JP2000089370A - Transmission type projection screen and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transmission type projection screen which is free from the degradation in the contrast of projected images, the generation of hot spots and the degradation in brightness and is wide in a range to allow the appreciation of the projected images by diffusing light. SOLUTION: This transmission type projection screen is provided with black stripe 14 layer parts in the portions where the projected light from projection is not transmitted and light diffusion layer parts 16a by foaming only in the portions where the light is transmitted on the flat surface side of a lenticular sheet 10 which is provided with cylindrical lenses in juxtaposition on one surface and the other surface is a flat surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission type projection screen used for a projection television having an improved light diffusion layer having a function of forming an image of a projection light from a projector, and diffusing and transmitting the light.

[0002]

2. Description of the Related Art As a general form of a transmission type projection screen, as shown in FIG. 2, it is composed of a combination of a Fresnel lens (20) and a lenticular sheet (10). The viewer (40) has a light diffusion layer having a function of forming an image, diffusing light, and transmitting the light, and a viewer (40) views an image from a side facing the position of the projector.

[0003] The lenticular sheet can spread the projection light in a predetermined range in the direction (horizontal direction) in which the cylindrical lenses are arranged, but can hardly spread the projection light in the vertical direction. A light diffusing layer is required to have the auxiliary role of spreading the projection light in the horizontal direction (the juxtaposition direction) and the role of spreading the considerable amount of light in the vertical direction. In addition, the light diffusion layer also has a role of eliminating hot spots, which is a phenomenon in which the luminance of the central point of the projection light becomes considerably high and looks like a stripe, so as to make the brightness of the screen uniform.

It is known to disperse and mix light diffusing fine particles having different refractive indices into a light transmitting resin in order to provide a light diffusing function, and the following methods are available for obtaining light diffusing characteristics. One kind or two or more kinds of fine particles having light diffusing property are kneaded in a lenticular sheet molded article to improve the viewing angle characteristics in the vertical direction.
No. pp. 147-64. Instead of having a light diffusing layer on the Fresnel lens or lenticular sheet, one or more kinds of light diffusing fine particles are kneaded into the front panel located closest to the observer, Japanese Patent Application Laid-Open Nos. Hei 6-273852 and Hei 7-24837 propose a method in which a resin mixed with light diffusing fine particles is coated on the surface to improve the contrast and improve the viewing angle characteristics.

[0005] These two types of proposals are methods for diffusing incident projection light by fine particles inside a lenticular sheet, but there are some problems. (1) By using a large amount of diffusing fine particles, stray light of projection light is generated, which causes a decrease in resolution and also causes a decrease in contrast due to a decrease in the amount of projection light (image light). (2) By dispersing and mixing diffusible fine particles, problems such as poor appearance of the lens sheet, reduction in molding accuracy, and insufficient strength also occur.

The above-mentioned method is a method of diffusing incident projection light with fine particles on a front panel, but has some problems. (1) By internally dispersing and blending diffusible fine particles,
Problems such as poor appearance of the front panel, reduction in molding accuracy, and insufficient strength will occur. (2) When printing diffusible fine particles on the front panel, it is difficult to control the thickness of the diffusion layer on the order of μm, which can provide high resolution. Cause problems.

[0007]

SUMMARY OF THE INVENTION In the present invention, attention has been paid to the above-mentioned problems, and there is no decrease in contrast of a projected image, no generation of hot spots, no decrease in sharpness, and light is diffused. An object of the present invention is to provide a transmission type projection screen having a wide range in which a projected image can be viewed.

[0008]

According to the present invention, there is provided an image light having a substantially flat surface, which is on a light exit side of a projected image of a single-sided lenticular sheet for a transmission type projection screen formed of a transparent material containing no light diffusing fine particles. Is to provide a light diffusion layer only in a portion where light is transmitted. As means for providing a light diffusion layer only in a portion where a projected image is transmitted,
Infrared absorbing agent and foaming agent are coated on the black stripe layer, and infrared rays are radiated vertically from the cylindrical lens side. Using the light condensing of the cylindrical lens, only the non-light-shielded part is foamed by two kinds of material reactions. I do. The foamed portion has a light diffusion effect, and the black stripe portion, which is a light shielding portion, is transparent without foaming, so that a light diffusion layer for a transmission type projection screen with high contrast and no hot spot can be obtained.

That is, according to the first aspect of the present invention, there is provided a lenticular sheet in which a cylindrical lens is provided on one side and a black stripe layer is formed on a flat surface side of a lenticular sheet having a flat surface on a portion through which projection light from a projection is not transmitted. A light-transmitting projection screen characterized in that a light-diffusing layer portion formed by foaming is provided only in a light-transmitting portion.

