JPS63106949A - Manufacture of substrate for optical card provided with track groove - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method for manufacturing an optical card substrate with track grooves, and particularly to a card-shaped information recording carrier (hereinafter referred to as an optical card) that optically records and reproduces information. The present invention relates to a method of manufacturing a substrate with track grooves in a method of manufacturing a substrate with track grooves.

[Prior Art] Conventionally, magnetic materials have been mainly used as recording materials embedded in cards such as credit cards, bank cards, and clinic cards.

Although such magnetic materials have the advantage that information can be easily written and read, they have the problem that the information content changes easily and high-density recording is not possible. In order to solve this problem, an optical information recording method using an optical card has been proposed as a means to efficiently handle a wide variety of information, and an optical information recording carrier,
Recording/reproducing methods, recording/reproducing devices, etc. have been proposed.

Optical cards as information recording carriers generally use laser light to evaporate a part of the optical recording layer on the information recording carrier, or to cause a change in reflectance or deformation, thereby creating optical information. Information is recorded or reproduced based on the difference in reflectance or transmittance. In this case, the optical recording layer is a so-called DRAW (direct read after write), which does not require any development treatment after information is written and can be read directly after writing.
It is an effective recording medium for optical cards because it is capable of high-density recording and additional writing is possible.

FIG. 2 is a schematic cross-sectional view of a conventional optical card. Same second
In the figure, 1 is a transparent resin base material, 2 is a track groove part, and 3 is a transparent resin base material.
4 is an optical recording layer, 4 is an adhesive layer, and 5 is an opaque card base material. In Fig. 2, information is recorded and reproduced by optically writing and reading through the transparent resin base material 1 and the track groove 2, using the fine irregularities of the track groove 2, and using the phase difference of laser beams. It is configured to allow tracking.

In this method, the unevenness (usually called a track groove) serves as a guide for recording and reproducing information, which improves the accuracy of laser beam track control and enables faster access than a method using a substrate without grooves. . In addition to track grooves, preformats such as track groove addresses, start bits, stop bits, clock signals, error correction signals, etc. are also formed on the substrate surface.

Conventionally, when the substrate is made of thermoplastic resin, the method for forming these track grooves and preformats on a substrate is to thermally transfer a stamper mold using methods such as injection molding or heat press molding at a temperature above the melting point. Alternatively, after applying a photocurable resin composition onto a substrate, a stamper mold is brought into close contact with the substrate and energy such as ultraviolet rays is applied from the substrate side to cure the photocurable resin composition (hereinafter referred to as , 2P
A method is known in which a stamper mold is transferred by a method (referred to as a process method).

[Problems to be Solved by the Invention] The stamper molds used for these are conventionally made in the same manner as molds used for plastic molding. Usually, a photomask with patterns based on track grooves and preformats is created, and using this photomask, a resist pattern corresponding to these patterns is formed on a glass master disk, and after conductive treatment, nickel plating and copper are applied. It is created by plating, so-called electroforming.

Moreover, in the stamper mold used for thermal transfer method,
The copper plating must be applied quite thickly by electroforming,
The drawbacks are that many jigs are required to produce electroforming, and the molding process after electroforming is time-consuming, so it takes time and effort to manufacture the stamper mold, making the stamper mold expensive. Ta.

On the other hand, in the 2P process method, the stamper mold is 9 times thicker than in the thermal transfer method, and the manufacturing cost of the stamper mold is reduced accordingly.

The cost of the stamper mold is still a big problem.

In addition, even in the 2P process, the stamper mold created as described above has no translucency because it is metallic.
Patterns such as track grooves and preformats could not be formed on a substrate other than by irradiating light from the substrate side. Therefore, in the case of a substrate containing an ultraviolet absorber,
Even with the 2P process, it was not possible to form satisfactory patterns such as track grooves and preformats.

The present invention is an optical information recorder Q41! In order to overcome the above-mentioned problems with stamper molds used to form track grooves and preformats on substrates in the production of substrates, we have developed a system that can eliminate ultraviolet absorbers by using translucent stamper molds. It is an object of the present invention to provide a method for manufacturing a substrate for an optical card with track grooves, which allows the 2P process to be performed even on a substrate with track grooves.

[Means for Solving the Problems] In other words, the present invention (5) involves coating a photocurable resin mixture on a transparent resin base material, pressing a transparent stamper mold having a concavo-convex pattern thereon, and then applying the transparent stamper mold to the transparent resin base material. Production of an optical card substrate with track grooves, characterized in that the photocurable resin mixture is fixed by irradiating ultraviolet rays from the photosensitive stamper mold side to form tracking grooves on a transparent resin base material. It's a method.

