JPH03225646A - Production of stamper - Google Patents

Abstract

PURPOSE:To stably produce a reproduced disk substrate which has good flatness and has excellent mechanical characteristics by sticking the roughened rear of a die stamper and the specular-finish surface of a reinforcing material by using an anaerobic adhesive. CONSTITUTION:The rear of the die stamper 1 formed with pits, guide groove, etc., is subjected to the surface roughening treatment of about 2 mum roughness. The surface is protected by an electrosheet 5, etc., and the stamper is placed on a turn table 6 while the stamper is positioned by using a centering collar 7. A specified amt. of the anaerobic resin 8 is then applied in the middle peripheral part of the rear of the stamper 1. While the stamper is positioned by using the collar 7, the specular-finish reinforcing material 4 consisting of a metal, such s stainless steel, is stuck thereto and is rested to allow the resin 8 to cure. The reproduced disk having excellent flatness and mechanical characteristics is stably obtd. by using the stamper 1 stuck in such a manner and molding the disk by a photopolymer (2P) method.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a manufacturing method for obtaining a duplicated disk from a mold for duplicating an information recording carrier using a liquid molding resin that can be cured by ultraviolet irradiation, so-called photopolymer (2P). The present invention relates to a method for fixing a mold for duplicating an information recording carrier in accordance with the law.

(Prior Art) A substrate used for an information recording carrier has information patterns such as necessary guide grooves and bits formed in advance.

Although there are several methods for forming this information pattern, the 2P method is being actively studied because it can provide a high quality substrate.

In this 2P method, an ultraviolet curable resin is filled between a mold standber and a transparent substrate, and then ultraviolet rays are irradiated to cure the ultraviolet curable resin. Thereafter, the mold is released from the mold stamper to obtain a substrate for an information recording carrier. The conventional 2P method will be further explained below with reference to FIG.

In FIG. 2, the die stand bar 1 is a thin Ni plate formed by electroforming or the like with pits, guide grooves, etc. in an uneven shape on its surface, and has a thickness of 200 to 30011 m.

2 transfers the shape recorded on the stamper 1 onto a disc-shaped transparent substrate 3 using an ultraviolet curable resin coated on the mold stamper 1 in a circumferential manner. 9 is a vacuum suction port for fixing the stamper 1, and 10 is a vacuum generator.

A predetermined amount of ultraviolet curable resin 2 is applied to the middle circumferential portion of mold standber 1 using a dispenser or the like. Next, in order to suppress the generation of bubbles, the substrate is tilted and brought into contact with the resin at the negative point. Thereafter, while aligning the substrate, the contact area between the substrate and the resin is gradually increased. After contact is completed in a circumferential manner, pressure is applied to spread the resin over the entire surface of the substrate. In this state, ultraviolet rays are irradiated from the transparent substrate 3 side to cure the resin. Finally, mold stamper
The transparent substrate 3 and the cured ultraviolet curing resin 2 are released from the mold to obtain a duplicate disk.

(Problems to be Solved by the Invention) However, in the conventional method of fixing the mold stamper by vacuum suction, the entire surface of the mold stamper was not vacuum-sucked uniformly, and the flatness of the stamper surface was not ensured. For this reason, the film thickness of the ultraviolet curing resin applied to the stamper surface was not uniform, resulting in a duplicate disk with poor mechanical properties.

There are other ways to fix the stamper, such as magnetic adsorption and mechanical fixation, but these have the problems of being a bulky device, not being fixed uniformly over the entire surface, and not ensuring sufficient flatness. . There is also a method of applying UV-curable resin to the entire back surface of the stamper and gluing glass to it as a reinforcing material, but this method has problems such as the glass used as a reinforcing material being easily broken and difficult to process.

An object of the present invention is to provide a mold stamper with good flatness with good reproducibility and to stably provide a replicated disk substrate with excellent mechanical properties when manufacturing a high quality substrate using the 2P method.

(Means for Solving the Problems) The present invention is characterized in that the roughened back surface of the mold stamper and the mirror-finished surface of the reinforcing material are bonded together using an anaerobic adhesive.

(Function) In the present invention, a metal plate whose surface in contact with the mold stamper surface has been mechanically processed to have good flatness is bonded to the mold stamper using, for example, an anaerobic adhesive resin. . By using this integrated stamper, a surface with good flatness was obtained, and the mechanical properties of the replicated disk substrate were also improved.

In addition, by making the back surface of the mold stamper rough, we were able to improve adhesion to the resin, slow down the flow rate of the resin, and suppress the generation of bubbles.

Since a %-resistant resin is used, the protruding resin remains uncured and can be easily removed by wiping it off afterwards.

Next, the 2P manufacturing method of the present invention will be explained using the drawings.

(Example) FIG. 1 is a schematic diagram for explaining the present invention in detail.

Reference numeral 1 denotes a mold stamper on which bits, guide grooves, etc. are formed in an uneven shape by electroforming or the like on the front surface, and the back surface is roughened to a roughness of about 2 μm. The surface is protected by, for example, an electron sheet 5 or the like. This mold stamper is placed on a rotary table 6 while being aligned using a centering collar 7. Next, apply a viscosity of 100c to the middle circumference of the back of the stamper.
A certain amount of anaerobic resin 8 of about ps is applied. Do not align using centering collar 7 on top of this.
A reinforcing material made of metal such as stainless steel is attached. The surface of this reinforcing material that comes into contact with the mold stamper surface is mirror-finished with a surface finish accuracy of 0.5 μm or less. Leave the bonded parts together for a day and night to allow the resin to harden.

Next, 2P molding is performed in the same manner as in the past using the bonded mold stamper.

The replicated substrate that was 2P molded using the stamper fixing method of the present invention was 2P molded using the conventional vacuum fixing method.
A replicated substrate with good mechanical properties and no unevenness in the P resin film thickness was obtained. Moreover, even after repeated molding, the flatness of the mold stamper did not deteriorate.

(Effects of the Invention) As explained above, according to the manufacturing method of the present invention, a mold stamper with good flatness was obtained. Therefore, the replicated substrate molded using this mold stamper had good uniformity in resin film thickness and excellent mechanical properties.

Since a mold stamper with a roughened back surface is used, the adhesion to the bonding resin is improved, allowing repeated use, and the flatness of the bonded mold stamper is also improved.

[Brief explanation of drawings]

FIG. 1 is a process diagram for explaining a first embodiment of the present invention, and FIG. 2 is a process diagram for explaining a conventional method for manufacturing a duplicate disk. In the figure, 1 is a mold stamper with pits, guide grooves, etc. formed in an uneven shape on the surface, 2 is an ultraviolet curing resin, 3 is a disc-shaped transparent substrate, 4 is a reinforcing material made of metal such as stainless steel, and 5
is an electron sheet to protect the surface of the gold stamper, 6 is a rotary table, 7 is a centering collar, 8 is an anaerobic resin,
9 is a vacuum suction port, and 1o is a vacuum generator.

Claims (1)

[Claims] A method for producing a stamper, which comprises bonding the roughened back surface of a mold stamper and the mirror-finished surface of a reinforcing material used to reinforce the mechanical strength of the stamper using an anaerobic adhesive.