[0010] The invention according to claim 2 is: (a) a step of forming an ionizing radiation curable resin layer on a flat surface of a lenticular sheet having a cylindrical lens on one side and a flat surface on the other side. (B) While relatively moving the light source for curing the ionizing radiation-curable resin and the lenticular sheet in the direction in which the cylindrical lenses are juxtaposed, the belt-shaped light beam extending in the longitudinal direction of the cylindrical lenses is irradiated with the lenticular sheet from the cylindrical lens side. A step of irradiating the ionizing radiation-curable resin layer in the uncured state at the portion condensed by each of the cylindrical lenses by irradiating the resin layer perpendicularly to the flat surface. (C) A step of superimposing the black transfer foil on the ionizing radiation-curable resin layer, coloring portions other than the cured portions black, and forming a black stripe pattern on a flat surface. (D) a step of coating a coating liquid obtained by kneading an infrared absorbent and a foaming agent on the black stripe pattern surface of the ionizing radiation-curable resin layer; (E) a step of irradiating infrared rays perpendicularly to the flat surface of the lenticular sheet from the cylindrical lens side to foam a portion where the infrared rays are condensed by each of the cylindrical lenses to form a light diffusion layer portion. The method of manufacturing a transmission projection screen according to claim 1, wherein the method is manufactured by the above procedure.

The invention according to claim 3 is: (a) a step of forming an ionizing radiation-curable resin layer on a flat surface of a lenticular sheet having a cylindrical lens on one side and a flat surface on the other side. (B) While relatively moving the light source for curing the ionizing radiation-curable resin and the lenticular sheet in the direction in which the cylindrical lenses are juxtaposed, the belt-shaped light beam extending in the longitudinal direction of the cylindrical lenses is irradiated with the lenticular sheet from the cylindrical lens side. A step of vertically irradiating the flat surface to cure the uncured ionizing radiation-curable resin layer in the portion condensed by each of the cylindrical lenses. (C) A step of superimposing the black transfer foil on the ionizing radiation-curable resin layer, coloring portions other than the cured portions black, and forming a black stripe pattern on a flat surface. (D) a step of laminating a film in which a coating liquid obtained by previously kneading a transparent film substrate with an infrared absorbent and a foaming agent is kneaded into a black stripe pattern. (E) a step of irradiating infrared rays perpendicularly to the flat surface of the lenticular sheet from the cylindrical lens side to foam a portion where the infrared rays are condensed by each of the cylindrical lenses to form a light diffusion layer portion. The method of manufacturing a transmission projection screen according to claim 1, wherein the method is manufactured by the above procedure.

According to a third aspect of the present invention, in the second aspect, instead of directly coating the coating solution containing a foaming agent on the black stripe layer, a coating solution containing a foaming agent in advance on a transparent film substrate is provided. Is prepared, and this film is laminated on a black stripe pattern, and then irradiated with infrared rays. This film becomes a protective film for protecting the light diffusion layer.

According to a fourth aspect of the present invention, the foaming agent of the third or fourth aspect is a gas-encapsulated vinylidene chloride foaming filler, azodicarbonamide, or a mixture thereof. 2. The method according to claim 1, wherein
Is a transmission type projection screen.

According to a fifth aspect of the present invention, there is provided the transmission type projection screen according to the first aspect, wherein the infrared absorbent according to the second or third aspect is a polymethine compound. is there.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a structural sectional view of a transmission type projection screen according to the present invention. FIG.
(A) shows a black stripe (14) on a flat portion side of a lenticular sheet (10) that is not condensed by a cylindrical lens, that is, a light-shielded portion, and a coating agent containing a foaming agent on the black stripe (14) layer. After coating, infrared rays are irradiated vertically, and only the portions where the infrared rays are condensed by the cylindrical lenses react with the thermal reaction of the infrared absorbent to foam and form a light diffusion layer (16a) on the black stripe (14) layer. 1 is a cross-sectional view illustrating a configuration of a transmission type projection screen having a configuration in which is formed. FIG. 1B is a cross-sectional view of the configuration of the transmission type projection screen according to the third aspect, in which a transparent film (18) serving as a protective layer is laminated on a light diffusion layer (16a) formed by foaming. Things.

FIG. 3 shows a transmission type projection screen according to the present invention using an ultraviolet (UV) light source and an infrared (IR) light source.
It is a schematic process drawing explaining the manufacturing process using a light source.
The lenticular sheet (10) may be formed by molding a transparent thermoplastic resin such as acrylic, vinyl chloride, carbonate, or the like by an arbitrary method, or may be made of ultraviolet (U)
V) A cured product of the above-mentioned resin using an ionizing radiation-curable resin such as a curable resin or an electron beam (EB) curable resin. Further, only a cylindrical lens of a lenticular sheet is formed from a cured product of an ionizing radiation-curable resin. In this case, a cylindrical lens may be formed on the surface of a transparent resin substrate.

