JP2004303385A - Set method and device of disk and stamper in pit transferring process of optical disk - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a setting method of a disk and a stamper, in which air bubble is prevented from intruding between the disk 10 and the stamper 11 and accurate bit transfer can be performed, in a pit transferring process of the optical disk in which the pit is transferred to the disk by pressing the disk 10 to the stamper 11. <P>SOLUTION: An outer peripheral part of the stamper 11 is pressed down and warped by a first pressing means 6 in a state in which a center part of the stamper is placed on a set mount 1 and supported, after the center part of the disk 10 is pressed to the stamper 11 by a second pressing means 7 from above of the stamper 11 in this state and positions of the both are fixed, press-down of the outer peripheral part of the stamper 11 by the first pressing means 6 is released, warp of the stamper 11 is returned so as to be brought into contact with the disk 10. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method and an apparatus for setting a disk and a stamper used in a process of transferring a pit to a disk by pressing the disk against a stamper when manufacturing a large-capacity optical disk.
[0002]
[Prior art]
In a next-generation large-capacity optical disk, a two-layer disk using a lamination method is an ultra-thin sheet (hereinafter referred to as a transfer layer) made of an ultraviolet curable resin as a transfer layer on a resin disk having a thickness of 1.1 mm on which a first recording layer is formed. A UV sheet) is adhered, and this is pressed against a nickel stamper to transfer pits of a recording signal from the stamper. The pits are cured by irradiating ultraviolet rays and then peeled off from the stamper to form a second recording layer. It is manufactured in the process of forming.
[0003]
FIG. 3 shows an outline of an apparatus for transferring pits by pressing a disk against a stamper in the optical disk manufacturing process.
That is, in this configuration, the nickel stamper 11 is placed on the stage with the pit formation surface facing upward, and the resin disk 10 with the UV sheet attached thereon is attached to the UV sheet. The disk 10 is pressed with the pressure pad 8 from above to press the disk 10 against the stamper 11 with the surface facing the stamper 11.
[0004]
The pressing pad 8 is made of a hard elastic material such as urethane rubber. The pressing pad 8 is lowered by a driving means such as an air cylinder to press the disk 10 and to press the disk 10 against the stamper 11. Are transferred to the UV sheet of the disk 10.
[0005]
A method of manufacturing an optical disk in which pits are transferred by pressing a disk against a stamper as described above is conventionally known, for example, in Patent Document 1 below.
[Patent Document 1]
JP-A-9-167385
[Problems to be solved by the invention]
Conventionally, in the above-mentioned pit transfer step, the disc and the stamper were simply pressed and pressed, so that various portions of the disc surface were randomly bonded to the stamper, and as a result, bubbles were formed between the stamper and the disc in a bag shape. You will be trapped. Such bubbles cannot be removed even if a large pressure is applied, and a serious defect that pits cannot be accurately transferred from the stamper to the disk due to the remaining bubbles occurs.
[0007]
The present invention has been made in view of such a problem, and it is possible to prevent bubbles from entering between a stamper and a disk in a pit transfer step of an optical disk, and to set a disk and a stamper that enables accurate pit transfer. It is intended to provide a method and apparatus.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides
A method of setting a disk and a stamper employed in a pit transfer step of an optical disk in which a disk is pressed against a stamper to transfer pits to the disk,
First, with the center part of the stamper placed on the set base and supported, the outer peripheral part of this stamper is depressed and warped,
In this state, press the center of the disc against the stamper from above the stamper to fix both positions,
The depression of the outer periphery of the stamper is released, and the warpage of the stamper is returned to make contact with the disk.
[0009]
Also, the present invention
A disc and stamper setting device employed in an optical disc pit transfer step of transferring a pit to a disc by pressing a disc against a stamper,
A set base that supports the center of the stamper,
First pressing means for pressing down and warping the outer peripheral portion of the stamper supported by the set table,
Second pressing means for pressing the center of the disc against the stamper from above the stamper in a state where the outer peripheral portion of the stamper is warped by the first pressing means;
With
After pressing the center of the disc against the stamper by the second pressing means to fix the positions of both,
The pressing of the outer peripheral portion of the stamper by the first pressing means is released, and the warpage of the stamper is returned to contact the disk.
[0010]
According to such a setting method and apparatus of the present invention, since the disc and the stamper gradually come in contact from the center toward the outer periphery, bubbles are not left in the meantime and are set in a favorable state. The pits are surely transferred at the time of pressure bonding by the subsequent pressurization.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
The disk 10 used here is a disc made of polycarbonate having an outer diameter of 120 mm and a thickness of 1.1 mm, and an ultra-thin UV sheet (not shown in the figure) is attached as a transfer layer on one surface thereof. . On the other hand, the stamper 11 is a 0.3 mm-thick nickel plate having a diameter at least one size larger than the disk.
A center hole is formed at the center of each of the disc 10 and the stamper 11, and the inner diameter of the center hole is 15 mm for the disc and 20 mm for the stamper.
[0012]
FIG. 1 shows a setting table on which a stamper is set.
The set table 1 is composed of a cylindrical center boss 2 having a two-stage structure. That is, the center boss 2 supports a large-diameter stamper support 3 for supporting the center of the stamper 11 and the center of the disk 10. The disk support portion 4 is coaxially provided with a small-diameter disk support portion 4, and the disk support portion 4 is incorporated in the fixed stamper support portion 3 so as to be vertically movable.
[0013]
Here, the disk supporting portion 4 has an outer diameter with which the center hole of the stamper 11 is fitted with almost no gap, and a tapered convex portion 4b with which the center hole of the disk 10 is fitted is formed on the upper surface thereof. .
[0014]
The disk support portion 4 is elastically protruded from the upper surface of the stamper support portion 3 by the force of a spring 5 incorporated in the center boss. When the disk is pressed from above as described later, the disk support portion 4 receives the force of the spring 5. It has a structure that pulls in against it.
[0015]
In order to set the disc 10 and the stamper 11 on the setting table 1, first, as shown in FIG. 2A, the stamper 11 is placed on the stamper support 3 of the setting table 1. In this case, the stamper 11 is set with its pit formation surface facing upward.
[0016]
At this time, the center portion of the stamper 11 is supported by the receiving surface 3a of the stamper support portion 3 in a state where the center hole of the center portion is fitted to the disc support portion 4 and is accurately centered.
[0017]
With the center portion of the stamper 11 supported on the set table 1 in this manner, the outer peripheral portion of the stamper 11 is pressed down by the first pressing means 6 as shown in FIG.
The first pressing means 6 moves up and down by, for example, a driving force of an air cylinder, and has a plurality of pins for pressing several points on the outer peripheral portion of the stamper 11 or a ring-shaped for pressing the outer peripheral portion of the stamper 11 over the entire circumference. When the first pressing means 6 is lowered to push down the outer peripheral portion of the stamper 11, the outer peripheral portion of the stamper 11 is warped downward as shown in the figure. The amount of warpage of the outer peripheral portion of the stamper 11 is about 3 to 5 mm.
[0018]
After the outer peripheral portion of the stamper 11 is warped in this way, the disk 10 is placed on the disk support portion 4 of the set table 1 as shown in FIG. In this case, the disc 10 is set with the surface to which the UV sheet is attached facing the stamper 11.
[0019]
At this time, the center portion of the disk 10 is supported by the receiving surface 4a of the disk support portion 4 in a state where the center hole at the center portion is fitted to the convex portion 4b and is accurately centered.
In this state, the disk 10 and the stamper 11 have not yet contacted.
[0020]
Then, with the disk 10 arranged above the stamper 11, the center of the disk 10 is pressed against the stamper 11 by the second pressing means 7 as shown in FIG.
The second pressing means 7 also moves up and down by a driving force of an air cylinder or the like, and a plurality of pins for pressing several points around the center hole of the disk 10 or around the center hole of the disk 10 over the entire circumference. The disk 10 is pressed down together with the disk support 4 by lowering the second pressing means 7 to press the center of the disk 10, and the center is pressed by the stamper 11. It is crimped.
[0021]
At this time, by lowering the second pressing means 7 to a position slightly lower than the height position where the disc 10 and the stamper 11 are in contact, the center of the disc 10 is strongly pressed against the stamper 11 and is securely pressed. .
