WO2003041078A1

WO2003041078A1 - Optical disk and method of chucking the optical disk

Info

Publication number: WO2003041078A1
Application number: PCT/JP2002/011586
Authority: WO
Inventors: Mamoru Usami; Hideki Ishizaki; Masanori Shibahara
Original assignee: Tdk Corporation
Priority date: 2001-11-06
Filing date: 2002-11-06
Publication date: 2003-05-15
Also published as: JP2003141776A

Abstract

An optical disk (10) and a method of surely chucking the optical disk without forming a center hole for chucking therein, the optical disk (10) wherein the center hole for chucking is not provided, an information surface (14) thereof is formed in a flat surface, information areas (16) are provided in the overall area of the information surface (14), a circular projected clamp area (20) is formed at the rear surface (18) center of the disk, a chucking member (24) comprises a circular recessed part (26) fitted to the outer side of the clamp area (20), and the circular recessed part (26) and the clamp area (20) are formed so as to be engaged with and disengaged from each other by a ball ramp mechanism (30).

Description

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Specification

Optical disc and optical disc chucking method

The present invention relates to an optical disk having no center hole and a method of checking the optical disk. Background art

In general, disc-shaped optical recording media (optical discs) such as CDs (Compact Discs) and DVDs (Digital Versatile Discs) are used for recording and Z or playback, and are checked by a recording and / or playback device using a chucking member. Center hole is provided.

On the other hand, as an optical recording medium for a portable device such as a digital still camera or a digital video camera, for example, a small optical disk having a diameter of 8 cm is used for an optical disk having a diameter of 12 cm. I have.

Optical discs used in such portable devices are required to be further miniaturized in order to improve portability, and on the other hand, to increase the recording capacity.

To meet these demands, expanding the recording area to the inner circumference is one solution. However, conventionally, a chucking mechanism and an optical pickup have been used for the optical disc to facilitate the attachment and detachment of the optical disc. Because they were located on the same side, it was difficult to extend the recording area near the center of the optical disk. Disclosure of the invention

The present invention relates to an optical disk capable of being used as a recording area up to the vicinity of the center of an optical disk which has conventionally been a dead space, and a method of chucking the optical disk. ^

The purpose is to provide the law.

As a result of our research, the present inventor eliminated the center hole of the optical disk, and further formed a recording layer on the light incident surface side of the substrate that constitutes the optical disk, so that the center was not conscious of charging and A sufficient recording area is ensured up to the vicinity, and a clamping area for chucking that can be engaged with the chucking member is formed on the back surface opposite to the light incident surface so that chucking is possible.

That is, according to the following invention, a sufficient recording area can be ensured and chucking can be performed.

(1) An information area including a recording layer capable of recording and / or reproducing information is provided on the surface of the substrate that constitutes the optical disc on the side where the laser beam for recording and / or reproducing information is incident. An optical disk having a clamping area for chucking in either a circular convex shape or a circular concave shape concentric with the optical disk on a side of the optical disk opposite to an information surface having the information array.

(2) The clamp area includes a part of a pole clamp mechanism, moves in a thickness direction of the optical disc with respect to a chucking member, and is detachable by the ball clamp mechanism. 1) Light disk.

(3) The optical disc according to (2), wherein the clamp area protrudes from an outer area thereof and is formed in a convex shape, and the outer periphery of the clamp area has a clamp groove with which a clamp ball of the pole clamp mechanism is engaged. .

(4) The optical disc according to (2), wherein the clamp area has a concave shape thinner than an outer area thereof, and has a clamp groove on an inner periphery with which a clamp pole of the ball clamp mechanism is engaged.

(5) The clamp area has a convex shape protruding from an outer region thereof, and further has a 近傍 shape near a center portion thereof, and the ball clamp has an inner periphery. _g

The optical disk according to C 2), further comprising a clamp groove for engaging a clamp pole in the mechanism.

(6) At least a part of the information-surface-side circular region on the information surface opposite to the clamp area is a part of the information area, (1) to (5). Any optical disk.

