JPH048446Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a relief hologram. Conventionally, relief holograms formed by hot pressing a simple resin film or sheet or using an electron beam or ultraviolet ray curable resin composition are known. With conventional relief holograms, the hologram image can be viewed by irradiating it with reproduction light, but the hologram itself is generally monotonous, and when the reproduction light is not irradiated, only the colorless hologram substrate is visible. Monotony is inevitable. The present invention forms a relief hologram using a resin film, sheet, or plate, or a material in which light-reflecting particles are dispersed in an electron beam or ultraviolet curable resin composition. It can break up the monotony.

That is, the present invention relates to a relief hologram having a holographic uneven shape on the surface of a resin substrate in which light-reflecting particles are dispersed.

The present invention will be explained in detail below.
The present invention can be applied to all types of holograms such as Fresnel holograms, Fourier transform holograms, and Fraunhofer holograms, and image holograms, rainbow holograms, and holographic stereograms that utilize these hologram formats. etc., and general diffraction gratings.

As shown in FIG. 1, a relief hologram 1 according to an embodiment of the present invention has a hologram uneven shape 4 on the surface of a resin plate 3 in which light-reflecting particles 2 are dispersed.

In the above, as the light-reflecting particles 2, metal particles such as aluminum powder and silver powder, glass powder, plastic powder, etc. can be used. The particle size of the light-reflecting particles needs to be sufficiently smaller than the thickness of the resin layer of the hologram to be formed, and is suitably about 0.1 to 10 μm.
Further, as the resin plate 3, any material can be used as long as it has excellent light transmittance and is easy to form the uneven shape of the hologram.

The concavo-convex shape 4 of the hologram can be formed using a mold made by an appropriate method.

Regarding a mold for forming the uneven shape of a hologram, for example, in the case of a Fresnel hologram, a photoresist (for example, manufactured by Shipley, AZ-
1350J) to a thickness of 2.5 μm, the argon laser beam is split with a beam splitter (half mirror), one beam is applied to the object to be photographed, the reflected light (object beam) is guided onto the photoconductor, and the other beam is It can be obtained by guiding the light as it is onto the photoreceptor, exposing it by allowing it to interfere with each other, and developing it with a specified developer (for example, in the case of the photoresist mentioned above, AZ Developer made by the same company), but it is more practical. Furthermore, silver was further deposited to a thickness of about 400 Å on the original plate obtained above, and the silver-deposited film was further plated with nickel to a thickness of 1 mm, and this nickel-plated layer itself was peeled off and used as a mold. good. In the following description, the original plate and the mold are collectively referred to as a mold.

Next, a method of copying by hot pressing using the mold as described above will be described. By kneading the light-reflecting particulate matter with a resin during the film-forming process of the plastic sheet as the material to be pressed, a film, sheet, or plate in which the light-reflecting particulate matter is dispersed can be obtained. As the plastic sheet material, thermoplastic resins such as polyethylene, polypropylene, polyvinyl chloride, etc. can be used. As shown in the second figure, the hologram mold 5 is placed on, for example, a plastic sheet 3 obtained by the above method so that the mold surfaces thereof are in contact with each other, and heated by a pair of presses 6 and 6'. A relief hologram can be produced by applying pressure.

Alternatively, as shown in FIG. 3, a resin liquid 3 that can be cured by ultraviolet rays or electron beams is applied onto a hologram support sheet 7 such as a polyvinyl chloride sheet, and the resin liquid 3 that can be cured by ultraviolet rays or electron beams is applied to the coated surface. The mold surfaces of the molds are brought into close contact with each other, and ultraviolet rays or electron beams 8 are irradiated from the support sheet side to harden the resin liquid and form the mold. As the light-reflecting particulate material, metal powder, glass powder, plastic powder, etc. can be used in any of the above methods. Known methods such as roll coating, knife coating, mirror coating, gravure coating, screen printing, and pouring may be used to apply the resin liquid, and the coating thickness is determined as appropriate, taking into consideration the resin strength after curing. That's fine. It is sufficient to irradiate ultraviolet rays or electron beams directly to the coated surface, but if the mold is made of a material that allows ultraviolet rays or electron beams to pass through,
It is also possible to irradiate through the original.

In addition, resin liquids that can be cured by ultraviolet rays and electron beams include monomers, oligomers, and prepolymers that have unsaturated bonds in their molecules, as well as mixtures of epoxy compounds and Lewis acids, and sensitizers may be added if necessary. Just use it.

According to the above-described present invention, since the light-reflecting particles are dispersed, the light is reflected and shines due to the reflection according to the material of the light-reflecting particles, and the reproduction light is not irradiated as well as when the reproduction light is irradiated. Even at times, the decorative effect is enhanced by the reflection, refraction, and dispersion of external light by the light-reflecting particles, which can eliminate monotony.

Examples are given below to more specifically illustrate the present invention.

Example A 0.4 mm thick polyvinyl chloride sheet was used as a hologram support sheet, and a copper powder dispersed in an ultraviolet curable resin liquid (Letterflex #1000, manufactured by WR Grace) was applied onto the sheet. Next, the mold surface of a mold having the inverse shape of a relief hologram prepared by a conventional method is closely attached to this coated surface, and the resin is sufficiently cured by irradiating ultraviolet rays from the sheet side using an ultra-high pressure mercury lamp. When the resin layer was peeled off from the mold, a relief hologram was formed, and the relief hologram with the decorative effect of copper powder dispersed in the resin was replicated.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the present invention, and FIGS. 2 and 3 are cross-sectional views showing a method for manufacturing a relief hologram of the present invention. 2...Light scattering particulate material, 3...Resin plate, 4...
Hologram, 5...Mold, 6,6'...Press,
7...Support sheet, 8...Electron beam or ultraviolet light.

Claims (1)

[Scope of utility model registration request] A relief hologram that has a holographic uneven shape on the surface of a resin substrate in which light-reflecting particles are dispersed.