JP2632062B2 - Optical disc manufacturing method - Google Patents

Description

The present invention relates to a method of manufacturing an optical disk used as, for example, an external recording medium of a computer system, and more particularly to a method of manufacturing a pair of optical disks having an optical recording surface on one surface of a transparent disk substrate. The present invention relates to a method for manufacturing an optical disk in which optical recording surfaces of optical disks are bonded to each other in a state of facing each other.

[Prior Art] FIG. 3 shows steps of a conventional method of manufacturing a magneto-optical disk, and the method of manufacturing a magneto-optical disk will be described with reference to FIG.

First, as shown in the step (1), a UV curable resin B is applied dropwise on the stamper A in a ring shape.

Next, as shown in step (2), a transparent glass disk substrate C is placed on the ultraviolet curing resin B on the stamper A, and the ultraviolet curing resin is applied to almost the entire surface of the disk substrate C. The resin B is diffused.

Next, as shown in step (3), ultraviolet rays D are applied to the ultraviolet curable resin B by a mercury lamp or the like, and the ultraviolet curable resin B is cured.

Next, as shown in step (4), the disk substrate C to which the ultraviolet curable resin B on which the guide groove E for tracking is formed is attached is needled from the stamper A to manufacture the magneto-optical disk substrate F.

Finally, as shown in step (5), a magnetic film G is adhered to the surface of the magneto-optical disk substrate F on which the guide groove E for tracking is formed by an appropriate means, thereby completing the magneto-optical disk H.

The magneto-optical disk H has a small storage capacity because it cannot perform one-sided read / write with the magnetic coating G attached.

Therefore, a method of manufacturing a magneto-optical disk as shown in FIG. 4 has been conventionally performed.

That is, first, as shown in step (1), an epoxy resin adhesive I is applied to the portion of the magneto-optical disk H to which the magnetic film G is attached.

Next, as shown in step (2), the magneto-optical disk H is coated with the epoxy resin adhesive I, and the other magneto-optical disk H is moved to the portion where the magnetic film G is adhered. Are placed facing each other.

Next, as shown in step (3), the magneto-optical disks H are pressed and cleaned.

Next, as shown in step (4), a tracking guide groove E (third track) between the magneto-optical disks H bonded to each other is formed.
(See the figure).

Next, as shown in the step (5), a high-viscosity ultraviolet curable resin J is applied to approximately 16 equally-spaced outer peripheral end surfaces of the joined portions of the magneto-optical disks H joined to each other.

Next, as shown in step (6), the ultraviolet curable resin J is irradiated with ultraviolet light K.

Then, as shown in step (7), the ultraviolet curable resin J is cured, the magneto-optical disks H are completely adhered to each other, and the magnetic films G are adhered to both surfaces, so that both surfaces can be read / written. The magneto-optical disk L is completed.
FIG. 5 is a plan view of the magneto-optical disk L.

[Problems to be solved by the invention]

However, the conventional method of manufacturing a magneto-optical disk involves applying a highly viscous ultraviolet-reinforced resin J to approximately 16 equally-spaced outer peripheral end surfaces of a bonded portion of a magneto-optical disk H bonded to each other. Since the resin must be cured by applying an ultraviolet ray K to the resin cured J and bonded, it takes a lot of work time and the adhesiveness is not very good.

In addition, since the high-viscosity ultraviolet curable resin J is applied to 16 points of the outer peripheral end surface of the magneto-optical disk which are almost equally divided, the external appearance of the outer peripheral end surface of the magneto-optical disk is deteriorated, and the applied ultraviolet curable resin is hardened. There were problems such as the mechanical characteristics, that is, the surface runout acceleration being deteriorated due to the unbalance of the resin J.

The present invention is directed to a method of manufacturing an optical disc which has been made in order to solve the problems in such a conventional method of manufacturing a magneto-optical disc, wherein an inner peripheral portion of at least one of the optical discs having no optical recording surface is bonded. Irregularities are provided on the surface and / or outer peripheral surface, a non-ultraviolet curable resin-based adhesive is applied to the optical recording surface, and an ultraviolet-curable resin-based adhesive is applied to the irregular surface; The other optical disk is brought into contact with the optical recording surfaces facing each other, and the ultraviolet-curing resin-based adhesive applied to the uneven surface is irradiated with ultraviolet rays and bonded to each other, thereby shortening the manufacturing operation time, An object of the present invention is to manufacture an optical disk in which the inner and outer peripheral surfaces of both optical disks are securely bonded together, and the outer peripheral end surface of the optical disk is improved in appearance and acceleration of surface deflection is improved. One in which the.

