JP2000076711A - Manufacturing device for sticking type optical disk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a manufacturing device for a sticking type optical disk with which the sticking type optical disk less in warpage and excellent in mechanical characteristics is manufactured. SOLUTION: The manufacturing device for the sticking type optical disk is provided with a supporting base 3 on which two sheets of disk substrate, on at least one side of which a recording layer is formed, are set by being superimposed via an adhesive member 10, a pressurizing means 6, which pressurizes and sticks the disk substrates set on the supporting base 3, and a uniformizing means, which makes the sticking state of the stuck disk substrates uniform. In this manufacturing device for the sticking type optical disk, the supporting surface 36 of the supporting base 3 is formed a truncated cone shape having a slope with an inclined angle of 0.2 to 5 degrees and the pressurizing part 6a of the pressurizing means 6 is formed to a semi-spherical shape.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing a bonded optical disk in which two disk substrates are bonded, and more particularly, to warpage and runout when pressing and bonding two disk substrates. The present invention relates to an apparatus for manufacturing a bonded optical disk capable of correcting the above.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing a bonded high-density optical disk in which two disk substrates are bonded together, an adhesive is applied to one of the two disk substrates on a turntable. Alternatively, there has been known a method of laminating a disc substrate manufactured by laminating and then pressing another one on an adhesive.

Usually, such a bonding method is such that one of the two disk substrates is placed on a support for the disk substrate on the turntable, the turntable is rotated, and the next fixed position is set. Apply or paste the adhesive,
Further, another one is superimposed thereon, pressed, and further pressurized by an autoclave to produce a bonded product of a high-density optical disc, which is subjected to post-processing and used as a product.

FIG. 1 shows an example of a manufacturing apparatus for continuously manufacturing such a bonding type high-density optical disk by bonding disk substrates.

In this manufacturing apparatus, the turntable 1
Then, one of the two disk substrates 9a to be bonded by the first substrate supply means 2 at a fixed position is automatically set on the disk substrate support base 3 on the turntable 1. By rotating the turntable 1, automatic supply of the disk substrate 9a can be repeated.

By rotating the turntable 1, the support 3 for the disk substrate is moved to the adhesion applying means 4, and the adhesion applying means 4 applies the adhesive member 10 for bonding to the disk substrate 9a. Specifically, by applying an adhesive or pressing the adhesive applied on the sheet to the disk substrate 9a from the center with a hemispherical rubber from the sheet, the air is applied so as not to entangle the air into the adhesive portion. Then, the adhesive member 10 is applied to the disk substrate 9a.

After that, the turntable 1 is further rotated, and another disk substrate 9 is rotated at the next station.
b from the second substrate supply means 5 on the adhesive applied surface of the disk substrate 9a.

Thereafter, the turntable 1 is rotated to transfer the disk substrates 9a and 9b superimposed on the support table 3 to the pressing position of the pressing means 6 having a pressing portion 6a made of hemispherical rubber as shown in FIG. I do. The pressing means 6 presses the pressing portion 6a from above the two stacked disk substrates 9a and 9b with the pressing air cylinder 8, thereby pushing out the air from the inner peripheral side to the outer peripheral side so that the two disk substrates 9a are pushed out. ,
9b is laminated.

The bonded optical disk 11 on which the two disk substrates 9a and 9b are bonded is rotated on the turntable 1 and transferred to the next autoclave 7. In the autoclave 7, the bonded optical disks 11 are evenly pressed with the pressure of the compressed air of about 1 ton to make the bonding state more uniform. Thereafter, the table 1 is further rotated, and the bonded optical disk 11 is taken out as a product by the first substrate supply means 5.

At this time, as shown in FIG. 4, the support base 3 for the disk substrate installed on the conventional turntable has a flat disk support surface, and the two disk substrates are then moved from above. Due to the pressing, the resulting high-density optical disk always warps, and the amount of warping is about 0.2 to 0.4 degrees as the inclination angle of the straight line connecting the center and the periphery.

Further, in order to reduce air entrainment at the time of bonding, it is general to bond two disk substrates by combining disk substrates 9a and 9b whose warpage is adjusted as shown in FIG. I have.

As a measure for reducing the warpage of the bonded optical disks, the warpage of the disk substrate installed at the lower part of the two disk substrates is made larger by a certain amount than that of the disk substrate installed at the upper part. Although it is possible to adjust the warpage of the optical disk, it is necessary to consider all of the film forming and storage methods, time, and the like, and it is not easy to control the warp of the optical disk.

