JPH0620310A - Surface working method of end face part of optical recording medium - Google Patents

Abstract

PURPOSE:To maintain productivity and to improve safety, environmental protection and durability by positioning recording media of a sticking form in parallel and applying a working material at the ends, then shaking off the excess material, thereby working the ends. CONSTITUTION:Plural sheets of card-like recording media 1 are stacked on each other via spacers 2. The recording media are pressed by pressing jigs 3 and revolving shafts 4 for pressurization from the top end and the bottom end. The working material is then applied on the end faces of the card-like recording media 1 by means of rollers and the recording media are rotated around the revolving shafts 4 for pressurization to shake off the excess working material. Energy is then applied from the peripheral parts of the card-like recording media 1 by an energy generator to harden the coated ends of the card-like recording media 1. The energy to be used is electromagnetic light, electron beams, heat, etc., and the ways of imparting the energy are various with the materials and are not restricted to one form. The working material may generally be a UV curing resin or resins of electron beam /thermosetting types which are frequently used as a hard coating material among curing type polymers.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium, and more particularly to an optical recording medium for recording or reproducing information by using a light beam.

[0002]

2. Description of the Related Art In recent years, card-type recording media have been proposed and used as information media having a size of a business card, which is convenient for carrying, by methods such as magnetism, IC, and light (laser). Among them, an optical card is expected to have a particularly low price and high capacity.

Such an optical card is disclosed in, for example, Tokushusho Sho 58-50.
As disclosed in Japanese Patent No. 0437, a recording surface is provided on the surface thereof, and a recording film for light reflection is provided there. Then, predetermined information is recorded by forming irregularities such as pits on this recording film. Although various materials have been proposed as the substrate material for this optical card, most of the practical use is made of plastic.

If these plastics are used as they are, they are easily scratched, so that a hard coat is applied.
As a result, an optical card that is resistant to scratches is manufactured, but a cutting process is necessary for the optical card to finally have a shape.

Conventionally, as the cutting method, a cutting method using a punching blade has been mainly used. Further, conventionally, the cut portion is not surface-treated, and the substrate, the adhesive layer, the recording layer, the overcoat layer, and the backing material are in contact with the outside air (see FIG. 7). This is the same for a disk-shaped optical recording medium, and an air sandwich type shape has been proposed for the sake of sensitivity, but there are few proposals for a processing method for the end portion.

[0006]

A recording medium, particularly an optical recording medium, has a problem of deterioration due to high temperature and high humidity, and an optical card may start from an end portion such as gasoline, alcohol, perfume, camphor, etc. depending on its carrying condition. There is a problem of deterioration. These problems may cause peeling due to a decrease in adhesive strength, and may lead to a decrease in reflectance due to elution, transformation, deterioration of the recording material.

Some optical cards are set so that the recording layer is not exposed to the external environment as shown in FIG.
However, this method of forming the adhesive portion in a frame shape complicates the process of forming the recording layer and lowers the productivity, and also limits the recording capacity. You have to wipe off the parts.

Therefore, in order to compensate for these drawbacks, after cutting into a card shape, when the hard coating agent is applied to the substrate surface portion, the hard coating agent is also applied to the end surface portion of the recording medium,
It was devised to put on a sealant.

However, in these methods, it is complicated to process the hard coating agent and the sealing agent one by one and the productivity is poor, and one by one when irradiating light such as uv,
It is necessary to change the irradiated area and cure.

When several sheets of recording medium are aligned and coated with the processing agent at the same time, it is necessary to separate the cards when subsequently curing or polymerizing the processing agent.

Recently, it has been necessary to prevent metal such as tellurium from being exposed to the outside for the purpose of avoiding environmental problems and toxicity.

From the above, it is desired to manufacture an optical recording medium which achieves safety, environmental protection and durability improvement without impairing productivity.

[0013]

According to the present invention, edge processing capable of improving productivity and durability of a recording medium in a laminated form can be simultaneously applied to a plurality of media. Therefore, it is possible to improve the durability of a recording medium, especially an optical card under high temperature and high humidity, to protect the environment, and to secure safety.

Specifically, a recording medium in a laminated form is positioned in parallel, a processing material is applied to the ends, and then the recording medium is rotated to shake off excess material to process the ends.

