JP2820590B2 - Method and apparatus for manufacturing optical memory element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing an optical memory device such as a magneto-optical disk and a magneto-optical card capable of optically reading and writing information.

[0002]

2. Description of the Related Art As an optical memory element capable of optically reading and writing information, a magneto-optical system utilizing the Kerr effect has been proposed. When manufacturing an optical memory element of this type, an optical recording layer is formed after forming a pregroove or a prepit as an optical tracking guide on a substrate.

In Japanese Patent Application Laid-Open No. Hei 2-189939, in order to simplify the manufacturing process of an optical memory device, as shown in FIG. The grooves 54 are formed by dropping an ultraviolet curable resin 52 in which a material is dispersed (FIG. 9B) and irradiating ultraviolet rays while pressing with a stamper 53 (FIG. 10C).

An ultraviolet curable resin 52 in which a magnetic or photoresponsive material is dispersed functions as a recording medium. Therefore, according to this method, the step of forming a pre-groove or a pre-pit and the step of forming a recording medium layer can be completed in one molding step.

[0005]

However, in the above-described conventional configuration, since the ultraviolet curable resin 52 in which a magnetic or photoresponsive material is dispersed is used for the recording medium, desired magnetic properties or magnetic properties can be obtained. There is a problem that it is difficult to obtain optical characteristics.

Particularly, in a configuration in which the ultraviolet curable resin 52 is sandwiched and pressed between the flat substrate 51 and the flat stamper 53, it is extremely difficult to obtain a recording medium having a large perpendicular magnetic anisotropy.

[0007]

According to a first aspect of the present invention, there is provided a method of manufacturing an optical memory device, comprising the steps of: applying a resin in which magnetic particles are dispersed to a film base; While bending the resin-coated film base on the cylindrical surface of the pressure roller, pressing it with a concave stamper to form a pre-groove on the applied resin, and curing the resin to flatten the film base And a step of compressing the magnetic particles dispersed in the resin in a direction along the film base.

According to a second aspect of the present invention, there is provided a method of manufacturing an optical memory device, comprising the steps of: applying a resin in which magnetic particles are dispersed to a concave stamper; Pressing with a concave stamper while bending on the cylindrical surface of the roller, bonding the resin that formed the pre-groove to the film base, curing the resin, returning the film base to flatness and dispersing it in the resin And compressing the magnetic particles in the direction along the film base.

According to a third aspect of the present invention, there is provided an optical memory device manufacturing apparatus, comprising: an application section for applying a resin in which magnetic particles are dispersed to a film base;
From a cylindrical pressing roller that bends the resin-coated film base, a concave stamper that presses the resin on the bent film base with the cylindrical surface of the pressing roller, and forms a pre-groove, and a curing unit that cures the resin That is, the film base is returned to a flat state by curing the resin, and the magnetic particles dispersed in the resin are compressed in a direction along the film base.

According to a fourth aspect of the present invention, there is provided an optical memory device manufacturing apparatus, wherein a concave stamper for forming a pre-groove and a resin in which magnetic particles are dispersed are applied to the stamper. It consists of an application section, a cylindrical pressure roller that bends the film base, and a curing device that cures the resin.The pregroove is formed by pressing the concave base stamper while bending the film base with the cylindrical surface of the pressure roller. The resin is adhered to the film base, and the resin is cured, thereby returning the film base to a flat surface and compressing the magnetic particles dispersed in the resin in a direction along the film base.

[0011]

According to the first aspect of the present invention, the resin-coated film base follows the cylindrical surface of the cylindrical pressing roller, so that the resin is stretched in the direction along the film base by receiving a tensile stress. The base contracts in a direction along the film base under compressive stress. In this state,
By pressing with a concave stamper, a pre-groove is formed in the resin and the resin is cured. Resin shrinks with curing. In addition, a restoring force for returning the film base to a flat state acts to compress the resin. For this reason, the magnetic particles dispersed in the resin are compressed in a direction along the film base. Thereby, a recording medium layer having a large perpendicular magnetic anisotropy can be obtained. Therefore, the pregroove is directly formed on the recording medium layer, and
An optical memory element in which a recording medium layer has a large perpendicular magnetic anisotropy can be manufactured efficiently.

According to the second aspect of the present invention, the resin is the same as the first aspect except that the resin in which the magnetic particles are dispersed is applied to the stamper and the resin is adhered to the film base when the pregroove is formed. Therefore, there is an operation similar to that of the first aspect.