(7) An information area including a recording layer capable of recording, Z, or reproduction of information is provided on a surface of a substrate constituting an optical disc on which a laser beam for recording, Z, or reproduction of information is incident. A method for chucking an optical disc, comprising: forming a clamper for chucking, either a circular convex or a circular concave, concentric with the optical disc, on a side of the optical disc opposite to the information surface having the information area; A method for chucking an optical disk, wherein a chucking member is engaged with the clamp area.

(8) The optical disc chuck according to (7), wherein the clamp area is provided with a ball clamp mechanism, and the optical disc is moved relative to the chucking member in a thickness direction of the optical disc to be disengaged. Method.

(9) The clamp area has a convex shape protruding from an outer region thereof, and has a clamp groove on an outer periphery with which a clamp pole of the ball clamp mechanism is engaged. (8) An optical disc according to (8), characterized in that a circular recess fittable around the outer periphery of the clamper is disposed, and a clamp pole disposed on the inner periphery of the circular recess is engaged with the clamp groove. How to check.

(10) The clamp area has a concave shape which is thinner than an outer region thereof, and has a clamp groove on an inner periphery with which a clamp ball of the pole clamp mechanism is engaged, and the chucking member has a concave clamp area. A fitable circular protrusion is arranged on the inner circumference of the The optical disk chucking method according to claim 8, wherein said clamp pole is engaged with said clamp groove.

(11) The clamp area has a convex shape protruding from an outer region thereof, and further has a concave portion near a center portion thereof, and has a clamp groove on an inner periphery with which a clamp ball of the ball clamping mechanism engages. The chucking member is provided with a circular protrusion that can be fitted on the inner periphery of the concave clamp area, and a clamp ball disposed on the outer periphery of the circular protrusion is engaged with the clamp groove. (8) The optical disk checking method according to (8). BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic cross-sectional view showing an optical disc and a chucking member according to a first example of an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a range of an information area on an information surface of the optical disc.

FIG. 3 is a schematic diagram showing a circular area and an outer area on the back surface of the optical disc.

FIG. 4 is a sectional view showing an optical disc and a chucking member according to a second example of the embodiment of the present invention.

FIG. 5 is a sectional view showing an optical disc and a chucking member according to a third example of an embodiment of the present invention.

FIG. 6 is a cross-sectional view illustrating an optical disc and a chucking member according to a fourth example of the embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating an optical disc and a chucking member according to a fifth example of an embodiment of the present invention.

FIG. 8 is a cross-sectional view showing an optical disc and a chucking member according to a sixth example of an embodiment of the present invention. FIG. 9 is a schematic diagram showing another aspect of the information area on the information surface of the optical disc. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1, an optical disk 10 according to a first example of the embodiment of the present invention has an information surface 14 which is one surface of a disc-shaped substrate material 12, for recording and storing information. An information area 16 that can be reproduced is provided, and a clamping area 20 for chucking is formed on a back surface 18 opposite to the information surface 14.

The information surface 14 has a substantially continuous straight plane shape from the disk outer periphery 1OA of the disk-shaped base material 12 to the disk center 10B (both shown in FIG. 2). That is, the center hole of the disc-shaped substrate material 12 is not provided.

Here, the term “substantially continuous” means that the center and the outermost circumference may be used for other purposes for configuring the optical disc, and therefore, it is not necessary to use a part if a sufficient recording area can be secured. It is. The other object is that, for example, the center is a resin supply point at the time of substrate formation, and the outermost periphery is a main part when a light transmitting layer is formed on a recording layer.

As shown in FIG. 2, the information area 16 is provided on the entire surface of the information surface 14 from the vicinity of the outer periphery 10A of the disk to the vicinity of the center 10B of the disk.

The clamp area 20 has a circular area 22 A (see FIG. 3) centered on the disk center 10 B on the back surface 18 of the disk-shaped substrate material 12, and an outer area 22 B thereof. It is thick and formed in a circular convex shape.