The present invention will be described below with reference to the drawings. As shown in FIGS. 1, (a) and (b), a card-shaped recording medium 1
A plurality of sheets are stacked with the spacer 2 interposed therebetween. The pressing jig 3 and the pressing rotary shaft 4 are pressed from the upper and lower ends. Next in FIG.
As shown in FIG. 3, a processing material is applied to the end surface of the card-shaped recording medium 1 by, for example, a roller 5, and then, as shown in FIG. Shake it off. Next, as shown in FIGS. 5 and 6, energy is applied by the energy generator 7 from the peripheral portion of the card recording medium 1 to cure the coating end portion 6 of the card recording medium 1.

The energy described here is an electromagnetic wave,
Light, electron beams, heat, etc. are shown and applied in various ways depending on the material, and the present invention is not limited to the form shown in FIG. It may or may not be rotated.

The spin rate during coating is preferably 300 to 3000 rpm, although it depends on the viscosity of the material. The rotation in the case of energy application is to prevent the energy application from becoming uneven, and the rotation speed is 0 to 2000 rp.
m, preferably 10 to 500 rpm. The processing material described here may be a UV curable resin, an electron beam curable resin, or a thermosetting type resin which is generally used as a hard coat material among curable polymers. Further, as the rubber type, for example, one having a shock absorbing ability and water repellency such as silicone rubber can be used. When it is desired to have water repellent property and the size of the recording medium should not be strictly changed, it is preferable to treat with a fluorine compound.

In the optical recording card of the card type recording media described here, a substrate having the following conditions can be generally used.

That is, if the transmittance is high in the wavelength range of the light source used for recording and reproduction, and the mechanical strength and the optical characteristics are satisfied without causing deformation or deterioration in the subsequent process, it is particularly limited. In general, polycarbonate resin, acrylic resin, urethane resin, epoxy resin, polyvinyl chloride resin, polyolefin resin,
A styrene polycarbonate blend resin or the like is used.

As the recording material, for example, in the write-once type, an inorganic material made of a low melting point metal such as tellurium, bismuth, aluminum or an alloy thereof, or an anthraquinone type, naphthoquinone type, triphenylmethane type, carbocyanine type, merocyanine type, Organic dyes including organic dyes such as xanthene-based, azo-based, azine-based, thiazine-based, oxazine-based, and phthalo / naphthalocyanine-based dyes are generally used.
Further, a binder or the like may be used, and in addition, a rewritable erasable / writable material or a read-only material may be used.

As the adhesive and the backing material (backing material), those used for the optical recording medium can be used and do not impair the essence of the present invention.

The surface-treating agent used for the substrate or the like of the optical recording medium including the hard coating agent may be any as long as it is suitable for its purpose and material, and may be the same as the edge-treating material used in the present invention.

The above process can be applied to a disk-shaped one, and the present invention is not limited to a card-shaped one.

[0024]

EXAMPLES The present invention will be specifically described below with reference to examples. <Example 1> Hard coding was performed on a PC board for an optical card having a thickness of 0.4 mm, and a polymethylene-based material, IR-820 (Nippon Kayaku Co., Ltd.) was applied to the surface opposite to the hard coding surface of this board. As shown in FIG. 8, a recording layer was provided by removing both ends. An ethylene-methacrylic acid ester copolymer-based adhesive was used to adhere a 0.3 mm-thick polycarbonate backing material from above, and an optical card was obtained after cutting. This card was processed according to the steps shown in FIGS. First, as shown in FIGS. 1 (a) and 1 (b), the optical card 1 and the spacer 2 are alternately arranged on the pressure rotation shaft provided with the pressing jig 3, and the center and the sides of the cards are aligned with each other. After 10 sheets were placed, they were pressed down by the pressing jig 3 and the pressure rotating shaft 4. Next, as shown in FIG. 2 and FIG. 3, UV curable resin Unidec 17824-9 (Dainippon Ink and Chemicals, Inc.) was applied using a roller 5, and immediately pressurized at 1000 rpm as seen in FIG. It was rotated about the rotating shaft 4 for 1 minute. Then, as shown in FIG. 5 and FIG. 6, UV light is irradiated at a relatively slow rotation (300 rpm),
The applied UV curable resin was cured. This optical card had a strong adhesive strength even after being left for 500 hours under the conditions of 65 ° C. and a relative humidity of 85%, and the bending test shown in FIG. <Example 2> The same polymethine dye as in Example 1 was used on a 0.4 mm thick PMMA substrate for an optical card to form a band-shaped recording layer as shown in FIG. A 3 mm PMMA backing material was attached via an EVA adhesive to obtain an optical card. This card is shown in Figs.
The processing material was applied in the same manner as in Example 1 by the steps shown in. The material is silicone hard code agent, Tosgard 52
0 (Toshiba Silicone Co., Ltd.) was used.

After coating, the end face of the card is 80 to 80 mm while rotating with a far infrared heater as shown in FIGS.
It was heated to 90 ° C. for 2 hours, cured, and processed for end faces.

This optical card is a 3% solution of 90% ethanol solution.
After soaking for a minute, the recording function and appearance were not affected. <Comparative Example 1> In the optical card of Example 1, the peripheral edge is U
Optical cards prepared under the same conditions except that they were not processed with a V-curable resin were allowed to stand for 500 hours at 65 ° C. and 85% relative humidity.
Peeling from the edge occurred within 0 times. <Comparative Example 2> The optical card prepared in Example 2 was immersed in a 90% ethanol solution under the conditions of Example 1 without processing the end portion.

When it was taken out, the recording surface became uneven within 1 cm from the edge, and the recording material was eluted in the immersed ethanol solution.

[0028]

The method of processing the edges of the recording medium used in Examples 1 and 2 has some differences depending on the viscosity of the material and the energy applied, but since a plurality of media can be processed simultaneously, the productivity is improved. You can improve.

Further, according to this method, it is possible to prevent the material from flowing into the surface of the substrate or the surface of the backing material and sagging by the centrifugal force, so that the number of defective products can be reduced. Therefore, the optical disc,
In the case of a laminated type such as an optical card, where edge processing is effective, it can be said that it is a medium edge processing method that has greatly improved workability in terms of improved durability and improved adhesion.

[Brief description of drawings]

FIG. 1 (a) is a side view illustrating a step of stacking card-shaped recording media via a spacer by the method of the present invention and then pressing with a pressing shaft and a pressing jig. (B) is FIG. 1 (a)
FIG. 3 is a perspective view of the state of FIG.

FIG. 2 is an explanatory view showing a step of applying a processing material to the end portion of the card with a roller after the step of FIG.

FIG. 3 is a front view of the process shown in FIG. 2 seen from directly above.

FIG. 4 is an explanatory view showing a step of rotating the card with the pressure axis as a rotation axis after applying the processing material.

FIG. 5 is an explanatory diagram showing a process of applying energy to the rotated card end portion after applying the processing material.

6 is a front view of the process shown in FIG. 5 as seen from directly above.

FIG. 7 is a cut sectional view of an optical card.

FIG. 8 is a schematic view of an optical card in which spaces are provided at both ends of a recording layer.

FIG. 9 is a schematic view of an optical card provided in a band shape of a recording layer.

FIG. 10 is an explanatory diagram showing how to bend in a bending test.

[Explanation of symbols]

 1 Card-shaped recording medium (optical card) 2 Spacer 3 Holding jig 4 Pressing rotary shaft 5 Coating roller 6 Coating end 7 Energy generator (UV lamp) 8 Substrate 9 Recording layer 10 Adhesive layer 11 Backing material (backing material)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Chieko Mihara 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (6)

[Claims] 1. A method of processing a surface of an end portion of an optical recording medium, comprising: (1) recording surfaces of a plurality of the optical recording media are parallel to each other;
(2) Spacers are provided between each of the plurality of optical recording media, and (3) outer media on both sides of the plurality of optical recording media, with the outer contours of the respective media being positioned so as not to be displaced and in contact with each other. (4) The end surface processing material is applied to the end portions of each recording medium, (5) the outer medium on both sides of the front surface is rotated, and (6) the end portions of the medium are then pressed. A method of processing an end surface of an optical recording medium, which comprises a step of applying energy. 2. The method for processing an end surface of an optical recording medium according to claim 1, wherein the optical recording medium is an optical card. 3. The method for processing an end surface portion of an optical recording medium according to claim 2, wherein the end surface processing material is a photocurable polymer, and the energy is light. 4. The method for processing an end surface portion of an optical recording medium according to claim 2, wherein the end surface processing material is an electron beam curable polymer, and the energy is an electron beam. 5. The end surface processing material is a thermosetting polymer, and the energy is heat including infrared rays.
The method for processing the end surface portion of the optical recording medium according to. 6. The method for processing an end surface portion of an optical recording medium according to claim 2, wherein the end surface processing material is a fluorine-based compound, and the energy is heat including infrared rays.