According to the third aspect of the present invention, it is possible to realize an optical memory device manufacturing apparatus for performing the manufacturing method of the first aspect with a simple configuration.

According to the structure of the fourth aspect, an apparatus for manufacturing an optical memory device for implementing the method of the second aspect can be realized with a simple structure.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

The magneto-optical disk manufactured in this embodiment is
As shown in FIG. 2, it is composed of a film base 1 and a recording medium layer 2 formed on the film base 1.
The recording medium layer 2 has a structure in which magnetic particles are dispersed in a resin, and includes a pre-groove 2a and a pre-pit 2b.
Are formed directly on the recording medium layer 2.

The film base 1 is made of plastic such as polyethylene, polyethylene terephthalate, polyethylene naphthalate, polypropylene, polyimide, polycarbonate, metal such as aluminum, or synthetic paper, but is not limited thereto. Rather, any material can be used as long as it has flexibility and is in the form of a film.

As a resin serving as a base of the recording medium layer 2, a photo-setting resin or a thermosetting resin is used.

As the photocurable resin, a urethane acrylate resin, an epoxy acrylate resin, or a resin obtained by mixing them (for example, MP-107 manufactured by Mitsubishi Rayon Co., Ltd., Die Cure Clear manufactured by Dainippon Ink and Chemicals, Inc.) STM-401) is used.

As the thermosetting resin, a polyester resin, an epoxy resin, an acrylic resin, a urethane resin, a melamine resin, or a resin obtained by mixing these resins is used.

The magnetic particles may be made of yttrium iron garnet, bismuth substituted yttrium iron garnet, manganese substituted yttrium iron garnet, chromium substituted yttrium iron garnet, cesium substituted yttrium iron garnet, calcium substituted yttrium iron garnet, lead substituted yttrium iron garnet. For example, germanium-substituted yttrium iron garnet is used.

The particle size of the magnetic particles is suitably from 10 to 100 nm.

The thickness of the recording medium layer 2 is suitably from 2 to 40 μm, but is not limited to this.

The apparatus for manufacturing a magneto-optical disk according to the present embodiment
As shown in FIG. 1, after forming an intermediate 1a having a configuration in which a recording medium layer 2 is formed on a tape-like film base 1 which is of an in-line type, the above-mentioned light- Magnetic disks can be manufactured continuously.

The apparatus for manufacturing a magneto-optical disk is composed of a roll 3 on which a tape-shaped film base 1 is wound, and a film base 1 delivered from the roll 3, in which magnetic particles are dispersed in a photo-curable resin. A pre-groove 2a... And a pre-pit 2b... Formed in the applied mixture layer 4 and then cured to form the recording medium layer 2; A bonding section 8 for bonding a tape-like protective sheet 7 to the recording medium layer 2 of the tape-like intermediate 1a obtained in 6; a punching section (not shown) for punching the intermediate 1a into a disk shape; It comprises a roller 9 for winding up the remaining part after punching.

In order to improve the adhesion between the film base 1 and the recording medium layer 2, the film base 1 is previously subjected to a corona discharge treatment.

The mixture 4a is obtained by sufficiently dispersing the magnetic particles in a photocurable resin or a thermosetting resin using a mixer such as a ball mill.

As shown in FIG. 2, the forming section 6 includes a stamper 10 for forming pre-grooves 2a and pre-pits 2b and a pressing roller for pressing the mixture layer 4 on the film base 1 against the stamper 10. 11.

The surface of the stamper 10 for forming the pre-grooves 2a and the pre-pits 2b is concave, and the pressing roller 11 has a cylindrical shape. The radius of curvature of the pressing roller 11 is set to 0.2 to 10 m according to the shrinkage amount of the mixture layer 4 during curing so that the magneto-optical disk becomes flat after the resin is cured.

The pressing roller 11 is adapted to rotate, and the stamper 10 is rotated in the direction of the arrow A in the figure at the same peripheral speed as the peripheral speed of the pressing roller 11. When the formation of the pregrooves 2a and the prepits 2b of one magneto-optical disk is completed, the stamper 10 moves in the direction of arrow B in the figure and separates from the pressure roller 6,
It turns in the direction opposite to the direction of arrow A and returns to the original position.
Then, by moving in the direction opposite to the direction of arrow B, pre-grooves 2a and pre-pits 2b of the next magneto-optical disk are formed.

