JPS633839Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a hidden picture toy, and more particularly to a hidden picture toy in which different designs appear from the front and back sides when exposed to light.

Conventionally, print-out photographic paper made by coating paper with a spiroplan-based photosensitive substance has been used as so-called photographic paper for sunlight photography. It is used as a toy that reveals an image by exposing it to sunlight.

Further, printing paper made by coating a polyester film with a spiropyran-based photosensitive substance is used as a photosensitive film for plate making.

The inventor of the present invention has combined the action of the spiropyran-based photosensitive material used in the constituent materials of the above-mentioned sunlight photographic paper or photosensitive film for plate-making to develop color with ultraviolet rays and the action of an ultraviolet absorber. By forming the ultraviolet absorber layer in a pattern, the surface on which an image is formed due to the coloring effect of the spiropyran-based substance and the side on which an image is formed due to the two effects of the coloring effect of the spiropyran-based substance and the effect of the ultraviolet absorber. discovered that it is possible to form a hidden picture with two types of display surfaces,
The present invention was completed based on this knowledge.

That is, the gist of the present invention is that a reversible photosensitive material-containing ink layer is provided on one side of a transparent base film, and a patterned first ink layer is provided on the reversible photosensitive material-containing ink layer. The hidden picture toy is provided with the ink layer containing an ultraviolet absorber, and a patterned second ink layer containing the ultraviolet absorber is provided on the other surface of the transparent base film.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows a hidden picture toy 4 according to the present invention.

A solid ink layer 1 containing a reversible substance is provided on one surface of a transparent base film 1, and a first ink layer 2a containing a UV absorber in a negative pattern is formed on the ink layer 1 containing a reversible photosensitive substance. A negative pattern-shaped second ultraviolet absorber-containing ink layer 2b is provided on the other surface of the transparent base film 1.

When the surface 4A of the hidden picture toy 4 is irradiated with light, as shown in the second figure, the area where the first ink layer 2 containing an ultraviolet absorber of the ink layer 1 containing a reversible photosensitive substance is provided is the first ink layer 2 containing a UV absorber. Ink layer 2 containing ultraviolet absorber
Transmission of light is blocked by a, and only the portion of the reversible photosensitive substance-containing ink layer 1 where the first ultraviolet absorber-containing ink layer 2a is not provided develops color to form an image 5. .

On the other hand, when light is applied to the back surface 4B, as shown in the third diagram, a second ultraviolet absorber-containing ink layer 2b is provided through the transparent base film 3 of the reversible photosensitive substance-containing ink layer 1. Transmission of light through the area is blocked by the second ultraviolet absorber-containing ink layer 2b, and the second ultraviolet absorber-containing ink is transmitted through the transparent base film 3 of the reversible photosensitive substance-containing ink layer 1. Only the portion where the layer 2b is not provided develops color and an image 6 is formed.

In the above invention, the transparent base film includes polyolefins such as polypropylene, polyethylene, ionomers, and copolymers thereof, polyester, polyvinyl chloride, polystyrene, polyamide, cellulose acetate, cellophane, polyvinyl fluoride, acrylonitrile, and polyvinyl. Alcohols and the like can be used, among which polyesters, polypropylenes, polyamides, cellophanes and the like are suitable.

Next, in the above-mentioned present invention, spiropyrans, bisphenylimidazolyl, dinitrobenzylpyridine, azo dyes and thioindigo, salicylideneanilines, silver halides, metal oxides and different metals are used as an ink layer containing a photosensitive substance. Reversible photosensitive substances that develop color when irradiated with ultraviolet light and disappear when stored in the dark, such as spiropyrans and dinitrobenzylpyridine, are usually used in gravure inks. Natural resins such as rosin and Sierra de Copal, vinyl chloride-vinyl acetate copolymers, chlorinated rubber, cyclized rubber, methacrylate esters, polyesters, polyamides, synthetic resins such as maleic acid resins, nitrified cotton, Binders such as celluloses such as ethyl cellulose and cellulose acetate are combined with gasoline, aliphatic hydrocarbons such as n-hexane and heptane, aromatic hydrocarbons such as aromatic hydrocarbons such as benzene, toluene and xylene, methanol, ethanol, etc. Alcohols such as IPA and butanol, ketones such as acetone, MEK, MIBK, and cyclohexanone, esters such as methyl acetate, ethyl acetate, propyl acetate, butyl acetate, cellosolve acetate, ethylene glycol monomethyl ether (methyl cellosolve), cellosolve, Gravure ink is prepared by dispersing or dissolving the reversible photosensitive substance in a vehicle dissolved in a solvent such as glycol ethers such as butyl cellosolve, or an oil-based vehicle (linseed with a viscosity of about 100 poise), which is usually used in silk screen inks, is used. Oil stand oil, resin varnish made by dissolving maleic acid resin in linseed oil, dehydrated castor oil, etc., drying oil-modified alkyd resin, etc. with approximately the same amount of white spirit added), cellulose vehicles (nitrocellulose, Gravure printing method, gravure offset printing method, silk screen method using silk screen ink dispersed or dissolved in a vehicle such as ethyl cellulose, ethyl hydroxy cellulose, etc. dissolved in a solvent and an appropriate plasticizer added) It is possible to use a material printed by a printing method such as a printing method.

