JP2006236413A - Optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bonding type optical disk whose mechanical strength at the time of high speed rotation is secured. <P>SOLUTION: The optical disk 10B is provided with: an annular first substrate 14 having a recording surface 2 on one surface thereof; an annular second substrate 6 bonded onto the recording surface 2; and an annular body 12 disposed on the inner periphery of the first and the second substrate 14 and 6, having a hole 4a in which a spindle is inserted and forming a clamp region and wherein the first substrate 14, the second substrate 6 and the annular body 12 are integrally rotated, the hole 4a is integrally formed in the axial direction of rotation, and the annular body is formed thicker than the part of the recording surface of the first substrate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present application relates to a bonded optical disc in which first and second substrates are overlapped and integrated.

  An optical disc has a recording surface on which concave and convex signal pit rows are formed in a spiral shape, and recording information such as audio information and video information is recorded in the signal pit rows. Compact Disc) exists. The optical disc is used by being clamped by a spindle motor of an optical disc recording / reproducing apparatus for recording or reproducing recorded information recorded on the recording surface.

  In recent years, an optical disc (for example, a DVD (Digital Versatile Disc) -R, a DVD-RW, etc.) in which two substrates are stacked and integrated in order to compress the recording information to record a larger amount of recording information than a CD. ) Exists. As shown in FIG. 1, the optical disc 50 includes an annular first substrate 51 having a recording surface 51 a and an annular second substrate 52 having no recording surface 51 a, on the first substrate 51. The second substrate 52 is bonded to each other to form a disk shape. The first and second substrates 51 and 52 are formed with an outer shape of 120 mm, a center hole diameter of 15 mm, and a thickness of 0.6 mm, respectively. The optical disk 50 is used as a general movie, music, or data recording disk.

  On the other hand, the current general optical disk is said to have a limit of the number of rotations during recording of about 10,000 rpm from the performance of the spindle motor and the mechanical strength of the substrate.

  However, for the purpose of speeding up recording, in recent years, the rotational speed of the optical disk has been increased. For example, when recording is performed at 16 times speed, the rotational speed of the optical disk is 10000 rpm as shown in FIG. It is necessary to exceed.

  FIG. 2 is a diagram showing the relationship between the rotational speed and the recording position at the recording speed. If the optical disk can withstand up to 10000 rpm, as shown in FIG. 2, for example, when recording at 16 × speed, the recording surface can be recorded only from the outer side of 55 mm outside the optical disk. It turns out that it cannot be used effectively.

  On the other hand, when the optical disk is rotated at a high speed, the outer peripheral edge of the optical disk clamped by the spindle motor sways violently up and down due to the high-speed rotation. The reliability of the mechanical strength is lowered, and in some cases, the optical disk may be cracked.

  The problem to be solved by the present application includes the above-described problem as an example.

  Accordingly, an object of the present application is to provide a bonded optical disk that can ensure mechanical strength during high-speed rotation.

  Hereinafter, the present application will be described. In addition, in order to make an understanding of this application easy, the reference sign of an accompanying drawing is attached in brackets, However, This application is not limited to the form of illustration.

  An optical disc (10) according to claim 1, wherein an annular first substrate (4) having a recording surface (2) on one side, an annular second substrate (4) bonded on the recording surface, An annular body (12) disposed on the inner periphery of the first and second substrates and having a hole (4a) into which a spindle is inserted and forming a clamp region, the first substrate, the second substrate, An optical disk in which a substrate and an annular body rotate integrally, wherein the hole is formed integrally in the axial direction of the rotation, and the annular body is thicker than a portion of the recording surface of the first substrate. It is characterized by that.

  Each embodiment of the optical disc according to the present application will be described below with reference to FIGS. The bonded optical disk described below refers to a DVD that can record or reproduce recording information such as audio information and video information.

-First embodiment-
FIG. 3 is a configuration diagram of the optical disc of the first embodiment, and FIG. 4 is a configuration diagram of the optical disc showing another embodiment of the second substrate. In the following description, the vertical and horizontal directions in FIG. 3 are expressed as the vertical and horizontal directions of the optical disk for the sake of convenience.

