JPH06139676A - Disk driving device - Google Patents

Abstract

PURPOSE:To make the disk driving device thin in thickness in simple structure without possibility of flawing a hard case even when the hard case is brought into contact with a spherical body at the time of inserting a disk. CONSTITUTION:A spindle 63 is provided with a through hole 67 to open upward, and the spherical body 68 is freely rotatably housed in this through hole 67, and also the spherical body 68 is restrained from pulling out, so as to be partly protruding out of the opening. Since a conical coil spring 70 for energizing upward the spherical body 68 is provided in the through hole 67, even when the hard case is brought into contact with the spindle (center shaft) 63 (spherical body 68) on impact at the time of loading the disk, the spherical body 68 is pushed down against the conical coil spring 70 to buffer the impact, and hence no strong pressure takes place between the spindle 63 (spherical body 68) and the hard case. Moreover, since the spherical body 68 can be rotated, even when the center shaft and a disk cartridge 66 are brought into contact with each other, the disk cartridge is difficult to be flawed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive device, and more particularly to a disk drive device for chucking and setting a magnetic recording medium.

[0002]

2. Description of the Related Art FIG. 5 is an explanatory diagram showing a disk drive device used as an external storage device such as a personal computer or a word processor. In this figure, 1 is a disk drive motor, and a spindle hub 3 is attached to a spindle shaft 2 of the disk drive motor 1. A center pin 4 and a drive pin (not shown), which are the tip end portions of the spindle shaft 2, are provided on the upper surface of the spindle hub 3 so as to project therefrom. Although not shown, the disk housed in the hard case is inserted into the cartridge holder. When the disc is completely inserted into the cartridge holder, the cartridge holder descends while holding the disc and places the disc on the spindle hub 3.
In this mounted state, the center pin hole of the disc (not shown)
Is fitted in the center pin 4, and a drive pin hole (not shown) of the disc is fitted in the drive pin. By the way, in recent years, portable personal computers and word processors are so-called laptop type, which is widely used, and there is an extremely high demand for miniaturization and thinning of these devices. For this reason, thinning is also required for the disk drive device mounted in these devices, and various devices have been proposed.

For example, there is Japanese Patent Laid-Open No. 4-105257, which is shown in FIG. FIG. 6 is an explanatory diagram showing a main part of a second conventional disk drive device. In this figure, 1
Reference numeral 0 is a disk drive motor, 11 is a device frame, and a motor frame 12 is attached to the device frame 11. The motor frame 12 has a rotating shaft 1 through bearings 13 and 13.
4, a spindle hub 17 on a disk is attached to a flange 14a at the upper end of the rotary shaft 14 by a screw via a support portion. Through holes 18 and 19 are formed near the center and outer periphery of the spindle hub 17. A leaf spring 20 as an elastic member is attached to the lower surface of the spindle hub 17 by, for example, a pin 21 via an attachment hole, and a center pin 23 and a drive pin 24 are attached to the leaf spring 20 by pin holes 25 and 26, respectively. The center pin 23 is fixed through the through hole 18, and the drive pin 24 is elastically projected through the through hole 19 upward. The leaf spring 20 is provided with a cut-and-raised piece 29 for supporting the center pin 23 at the center, and an insertion hole for inserting the supporting portion is formed. The operation of the conventional disk drive device thus configured will be described. During the disk insertion operation, the drive pin 24 and the center pin 23 of the disk drive motor 10 come into contact with and are pressed by the lower surface of the hard case of the disk, and the leaf spring 20 bends accordingly, and the disk insertion operation is performed. Next, in order to take out the loaded disc, first, when the eject button 32 is pressed, the eject plate moves in the depth direction, the guide pin moves to the upper part of the inclined hole along the vertical hole, and the cartridge holder rises, Similarly, the support part of the loading mechanism lifts the lifting part of the movable arm. As a result, the center pin hole and the drive pin hole of the disk are separated from the center pin 23 and the drive pin 24, respectively. On the other hand, the hop-up plate is unlocked by the movement of the eject plate in the depth direction, and the hop-up plate is moved forward (outlet side) by the ejection spring to push the disc out of the cartridge holder, and the disc is unloaded. .