[Means for solving the problem]

An optical disk manufacturing method according to the present invention is directed to a method for manufacturing an optical disk in which optical recording surfaces of a pair of optical disks having an optical recording surface on one surface of a transparent disk substrate are bonded to each other in a state of facing each other. A recording surface and an irregularity on an inner peripheral surface and / or an outer peripheral surface of the optical disk located outside the optical recording surface are provided on at least one of the optical disks, and a non-ultraviolet curable resin-based adhesive is provided on the optical recording surface. And a step of interposing an ultraviolet-curable resin-based adhesive on the surface of the irregularities, and pressing the one optical disc and the other optical disc so that the optical recording faces face each other, and then pressurizing the non-ultraviolet light. A curable resin-based adhesive is spread over the inner and outer peripheral portions of the optical recording surface, and the UV-curable resin-based adhesive is spread over the uneven surface. And curing the UV curable resin-based adhesive by applying ultraviolet rays to the UV curable resin-based adhesive, and then heat-curing or naturally curing the non-UV-curable resin-based adhesive. And a step of producing the optical disk.

[Action]

According to the optical disc manufacturing method of the present invention, at least one of the optical discs to be stuck together has irregularities on the inner peripheral surface and / or the outer peripheral surface outside the optical recording surface, and the ultraviolet curable resin-based Is applied, and the other optical disc is brought into contact with the other optical disc such that the optical recording surfaces thereof face each other, and the ultraviolet curable resin-based adhesive applied to the uneven surface is irradiated with ultraviolet rays and adhered to each other. By matching, the manufacturing work time is shortened, the inner peripheral surface and the outer peripheral surface outside the optical recording surfaces of both optical disks are securely bonded, and the outer peripheral end surface of the optical disk is improved in appearance, and the runout acceleration is reduced. An improved optical disk can be manufactured.

〔Example〕

Hereinafter, a method for manufacturing an optical disk according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a view showing a manufacturing process of a method for manufacturing an optical disk according to the present invention. Hereinafter, a method for manufacturing an optical disk will be described according to this manufacturing process. In the embodiment of the method for manufacturing an optical disk described below, a method for manufacturing a magneto-optical disk will be described.

First, a magneto-optical disk 1 as shown in step (1) is prepared. The magneto-optical disk 1 is manufactured by the same method as the conventional one shown in FIG. 3, except that the inner peripheral surface 1c and the outer peripheral surface 1c outside the magneto-optical recording surface of the magneto-optical disk 1 are different. The point that unevenness 1e at substantially equal intervals is formed in 1d is different from the conventional one.

Next, as shown in step (2), a non-ultraviolet curable resin-based adhesive, that is, an epoxy resin-based adhesive 2 is applied to the magneto-optical recording surface 1b of the magneto-optical disk 1 to which the magnetic film is attached.
And an ultraviolet curable resin-based adhesive 3 is applied to the inner and outer peripheral surfaces 1c and 1e of the magneto-optical disk 1 having no magneto-optical recording surface. Next, as shown in step (3), irregularities 1e at substantially equal intervals are formed on the inner and outer peripheral surfaces 1c and 1d having no magneto-optical recording surface on the other magneto-optical disk 1. The formed magneto-optical disc 1 is placed with its magneto-optical recording surface 1b facing the inside (note that the magneto-optical recording surface of the other magneto-optical disc 1 which is joined to one magneto-optical disc 1 and has no magneto-optical recording face) The unevenness 1e as described above may not be formed on the peripheral surface 1c and the outer peripheral surface 1d.)

Next, as shown in step (4), the magneto-optical disks 1, 1
Press and clean each other.