  As shown in the figure, the optical disk 10 of the present embodiment includes an annular first substrate 4 having a recording surface 2 on one side, and an annular second substrate 6 disposed so as to be superimposed on the recording surface 2. ing. The optical disc 10 is formed in a disc shape, in which the first substrate 4 and the second substrate 6 are laminated and bonded together with an adhesive or the like. Further, the first substrate 4 and the second substrate 6 rotate integrally.

  The first substrate 4 has a hole 4a into which a spindle is inserted at the center, and an annular portion 8 that forms a clamp region at the periphery of the hole 4a. The annular portion 8 is integrally formed as a thick portion on the inner periphery of the first substrate 4 and is integrally formed in the axial direction of rotation in which the first substrate 4 is rotated by a spindle. . The lower outer periphery of the annular portion 8 is formed to extend in the radial direction, and the recording surface 2 is formed on the upper surface in the radial direction. Thus, the annular portion 8 is formed thicker than the recording surface 2 portion. Further, the recording surface 2 is formed with a concavo-convex signal pit row in a spiral shape. Then, recording information such as audio information and video information is carried in the signal pit row. The material of the first substrate 4 is polycarbonate resin, acrylic resin, polyolefin resin, or the like.

  The second substrate 6 has a hole 6 a in the center, and the hole 6 a is fitted to the outer periphery of the annular portion 8 of the first substrate 4. The second substrate 6 is a dummy substrate that does not have the recording surface 2 and functions as a reinforcing body. The second substrate 6 is made of a polycarbonate resin, an acrylic resin, a polyolefin resin, or the like.

  The first and second substrates 4 and 6 are preferably 0.6 mm thick substrates, but the thickness may be in the range of 0.1 to 0.6 mm.

  Further, the optical disc 10 is preferably used in an optical disc recording / reproducing apparatus that records or reproduces at a maximum rotational speed of 10,000 rpm or more.

  As described above, the annular portion 8 is formed in the vicinity of the hole 4 a of the first substrate 4 to be clamped with the spindle motor of the optical disk 10 (hereinafter referred to as “clamp region S”), and the inner peripheral side of the first substrate 4. By making the thickness as large as possible, it is possible to give the first substrate 4 itself the strength to withstand the tensile stress during high-speed rotation. Therefore, it is possible to prevent the optical disk from being damaged by the high speed rotation. Also, by increasing the thickness of the clamp area S of the first substrate 4, the first substrate 4 can be stably rotated during recording or reproduction of the optical disc 10, so that stable recording or reproduction at high speed rotation is possible. It becomes.

  In addition, the clamp area | region S (annular part 8) of this embodiment functions as an annular body of this application, and the hole 4a of this embodiment functions as a hole of this application.

  Further, as shown in FIG. 4, the second substrate 6 of the optical disk 10 </ b> A may be thinner than the thickness of the first substrate 4. The second substrate 6 can be thinned in this way by forming the annular portion 8 in the clamp region S and increasing the thickness of the inner peripheral side of the first substrate 4 to give the first substrate 4 itself strength. Because it was made.

  In this way, the weight of the optical disk can be reduced and the optical disk can be rotated at a higher speed.

  As described above, the optical disc 10 according to the present embodiment includes the first annular substrate 4 having the recording surface 2 on one side, the second annular substrate 6 attached to the recording surface 2, and the first substrate. And an annular portion 8 that is disposed on the inner periphery of the second substrates 4 and 6 and has a hole 4a into which a spindle is inserted and forms a clamp region, and the first substrate 4, the second substrate 6, The first substrate 4 and the annular portion 8 are integrally formed, and the hole 4a is integrally formed in the axial direction of the rotation. The annular portion 8 is formed thicker than the portion of the recording surface 2 of the first substrate 4.

  In this way, the strength of the first substrate 4 itself can be improved, and the first substrate 4 itself can be provided with a strength that can withstand the tensile stress during high-speed rotation. Therefore, the optical disk 10 is rotated at high speed. Can be prevented from being damaged.

