JPH10260476A - Reflection type projection screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent noise from coming from the front surface and the back surface of a screen and to enhance screen gain in a light room by laminating a light shielding and reflecting layer including at least white pigment, a light reflecting layer formed by distributing scaly thin pieces in transparent resin and a light diffusing layer formed by including calcite microcrystal perticulates and achromatic dye or achromatic pigment in light transmitting resin in turn. SOLUTION: A base material sheet 1, the light shielding and reflecting layer 2 formed by distributing the white pigment 21 and the scaly thin pieces 31 in the transparent resin 22, the light reflecting layer 3 formed by distributing the scaly thin pieces 31 in the transparent resin 32 and the light diffusing layer 4 formed by distributing the calcite microcrystal perticulates 41 in the light transmitting resin 42 including an achromatic material 43 by the dye or the pigment are laminated. By forming the layer 2 between the layer 3 and the sheet 1 in such a way, projection light 7 is prevented from being transmitted through the layer 3 and the noise light 80 is prevented from coming from the back surface of the screen. Thus, a visual field angle and contrast are maintained and the screen gain is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type television and a projection screen, and more particularly to a reflection type projection screen for projecting an image from a projection device.

[0002]

2. Description of the Related Art A reflection type projection screen is known to be used as a light reflection surface of a projection screen by coating a projection surface of the screen with a paint in which aluminum powder is dispersed in a binder. It is also known that mica scale-like flakes or the surface thereof is coated with a coating containing titanium dioxide, which is a so-called brilliant pigment, and is used as a light diffusion surface or a light reflection surface of a projection screen.

[0003] A reflection type projection screen in which a light diffusion layer in which microcrystalline particles of calcite acting as a light diffusing agent having low light absorption property are dispersed in a light transmitting resin is laminated on a light reflecting layer is used. It is also known to spread the word.

[0004] However, the reflection layer in which the aluminum powder is dispersed tends to be close to specular reflection when the brightness of the reflected light is increased, and the viewing angle is narrowed. Conversely, when the viewing angle is widened, the contrast of the reflected light is reduced. There was a limit on the amount of used. When a brilliant pigment is used for the light reflection layer, there is a problem that the brightness required by the projection screen is insufficient, and that the light transmitted from the base sheet (back side of the screen) of the screen acts as noise. . Further, a metal (aluminum) having excellent reflection may be subject to chemical changes such as oxidation. If the screen is used for a long time or the storage condition causes the metal to oxidize and lose its reflectivity, the projected light will pass through the screen without being reflected, and conversely, the light reflecting layer will shine from the back in a pin-hole shape. However, there is a problem that the light is transmitted to generate noise. Metals such as silver, chromium, nickel, and copper, which are chemically stable, are difficult to process into flakes like aluminum, and because of their high density, there is no pinhole on the screen surface and the coating amount must be uniform. In many cases, their uses were very limited.

However, in recent years, a high-quality one maintaining a viewing angle and improving contrast between brightness and brightness of an image has been demanded. Even in a screen provided with a light reflection layer coated as described above, when the screen is used in a bright room, there is a problem that noise light passes through the back surface of the screen and lowers the brightness of the screen.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a conventional reflection type projection screen using a light reflection layer coated so as to be parallel to a plane of incidence and fine crystal grains of calcite. By preventing the projected light from passing through the screen and preventing noise light emerging from the back of the screen, without reducing the viewing angle or contrast in a bright room,
It is an object of the present invention to provide a reflective projection screen with improved screen brightness.

[0007]

The reflection type projection screen of the present invention comprises a "light hiding / reflection layer" containing at least a white pigment (hereinafter referred to as a "light hiding / reflection layer") and a flaky transparent resin. This is a reflection type projection screen in which a “light reflection layer” in which flakes are dispersed and a “light diffusion layer” in which light-transmitting resin contains calcite microcrystal particles and an achromatic dye or pigment are sequentially laminated.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The reflection type projection screen 10 of the present invention.
Is, as shown in FIGS. 1 and 4, a "base sheet 1",
"Light concealing / reflective layer 2" in which white pigment 21 and flaky flake 41 are dispersed and formed in transparent resin 22, "Light reflecting layer 3" in which flaky flake 31 is dispersed in transparent resin 32, and dye or pigment The reflection type projection screen 10 is obtained by sequentially laminating a “light diffusion layer 4” in which calcite microcrystalline particles 41 are dispersed in a light transmitting resin 42 containing an achromatic colorant 43.

