portion provided on the inner surface side of the chassis is covered by the lid, and the concave surface portion on the outer surface side of the chassis is covered by the printed circuit board. In addition, the hermeticity of the space where each component is arranged can be ensured.

[Brief description of the drawings],

FIG. 1 is a schematic plan view showing the inside of a device main body of a conventional disk drive device.

FIG. 2 is a plan view showing the inside of the apparatus main body of the disk drive device according to the present invention.

FIG. 3 is a sectional view taken along the line IV-IV in FIG. 2;

FIG. 4 is a plan view showing an arrangement state of components mounted on an upper surface of a substrate with respect to a chassis.

[Explanation of symbols]

1 spindle motor, 2 magnetic disk, 3 magnetic head device, 4 head arm drive motor, 10
Chassis, 11 first concave surface portion, 12 second concave surface portion, 35 upper lid, 36 first outer surface side concave surface portion, 37 second outer surface side concave surface portion, 42 printed circuit board, 48, 49 storage space, 10 electronic circuit parts, memory card, 5 terminal for external connection, 9
Concave portion, 10 projecting portion, 11 shutter member, 20
Mounting device, 22 mounting recess, 23 connection terminal,
24 Sliding protrusion

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 33/12

Claims (1)

(57) [Claims] 1. A head arm having a drive motor for driving a disk to rotate at a substantially central portion of a chassis and having a recording / reproducing head for recording / reproducing an information signal to / from the disk is operated by rotating. In a disk drive device provided with a head arm drive motor for moving the recording / reproducing head in a radial direction of the disk at a corner portion on one end side of a chassis, the disk is provided in an inner surface area facing the disk. A first concave surface portion rotatably arranged is formed, and a second concave surface portion deeper than the first concave surface portion is formed in a region where the head arm moves and a region on the inner side surface where the head arm drive motor is disposed. Is formed, and a first outer surface side concave surface portion is formed in a region on the outer surface side facing the first concave surface portion, and an outer surface facing the second concave surface portion is formed. A second outer surface side concave surface portion having a depth smaller than that of the first outer surface side concave surface portion is formed in a side region, and the drive motor is disposed at a substantially central portion where the drive motor is disposed; A chassis having a bulging portion formed with a mounting recess formed on an outer surface side; a connector disposed at a second outer surface side concave surface portion at the other end of the chassis; Notch portions are formed to cover the first and second outer surface side concave surface portions and to be mounted on the outer surface side of the chassis, and to protrude a bulging portion formed with the motor mounting concave portion. A printed circuit board that forms a storage space between the outer surface side concave surface portion and the bottom surface of the printed circuit board and is mounted on the outer surface side of the chassis; Placed on the side facing the surface, A first electronic component having a first height corresponding to a storage space formed between the printed circuit board and the first outer surface side concave surface portion;
A second electronic component having a second height corresponding to a storage space formed between the printed circuit board and the second outer surface side concave surface portion, and a disk disposed on the inner surface side of the chassis; A disk drive device comprising: a drive motor; a recording / reproducing head; and a lid attached to the chassis so as to cover the head arm drive motor.