Next, as shown in step (5), an ultraviolet-curable resin adhesive 3 applied to the unevenness 1e formed on the inner peripheral surface 1c and the outer peripheral surface 1d of the magneto-optical disk 1 having no magneto-optical recording surface. , 3 are cured by irradiating ultraviolet rays 4, 4 to bond the inner peripheral surface 1c and the outer peripheral surface 1d together, and appropriately heat the entire magneto-optical disk 1, or cure the epoxy resin system by natural curing. When the adhesive 2 is cured, the magneto-optical recording surfaces 1b of the magneto-optical disk 1 are completely bonded to each other, and both surfaces have magneto-optical recording surfaces 1b, 1b, and both surfaces can be read / written. The magnetic disk 5 is completed. FIG. 2 is a plan view of the magneto-optical disk 5.

As described above, the UV-curable resin-based adhesive applied to the uneven surfaces 1e provided on the outer peripheral surfaces 1d, 1d of the inner peripheral surfaces 1c, 1c having no magneto-optical recording surfaces of the magneto-optical disks 1, 1 By applying ultraviolet rays 4,4 to 3,3 to cure and adhere, the adhesion is more securely and reliably performed, and the unevenness 1e
Is formed, the thickness of the magneto-optical disk 5 that can be read / written on both sides becomes constant.

〔The invention's effect〕

An optical disk manufacturing method according to the present invention is directed to a method for manufacturing an optical disk, wherein the optical recording surfaces of a pair of optical disks having an optical recording surface on one surface of a transparent disk substrate are bonded to each other so as to face each other. A recording surface and at least one of an optical disk having an inner peripheral surface and / or an outer peripheral surface of the optical disk positioned on the optical recording surface are provided with irregularities, and a non-ultraviolet curable resin-based adhesive is provided on the optical recording surface. And a step of interposing an ultraviolet-curable resin-based adhesive on the surface of the irregularities, and pressing the one optical disc and the other optical disc so that the optical recording faces face each other, and then pressurizing the non-ultraviolet light. A cured resin adhesive is spread over the inner and outer peripheral portions of the optical recording surface, and
A step of spreading the UV-curable resin adhesive over the surface of the irregularities, and then performing cleaning, and curing the UV-curable resin adhesive by applying ultraviolet light to the UV-curable resin adhesive. And a step of heat-curing or naturally curing the non-UV-curable resin-based adhesive. The inner peripheral surface and / or outer peripheral surface having no recording surface is more firmly and reliably bonded, and the thickness of an optical disk on which reading / writing can be performed on both surfaces becomes constant, and It is possible to manufacture an optical disk in which the appearance of the outer peripheral end surface of the optical disk is improved and the surface deflection acceleration is improved.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of a method of manufacturing an optical disk according to the present invention, FIG. 2 is a plan view of an optical disk manufactured by this method, FIG. 3 is a view showing a conventional method of manufacturing a magneto-optical disk, FIG. 4 is a diagram showing a method of manufacturing another conventional magneto-optical disk, and FIG. 5 is a plan view of the conventional magneto-optical disk. 1 optical disk (magneto-optical disk) 1a transparent disk substrate 1b optical recording surface (magneto-optical recording surface) 1c inner peripheral surface 1d outer peripheral surface 1e unevenness 2 epoxy resin Adhesive 3 UV-curable resin adhesive 4 UV 5 magneto-optical disk

Claims (1)

(57) [Claims] 1. A method for manufacturing an optical disk, wherein an optical recording surface of a pair of optical disks having an optical recording surface on one surface of a transparent disk substrate is bonded to each other in a state of facing each other. At least one of the optical disks is provided with irregularities on the inner peripheral surface and / or outer peripheral surface of the optical disk located outside the optical recording surface, and a non-ultraviolet curable resin-based adhesive and the irregularities are provided on the optical recording surface. Interposing an ultraviolet curable resin-based adhesive on the surface of the first optical disc and pressing the first optical disc and the other optical disc such that the optical recording faces face each other, and then pressurizing the non-ultraviolet curable resin based adhesive. Spreading the adhesive over the inner and outer peripheral portions of the optical recording surface, and spreading the ultraviolet-curable resin-based adhesive over the uneven surface, and then performing cleaning. Applying ultraviolet light to the ultraviolet-curable resin-based adhesive to cure and fix the ultraviolet-curable resin-based adhesive, and then heat-curing or naturally curing the non-ultraviolet-curable resin-based adhesive. A method for manufacturing an optical disk, comprising: