JPH0365527B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a white screen for obtaining an image by irradiation with visible light and ultraviolet light, and a method for displaying an image on the white screen.

(Prior Art) Conventionally, in order to obtain a projected image using a visible light source,
Reflective screens made of substrates made of white paper, cloth, metal, glass, board, plastic, etc., or coated with fine glass beads, etc., have been known. These project a single image using visible light, and are commonly used for movies, slides, advertisements, etc.

On the other hand, there is also a method in which a pattern is drawn using fluorescent ink or fluorescent paint containing chromatic organic fluorescent pigments such as red or yellow, and then the pattern is excited and colored by irradiation with ultraviolet rays in a dark environment. Are known. However, in this case, the drawn pattern itself already exhibits a chromatic color under visible light, so the screen on which such a pattern was drawn no longer functions as a white screen.

(Problems to be Solved by the Invention) As mentioned above, the commonly used white screen is only used for projecting a single image using a visible light source, and on the other hand, a chromatic organic fluorescent pigment is used. This screen had the problem that it could not be used as a white screen because it exhibited chromatic colors under visible light.

However, recently various events, advertisements,
In advertising, stage art, etc., a single image using visible light or a simple colored image using ultraviolet light excitation of an organic fluorescent pigment tends not to have a strong visual impact on the audience. For this reason, there is a growing demand for screens that can produce composite images that have a stronger impact, or that can be used in multiple ways, both temporally and spatially.

(Means for Solving the Problems) In view of the current situation as described above, the inventors of the present invention, as a result of intensive studies to solve the various problems described above, have developed a screen that can be used in multiple ways, and a screen that can be used in multiple ways. They discovered a method for displaying images and arrived at the present invention. That is, the present invention uses a composition containing an inorganic phosphor that emits light with ultraviolet rays on a substrate,
A white screen with a pattern that appears white under visible light, and a white screen with a pattern that appears white under visible light, and a
Projected image and wavelength by visible light source from 400 to 780 nm
The present invention provides a method for producing an image, which comprises irradiating ultraviolet light with a wavelength of 300 to 400 nm.

The present invention will be explained in detail below.

First, as the "substrate" used in the screen of the present invention, all materials that are generally used as substrates for screens, such as paper, cloth, metal, glass, plastic, and various boards, can be used. However, in the present invention, in order to irradiate ultraviolet rays,
Substrates containing no fluorescent pigments or fluorescent dyes on their surfaces are suitable for use. In addition, the color of the substrate is almost white (in the present invention, "white" is used to obtain contrast of the image, and therefore, in addition to complete white, so-called so-called pale gray, pale yellow, pale blue, etc.) Of course, it also includes off-white).

The "inorganic phosphor that emits light in ultraviolet light" used in the present invention is one that emits light in ultraviolet light with a wavelength of 300 to 400 nm, although any phosphor that emits light in the ultraviolet region can be used. More specifically, the inorganic phosphor that emits light under ultraviolet light has a wavelength of
A red-emitting inorganic phosphor that emits light with ultraviolet light of 300 to 400 nm and has an emission peak in the range of 600 to 660 nm (hereinafter simply referred to as "R phosphor"), and a green-emitting inorganic substance that emits light in the range of 490 to 560 nm. The phosphor (hereinafter simply referred to as "G phosphor") has an emission peak of
It is preferable to use an inorganic phosphor that emits blue light in the range of 390 to 460 nm (hereinafter simply referred to as "B phosphor").

Examples of the R phosphor include Y ₂ O ₃ :Eu (emission peak: 611 nm; the same applies hereinafter), YVO ₄ :Eu (619),
_{Y2O2S :} Eu(626), 3.5MgO, _{0.5MgF2GeO2 :}
Examples include Mn (660), (Y, Gd) BO ₃ :Eu (611), and the like. These may be used alone or as a mixture of two or more.

Examples of the G phosphor include ZuS:Cu, Al
(530), (Zn, Cd)S:Cu, Al (530-560),
ZuS: Cu, Au, Al (535), Zn ₂ SiO ₄ : Mn (525),
ZuS:Ag, Cu(527), (Zn,Cd)S:Cu(525),
ZuS: Cu (530), Gd ₂ O ₂ S: Tb (544), La ₂ O ₂ S:
Tb(544) _{, Y2SiO5} : Ce, Tb( ₅₄₄ ), _Zn2GeO4 :
Mn (533), CeMgAl ₁₁ O ₁₉ : Tb (543), SrGa ₂ S ₄ :
Eu ²⁺ (535), ZuS:Cu, CO (516), MgO・
_nB2O3 : Ce, Tb (544), LaOBr: _Tb , Tm
(544), La ₂ O ₂ S:Tb (544), etc. These may be used alone or as a mixture of two or more.

As the B phosphor, ZnS:Ag(450),
_CaWO4 (425), _Y2SiO5 :Ce ( ₄₁₀ ), ZnS:Ag,
Ga, Cl (450), _{Ca2B5O9Cl :} Eu2 ⁺ ( ₄₅₀ ),
Examples include BaMgAl ₁₄ O ₂₃ :Eu ²⁺ (454). Note that these may be used alone or as a mixture of two or more.

