JPS5983110A - Reproduction of patterned diffraction grating - Google Patents

Abstract

PURPOSE:To enable efficient reproduction of a patterned diffraction grating at a low cost by bringing a mold for reproducing the diffraction grating into tight contact with the surface of a base body formed thereon with a compsn. curable by an ionizing radiation into a patterned shape and irradiating an ionizing radiation. CONSTITUTION:A compsn. curable by an ionizing radiation is coated on the surface of a base body 1 into a patterned shape to form a pattern 2. A mold 3 for reproducing a diffraction grating is brought into tight contact with such surface and an ionizing radiation 4 is irradiated from the side of the mold 3. The mold 3 is then detached whereby fine ruggedness 5 of the diffraction grating is reproduced on the surface of the pattern 2. A mold obtd. by hot pressing a prototype onto a thermoplastic resin sheet or further adhering tightly a curable resin liquid on the prototype and curing the same by heat, UV light or electron ray can be utilized for the mold for reproduction which has transmittability of said ionizing radiations. There may be mentioned a monomer and oligomer having an unsatd. bond in a molecule as the compsn. curable by the ionizing radiation. Various printing methods may be used in coating and forming the pattern on the surface of the base body. The preferable ionizing radiation is UV light with which a device is simple, and an electron ray which has a high transmission power.

Description

[Detailed description of the invention] It is something to do.

Diffraction gratings cause a diffraction phenomenon in transmitted light or reflected light obtained by irradiating light, and in addition to being used as optical components, they can also be used as decorative items by utilizing the rainbow colors seen when irradiated with white light. It is widely used and has high utility value.

There are various methods for producing diffraction gratings, such as glazing methods.For example, a mechanical method is such that the surface of the material is formed at intervals of 0. Sμ〜S
There is a method of cutting micro-sized striped irregularities using a diamond cutter, etc., and a photochemical method involves exposing a photosensitive material such as a photoresist to interference fringes using a laser beam, etc., and developing it. There is a way.

However, although all of the above methods are suitable for obtaining the diffraction grating itself, it is extremely inefficient to use these methods for mass production, as well as in terms of materials used and running costs. Therefore, when mass producing diffraction gratings, it is recommended to create a reproduction mold using the diffraction grating obtained by the above method as a prototype, and then use the reproduction mold to form an appropriate material. Be efficient. Using a duplication mold like this makes it easy to reproduce diffraction gratings, but what is the purpose of using diffraction gratings other than for decorative purposes? - It is more decorative to form it in a pattern rather than just forming it on a surface.
Furthermore, it is necessary to produce the prototype, and each time it is necessary to rely on the above-mentioned mechanical method or photochemical method, which is inefficient and uneconomical.

The present invention compensates for the above-mentioned drawbacks of the conventional art, and is such that, after forming an ionizing radiation-curable composition into a pattern, using a mold for replicating a diffraction grating and irradiating with ionizing radiation, This work was completed as a result of research by duplicating various patterns of diffraction gratings using the same mold for duplicating diffraction gratings and discovering scales.

That is, the method for replicating a patterned diffraction grating according to the present invention involves preparing a small substrate (one of which is transparent to ionizing radiation) and a mold for replicating a diffraction grating, as described in detail below. Applying a curable composition in a pattern,
The diffraction grating duplication mold was brought into close contact with the coated surface, and then ionizing radiation was applied from the side of the substrate or the diffraction grating duplication mold that was transparent to ionizing radiation to form the pattern. The method is characterized in that the ionizing radiation-curable composition is cured and shaped, and then the diffraction grating duplication mold is removed.

Hereinafter, the method of the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing a state in which an ionizing radiation-curable composition is applied in a pattern onto the surface of a substrate 1 to form a pattern λ in the method of the present invention. FIG. 2 is a sectional view showing a state in which the diffraction grating duplication mold 3 is brought into close contact with the pattern λ of FIG. 1 and ionizing radiation is irradiated from the side of the diffraction grating duplication mold 3. Furthermore, FIG. 3 is a cross-sectional view showing the state in which the fine irregularities S of the diffraction grating are replicated on the surface of the pattern after the mold 3 for copying the diffraction grating is removed after irradiation with ionizing radiation as shown in FIG. 9. be.

In the method of the present invention, first, a substrate (at least one of which is transparent to ionizing radiation) and a mold for replicating a diffraction grating are prepared.