<First Step> A step of forming an ionizing radiation-curable resin layer on a flat surface of a lenticular sheet having cylindrical surfaces arranged on one side and a flat surface on the other side (FIG. 3B). <Second step> While relatively moving the light source for curing the ionizing radiation-curable resin and the lenticular sheet in the direction in which the cylindrical lenses are juxtaposed, the belt-shaped light beam extending in the longitudinal direction of the cylindrical lenses is lenticularly irradiated from the cylindrical lens side. A step of vertically irradiating the flat surface of the sheet to cure the uncured ionizing radiation-curable resin layer in the portion condensed by each cylindrical lens (FIG. 3C). The condensed resin of the cured portion (12a) loses its adhesiveness, and when the black transfer foil (13) is overlaid in the next step, the black layer is not transferred to this portion. <Third step> The black transfer foil (13) is superimposed on the ionizing radiation-curable resin layer, and the uncured portion other than the cured portion (12b)
A step of coloring the portion black and forming a black stripe pattern on a flat surface (FIGS. 3D to 3E). <Fourth step> In advance, a transparent film substrate is provided with an infrared absorbent,
A film (15) coated with a coating solution obtained by kneading a foaming agent is laminated on a black stripe pattern, and infrared rays are irradiated perpendicularly to the flat surface of the lenticular sheet from the cylindrical lens side. Forming a diffusion layer portion by foaming a portion where light is condensed (FIG. 3F). Through the above steps, the transmission type projection screen shown in FIG. 1B is manufactured.

[0018]

Embodiments of the present invention will be described below. The present invention is not limited to the materials and shapes used below. <Lenticular sheet> A lenticular sheet is obtained by forming a cylindrical lens group made of a cured product of a UV-curable resin on a transparent polycarbonate substrate having a thickness of 1.0 mm. Pitch 0.4 mm, spherical radius 0.35 mm, lens thickness 0.
063mm, size 120cm × 90cm

<U for forming a black stripe
V-curable resin> A chromin film manufactured by Dubon Co., Ltd., which has a function of eliminating tackiness in a portion cured by UV irradiation, is laminated on a flat surface of a lenticular sheet.

<Formation of Black Stripe> After irradiating UV light from the cylindrical lens side and photo-curing only the part where the UV light is condensed, a black coating of the following formulation is applied to one surface of the base material polyethylene terephthalate. Using a black transfer foil (13) having a film thickness of 1.5 μm and being transferred onto the above-mentioned cromarin, the uncured portion (12
A black stripe (14) layer is formed only in b).

<Composition of Black Coating Agent> Acrylic resin (BR80 manufactured by Mitsubishi Rayon Co., Ltd.) 30 parts by weight Carbon black 5 parts by weight Curing reaction inhibitor (2,2,4-trimethyl-1,2-dihydroquinone) 1 part by weight Parts Solvent (MEK / toluene = 1/1) 64 parts by weight

<Example> The above lenticular sheet having a black stripe layer formed on a flat surface was coated with a coating solution containing a foaming agent having the following formulation and had a thickness of 25 μm.
m polyethylene terephthalate (PET) film (1
5) is laminated on the black stripe (14) layer. Thereafter, the PET film (15) is laminated on a black stripe layer, and infrared rays are irradiated from the side of the cylindrical lens, and only a portion where the infrared light is focused has a light diffusion layer (16a) foamed. A screen was made.

<Composition of a coating solution containing a foaming agent> Acrylic resin (BR80, manufactured by Mitsubishi Rayon Co., Ltd.) 30 parts by weight Blowing agent (IR-820B, manufactured by Nippon Kayaku Co., Ltd.) 15 parts by weight Infrared absorbent (Matsumoto Yushi) 5 parts by weight Solvent (MEK / toluene = 1/1) 50 parts by weight

As a comparative example, a transmission type projection screen was prepared by laminating a diffusion film coated with a coating solution containing fine particles on a black stripe layer. <Comparative Example> A polyethylene terephthalate (PET) film base material having a thickness of 25 μm and having both surfaces subjected to an easy adhesion treatment,
A light-diffusing ink having the following composition is applied and dried, and then, on a surface different from the light-diffusing layer, a B-manufactured by Toyo Ink Manufacturing Co., Ltd.
PS233D adhesive is applied and dried to give an adhesive layer,
It was laminated on a lenticular sheet to produce a transmission type projection screen.

