JPS62267938A - Production of optical disk substrate - Google Patents

Abstract

PURPOSE:To easily obtain a substrate which obviates sticking of a photosetting resin to a spacer adhering part and is faithfully transferred with the recording region of a master disk by embedding an excess resin curable by UV rays into the grooves formed to an inside peripheral part and outside peripheral part with the recording region of a replica substrate in-between and curing the resin. CONSTITUTION:The inside peripheral groove 11 and outside peripheral groove 12 are concentrically formed on the replica substrate 10. The resin 13 curable by UV rays is coated between the inside peripheral groove 11 and outside peripheral groove 12 on the replica substrate 10 and the recording master disk 14 is pressed thereto from above to uniformly spread the resin 13 curable by UV rays on the replica substrate 10. After the excess resin is embedded into the inside peripheral groove 11 and the outside peripheral groove 12, UV rays 15 are irradiated thereto from the replica substrate 10 side to cure the resin 13 curable by UV rays and finally the replica substrate 10 is stripped from the master disk 14, by which the recording region 16 is transferred from the master disk 14 and the optical disk substrate which is not stuck with the resin 13 curable by UV rays in the spacer adhering part 17 is obtd.

Description

[Detailed description of the invention] (Industrial application field) The invention relates to a method of manufacturing an original disk substrate.

(Prior art) As a conventional method for manufacturing an original disk substrate using the 2P (Photo-Polymer) method, Japanese Patent Application Laid-Open No. 60-2376
There are 54. In this method of manufacturing an optical disc substrate, the photocurable resin filled between the replica substrate and the recording master is uniformly spread, and the excess resin produced is forcibly sucked by vacuum suction means.

When manufacturing a laminated disk using spacers 18 as shown in FIG. 2, if the photocurable resin 19 adheres to the spacer adhesive part of one replica substrate 10 before the disks are laminated together, the disks will not be laminated together. Since the adhesive strength between the rear spacer 18 and the replica substrate 10 decreases, it is necessary to remove the excess photocurable resin 19 that gets into the spacer bonding area before bonding the disks together.

(Problems to be Solved by the Invention) In the conventional optical disc substrate manufacturing method described above, this excess resin is removed by vacuum suction, but at this time, a part of the resin necessary for transferring the recording part of the master is also suctioned. There was a problem in that the recorded portion of the master could not be faithfully transferred due to the removal.

An object of the present invention is to eliminate the above-mentioned problems, and to obtain a method for manufacturing an original disk substrate, which can obtain an optical disk substrate that faithfully transfers the recording area of the master disk without adhesion of photocuring resin to the adhesive part of the base plate. Our goal is to provide the following.

(Means for Solving the Problems) The method for manufacturing an optical disc substrate of the present invention includes a first step of forming concentric grooves on the inner and outer circumferential portions of the replica substrate across the recording area, and a second step of applying a photocurable resin between each groove on the inner circumference and the outer circumference;
The method includes a third step of pressing the recording master from above the replica substrate and irradiating resin curing light from below, and a fourth step of peeling off the replica substrate from the recording master.

(Function) Concentric grooves are provided on the inner and outer circumferential parts of the replica substrate, respectively, and a photocuring resin T-coating is inserted between each of the outer and inner circumferential parts. When pressing the recording master from above the replica substrate coated with photocurable resin and spreading the photocurable resin uniformly, the photocurable resin tends to ooze out on the outside and inside of the disk.

By embedding this surplus resin in the grooves formed on the outer circumferential part and the inner circumferential part, and curing the photocurable resin by irradiating resin curing light from below, It is possible to easily prevent excess photocurable resin from adhering to the spacer adhesion portions present inside the grooves, and moreover, it is possible to accurately transfer the recording portion of the master onto the replica substrate.

(Example) Next, an example of the present invention will be described with reference to the drawings.

FIGS. 1(a) to 1(d) are cross-sectional views of an optical disk substrate showing an embodiment of the present invention in the order of steps.

As shown in FIG. 1(a), inner circumferential grooves 11 and outer circumferential grooves 12 were formed concentrically at positions with a diameter of 122 u and a diameter of 38 mm, respectively, on a replica substrate 10 having an outer diameter of 130 mm.

Both the inner circumferential groove 11 and the outer circumferential groove 12 have a width of 1.51ri.
The groove had a rectangular cross section with a depth of 0.50 and a depth of 0.50.

Next, as shown in FIG. 1b), approximately 1 cc of ultraviolet curing resin 13 is applied to the inner circumferential groove 11 and outer circumferential groove 1 on the replica substrate 10.
2, and as shown in FIG. 1(C), record master 1.
4 from above with a load of 5 kg, and UV curing resin 1
3 was uniformly spread on the replica substrate 10, and the excess resin was embedded in the inner groove 11 and the outer periphery 412, and then ultraviolet rays 15 were irradiated from the replica substrate 10 side to cure the ultraviolet curing resin 13.

Finally, as shown in FIG.
By peeling off the recording area 16 from the recording master 14
was transferred from the recording master disk 14, and an original disk substrate was obtained in which no ultraviolet curing resin 13 was attached to the spacer adhesive portion 17.

Note that in one embodiment of the present invention, the inner circumferential groove 11 and the outer circumferential groove 1
2 was formed one by one, but the same effect can be obtained even if several pieces are formed each.

(Effects of the Invention) As explained above, the method for manufacturing the original disk substrate of the present invention embeds excess photocurable resin into the grooves formed on the inner and outer circumferences of the replica substrate, sandwiching the recording area. By curing, there is no adhesion of the photocurable resin to the spacer adhesive portion, and it is possible to easily obtain an optical disc substrate on which the recording area of the master is faithfully transferred.

[Brief explanation of drawings]

FIGS. 1(a) to 1(d) are cross-sectional views of an optical disk showing an embodiment of the present invention in the order of steps, and FIG. 2 is a cross-sectional view of a bonded optical disk using spacers. 10... Replica board, 11... Inner circumferential groove, 12... Outer circumferential groove, 13... Ultraviolet curing resin, 14... Recording Original, 15...
・Ultraviolet rays, 16・Old recording area, 17・・・Spacer adhesion part, 18・River spacer, 19・・・・・・・
・Photosetting resin. \Goshi/ Figure I Figure Z

Claims (1)

[Claims] A first step of forming concentric grooves on the inner and outer peripheries of the replica substrate across the recording area, and a second step of applying a photocurable resin between the grooves on the inner and outer peripheries. a second step, a third step of pressing the recording master from above the replica substrate and irradiating resin curing light from below, and a fourth step of peeling the replica substrate from the recording master. A method for manufacturing an optical disc substrate.