Further, when the warpage of the disk substrate is increased, the surface runout is increased and the variation is increased.
The state after lamination of two disk substrates also changes greatly, and the failure rate in mechanical characteristics such as acceleration increases.

For this reason, the warpage of the bonded optical disk product is adjusted to the limit of the upper limit of the specification. I have.

[0015]

The current high-density optical disk generally uses a method in which two disk substrates are bonded and used. For this reason, many devices have been developed for laminating, but broadly classified are a method of directly applying an adhesive on a disk substrate and a method of applying an adhesive applied on a sheet to a disk substrate.

In these methods, one of two disk substrates to be bonded to a support for a disk substrate mounted on a turntable is installed, an adhesive is applied or bonded, and the other is mounted. A high-density optical disk is manufactured by stacking it on top of it and pressing it, but the support surface of the support base of the disk substrate is flat, and the hemispherical rubber presses it from the center, so the center part is pressed. It is merely a physical matter that the force is increased and the pressing side is warped. For this reason, as described above, a method is used in which the warpage of the two disk substrates is changed. However, due to a management problem and a large variation in surface runout and warpage caused by increasing the warpage, two disk substrates are used. The state after lamination of the disk substrate is bad, and many problems occur after lamination.

[0017]

As a result of diligent studies on such a problem, as a result of the study, a direction opposite to the warpage after the two disk substrates are bonded, in other words, on the inner peripheral side of the support of the disk substrate. Into a frusto-conical shape with high and low outer circumference. In other words, the present invention provides a support base on which two disk substrates each having a recording layer formed on at least one of them are set by being stacked via an adhesive member, and pressing and attaching the disk substrate set on the support base. In a manufacturing apparatus for a laminated optical disk, comprising: a pressing means for bonding, and a uniforming means for equalizing a bonding state of the bonded disk substrates.
An apparatus for manufacturing a laminated optical disc, wherein a support surface of the support table is formed in a truncated cone shape with a slope angle of 0.2 to 5 degrees, and a pressing portion of the pressing means is formed in a hemispherical shape.

According to the above-described present invention, the warpage of the disk substrate obtained by laminating two disk substrate supports is set to 0.2.
A tilted optical disk having an inclination of up to 5 degrees and a warpage of the two sheets being brought close to zero by means of equalizing such as pressing, and as a result, surface runout etc. can be reduced, and the mechanical properties as a whole are excellent. Can be obtained.

In the present invention, the disk substrate can be continuously bonded by installing the support base on which the disk substrate is mounted on a transfer means such as a turntable. Can be manufactured.

In addition, as a material for the disk substrate, an inorganic glass, in addition to a synthetic resin such as acryl, polycarbonate, epoxy, amorphous olefin, or a copolymer thereof can be used.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION In the apparatus for manufacturing a bonded optical disk of the present invention, one of two disk substrates is mounted on a support for a disk substrate mounted on a transfer means such as a turntable and bonded. An agent is applied or affixed, and then another disk substrate is overlaid on the adhesive, and further pressed to produce a high-density optical disk.

When the two disc substrates are pressed together, they are pressed by hemispherical rubber, so that the pressure on the inner peripheral portion increases and the disk substrates warp to the pressing side. That is, if pressed from above, upward warpage occurs.
As a countermeasure, the tilt of the support surface of the support of the disk substrate in the direction in which the warp is corrected, that is, in the minus direction, cancels the warp when pressing the disk substrate. As a result, warpage can be reduced to near zero, surface runout can be greatly improved, and an excellent high-density optical disk can be manufactured.

Here, an apparatus for manufacturing a laminated disk according to the present invention will be described in detail with reference to a configuration suitable for continuous production shown in FIG.

The device shown in the figure is of a turntable type, and a first fixed position with respect to the turntable 1 is shown.
The substrate supply means 2 described above automatically sets one of the two disk substrates 9a to be bonded to the support 3 of the disk substrate on the turntable 1. Then, by rotating the turntable 1, the disk substrate 9a
The automatic supply is repeated. As shown in FIG. 3, the support surface of the support base 3 has a column 3a inserted into the center hole of the disk substrates 9a and 9b at the center, and the support surface 3b supporting the disk substrate 9a is Is formed in the shape of a truncated cone with an inclined surface having a predetermined inclination angle such that the warpage becomes zero.

