JPH05282824A - Clamping hub device of disk - Google Patents

Abstract

PURPOSE:To mount a disk provided with only a center hole made therein and equipped with no attracting means for a disk table on a disk rotation drive mechanism, on which a disk fitted with a clamping hub is mounted. CONSTITUTION:In a clamping hub 11, a hub body 12 is fitted into the center hole 2 of a disk 3 while a flange part 14 is engageably mounted on one principal plane side of the disk 3, and a freely removable fixing member 17 is engage- arranged on the tip side outer peripheral part of the hub body 12 protruding to the other principal plane side of the disk 3 so that the disk 3 is held between and mounted by the fixing member 17 and flange part 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clamping hub device used for an information signal recording disk such as an optical disk or a magneto-optical disk for recording a desired information signal.
In particular, the present invention relates to a device that can be detachably attached to a disc.

[0002]

2. Description of the Related Art Conventionally, discs for recording information signals, such as optical discs and magneto-optical discs, on which desired information signals are recorded have been proposed. Among optical discs of this type, a disc substrate formed by molding a synthetic resin material such as polycarbonate resin and having only a center hole is widely used. An optical disc constructed by forming a center hole in the disc substrate is used for centering the center hole with respect to the center of rotation of the disc table when mounted on the disc table of the disc rotation drive mechanism. Then, the center hole is engaged with the centering member provided in the central portion of the disc table and placed on the disc table, whereby the disc table is centered and mounted.

Since this optical disk is only placed on the disk table by engaging the center hole with the centering member, it is surely integrated with the disk table when it is rotated at a high speed. There is a possibility that the rotation may not be accurately synchronized with.

Therefore, in a recording and / or reproducing apparatus using an optical disc having only a center hole as a recording medium, a clamp for clamping the optical disc mounted on the disc table in cooperation with the disc table. The members are provided. By providing the clamp member in this manner, the optical disk can be reliably integrated with the disk table and can be rotationally driven in synchronization with the rotation of the disk table even when rotated at high speed. Becomes

Even in the case of the optical disc having only the center hole as described above, the optical disc is accurately synchronized with the rotation of the disc table by providing the disc rotation driving mechanism side with the disc table and the clamp member for sandwiching the optical disc. However, since the clamp member is provided so as to face the disk table, the size of the disk rotation drive mechanism is increased, and thus the size of the recording and / or reproducing apparatus is increased. ..

Therefore, the recording and / or reproducing apparatus is surely integrated with the disk table of the disk rotation driving apparatus without providing a clamp member on the recording and / or reproducing apparatus side, and mounted so that the disk table can be rotationally driven accurately in synchronization with the rotation. Possible optical disks have been proposed.

This optical disk has a clamp hub formed of a metal plate made of a magnetic material and attached to a portion corresponding to the center hole of the disk substrate. This optical disk is integrated with the disk table by the magnetic attraction of the clamp hub by the magnet arranged on the disk table side that constitutes the disk rotation drive mechanism, and is synchronized with the rotation of the disk table accurately. It is mounted so that it can be rotationally driven.

Further, in an optical disk having a clamping hub attached, a spindle engaging hole with which the tip of a spindle shaft protruding from the central portion of the disk table engages is formed in the central portion of the clamping hub. There has also been proposed a structure in which a spindle shaft is engaged with the spindle engagement hole so that the disc table can be mounted while being accurately centered on the rotation center of the disc table.

[0009]

By the way, in a recording and / or reproducing apparatus using an optical disk as a recording medium, a read-only type optical disk used only for reproducing a prerecorded information signal, and a once-recorded optical disk are used. It has been proposed to use both a re-recordable optical disc such as a magneto-optical disc capable of erasing an information signal and re-recording a new information signal as a recording medium.

As the read-only type optical disc, a disc substrate having only a center hole is widely used as described above. Further, as a magneto-optical disk capable of re-recording an information signal, a magneto-optical disk in which a clamping hub made of a magnetic material such as a metal plate is attached to a portion corresponding to a center hole of a disk substrate has been proposed.