-Second Embodiment-
FIG. 5 is a configuration diagram of an optical disc according to the second embodiment, FIG. 6 is a configuration diagram of an optical disc showing another embodiment of an annular body, and FIG. 7 is a configuration diagram of an optical disc showing still another embodiment of the annular body. . In the following description, the vertical and horizontal directions in FIG. 5 are expressed as the vertical and horizontal directions of the optical disk for the sake of convenience. 5 to 7, the same reference numerals are given to the same parts as those in FIG. 3 and the description thereof is omitted.

  As shown in FIG. 5, the optical disc 10B of the present embodiment has an annular body 12 having a hole 4a into which a spindle is inserted at the center and forming a clamp area, and a single side disposed below the outer periphery of the annular body 12. An annular first substrate 14 having a recording surface 2 and an annular second substrate 6 that is disposed above the outer periphery of the annular body 12 and is laminated and adhered onto the recording surface 2 of the first substrate 14. It is equipped with. Further, the hole 4a is integrally formed in the axial direction of rotation in which the first substrate 14 is rotated by the spindle motor, and the annular body 12 is formed thicker than the portion of the recording surface 2 of the first substrate 14. Yes.

  The optical disc 10B is formed in a disk shape by fitting the outer peripheral portion of the annular body 12 to the inner peripheral portion of the annular first substrate 14 and the second substrate 6 which are overlapped and bonded with an adhesive or the like. ing. Moreover, the said 1st board | substrate 14, the 2nd board | substrate 6, and the annular body 12 rotate integrally.

  The annular body 12 is formed of a material that is more rigid than the first and second substrates 14 and 6, and for example, a material such as a highly rigid resin or metal is used.

  In addition, the hole 4a of this embodiment functions as a hole part of this application.

  Thus, by arranging the rigid annular body 12 in the clamp region S, the rigidity of the optical disc 10B itself is increased so that the optical disc 10B can withstand the tensile stress at high speed rotation. Therefore, it is possible to prevent the optical disk 10B from being damaged by the high speed rotation. Also, by increasing the thickness of the clamp area S of the first substrate 14, the first substrate 14 rotates stably during recording or reproduction of the optical disc 10, so that stable recording or reproduction at high speed rotation is possible. It becomes.

  As described above, the optical disc 10B of the present embodiment includes the annular first substrate 14 having the recording surface 2 on one side, the annular second substrate 6 attached to the recording surface 2, and the first And an annular body 12 which is disposed on the inner periphery of the second substrates 14 and 6 and has a hole 4a into which a spindle is inserted and forms a clamp region, and includes the first substrate 14, the second substrate 6, And the optical disk 10B that rotates integrally with the annular body 12, wherein the hole 4a is integrally formed in the axial direction of the rotation, and the annular body 12 is a portion of the recording surface 2 of the first substrate 14. It is formed thicker.

  In this way, the strength of the clamp region S is improved, and as a result, the strength of the optical disc 10B itself can be improved, and the first substrate 14 itself can have a strength that can withstand the tensile stress during high-speed rotation. Therefore, the optical disk 10 can be prevented from being damaged by being rotated at a high speed.

  Further, as shown in FIG. 6, the annular body 12 may be formed in a substantially L shape having a convex portion 15 a projecting in the radial direction at the lower outer periphery. In such a case, in the optical disk 10C, the inner peripheral portion of the first substrate 14 is fitted to the outer periphery in the radial direction of the convex portion 15a, and the inner peripheral portion of the second substrate 6 is fitted to the upper periphery of the annular body 12. In addition, the second substrate 6 is formed on the upper surface of the recording surface 2 of the first substrate 14 so as to be bonded with an adhesive or the like. The first and second substrates 14 and 6 are made of a lightweight material such as polycarbonate resin, acrylic resin, or polyolefin resin.

