JPH11219557A - Holding device of optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a holding device of an optical disk constituted so as to increase the storage capacity for the small diameter disk by appropriately adjusting the size of the clamp area in accordance with the diameter of the optical disk. SOLUTION: The device includes a projecting part 21b whereon a center hole of the optical disk is fitted, a shoulder part 21a whereon the peripheral edge of the center hole of the optical disk is placed around this projecting part 21b, a turntable 21 rotationally driven by a rotation driving means, an adapter ring 22 attachably/detachably mounted against the turntable 21 to form the placing surface of the large diameter optical disk at the time of mounting, and optical disk holding parts. 23, D2a, D3a for pressurizing the optical disk against the optical disk placing surface, then in the case of small diameter optical disk, the optical disk is supported with the shoulder part of the turntable 21 in the state when the adapter ring 22 is detached, and in the case of large diameter optical disk, the optical disk is supported with the optical disk placing surface of the adapter ring 22 in the state when the adapter ring 22 is mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device for recording or reproducing data on or from an optical disk, and more particularly to a holding device for supporting the optical disk.

[0002]

2. Description of the Related Art Conventionally, in an optical disk device, an optical disk mounted on a turntable that is driven to rotate is held by an optical disk holding device. This optical disc holding device is provided with a central convex portion of a turntable that is rotationally driven by a spindle motor,
By inserting it into the center hole of the optical disk, lowering the chucking plate from above against the surface of the turntable, and holding the optical disk from above and below by the turntable and chucking plate,
Hold the optical disk.

At this time, in the optical disk, a clamp area around a central hole is sandwiched between the turntable and the chucking plate, and an area radially outside the clamp area is used as a recording area. Will be used. Here, the turntable constituting the clamp area has a diameter of the optical disc mounting surface, and the clamp area has a diameter in the direction perpendicular to the disc surface near the outer periphery of the optical disc (so-called surface runout). Need to be somewhat larger.

[0004]

Incidentally, for example, in the case of a compact disk (hereinafter, referred to as a CD), the disk diameter is usually 120 mm, but the smaller diameter is 80 mm.
mmCD is also in practical use. In the case of a small-diameter optical disk such as an 80 mm CD, the diameter of the optical disk mounting surface of the turntable must be large in order to suppress the surface runout near the outer periphery of the disk to the same level as a large-diameter optical disk such as a 120 mm CD. It may be smaller than in the case of an optical disk.

However, conventionally, both a small-diameter optical disk and a large-diameter optical disk are recorded or reproduced by a common optical disk device. Therefore, a small-diameter optical disk has a clamp area of the same size as a large-diameter optical disk. Will be. For this reason, a small-diameter optical disk has a clamp area larger than necessary, which causes a problem that the recording area is reduced and the recording capacity is also reduced.

SUMMARY OF THE INVENTION In view of the above, the present invention provides an optical disk holding apparatus in which the storage capacity of a small-diameter optical disk is increased by appropriately adjusting the size of the clamp area in accordance with the diameter of the optical disk. It is intended to provide a device.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a projection for fitting a central hole of an optical disk, and a shoulder around which the periphery of the central hole of the optical disk is mounted. And a turntable that is rotatably driven by rotary drive means, and an adapter ring that is detachably mounted on the turntable and forms an optical disc mounting surface larger in diameter than the shoulder when mounted. An optical disk holder for pressing the optical disk against the optical disk mounting surface of the turntable; in the case of a small-diameter optical disk, the optical disk is supported by the shoulder of the turntable with the adapter ring removed. In the case of a large-diameter optical disc, the optical disc is supported by the optical disc mounting surface of the adapter ring with the adapter ring mounted. And the, the optical disc holding device is achieved.

According to the above structure, in the case of a small-diameter optical disk, the center hole of the optical disk is fitted to the projection of the turntable and the center hole of the central hole is removed by removing the adapter ring from the turntable. The periphery is
It is supported by the shoulder of the turntable, and is held by the optical disk holder. In this case, the small-diameter optical disc can be sufficiently deflected near its outer periphery by being sandwiched between the shoulder of the turntable and the optical disc holder.