However, the optical disk having only the center hole cannot be rotationally driven by mounting the optical disk having the clamping hub on the disk rotation drive mechanism. That is, the optical disk provided with only the center hole does not include means for being integrally supported on the disk table by being sucked by the disk rotation drive mechanism, and therefore cannot be integrated with the disk table. This is because it cannot be driven to rotate precisely in synchronization with the rotation.

Therefore, according to the present invention, even a disc having only the center hole and no attracted means for the disc table is attached to the disc rotation drive mechanism to which the disc having the clamp hub is attached. The present invention has been proposed for the purpose of enabling a disc having no clamping hub and a disc having a clamping hub to be used interchangeably.

[0013]

In order to achieve the above-mentioned object, a disk clamping hub device according to the present invention has a hub body fitted in a center hole of the disk and a base end side of the hub body. Is formed on the outer peripheral surface of the hub main body so as to be reduced in diameter from the base end side on which the flange portion is provided to the tip end side. A clamping hub having a slanted surface portion, and a detachable engagement arrangement with a distal end side outer peripheral portion of the hub body that is fitted into the center hole of the disc and projects toward the other main surface side of the disc, It is constituted by a fixing member which holds the disc together with the flange portion and fixedly supports the clamping hub with respect to the disc.

[0014]

The clamp hub constituting the disk clamp hub device according to the present invention is such that the hub body is fitted in the center hole of the disk and the flange portion is locked to one main surface side of the disk. Be attached to. The hub mounted on this disc is fixed by disposing a fixing member that is detachably engaged with the outer periphery of the hub body protruding toward the other main surface side of the disc. The disc is sandwiched and attached by the member and the flange portion.

When the fixing member is engaged with the outer peripheral portion of the hub body on the tip side, the clamping hub is drawn so as to further project to the other main surface side of the disk from which the tip side of the hub body projects. The inclined surface part formed on the outer peripheral surface of the hub body is brought into contact with the peripheral edge on one end side of the center hole, the error between the outer peripheral diameter of the hub body and the inner peripheral diameter of the center hole is absorbed, and the disc is closely attached. Be done.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. The disc clamping hub device according to the present invention is applied to a disc that does not include a clamping hub on the disc itself, and is formed of a synthetic resin material such as a polycarbonate resin as shown in FIG. It is applied to the optical disc 3 in which only the center hole 2 is formed in the disc substrate 1 thus formed.

The clamp hub device 10 according to the present invention comprises:
The clamping hub 11 is formed by punching and bending a magnetic metal plate such as a stainless plate. As shown in FIGS. 1 and 2, the clamping hub 11 has a hub body 12 that fits into the center hole 2 provided in the optical disc 3.

When the hub body 12 is fitted into the center hole 2, the main surface 1a of the disk substrate 1 is fitted around the outer circumference of the base end side opposite to the tip end side having the bottom portion 13 of the hub body 12. The flange portion 14 that is locked to the peripheral edge of the center hole 2 on the side is bent and formed. This flange part 14
Is formed in such a size that the hub body 12 can be securely locked to the peripheral edge of the center hole 2 when the hub body 12 is fitted in the center hole 2. ₁
It is formed with a sufficiently larger outer peripheral diameter r ₂ .

The flange portion 14 is provided as shown in FIG. 1 from the vicinity of the peripheral edge of the center hole 2 to the outer peripheral edge of the disc substrate 1 when the clamping hub 11 is attached to the disc substrate 1. It is desirable that the size is formed such that it does not reach the region 4 and is located in the non-signal recording region 5 on the peripheral edge of the center hole 2.

As shown in FIG. 3, the outer peripheral surface of the hub body 12 on which the flange portion 14 is bent is inclined so as to decrease in diameter from the base end side toward the tip end side. An inclined surface portion 15 having a tapered shape is formed. The inclined surface portion 15 has an outer peripheral diameter r ₃ on the base end side where the flange portion 14 is continuously provided, which is slightly larger than the inner peripheral diameter r ₁ of the center hole 2, and is gradually centered toward the distal end side of the hub body 12. The hole 2 is formed in a tapered shape so that the outer peripheral diameter r ₄ is slightly smaller than the inner peripheral diameter r ₁ . Therefore, the front end side of the portion of the hub body 12 where the inclined surface portion 15 is provided has the center hole 2
It has a cylindrical shape with an outer diameter slightly smaller than the inner diameter r ₁ .

The hub body 12 has a flange portion 1
The disk substrate 1 is arranged so that the tip side having the bottom portion 13 protrudes from the other main surface of the disk substrate 1 when the disk substrate 4 is locked to the one main surface 1a side of the disk substrate 1 and fitted into the center hole 2. The height h ₁ is greater than the thickness d _{1 of 1} .

Further, the bottom portion 13 on the tip side of the hub body 12
A spindle shaft engaging hole 14 with which the tip of the spindle shaft projecting to the center of the disk table of the disk rotation drive mechanism on which the optical disk 1 to which the clamping hub device 10 is attached is engaged is formed in the central part of the. Has been drilled. The spindle shaft engaging hole 14 is formed with an inner peripheral diameter substantially the same as that of the spindle shaft so that the spindle shaft is closely fitted. A rising piece 16 is provided on the periphery of the spindle shaft engaging hole 14 in order to ensure smooth and reliable engagement of the spindle shaft engaging with the spindle shaft engaging hole 14 and to protect the spindle shaft. It is provided.

In the clamp hub device 10 according to the present invention, the hub body 12 is fitted in the center hole 2 and the clamp hub 11 arranged on the disc substrate 1 is fixedly supported on the disc substrate 1. It has a fixing member 17. The fixing member 17 is engaged and held on the outer periphery of the tip end side of the hub body 12 protruding from the other main surface of the disk substrate 1, and as shown in FIG.
Is larger than the inner peripheral diameter r _{1 of} the hub body 12, and is formed in a ring shape having a size large enough to support the peripheral edge of the center hole 2 when engaged and held on the outer periphery on the tip side of the hub body 12.

The fixing member 17 is formed by punching out a plate material which is not easily elastically deformed when it is engaged with and held on the outer periphery of the hub body 12 on the distal end side. It is formed of a metal plate similar to the material of the clamp hub 11.

Further, on the inner peripheral side of the fixing member 17, a fixing member engaging hole 18 formed in the peripheral surface on the tip end side of the hub body 12 is formed.
An engaging protrusion 19 that engages with is provided so as to protrude toward the center. Three engaging projections 19 are provided at equal intervals. Therefore, the fixing member engaging hole 18 also corresponds to the engaging projecting piece 19 on the peripheral surface of the hub body 12 on the tip side.
It is provided in one place.

As shown in FIG. 4, the fixing member engaging hole 18 formed in the peripheral surface on the tip end side of the hub body 12 with which the engaging protruding piece 19 of the fixing member 17 engages, as shown in FIG. Engagement protrusion insertion hole 1 having a width sufficient to insert 19 into the hub body 12
8a and an engagement groove 18b that engages and holds the engagement protrusion 19 with each other.
Consists of. The engagement protrusion insertion hole 18a is provided in the hub body 1
2 is formed from the bottom portion 13 of the hub body 12 to a portion of the hub body 12 projecting from the other main surface of the disk substrate 1, and the engaging groove 18
b is bored from the side edge on the peripheral surface side of the engaging projection insertion hole 18a to the circumferential direction of the hub body 12.

The engaging groove 18b is formed in the flange portion 1
The distance from 4 is set to a position slightly larger than the thickness d ₁ of the disk substrate 1.

Further, the clamp hub device 10 of the present embodiment.
In this case, when the clamping hub 11 is arranged on the disk substrate 1, as shown in FIG. 3, it has a ring shape interposed between the flange portion 14 and one main surface 1a of the disk substrate 1. It has a cushioning material 20. The cushioning member 20 is elastically deformed when the fixing member 17 is engaged and held at the tip end side of the hub body 12 to sandwich the disc substrate 1 together with the flange portion 14, and the clamping hub 11 is stabilized with respect to the disc substrate 1. It is designed to be held in the opened state. In order to realize such a function, the cushioning material 20 is made of a non-woven fabric or urethane having a low elastic coefficient.

The cushioning member 20 is formed independently of the clamp hub 11, and when the clamp hub 11 is attached to the disc substrate 1, the flange portion 14 and one main surface 1a of the disc substrate 1 are formed. It may be interposed therebetween, or may be previously attached to the surface of the flange portion 14 facing the one main surface 1a of the disk substrate 1 to be integrated. In order to ensure that the cushioning material 20 is interposed between the flange portion 14 and the one main surface 1a of the disk substrate 1, it is desirable that the cushioning material 20 be integrated with the flange portion 14.

Further, the clamp hub device 1 of the present embodiment.
In the case of 0, a ring-shaped cushioning material 21 formed of non-woven fabric, urethane or the like having a low elastic coefficient is also provided between the fixing member 17 and the other main surface 1b of the disk substrate 1 like the cushioning material 20. Intervened. The cushioning material 21 functions so as not to damage the disk substrate 1 when the fixing member 17 is engaged and held on the tip side of the hub body 12.

This cushioning material 21 is also formed independently of the clamping hub 11, and when the clamping hub 11 is mounted on the disc substrate 1, it is provided between the fixing member 17 and the other main surface 1b of the disc substrate 1. It may be interposed, or the other main surface 1 of the disk substrate 1 of the fixing member 17
It may be integrated by pasting it on the surface facing b.

The clamping hub device 10 according to the present invention configured as described above is provided with a center hole 2 in the disk substrate 1.
In order to mount the optical disc 3 on which only the hole is formed, the hub body 12 is attached to the center hole 2 of the optical disc 3 as shown in FIG.
Then, the flange portion 14 is locked to the one main surface 1a side of the disc substrate 1 to mount the clamping hub 11 on the optical disc 3.

At this time, the ring-shaped cushioning material 20 is fitted on the hub body 12 so as to be interposed between the flange portion 14 and the one main surface 1a of the disk substrate 1.
In addition, when the cushioning material 20 is integrated with the flange portion 14, it is not necessary to fit the hub body 12.

When the clamping hub 11 is mounted on the optical disc 3 in this manner, the peripheral surface 12a of the hub body 12 on the front end side is formed.
As shown in FIG. 5, the fixing member engaging hole 18 formed in the above protrudes so as to face the other main surface 1b side of the disk substrate 1.

Here, the fixing member 17 is engaged with and held by the hub body 12. In order to engage and hold the fixing member 17 with the hub body 12, the engaging protrusion 19 is inserted into the engaging protrusion insertion hole 18a of the fixing member engaging hole 18, and the fixing member 17 is fitted into the hub body 12. To dress. Then, the engaging protrusion 19
5 into the engaging groove 18b of the fixing member engaging hole 18 to rotate the fixing member 17 in the circumferential direction of the hub body 12 in the direction of the arrow X in FIG. 5, and as shown in FIG. Are engaged with the engaging groove 18b.

By the way, when the fixing member 17 is engaged and held by the hub body 12, the cushioning material 21 is fitted and fixed on the tip side of the hub body 12 protruding from the other main surface 1b side of the disk substrate 1. It is arranged so as to be interposed between the member 17 and the other main surface 1b of the disk substrate 1. When the cushioning material 21 is integrated with the fixing member 17, it is not necessary to fit the hub body 12.

Then, the engaging projection 19 is fixed to the fixing member engaging hole 1
When the fixing member 17 is engaged and held by the hub body 12 by engaging with the engaging groove 18b of No. 8, the fixing member 17 and the disc substrate 1 are disposed between the flange portion 14 and the one main surface 1a of the disc substrate 1. Each cushioning material 20, 21 interposed between the other main surface 1b is compressed. Then, as shown in FIG. 3, the clamping hub 11 holds the disc substrate 1 by the flange portion 14 and the fixing member 17, and is attached to the center hole 2 portion of the disc substrate 11.

By the way, when the hub body 12 is fitted in the center hole 2 and the fixing member 17 is engaged with and held by the clamping hub 11 arranged on the disk substrate 1, the respective cushioning materials 20, 21 are released as described above. When compressed, the flange portion 14 and the fixing member 17 hold the disc substrate 1,
As shown in FIG. 3, the tapered inclined surface portion 15 formed on the outer peripheral surface of the hub body 12 on the proximal end side enters into the center hole 2. At this time, a portion of the tapered inclined surface portion 15 having an outer peripheral diameter r ₃ larger than the inner peripheral diameter r _{1 of the} center hole 2 enters the center hole 2 and is one end side of the center hole 2. The disk substrate 1 comes into contact with the peripheral edge on the one main surface 1a side.

That is, the engagement groove 18b with which the engagement projection 19 is engaged is located at a distance from the flange portion 14 to the disc substrate 1.
Since it is provided at a position slightly larger than the thickness d _{1 of}
This is because when the fixing member 17 is engaged with and held by the hub body 12, the cushioning members 20 and 21 are compressed to hold the disk substrate 1.

By contacting one end of the center hole 2 of the inclined surface portion 15 formed on the hub body 12 in this way,
Absorbing a thickness error due to a processing error of the clamping hub 11 and a molding error of the disk substrate 1, and further an error in the hole diameter of the center hole 2, the flange member 14 and the fixing member 17 can reliably sandwich the disk substrate 1. Put on the clamp hub 1
1 can be attached to the optical disc 3.

In particular, in this embodiment, the fixing member 1
Since the cushioning material 20 that is compressed when 7 is engaged and held by the hub body 12 is interposed between the flange portion 14 and the one main surface 1a of the disc substrate 1, the center provided on the disc substrate 1 is provided. The processing error of the outer diameter of the inclined surface portion 15 formed in the hole 2 and the hub body 12 is absorbed, and the inclined surface portion 15 is surely brought into contact with one end side of the center hole 2 for clamping hub 1.
1 can be integrated with the optical disc 3 in a stable state.

Further, by interposing the cushioning material 21 between the fixing member 17 and the other main surface 1b of the disk substrate 1, when the fixing member 17 is engaged and held by the hub body 12, it is further engaged. In the state where it is held, the fixing member 17
Can be prevented from contacting the other main surface 1b of the disk substrate 1, and damage to the disk substrate 1 can be prevented.

The optical disc 3 to which the clamping hub 11 is attached as described above can be attached to the disc rotation drive mechanism configured as shown in FIG. 6, which can be attached without using a clamp member. .. The disk rotation drive mechanism 30 includes a drive motor 31 and the drive motor 3
1 and a disk table 33 integrally fitted and arranged on the spindle shaft 32, and a magnet 34 for attracting the clamping hub 11 is arranged on the inner peripheral side of the turntable 33. ..

As shown in FIG. 6, the optical disc 3 in which the clamping hub 11 of the present invention is attached to the disc rotation driving mechanism 30 having the above-described structure is used as shown in FIG.
2 and the spindle shaft engaging hole 14 formed in the spindle shaft 3
The disk is supported by the disk mounting surface 33b at the tip of the disk supporting portion 33a which is formed by rising the peripheral edge of the center hole 2 of the other main surface 1b of the disk substrate 1 to the outer peripheral edge of the disk table 33. It is placed on the table 33. At this time, the tip end side of the hub body 12 enters into the disc support portion 33 a formed on the disc table 33 and approaches the magnet 34. Then, the clamping hub 11 is attracted by the magnet 34, so that the optical disk 3 is integrally clamped to the disk table 33, and is mounted in a state in which the optical disk 3 can be rotationally driven exactly in synchronization with the disk table 33.

By the way, the clamping hub 11 which constitutes the clamping hub device 10 according to the present invention includes the hub body 12
By removing the fixing member 17 engaged and held at the tip side of the disk substrate 1, the disk substrate 1 can be separated from the center hole 2. The fixing member 17 is detached from the hub body 12 by rotating the engaging projection 19 in the direction opposite to the direction in which the engaging projection 19 is engaged with the engaging groove 18b of the fixing member engaging hole 18.

The optical disk 3 from which the clamping hub 11 has been removed has no center hole 2.
It is possible to mount the disk on a disk rotation drive mechanism including a clamp member that clamps the disk together with the disk table.

In the above-mentioned embodiment, the example applied to the optical disc has been described, but the present invention is not limited to the optical disc, but is applied to the disc having only the center hole so that the disc provided with the clamping hub. With the compatibility with the disk table, the disk table can be mounted on a disk rotation drive mechanism that does not include a clamp member for sandwiching the disk.

[0048]

As described above, the clamping hub device according to the present invention can be detachably attached to the disc having only the center hole, so that the disc having only the center hole is provided with the clamping hub. Since it can be mounted on a disk rotation drive mechanism that enables the mounting of a disk, it is possible to use a disk without a clamping hub and a disk with a clamping hub with compatibility with a common disk rotation drive mechanism. Eggplant

Further, when the fixing member is engaged and disposed on the outer peripheral portion of the hub body on the distal end side, the clamping hub is attracted so as to further project to the other main surface side of the disk on which the distal end side of the hub body projects. The inclined surface part formed on the outer peripheral surface of the hub body is brought into contact with the peripheral edge on one end side of the center hole, the error between the outer peripheral diameter of the hub body and the inner peripheral diameter of the center hole is absorbed, and the disc is closely attached. Therefore, the disc to which the clamping hub is attached can be reliably attached to the disc rotation drive mechanism.

[Brief description of drawings]

FIG. 1 is an assembled perspective view showing a clamping hub device according to the present invention and an optical disk to which the clamping hub device is mounted.

FIG. 2 is an assembled sectional view showing a clamping hub device according to the present invention and an optical disk on which the clamping hub device is mounted.

FIG. 3 is a cross-sectional view showing a state in which the clamp hub device according to the present invention is attached to an optical disc.

FIG. 4 is a perspective view showing a clamp hub that constitutes the clamp hub device according to the present invention.

FIG. 5 is a side view showing a state in which a clamping hub is arranged on an optical disc.

FIG. 6 is a cross-sectional view showing a state in which an optical disc to which the clamping hub device according to the present invention is attached is attached to a disc rotation drive mechanism.

[Explanation of symbols]

 11 Clamping Hub 12 Hub Main Body 14 Flange Part 15 Inclined Surface Part 17 Fixing Member 18 Fixing Member Engagement Hole Formed in Hub Body 19 Engaging Projecting Piece

Claims (1)

[Claims] 1. A hub body fitted into a center hole of a disc, a flange portion provided on a base end side of the hub body and locked to one main surface side of the disc, and the flange portion. And a clamping hub having an inclined surface portion formed on the outer peripheral surface of the hub body so as to decrease in diameter from the base end side to the tip end side, and the other of the discs fitted in the center hole of the disc. Of the hub body projecting toward the main surface side of the hub body, is detachably engaged with the outer periphery of the hub body, and includes a fixing member for holding the disc together with the flange portion and fixing and supporting the clamping hub to the disc. Hub device for disc clamping.