Further, there is Japanese Patent Laid-Open No. 62-226469, which is shown in FIGS. 7 and 8. FIG. 7 is an explanatory diagram showing a state of the third conventional disk drive device during chucking, and FIG. 8 is an explanatory diagram showing a state of the third conventional disk drive device before chucking. In the conventional example shown in FIGS. 7 and 8, first, when the disk cartridge 5 is inserted into the insertion position in the drive device, the spindle 41 is driven by the motor 40. Therefore, together with the spindle 41, the positioning shaft assembly 42 and the rotating shaft assembly 42 are rotated. The transmission pin 43 is also rotated. When the disc cartridge 5 is inserted, as shown in FIG. 8, the push-in lever 44 operates in the direction of arrow A,
The positioning shaft assembly 42 is attached to the disc cartridge 5
Since it is pushed toward the disc 6 direction, as shown in FIG.
The positioning shaft assembly 42 is used for the center hole 6 of the disk 6.
Fit a. As a result, the disc 6 is positioned at the insertion position. At that time, the rotation transmission pin 4 that moves in the same direction and synchronously with the positioning shaft assembly 42.
Since 3 is fixed, when the rotation transmission pin 43 also rotates and coincides with the rotation transmission hole 6b of the disk 6, it fits into the rotation transmission hole 6b. As a result, the drive force of the spindle 41 is transmitted to the disc 6 via the rotation transmission pin 43, so that the disc 6 is moved to the positioning shaft assembly 4
Rotate around 2. Further, when the rotation transmitting pin 43 is fitted, the suction member 45 fixed to the positioning shaft assembly 42 moves to the tip end portion of the spindle 41 and sucks the disk 6 onto the spindle 41, so that the disk 6 is rotating. Firmly held in place.

Also, there is Japanese Utility Model Laid-Open No. 2-72455, which is shown in FIGS. 9 and 10. FIG. 9 is an explanatory view showing a main part of a fourth conventional disk drive device, and FIG. 10 is an explanatory view showing an enlarged drive pin portion of the disk drive device of FIG. In the conventional disk drive device shown in FIGS. 9 and 10, when the disk 6 is attracted by the magnet 46 and chucked, the drive pin 48 that rotates together with the spindle shaft 47 is attached to the disk hub by the magnet 46. It has a structure having a ball 50 whose tip that contacts the surface of 49 rotates freely.

[0006]

By the way, in the second conventional example, since the center pin 23 is attached to the cut-and-raised piece 29 of the leaf spring 20, the lower surface of the hard case of the disk during the disk insertion operation. Touch the center pin 23
Is pushed and the leaf spring 20 bends accordingly, but the amount of lowering of the center pin 23 is not sufficient, and there is a possibility that the hard case may be damaged by the sliding of the lower surface of the hard case of the disk and the center pin 23. .

The third conventional example requires parts such as the positioning shaft assembly 42 for driving the rotation transmitting pin 43 and the like, and requires drive control, which complicates the apparatus.

In the fourth conventional example, the drive pin 48 is
It has a ball 50 whose tip that comes into contact with the surface of the disk hub 49 is freely rotatable and does not contribute to any reduction in thickness.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has been made in order to solve the problem. An object of the present invention is to damage the hard case even if the hard case and the sphere come into contact with each other when the disk is inserted. It has a simple structure and can be made thinner, and there is no need to machine the SR shape at the tip of the spindle shaft.
The cost can be reduced, and the spherical body urges the warping of the hard case upward by a biasing member when mounting the disc, similar to the conventional spindle axis, and the crushing of the center pin receiving part of the disc due to the impact during mounting is small and long. (EN) It is an object to provide a disk drive device that has a long life.

[0010]

To achieve the above object, the present invention provides a spindle shaft fitted to a central hub of a recording medium, a drive pin engaging a positioning hole of the hub, and the disk. In a disk drive device including a magnet that attracts and chucks a hub, the spindle shaft has a hole that opens upward,
A structure in which a sphere is rotatably accommodated in this hole, the sphere is prevented from coming off so as to partially project from the opening, and an urging member for urging the sphere upward is provided in the hole. I am doing it.