When a photocurable resin is used for the recording medium layer 2, an ultraviolet irradiation device 12 (curing means) is arranged inside the pressing roller 11 so that the molded mixture layer 4 can be irradiated with ultraviolet light. .

When a thermosetting resin is used for the recording medium layer 2, as shown in FIG. 3 and FIG.
A heater 13 (curing means) is arranged on the convex surface opposite to the surface for forming the pre-grooves 2a and the pre-pits 2b so that the molded mixture layer 4 can be heated.

The bonding section 8 overlaps the roll 14 around which the tape-shaped protective sheet 7 is wound, the protective sheet 7 sent from the roll 14 and the tape-shaped intermediate 1a, and attaches the protective sheet 7 to the recording medium layer 2 And a roller 15 to be attached to the sheet.

In the configuration of the above-described apparatus for manufacturing a magneto-optical disk, the film base 1 subjected to the corona discharge treatment is sent out from the roll 3 at a constant speed. In the application section 5, the mixture 4a is applied to the film base 1, and the mixture layer 4 is formed. The thickness of the mixture layer 4 is, for example, 70 μm.

In the molding section 6, pregrooves 2a and prepits 2b are formed in the mixture layer 4. That is, the pre-grooves 2a and the pre-pits 2b are formed by pressing the mixture layer 4 against the stamper 10 by the pressing roller 11. Since the film base 1 and the mixture layer 4 follow the cylindrical surface of the pressing roller 11, the mixture layer 4 receives tensile stress and expands in the layer direction, and the film base 1 receives compressive stress and contracts. In this state, ultraviolet irradiation or heating is performed. The mixture layer 4 hardens and shrinks accordingly. Further, the restoring force of the film base 1 to return to the flat state acts to compress the mixture layer 4.

As a result, the magnetic particles in the mixture layer 4 are also compressed, so that the recording medium layer 2 having a large perpendicular magnetic anisotropy is formed.

The intermediate 1a thus obtained is conveyed to the bonding section 8, where the tape-shaped protective sheet 7 is bonded to the recording medium layer 2, and then punched into a disk shape. Thus, a magneto-optical disk is obtained. The remaining part of the intermediate 1 a is wound up by the roller 9.

As described above, according to the method and apparatus for manufacturing a magneto-optical disk of the present embodiment, the pre-groove 2a
And the prepits 2b are formed directly on the recording medium layer 2, and a magneto-optical disk in which the recording medium layer 2 has a large perpendicular magnetic anisotropy can be manufactured efficiently.

In the above embodiment, the mixture 4a is applied to the film base 1. However, the mixture 4a may be applied to the stamper 10 and adhered to the film base 1 during molding.

In the above embodiment, the manufacturing method and the manufacturing apparatus have been described by taking the magneto-optical disk as an example.
The present invention can be widely applied to optical memory devices such as magneto-optical cards and magneto-optical tapes.

When manufacturing an optical memory tape,
The bonding step of the protective sheet 7 and the punching step can be omitted.

The method for manufacturing a magneto-optical disk according to the first aspect of the present invention is directed to a method for manufacturing a magneto-optical disk comprising:
a) on the film base 1, and pressing the film base 1 coated with the mixture 4 a on the concave surface of the stamper 10 while bending the film base 1 on the cylindrical surface of the pressing roller 11.
Forming the pre-grooves 2a on the applied mixture 4a, and curing the mixture 4a, thereby returning the film base 1 to a flat surface and dispersing the magnetic particles dispersed in the mixture 4a along the film base 1. In the direction of compression.

With the above configuration, the film base 1 on which the mixture 4a is applied follows the cylindrical surface of the cylindrical pressing roller 11, so that the mixture 4a receives tensile stress and extends in the direction along the film base 1. Then, the film base 1 receives a compressive stress and contracts in a direction along the film base 1. In this state, the pre-grooves 2a are formed in the mixture 4a by pressing with the concave stamper 10, and the mixture 4a is cured. The mixture 4a shrinks with curing. In addition, the restoring force for returning the film base 1 to the flat state acts to compress the mixture 4a.
Therefore, the magnetic particles dispersed in the mixture 4 a are compressed in a direction along the film base 1. Thereby, the recording medium layer 2 having a large perpendicular magnetic anisotropy is obtained.
Therefore, a magneto-optical disk in which the pregrooves 2a are formed directly on the recording medium layer 2 and the recording medium layer 2 has a large perpendicular magnetic anisotropy can be efficiently manufactured.

