JP3349593B2 - Projection screen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection type screen used as a screen of a projection television or a microfilm reader, and more particularly to a projection type screen having high resolution and mechanical strength and excellent image quality and appearance. And a projection screen.

[0002]

2. Description of the Related Art Projection screens include television images,
A Fresnel lens sheet that is widely used to project a microfilm image or the like and realize the intended display, and is generally arranged on the light source side and focuses incident light in the direction of the observer, and is arranged on the observation side And a lenticular lens sheet for diffusing light rays in the horizontal direction. Of these, the lenticular lens sheet is bright when viewed by an observer and has a light incident surface and / or a wide viewing angle so as to increase the viewing angle.
Alternatively, a lenticular lens having a predetermined shape is formed on the emission surface, and a light absorbing portion is formed between the lenticular lenses on the emission surface in order to enhance contrast.

[0003] In recent years, televisions such as clear vision and high vision have been actively developed to have high definition, and a projection screen has also been required to have a high resolution, so that a fine pitch of a lenticular lens is required. Is being requested. However, in the case of a lenticular lens sheet, as the pitch of the lenticular lens becomes finer, the distance between the lenses of the lenticular lens must be shortened, and the thickness of the lenticular lens sheet must be reduced. Had. Also, a light diffusing agent to be mixed into the lenticular lens sheet to impart vertical directivity,
There has been a problem that a diffusing agent in an amount capable of imparting sufficient diffusivity cannot be mixed, and diffusion in the vertical direction is insufficient, resulting in poor vertical directivity.

[0004]

Therefore, when such a thin lenticular lens sheet having a fine pitch is used as a projection screen, a light diffusing means is provided on the observation surface side of the lenticular lens sheet. There has been proposed a method in which an optical front plate is arranged, and a Fresnel lens sheet, a lenticular lens sheet, and a light-transmitting full-surface plate are fixed at a peripheral portion and integrated.

However, in the method of disposing a light-transmitting front plate on the observation surface side of the lenticular lens sheet and fixing and integrating the light-transmitting front plate at the periphery thereof, the mechanical strength and vertical directivity of the projection screen are improved. It is difficult to completely adhere the lenticular lens sheet and the light-transmitting front plate over the entire surface, and a distance occurs between the image forming surface of the lenticular lens sheet portion and the image forming surface of the light-transmitting front plate portion,
This causes the occurrence of multiple images and flares, resulting in a problem of lowering the image quality. In addition, since the lenticular lens sheet is thin, the lenticular lens sheet partially floats, which causes a problem such that a partial image distortion or the like deteriorates the image quality and the appearance of the screen is not preferable. Was. An object of the present invention is to provide a projection screen having high resolution and mechanical strength by making a lenticular lens finer and having excellent image quality and appearance.

[0006]

In view of such circumstances, the present inventors have made intensive studies on the configuration of the projection screen, and have reached the present invention. That is,
The projection screen of the present invention has a lenticular lens sheet having a lenticular lens with a pitch of 0.1 to 0.5 mm and a light absorbing portion formed on at least one surface, and the light absorbing portion is provided so as to protrude from the lens surface of the lenticular lens. And a light-transmitting front plate disposed on the observation surface side of the lenticular lens sheet, wherein the lenticular lens sheet and the light-transmitting front plate are bonded only at the light absorbing portions of the lenticular lens sheet. It is a feature.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The lenticular lens sheet constituting the projection screen of the present invention is not particularly limited, and may be formed by extrusion molding, cell casting, hot pressing or active energy ray-curable resin. Those obtained by a generally used manufacturing method such as a photopolymer method can be used. Among them, the pitch of the lenticular lens is 0.1 to 0.5 in order to respond to the high quality and high definition of the projection TV.
mm lenticular lens with fine pitch
It is suitable for over preparative, especially suited for double-sided lenticular lens sheet of fine pitch.

As such a fine-pitch double-sided lenticular lens sheet, a sheet-like transparent substrate having an active energy ray-curable resin layer formed on both sides thereof may be used.
Japanese Patent Application Laid-Open No. 3-200948 discloses a method obtained by arranging a contact between two lens molds on which a lenticular lens pattern is formed, and irradiating an active energy ray to cure and mold. like,
Adjacent orifices for forming adjacent strands are brought close to each other at a small interval, and the adjacent translucent strands are joined together by the phenomenon that the molten resin expands in the radial direction immediately after spinning out of the orifices (Bellus effect). Transparent strands may be arranged in parallel and integrated into a sheet. In such a double-sided lenticular lens sheet, a light absorbing portion is formed between the lenticular lenses on the exit surface to enhance contrast.