  Furthermore, as shown in FIG. 7, the annular body 12 may be formed in a substantially inverted L shape having a convex portion 15 b that protrudes in the radial direction on the outer periphery. In such a case, in the optical disc 10D, the inner peripheral portion of the first substrate 14 is fitted below the outer periphery of the annular body 12, and the inner peripheral portion of the second substrate 6 is fitted to the outer periphery in the radial direction of the convex portion 15b. At the same time, the second substrate 6 is formed on the upper surface of the recording surface 2 of the first substrate 14 and laminated with an adhesive or the like. The first and second substrates 14 and 6 are made of a lightweight material such as polycarbonate resin, acrylic resin, or polyolefin resin.

  Thus, the strength of the clamp region S is improved by disposing the material (annular body 12) having a strength higher than that of the first or second substrate 14 or 6 in the clamp region S of the optical discs 10C and 10D. The rigidity of the 10C and 10D itself is increased so that the optical disks 10C and 10D can withstand the tensile stress at high speed rotation. Therefore, it is possible to prevent the optical discs 10C and 10D from being damaged by the high speed rotation. In addition, since the strength of the clamp region S is improved, the rigidity of the optical disc itself is increased, and thus a light material can be used for the second substrate 6. In this way, it is possible to reduce the weight of the optical discs 10C and 10D and to increase the rotational speed of the optical discs 10C and 10D.

  As described above, the optical disks 10C and 10D of the present embodiment use a material (annular body 12) having a strength stronger than that of the first or second substrate 14 or 6 in the clamp region S of the optical disks 10C or 10D. As a result, the strength of the clamp region S is improved, and as a result, the optical discs 10C and 10D themselves can be provided with a strength that can withstand the tensile stress during high-speed rotation, so that the optical disc is damaged by high-speed rotation. Can be prevented. In addition, since the strength of the clamp region S is improved, the rigidity of the optical disc itself is increased, and thus a light material can be used for the second substrate 6. In this way, it is possible to reduce the weight of the optical discs 10C and 10D and to increase the rotational speed of the optical discs 10C and 10D.

  The present application is not limited to the above embodiment, and may be implemented in various forms. For example, in the second embodiment, as shown in the first embodiment, the second substrate 6 may be made thin.

  Further, the optical disk of the present application may be a two-layer recording type optical disk such that the second substrate 6 has the recording surface 2 like the first substrates 4 and 14. Further, it can be applied to various forms such as reproduction only.

It is a block diagram of the conventional optical disk. It is the figure which showed the relationship between the rotation speed in the recording speed of the optical disk generally used, and a recording position. It is a block diagram of the optical disk of 1st Embodiment. It is other embodiment of a 2nd board | substrate. It is a block diagram of the optical disk of 2nd Embodiment. It is other embodiment of an annular body. It is other embodiment of an annular body.

Explanation of symbols

2 Recording surface 4, 14 First substrate 4a Hole 6 Second substrate 8 Annular portion 10, 10A, 10B Optical disc

Claims (7)

An annular first substrate having a recording surface on one side;
An annular second substrate pasted on the recording surface;
An annular body disposed on the inner periphery of the first and second substrates, having a hole into which the spindle is inserted and forming a clamp region;
An optical disc in which the first substrate, the second substrate, and the annular body rotate integrally,
The optical disk according to claim 1, wherein the hole is formed integrally in the axial direction of the rotation, and the annular body is thicker than a portion of the recording surface of the first substrate.   The optical disk according to claim 1, wherein the annular body is integrally formed as a thick portion of the first substrate on an inner periphery of the first substrate.   The optical disk according to claim 1, wherein the annular body is made of a material having higher rigidity than the first and second substrates.   4. The optical disc according to claim 1, wherein the second substrate is a substrate that does not have a recording surface and is thinner than the first substrate.   The optical disk according to claim 1, wherein the second substrate is made of a material that is lighter than the first substrate.   6. The optical disc according to claim 1, wherein the first and second substrates have a thickness of 0.1 to 0.6 mm.   7. The optical disk according to claim 1, wherein the optical disk is a system for recording or reproducing at a maximum rotational speed of 10,000 rpm or more.

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