According to a second aspect of the present invention, there is provided a method for manufacturing a magneto-optical disk, comprising the steps of:
a) on the concave stamper 10 and pressing the concave base stamper 10 while bending the film base 1 on the cylindrical surface of the pressing roller 11 to form the mixture 4a having the pregrooves 2a. 1 and a step of curing the mixture 4a to return the film base 1 to a flat surface and compressing the magnetic particles dispersed in the mixture 4a in a direction along the film base 1. is there.

According to the above construction, the mixture 4a in which the magnetic particles are dispersed is applied to the stamper 10, and the mixture 4a is adhered to the film base 1 when the pregrooves 2a are formed. Since it is the same as the first aspect, the same operational effect as the first aspect is obtained.

According to a third aspect of the present invention, there is provided an apparatus for manufacturing a magneto-optical disk, comprising: a mixture of magnetic particles dispersed in a resin;
a, a coating unit for applying a to the film base 1;
A pressing roller 11 having a cylindrical shape for bending the film base 1 coated with the resin and a mixture 4 a on the film base 1 bent by the cylindrical surface of the pressing roller 11 are pressed to form a pregroove 2.
a. A concave stamper 10 forming a.
The film base 1 is cured by curing the mixture 4a, thereby returning the film base 1 to a flat surface and compressing the magnetic particles dispersed in the mixture 4a in a direction along the film base 1. .

According to the above configuration, a magneto-optical disk manufacturing apparatus that performs the manufacturing method of claim 1 can be realized with a simple configuration.

In the apparatus for manufacturing a magneto-optical disk according to the fourth aspect of the present invention, a stamper 10 having a concave shape for forming pregrooves 2a and a mixture 4a in which magnetic particles are dispersed in a resin are applied to the stamper 10. And a hardening unit for hardening the mixture 4a. The bending unit presses the film base 1 with the concave stamper 10 while bending the film base 1 with the cylindrical surface of the pressing roller 11. The mixture 4a on which the pregrooves 2a are formed is adhered to the film base 1 and the mixture 4a is cured, thereby returning the film base 1 to a flat surface and dispersing the magnetic particles dispersed in the mixture 4a into a film. This is a configuration in which compression is performed in a direction along the base 1.

According to the above configuration, a magneto-optical disk manufacturing apparatus that performs the manufacturing method of claim 2 can be realized with a simple configuration.

[0050]

According to the first aspect of the present invention, there is provided a method of manufacturing an optical memory device, comprising: applying a resin in which magnetic particles are dispersed to a film base; While bending on the cylindrical surface of the roller,
Pressing with a concave stamper to form a pre-groove in the applied resin, and curing the resin to return the film base to a flat surface and disperse the magnetic particles dispersed in the resin along the film base. This is a configuration comprising a step of compressing in the direction.

According to the above configuration, the resin-coated film base follows the cylindrical surface of the cylindrical pressure roller, so that the resin is stretched in the direction along the film base by receiving a tensile stress, and the film base is compressed by the compressive stress. In response, it contracts in the direction along the film base. In this state, a pre-groove is formed in the resin by pressing with a concave stamper, and the resin is cured. Resin shrinks with curing. In addition, a restoring force for returning the film base to a flat state acts to compress the resin. For this reason,
The magnetic particles dispersed in the resin are compressed in a direction along the film base. Thereby, a recording medium layer having a large perpendicular magnetic anisotropy can be obtained. Therefore, there is an effect that an optical memory element in which the pregroove is directly formed in the recording medium layer and the recording medium layer has a large perpendicular magnetic anisotropy can be efficiently manufactured.

According to a second aspect of the present invention, there is provided a method of manufacturing an optical memory device, comprising the steps of: applying a resin in which magnetic particles are dispersed to a concave stamper; Pressing with a concave stamper to bond the resin with the pregroove to the film base, and curing the resin to return the film base to a flat surface and disperse the magnetic particles in the resin In the direction along the film base.

According to the above configuration, the resin is the same as the first embodiment except that the resin in which the magnetic particles are dispersed is applied to the stamper and the resin is adhered to the film base at the time of forming the pregroove. An effect similar to the effect of the first aspect is obtained.

