JPS61220150A - Forming method for guide groove on optical storage disc - Google Patents

Abstract

PURPOSE:To form a guide groove of an optical disc on a prescribed surface of a substrate with high dimension precision by arranging light shielding cylinder bodies between a light irradiating source and the disc substrate. CONSTITUTION:Before irradiation of ultraviolet rays, a mask 16 is placed on the inside peripheral part of the substrate where it is unnecessary to stick a resin, and a shielding mask 17 having the same shape as the outside peripheral part of the substrate is placed on the outside peripheral part of the substrate, and a mask 9 is placed to be brought closely into contact with the outside of the mask 17. The mask 9 on the outside peripheral part 9 consists of concentrical cylinder bodies, and front and rear faces of three cylinder bodies are painted black to intercept the incident light from the peripheral part of an irradiating source 15 or the like. These light shielding masks are brought closely into contact with the substrate, and ultraviolet rays are irradiated from the light source in this state. A molded body is detached and the disc substrate is washed with ethanol thereafter to obtain the substrate on which the guide groove having a very sharp end part of the cured resin is formed. Thus, the resin hardened by light is stuck to only the required part of the substrate, and the boundary between the cured resin and the unhardened resin is distinct to improve the outward appearance after working, and the disc is assembled smoothly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for forming guide grooves on an optical storage disk, which is related to a method for manufacturing a storage medium disk for recording and reproducing information using light or light and magnetism.

FIG. 3 is a cross-sectional view of the optical storage disk assembly.

In the figure, 21 and 22 are disk substrates with an information recording surface formed on one side of a material such as glass, 23 is a spacer ring inserted between the substrates 21 and 22 on the center side of the substrate, and 24 is a substrate. Spacer ring inserted on the outer circumferential side,
and 25 is a through hole in the substrate.

On the substrate surfaces 18 and 19 facing the gap 26 of the disk substrate of the assembly, optical head guide grooves (tracks), which are stamp-molded (not shown), are formed.

The molding guide grooves are spacer rings 23 and 2 inserted between the boards.
It is necessary to form the film to have a uniform thickness within the surface of the substrate except for at four locations.

[Conventional technology]

FIG. 2 is a simplified side sectional view of an apparatus for forming guide grooves on the substrate surface, excluding the center and outer peripheral portions of the disk substrate.

For example, a disk substrate with a diameter of 300 °C, 21 (or 22
), a guide groove 11 is formed through a layer 12 coated with resin.
A stamp molded body 10 having the following is arranged.

Above the disk substrate is the ultraviolet curing resin Fi12.
A light irradiation source 15 and a light reflection plate 13 are arranged for the light irradiation. Further, a shielding mask 16 and a mask 17 for the irradiation source 15 are placed at the center and outer circumference of the irradiation target substrate 21 .

Then, when the molded body 10 is stamped and pressed against the disk substrate 21 side and the perpendicular light 14 from the irradiation source is applied to harden the resin JW 12, fine irregularities are formed on the substrate surface as shown in Fig. 2. The groove is fixed.

The resin layer 12 on the mask-covered portion of the substrate 21 was not photocured.

If this is used and washed with ethanol after being irradiated with light, guide grooves will be formed only on the predetermined substrate surface.

[Problem that the invention seeks to solve]

However, regardless of the cleaning and removal described above, semi-hardened or hardened resin remains on the portion of the outer periphery of the disk substrate that is contacted and shielded by the mask 17, for example.

The problem is that masks aren't working properly. As a result, the remaining resin poses a problem in subsequent assembly. In other words, the guide groove of the optical disk and the predetermined surface of the substrate must be formed with high dimensional accuracy.

[Means for solving problems]

The above problem is.

Molding of an optical disc guide groove using the photocurable resin, comprising a light irradiation source for the photocurable resin, and a guide groove forming mold body that stamps the photocurable resin onto the substrate through the adhered resin layer of the disk substrate. This problem is solved by the method of forming a guide groove for a disk substrate according to the present invention, in which a light-shielding cylindrical body is disposed between the light irradiation source and the disk substrate in addition to the conventional shielding mask.

[For production]

The light shielding cylindrical body placed between the light irradiation source and the disk substrate blocks obliquely incident light from the irradiation light source or scattered light from the outside.

The edge of the boundary between cured and uncured resin becomes clear. As a result,
The surface smoothness of the outer peripheral surface of the substrate is maintained, making it easy to attach the spacer ring.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to a simplified side sectional view of a head guide groove forming apparatus for an optical storage disk shown in FIG.

In the figure, the same reference numerals as in FIG. 2 are given to the main components of the device that are the same as those of the conventional device, so as to make the gist of the present invention clear.

The example diagram shows a substrate inner diameter of 3511. A separate drawing shows a disk substrate 21 (or 22) with an outer diameter of 305 mm and a thickness of 1.5 cm, with a guide groove formed on the inner periphery of a resin layer having a width of 1 ON and an outer periphery of a resin layer with a fine unevenness except for the substrate surface with a width of Lots. be.

The guide groove molded body 10 has an uneven surface 11 plated with a shiny metal such as nickel.

An ultraviolet curing resin (manufactured by Mitsubishi Yuka Fine Co., Ltd. 5A2006) 12 is uniformly spread on the uneven metal plating surface, and a substrate 21 (or 22) to be processed is placed.

For ultraviolet irradiation, a mask 16. with a diameter of 551 nm is first placed on the inner circumference of the substrate, which does not require resin coating. And a shielding mask 17 of the same shape as the conventional one (inner diameter 295, outer diameter 3Q5n
*), and then place the mask 9 in close contact with the outside thereof.

The outer peripheral mask 9 is a concentric cylindrical body with a height of 5ON, a thickness of 0.2n+, and three diameters of 295.290 and 280 am, respectively. Since the front and back surfaces of the three cylindrical bodies are painted black, incident light from the vicinity of the irradiation source 15 is blocked.

With such a light shielding mask in close contact with the substrate, ultraviolet rays are irradiated with a light source (UV-1503 manufactured by Ushio Inc.). After that, if the molded body is removed and the disk substrate is cleaned with ethanol, the surface of the substrate will be removed.

The outer circumferential dimensions of the cured resin that will be molded into the guide groove are outer diameter 2951,
A guide groove with an extremely sharp inner diameter 5511 resin hardened end is formed.

Among the three masks 9 shown in the above embodiment, the cylindrical body with a diameter of 280 cm may be omitted, but the edges of the cured and uncured resin lack sharpness and become unsightly.

Although the above-mentioned embodiment of applying a concavo-convex guide groove pattern using a light-shielding mask uses a cylindrical mask corresponding to the shape of the disk substrate, various modifications of the mask can be considered depending on the shape of the processed substrate. Further, the height, number, etc. of the mask are only examples.

〔Effect of the invention〕

According to the head guide groove forming method for an optical storage disk of the present invention described in detail above, the photocuring resin is applied only to the necessary portions of the substrate, and the boundary between cured and uncured resin is clear, and after processing, The appearance is also good.

This is highly effective because subsequent disk assembly can be carried out smoothly.

[Brief explanation of drawings]

FIG. 1 is a simplified side sectional view of an embodiment of a head guide groove forming device for an optical storage disk according to the present invention. FIG. 2 is a simplified side sectional view of a conventional guide groove forming device. FIG. 3 is a cross-sectional view of the optical storage disk assembly. In the figure, reference numeral 9 indicates a light shield (mask), a cylindrical body 10 indicates a guide groove molding mold body 11, an optical disc guide groove 12 indicates a light irradiation curing resin (spreading layer), and 15 indicates light irradiation sources 21 and 22 a disk substrate. Te (Bip and l Mizokanzu magazine) 1v! Urzuyo is moi 1
Figure 1 (Yi 1shi Il'lig Figure) 1st Figure

Claims (1)

[Claims] An optical disc guide using the photocurable resin, comprising a light irradiation source for the photocurable resin, a disk substrate on which the photocurable resin is adhered, and a guide groove molded body that presses the substrate side through the resin adhesion layer of the substrate. A method for forming a guide groove for an optical storage disk, characterized in that, in forming the groove, a light-shielding cylindrical body is placed between the light irradiation source and the disk substrate.