[Basic body]

The substrate may be a glazed plastic film, sheet or plate, a metal or a composite,
Alternatively, molded products may be used, and these substrates may be subjected to appropriate surface treatment as necessary in order to improve the adhesive strength after curing with the ionizing radiation curable composition described below. A substrate having a vapor-deposited metal thin film formed on its surface is preferable in view of the decorative effect of the diffraction grating.

The irradiation with electric radiation described below is carried out from the side of either the substrate or the mold for copying the diffraction grating, which is transparent to ionizing radiation, but when the substrate is a plastic film, sheet, or plate, it is necessary to irradiate the side of the substrate or the mold for copying the diffraction grating, which is transparent to ionizing radiation. Since it has , it can be irradiated from the substrate side.

[Diffraction grating duplication mold]

Various types of diffraction grating replicating molds can be used. For example, a model is prepared by a mechanical method or a photochemical method as described above, (a) the obtained model is plated to form a plating layer, and then the plating layer is peeled off. b) Those made by hot pressing the prototype onto a thermoplastic resin sheet, and even e-1w, by applying a curable resin liquid to the mold,
Those obtained by curing with heat, ultraviolet rays, electron beams, etc. can be used.

In the above, when the diffraction grating duplication molds (b) and (c) are used, the ionizing radiation can be irradiated from the side of the diffraction grating duplication mold because they are transparent to ionizing radiation.

An ionizing radiation curable composition is coated in a pattern on the surface of the above-mentioned substrate. Oligomers and V polymers, etc.
There are mixtures of epoxy compounds and Lewis acids, etc., and if necessary, a sensitizer may be added and used at °C.

The above-mentioned ionizing radiation-curable composition can be applied and formed into a pattern on the surface of a substrate by various printing methods, such as gravure printing, offset printing, letterpress printing, flexo printing, screen printing, etc., or by hand drawing. The radiation curable composition and the type of substrate may be used by appropriately selecting one and used. (A printing plate having an appropriate pattern can be produced by a well-known method.

Bringing the diffraction grating duplication mold into close contact with the pattern of the substrate on which the ionizing radiation curable composition is provided in a pattern,
Next, ionizing radiation is irradiated from the side of the substrate or the mold for copying the diffraction grating that is transparent to ionizing radiation. When bringing the diffraction grating duplication mold into close contact with the pattern on the base, it is preferable to apply pressure using a flat press or a roll press.

As the ionizing radiation, ultraviolet rays, electron beams, xH1γ rays, neutron beams, etc. can be used, but ultraviolet rays, which are easy to use, and electron beams, which have high penetrating power, are preferred. The ionizing radiation-curable composition formed in the pattern described above is cured by irradiation with ionizing radiation, and then the diffraction grating duplication mold is removed to obtain a patterned diffraction grating on the surface of the substrate.

According to the present invention described above, although a patterned diffraction grating can be obtained, there is no need to pay for the production of a master model or a copying mold each time (by patterning the ionizing radiation curable composition in advance,
Patterned diffraction gratings with arbitrary turns can be produced easily and efficiently.

Example thickness: 0. ．． A UV curable resin (A, P%R1 Asahi Kasei 4-) was applied in a pattern onto a 2 m triacetate film by screen printing.

Next, the above-mentioned film, which was a mold having a diffraction grating engraved with fine irregularities on its entire surface, was superimposed on the turned surface of the mold, and passed between two rolls under pressure to bring them into close contact. Furthermore, when the film was irradiated with ultraviolet rays using an ultra-high-pressure mercury lamp and the ultraviolet curing resin was cured, the film was peeled from the mold, and a cross-shaped diffraction grating was recorded on the film.

[Brief explanation of the drawing]

1 to 3 are cross-sectional views showing each step of the present invention. 10 competitions... base 20... pattern 3...
...Diffraction grating duplication mold...Ionizing radiation S...Concave Convex Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] (11) Prepare a substrate and a mold for replicating a diffraction grating, at least one of which is transparent to ionizing radiation, coat the surface of the substrate with an ionizing radiation-curable composition in a pattern, and apply the replica of the diffraction grating to the coated surface. The ionizing radiation curable composition is applied in the pattern by bringing the mold into close contact with the mold, and then irradiating the ionizing radiation from the side of the substrate or the diffraction grating 7W mold that is transparent to ionizing radiation. 1. A method for replicating a patterned diffraction grating, comprising curing and forming the diffraction grating, and then removing the mold for replicating the diffraction grating.