The inorganic phosphor that emits light under ultraviolet light used in the present invention has a particle size of about 2 to 30 microns, preferably about 3 to 15 microns. The inorganic phosphor can be appropriately selected and used depending on the purpose, environmental conditions (humidity), etc.

It goes without saying that phosphors whose surface has been treated with a surface treatment agent such as silicone or fluorine, or a resin, etc. for the purpose of improving atmospheric humidity and weather resistance can also be used as long as they do not depart from the purpose of the present invention. There is no such thing.

In the present invention, the inorganic phosphor as described above is R
As a single color for each phosphor, G phosphor or B phosphor, or as necessary, R phosphor, G phosphor,
It is also possible to mix and use the three primary colors of the B phosphor in any proportion. These phosphors are usually dispersed in a color vehicle and used as an ink or coating composition.

As the color vehicle, thermoplastic resins such as acrylic resins, vinyl resins, urethane resins, alkyd resins, polyester resins, fluorocarbon resins, etc., which are usually used as color vehicles for inks or paints, and thermosetting resins may be used as necessary. Available for use. A material with good adhesion to each substrate may be selected from these materials.

The composition containing an inorganic phosphor used in the present invention includes the inorganic phosphor, a coloring agent, and, if necessary, a solvent commonly used in inks or paints (e.g., aromatic, ketone, ester, etc.). etc.), various additives (for example, dispersants, antifoaming agents, etc.), plasticizers, etc. An example of these compositions is 20 to 60% by weight of inorganic phosphor;
Examples include compositions containing 20 to 60% by weight of color vehicle, 10 to 50% by weight of solvent, and 0.5 to 10% by weight of other additives, plasticizers, etc. Such a composition can be obtained by mixing each component by a conventional method such as stirring and mixing.

The thus obtained composition containing the inorganic phosphor is applied onto a substrate to draw an arbitrary pattern. In the present invention, the term "pattern" refers to characters, symbols,
This includes all drawings, photographs, and other abstract patterns.

The means for drawing the pattern include various known means such as hand drawing using a brush, brush, spray, roller, spatula, tampo coating, etc.; printing using silk printing, offset printing, gravure printing, etc.; and marking systems using other special drawing machines. Any method may be used.

In particular, if the original image is separated into three colors, a three-color printing plate is created, and a halftone printing method is used, colors that are faithful to the original image can be reproduced and more favorable results can be obtained. The pattern thus obtained appears almost white under visible light because the inorganic phosphor is almost colorless. The image forming method of the present invention includes irradiating the white screen obtained as described above with a projected image from a visible light source with a wavelength of 400 to 780 nm and ultraviolet rays with a wavelength of 300 to 400 nm, preferably in a dark environment. It is what it is.

The image projected by the visible light source in the method is
Ordinary movies, slides, etc. may be used, and ultraviolet ray irradiation is performed, for example, by Bratz clamp irradiation. Further, in the above-described image display method of the present invention, the image projection by the visible light source and the ultraviolet ray irradiation may be performed simultaneously or may be performed alternately.

The former, i.e. the projection of an image by a visible light source;
When irradiated with ultraviolet light at the same time, the pattern drawn by the inorganic phosphor-containing composition emits light due to the excitation of the inorganic phosphor by the ultraviolet rays, and becomes an excited image, as well as the area that is hit by the projected image by the visible light source. The result is a projected image in which the excitation image disappears or is attenuated due to extremely bright areas and additive mixing. In other words, the images are combined and a very fantastic image is obtained.

In addition, if the latter, that is, image projection by a visible light source and ultraviolet ray irradiation are performed alternately, on a single screen,
For example, the screen can be used in multiple ways, allowing you to view completely different images alternately. Of course, it is also possible to view only the excitation image by irradiating the screen of the present invention with only ultraviolet rays.

In addition, since the screen of the present invention can provide more resistance (e.g., moisture resistance, weather resistance) to the conditions of the environment in which it is used, lamination treatment,
Clear paint may also be applied.

The present invention will be specifically explained below using examples.
Parts or percentages refer to parts or percentages by weight.

Example 1 40 parts each of _Y2O2S :Eu as _a red-emitting phosphor, _Zn2GeO4 :Mn as a green-emitting phosphor, and _Ca2B5O9Cl : ^Eu2+ _{as a} blue _- emitting phosphor. Color vehicle used (6:4 ratio of polyester resin and acrylic resin)
mixture) 30 parts, solvent (cellosolve acetate/methyl isobutyl ketone/xylol = 90/5/5
25 parts of the mixture) and 5 parts of the others (dispersant, antifoaming agent, plasticizer) were stirred and mixed to form a composition A containing a red light-emitting phosphor, a composition containing a green light-emitting phosphor B, and a composition containing a blue light-emitting phosphor. Each composition C was prepared. First, a color photograph of a forest is separated into three colors: red, green, and blue.
After further screen resolution and generation of three-color printing plates, the above A, B and C compositions were used to silk screen print on paper. The resulting screen had a paper substrate and was white overall, although it had a slight yellowish tinge.