When the turntable 1 is rotated, an adhesive member 10 is applied to the disk substrate 9a by the adhesive applying means 4 at the next station. Specifically, the adhesive applied or the adhesive applied on the sheet is applied to the sheet. The disc member 9 is provided with an adhesive member 10 by pressing the disc substrate 9a from the center with a hemispherical rubber from above and applying air so as not to be wound around the sticking portion. At this time, the disk substrate 9a slightly warps on the adhesive side due to the contraction of the adhesive or the pressing from above, but the disk substrate 9a
Is set in the minus direction so as to become zero on the bonded optical disk 11 as described above, so that the warpage after pressing the disk substrate 9 of this station is negative.

After that, the turntable 1 is further rotated, and the other one of the disk substrates 9 is
b on the adhesive-applied surface of the disk substrate 9a.

Thereafter, the tar table 1 is moved and moved to the pressing position of the pressing means 6. The pressing means 6 comprises a pressing portion 6a made of hemispherical rubber and a cylinder 8 for driving the pressing portion 6a as shown in FIG.
The two disk substrates 9a and 9b are bonded to each other by pushing the air from the inner peripheral portion to the outer peripheral portion by pressing from above the a and 9b with the pressing portion 6a. In this case, the inclination of the support surface 3b of the support 3 of the disk substrate is equal to the disk substrates 9a and 9b.
The inclination of the support surface 3b of the support 3 of the disk substrate, in which the warp of the product optical disk 11 after bonding is close to zero due to the conditions of molding and bonding of the disk substrate, that is, the support surface 3b of the support 3 of the disk substrate Set one that is tilted in the negative direction by 0.2 to 5 degrees.

The bonded optical disk 11 is moved to the next set position of the autoclave 7 of the equalizing means. The autoclave 7 presses the optical disk 11 evenly with the pressure of the compressed air of about 1 ton to make the state of the bonded portion of the optical disk 11 more uniform.

Thereafter, the product optical disk 11 bonded by further moving the turntable 1 is supplied with the disk substrate 9a by the first substrate supply device 2, and at the same time, the product optical disk 11 is taken out.

At this time, the present apparatus will be described in more detail. To be more specific, the three positions for pressing one and two disk substrates 9a and 9b on the turntable 1, namely, the adhesion applying means 4, the pressing means 6, and the autoclave 7, are used. Then, the support 3 of the disk substrate is tilted in the negative direction by 0.2 to 5 degrees and pressed to correct the warp so that the two disk substrates 9 bonded to each other approach zero. That is, by tilting the support 3 of the disk substrate in the minus direction, the adhesive
Direction to correct the shrinkage of the
In the pressing after the lamination of steps 9a and 9b, the central portion is strongly pressurized and warps to the pressing side. Therefore, the tilt is canceled by tilting the support 3 of the disk substrate in the minus direction.

Thereafter, the optical disk 1 is placed in the autoclave chamber 7.
Although the pressure is applied so that the bonded portions 1 are equal, the support 3 of the disk substrate is further pressed in the minus direction because of the continuity, so that the product optical disk 11 approaches zero.

Since the amount of warpage correction at these three locations changes depending on the molding conditions of the disk substrates 9a and 9b and the bonding conditions, the disk substrate support base such that the warpage after bonding becomes zero. The inclination of the support surface 3b is set. As the support 3 for the disk substrate, one having a support surface 3b with an inclination angle of 0.2 to 5 degrees is usually used.

There is a method equivalent to the above, in which the products are transferred without rotating the table, and the bonding is performed. In this case, the inclination of the support of the disk substrate is determined by the pressing of the respective substrates. It can be changed depending on the state.

FIG. 2 shows a transfer means using a conveyor system unlike FIG. Except for the transfer means, other configurations are the same as those in FIG.

That is, as shown in FIG.
The support 3 for the disk substrate installed on the disk substrate is the same as that of the above-described turntable.
From the first substrate supply means 2 of FIG. 1A to the adhesion applying means of the adhesive member 10, the second substrate supply means on which the other disk substrate 9b is stacked, the pressing means 6 and the autoclave 7, the circular processing is performed in a straight line. The configuration is the same as that of FIG. 1 except that the product take-out means 12 is provided.

In these devices, pressing is performed with a hemispherical rubber as a measure against air entrapment. Since warpage occurs on the pressing side, the support 3 of the disk substrate is inclined by 0.2 to 5 degrees in the minus direction. The warpage is corrected, and the runout can be reduced.

In other words, two disk substrates having a constant warpage controlled at the time of molding are used. In consideration of the amount of shrinkage of the adhesive, if the conditions of pressing and pressing become constant, the disk is Since the warpage after bonding the substrates is equal, it is possible to determine the inclination of the support of the disk substrate so that the warpage of the finished product approaches zero.

A high-density optical disk formed by these devices not only reduces the warp to zero, but also reduces the surface runout, and provides an apparatus for manufacturing a bonded optical disk having excellent mechanical properties. Hereinafter, a production example according to the present invention will be described.

[0039]

Manufacturing Example 1 A manufacturing example using a turntable type manufacturing apparatus shown in FIG. 1 which is an embodiment of the present invention will be described. With this apparatus, under the conditions of the disk substrates 9a and 9b in which the warp of the bonded optical disk 11 becomes 0.4 degrees upward (plus side) in FIG. The support surface 3b is tilted downward (minus side) by one degree as shown in FIG.
9b was laminated. As a result, the warpage was almost zero, and even if there was a variation in the molding of the disk substrates 9a and 9b, the warpage was within 0.2 degrees, satisfying the standard and eliminating defective products due to the warpage. As a result, the surface runout is reduced to half that of the conventional one, the mechanical properties such as acceleration are improved, and a suitable high-density optical disk can be provided.

[0040]

[Manufacturing Example 2] In the same apparatus as in Manufacturing Example 1, the warpage of the disk substrates 9a and 9b is different from that of FIG.
The disk substrate used was 0.2 degrees on the support base side and 0.4 degrees on the pressed side. Then, since it changes greatly to the pressing side, the support 3
Was bonded by using the support surface having an inclination of 2 degrees. Although the product was in a slightly negative direction, a product near zero was made.

[0041]

As described above, according to the present invention, in a device using a turntable or a conveyor system, the support surface of a disk substrate to which two disk substrates are bonded is inclined at an inclination angle of 0.2 to 5 degrees. By making the inclined surface into a truncated conical shape, the warpage due to lamination can be made close to zero, and a laminated optical disk that does not hinder practical use can be manufactured. As a result, an apparatus for manufacturing a laminated optical disk suitable for manufacturing a high-density optical disk excellent in mechanical characteristics such as acceleration and the like is reduced to about 1/2.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a configuration of a manufacturing apparatus for a turntable type laminated optical disk.

FIG. 2 is an explanatory diagram of a configuration of a manufacturing apparatus for a conveyer-type bonded optical disk.

FIG. 3 is a detailed explanatory view of a pressing means of the manufacturing apparatus of the present invention.

FIG. 4 is a detailed explanatory view of a pressing means of a conventional manufacturing apparatus.

FIG. 5 is an explanatory diagram of a warped state of the disk substrate before bonding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Turntable 1a Conveyor 2 1st board supply means 3 Support stand 4 Adhesion provision means 5 2nd board supply means 6 Pressing means 7 Autoclave 8 Press cylinder 9a, 9b Disk substrate 10 Adhesive member 11 Laminated optical disk 12 Disk substrate removal means

Claims (5)

[Claims] A recording layer formed on at least one of the recording layers;
A support table on which a plurality of disk substrates are stacked via an adhesive member, a pressing unit for pressing and bonding the disk substrates set on the support table, and a bonding state of the bonded disk substrates. In the apparatus for manufacturing a laminated optical disk provided with a uniformizing means for uniforming, a support surface of the support base is formed into a truncated cone with a slope angle of 0.2 to 5 degrees, and a pressing portion of the pressing means is a hemisphere. An apparatus for manufacturing a laminated optical disk, comprising: 2. The method according to claim 1, wherein a plurality of the supports are provided on a transfer means,
2. The apparatus for manufacturing a bonded optical disk according to claim 1, wherein the support table is sequentially transferred to a pressing position of the pressing means and a set position of the equalizing means so as to be bonded. 3. A substrate supply means for setting one of the disk substrates to be bonded on a support table along with the transfer means, an adhesion applying means for applying an adhesive member to the disk substrate on the support table,
Second substrate supply means for setting the other disk substrate on the disk substrate to which the adhesive member has been provided, the pressing means,
3. The apparatus for manufacturing a bonded optical disk according to claim 2, wherein said equalizing means are arranged at predetermined intervals, and said means is successively and intermittently transferred by means of a transfer means to continuously manufacture a bonded disk. 4. The apparatus for manufacturing a bonded optical disk according to claim 3, wherein said equalizing means is an autoclave for equalizing the bonded state of the bonded disk substrates by air pressure. 5. The apparatus according to claim 2, wherein the transfer means is a turntable or a conveyor.