In the reflection type projection screen 10 of the present invention, by providing the light concealing / reflection layer 2 between the light reflection layer 3 and the base sheet 1 shown in FIG. 1 and FIG. This is to prevent the noise light 80 passing through the reflective layer 3 or, conversely, from the back surface of the screen, thereby preventing the screen gain from lowering.

The conventional reflection type projection screen has a configuration in which the light concealing / reflection layer 2 is removed from FIG. The light-reflecting layer 3 is provided so that the flakes are parallel to each other, and the light-diffusing layer 4 is formed on the surface of the light-reflecting layer 3 by dispersing calcite microcrystalline particles 41 in a light-transmitting resin 42. The normal operation is that the projection light 7 is reflected by the scale-like flakes 31 of the light reflection layer 3 and further diffused by the calcite microcrystal particles 41 of the light diffusion layer 4 to become output light 71. The principle is that the noise light 8 is repeatedly diffused and attenuated by the calcite microcrystal particles 41 of the light diffusion layer 4.

However, it is extremely difficult for the flaky flakes of the light reflection layer 3 to completely hide the base sheet, and the flakes may become translucent due to a chemical change with time. . The projection light 7 does not completely pass through the light reflecting layer 3 having a light transmitting property and completely shield the back surface of the base sheet, and noise light 80 from the back surface passes through the light reflecting layer 3 and passes through the light diffusing layer. The output noise light 81 diffused in step 4 disturbs the projected image and causes a reduction in screen gain.

The light concealing / reflecting layer of the present invention has a function of inhibiting the generation of the output noise light 81, and is constituted by a layer to which flaky flakes and a white pigment having a large concealing property are added. It is. The white concealing layer is formed by various methods as described later, and blocks or attenuates the output of the noise light 8 passing through the light reflecting layer shown in FIG. 4 or the noise light 80 from the back surface of the screen. It appears as extremely weak noise light on the surface of the projection screen, and prevents a decrease in screen gain especially in a bright room.

The light hiding / reflecting layer of the present invention comprises at least a white layer contained in a base sheet, a base sheet laminated, or a coating formed on the surface of a base sheet. It is preferable to use an ordinary white pigment for the white color having hiding properties, and inorganic pigments such as barium sulfate, calcium carbonate, zinc oxide, titanium dioxide, and diantimony trioxide are used. Among them, titanium dioxide having a large refractive index and excellent concealing property is preferable, and by adding 0.5 to 20% of aluminum powder or a brilliant pigment to these, the concealing power is further increased, and the object of the present invention is It can be suitable for

The light hiding / reflection layer is formed by applying a coating liquid containing the above-mentioned white pigment to a base sheet, kneading the base sheet at the time of forming the base sheet to form a white sheet, 2
In the case of a laminate having more than two layers, the adhesive may contain a white pigment. When the base sheet has two or more layers, the white sheet can be used as the white sheet on the side in contact with the light reflecting layer, and the two-color sheet can be white and black with the back side being black.

The base sheet of the present invention comprises polyethylene, ethylene-vinyl acetate copolymer (EVA), ionomer, ethylene-ethyl acrylate copolymer (EEA),
Polyethylene resins such as ethylene-acrylic acid copolymer (EAA), methylpentene polymer and polybutene; polyesters such as polyethylene terephthalate and polybutylene terephthalate; polyvinyl chloride (hard,
(Semi-hard or soft), polyamide such as nylon 6, nylon 66, cellulose di- or triacetate, polystyrene, acrylonitrile-styrene-butadiene copolymer, saponified ethylene-vinyl acetate copolymer, polyarylate, polycarbonate, noryl (GE (Registered trademark), polyethersulfone, polymethyl methacrylate or the like, a stretched or non-stretched sheet, a synthetic paper produced from a low-foamed plastic sheet, a woven or nonwoven fabric using glass or resin fibers, and the like. These are used as a single layer or as a laminate of two or more different layers.

The reflection type projection screen is made of a glass fiber woven or non-woven fabric and a soft or semi-rigid from the viewpoint of achieving both flame retardancy, rigidity and flexibility and preventing traces such as breakage and bending. A laminate with a polyvinyl chloride sheet is preferred.
Furthermore, in order for the base sheet to have a surface smoothness and to further stabilize the performance of the light reflection layer and the light diffusion layer by coating,
It is preferable to use a laminate of a biaxially stretched polyethylene terephthalate sheet and a soft or semi-rigid polyvinyl chloride sheet or polybutylene terephthalate film.
As the base sheet used for the structure, two or more layers of the above-mentioned resin sheet and a different kind of sheet such as a metal plate or wood are laminated. As the plate-like base sheet, a curved plate curved in a concave or convex shape can be used in addition to a flat plate. The fixed type projection screen is not particularly limited in thickness as long as it has a strength as a structure.

When the reflection type projection screen is used in the form of a roll, the film can be wound in a cylindrical shape having a minimum diameter of 30 mm, and the tension at the time of winding / unwinding can be up to 20K.
g / m width of tension, the most important factors are sagging, curling,
There is no deformation such as wrinkles, on this surface, a light reflection layer, a light diffusion layer etc., the outermost surface has a smoothness such that unnecessary irregularities such as texture, formation unevenness do not appear, and further laminated other materials, It is necessary that heat and tension in the processing step of coating do not hinder. In the case of the winding type, it is preferable to use a substrate sheet having a thickness of 50 to 500 μm from the viewpoint of strength and flexibility. Dimensionally stable base sheets with these characteristics are required for single-layer plastic sheets or laminated sheets, and these sheets are combined with the optical characteristics of the projection screen, such as light absorption, whiteness, and reflectivity. It is desirable to have.

The light reflecting layer is formed by applying a paint in which flaky flakes of a light reflecting substance are dispersed using a transparent resin as a binder. The flakes contained in the coating film are preferably arranged so as to be parallel to the surface of the screen, whereby good screen gain and viewing angle can be obtained. In order to orient the flake-like flakes so that the flat surface of the flake-like flakes constituting the light reflecting layer is substantially parallel to the projection light incident surface and the image observation surface, a roll coating method or a comma coating method is used. When the coating is performed by a gravure coating method or the like, it is preferable that the coating be applied so that a shear stress acts in a direction parallel to the traveling direction of the sheet. Further, the thickness of the coating is set to be equal to or less than the width of the flat plate surface of the flake-shaped flake, and the coating is performed so as to be oriented at the time of coating.

When the light reflecting layer is composed of a sheet, the flat surface of the scale-like flakes is applied to the projection light incidence and the image observation surface by stretching the sheet in which the flake-like flakes are dispersed and formed into a transparent resin to form a film. It can be oriented so as to be substantially horizontal to it.

The glitter pigments constituting the light-reflective substance are as follows. A pearl pigment manufactured by baking titanium oxide or iron oxide on the inside of shells or crushed pearls, mica, or scaly fine particles having an average particle size of mica of 10 to 30 μm. Copper, aminium, brass, bronze, gold, silver, etc.
Metal powder processed into 30 μm flat fine particles. Fragments of a polyethylene terephthalate film having a thickness of 4 to 8 μm on which a metal described above, usually aluminum is deposited. Among these light-reflective materials, in order to improve the screen gain, aluminum foil pieces or crushed pieces of a metal (aluminum) vapor-deposited film are preferable, and the flat surface of the scale-like flakes and the reflection surface of the substrate sheet are parallel. , The light reflectance can be significantly improved. Further, these glittering pigments and white pigments can be mixed and used for the light hiding / reflecting layer.

The average particle size of the flaky flakes is 5 to 30 in order to achieve both high light reflectivity and high screen gain.
μm, more preferably 10 μm
〜20 μm.

The transparent resin (binder) of the light reflecting layer may be one or more of acrylic resin, polyester, polycarbonate, vinyl chloride / vinyl acetate copolymer, polyurethane, etc., and a leveling agent, a plasticizer, a surfactant. It is prepared by appropriately adding an agent and the like. And it is preferable that the scale-like flake added to a binder is 5 to 40%.

