JPH05342730A - Disk chucking mechanism - Google Patents

Abstract

PURPOSE:To make a mechanism small-sized and to reduce the resistance of a mounting operation or a detaching operation of a disk on and from a disk table by installing a spherical member which protrudes to the outer direction of a fitting body when the disk table is turned. CONSTITUTION:A steel ball 13 as a spherical member is arranged inside a centering member 10 for a fitting body. It is guided by a spherical-body guide part 16 and protrudes to the outer circumferential direction of the centering member 10 by a centrifugal force which is generated by the rotary motion of a disk table 3. Thereby, the steel ball 3 comes into contact with the upper edge part of a center hole 2a in a disk 2; it presses the disk 2 to the side of the disk table 3; the disk 2 is held integrally by the disk table 3. In addition, when the disk table 3 is in a stop state, the steel ball 13 is pulled into the centering member 10 by means of a magnet or a slope which is installed on the centering member 16. Thereby, the disk 2 is separated easily from the disk table.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk table such that an optical disk, a magneto-optical disk or the like mounted on a disk table rotated by a rotary drive mechanism can be rotated integrally with the disk table. The present invention relates to a disk chucking mechanism for chucking a disk.

[0002]

2. Description of the Related Art Conventionally, various disk chucking mechanisms have been proposed for chucking a disk such as an optical disk on a disk table so that the disk can rotate integrally with the disk table.

As a disk chucking mechanism of this type, one having a disk retainer for holding a disk placed on the disk table in cooperation with the disk table is widely used. In this disc chucking mechanism, it is necessary to dispose the disc retainer so as to face the disc table, and hence the size of the mechanism itself cannot be avoided. That is, a member such as a support arm for bringing the disc holder into and out of contact with the disc table is required.

In order to solve the problem that the disc chucking mechanism becomes large in size by providing such a disc retainer, the applicant of the present application has decided to integrate the disc into the disc table without providing the disc retainer. As a possible disk chucking mechanism, the one disclosed in Japanese Patent Laid-Open No. 157859/1993 is proposed.

In the disk chucking mechanism described in this publication, as shown in FIGS. 9 and 10, a disk 41 integrally mounted on a spindle shaft 40a of a drive motor 40 constituting a rotary drive mechanism is mounted. Disc table 42 and a fitting body 4 which is arranged in the center of the disc table 42 and fits in the center hole 41a of the disc 41.
5 and a plurality of spherical members 47 which are arranged in the fitting body 45 so as to be able to move forward and backward and are urged in a direction projecting toward the outer peripheral direction of the fitting body 45 by an elastic member 46 made of a ring member such as synthetic rubber. It consists of and. 44
Is a lid of the disk drive device.

In this disk chucking mechanism,
When the center hole 41a of the disc 41 is fitted into the fitting body 45, as shown in FIG. 9, the inner peripheral surface of the center hole 41a causes each spherical member 47 to resist the biasing force of the elastic member 46. Moved towards the center of. In addition, the disc 41
10 is pressed onto the disc table 42, the plurality of spherical members 47 are pushed outward of the fitting body 45 by the biasing force of the elastic member 46 as shown in FIG. It contacts the upper edge portion 48. Then, the disc 41 is elastically pressed and supported on the disc table 42 side and integrally held on the disc table 42.

In the disk chucking mechanism constructed as described above, there is no need to provide a disk retainer that faces the disk table 42 and comes into contact with and separates from the disk table 42. Therefore, the height can be suppressed to reduce the size of the mechanism. Therefore, it is possible to reduce the size of the disk drive device using this disk chucking mechanism.

[0008]

However, the above-mentioned disc chucking mechanism is designed to fit the disc to the disc table by fitting the disc against the elastic member or the spring member. There is a problem that the resistance at the time of attachment / detachment becomes large, and the disc cannot be easily attached to or detached from the disc table.

Further, since an elastic member for projecting the spherical member outward of the fitting body is necessary, there is a problem that the mechanism becomes complicated.

Therefore, according to the present invention, the structure utilizing the centrifugal force of the rotationally driven disk table makes it possible to reduce the resistance of the disk attachment / detachment and to further simplify the structure. Is to provide.

[0011]

In order to achieve the above-mentioned object, a disk chucking mechanism according to the present invention is a disk on which a disk having a central hole is placed and which is rotationally operated by a rotary drive mechanism. A table, a cylindrical fitting body disposed in the center of the disc table and fitted into the center hole of the disc, and a spherical body guide portion formed from the outer peripheral side of the fitting body toward the center. A spherical member that is disposed in the fitting body, is guided by a spherical body guide portion by the rotation of the disc table, and protrudes outward of the fitting body.

Furthermore, a returning means for returning the spherical body projected from the fitting body to the inside of the fitting body is provided.

[0013]

In the disk chucking mechanism according to the present invention, the spherical member arranged in the fitting body is guided by the spherical body guide portion by the centrifugal force generated by the rotational driving of the disk table and protrudes in the outer peripheral direction of the fitting body. Then, the disk comes into contact with the upper edge of the center hole of the disk to press and support the disk on the disk table side.

Further, when the disk table is in a stopped state, the spherical member is guided by the spherical body guide portion by the returning means constituted by the magnet and the inclined surface and is drawn inward of the fitting body.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 to 3, the disc chucking mechanism according to the present invention integrally fits a disc table 3 on which a disc 2 is placed on a spindle shaft 1a of a drive motor 1 constituting a rotary drive mechanism. It will be configured.

As shown in FIG. 5, the drive motor 1 is attached to a motor support plate 4 which constitutes a disk drive device using this disk chucking mechanism by a plurality of setscrews 5, and the disk drive device described above. It is arranged inside the outer casing 6. The motor support plate 4
Since it is difficult for vibrations and impacts from the outside of the outer casing 6 to be transmitted to the drive motor 1, a plurality of cushioning members 8 made of rubber, springs or the like are attached to the chassis 7 provided in the outer casing 6. By virtue of the interposition, it is supported in a so-called floating state.

The motor support plate 4 is provided with information signal recording and / or reproducing means such as an optical pickup device for recording and / or reproducing information signals on the disk 2.

As shown in FIG. 1, the disk table 3 is integrally formed of a synthetic resin molded body or the like,
Fitting cylinder part 3a formed in a substantially cylindrical shape, and this fitting cylinder part 3
A mounting plate portion 3b having a substantially disk shape and provided in a flange shape is provided on the outer peripheral side of the lower end side which is the drive motor 1 side of a.
A shaft fitting hole 3c into which the spindle shaft 1a of the drive motor 1 is fitted is provided at the center of the fitting cylindrical portion 3a. Further, a disc contact portion 3d formed of an annular protrusion is provided on the peripheral edge side of the upper surface of the placing plate portion 3b.

Incidentally, on the inner peripheral surface side of the shaft fitting hole 3c,
In order to ensure the support of the disk table 3 by the spindle shaft 1a, a support ring 9 made of metal is disposed between the spindle 1a and the support ring 9. The support ring 9 is attached to the disc table 3 by means such as so-called insert molding.

Then, on the upper end side of the fitting cylinder portion 3a located on the tip end side of the spindle shaft 1a, as shown in FIGS. 1 to 3, a substantially cylindrical fitting for fitting in the center hole 2a of the disk 2 is carried out. A centering member 10 as a unit is attached.
The centering member 10 includes a cap portion 11 which is a fitting portion fitted into a central hole 2a for chucking provided in a central portion of the disk 2, and a plurality of spherical shapes housed and arranged in the cap portion 11. It is composed of three magnetic steel balls 13 which are members.

The cap portion 11 is integrally formed of a material such as synthetic resin, and is provided on the upper end side of the support portion 11a fitted to the outer peripheral side of the spindle shaft 3a of the disk table 3. A top plate portion 11b provided in a flange shape and a side wall portion 11c provided so as to hang down from the outer peripheral edge of the top plate portion 11b toward the disc table 3 side. It is formed in a truncated cone shape.

The cap portion 11 is formed such that the diameter of the outer peripheral surface on the lower end side of the side wall portion 11c on the side of the disc table 3 shown by arrow D ₁ in FIG. 4 is slightly smaller than the diameter of the central hole 2a of the disc 2. ing. In addition, the side wall portion 11c
A flange portion 11d is provided on the outer peripheral side on the lower end side of the.

Further, the cap portion 11 has a top plate portion 11b.
Further, three pairs of notches 14 are provided at intervals of approximately 120 ° across the side wall 11c and the flange 11d.
A displacement portion 15 which is elastically deformable in a contacting / separating direction with respect to the support portion 11a is provided between the pair of cut portions 14, 14.
Has been done. In these displacement portions 15, the diameter of the circumscribed circle including the outer peripheral surface of the portion corresponding to the lower end side of the side wall portion 11c is
The diameter is formed to be slightly larger than the center hole 2a of the disc 2.

When the cap portion 11 is attached to the disc table 3, the flange portion 11d is placed on the mounting plate portion 3b.
It is adapted to be fitted in an annular groove portion 3e provided on the upper surface side of the. Therefore, each of the displacement portions 15 can be displaced within a range in which the tip end side forming a part of the flange portion 11d is fitted into the groove portion 3e and the tip end side moves in the groove portion 3e.

As shown in FIGS. 1 to 4, the cap portion 11 has a spherical shape for guiding the movement of the steel ball 13 disposed in the cap portion 13 along the inner and outer circumferences of the cap portion 11. A body guide portion 16 is provided. The spherical body guide portions 16 are provided at approximately 120 ° intervals from the outer circumference of the cap portion 11 serving as the fitting body 10 toward the central portion. The steel balls 13 are arranged so as to be partially engaged with the spherical body guide portions 16 so as to be guided by the spherical body guide portions 16 and movable in the cap portion 11. ing.

Guide grooves 16a and 16b are formed on the bottom surface and the top surface of each spherical body guide portion 16 to guide the moving direction of the steel ball 13. Further, the engaging portion 17 is provided on the flange portion 11d of the cap portion 11 which is the outer peripheral end of the guide groove 16a on the bottom surface side of each spherical body guide portion 16.
Are formed. Each of these locking portions 17 is the steel ball 1 described above.
3 is to prevent the cap portion 11 from falling off.

The steel balls 13 arranged in this manner are projected through the opening 18 of the spherical body guide portion 16 to the outside of the side wall portion 11c of the cap portion 11 by about 30% to 50% of the diameter. It is designed to be. At this time, the diameter of the circumscribed circle of each of the steel balls 13 including the portion formed on the outer side of the steel balls 13 shown by the arrow D ₂ in FIG. 4 is larger than that of the central hole 2a of the disc 2. It is done like this.

The steel balls 13 are used for the drive motor 1
At the time of stopping, as shown in FIG.
It is placed so that it can move freely inside.

The spherical body guide portion 16 has a steel ball 13
The return mechanism is formed. As shown in FIG. 6, this return mechanism is provided with a guide groove 16 on the bottom surface side of the spherical body guide portion 16.
a, from the outer peripheral side of the cap portion 11 toward the central portion,
It is configured by providing an inclined surface portion that is gradually inclined. By thus forming the guide groove 16a on the bottom surface side as the inclined surface portion, when the drive motor 1 is stopped and the disc table 3 is not rotationally driven, each steel ball 13 is placed inside the cap portion 11. It is placed in the state of being pulled back to.

Further, as shown in FIG. 7, the mechanism for returning the steel balls 13 is to dispose a magnet 19 for magnetically attracting the steel balls 13 made of a magnetic material in the innermost part 16e of the spherical body guide portion 16. It may be configured by. That is, when the drive motor 1 is in the stopped state and the disc table 3 is not rotationally driven, the steel balls 13 are attracted by the magnets 19 and are retracted back inside the cap portion 11. The magnet 19 has a magnetic attraction force sufficient to separate the steel balls 13 by the centrifugal force of the disk table 3 when the disk table 3 is rotationally driven.

As shown in FIG. 5, a lid 20 that opens and closes an opening of the outer casing 6 is rotatably supported by the outer casing 6 of the disk drive device via a support shaft 20a. Installed.

In the disk chucking mechanism according to the present invention constructed as described above, in order to mount the disk 2 on the disk table 3, the center hole 2a of the disk 2 to be mounted is fitted into the centering member 10. used.

That is, the center hole 2a of the disk 2 is fitted into the centering member 10, but in this case, since each steel ball 13 is in the state of being pulled back inward of the cap portion 11, FIG. As shown, the disc 2 can be easily placed on the disc table 3 without resistance.

When the drive motor 1 is driven to rotate the disk table 3 while the disk 2 is placed on the disk table 3, the steel balls receive the centrifugal force generated by the rotation of the disk table 3. 13 is guided by the guide grooves 16a and 16b of the spherical body guide portion 16 to be moved outward, and protrudes to the outside of the side wall portion 11c of the cap portion 11 through the opening 18.

The disc 2 placed on the disc table 3 has the side wall 1 of the steel ball 13 protruding outward from the side wall 11c of the cap 11 through the opening 18.
The portion protruding outward from 1c and the disc table 3
It will be located between and. At this time, the steel ball 13
Contacts the upper edge of the center hole 2a of the disk 2,
The disk 2 is pressed and supported by the disk table 3 side, and is integrated with the disk table 3 to be rotationally driven.

On the other hand, when the driving of the drive motor 1 for rotating the disk table 3 is stopped, the centrifugal force is lost and the steel ball 13 is guided by the spherical body guide portion 16 and returned to the inside of the cap portion 11. .. At this time, by providing the spherical body guide portion 16 with a returning mechanism including the inclined surface portion or the magnet 19, the steel ball 13 is maintained in a state of being pulled back inward of the cap portion 11, so that the disc 2 Disc table 3 as easily as when mounting
It is possible to remove from.

In the disk drive device using the disk chucking mechanism according to the present invention, as shown in FIG. 8, it is possible to form the lid 20 constituting the disk drive device into a flat plate shape. Yes, again
On the upper surface side of the lid 20, various display devices 21, switches, push button devices 22 and the like can be easily attached to the central portion corresponding to the position of the disc table 3.

Further, the disc chucking mechanism according to the present invention is not limited to the above-mentioned embodiment, and may be constituted by using, for example, four or more steel balls 13. In this case, the spherical body guide portion 16 is provided with the steel balls 1
Corresponding to item 3, it should be provided in 4 or more places. Further, the displacement portion 15 may be provided at four or more places.

[0039]

According to the present invention, the centrifugal force generated by the rotation of the disc table is utilized to move the steel ball forward and backward to chuck the disc. The resistance can be remarkably reduced, and the disc can be easily loaded and unloaded. Further, since the load for loading / unloading the disk on / from the disk table is reduced, damage to the disk can be surely prevented.

Furthermore, since an elastic member or the like is not required to chuck the disc on the disc table,
By reducing the number of parts, the mechanism can be simplified and downsized, and by extension, the disk drive device using the disk chucking mechanism can be downsized.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a main part of a disk chucking mechanism according to the present invention.

FIG. 2 is a longitudinal sectional view showing a state where a disc is placed on a disc table.

FIG. 3 is a longitudinal sectional view showing a state where the disc table is in a rotationally driven state and the disc is supported by a spherical member.

FIG. 4 is an enlarged plan view showing a disk chucking mechanism according to the present invention.

FIG. 5 is an exploded perspective view showing a disk drive device configured using a disk chucking mechanism according to the present invention.

FIG. 6 is a vertical sectional view showing a returning mechanism of a spherical member of the disk chucking mechanism according to the present invention.

FIG. 7 is a vertical sectional view showing another example of the returning mechanism of the spherical member.

FIG. 8 is a perspective view showing an external appearance of a disk device configured using the disk chucking mechanism according to the present invention.

FIG. 9 is a vertical sectional view showing a conventional disk chucking mechanism, showing a state in which a disk is placed on a disk table.

FIG. 10 is a vertical cross-sectional view showing a state where a disk is chucked by a conventional disk chucking mechanism.

[Explanation of symbols]

 1 Drive Motor 2 Disc 2a Center Hole of Disc 3 Disc Table 10 Centering Member 11 Centering Cap 13 Steel Ball 16 Spherical Body Guide 19 Magnet

Claims (4)

[Claims] 1. A disk table on which a disk having a center hole is placed and which is rotationally operated by a rotary drive mechanism, and a cylindrical shape which is disposed at the center of the disk table and fits into the center hole of the disk. The fitting body to be formed, a spherical body guide portion formed from the outer peripheral side of the fitting body toward the center, and arranged in the fitting body, and guided by the spherical body guide portion by the rotation of the disc table. A disk chucking mechanism comprising a spherical member protruding outward of the fitting body. 2. The disk chucking mechanism according to claim 1, further comprising return means for returning the spherical member into the fitting body. 3. The disk chucking mechanism according to claim 2, wherein the returning means comprises a magnet disposed inside the fitting body. 4. The disc chucking mechanism according to claim 2, wherein the returning means is configured by providing the spherical body guide portion with an inclined surface portion inclined from the outer peripheral side of the fitting body toward the central portion.