Hereinafter, the present invention will be explained in detail using the drawings.

1(a) to (c) are schematic process diagrams of the method for manufacturing an optical card substrate with track grooves of the present invention, in which 1 is a transparent resin base material, 6 is a photocurable resin mixture (hereinafter referred to as resin mixture). ), 7 is a translucent stamper type, 8 is an ultraviolet ray, and 9 is a completed optical card substrate with track grooves.

During the process of forming patterns such as track grooves and preformats on the transparent resin base material l, first, as shown in Fig. 1(a),
A resin mixture 6 is applied onto a transparent resin substrate l. As a coating method, known methods such as roll coating, spin neat coating, dip coating, etc. can be used.

Next, as shown in FIG. 1(b), a translucent stamper mold 7 is pressed onto the resin mixture 6, and the resin mixture 6 is accommodated in the recess 10, which is a groove of the translucent stamper mold 7. ,
The surface of the convex portion 11 of the translucent stamper mold 7 is brought into close contact with the resin mixture 6, and ultraviolet rays 8 are irradiated from the side of the translucent stamper mold 7 to cure the resin mixture 6 onto the transparent resin base material 1. Fixed on top.

FIG. 1(C) shows the optical card substrate 9 with track grooves after removing the translucent stamper mold 7, and the groove depth 9 width, precision, pitch interval, etc. Since the shape is a transfer of the mold 7, if the grooves of the translucent stamper mold 7 are precisely finished, an optical card substrate 9 with track grooves having an arbitrary shape can be obtained as shown in FIGS. 1(a) to (C). It can be manufactured by a simple process as shown.

As the transparent resin base material 1 used in the present invention.

A material with few inconveniences in optical recording and reproduction is preferable, and it needs to be a material with high smoothness, high transmittance of the laser beam used for recording and reproduction, and low birefringence.0Usually, For example, acrylic resin, polyester resin, polycarbonate resin, vinyl resin, polystyrene resin, polyimide resin, polyacetal resin, polyolefin resin, polyamide resin, cellulose derivative, etc. are used. In particular, acrylic resins (various methacrylate copolymer resins) and polycarbonate resins are preferred because they have good laser light transmittance and low birefringence.The transparent resin base material 1 usually has a layer of 0.3 to 0.5j. It is used by molding into a thick and smooth Heisei sheet.

The resin mixture used in the present invention may be one that is commercially available as one that can be used in the known 2P process, and includes various monofunctional or polyfunctional monomers, oligomers, polymers, mainly (meth)acrylate, It contains various other additives as necessary, such as an organic solvent to adjust the viscosity during coating formation, a non-reactive polymer to adjust the flexibility and hardness of the coating, and a curing means. Sensitizers, polymerization initiators, fillers, and silane coupling agents needed to improve adhesion when exposed to ultraviolet light.

A material containing a titanium coupling agent or the like is used.

In any case, it is sufficient that the stamper does not lose its translucency after molding, has a refractive index difference of 0.05 or less with the transparent resin base material 1, has good adhesion to the transparent resin base material 1, and has good adhesiveness with the transparent resin base material 1. - It is necessary to have good a-type characteristics.

The light-transmitting stamper mold 7 used in the present invention is a light-transmitting stamper mold consisting of a concavo-convex pattern, and a photomask consisting of patterns such as track grooves and preformats is used to stamp a glass substrate or stone. A known photolithography process is applied to a transparent substrate such as a substrate coated with a resist, and a resist pattern is formed on the transparent substrate, and the resist pattern is used as a mask to form a transparent substrate (desired 17). It can be obtained by etching to ff and peeling off the resist pattern. Alternatively, by using the above photomask pattern (usually a pattern made of a thin chromium film), etching the light-transmitting part of the photomask substrate to a desired depth, and then peeling off the pattern (chromium pattern). You can also get The latter method is highly advantageous because the transparent stamper mold of the present invention can be produced in a short time.

The obtained translucent stamper mold has a track groove depth of 0.000 nm when recording/reproducing an optical card using a semiconductor laser having a wavelength of 700 to 900 n+s.
1 to 0.18 pm is preferred. Further, the track groove as a pattern on the stambar mold generally has a groove width of 2 to 4 mm, and the recording portion generally has a width of 3 to 111 tons. In this case, in the uneven pattern obtained after the 2P process,
It is preferable that the concave portions be track grooves, and in the case of a translucent stand bar type, it is desirable that the track groove portions be a convex portion, a recording portion, or a four-part pattern.