Next, in the present invention, the ink layer containing an ultraviolet absorber contains an ultraviolet absorber that absorbs ultraviolet light up to a wavelength of 400 mμ, such as a benzophenone substance, a benzotriazole substance, or a phenyl salicylate substance, in the conventional gravure ink as described above. A gravure printing method using a gravure ink dispersed or dissolved in a vehicle used or a silk screen ink in which the ultraviolet absorber is dispersed or dissolved in a vehicle used in conventional silk screen inks such as those described above, gravure It is possible to use a material printed by a printing method such as an offset printing method or a silk screen printing method.

In the above embodiment, the ink layer containing a reversible photosensitive substance may be formed not only in a solid pattern over the entire surface but also in a positive pattern or a negative pattern.
Further, the first and second ultraviolet absorber ink layers may be formed in a positive pattern.

Next, in the above embodiment, the ink layer containing a reversible photosensitive substance is not only formed by printing as described above, but also coated by roll coating, gravure coating, bar coating, air knife coating, etc. using a coating composition containing the reversible photosensitive substance. It is also possible to use coatings formed by ordinary coating methods such as coating and flow coating.

The above-mentioned hidden picture toy according to the present invention is sold with black paper on the front and back sides or stored in a light-shielding bag.

As described in detail above, the hidden picture toy according to the present invention is an extremely interesting toy that can make different patterns appear on the front and back by shining light on it.

Next, the present invention will be specifically explained with reference to Examples.

Example: Stretched polypropylene film as shown in Figure 4
1 on the surface of the transparent base film 3 made of 30 μm.
Using a vinyl acetate resin ink containing 1% of 3,3-trimethyl-6-nitrobenzospiropyran, a reversible photosensitive substance-containing ink layer 1 was formed on the entire surface in a solid manner according to a conventional gravure coating method. Next, as shown in Figure 5, ordinary gravure printing is performed on the reversible photosensitive material-containing ink layer 1 using a vinyl resin ink containing 15% of 2(2'-hydroxy-4'-n-octodiphenyl)-benzotriazole. A first ultraviolet absorber-containing ink layer 2a having circular openings was formed according to the method. Next, a second ultraviolet absorber-containing ink layer 2b having triangular openings was formed on the back surface of the transparent base film 3 as shown in Figure 6 in the same manner as described above, to obtain a hidden picture toy according to the present invention. When the front side of this hidden picture toy was shined with light, a circular image was formed, while when the back side was shined with light, a triangular image was formed.

[Brief explanation of drawings]

Figure 1 is a cross-sectional view of the hidden picture toy of the present invention, Figure 2
3 and 3 are sectional views showing the front and back surfaces of the hidden picture toy shown in FIG. 1 illuminated with light, and FIGS. 4 to 6 are front views showing the manufacturing process of the embodiment. 1... Ink layer containing reversible photosensitive material, 2... Ink layer containing ultraviolet absorber, 3... Transparent base film.

Claims (1)

[Scope of utility model registration request] A reversible photosensitive substance-containing ink layer is provided on one side of the transparent base film, and the first ultraviolet absorber-containing ink layer is provided in a pattern on the reversible photosensitive substance-containing ink layer. and a patterned second ultraviolet absorber-containing ink layer is provided on the other side of the transparent base film.