The thickness of the light reflecting layer must cover the entire surface of the base sheet with the brilliant pigment, and is preferably 1 to 10 μm from the viewpoint of high light reflectivity and economy. The formation is performed by a coating method such as a roll coating method, a gravure coating method, or a comma coating method. In addition, a coating liquid made of a material lacking in affinity with a binder, such as a brilliant pigment, is likely to cause unevenness during coating,
By performing overprinting several times, the entire surface can be covered with a small amount of material used, and light reflection can be more effectively performed. Therefore, it is preferable to perform the coating twice to cover the entire surface. In addition, a sheet containing a light-reflecting substance or a metal-deposited film formed in advance by a usual extrusion method or casting method can be laminated.

As shown in FIG. 1, the light diffusing layer 4 of the present invention is formed by applying and forming a layer having an uneven shape on the light reflecting layer 3 as required. Then, as shown in FIG. 4, the light reflected once by the light reflection layer 2 is transmitted, the noise light 6 coming from the side is absorbed, and a part of the light is further diffused to reduce glare on the screen. In principle, it has the function of appropriately expanding the viewing surface. The microcrystalline particles to be added to the light diffusion layer 4 generally include silica particles, mica scales, mica scales coated with titanium dioxide, microcrystalline particles of calcite, synthetic resin beads such as acrylic resin and polycarbonate. Particularly preferred are calcite microcrystal grains, which widen the viewing angle and exhibit sufficient contrast.

The binder (light-transmitting resin) of the light-diffusing layer coating solution containing 2-30% of calcite microcrystal particles is polyester, acrylic resin, vinyl chloride / vinyl acetate copolymer or polyester. One or a mixture of two or more of a two-pack reaction type resin using a polyisocyanate as a curing agent in a polyol, a polyurethane polyol or the like, and an ionizing radiation-curable resin having thermoplasticity in an uncured state. Fine particles such as microsilica and organic bentonite are used in an amount of 3 to 10 parts by weight per 100 parts by weight of the binder resin for the purpose of assisting the uniform dispersion of the calcite microcrystal particles and improving the coating suitability (fluidity with thixotropic properties). Add parts by weight. In addition, if necessary, the light diffusion layer 4 is prepared by adding additives such as an antistatic agent, a heat stabilizer, and an ultraviolet absorber, in addition to a lubricant such as silicone and wax, to prepare a “light diffusion layer coating liquid”. I do.

The light diffusion layer 4 of the present invention can be provided directly on the light reflection layer 3. The coating is carried out by a usual roll coating method, a gravure coating method, a comma coating method, a bar coating method or the like according to the properties of the coating liquid and the amount of coating. An uneven shape is formed by a cooling roll, a shaping sheet or a shaping roll in the drying step. These shaping can be performed by any method in the same step as the coating or in a separate step.

The light diffusion layer is also a surface on which projection light is incident and an image is observed. The shape of the surface on which the projection light is incident and the image is observed is formed into an uneven shape such as a grain, a matte surface, a lenticular lens, a Fresnel lens, etc.
It adjusts the orientation characteristics such as viewing angle and contrast.

The achromatic colorant used in the light diffusion layer of the present invention is
It has the function of absorbing light while transmitting light.
The achromatic dye or pigment is dispersed in a transparent resin to improve image contrast.
As the dye or pigment of the achromatic colorant, carbon pigments such as carbon black and graphite, black pigments such as aniline black and cyanine black, and white pigments such as titanium oxide and zinc white can be used. Further, the color may be adjusted to an achromatic color (white to gray to black) by mixing three primary color components such as phthalocyanine blue, quinacridone red, and isoindolinone (yellow) having excellent light resistance.
Further, by dispersing and containing fine calcite powder, the contrast can be improved and the light diffusion effect can be further enhanced.

The achromatic color is a color that can be represented by only the lightness attribute among the three color attributes. In the present invention, the range of the Y value based on the standard light C defined in JIS Z8720 is 0. Desirably, it is 60. However,
In the present invention, the color is not necessarily strictly achromatic, and may have a hue and saturation that do not affect the image projected by the projection light.

In the present invention, the light reflecting layer or the light diffusing layer formed by coating is formed on a primer layer based on a general method in order to more firmly and stabilize the adhesion to the respective surfaces to be coated. Can also be provided. The primer layer is a two-component reaction using a conventionally used polyester, acrylic resin, vinyl chloride / vinyl acetate copolymer, epoxy, polyester polyol, polyurethane polyol, etc. with a polyisocyanate as a curing agent. A mold varnish is applied and formed to a thickness of 0.1 to 3 μm.

As described above, the reflection type projection screen 10 of the present invention has the light concealing / reflection layer 2
And a light diffusion layer 4 in which the light reflection layer 3 and the achromatic colorant 43 and the calcite microcrystal particles 41 are dispersed in the light transmission resin 42. The light hiding / reflection layer 2
While the incident light is reflected by the flaky flakes, the white pigment 21 of the light concealing layer conceals light that cannot be covered by the flaky flakes 31 and improves the screen gain. The light concealing / reflection layer 2 in which the flaky flake 31 and the white pigment 21 are dispersed in the transparent resin 22 has both high reflectance and concealing property. In addition, the calcite microcrystal particles 41 included in the light diffusion layer 4 have no light absorption and have appropriate light diffusion characteristics. Therefore, the calcite microcrystal particles 41 are
The light diffusion layer 4 dispersed in 2 has a high light transmittance. Therefore, the reflection type projection screen 10 of the present invention has a synergistic effect with the light hiding / reflection layer, the light reflection layer and the light diffusion layer.
Extremely wide viewing angle and high reflection brightness (screen gain)
It has.

The calcite microcrystal particles 41 in the light diffusion layer 4
Is present such that the flat surface of the fine particles is not parallel to the incident projection light surface and the image observation surface, and the flat surface of the flaky flake 31 of the light reflection layer 3 is positioned at the incident projection light surface and the image. It is made to be substantially parallel to the observation surface. In this way, when the angle formed by the incident projection light and the normal 9 of the image observation surface is small, most of the projection light 7 is calcite microcrystalline particles 41 (particularly, the flat surface is the image observation surface). And those which are oriented at an angle that is perpendicular to or close to the perpendicular, are diffused and transmitted through the flat plate surface with almost no attenuation. Then, the light is reflected by the light reflection layer 3 with a high reflectance, is again appropriately diffused by the light diffusion layer 4, and forms an image as output light 71 from the light diffusion layer.

On the other hand, the noise light 8 (external light) having a large angle formed by the incident projection light and the normal 9 enters the light diffusion layer 4 and is reflected in a direction almost parallel to the image observation surface. Also,
Multiple reflections between the calcite microcrystal particles 41 further attenuate
It disappears or is concealed by the achromatic material 43. Therefore, the noise light 8 seen from the projection surface side and the noise light 80 passing through the base sheet 1 seen in the light place are also reduced by the light concealment / reflection layer 2 containing the white pigment 21 and almost reflected to the outside. Not done. Further, the temporarily output noise is of such a degree that the noise is not discriminated, and an image with high luminance and high contrast can be obtained even in a bright place.

[0034]

Hereinafter, the present invention will be described in more detail with reference to examples. Example 1 As shown in FIG. 4, a flexible polyvinyl chloride sheet (sheet material B) 16 having a thickness of 300 μm containing 48 parts by weight of dioctyl adipate, and a biaxially stretched polyethylene terephthalate sheet (sheet material A) having a thickness of 125 μm
The base sheet 1 of Example 1 was formed by laminating 17 with a normal dry lamination in which an adhesive layer 15 was provided using a polyester-isocyanate-based adhesive.

On the other hand, a polyurethane varnish (transparent resin 2)
2) 1% by weight of flaky aluminum foil pieces (light-reflective substance 41) and 30% by weight of titanium oxide (white pigment 21)
(Coating liquid for light hiding / reflection layer) containing (solid content ratio, hereinafter the same). Then, the coating liquid was applied to the surface of the soft polyvinyl chloride sheet (sheet material B) 16 of the base sheet 1 by a gravure coating method so as to have a thickness of 10 μm to form the light concealment / reflection layer 2. . Further, a “reflection layer coating liquid” containing 20% by weight of flaky aluminum foil pieces (light-reflective substance 31) in a polyurethane-based varnish (transparent resin 32) was prepared. The gravure coating method was applied in two steps of 5 μm each so that the flat surface of the scale-like aluminum foil piece 31 was substantially parallel to the projection incident surface and the image observation surface (base sheet). The light reflecting layer 3 having a thickness of 10 μm was provided.

Then, a “light diffusion layer coating solution” having the following composition was applied to the surface of the light reflection layer 3 to a thickness of 5 μm to form a light diffusion layer 4. [Composition of light diffusion layer coating liquid]-Calcite microcrystal particles 20 parts by weight-Polyester resin 80 parts by weight-Carbon black 1 part by weight-Antistatic agent 5 parts by weight-Toluene 130 parts by weight-Methyl ethyl ketone 100 parts by weight

The light diffusion layer 4 is shaped by a cooling roll having an uneven shape in a heating and drying step, and the light diffusion layer 4 having a matte uneven shape is formed on the cooled and solidified surface. The reflection type projection screen 10 of Example 1 was produced.

[0038]

Example 2 As shown in FIG. 2, a light-reflective layer 3 and a light-diffusing layer were formed on a white polyvinyl chloride sheet (light concealing substrate sheet 12) containing 10% by weight of titanium oxide in the same manner as in Example 1. 4 was provided to produce a reflective projection screen 10 of Example 2 of the present invention.

[0039]

EXAMPLE 3 As shown in FIG. 3, titanium oxide was added to a polyester-isocyanate-based adhesive for laminating a transparent sheet material A (16) and a sheet material B (17).
% By weight and laminated by ordinary dry lamination to form a base sheet 1 of Example 3 having a white adhesive layer 6. Further, a light reflection layer 3 and a light diffusion layer 4 are provided in the same manner as in the second embodiment, and
0 was produced.

(Comparative Example) The light-reflecting layer 3 and the light-diffusing layer 4 used in Example 1 were directly formed on the sheet material B of the base sheet 1 manufactured in Example 1 by the same method, and the light concealment of Comparative Example was performed. A reflection type projection screen 10 having no function was constructed.

Table 1 shows the screen gain (reflection luminance), viewing angle and contrast of the reflection type projection screens constructed in Examples and Comparative Examples, which were evaluated by the following methods.

Screen gain: A whole white image is projected from the projector onto the projection surface of the reflection type projection screen, and the luminance (cd / m ² ) and illuminance (1x) at the center of the projection surface are measured. Calculate the screen gain.

[0043]

## EQU1 ## Screen gain = π × (luminance / illuminance)...

Viewing angle: A white image is projected on the entire surface in the same manner as in the measurement of the screen gain, and the luminance meter is set in a horizontal direction within an angle range of -60 ° to + 60 ° with respect to a normal line from the center of the screen. Next, the angle dependence (orientation characteristics) of the luminance is measured. Then, an angle range having half or more of the luminance in the normal direction, that is, a half-value angle is defined as a viewing angle.

Contrast: Two types of images, black and white, were projected from the projector and the contrast was calculated by calculating A in equation (2).

[0046]

## EQU2 ## (Screen luminance at the time of black signal) / (Screen luminance at the time of white signal) = 1 / A...

[0047]

[Table 1]

[0048]

According to the present invention, a viewing angle and a contrast can be maintained by forming a light concealing / reflection layer, a light reflection layer and a light diffusion layer containing at least a white pigment on the surface of the base sheet or the base sheet of the present invention. This has the effect of improving the screen gain.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a configuration of a reflection type projection screen of the present invention.

FIG. 2 is a schematic sectional view showing another configuration of the reflection type projection screen of the present invention.

FIG. 3 is a schematic sectional view showing another configuration of the reflection type projection screen of the present invention.

FIG. 4 is a schematic sectional view showing an embodiment of a reflection type projection screen of the present invention and a flow of light.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 base sheet 2 light hiding / reflection layer 3 light reflection layer 4 light diffusion layer 5 transparent base layer 6 white adhesive layer 7 projection light 8, 80 input noise light 9 normal 10 reflection type projection screen 15 adhesive layer 16 Sheet base material A 17 Sheet base material B 21 White pigment 22, 32, transparent resin 31 Scaly flake 41 Calcite microcrystal particles 42 Light transmissive resin 43 Achromatic color 71 Output light 81, 82 Output noise

Claims (1)

[Claims] 1. A light-shielding and light-reflecting layer containing at least a white pigment, a light-reflecting layer in which flaky flakes are dispersed in a transparent resin,
And a light diffusing layer comprising calcite microcrystalline particles and an achromatic dye or pigment sequentially laminated on a light transmitting resin.