As an example, adjacent light-transmitting strands are joined and a large number of light-transmitting strands are arranged in parallel,
The double-sided lenticular lens sheet integrated into a sheet will be described. As shown in FIG. 3, such a double-sided lenticular lens sheet is composed of a plurality of light-transmitting strands 1 arranged in parallel, and adjacent light-transmitting strands 1 joined to form a sheet-like integrated strand. A light absorbing portion 2 is formed between each translucent strand 1 of the sheet. Examples of the translucent strand 1 include thermoplastic resins such as polymethyl methacrylate, polycarbonate, polyvinyl chloride, and polystyrene, which have good transparency and excellent workability, cross-linked silicone resins, cross-linked acrylic resins, and ion-cross-linked resins. A cross-linkable resin such as a resin is used. Among them, polymethyl methacrylate is preferable from the viewpoint of transparency and processability, and polycarbonate resin is preferable from the viewpoint of mechanical properties such as impact resistance, heat resistance, water resistance and dimensional stability.

In the present invention, additives such as a light stabilizer, a heat deterioration preventing agent, a diffusing agent, and a tinting agent may be mixed into the translucent strand 1. When a large amount of a diffusing agent or a tint agent cannot be mixed, only additives such as a light stabilizer and a heat deterioration preventing agent are mixed into the translucent strand 1, and the diffusing agent or the like is added to the translucent front plate. A tint agent or the like can be mixed.

The light absorbing portion 2 is made of an acrylic resin, a polycarbonate resin, a thermoplastic resin such as polyvinyl chloride or polystyrene as a base resin, and contains a light absorbing agent of 0.1%.
The light absorbing agent may be a pigment-based, dye-based, carbon black-based, or a mixture thereof. In addition,
Additives such as a flame retardant and a matting agent may be added to the light absorbing portion 2 as needed. Acrylic resin is preferable as the base resin of the light absorbing section 2, and particularly, when the translucent strand 1 is made of polycarbonate resin, it is preferable that the base resin be acrylic resin. This shows an appropriate interaction between the acrylic resin of the light absorbing portion 2 and the polycarbonate resin of the translucent strand 1, and has little effect on the formation of the lens shape during the solidification process of the polycarbonate resin. This is because the adhesive strength between the translucent strand 1 and the light absorbing portion 2 is also sufficient. As the acrylic resin, a homopolymer of methyl acrylate or methyl methacrylate, a copolymer of methyl acrylate and methyl methacrylate, methyl acrylate or methyl methacrylate and ethyl (meth) acrylate,
Copolymers with (meth) butyl acrylate, (meth) acrylonitrile and the like can be mentioned. Among them, polymethyl methacrylate and a copolymer of polymethyl methacrylate and ethyl acrylate or methyl acrylate are particularly preferred.

The copolymer of polymethyl methacrylate and ethyl acrylate or methyl acrylate is preferably one having a copolymerization amount of ethyl acrylate and / or methyl acrylate in the range of 0 to 15% by weight. , The change in the configuration of the strand and the light absorbing portion 2 from the molten state to the solidification can be appropriately selected, which is preferable in terms of controlling the shape of the lenticular lens, controlling the height of the light absorbing portion 2, and the like. . If the copolymerization amount of ethyl acrylate and / or methyl acrylate exceeds 15% by weight, the interaction with the polycarbonate resin is impaired, and the heat resistance is poor.

Although such a double-sided lenticular lens sheet is manufactured in principle by a melt extrusion technique, a manufacturing example will be described in detail with reference to FIGS. In FIG. 4, 3 is an extruder, 4 is a nozzle holder provided with a nozzle, and discharges a molten thermoplastic resin such as a polycarbonate resin or an acrylic resin from an orifice. The discharge direction may be either upward or downward, but upward discharge is preferable in terms of uniformity of the translucent strand and setting of the pitch. As the nozzle, for example, one having orifices 12 and 13 arranged in a substantially horseshoe shape as shown in FIGS. 5 and 6 (a partially enlarged view of FIG. 5) is used. The orifice 12 discharges a thermoplastic resin for forming a light-transmitting strand, and the orifice 13 discharges a thermoplastic resin containing a light absorbing agent for a light absorbing portion.

Adjacent light-transmitting strands 1 are fused and integrated by a bales effect in which the melted thermoplastic resin expands in the radial direction immediately after being spun from the orifice 12. Thus, an annular sheet 5 in which the light absorbing portions 2 are formed between the translucent strands 1 on one surface is obtained. The annular sheet 5 is pulled up along the inner wall of the annular guide 6, and the annular sheet is spread into a planar sheet by the iron-shaped guide 7 and the rod-shaped straight guide 8, and at the same time, the traveling direction of the sheet is changed by the rod-shaped straight guide 8. , Picked up by nip roller 9 and reel 1
Rolled up to 0. If necessary, the sheet may be slightly stretched by heating.

The cross-sectional shape of the light-transmitting strand 1 of the obtained double-sided lenticular lens sheet can be appropriately selected from various shapes such as a substantially oval shape, a circular shape, and a ball shape depending on the nozzle cross-sectional shape and spinning conditions. The size of the translucent strand 1, from responding to finer pitch of the scan clean the 0.1-0.5 M m is preferred, the present invention is to double-sided lenticular lens sheet having such a fine pitch It is particularly effective.

Further, as shown in FIG. 1, the obtained double-sided lenticular lens sheet 14 presses the light absorbing portion 2 by means such as heating and pressurizing, so that the surface thereof becomes gently curved or flat. It is preferable that the light-absorbing portion 2 covers the surface of the light-transmitting strand 1 so that the light-absorbing portion 2 covers the surface of the light-transmitting strand 1. This is because the ratio (BS ratio) of the light absorber portion occupying the surface of the lenticular lens sheet can be increased, a high-contrast image can be provided, and light emitted from the translucent strand 1 is not blocked. This is because a sufficient horizontal viewing angle can be ensured, and a gap generated between the translucent strand 1 and the light absorbing portion 2 can be eliminated, so that deterioration of an image due to stray light or the like can be suppressed. .

As shown in FIGS. 1 and 2, the projection screen of the present invention has a lenticular lens sheet 14.
And a translucent front plate 15 arranged on the observation side. The light absorbing portion 2 of the lenticular lens sheet 14 and the light-transmitting front plate 15 are bonded at the light absorbing portion 2.

As the translucent front plate 15 of the present invention, various materials having excellent transparency can be used. For example, heat-transmissive materials such as glass, methacrylate resin, polycarbonate resin, vinyl chloride resin and styrene resin can be used. Examples include cross-linking-hardening resins such as plastic resins, cross-linking silicone resins, cross-linking acrylic resins, ion-cross-linking resins, and the like. These materials are formed into a plate by a normal method such as extrusion molding or casting. Can be used. The thickness of such a translucent front plate 15 is not particularly limited, but in order to impart mechanical strength to the projection screen, a thickness of about 2 to 8 mm is used for a glass screen, and a plastic screen is used. In this case, a thickness of about 2 to 10 mm is preferable. Particularly, in consideration of the weight of the projection screen, those having a thickness of about 2 to 5 mm are preferable. Also, with the glass front plate,
It is preferable that a semi-strengthening treatment is applied to prevent the glass from being scattered when broken, and a plastic front plate is preferably subjected to a hard coating treatment to prevent surface flaws.

In the present invention, it is preferable to provide a light diffusing means on the translucent front plate 15 in order to increase the directivity in the vertical direction. Examples of the light diffusing means include matting or hairline treatment on the surface of the translucent front plate 15, formation of a lateral lenticular lens, mixing of a diffusing agent, formation of a diffusing agent layer, and the like. Above all, it is preferable to apply light diffusion means such as mat treatment, hairline treatment or formation of a horizontal lenticular lens in order to avoid image quality deterioration such as image blur. These light diffusing means are not particularly limited, and a commonly used method can be used. However, the gain (G ₀ ) as a projection screen is 3 to 7
And the vertical directivity (αV) is preferably about 5 to 20 degrees. Further, light diffusion means such as matting, hairline treatment or formation of a horizontal lenticular lens is applied to the surface of the light-transmitting front plate 15 which is arranged on the light source side, and the surface on the observation side is preferably a smooth surface. This is preferable because it can impart flatness to the surface of the screen and improve the image quality and appearance of the projection screen.

When a light diffusing agent is used as the light diffusing means, the light transmissive front plate 15 is formed by using a material to which the light diffusing agent is added in advance, and the light diffusing agent is added to the light transmissive front plate 15. It may be dispersed and mixed. However, in order to suppress flare or the like of an image, a light-transmissive front plate 15
It is preferable that a coagulation diffusion layer is present on the surface or in the middle of the layer. The light diffusing agent used for imparting light diffusing property to the translucent front plate 15 has a different refractive index from that of the front plate 15, and includes inorganic particles such as alumina, silica, calcium carbonate, and crosslinked styrene. Polymer beads such as resin particles are exemplified. The particle size of the light diffusing agent is not particularly limited, but is preferably about 0.5 to 30 μm. The content of the light diffusing agent is such that the vertical directivity (αV) is 5 to 20 degrees and the total light transmittance is 40 to 8
It is preferable that the content is contained so as to be about 5%. Specifically, the light diffusing agent is preferably contained in a range of 10 to 70 g / m ² , more preferably ²⁰ to 50 g / m ^2.
m ² . This is because the light diffusing agent content is 10 g
Is less than / m ^2, is because the hot band vertical directivity is narrowed will dressing very, When it exceeds 70 g / m ² the gain (G ₀₎ along with the image darkens Te Risugi low, the time of manufacture This causes productivity problems such as nozzle clogging.

The translucent front plate 15 may contain carbon black, a wavelength-selective absorber, a tint agent, etc. for the purpose of enhancing the contrast. further,
The surface of the light-transmitting front plate 15 may be subjected to various surface treatments such as an anti-reflection coating treatment, a hard coating treatment, or an antistatic treatment for the purpose of preventing reflection, scratches, and adhesion of dust.

In the present invention, the bonding between the lenticular lens sheet 14 and the translucent front plate 15 is performed between the light absorbing portion 2 of the lenticular lens sheet 14 and the translucent front plate 15. This bonding may be performed by an adhesive layer 16 formed by applying an adhesive or a pressure-sensitive adhesive to the surface of the light absorbing section 2, or the light absorbing section 2 may be formed of an adhesive or tacky material. It is also possible to mix an adhesive or tacky material into the light absorbing section 2.

The formation of the adhesive layer 16 on the surface of the light absorbing portion 2 is performed by using a hand roller, a bar coater, a roll coater,
It can be performed by a method of applying an adhesive or a pressure-sensitive adhesive using a spray gun or the like, or by screen printing. In any case, it is preferable that the adhesive or the pressure-sensitive adhesive to be applied does not adhere to the lens surface of the lenticular lens, from the viewpoint of not deteriorating optical characteristics such as color balance. When an adhesive or a pressure-sensitive adhesive is applied by screen printing, a mesh such as a polyester mesh, a nylon mesh, and a stainless steel mesh is used.
The mesh density is preferably about 70 to 400 mesh / inch, more preferably 100 to 30 mesh / inch.
It is about 0 mesh / inch. In the case of applying using a roller or the like, after applying an easily peelable protective agent such as poval to the entire surface of the lenticular lens sheet 14,
After scraping off the protective agent on the upper surface of the light absorbing portion 2 with a squeegee or the like, applying an adhesive or a pressure-sensitive adhesive to the entire surface of the lenticular lens sheet 14 using a roller or the like, and drying and removing the protective layer. This makes it possible to completely prevent the lenticular lens from adhering to the lens surface, such as an adhesive or a pressure-sensitive adhesive.

Various adhesives and pressure-sensitive adhesives such as aqueous type, solvent type, non-solvent type, chemical reaction type, active energy ray curing type, pressure sensitive type and hot melt type can be used. Examples thereof include vinyl acetate, CR, synthetic rubber, natural rubber, vinyl acetate emulsion, vinyl acetate copolymer, EVA, acrylic, isocyanate, epoxy, urethane, and silicone. . Among them, the color after curing and bonding is preferably transparent or black, and particularly when it is necessary to improve the contrast, it is possible to use a mixture of black particles, pigments, and dyes in an adhesive or an adhesive. preferable.

In the projection screen of the present invention, as shown in FIG. 7, a Fresnel lens or a Fresnel lens is usually provided on the light source side of the double-sided lenticular lens sheet 14 together with the lenticular lens sheet 14 and the translucent front plate 15. And a Fresnel lens sheet 17 formed with horizontal lenticular lenses.

[0026]

The present invention will be specifically described below with reference to examples. Example 1 Lenticular lens sheet : A projection screen was manufactured with the apparatus shown in FIG. 4 using the nozzle shown in FIG. The nozzle has an orifice 1 with a hole diameter of 1 mm for translucent strands.
2 are arranged in a circle at a pitch of 1.25 mm,
The hole diameter of the light absorbing portion is 0.5 mm between the orifices 12.
Are arranged in the same number.

A melt of a polycarbonate resin (Iupilon H2000, manufactured by Mitsubishi Gas Chemical Company) is supplied to the orifice 12 at a rate of 0.2 g / min per orifice, and the orifice 13 is made of polymethyl methacrylate (VH, manufactured by Mitsubishi Rayon Co.). 4% by weight and 2% by weight of carbon black were added to a mixed melt of 0.0% per orifice.
It was fed at 2 g / min and extruded upward at a nozzle temperature of 260 ° C. After being extruded, the iron-shaped guide 7 and the rod-shaped straight guide 8 are pulled up at a speed of 1.3 m / min along the inner wall of the annular guide 6 while pulling up the annular sheet 5 formed by fusing the adjacent translucent strands. And rolled up on a reel 10. The sheet was cooled by passing warm water of 40 ° C. into each guide.
In the obtained sheet, 1,000 translucent strands were completely fused and integrated at a pitch of 0.41 mm, and were uniformly arranged in a plane, and a light absorbing portion was formed between the translucent strands. . The obtained sheet is 1m with a cutter.
To obtain a double-sided lenticular lens sheet.

The obtained double-sided lenticular lens sheet is placed between a heating roll and a rubber roll having a surface coated with a polyimide mat film so that the light absorbing portion 2 of the double-sided lenticular lens sheet 14 and the heating roll are in contact with each other. Then, a silicone rubber sheet having a thickness of 3 mm is interposed on the back side, and the light is passed through the translucent strand 1 of the double-sided lenticular lens sheet 14 so that the longitudinal direction and the roll are perpendicular to each other. The part 2 is pressed and deformed, and the double-sided lenticular lens 14 as shown in FIG.
I got The distance between the heating roll and the rubber roll is 2 m
m, the roll speed was set at 0.7 m / min, and the roll temperature of the heating roll was set at 190 ° C.

Fresnel lens sheet : The ultraviolet-curable resin composition is spread on a lens mold composed of a nickel stamper having a circular Fresnel lens pattern having a pitch of 0.12 mm, and a polycarbonate sheet having a thickness of 0.5 mm is laminated thereon. After the combination, the excess UV-curable resin composition is removed by a pressure roll, and 320 to 390.
1000 mJ / cm with integrated UV irradiation
Irradiation was performed ² to polymerize and cure the ultraviolet curable resin composition to obtain a Fresnel lens sheet 17 integrated with the polycarbonate sheet.

Translucent front plate : 3 mm thick transparent polymethyl methacrylate resin plate (# 001 manufactured by Mitsubishi Rayon Co., Ltd.)
Using a hot press molding machine, together with a stainless steel plate subjected to sandblasting, at a temperature of 180 ° C. and a pressure of 50K.
Press molding was performed at g / cm ² to obtain a single-sided mat translucent front plate 15 having a surface gloss value of 20.

An aqueous pressure-sensitive adhesive for screen printing (154 manufactured by Three Bond Co., Ltd.) was applied to the upper surface of the light absorbing portion 2 of the obtained double-sided lenticular lens sheet 14 using a polyester screen mesh having a mesh density of 250 / inch.
9) was applied by screen printing to form an adhesive layer 16. Next, the light-transmitting front plate 15 and the light-absorbing portion 2 of the double-sided lenticular lens sheet 14 are overlapped so that the sandblast surface of the light-transmitting front plate 15 is in contact with the light-absorbing portion 2 of the double-sided lenticular lens sheet 14. Bonded and integrated. This double-sided lenticular lens sheet 1
4 and a translucent front plate 15, a Fresnel lens sheet 17 on the light source side, a translucent front plate 15 on the observation side, and a double-sided lenticular lens sheet 14 between them. And a projection screen.

This projection screen is used as a 50-inch projection television (Pioneer SD-P50BS4).
When I attached it to the camera and observed the video, it had a high resolution,
A high-quality screen free of multiple images, flare, and image distortion was obtained. Further, the obtained projection screen is placed at a height of 1 m with a diameter of 30 m with the translucent front plate 15 facing upward.
mm, when a sphere weighing 100 g was dropped, the sphere did not bounce or crack on the translucent front plate 15,
It had sufficient strength.

Example 2 Same double-sided lenticular lens sheet 14 as in Example 1
Using a polyester screen mesh having a mesh density of 250 / inch, an aqueous pressure-sensitive adhesive for screen printing (1549, manufactured by Three Bond Co.) mixed with carbon black is applied to the upper surface of the light absorbing portion 2 by screen printing to form an adhesive layer. No. 16 was formed. Next, the same sand blast surface of the translucent front plate 15 as in Example 1 and the light absorbing portion 2 of the double-sided lenticular lens sheet 14 are overlapped so as to be in contact with each other, and the light is transmitted through the surface of the light absorbing portion 2 of the double-sided lenticular lens sheet 14. It was bonded and integrated with the optical front plate 15. The laminated body of the double-sided lenticular lens sheet 14 and the light-transmitting front plate 15, the Fresnel lens sheet 17 (same as in Example 1) on the light source side, and the light-transmitting front plate 1 on the observation side
5 and a double-sided lenticular lens sheet 17
The projection screen was constructed by arranging the projection screens.

The projection screen is used as a 50-inch projection television (Pioneer SD-P50BS4).
When I attached it to the camera and observed the video, it had a high resolution,
An image with high contrast was obtained without multiple images, flare, image distortion and the like. When the sphere having a diameter of 30 mm and a weight of 100 g was dropped from a height of 1 m on the obtained projection screen with the translucent front plate 15 facing upward, the sphere rebounded from the translucent front plate 15. No cracks, cracks, etc. occurred, and it had sufficient strength.

Example 3 Lenticular lens sheet : A 2 mm thick transparent polymethyl methacrylate resin plate (Acrylite # 001 manufactured by Mitsubishi Rayon Co., Ltd.) was heated at a temperature of 1 mm using a hot press molding machine.
Heat press molding was performed under the conditions of 80 ° C. and a pressure of 50 kg / cm ² , and the pitch of the sectional shape was 0.6 m as shown in FIG.
m double-sided lenticular lens sheet 14 was obtained. Using a nylon mesh having a mesh density of 150 mesh / inch, a light absorbing agent 2 (Vinate Black, manufactured by Nagase Screen Printing Laboratory Co., Ltd.) is applied to the convex portions for the light absorbing portions of the obtained double-sided lenticular lens sheet 14 by screen printing. did.

Fresnel lens sheet : A transparent polymethyl methacrylate resin plate (Acrylite # 001, manufactured by Mitsubishi Rayon Co., Ltd.) having a thickness of 3 mm was heated using a hot press molding machine.
Heat press molding was performed under the conditions of a temperature of 180 ° C. and a pressure of 50 kg / cm ² to obtain a circular Fresnel lens sheet 17 having a pitch of 0.176 mm.

On the surface of the light absorbing portion 2 of the obtained double-sided lenticular lens sheet 14, a hot-melt adhesive containing carbon black (Evergrip PS-16 manufactured by AC I Japan Co., Ltd.) was applied using a roll coater for 130 minutes. C. to form an adhesive layer 16. Next, a matte surface of a tempered glass plate 15 (Tempalite manufactured by Asahi Glass Co., Ltd.) having a matte treatment on one side with a thickness of 4 mm is overlapped so that the light absorbing portion 2 of the double-sided lenticular lens sheet 14 is in contact with the double-sided lenticular. Lens sheet 14
And the tempered glass plate 15 was bonded and integrated with the light absorbing portion 2 of FIG.
The laminated body of the double-sided lenticular lens sheet 14 and the tempered glass plate 15 is provided on the light source side with the Fresnel lens sheet 1
7 (the same as in Example 1), and a tempered glass plate 15
Were arranged such that the lenticular lens sheet 14 was located between them to form a projection screen.

This projection screen is used as a 50-inch projection television (Pioneer SD-P50BS4).
When I attached it to the camera and observed the video, it had a high resolution,
An excellent image with high contrast was obtained without multiple images, flare, image distortion and the like. Also, when the obtained projection screen was placed with the tempered glass plate 15 facing upward and a sphere having a diameter of 30 mm and a weight of 100 g was dropped from a height of 1 m, the sphere was bounced off the tempered glass plate 15, cracked, etc. Did not occur, and had sufficient strength.

Comparative Example 1 Same double-sided lenticular lens sheet 14 as in Example 1
Using the Fresnel lens sheet 17, the Fresnel lens sheet 17 was disposed on the light source side, and the double-sided lenticular lens sheet 14 was disposed on the observation side, and the peripheral portion thereof was sandwiched and fixed to form a projection screen. When this projection screen was mounted on a 50-inch projection television (SD-P50BS4 manufactured by Pioneer) to observe an image, an image having a high resolution was obtained. However, the double-sided lenticular lens sheet 14 and the Fresnel lens sheet 17 could not be sufficiently adhered to each other, and the surface of the projection screen was partially wavy, resulting in partial blurring of the image and poor appearance. When a 70 g sphere was dropped from a height of 1 m on the obtained projection screen with the double-sided lenticular lens sheet 14 facing upward, the sphere destroyed the projection screen and penetrated.

Comparative Example 2 The same double-sided lenticular lens sheet 1 as in Example 1
4. Translucent front plate 15 and Fresnel lens sheet 17
, The Fresnel lens sheet 17 is arranged on the light source side, the translucent front plate 15 is arranged on the observation side, and the double-sided lenticular lens sheet 14 is arranged between them, and the peripheral part thereof is sandwiched and fixed. The projection screen was constructed. When this projection screen was attached to a 50-inch projection television (Pioneer SD-P50BS4) and the image was observed, multiple images, flare, image distortion, etc. were partially generated.

[0041]

According to the projection screen of the present invention, the lenticular lens sheet and the translucent front plate are bonded to each other at the light absorbing portion of the lenticular lens sheet, so that the projection screen has high resolution and mechanical strength, and has multiple images, It is possible to provide a high-quality image free from flare and image distortion.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a part of a double-sided lenticular lens sheet and a light-transmitting front plate of the present invention.

FIG. 2 is a cross-sectional view showing a part of a double-sided lenticular lens sheet and a light-transmitting front plate of the present invention.

FIG. 3 is a perspective view showing a part of the double-sided lenticular lens sheet of the present invention.

FIG. 4 is a schematic view of an apparatus used for manufacturing the projection screen of the present invention.

FIG. 5 is a schematic view of a nozzle used for manufacturing the projection screen of the present invention.

FIG. 6 is a schematic enlarged view showing a part of a nozzle used for manufacturing the projection screen of the present invention.

FIG. 7 is a partial sectional view schematically showing a projection screen of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Translucent strand 2 Light absorption part 3 Extruder 4 Nozzle holder 5 Translucent strand annular sheet 6 Annular guide 7 Iron-shaped guide 8 Rod-shaped straight guide 9 Nip roller 10 Reel 11 Nozzle 12 Translucent strand orifice 13 Light Orifice for absorption part 14 Double-sided lenticular lens sheet 15 Translucent front plate 16 Adhesive layer 17 Fresnel lens sheet

Claims (2)

(57) [Claims] At least one surface has a pitch of 0.1 to 0.1.
A lenticular lens sheet in which a 0.5 mm lenticular lens and a light absorbing portion are formed, and the light absorbing portion is provided so as to protrude from the lens surface of the lenticular lens;
Having a light-transmitting front plate disposed on the observation surface side of the lenticular lens sheet, wherein the lenticular lens sheet and the light-transmitting front plate are bonded only at a light absorbing portion of the lenticular lens sheet. Projection screen. 2. The projection screen according to claim 1, wherein said translucent front plate has a light diffusing means .