JPS62140258A - Manufacture of optical recording carrier and its producing device - Google Patents

Abstract

PURPOSE:To use a highly duhumidifying high temperature curing type adhesive and to realize a highly reliable recording medium by sticking two substrates by a high temperature curing type adhesive through a metallic spacer and applying an AC magnetic field to them. CONSTITUTION:Two glass plates 21 with recording layers 24 are stuck by the high temperature curing type epoxy adhesive 22 through Al metallic spaces 23a and 23b. When the plates 21 in that state are placed on a supporting stand 12 to apply an AC magnetic field by an AC power source 14, only the Al spacers 23a and 23b are heated to cure the epoxy adhesive 22. However the recording layers 24 do not contact the spacers, and therefore they are not damaged. Thus the highly duhumidifying high temperature curing type epoxy polyamide, etc., can be used to realize the highly reliable recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method and apparatus for manufacturing an optical record carrier for recording/reproducing information using light such as a laser beam.

Conventional technology In recent years, optical record carriers have been widely studied as memory media with high density, large capacity, and high-speed access, and applied products include disks for data files.

Expectations are high for disks for document files, etc.

The structure of an optical record carrier is generally known to be a sandwich structure as shown in FIG. 4, and will be explained below with reference to the drawings.

In FIG. 4, 41 is a resin substrate, 42 is a recording layer, and 43 is a resin substrate.
44a and 4ab are plastic or metal spacers fitted on the outer and inner peripheries.

A method of bonding together the optical record carriers configured as described above will be described.

First, two resin substrates each having a recording layer 42 are bonded together with an adhesive 43 via spacers 44a and 44b. The adhesive 43 is generally a photo-curing type or a low-temperature epoxy resin that is cured at 100° C. or lower, such as a photocuring type or an amine type epoxy resin in which the base resin is bisphenol A type and the curing agent is 3P.

Problems to be Solved by the Invention However, the above bonding method has the following two problems. The first point is that conventionally used room-temperature curing epoxy adhesives for bonding have poor moisture resistance and are susceptible to deterioration due to moisture infiltration, resulting in poor reliability, as shown in Table 1. That is the point.

The second point is that high temperature curing adhesives with excellent moisture resistance cannot be used. This is because if an optical record carrier is left at a high temperature of 100° C. or higher, the recording layer will be damaged and the tracking guide groove of the substrate will be deformed due to heat.

In view of the above-mentioned problems, the present invention provides a method and apparatus for manufacturing an optical record carrier that can realize a highly reliable optical record carrier using a high-temperature curing adhesive with excellent moisture resistance.

Means for Solving the Problems In order to achieve this object, in the optical record carrier manufacturing method and its manufacturing apparatus of the present invention, substrates having a recording layer are bonded together with an adhesive through a metal spacer, and an alternating current magnetic field is applied. The adhesive for bonding is applied to the metal spacer and its surroundings.

Function: According to this method, only the metal spacer is heated by the alternating current magnetic field, and the high temperature curing adhesive applied to the metal spacer and its surroundings can be cured.

Since the recording film is thin even though it is a metal film, there is no damage caused by heat generated by alternating current magnetism and no thermal deformation of the pre-group.

Therefore, a highly reliable optical recording carrier can be obtained using a high-temperature 5-page curing type epoxy or polyimide adhesive that is highly moisture-proof and is used in ICs and the like.

EXAMPLE An example of the present invention will be described below with reference to the drawings. FIG. 1 shows an optical record carrier manufacturing apparatus in one embodiment of the present invention.

In FIG. 1, 11 is a magneto-optical record carrier, 12 is a support base for supporting the magneto-optical record carrier, 13 is a coil for generating a magnetic field, and 14 is an AC power source. 2A shows the structure of the magneto-optical recording carrier, and FIG. 2B shows an enlarged view of circle C in FIG. 2A.

In Figure 2, 21 is a glass flat plate, 22 is a base resin of novola resin, and a curing agent of phenol type (hereinafter N-P
High temperature curing type epoxy adhesive using H series), 2
3a and 23b are A7 spacers, 24 is a recording layer, 25 is a resin protective film, 26 is an inorganic protective film, 27 is an alloy recording film that is an alloy of a rare element and a transition metal, 28 is a pregroup, and the recording layer 24 is It consists of an inorganic protective film 26, an alloy recording film 27, and 286 pages of pre-groups.

The operation of the apparatus shown in FIG. 1 will be explained below.

First, the magneto-optical recording carrier 11 having the structure shown in FIG.
An alternating current is passed through. A current then flows through the coil 14 and a magnetic field is applied to the record carrier. The AC magnetic field generated by the coil 13 heats only the portions A, l, <pacers 23a, 23b of the magneto-optical recording carrier 11, and the temperature becomes high. From this, the N-PH epoxy adhesive 22 that is in contact with the AI spacer is heated and cured, but the recording layer 24 is not in contact with the adhesive or the Al spacer, and the substrate is glass, so thermal conductivity is low. No heat damage. Therefore, the third
As shown in the figure, compared to the characteristics 31 of the magneto-optical record carrier manufactured by the conventional manufacturing method, the characteristics 32 of the magneto-optical record carrier 11 manufactured by the manufacturing method of the present embodiment have a bit error rate in an environment of 80° C. and 80% RH. changes over time become smaller. In this way, this embodiment can realize a highly reliable magneto-optical recording carrier.

Effects of the Invention Page 7/゛The present invention heats only the metal spacer by applying an alternating magnetic field to the information recording carrier bonded together with a high temperature curing adhesive via the metal spacer, thereby heating the recording layer. A highly reliable optical recording carrier can be obtained by using a high-temperature curing type N-PH type adhesive with high moisture resistance and the like, which can be cured without heating.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a manufacturing apparatus for an optical record carrier according to an embodiment of the present invention, FIG. 2A is a schematic cross-sectional view showing the structure of the same magneto-optical record carrier, and FIG. 2B is an enlarged cross-section of the same essential parts. 3 are characteristic diagrams showing changes over time of a magneto-optical record carrier, and FIG. 4 is a schematic cross-sectional view showing the structure of a conventional optical record carrier. 11... magneto-optical recording carrier, 12... support stand, 13... coil, 14... AC power supply, 21... glass flat plate , 22...
Epoxy adhesive, 23a, 23b...J frame, 24...Recording layer, 25...Resin protective layer, 26...Inorganic protective film, 27・・・・・・
...Alloy recording film, 28... Pregroup. Fig. 3 11--Ikkomagnetic record Shuntan body I? --Ichishujodai Figure 2 (B)

Claims (4)

[Claims] (1) A method for producing an optical recording carrier, which comprises bonding together a plurality of substrates, at least one of which has a recording layer, with an adhesive via a metal spacer, and applying an alternating magnetic field. (2) The method for manufacturing an optical record carrier according to claim 1, wherein the substrate is made of a light-transmitting material other than metal. (3) The method for manufacturing an optical record carrier according to claim 1, wherein the adhesive for bonding the substrates is of a high temperature curing type. (4) An optical record carrier manufacturing apparatus comprising a sample stage that supports a substrate, a coil and a power source for generating an alternating magnetic field on the sample stage.