On the other hand, a chuck for clamping the clamp area 20 When the upper end of FIG. 1 is in close contact with the rear surface 18 of the disk-shaped substrate material 12 in FIG. 1, the circular concave portion 2 6 fits from the rear surface 18 into the circular convex clamp area 20. It has. Reference numeral 28 in FIG. 1 denotes a spindle that rotates around the central axis of the circular recess 26.

The circular convex portion 20 of the circular convex clamp member 24 and the circular concave portion 26 of the chucking member 24 are detachable by a Paul Grump mechanism 30.

The pole clamp mechanism 30 includes a circular V-shaped or U-shaped clamp groove 30 A formed in the circular outer peripheral surface 2 OA of the circularly-projected clamper 20 and the circular concave portion 26. A plurality of clamp balls 30B are provided on a circular inner peripheral surface 26A so as to be movable in a certain range in a radial direction. Reference numeral 30 C in FIG. 1 denotes a spring for urging the clamp ball 30 B toward the center of the circular recess 26.

When the optical disk 10 as described above is actually used, the optical disk 10 is pushed so that the clamp member ≥0 is inserted into the circular concave portion 26 # of the chucking member 24 from above in FIG. At this time, push the clamp ball 30 B until it fits into the clamp groove 30 A.

By this fitting, the optical disc 10 is fixed to the chucking member 24 by the ball clamp mechanism 30 in a state of being in close contact with the upper end surface of the chucking member 24 in FIG.

Recording / reproduction with respect to the information area 16 of the optical disc 10 is performed by irradiating a laser beam from the information surface 14 side using an optical pickup 32 (not shown in the whole).

The optical disk 10 in the example of this embodiment can be firmly fixed to the chucking member 24 via the clamp area 2.0 force S and the ball clamp mechanism 30, so that the magnet and the metal sucked by the magnet It can rotate stably at high speed without using a plate. 'In addition, the optical disk 10 has a clamp area 20 on the opposite side to the information surface 14. ^

As a result, almost the entire information surface 14 can be used as the information area 16 to increase the recording capacity.

In the first example of the above embodiment, the clamp area 20 is convex and the chucking member 24 for chucking the clamp area 20 is concave. However, this is the same as the second example of the embodiment shown in FIG. As in the optical disc 40, the irregularities may be reversed.

This optical disc 40 has a circular concave clamp area 44 coaxial with the disc center 10 B at the same position as the clamp area 20 on the back side 48 side of the disc-shaped substrate material 42. The chucking member 46 is provided with a circular convex portion 50 that can be fitted from below in the clamp area 44 in FIG. 4, and a circular concave shaped clamp area 44 and a circular convex portion 50 are provided. It can be freely disengaged by a ball clamp mechanism 52.

The ball clamp mechanism 52 includes a clamp groove 52 A formed in the inner peripheral surface 44 A of the circular concave portion in the clamp area 44 and a radial direction within a certain range from the outer peripheral surface of the circular convex portion 50. And a spring 52C which is provided in the circular convex portion 50 and biases the clamp pawn 52B outward in the radial direction. I have. Further, as in an optical disk 60 according to a third example of the embodiment shown in FIG. 5, the clamp area 62 is made convex like the first example of the embodiment, and the As in the second example of the embodiment, a circular clamp recess 64 may be provided, and the clamp groove 66 A of the pole clamp mechanism 66 may be formed on the inner peripheral surface 64 A.

The chucking member 68, the clamp ball 66B of the ball clamp mechanism 66, and the configuration thereof are the same as those of the second example of the above-described embodiment, and therefore, the same portions are denoted by the same reference numerals as in FIG. .

Further, as in an optical disk 70 of a fourth example of the embodiment shown in FIG. 6, an engagement region between the clamp concave portion 72 and the chucking member 18 is formed. o The optical disk may be stably mounted. As in the optical disk 80 of the fifth example of the embodiment shown in FIG. 7, the clamp area 82 is formed in a tapered cylindrical shape having an angle, and the sixth embodiment of the embodiment shown in FIG. Like the optical disk 90 in the example, the clamp area 92 is formed in a groove shape in cross section, and the clamp pole 66B is brought into contact with the tapered surface of the free angle so that the optical disk can be mounted more strongly. It may be.