In the case of a large-diameter optical disk, the adapter ring is mounted on the turntable, so that the optical disk has its central hole fitted on the projection of the turntable and the peripheral edge of the central hole. , Are supported by the shoulder of the turntable and the surface of the adapter ring, and are held by the optical disk holder. In this case, the large-diameter optical disc has a peripheral area of the center hole sandwiched between the shoulder of the turntable and the surface of the adapter ring and the optical disc holding section. As a result, the optical disk is held over a longer range in the radial direction than in the case of a small-diameter optical disk, and even if the optical disk has a large diameter, surface runout near the outer periphery thereof is reliably suppressed. Become.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to FIGS. still,
Since the embodiments described below are preferred specific examples of the present invention, various technically preferred limitations are added.
The scope of the present invention is not limited to these embodiments unless otherwise specified in the following description.

FIG. 1 shows an embodiment of an optical disk device incorporating an optical disk holding device according to the present invention. In FIG. 1, an optical disk device 10 includes a spindle motor 12 as a driving unit that rotationally drives an optical disk 11, and an optical pickup 13. here,
The spindle motor 12 is driven and controlled by an optical disk drive controller 14 and is rotated at a predetermined rotation speed. As will be described later, the optical disk 11 can select and reproduce a plurality of types of optical disks.

The optical pickup 13 irradiates a signal recording surface of the rotating optical disk 11 with light to record a signal or to detect return light from the signal recording surface. A reproduced signal based on the return light is output to the signal demodulator 15.

As a result, the recording signal demodulated by the signal demodulator 15 is subjected to error correction through an error correction circuit 16 and sent to an external computer or the like via an interface 17. With this, the external computer etc.
A signal recorded on the optical disk 11 can be received as a reproduction signal.

The optical pickup 13 is connected to a head access controller 18 for moving the optical pickup 13 to a predetermined recording track on the optical disk 11 by a track jump or the like. Further, a servo circuit 19 for moving the objective lens in the focusing direction and the tracking direction is connected to the biaxial actuator holding the objective lens of the optical pickup 13 at the moved predetermined position.

FIG. 2 shows an embodiment of an optical disk holding apparatus according to the present invention, and FIG. 3 is a schematic plan view thereof, and FIG. 3 is a schematic side view thereof. Shows the case where a large-diameter optical disk is used, and the right half shows the case where a small-diameter optical disk is used. FIG.
3 is a schematic cross-sectional view when a large-diameter optical disc is used in the optical disc holding device of FIG. 3, FIG. 6 is a schematic cross-sectional view when a small-diameter optical disc is used, and FIG. 7 is a large-diameter optical disc without a cartridge. It is a schematic sectional drawing at the time of using. In these figures, the optical disk holding device 2
Reference numeral 0 denotes a turntable 21 that is driven to rotate, an adapter ring 22 that is detachably attached to the tip of the turntable 21, an optical disk holder 23 that presses the optical disk against the turntable 21 from above, And two sets of support shafts 24 and 25 for supporting a cartridge of the optical disk placed on the optical disc at a predetermined position. In the illustrated case, the optical disk holding device 20 is
The large-diameter optical disk is configured to correspond to an optical disk D1 having an outer diameter of 120 mm such as a CD or a high-density recording optical disk and a 120-mm optical disk D2 containing a cartridge, and the small-diameter optical disk is adapted to a 64-mm optical disk D3 containing a cartridge.

The turntable 21 includes a chassis 26
, Is rotatably supported by a bearing 27, and is rotatably driven by a motor 28 (spindle motor) formed on the chassis 26. Further, as shown in FIG. 3, the turntable 21 has a shoulder 21 as an optical disc mounting surface on its upper end.
a, an upwardly projecting projection 21b inserted into the center hole of the optical disc, a flange 21c for supporting the adapter ring 22, and a magnet 21d embedded in the upper surface of the projection 21b. The outer diameter of the projection 21b is selected to be slightly smaller than the inner diameter of the central hole of the optical disk.

The adapter ring 22 has a substantially annular shape as a whole, and its inner edge is selected to have a diameter slightly larger than the outer diameter of the turntable 21 so that the adapter ring 22 can be positioned with respect to the turntable 21. It is supposed to be. The adapter ring 22 is not limited to a simple annular member. For example, when the adapter ring 22 is adapted to optical disks having different diameters, for example, the adapter ring 22 may have a multi-stage upper surface having a different diameter. further,
The adapter ring 22 is formed such that when its inner edge is placed on the flange 21 c of the turntable 21, its upper surface is located substantially flush with the shoulder 21 a of the turntable 21. I have. The adapter ring 22 is moved to an upper retreat position (the right side in FIG. 3 and FIG. 6) by an adapter ring push-up member 29 described later.

As shown in FIG. 5, the optical disk holding portion 23 includes a chucking plate 23a which abuts a central area of the optical disk placed on the turntable 21 almost perpendicularly to the surface of the turntable 21, An arm 23b that supports the chucking plate 23a so as to be movable in a substantially vertical direction, a roller 23c provided at the other end of the arm 23b, and a movable plate 23d having a slope 23e that comes into contact with the roller 23c. It is configured.

The chucking plate 23a is made of a magnetic material.
The optical disk is sandwiched between the turntable 21 and the turntable 21 by being attracted to the magnet 21d. The arm 23b is supported so as to be swingable with respect to a shaft 23f disposed outside, and the swing of the arm 23b causes the chucking plate 23a to hit the upper retracted position (see FIG. 5) and the optical disk. It can be moved between contacting use positions (see FIG. 7).

The movable plate 23d is supported on the chassis 26 so as to be movable in the horizontal direction, and has an upper edge formed in two steps via a slope 23e. Moved on the chassis 26, 120
A first position (see FIG. 7) corresponding to an exposed type (naked) optical disk D1 without a cartridge of mm, a second position (see FIG. 5) corresponding to a large-diameter optical disk D2 containing a cartridge, and a cartridge Small diameter optical disc D3
Is moved to a third position (see FIG. 6) corresponding to. Here, in the first position, the rollers 23
When the roller a contacts the lower side of the slope 23e, the chucking plate 23a is located at the use position, and in the second and third positions, the roller abuts on the upper side of the slope 23f, so that the chucking plate 23a Is located at the retracted position.

As shown in FIG. 6, the movable plate 23d has a guide groove 23g extending obliquely, and the guide groove 23g has an adapter ring push-up member 29.
Are engaged with the guide pins 29a. Here, in the first and second positions, the guide pin 29a is engaged with the lower portion of the guide groove 23g, so that the adapter ring push-up member 29 is located at the lower retracted position. In the third position, the guide pin 29a rises along the guide groove 23g, so that the adapter ring pushing-up member 29 pushes up the adapter ring 22 to the upper retreat position.

Of the above-mentioned support shafts 24, 25, the first support shaft 24 is for supporting a cartridge of a small-diameter optical disk, and as shown in FIG.
And a height regulating shaft 24b, and the second support shaft 2
Reference numeral 5 is for supporting a cartridge of a large-diameter optical disc, and includes a positioning shaft 25a and a height regulating shaft 25b. The first support shaft 24 is mounted on a sub-chassis 30 supported by a leaf spring 24c with respect to the chassis 26. When a large-diameter optical disk cartridge is used, the lower surface of the cartridge is positioned on the positioning shaft. 2
By pressing the upper end of 4a downward, as shown in FIG. 5, the sub-chassis 30 moves downward against the tension of the leaf spring 24c. Here, when the movable plate 23d is at the third position, the sub-chassis 30 is rotated by the movable plate 23d.
The lower surface is regulated by the lock arm 31 disposed on the upper surface 6, so that downward movement is suppressed. The movable plate 23d is rotatably driven by a motor 32 via a transmission mechanism 33, as shown in FIG.