In this state, only the center of the disk 10 and the stamper 11 is fixed by crimping, and the other parts are not in contact.
[0022]
After pressing the center portions of the disc 10 and the stamper 11 in this way to fix the positions thereof, the first pressing means 6 is gently lifted to release the lowering of the outer peripheral portion of the stamper 11 by the first pressing means 6. I do. Due to this, the warper gently returns to the original posture due to its own restoring force, and the stamper 11 is set in a state in which it comes into full contact with the disk 10 as shown in FIG.
When returning the warpage of the stamper 11, a mechanism for pushing up the outer peripheral portion of the stamper 11 may be provided as an auxiliary means.
[0023]
In the setting operation of the disc 10 and the stamper 11 as described above, the disc 10 and the stamper 11 gradually contact from the center toward the outer periphery as shown in FIGS. The air conditioner is set in a good condition without air bubbles remaining.
[0024]
In this set state, the disc 10 and the stamper 11 are set in a state where only the center portion is crimped and the other portions are in contact but not crimped, so that no air bubbles enter between them. .
[0025]
After the disk 10 and the stamper 11 are set as described above, the disk 10 is entirely pressed by the pressure pad 8 and pressed against the stamper 11 as shown in FIG. The pits are transferred to the UV sheet. At this time, since no air bubbles exist between the disk 10 and the stamper 11, accurate pit transfer is performed.
[0026]
After the pits are transferred to the UV sheet of the disk 10 in this manner, the disk 10 is irradiated with ultraviolet rays to cure the UV sheet, and then the disk 10 is peeled from the stamper 11.
Then, a protective sheet made of polycarbonate having a thickness of about 0.1 mm is attached to the pit transfer surface of the disk 10 in a subsequent step, and this is a completed optical disk.
[0027]
The embodiments of the present invention have been described above. However, it is needless to say that the present invention is not limited to the embodiments and can adopt various other embodiments.
[0028]
【The invention's effect】
As is apparent from the above description, according to the present invention, it is possible to avoid bubbles from entering between the stamper and the disc in the pit transfer step of the optical disc, so that accurate pit transfer is performed and the productivity of the optical disc is improved. Can make a significant contribution.
[Brief description of the drawings]
FIG. 1 is a vertical sectional side view showing a structure of a set table according to the present invention.
FIG. 2 is an explanatory diagram of a setting operation of a disc and a stamper.
FIG. 3 is an explanatory diagram of pressure bonding of a disc and a stamper by a pressure pad.
[Explanation of symbols]
1 set base 3 stamper support 4 disk support 6 first pressing means 7 second pressing means

Claims (3)

A method of setting a disk and a stamper employed in a pit transfer step of an optical disk in which a disk is pressed against a stamper to transfer pits to the disk,
First, with the center part of the stamper placed on the set base and supported, the outer peripheral part of this stamper is depressed and warped,
In this state, after pressing the center of the disc against the stamper from above the stamper to fix the positions of both,
Release the depression of the outer periphery of the stamper and return the warper of the stamper to contact the disk,
A method of setting a disc and a stamper in a pit transfer step of an optical disc. A disc and stamper setting device employed in an optical disc pit transfer step of transferring a pit to a disc by pressing a disc against a stamper,
A set base that supports the center of the stamper,
First pressing means for pressing down and warping the outer peripheral portion of the stamper supported by the set table,
Second pressing means for pressing the center of the disc against the stamper from above the stamper while the outer peripheral portion of the stamper is warped by the first pressing means;
With
After pressing the center of the disk against the stamper by the second pressing means to fix the positions of both,
The pressing of the outer peripheral portion of the stamper by the first pressing means is released, and the warpage of the stamper is returned to contact the disk.
A device for setting a disc and a stamper in the pit transfer process of an optical disc. In claim 2,
The set table has a disk supporting portion for supporting a central portion of the disk, and the disk supporting portion is retracted when the central portion of the disk is pressed against the stamper by the second pressing means.
A device for setting a disc and a stamper in the pit transfer process of an optical disc.

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