After installing the screen in a dark place, use a Bratz clamp to irradiate ultraviolet light with a wavelength of 300 to 400 nm to create a fantastic light source color.
An image of the forest was obtained.

Then, under the ultraviolet irradiation, the wavelength is 400 to 780n.
A projected image of a yellow butterfly was projected by a visible light source of m. In this way, a beautiful screen was obtained in which a yellow butterfly, whose color was reflected by a visible light source, was flying through a forest under ultraviolet irradiation using the light source color of the inorganic phosphor.

Example 2 A green-emitting phosphor-containing composition D was obtained in the same manner as in Example 1 using ZnS:Cu and Al as the green-emitting phosphor. The compositions A and C above were used as the red and blue emitting phosphor-containing compositions. An arctic landscape (color illustration) with a polar bear on the ice and a seal in the sea was created in the same way as in Example 1, with A, C, and D.
The composition was used to silk screen print onto paper. The screen obtained was almost white. After installing the screen in a dark place, a beautiful arctic landscape was obtained by first irradiating the screen with ultraviolet light with a wavelength of 300 to 400 nm using a Bratz clamp. Next, the front of the Bratz clamp was shielded by a shutter, and at the same time an image of Africa consisting of a herd of elephants and striped horses was projected from a visible light source. In this way, it was possible to alternately produce an image of the North Pole using fantastic light source colors and an image of Africa using sharp, realistic reflected light on the same screen.

(Effects of the Invention) The white screen of the present invention is a screen that can produce extremely fantastic and dramatic images or can be developed in many ways by obtaining an excitation image using ultraviolet rays and a static or moving image using a visible light source. It becomes a possible screen. Therefore, it is not only highly aesthetic, but also suitable for various events, advertisements,
It exhibits a strong visual effect in advertising, stage art equipment, etc., and can therefore be widely applied.

Claims (1)

[Scope of Claims] 1. A pattern that appears white under visible light is drawn on a substrate by a composition containing an inorganic phosphor that emits light under ultraviolet light, and an image emitted by ultraviolet light of 300 to 400 nm and a projection using visible light. A white screen that can display images. 2. At least one composition selected from a composition containing a red-emitting inorganic phosphor that emits light under ultraviolet light, a composition containing a green-emitting inorganic phosphor that emits light under ultraviolet light, and a composition containing a blue-emitting inorganic phosphor that emits light under ultraviolet light. A white screen according to claim 1, characterized in that it consists of a composition of seeds. 3 Red-white inorganic phosphors that emit light under ultraviolet light emit light under ultraviolet light with a wavelength of 300 to 400 nm, and the emission peak is
The white screen according to claim 2, characterized in that the wavelength is in the range of 600 to 660 nm. 4 Green-emitting inorganic phosphors that emit light in ultraviolet light emit light in the wavelength range of 300 to 400 nm, and the emission peak is
The white screen according to claim 2, characterized in that the wavelength is in the range of 490 to 560 nm. 5 Blue-emitting inorganic phosphors that emit light in ultraviolet light emit light in ultraviolet light with a wavelength of 300 to 400 nm, and the emission peak is
The white screen according to claim 2, characterized in that the wavelength is in the range of 390 to 460 nm. 6. A pattern that appears white under visible light is drawn on a substrate using a composition containing an inorganic phosphor that emits light under ultraviolet light, and an image emitted by ultraviolet light of 300 to 400 nm and a projected image using visible light can be obtained. An image display method comprising projection using a visible light source with a wavelength of 400 to 780 nm and irradiation of ultraviolet rays with a wavelength of 300 to 400 nm onto a white screen. 7. Projection using a visible light source with a wavelength of 400 to 780 nm,
7. The method for producing an image according to claim 6, wherein irradiation with ultraviolet light having a wavelength of 300 to 400 nm is performed simultaneously. 8. Projection using a visible light source with a wavelength of 400 to 780 nm,
7. The method for producing an image according to claim 6, wherein the irradiation with ultraviolet rays having a wavelength of 300 to 400 nm is performed alternately. 9. At least one composition selected from a composition containing a red-emitting inorganic phosphor that emits light in ultraviolet light, a composition containing a green-emitting inorganic phosphor that emits light in ultraviolet light, and a composition containing a blue-emitting inorganic phosphor that emits light in ultraviolet light. 7. The method for producing an image according to claim 6, characterized in that the method comprises a composition of: 10 A red-emitting inorganic phosphor that emits light under ultraviolet light is
10. The method for producing an image according to claim 9, wherein the method emits ultraviolet light having a wavelength of 300 to 400 nm, and has an emission peak in the range of 600 to 660 nm. 11 Green-emitting inorganic phosphor that emits light under ultraviolet light is
10. The method for producing an image according to claim 9, wherein the method emits ultraviolet light having a wavelength of 300 to 400 nm, and has an emission peak in the range of 490 to 560 nm. 12 A blue-emitting inorganic phosphor that emits light under ultraviolet light is
10. The method for producing an image according to claim 9, wherein the method emits ultraviolet light having a wavelength of 300 to 400 nm, and has an emission peak in the range of 390 to 460 nm.