[0011]

With the above-mentioned means, the spindle shaft is provided with a hole opening upward, and the sphere is rotatably accommodated in the hole, and the sphere is prevented from coming off from the opening, and the sphere is held in the hole. Since the biasing member that biases upward is provided, even if the hard case comes into contact with the center shaft due to the shock when the disc is mounted, the sphere is pushed down against the biasing means to buffer the shock, Since a strong pressure is not generated between the center shaft (sphere) and the hard case and the sphere rotates, there is no risk of scratching the hard case. Also,
Since the sphere can be pushed down, it can be made thin with a simple structure. In addition, the spindle shaft has a hole that opens upwards,
Since the sphere is rotatably housed in this hole and the sphere is prevented from coming off so as to project from the opening,
It is not necessary to process the SR shape at the tip of the spindle shaft. In addition, the spindle shaft is provided with a hole that opens upward, and the sphere is rotatably accommodated in this hole, and the sphere is retained so as to project from the opening, and the sphere is located above the hole. Since the urging member for urging the hard disk is provided, the spherical body corrects the warp of the hard case upward by the urging member when the disc is mounted, like the conventional spindle shaft.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. 1 to 3 are for explaining a first embodiment of a disk drive device according to the present invention.
2 is an explanatory diagram showing a disc unmounted state in the first embodiment, FIG. 2 is an explanatory diagram showing a disc mounting state in the first embodiment, and FIG. 3 is an explanatory diagram showing a disc mounting completed state in the first embodiment. .

In these figures, 60 is a yoke and 61
Is a bearing fitted in the through hole 62 of the yoke 60, 63 is a spindle shaft supported by the bearing, and 64 is a spindle shaft 63.
Fixed to the rotor, 65 is the yoke 60 and the rotor 6
A thrust bearing 66 is interposed between the bearings 4 and 6, and a disc cartridge 66 accommodates a disc. A through hole 67 is formed in the spindle shaft 63 to have a cylindrical shape, and a sphere 68 is housed in the through hole 67. The inner diameter of the through hole 67 is the upper opening edge portion 69 of the through hole 67.
The inner diameter is small so that the sphere 68 in the through hole 67 does not come out as shown in FIG. Reference numeral 70 denotes a conical coil spring which is a biasing means.
The small diameter portion of 0 is in contact with the sphere 68, and the large diameter portion is the through hole 67.
It is arranged so as to be engaged with an annular groove 71 formed near the lower opening edge. This conical coil spring 70 allows a sphere 68
Is urged upward. Reference numeral 75 is a disk, 76 is a hub, and 77 is a center hole. Although not shown,
A chucking magnet, a drive pin, and the like are arranged on the rotor 64 as in the above-described conventional example.

Next, the operation of the first embodiment will be described. When the disc is not mounted as shown in FIG. 1, the spherical body 68 is urged upward by the conical coil spring 70 to move the spindle shaft 63.
The sphere 68 is pressed against the upper opening edge portion 69, and part of the sphere 68 projects from the spindle shaft 63. From this state, the disc cartridge 66 is inserted into a cartridge holder (not shown). In this embodiment, the cartridge holder is set so that the lower surface of the cartridge holder is slightly above the upper end of the spindle shaft 63 when the cartridge holder is inserted. Therefore, the inserted cartridge holder collides with the spherical body 68 protruding from the spindle shaft 63, and the spherical body is pushed against the conical coil spring 70 by the cartridge holder, and the spherical body 68 is pushed down into the spindle shaft 63 as shown in FIG. To be When the disc cartridge 66 is inserted into the cartridge holder, the cartridge holder is lowered by the known cam mechanism to the loading position shown in FIG. In this state, the hub 76 of the disc cartridge 66 is placed on the turntable (rotor), and the center hole 77 of the hub 76 is fitted to the spindle shaft 63. Therefore, the sphere 68 housed in the Svindle shaft 63 is
The upper part of the sphere 68 is projected by the conical coil spring 70. Further, when the disc cartridge 66 is ejected, when the disc cartridge 66 is ejected from the cartridge holder which is raised from the loading position and is located at the unloading position, the sphere 68 becomes a conical coil spring by the disc cartridge as in the insertion. The disk cartridge 66 is pushed down against and is smoothly ejected. According to the first embodiment thus configured, the spindle shaft 63 has the through hole 67 that opens upward.
The sphere 68 is rotatably accommodated in the through hole 67, and the sphere 68 is prevented from coming off so that a part of the sphere 68 projects from the opening, and a cone that urges the sphere 68 upward in the through hole 67. Since the coil spring 70 is provided, even if the center shaft and the disc cartridge 66 come into contact with each other, the disc cartridge 66 is not easily scratched and the center shaft can be easily processed. Further, since the sphere 68 is rotatably housed in the through hole 67 of the spindle shaft 63 and the sphere 68 is prevented from coming off so as to project from the upper opening, it is not necessary to process the SR shape of the tip of the spindle shaft. Cost reduction can be achieved. Further, when the disk is mounted, the spherical body 68 corrects the warp of the hard case upward by the conical coil spring 70 like the conventional spindle shaft, and the center pin receiving portion of the disk is not crushed due to the shock at the time of mounting, and the life can be extended. .

FIG. 4 is an explanatory view showing a state in which the disc is not mounted in the second embodiment of the disc drive device according to the present invention. The same parts as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted. The second embodiment is different from the first embodiment in that the conical coil spring of the first embodiment is replaced by a leaf spring 72 as an urging member. This leaf spring 72 is formed in a shape similar to an S-shape, one end 73 of which is fitted into the annular groove 71, and the other end 74 of which extends upward to form a free end. It is in contact with 68. The leaf spring 72 biases the sphere 68 upward as in the first embodiment. Even in the second embodiment configured as described above, the same operational effects as the operational effects produced by the first embodiment can be obtained.

[0016]

As described above, according to the present invention,
A disk drive device comprising a spindle shaft fitted to a central hub of a recording medium, a drive pin engaged with a positioning hole of the hub, and a magnet for attracting and chucking the disk hub. Is provided with a hole opening upward, and the sphere is rotatably accommodated in the hole, and the sphere is prevented from coming off so as to partially project from the opening. Since the biasing member for biasing is provided, even if the hard case and the spherical body come into contact with each other when the disc is inserted, there is no fear of damaging the hard case, and a thin structure can be achieved with a simple structure. Further, the spindle shaft is provided with a hole that opens upward, and the sphere is rotatably accommodated in this hole, and the sphere is prevented from coming off so as to project from the opening. The processing is unnecessary, and the cost can be reduced. Further, when the disc is mounted, the spherical body corrects the warp of the hard case upward by the biasing member similarly to the conventional spindle shaft, and the center pin receiving portion of the disc is less crushed due to the impact at the time of mounting, so that the life can be extended.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a disk unmounted state in a first embodiment of a disk drive device according to the present invention.

FIG. 2 is an explanatory diagram showing a state where a disc is being mounted in the disc drive device according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a disk mounting completion state in the first embodiment of the disk drive device according to the present invention.

FIG. 4 is an explanatory view showing a disc unmounted state in the second embodiment of the disc driving device according to the present invention.

FIG. 5 is an explanatory diagram showing a main part of a first conventional disk drive device.

FIG. 6 is an explanatory diagram showing a main part of a second conventional disk drive device.

FIG. 7 is an explanatory diagram showing a state of a third conventional disk drive device at the time of chucking.

FIG. 8 is an explanatory diagram showing a state before chucking of a third conventional disk drive device.

FIG. 9 is an explanatory diagram showing a main part of a fourth conventional disk drive device.

10 is an explanatory diagram showing an enlarged drive pin portion of the disk drive device of FIG. 9. FIG.

[Explanation of symbols]

 60 Yoke 61 Bearing 62 Through Hole 63 Spindle Shaft 64 Rotor 66 Disk Cartridge 67 Through Hole 68 Sphere 69 Upper Opening Edge 70 Conical Coil Spring 71 Annular Groove 72 Leaf Spring 73 One End 74 The Other End

Claims (1)

[Claims] 1. A disk drive device comprising a spindle shaft fitted to a central hub of a recording medium, a drive pin engaged with a positioning hole of the hub, and a magnet for attracting and chucking the disk hub. In, the spindle shaft is provided with a hole opening upward,
The sphere is rotatably housed in the hole, the sphere is prevented from coming off so as to partially project from the opening, and the urging member for urging the sphere upward is provided in the hole. A disk drive device characterized by.