Other configurations in the second to sixth examples of the embodiment are denoted by the same reference numerals as those shown in FIG.

In each of the optical disks 10, 40, 60, 70, 80, 90 in the example of the above embodiment, almost the entire area of the information surface 14 is the information area 16. The present invention is not limited to this, and the information surface 14 side is a straight plane and is not provided with a center hole or the like for chucking. Any optical disk may be used. Therefore, for example, as shown in FIG. 9, a portion near the disk center 10B may be set as a non-information area 17 (for example, a mirror area).

Even in this case, the information area 16 is provided at least in the circular area opposite to the clamp areas 20 and 44. Industrial applicability

Since the present invention is configured as described above, the optical disk can be firmly chucked even when the central hole for chucking is not provided, whereby high-speed rotation is possible, and the information surface of the optical disk Has an excellent effect that the recording capacity can be increased by using almost the entire area as an information area.

Claims

The scope of the claims

1. An information area including a recording layer on which information can be recorded and / or reproduced is provided on the surface of the substrate constituting the optical disk on which the laser beam for recording and / or reproducing information is incident. An optical disc,

An optical disc having a clamping area for chucking in either a circular convex shape or a circular concave shape concentric with the optical disc, on a side of the optical disc opposite to an information surface having the information area.

2. The device according to claim 1, wherein the clamp area includes a part of a pole clamp mechanism, moves in a thickness direction of the optical disc with respect to a chucking member, and is detachable by the ball clamp mechanism. Light disc.

3. The optical disc according to claim 2, wherein the clamp area has a convex shape protruding from an outer region thereof, and has a clamp groove on an outer periphery with which a clamp ball of the ball clamp mechanism is engaged. .

4. The optical disc according to claim 2, wherein the clamp area has a concave shape thinner than an outer area thereof, and has a clamp groove on an inner periphery with which a clamp pole of the ball clamp mechanism is engaged. .

5. The clamp area according to claim 2, wherein the clamp area has a convex shape protruding from an outer region thereof, and further has a concave portion near a center portion thereof, and a clamp ball of the ball clamp mechanism is engaged with an inner periphery. An optical disc characterized by having a clamping groove to be formed.

6. In any one of claims 1 to 5, at least a part of the information surface side circular area on the information surface opposite to the clamp area is a part of the information area. optical disk.

7. An information area including a recording layer on which information can be recorded and / or reproduced is provided on the surface of the substrate of the optical disk on which the laser beam for recording and Z or reproduction of information is incident. A method for checking an optical disc having

On the opposite side of the optical disc from the information surface having the information carrier, a clamper for chucking, either a circular convex or a circular concave, concentric with the optical disc, is formed. And a method for chucking an optical disk.

8. The optical disc according to claim 7, wherein the clamp area is provided with a pole clamp mechanism, and the optical disc is moved relative to the chucking member in a thickness direction of the optical disc to be disengaged. How to chuck.

9. In claim 7, the clamp area has a convex shape protruding from an outer region thereof, and has a clamp groove on its outer periphery with which a clamp ball in the ball clamp mechanism is engaged, and the chucking member has A method for chucking an optical disk, comprising: arranging a circular concave portion fittable on the outer periphery of the convex clamp area; and engaging a clamp pole disposed on the inner periphery of the circular concave portion with the clamp groove.

10. The clamp area according to claim 8, wherein the clamp area has a concave shape that is thinner than an outer area thereof, and an inner periphery of the clamp area of the ball clamp mechanism. The clamping member has a clamp groove for engaging therein, and the chucking member has a circular convex portion ′ that can be fitted on the inner periphery of the concave clamp area, and a clamp ball disposed on the outer periphery of the circular convex portion. And engaging the clamp groove with the clamp groove.

11. The clamp area according to claim 8, wherein the clamp area has a convex shape protruding from an outer area thereof, and further has a concave shape near a center portion thereof. A clamping groove to be engaged with the clamping member; a circular projection that can be fitted to an inner periphery of the concave clamping area; and a clamp pole disposed on an outer periphery of the circular projection. A method for chucking an optical disk, comprising: