JPS61196442A - Film forming method for recording medium - Google Patents

Abstract

PURPOSE:To enable film forming of a large area and continuous recording layer by coating a protective layer made of resin while running a film substrate, and sticking and laminating the recording layer by scattering raw materials of the recording layer. CONSTITUTION:A protective layer is coated by running a film on a transferring roller 5 on the way of carrying the film 6 from a winding-out roll 1 to a can 3. The film 6 on which the protective layer is coated is carried on the can 3 while keeping the formed protective layer not to come into contact with equipment such as a carrying roll, etc. At this time, materials 9 of a photomagnetic recording layer filled in an evaporation source tank 8 are filmed on the protective layer by vapor deposition, sputtering etc., and a recording layer is laminated. The direction of incidence of the material 9 on the protective layer of the film 6 is controlled by shielding plates 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing an inexpensive magneto-optical recording medium using a plastic film as a substrate.

[Conventional technology]

Research into optical memory, which optically reads out information recorded on various recording media, has been actively conducted for a long time, but such optical memory has been developed with high density and large size, especially in recent years with the development of laser light sources and optical elements. It is attracting attention as a high-capacity memory. As a type of such recording media, a magneto-optical recording medium is known in which magnetically stored information is read out using the magneto-optic effect.

[Problem that the invention seeks to solve]

However, the magneto-optical effect is significantly affected by non-uniform optical properties of the materials that make up the recording medium and scattering of light due to defects such as scratches, which tends to hinder the desired effect. Translucent substrates used for media include:
Glass substrates that have uniform optical properties and are less susceptible to scratches, or hard plastic substrates that are molded under precise control to reduce birefringence are used. For this reason, the material cost of the substrate increases, and although the recording layer deposition process can be performed continuously over a large area, it is difficult to cut the substrate into the desired shape after the recording layer is deposited. Therefore, it has been difficult to put it into practical use using a large-area substrate. Furthermore, in the film forming apparatus, there is a restriction in the size of the substrate accommodating portions before and after the recording layer f& film, and therefore, there is also a restriction in continuous film formation.

As a result, it is necessary to form a film on each substrate having a diameter of about 30 cm at most, and there is a problem in that it is impossible to reduce manufacturing costs through mass production.

In view of the above problems, the present invention has been developed by using a plastic film as a substrate of a recording medium, which is easy to cut and accommodate, and thus enables a continuous recording layer formation process, thereby making it possible to mass-produce recording media. Focusing on the fact that it is possible to achieve
This was accomplished by finding a means to solve the following problems that arise when a film is used as a substrate.

In other words, the present invention was accomplished by finding a means for removing minute scratches, which originally exist in larger quantities in film than in hard plastics or glass, and which cause noise and errors in recording media.

SUMMARY OF THE INVENTION An object of the present invention is to provide a recording medium film forming method that enables continuous production of magneto-optical recording media and realizes mass production thereof.

Another object of the present invention is to provide a recording medium film forming method that can produce a tape-shaped magneto-optical recording medium.

[Means for solving problems]

In the film forming method of a recording medium of the present invention, in forming a film of a recording medium having a recording layer on a film substrate, while running the film substrate from a film substrate feeding means to a film substrate winding means, (a) coating and laminating a protective layer made of resin directly on the film substrate; (b) a step of coating and laminating a protective layer made of resin directly on the film substrate; The recording layer is deposited and laminated on the contact layer by scattering the raw material of the recording layer toward the contact layer.

〔Example〕

FIG. 1 is a schematic diagram showing the structure of an embodiment of an apparatus used to carry out the method of forming a film for a magneto-optical recording medium according to the present invention. This device includes a roll-shaped can 3 that slides the film 6 while applying tension to the film 6 between an unwinding roll 1 that is a film feeding unit and a take-up roll 2 that is a film winding unit. The film 6 can be run at a desired speed by rotating the unwinding roll 1, take-up roll 2, and can 3 and controlling their rotational speeds. In addition, a shielding plate 7 is provided below the can 3.
A water source tank 8 is disposed through the tank.

Further, a resin coating means having the transfer roller 5 as a necessary part is provided at a position where the film 6 is traveling from the unwinding roll 1 to the can 3.

Hereinafter, the present invention will be described in detail using the above-mentioned apparatus as an example.

When the film 6 is fed out from the unwinding roll 1, first, while being conveyed from the unwinding roll 1 to the can 3, the film 6 is run on the transfer roller 5, thereby being coated with a protective layer. The molten resin filled in the hopper 11 is supplied to the transfer roller 5 via the roller 4 .

Examples of the resin for forming the protective layer include thermoplastic polyester, polystyrene, polycarbonate, polymethacrylate, polyacrylate, polyvinyl butyral, polyisobutylene, polyvinyl chloride, acrylonitrile styrene, and polyethylene.

Polypropylene etc. can be used.

This protective layer is directly coated on the surface of the film 6 to eliminate pinholes, roughness, etc. in the recording layer film caused by defects such as scratches that originally exist on the surface of the film 6, and to eliminate noise during recording and playback. It is coated to significantly reduce errors.

To achieve this purpose, the thickness of the protective layer should be approximately 10μ
s or more is preferable. Adjustment of the thickness of the protective layer.

For example, this can be done by controlling the running speed of the film 6 and the rotational speed of the transfer roller 5.

The film 6 coated with the protective film is transported onto the can 3 with the formed protective layer kept out of contact with equipment such as transport rolls. At this time, the evaporation source tank 8 is placed on the protective layer.
The raw material 9 for the magneto-optical recording layer is deposited by vapor deposition, sputtering, etc., and the recording layer is laminated. This raw material 9
The direction in which the light is incident on the protective layer of the film 6 is controlled by the shielding plate 7.

As the raw material 9 for the magneto-optical recording layer, a material that can form a magnetic layer having an axis of easy magnetization perpendicular to the film surface by a film forming method such as vapor deposition or sputtering is used as the main raw material.

Furthermore, the film on which the protective layer and the recording layer have been formed is conveyed from the can 3 to the take-up roll 2.

The magneto-optical recording medium manufactured as described above may be punched into a disk shape as in the past, or may be processed into a tape shape and used as a magneto-optical recording tape.

On the recording layer of the magneto-optical recording medium produced by the method of the present invention, a substrate with good flatness and less deformation due to rotation or movement of the substrate during recording and reproduction may be bonded via an adhesive layer. .

Furthermore, it is also possible to provide a protective layer between the adhesive layer and the recording layer, if necessary.

An example of a magneto-optical recording medium produced by the method of the present invention is shown in FIG.
-1. This deployment medium is formed by bonding a substrate 2-5 to a laminate consisting of resin protection 11j) 2-2 and a recording layer 2-3 via an adhesive layer 2-4.

In addition to the above resin calendar as a further protective layer.

For example, below the can 3 shown in FIG.
It is also possible to provide a vapor deposition source of an inorganic material such as Si3N4, AjN, SiC, etc., and to laminate a transparent dielectric layer by vapor deposition, sputtering, or the like. However, this kind of protective layer
It is different in purpose from the above-mentioned protective layer because it acts to improve the storage stability of the recording layer rather than the film that is the substrate.

Further, in addition to a single recording layer made of a magneto-optical material, an auxiliary layer made of an inorganic material, a metal material, etc. can also be laminated by a similar method in order to improve the quality of recorded and reproduced signals.

〔Effect of the invention〕

By the method of the present invention, it was possible to use a film that could not be used conventionally as a substrate for a magneto-optical recording medium.

As a result, the material cost of the medium is low, and
It has become possible to form a large-area, continuous recording layer, and the manufacturing cost has also been reduced.

Furthermore, the method of the present invention has also made it possible to manufacture a tape-shaped magneto-optical recording medium, which has not been possible in the past.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of a magneto-optical recording medium which is an example of an apparatus used in the method of the present invention. 1: unwinding roll, 2: winding roll, 3: can 4: roller, 5: transfer roller, 6: film 7: shielding plate,
8: Evaporation source tank 9: Magneto-optical recording material, 11: Hopper 2-1: Transparent film substrate, 2-2 = Protective film layer 2-3
: Recording layer, 2-4: Adhesive layer 2-5: Substrate for bonding

Claims (1)

[Claims] 1) In forming a recording medium having a recording layer on a film substrate, while running the film substrate from a film substrate feeding means to a film substrate winding means, (a) a step of coating and laminating a resin protective layer directly on the film substrate; (b) recording toward a traveling laminate with at least the protective layer laminated on the film substrate; 1. A method for forming a recording medium, comprising the step of adhering and laminating a recording layer on the laminate by scattering a raw material for the layer. 2) Forming a recording medium according to claim 1, in which a light-transmitting film is used as the film substrate, and a material for forming a magnetic film having an axis of easy magnetization perpendicular to the film surface is used as a raw material for the recording layer. Method.