According to a third aspect of the present invention, there is provided an optical memory device manufacturing apparatus, comprising: an application section for applying a resin in which magnetic particles are dispersed to a film base; and a cylinder for bending the resin base on which the resin is applied. Pressing roller of the shape, pressing the resin on the film base bent by the cylindrical surface of the pressing roller, a concave stamper forming a pre-groove, and a curing means for curing the resin, by curing the resin, In this configuration, the film base is returned flat, and the magnetic particles dispersed in the resin are compressed in a direction along the film base.

According to the above configuration, there is an effect that an apparatus for manufacturing an optical memory device for implementing the manufacturing method of claim 1 can be realized with a simple configuration.

According to a fourth aspect of the present invention, there is provided an optical memory device manufacturing apparatus comprising: a concave stamper for forming a pre-groove; and an application unit for applying a resin in which magnetic particles are dispersed to the stamper. A cylindrical pressing roller that bends the film base, and a curing unit that hardens the resin.The bending of the film base on the cylindrical surface of the pressing roller is performed by pressing the concave stamper to form the pregroove-formed resin into the film. By bonding to the base and curing the resin, the film base is returned flat,
In this configuration, magnetic particles dispersed in a resin are compressed in a direction along a film base.

According to the above configuration, there is an effect that an apparatus for manufacturing an optical memory device for implementing the manufacturing method of claim 2 can be realized with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an apparatus for manufacturing a magneto-optical disk according to the present invention, and is a schematic configuration diagram of an apparatus for manufacturing a magneto-optical disk using a photocurable resin.

FIG. 2 is a partially enlarged view of a molding section of FIG. 1;

FIG. 3 is a schematic configuration diagram of a magneto-optical disk manufacturing apparatus according to the present invention, and is a schematic configuration diagram of a magneto-optical disk manufacturing apparatus using a thermosetting resin.

FIG. 4 is a partially enlarged view of a molding section of FIG. 3;

FIG. 5 is an explanatory view showing a conventional method of manufacturing a magneto-optical disk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Film base 2 Recording medium layer 2a Pregroove 2b Prepit 5 Coating part 6 Molding part 10 Stamper 11 Press-contact roller 12 Ultraviolet irradiation device (curing means) 13 Heater device (curing means)

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-96521 (JP, A) JP-A-61-9243 (JP, A) JP-A-61-74151 (JP, A) (58) Field (Int.Cl. ⁶ , DB name) G11B 11/10 541 G11B 11/10 536

Claims (4)

(57) [Claims] 1. A step of applying a resin in which magnetic particles are dispersed to a film base, and applying the resin by applying a concave stamper while bending the resin-coated film base on a cylindrical surface of a pressing roller. Forming a pre-groove in the resin, curing the resin to return the film base to a flat surface, and compressing magnetic particles dispersed in the resin in a direction along the film base. A method for manufacturing an optical memory device. 2. A step of applying a resin in which magnetic particles are dispersed to a concave stamper, and bending the film base with a cylindrical surface of a pressing roller.
Pressing the concave-shaped stamper to bond the pre-groove-formed resin to the film base; and curing the resin to return the film base to a flat surface and to disperse the magnetic particles dispersed in the resin into the film base. A method of manufacturing an optical memory device, comprising a step of compressing in an along direction. 3. A coating section for applying a resin in which magnetic particles are dispersed to a film base, a cylindrical pressing roller for bending the resin-coated film base, and a pressing roller on the film base bent by the cylindrical surface of the pressing roller. Consists of a concave stamper that presses the resin and forms a pre-groove, and a curing unit that cures the resin. By curing the resin, the film base is returned to a flat surface, and the magnetic particles dispersed in the resin are dispersed in the film base. An apparatus for manufacturing an optical memory device, comprising: 4. A stamper having a concave surface for forming a pregroove, an application section for applying a resin in which magnetic particles are dispersed to the stamper, a cylindrical pressure roller for bending a film base, and a curing means for curing the resin. While bending the film base on the cylindrical surface of the pressure roller,
By pressing with a concave stamper, the resin that formed the pre-groove was adhered to the film base, and the resin was cured, thereby returning the film base to a flat surface and dispersing the magnetic particles dispersed in the resin along the film base. An optical memory device manufacturing apparatus characterized in that the optical memory element is compressed in a direction.