The optical disk device 10 according to the present embodiment comprises:
In the case of the large-diameter optical disk D2 containing a cartridge, the movable plate 23d is first moved to the second position as shown in FIGS. 2 and 3 and as shown in FIG. Thereby, the optical disk holding part 23 is moved to the retracted position, and the adapter ring 22 is moved to the use position. From this state, a large-diameter optical disc D containing a cartridge
2 is mounted on the turntable 21. At this time, as shown in FIG. 5, the cartridge is positioned by the second support shaft 25 and its height is regulated while moving the upper end of the positioning shaft 24a of the first support shaft 24 downward.

The optical disk itself in the cartridge is positioned in the horizontal direction by the convex portion 21b by fitting the center hole of the optical disk into the convex portion 21b of the turntable 21, and the adapter ring in the height direction. 22 is positioned by the upper surface. At this time, since the optical disc itself has the chucking plate D2a at the center thereof, the chucking plate D2a is
The optical disk is held by the turntable 21 by being attracted by the magnet 21d embedded in 1b.

Also, a small-diameter optical disc D containing a cartridge
In the case of No. 3, the movable plate 23d is moved to the third position as shown in the right side of FIGS. 2 and 3 and FIG. It is moved to the retracted position by the adapter ring push-up member 29. From this state, the small-diameter optical disc D3 containing a cartridge is mounted on the turntable 21. At that time, as shown in FIG. 6, the cartridge is positioned by the first support shaft 24 and its height is regulated. At this time, the sub-chassis 30 supporting the first support shaft 24 is restrained from moving downward by the lock arm 31, so that the cartridge can be securely held.

The center hole of the optical disc itself in the cartridge is fitted into the projection 21b of the turntable 21, so that the optical disc itself is positioned by the projection 21b in the horizontal direction, and is shouldered in the height direction. 21a
It is to be positioned by. At this time,
Since the optical disc itself has a chucking plate D3a at the center thereof, the chucking plate D3a is attracted by the magnet 21d embedded in the convex portion 21b of the turntable 21. Will be retained.

Further, in the case of the large-diameter optical disk D1 having no cartridge, as shown in FIG.
By moving d to the second position, the optical disk holding part 23 is moved to the retracted position, and the adapter ring 22 is moved to the use position. From this state, the large-diameter optical disc D1 is mounted on the turntable 21 and the movable plate 2
By moving 3d to the first position, the optical disk holding unit 23 is moved to the use position. As a result, the optical disc D1 is positioned by the convex portion 21b in the horizontal direction, and is positioned by the upper surface of the adapter ring 22 in the height direction by fitting the center hole of the optical disk D1 into the convex portion 21b of the turntable 21. It is supposed to be. Then, the optical disk D1 is held on the turntable 21 by the chucking plate 23a of the optical disk holding unit 23 being attracted by the magnet 21d embedded in the projection 21b of the turntable 21. Become.

As described above, according to the above-described embodiment, when the adapter ring is mounted on the turntable,
Since other components such as mounting members are not required, and are sandwiched between the turntable and the optical disk, the number of components is reduced, the configuration is low-cost, and the configuration is high. Also, it does not hinder the smooth rotation of the optical disk. In the case of a small-diameter optical disc, since the clamp area is only the area corresponding to the shoulder of the turntable at the periphery of the center hole, the recording area becomes large, and a large recording capacity is secured. In addition, in the case of a large-diameter optical disc, the clamp area becomes a region corresponding to the shoulder of the turntable and the adapter ring at the periphery of the center hole, and a sufficient clamp area can be obtained. Is reliably suppressed. Therefore, an appropriate clamp area for suppressing the surface runout of the outer circumference is formed for each of the optical discs having different outer shapes, so that a larger recording area is secured especially for a small-diameter optical disc, and the recording capacity is increased. Will be increased.

In the above embodiment, the case where a large-diameter optical disk without a 120 mm cartridge and an optical disk with a cartridge is used, and a small-diameter optical disk with an optical disk with a cartridge of 64 mm is used, is not limited thereto. Obviously, the present invention can be applied to optical disks of other sizes regardless of the presence or absence of a cartridge. In addition, it is apparent that the present invention can be applied to a case where three or more types of optical disks having different diameters are used by preparing a plurality of types of adapter rings having different diameters and replacing them as appropriate.

[0030]

As described above, according to the present invention, the storage capacity of a small-diameter optical disk is increased by appropriately adjusting the size of the clamp area in accordance with the diameter of the optical disk. , A holding device can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an optical disk device provided with an optical disk holding device according to the present invention.

FIG. 2 is a schematic plan view showing a configuration of an optical disk holding device in the optical disk device of FIG.

FIG. 3 is a schematic sectional view showing the vicinity of a turntable of the optical disk holding device of FIG. 2;

FIG. 4 is a schematic sectional view showing a drive mechanism of the optical disk holding device of FIG.

FIG. 5 is a schematic cross-sectional view showing a state during reproduction of a large optical disk containing a cartridge in the optical disk holding device of FIG. 2;

FIG. 6 is a schematic cross-sectional view showing a state during reproduction of a small optical disk containing a cartridge in the optical disk holding device of FIG.

FIG. 7 is a schematic cross-sectional view showing a state during reproduction of a large optical disk without a cartridge in the optical disk holding device of FIG. 2;

[Brief description of reference numerals]

10 optical disk device, 11 optical disk, 1
2 ... Spindle motor, 13 ... Optical pickup, 14 ... Optical disk drive controller, 15
... Signal demodulator, 16 ... Error correction circuit, 17 ...
Interface, 18 Head access control unit, 19 Servo circuit, 20 Optical disk holding device, 21 Turntable, 22 Adapter ring, 23 Optical disk holding unit, 24 , 25 ...
· Cartridge support shaft, 26 ··· Chassis, 27 ·
..Bearing part, 28 ... motor, 29 ... adapter ring push-up member, 30 ... sub-chassis, 31 ...
-Lock arm, 32 ... motor, 33 ... transmission mechanism.

Claims (5)

[Claims] An optical disk includes a convex portion into which a central hole of the optical disk is fitted, and a shoulder around which the peripheral edge of the central hole of the optical disk is mounted, and is rotationally driven by a rotational driving means. A turntable, an adapter ring detachably mounted on the turntable and forming an optical disk mounting surface larger in diameter than the shoulder portion when mounted, and pressing the optical disk against the optical disk mounting surface of the turntable In the case of a small-diameter optical disk, the optical disk is supported by the shoulder of the turntable in a state where the adapter ring is removed, and in the case of a large-diameter optical disk, the adapter ring is attached. Wherein the optical disk is supported by the optical disk mounting surface of the adapter ring in the inserted state. . 2. The optical disk holding device according to claim 1, wherein the optical disk holding portion is constituted by a magnet embedded in a tip end surface of the turntable and a chucking plate made of a magnetic material. apparatus. 3. The optical disk holding device according to claim 2, wherein the chucking plate is mounted near a center of the optical disk. 4. The optical disk holding device according to claim 2, wherein the chucking plate is retractable on the side opposite to the turntable with respect to the optical disk, and near the center of the optical disk. 5. An optical disk which is held on a turntable by an optical disk holding device and which is driven to rotate is irradiated with light through an objective lens, and return light from a signal recording surface from the optical disk is detected through the objective lens. Optical pickup, a biaxial actuator for supporting the objective lens movably in two axial directions, a signal processing circuit for generating a reproduction signal based on a detection signal from the optical pickup, and a detection signal from the optical pickup And a servo circuit for moving the objective lens in two axial directions. The optical disk holding device comprises: a convex portion having a tip fitted with a central hole of the optical disk; and a central hole of the optical disk around the convex portion. A turntable having a shoulder on which a peripheral edge of the turntable is mounted, and being rotationally driven by rotary drive means; An adapter ring that forms an optical disc mounting surface having a diameter larger than that of the shoulder, and an optical disc holder that presses the optical disc against the optical disc mounting surface. In the case of a small-diameter optical disk, the optical disk is supported by the shoulder of the turntable with the adapter ring removed, and in the case of a large-diameter optical disk, the adapter ring is mounted. An optical disk device, wherein the optical disk is supported by an optical disk mounting surface of an adapter ring.