[Function] The method for manufacturing an optical card substrate with track grooves of the present invention involves coating a resin mixture on a transparent resin base material, pressing a translucent stand bar mold having a concavo-convex pattern on top of the resin mixture, and then applying the resin mixture to the transparent resin base material. The resin mixture is cured and fixed on the transparent resin base material by irradiating ultraviolet rays from the side of the photosensitive stand bar mold.

By using a translucent stanbar type, stanbar
It becomes possible to irradiate ultraviolet rays from the mold side, and the degree of freedom in the 2P process increases without depending on the physical properties of the transparent resin base material. Tracking grooves, preformats, etc. can be easily filled with ultraviolet absorbers, for example. It can also be molded onto a transparent resin base material.

[Examples] The present invention will be explained below using Examples, but the present invention is not limited thereto in any way.

Example 1 Method for manufacturing a translucent stanbar mold A negative deep ultraviolet resist (R
D-200ON, manufactured by Hitachi Chemical Co., Ltd.) was coated with a T film to a thickness of 0.65 bar using a spin code, and well-collimated deep ultraviolet light with a wavelength of 290 nm was applied to a photomask consisting of track grooves and a preformat pattern. After being exposed to light through the resist film, the resist was developed using a developer (RD-Developer 1 manufactured by Hitachi Chemical) to form a cured resist pattern.

A quartz glass substrate was dry etched using the resist pattern as a mask. The etching conditions were as follows: CF, (16,83(:CM)) was used as the etching gas.
Etching pressure cuff Pa, RF power 0.16W/cm”
, etched for 7 minutes and set the etching depth to 0 and 1.
:1 gm.

After that, remove the resist pattern with a remover (Microposit Remover 140, manufactured by Sibley Co., Ltd.) at 80°C.
Peel it off in an ultrasonic cleaner for 5 minutes and place it on a quartz glass substrate at a depth of 0.1 lps and a width of 9 concave portions and 3 convex portions.
A translucent stand bar mold with a concavo-convex pattern of I was manufactured.

Manufacturing method of transparent resin substrate with O-track groove Thickness 0.4m
70 parts by weight of neopentyl glycol diacrylate, 70 parts by weight of neopentyl glycol diacrylate, bisphenol-based epoxy acrylate [Epicoat 828 (trade name, manufactured by Yuka Shell Epoxy ■) and acrylic on a polycarbonate plate containing a UV absorber (Panlite 211, manufactured by Teijin Kasei Koji). A photocurable resin mixture consisting of 30 parts by weight of acid-added bifunctional acrylate and 1 part by weight of benzoin isopropyl ether was roll coated to form a coating film with a thickness of 70 mm.

The above-mentioned translucent stanbar mold was pressed onto the formed coating film of the resin mixture, and the resin mixture was placed in the groove of the translucent stambar mold and brought into close contact with the resin mixture.

Irradiation power 10mW/cs from the translucent stanbar type side
The resin was cured by exposing the resin to a high-pressure mercury lamp of 100 mL for 10 minutes.The polycarbonate plate was peeled off from the translucent stand bar mold to produce a transparent resin substrate with track grooves.

[Effects of the Invention] As described above, in the present invention, by performing a 2P process using a translucent stanbar mold, the translucency of the substrate is not involved in forming the uneven pattern. There is an advantage that the degree of freedom in substrate selection is increased, and in particular, a transparent resin substrate containing an ultraviolet absorber can be used as a substrate material for an optical card.

Furthermore, since the translucent stubber mold can be produced relatively easily and in a short time, the manufacturing cost of the translucent stubber mold can be reduced, making it possible to reduce the manufacturing cost of the optical card.

[Brief explanation of the drawing]

FIGS. 1A to 1C are schematic process diagrams of a method for manufacturing an optical cart substrate with track grooves according to the present invention, and FIG. 2 is a schematic cross-sectional view of a conventional optical card. 1-...Transparent resin base material 2...Track groove part 3
... Optical recording layer 4 ... Adhesive layer 5 ... Opaque cart base material 6 ... Photocurable resin mixture 7 ... Transparent stand bar type

Claims (1)

[Claims] A photocurable resin mixture is applied onto a transparent resin base material, a translucent stamper mold having a concavo-convex pattern is pressed onto it, and then ultraviolet rays are irradiated from the side of the translucent stamper mold to cure the photocurable resin. A method for producing an optical card substrate with a track groove, which comprises fixing a resin mixture and forming a tracking groove on a transparent resin base material.