<Composition of Light Diffusion Ink> Polyester resin (Toyobo Co., Ltd. Byron 200) 30 parts by weight Silicone resin particles (Toshiba Silicone Co., Ltd. Toshipearl 120) 4 parts by weight Polystyrene beads (Sekisui Plastics Co., Ltd.) SBX-6) 5 parts by weight Methylethylene 30 parts by weight Toluene 31 parts by weight

The transmission projection screens produced in the above Examples and Comparative Examples were projected and observed by a projector as shown in FIG.

In the comparative example of the prior art, since the light diffusion layer was laminated on the entire surface of the black stripe layer, the black was blurred by light diffusion and the contrast was lowered. Since a light diffusion layer is provided, black can be raised to allow observation of a high-contrast image, and a transmission type projection screen having an excellent appearance can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a transmission type projection screen of the present invention, in which (A) has a light diffusion layer as an outermost layer, and (B) has a structure having a protective layer on the light diffusion layer. belongs to.

FIG. 2 is a configuration diagram showing a use form of a transmission type projection screen.

FIG. 3 is an explanatory view showing steps of manufacturing a transmission type projection screen according to the present invention in the order of steps.

FIG. 4 is a cross-sectional view of a transmission type projection screen of a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Lenticular sheet 12 ... Ionizing radiation curable resin 12a ... Cured part 12b ... Uncured part 13 ... Black transfer foil 14 ... Black stripe 15 ... Film coated with coating liquid containing foaming agent 16a ... Light diffusion layer by foaming 16b … Light diffusion layer made of light diffusing fine particles 18 Protective film 20 Fresnel lens 30 Projector 40 Viewer

Claims (5)

[Claims] 1. A cylindrical lens is arranged on one side,
On the flat surface side of the lenticular sheet whose other surface is a flat surface, a black stripe layer portion is provided in a portion where the projection light from the projection does not transmit, and a light diffusion layer portion due to foaming is provided only in the transmitting portion. Transmissive projection screen. (A) a step of forming an ionizing radiation-curable resin layer on a flat surface of a lenticular sheet having a cylindrical lens on one side and a flat surface on the other side. (B) While relatively moving the light source for curing the ionizing radiation-curable resin and the lenticular sheet in the direction in which the cylindrical lenses are juxtaposed, the belt-shaped light beam extending in the longitudinal direction of the cylindrical lenses is irradiated with the lenticular sheet from the cylindrical lens side. A step of irradiating the ionizing radiation-curable resin layer in the uncured state at the portion condensed by each of the cylindrical lenses by irradiating the resin layer perpendicularly to the flat surface. (C) a step of superposing the black transfer foil on the ionizing radiation-curable resin layer, coloring portions other than the cured portions black, and forming a black stripe pattern on a flat surface. (D) a step of coating a coating liquid obtained by kneading an infrared absorber and a foaming agent on the black stripe pattern surface of the ionizing radiation-curable resin layer. (E) A step of irradiating infrared rays perpendicularly to the flat surface of the lenticular sheet from the cylindrical lens side to foam a portion where the infrared rays are condensed by each of the cylindrical lenses to form a light diffusion layer portion. The method for manufacturing a transmission projection screen according to claim 1, wherein the transmission projection screen is manufactured by the above steps. 3. A step of forming an ionizing radiation curable resin layer on a flat surface of a lenticular sheet having a cylindrical lens on one side and a flat surface on the other side. (B) While relatively moving the light source for curing the ionizing radiation-curable resin and the lenticular sheet in the direction in which the cylindrical lenses are juxtaposed, the belt-shaped light beam extending in the longitudinal direction of the cylindrical lenses is irradiated with the lenticular sheet from the cylindrical lens side. A step of irradiating the ionizing radiation-curable resin layer in the uncured state at the portion condensed by each of the cylindrical lenses by irradiating the resin layer perpendicularly to the flat surface. (C) a step of superposing the black transfer foil on the ionizing radiation-curable resin layer, coloring portions other than the cured portions black, and forming a black stripe pattern on a flat surface. (D) a step of laminating a film in which a coating liquid obtained by kneading a transparent film substrate with an infrared absorbing agent and a foaming agent in advance is kneaded on a black stripe pattern. (E) A step of irradiating infrared rays perpendicularly to the flat surface of the lenticular sheet from the cylindrical lens side to foam a portion where the infrared rays are condensed by each of the cylindrical lenses to form a light diffusion layer portion. The method for manufacturing a transmission projection screen according to claim 1, wherein the transmission projection screen is manufactured by the above steps. 4. The foaming agent according to claim 2, wherein the foaming agent is a vinylidene chloride foaming filler containing gas, azodicarbonamide, or a mixture thereof. The transmission projection screen according to the above. 5. The infrared absorbent according to claim 2, wherein the infrared absorbent is a polymethine compound.
2. The transmission projection screen according to 1.