JPH0822077A - Transmission type screen - Google Patents

Abstract

PURPOSE:To make a lens sheet hardly damaged, to have scattering prevention performance and to reduce a cost by bonding film at a part where light source light is not transmitted on the front surface of the lens sheet installed nearest to an observation side. CONSTITUTION:Film 7 is stuck only the front surface of a projected part 5 i.e., the surface of the light shielding layer 3 of a top through an adhesive layer 10, and the surface of a convex lens is separated from the film 7 and the adhesive layer 10. Incident light from a projector enters the inside of the lens sheet 1, and is transmitted forward passing a transmission part other than the light shielding layer 3 (namely non-transmisson part). The transmitted light passes through transparent film 7 next and is led to an observer. By this constitution, the front surface of the lens sheet is protected and further, in the case that the lens sheet 1 is broken because of impact on the lens sheet 1, the film 7 itself is not torn and is held in a state where a torn piece is stuck on the film, so that the scattering of the lens sheet 1 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmissive screen mainly used for rear projection type projectors such as video projectors and slide projectors.

[0002]

2. Description of the Related Art Conventionally, as a transmissive screen used in video projectors, slide projectors, etc., a lenticular lens sheet based on a synthetic resin material such as polymethylmethacrylate is used alone or in combination with other lens sheets. Known to be used.

As this lenticular lens sheet, as shown in FIG. 18, a band-shaped light-shielding layer 3 is formed in a vertical direction on a portion of the surface on the observer side where image light is not transmitted, or as shown in FIG. A convex portion 5 is provided in a portion of the surface of the observer side through which the image light is not transmitted, and an observation side lens portion 4 is provided between the convex portions 5, and the convex portion 5 has a top portion. Known are those having a light-shielding layer 3 formed thereon.

However, since the lenticular lens sheet having the above-mentioned structure is usually arranged on the side closest to the observer, the following problems occur when it is used as a product.

First, the light-shielding layer is easily peeled off, which causes a problem that the light-shielding layer is easily peeled off when cleaning or scratching with a nail or the like.

Further, the acrylic resin, vinyl chloride resin, etc. used for the base material of the lens sheet are easily scratched, and in particular, the observation side lens portion 4 and the convex portion 5 are very fine, so that they are simple. There is also a problem that the scratch resistance is inferior, such as scratches on the surface and impair the performance as a lens for projecting image light.

Furthermore, when an impact is applied to the lens sheet, the lens sheet is easily cracked and finely crushed to generate sharp fragments, which are scattered and dangerous. , Called anti-scattering property) was desired.

In order to solve such a problem, a method of attaching a surface protective plate such as an inorganic glass or an acrylic resin to the observation surface of the screen body (see Japanese Utility Model Laid-Open No. 3-12236) or a scratch-resistant film hard-coated The method of laminating the film on the lens sheet is used.

On the other hand, as a known transmissive screen,
As shown in FIG. 21, it is known that the Fresnel lens sheet 6 is arranged behind the lenticular lens sheet of FIG. The Fresnel lens sheet 6 is provided to collimate the light from the projector. A diffusing agent is mixed in at least one of the lenticular lens sheet and the Fresnel lens sheet in order to widen the angle of view of the screen.

[0010]

However, in the case of FIG. 18 or FIG. 19, if a surface protection plate such as an acrylic plate or an inorganic glass plate is used, it is necessary to attach each screen, which leads to poor productivity. Further, since the cost of the screen increases due to the problem and the cost of the protective plate itself, a transmissive screen having a surface protection function and low cost has been desired.

Further, the scattering prevention property has not been solved yet.

On the other hand, a lenticular lens sheet laminated with a scratch-resistant film can prevent fine scratches on the lens, but since the light-shielding layer is formed on the film after shaping, the light-shielding layer of a normal screen is used. Like the above, it was vulnerable to scratches and was susceptible to chipping. Further, since the lenticular lens sheet having the scratch-resistant film laminated has the lens pattern and the convex portion formed after the film is laminated on the base material sheet or at the same time, as shown in FIG. Since it is opened in a concave shape, there is a problem that a sharp object enters this portion and the convex portion 5 is scraped off in a form of being caught.

Further, in a transmissive screen composed of a combination of the above lenticular lens sheet and another lens sheet, the adhesiveness between the lens sheets decreases due to the difference in the moisture absorption state between the lens sheets, and the original There was also a problem that performance could not be shown.

On the other hand, in the screen shown in FIG.
A diffusing agent is dispersed in the lenticular sheet and Fresnel lens, and the effect of this diffusing agent causes unnecessary diffusion of light from the light source in the lens from the light entering the lens to the light exiting the lens. Efficiency is decreasing. Also,
Since the incident angles of the R, G, and B projectors with respect to the screen are different from each other, there occurs a phenomenon that the image is bluish or reddish (hereinafter referred to as color shift) depending on the screen observation position. Furthermore, since the screen surface has a lens shape, diffuse reflection occurs when the lenticular sheet surface is exposed to external light, the screen surface becomes whitish and the contrast deteriorates, and the glossiness of images such as metal is not reproduced. There is a problem.

The present invention has been made in order to solve the above-mentioned problems, and it is difficult for the light-exiting surface (the surface on the observer side) of a screen on which a lens, a light-shielding layer, etc. are formed to be scratched,
In addition, it is an object to obtain a transmissive screen that exhibits excellent shatterproof property even when the screen is broken by impact, and in addition, a good image can be obtained even when used in combination with other lens sheets. It is an object to provide a transmissive screen that can be used at low cost.

Another object of the present invention is to provide a transmissive screen which has a high resolution, a small color shift, a high contrast and a glossy image.

[0017]

The present invention has been completed as a result of studies for solving the above problems, and a lens sheet alone having optical functions such as light condensing and diffusing,
Alternatively, in a transmissive screen formed by stacking a plurality of lens sheets having different optical functions, a plurality of lenses 2 that collects light from a light source are provided on the back surface of the lens sheet 1 that is arranged closest to the observation side. Has been
This is a transmissive screen characterized in that a transparent film 7 is adhered to a non-transmissive portion of the light source light condensed by a plurality of lenses 2 on the front surface.

The lens sheet arranged closest to the observation side may be provided with a convex portion 5 on the non-transparent portion on the front surface, and the transparent film 7 may be bonded to the convex portion 5.

The lens 4 can be formed between the convex portions 5 of the lens sheet 1 to which the film 7 is adhered.

Further, a substantially transparent adhesive layer 10 is formed on the surface of the film 7 on the light source side, and the transparent adhesive layer 10 makes the film 7 of the convex portion 5 of the lens sheet 1 arranged closest to the observation side. It may be adhered to the top.

Further, the light-shielding layer 3 is formed in the non-transmissive portion of the front surface of the lens sheet 1 which is arranged closest to the observation side.
The film 7 may be adhered on the above, and in the case of the lens sheet 1 in which the convex portion 5 is formed in the non-transmissive portion,
The light shielding layer 3 may be formed on the top of the convex portion 5, and the film 7 may be bonded onto the light shielding layer 3.

Further, the film 7 may be adhered by an adhesive layer 3'having a black color.

Further, the film 7 is selected by the resin forming the lens sheet 1 so that the hygroscopic elongation of the film 7 becomes smaller than the hygroscopic elongation of the lens sheet 1 arranged closest to the observation side. You can also

A hard coat layer 8 may be provided on the viewer side surface of the transparent film 7.

On the surface of the film 7 on the observation side, a lenticular lens for vertical diffusion, a prism for correcting the optical axis in the vertical direction, or a linear Fresnel lens in which a ridge line for refracting the projected light mainly in the vertical direction extends in the horizontal direction (hereinafter referred to as vertical A lens pattern 11 for changing the optical characteristics in the direction) may be provided.

The lens pattern 11 for changing the optical characteristics in the vertical direction may be formed by using an ionizing radiation curable resin having a hardness higher than that of the film 7.

The film 7 may be subjected to a coloring treatment for absorbing external light.

The coloring treatment for absorbing outside light is
The transmittance of film 7 is 570nm at maximum near 450nm
You may give it so that it may become the minimum in the vicinity.

Further, when the surface of the film 7 on the observation side, both surfaces of the film 7, or the front surface of the lens sheet disposed on the most observation side, or a portion obtained by combining any of these is subjected to antistatic treatment, It is preferable because dust can be prevented from adhering to the surface on the film observation side and between the film 7 and the lens sheet 1. Furthermore, an acrylic resin having impact resistance may be used for the lens sheet 1.

On the back surface of the transparent film 7, a light diffusing section 1 is provided.
3 can be provided.

Further, the lens sheet 1 may be made to contain no diffusing agent.

The light diffusion portion 13 can be formed only between the non-transmissive portions 3.

FIG. 1 is a perspective view of a transmission type projection screen according to the present invention. This screen includes a transparent film 7, an adhesive layer 10, and a light shielding layer 3 in order from the side closest to the observer.
And a lens sheet 1.

The lens sheet 1 faces the light source (not shown), that is, the projector, and is at the rearmost side. The lens sheet 1 has a publicly known lenticular lens 2 on its rear surface in the vertical direction, and has a large number of parallel convex portions 5 extending in the vertical direction on its front surface. Adjacent convex portion 5
A lens 4 having a convex shape is formed between the two. A light shielding layer 3 is formed on the front surface of each convex portion 5.
The film 7 is bonded to the front surface of the lens sheet 1 by the adhesive layer 10.

What is important here is that the film 7 is adhered only to the front surface of the convex portion 5, that is, the surface of the light shielding layer 3 at the top via the adhesive layer 10, and the surface of the convex lens 4 is adhered to the film 7. And that it is separated from the adhesive layer 10. Light incident from the projector as shown by an arrow A in FIG. 1 enters the lens sheet 1 and is transmitted forward through a transmissive portion other than the light shielding layer 3 (that is, a non-transmissive portion). This transmitted light then travels through the transparent film 7 to the observer as indicated by arrow B.

FIG. 2 is a sectional view showing another example of the screen of the present invention. In addition to the constitution of FIG.
The screen has the hard coat layer 8 provided on the observer side surface.

FIG. 3 is a view showing another example of the screen of the present invention. The hard coat layer 8, the transparent film 7, the black adhesive layer 3 ', and the lens sheet 1 are arranged in this order from the viewer side.
Shows a screen arranged in sequence. The black adhesive layer 3 ′ is the convex portion 5 formed on the lens sheet 1.
Is provided on the top of the sheet, and the film 7 and the lens sheet 1 are bonded together, and the performance as a light shielding layer is also shown.

As a material for the lens sheet 1, a transparent synthetic resin can be used. For example, acrylic resin such as polymethylmethacrylate (PMMA), vinyl chloride resin, polycarbonate, polystyrene and the like can be mentioned, but from the viewpoint of preventing cracking against impact, acrylic of impact resistance grade in which rubber component is polymerized or dispersed in acrylic is used. It is preferable to use a resin.

Further, it may be a sheet molded using an ionizing radiation curable resin such as an epoxy acrylate type, urethane acrylate type, unsaturated polyester type or the like.

The material of the film 7 is a transparent resin, for example, polyethylene terephthalate (PET) can be used when the acrylic resin is used for the lens sheet 1, and polypropylene or the like can be used when polycarbonate is used. Can be used. Nylon can also be used.

The adhesive used for the adhesive layer 3 is preferably an adhesive that exhibits adhesiveness only under a certain condition such as hot pressing and ultrasonic waves. For example, a vinyl chloride-vinyl acetate copolymer. Examples thereof include vinyl chloride and vinyl chloride, ethylene-vinyl acetate copolymer (EVA), and the like in which carbon particles or the like are dispersed can be used as the black adhesive layer 3 '.

The hard coat layer 8 may be subjected to a treatment for diffusing external light (hereinafter referred to as a non-glare treatment) such as forming fine irregularities 9 on the surface thereof as shown in FIG. An antireflection coating may be applied to the surface of the hard coat layer 8.

In order to change the optical characteristics of the transmitted light in the vertical direction, a lens pattern 1 having protrusions 11a extending in the horizontal direction may be formed on the front surface of the transparent film 7 as shown in FIG. Further, an antireflection film may be provided on the surface of the lens pattern.

In the figure, only the case where the lenticular lenses 2 are arranged parallel to the back surface of the lens sheet 1 is shown, but the present invention is not limited to the lenticular lens, and it is a lens sheet having a fly-eye lens formed on the back surface, for example. hand,
It may be a lens sheet in which non-transmissive portions of the light source light are present in a grid pattern on the front surface of the lens sheet.

In the transmissive screen of the present invention, since the transparent film 7 is adhered to the observation side of the lens sheet 1 arranged closest to the observer at the light non-transmissive portion of the lens sheet, the front surface of the lens sheet is protected. In addition, even if the lens sheet 1 is shocked and the lens sheet 1 is broken, the film 7 itself is not broken, and the fragments are held as adhered to the film, and the fragments of the lens sheet 1 scatter. Can be prevented.

The effects of scratch resistance and the like are further enhanced by the fact that the film 7 itself is protected by subjecting the surface of the film 7 to a hard coat treatment.

In the transmissive screen of the present invention, the film 7 is not adhered to the entire lens sheet 1, but
Since the film 7 or the adhesive layer 10 does not come into contact with the light source light emitting portion on the front surface of the lens sheet 1, since the film 7 or the adhesive layer 10 is adhered only on the front surface of the lens sheet 1 where the light source light is not transmitted. It is possible to protect the front surface of the lens sheet 1 without affecting the optical characteristics of the light emitting portion.

Further, in the present invention, the material can be selected so that the hygroscopic elongation of the film 7 is smaller than the hygroscopic elongation of the lens sheet 1. By doing so, when the screen is curved due to moisture absorption. , Is curved so as to be convex toward the light source side, and this curvature acts to enhance adhesion with a lens sheet having a different optical function such as a Fresnel lens mounted on the light source side of the lens sheet 1,
It is possible to prevent the image from being blurred due to the floating screen.

The lens pattern 11 provided on the observation side surface of the film 7 changes the optical characteristics of the transmitted light in the vertical direction. Further, the lens pattern 11 has high strength and good scratch resistance by being formed of an ionizing radiation curable resin having a hardness higher than that of the film 7.
By providing such a lens pattern, the same effect as that when the surface of the film 7 is subjected to the non-glare treatment is reduced.

Further, in the present invention, the film contrast can be improved by subjecting the film 7 to a coloring treatment for absorbing external light using a dye or a pigment.

In particular, in the projection apparatus currently used, the output of the blue projector is
Since it is inferior to the output of color, the transmittance of the colored film is set to be maximum near 450 nm so as not to reduce the blue transmittance on the screen.
By setting the minimum value in the vicinity of 570 nm, which is the maximum wavelength of luminosity factor, a brighter image can be obtained and the reflected light is weaker than that in the case where the transmittance in the entire visible light wavelength range is uniformly reduced. be able to.

Further, the adhesive layer 3'having a black color, or
By using an adhesive that exhibits adhesiveness by applying conditions such as heat and pressure to the transparent adhesive layer 10, while preventing dust from adhering to the surface of the adhesive layer, as shown in FIG. It is possible to avoid the problem of the adhesive 12 squeezing out to the light transmitting portion that occurs when the normal adhesive 12 is applied to the non-transmissive portion 3 and the coating film 7 is attached.

Further, in the present invention, since the film 7 is provided on the surface of the lens sheet 1, it is necessary to consider the influence of reflection of external light on the film 7. Among them, the reflection at the adhesive portion of the film 7 Since the film 7 is adhered to the black adhesive layer 3'or the light-shielding layer 3, the external light incident on this portion is absorbed without being reflected, and therefore the conventional protective plate is simply attached. The reflectance of outside light is lower than that of the screen, and the contrast is improved.

8 and 9 show another example of the screen of the present invention. In this example, the same reference numerals as those in FIG. 1 indicate the equivalent portions, and the description thereof will be omitted. In this example, the light diffusion layer 1 is provided on the rear side of the transparent film 7.
3 is formed, and the diffusion layer 13 is joined to the light shielding layer 3 by the adhesive layer 10. In this example, the adhesive layer 10 is formed on the entire surface of the diffusion layer 13. In this case, the adhesive layer is preferably an adhesive that exhibits adhesiveness only under certain conditions such as hot pressing and ultrasonic waves.

FIG. 10 shows an example in which the diffusion layer 13 is adhered by an adhesive layer 3'having a black color. In this case, the adhesive layer 10 shown in FIG. 9 is not used.

In the example shown in FIG. 11, the transparent film 7 is adhered to the lens sheet 1 by the black adhesive layer 3 '. The diffusion layer 13 is formed only in a portion facing the light emitting convex lens 4.

The diffusion layer 13 may be a diffusion layer in which glass, silica, alumina, insoluble plastic, talc, etc. are dispersed in a resin such as acrylic or vinyl chloride, or may be formed by embossing the back surface of the film. it can. In this case, the diffusion layer 13 is not a layer but a diffusion portion as a part of the transparent film 7.

Thus, by adhering the transparent film 7 having a diffusion layer or a diffusion portion on the back surface to the lens sheet 1 at its non-transmissive portion, the diffusing agent of the lens sheet 1 can be reduced, and in the lens. It is possible to reduce light loss due to diffusion of light from the light source and deterioration of resolution. Further, since the diffusing agent is present at a high density on the back surface of the film, color shift can be improved, and since the film 7 is attached to the surface of the lens sheet 1 closest to the viewer, the screen surface becomes a mirror surface. . Therefore, diffuse reflection of external light is eliminated, whitishness is suppressed, and the glossiness of the image is faithfully reproduced. Further, all the lens sheets constituting the transmissive screen do not contain a diffusing agent, the non-transmissive portion becomes large due to the reduction of the diffused light only on the back surface of the transparent film 7, and accordingly the light-shielding layer formed in the non-transmissive portion Can be increased and the contrast can be improved.

When the diffusion layer on the back surface of the film 7 is limited to between the non-light emitting convex portions, diffuse reflection of external light on the diffusion layer portion is reduced as compared with the case where the entire back surface of the film is formed as the diffusion layer. In addition, since the absorption amount of external light in the light shielding layer is increased, both the appearance and the contrast are improved.

The diffusion layer 13 can be formed as shown in FIGS. As a bonding method at this time, a method using a black adhesive layer 3'as shown in FIG. 11 and a substantially transparent adhesive layer 10 formed on the back surface of the diffusion layer 13 as shown in FIG. 12 are used. Method, a method of using the adhesive layer 10 formed on the entire film surface provided with the diffusion layer 13 shown in FIG. 13, and an adhesive layer 10 formed so as to fill the space between the respective diffusion layers 13 as shown in FIG. The method used can be applied.

FIGS. 15 to 17 are enlarged views of the portion where the diffusion layer 13 is formed. In the example shown in FIG. 15, the transparent film 7 has a diffusing portion 13a containing a diffusing agent 14 along the front surface 7a thereof. In this example, even if the front surface 7a is mirror-finished, since the diffusing agent 14 is inside the surface, the image does not appear glossy due to the reflection of external light on the mirror surface portion. On the other hand, in the transparent film 7 shown in FIG.
The diffusion portion 13b including 4 is located slightly inside from the mirror surface 7a via the transparent layer 15. In this example, the transparent layer 15
Due to this, reflection of external light on the mirror surface portion gives a glossy feeling to the image. In the example of FIG. 17, the diffusion part 13c is formed by the matte surface on the back surface of the transparent film 7. The diffusing agent 14 can be added under the following conditions. Diffusing agent particle size 5 to 50 μm Refractive index difference from base material 0.02 to 0.10 Diffusing agent addition amount 5 to 25 parts Diffusion layer thickness 500 μm or less

[0062]

EXAMPLES The present invention will be described in more detail below with reference to examples. First Embodiment FIG. 1 is a diagram illustrating a first embodiment of the present invention.

A lenticular lens sheet 1 (93) made of acrylic resin having a lens pitch of 0.8 mm and a ratio of the lenticular lens 4 on the observation side to the convex portion 5 of 52:48.
(0 × 700 mm) was extruded, and the light shielding layer 3 was formed on the convex portion 5 by printing. The thickness 125 in which the adhesive layer 10 made of vinyl chloride and vinyl chloride is provided on one surface of the film to a thickness of 4 μm
Using a thermal transfer roll, a PET film (930 × 700 mm) 7 of μm is thermally laminated on the lenticular lens sheet 1 at 200 ° C. and a speed of 3 m / min,
A transparent screen was obtained in which a transparent film was bonded only to the convex portions formed in the non-transmissive portion of the light from the light source.

The obtained screen was not easily scratched by the lenticular lens on the observer side, the convex portion, or the light-shielding layer formed on the top of the convex portion, and even if the lenticular lens sheet was broken by the falling ball test, fragments were broken. Was confirmed not to scatter.

Embodiment 2 FIG. 2 is a diagram for explaining the second embodiment of the present invention. A lenticular lens sheet 1 having a lens pitch of 0.8 mm and a ratio of the lenticular lens 4 on the observing side to the convex portion 5 of 52:48 is extruded and molded using an impact-resistant grade acrylic resin. Formed the light shielding layer 3 by printing (930 × 700 mm). On the other hand, a 125 μm-thick PET film 7 having a 5 μm-thick hard coat layer 8 using an acrylic hard coat material on the front surface and a 4 μm-thick vinyl chloride resin as the adhesive layer 10 on the back surface Using a thermal transfer roll at 200 ° C, 3 m / min
Thermal lamination was performed at a speed of.

In the screen thus obtained, since the surface hardness of the film 7 is as high as 2H or more in the pencil hardness test, the lens sheet is not easily scratched, and is also good in the scratch resistance test of rubbing the surface with steel wool. The result was excellent and the appearance was not deteriorated. Also, the strength of the lenticular lens sheet against impact is increased,
It was confirmed by a falling ball test that fragments were not scattered even when the lenticular lens sheet was broken.

Embodiment 3 FIG. 4 is a diagram for explaining the third embodiment of the present invention. Lens pitch is 0.8m using impact-resistant acrylic resin
m, the lenticular lens sheet 1 (93) in which the ratio between the lenticular lens 4 on the observer side and the convex portion 5 is 52:48.
(0 × 700 mm) was extruded, and a vinyl chloride resin layer 3 ′ in which carbon particles were dispersed was formed on the convex portion 5 by offset printing to a thickness of 5 μm. Separately from this, a UV-curable hard coat ink is applied to one surface of the film 7 and is applied by using a plate whose surface is roughened by sandblasting or the like, and is exposed to UV to cure the ink. A PET film (thickness 125 μm) 7 provided with the hard coat layer 8 which was subjected to the non-glare treatment 9 was molded.

Then, this PET film 7 was sandwiched by a thermal transfer roll with the surface on the opposite side on which the hard coat layer 8 was provided facing the convex portion forming surface of the lenticular lens sheet 1, and at 200 ° C., 3 m / min. The lenticular lens sheet 1 was allowed to pass through at the speed of No. 1 and was heat-laminated to obtain a transmissive screen having antiglare properties, and the lenticular lens on the observation side and the convex portion were not easily scratched. In addition, the screen thus obtained did not scatter when the lens sheet was broken by the falling ball test.

Embodiment 4 FIG. 5 is a diagram showing a fourth embodiment of the present invention. Consists of impact-grade acrylic resin and has convex parts 5
The light-shielding layer 3 is printed on the lens, the lens pitch is 0.85 mm, and the ratio of the lenticular lens 4 on the observation side to the convex portion 5 is 55: 4.
For the lenticular lens sheet of 5 (vertical diffusion half-value angle of 5 °), a lenticular lens for vertical diffusion having a lens pitch of 0.1 mm is formed by a UV curable acrylic hard coat ink having a hardness higher than that of the PET film 7 on the observation side surface. 11 (vertical half-value angle 4 °) was applied, and a PET film 7 having a thickness of 125 μm provided with a 4 μm vinyl chloride adhesive layer 10 on the side to be bonded to the lens sheet 1 was heated at 200 ° C. for 3 m with a thermal transfer roll. Thermal lamination was performed at a speed of / min.

The vertical diffusion half-value angle of the obtained screen is
20 compared to the lenticular lens sheet before lamination
% And the vertical viewing angle became wider. In addition, it was confirmed that the reflected image was blurred and had an antiglare effect, and that the film surface hardness was high, the lenticular lens sheet 1 was not easily scratched, and when broken, fragments were not scattered. .

Embodiment 5 FIG. 6 is a diagram showing a fifth embodiment of the present invention. It is made of impact-resistant grade acrylic resin and has a lens pitch of 0.
Lenticular lens sheet 1 (9, 85 mm, the ratio of the lenticular lens 4 on the observation side and the convex portion 5 is 55:45).
(30 × 700 mm) convex portion 5 is provided with 4 μm of vinyl chloride resin layer 3 ′ in which carbon particles are dispersed by offset printing.
m. Next, a hard coat layer is provided, and the PET film 7'colored so that the transmittance is maximum at around 450 nm and minimum at around 570 nm is thermally laminated at 200 ° C. at a speed of 3 m / min by a thermal transfer roll. Done and got the screen.

The obtained screen has a contrast ratio of 28% as compared with the lenticular lens sheet before lamination.
It was also improved by 10% as compared with the case of laminating an uncolored film. Furthermore, the surface hardness of the film is high,
It was confirmed that the lenticular lens sheet was not easily scratched, and that even if it cracked, the fragments would not scatter.

Example 6 An aqueous solution containing 2% by weight of a cationic antistatic agent (Eretro Stripper QN: manufactured by Kao) was previously applied to the surface of the observation side by a spray gun and air-dried to perform antistatic treatment, and then the convex portion was formed. The light-shielding layer 3 is printed on the lens 5 to have a lens pitch of 0.85 mm, the lenticular lens 4 on the observation side and the convex portion 5
In the lenticular lens sheet with a ratio of 55:45 (930 × 700 mm), a cationic antistatic agent (Eretro Stripper QN: made by Kao) is provided on the surface to be observed.
An aqueous solution containing 2% by weight of
A PET film (thickness: 125 μm) 7 having a 4 μm vinyl chloride / vinyl chloride adhesive layer 10 provided on the surface to be the lens sheet 1 side after air-drying was applied with a heat transfer roll.
Thermal lamination was carried out at a temperature of 3 ° C / min and a screen was obtained.

The surface resistivity of the film surface of the obtained screen was measured by the method according to JIS K6911 and found to be 2.5 × 10 ¹⁰ Ω. When this screen was left in a normal environment for one month, image observation using a contrast ratio, a test pattern, and visual inspection on a white screen gave a good image, and deterioration of the image due to dust was confirmed. Moreover, it was confirmed by the falling ball test that the fragments did not scatter even when the lens sheet was broken.

Example 7 A lenticular sheet (930 × 700 mm) made of an acrylic resin having a lens pitch of 0.8 mm and an observer side lenticular lens and a convex portion ratio of 52:48 was extruded to form a convex portion. A light shielding layer was formed by printing. A diffusion layer having urethane acrylate as a base material and insoluble acrylic dispersed in a thickness of 80 is formed on one surface of the film.
A PET film (930 × 700 mm) having a thickness of 125 μm, which was formed to a thickness of 4 μm and provided with an adhesive layer made of vinyl chloride and vinyl chloride on the diffusion layer to a thickness of 4 μm, was used for 2 times.
Thermal lamination was performed on the lenticular lens sheet at a temperature of 00 ° C. and 3 m / min to obtain a transmissive screen in which a transparent film was adhered only to the convex portions formed in the non-transmissive portion of the light source light. It was confirmed that the obtained transmissive screen had a wide angle of view, high resolution, and improved color shift. Furthermore, the diffuse reflection of outside light was eliminated and whitish was suppressed, and the glossiness of the image was faithfully reproduced.

Example 8 A lenticular sheet (930) having a lens pitch of 0.8 mm, an observer-side lenticular lens, and a diffusing agent-free acrylic resin having a convex portion ratio of 38:62.
(× 700 mm) was extruded, and a light-shielding layer in which carbon particles were dispersed in vinyl chloride was formed on the convex portion by printing. A diffusion layer having urethane acrylate as a base material and insoluble acryl dispersed therein is formed on one surface to a thickness of 120.
PET film (930 x 700 mm) formed with μm
Is thermally laminated on a lenticular lens sheet at 200 ° C. and a speed of 3 m / min using a thermal transfer roll, and a transparent film is adhered only to the convex portion formed in the non-transmissive portion of the light source. Got the screen.

The obtained transmissive screen has a wide angle of view,
It was confirmed that the resolution was high and the color shift was improved. Furthermore, the contrast was improved, the diffuse reflection of external light was eliminated, and the whitish was suppressed, and the glossiness of the image was faithfully reproduced.

Example 9 A lenticular sheet (930 × 700 mm) made of an acrylic resin having a lens pitch of 0.8 mm and a lenticular lens on the observer side and a convex portion of 50:50 was extruded to form a convex portion. On the other hand, a vinyl chloride vinyl acetate resin layer in which carbon particles were dispersed was formed by offset printing to a thickness of 4 μm to prepare a light-shielding layer. . Further, on one surface of the film, a PET film was formed in which a diffusion layer having urethane acrylate as a base material and insoluble acrylic dispersed therein was formed in a thickness of 20 μm and a width of 0.4 mm in parallel at 0.4 mm intervals. This transparent film is adhered to the lenticular lens sheet by heat lamination using a thermal transfer roll at a temperature of 200 ° C. and a speed of 3 m / min so that the diffusion layer is arranged between the convex portions 5, and the light source light is used. A transparent screen was obtained in which the transparent film was adhered only to the convex portions formed on the non-transmissive portion. It was confirmed that the obtained transmissive screen had a wide angle of view, high resolution, and improved color shift. Furthermore, contrast is improved, diffuse reflection of external light is eliminated and whitish is suppressed,
The glossiness of the image was faithfully reproduced.

Example 10 A lenticular sheet (930 × 700 mm) made of an acrylic resin having a lens pitch of 0.8 mm and an observer side lenticular lens and a convex portion ratio of 52:48 was extruded to form a convex portion. A light shielding layer was formed by printing. On the other hand, a diffusion layer containing urethane acrylate as a base material and insoluble acrylic dispersed in a thickness of 80μ is formed on one surface of the film.
m, and an adhesive layer made of vinyl chloride and vinyl chloride is formed on the diffusion layer.
A PET film (930 × 700) having a thickness of 125 μm, which was colored to have a maximum transmittance near 450 nm and a minimum transmittance near 570 nm.
mm) was produced. This transparent film was thermally laminated on a lenticular lens sheet at 200 ° C. and a speed of 3 m / min using a heat transfer roll, and the transparent film was adhered only to the convex portion formed in the non-transmissive portion of the light source. I got a mold screen. It was confirmed that the obtained transmissive screen had a wide angle of view, high resolution, and improved color shift. Furthermore, contrast is improved, diffuse reflection of external light is eliminated and whitish is suppressed,
The glossiness of the image was faithfully reproduced.

Example 11 An aqueous solution containing 2% by weight of a cationic antistatic agent (Electrostripper QN: manufactured by Kao) was previously applied to the light emitting surface with a spray gun and air-dried to perform antistatic treatment, and the light-shielding layer was formed on the convex portion. The lens pitch printed on is 0.8m
m, the ratio of the lenticular lens on the observer side to the convex portion is 5
A lenticular sheet ((930 × 700 mm) made of acrylic resin of 2:48 was molded. On the other hand, an aqueous solution containing 2% by weight of a cationic antistatic agent (Electrostripper QN: manufactured by Kao) was formed on the light emitting surface side of the film. Applying with a spray gun, air-drying and antistatic treatment, forming a diffusion layer with a thickness of 80 μm in which urethane acrylate as a base material and insoluble acrylic is dispersed on the light-incident surface.
A PET film (930 × 7) having a thickness of 125 μm in which an adhesive layer made of vinyl chloride and vinyl chloride was provided on the diffusion layer to a thickness of 4 μm.
00 mm) was produced. This lenticular sheet and film were heated at 200 ° C. for 3 m / mi using a thermal transfer roll.
Thermal lamination was performed on the lenticular lens sheet at a speed of n to obtain a transmissive screen in which the transparent film was adhered only to the convex portion formed in the non-transmissive portion of the light from the light source.

The surface specific resistance value of the film surface of the obtained screen was measured by a method according to JIS K6911 and found to be 2.5 × 10 ¹⁰ Ω. This screen was left in a normal environment for one month, and when a contrast ratio, image observation using a test pattern, and visual inspection on a white screen were performed, a good image was obtained, and deterioration of the image due to dust and dust was confirmed. There wasn't. In addition, it was confirmed that the obtained transparent screen has a wide angle of view, high resolution, and improved color shift. Furthermore, diffuse reflection of external light is eliminated and whitish is suppressed, resulting in a glossy image. It was faithfully reproduced.

Example 12 A lenticular lens sheet (930 × 700 m) made of an acrylic resin having a lens pitch of 0.8 mm, a viewer side lenticular lens and a convex portion having a ratio of 50:50.
m) was extruded and a light-shielding layer was formed on the convex portion by printing. On the other hand, on one surface of the film, a diffusion layer having urethane acrylate as a base material and insoluble acrylic particles dispersed therein was formed with a thickness of 20 μm and a width of 0.4 mm in parallel at 0.4 mm intervals. A 125 μm-thick PET film 7 having a 4 μm-thick vinyl chloride adhesive layer 10 provided on the entire surface was heated to 200 ° C. by a thermal transfer roll.
Thermal lamination was performed at a speed of 3 m / min to obtain a transmissive screen in which a transparent film was adhered only to the non-transmissive portion of the light from the light source. It was confirmed that the obtained transmissive screen had a wide angle of view, high resolution, and improved color shift. Furthermore, diffuse reflection of outside light was eliminated, whitishness was suppressed, and the glossiness of the image was faithfully reproduced.

[0083]

As described above, according to the first aspect of the present invention, the film is adhered at the portion of the front surface of the lens sheet, which is the most observing side, from which the light source light does not pass, so that the lens sheet is not scratched. It is possible to obtain a transmission screen that is hard to stick and has a scattering prevention property at low cost. Further, by using the film, it becomes possible to easily add functions such as antireflection, antistatic and external light absorption to the screen.

When the lens sheet is continuously formed by extrusion molding or the like, the film can be continuously adhered to the formed lens sheet, so that the production efficiency is high and the production cost can be reduced.

According to the second invention of the present application, in addition to the effect of the first invention of the present application, by providing the convex portion in the non-transmissive portion on the front surface of the lens sheet, it is easy to bond the film to the lens sheet. become.

According to the third invention of the present application, in addition to the effect of the second invention of the present application, even a lens sheet having an observer-side lens portion is protected while maintaining the design of the lens portion. be able to.

According to the fourth invention of the present application, it is possible to selectively adhere to the convex portion of the non-transmissive portion on the front surface of the lens sheet by simply sticking the film on which the adhesive layer is already provided to the lens sheet. Becomes easy.

According to the fifth aspect of the present invention, the first to fourth aspects of the present invention
In addition to the above effect, since the light shielding layer is formed on the front surface of the lens sheet and the film is adhered on the light shielding layer, it is possible to obtain a transmissive screen with less reflection of external light and improved contrast. it can.

According to the sixth invention of the present application, since the black adhesive layer functions as a light-shielding layer, in addition to the effects of the first to third inventions of the present application, the reflection of external light is small and the contrast is improved. It is possible to obtain a transparent screen that
Since the step of forming the light shielding layer and the step of forming the adhesive layer can be performed at the same time, the manufacturing process is simplified.

According to the seventh invention of the present application, in addition to the effects of the first to sixth inventions, the moisture absorption elongation of the film is selected to be smaller than that of the lens sheet. You can get a blur-free screen.

According to the eighth invention of the present application, in addition to the effects of the first to seventh inventions, since the film itself is protected by providing the hard coat layer on the front surface of the film, the film is hardly scratched. Therefore, it is possible to prevent deterioration of the appearance of the screen.

According to the ninth invention of the present application, in addition to the effects of the first to seventh inventions, by providing the film with the lens pattern for changing the optical characteristics of the transmitted light in the vertical direction,
It is possible to easily change the vertical angle of view,
In addition, a clear image can be observed with less reflection of external light.

According to the tenth invention of the present application, in addition to the effect of the ninth invention, the lens pattern for changing the optical characteristics of the transmitted light in the vertical direction is formed of an ionizing radiation curable resin having a hardness higher than that of the film. In addition, the surface hardness of the film is increased, and a screen in which the lens sheet protecting effect is further enhanced can be obtained.

According to the eleventh aspect of the present invention, the first to tenth aspects are provided.
In addition to the effect of the invention described above, a transmissive screen having good contrast can be easily obtained by subjecting the film to a coloring treatment for absorbing external light.

According to the twelfth invention of the present application, in addition to the effects of the eleventh invention of the present application, a transmissive screen having a brighter image and a high contrast can be obtained.

According to the thirteenth aspect of the present invention, the first to twelfth aspects are provided.
In addition to the effect of the invention, since the antistatic treatment is applied to the front surface of the lens sheet, the film, or both, dust or dirt adhering to the front surface of the film and the space between the light emitting portion of the lens sheet enter. It is possible to prevent a decrease in transmittance and a deterioration in appearance due to dust.

According to the fourteenth aspect of the present invention, the first to thirteenth aspects are provided.
In addition to the effect of the invention, since the lens sheet is formed of acrylic having impact resistance and the film is further adhered, it is possible to obtain a transmissive screen having a significantly improved strength as compared with a normal screen.

According to the fifteenth invention of the present application, a transparent film having a diffusing portion on the back surface is adhered to the observation surface side of the lens sheet arranged closest to the observer at the non-light emitting surface of the lens sheet, thereby forming a lens. The diffusing agent of the sheet can be reduced, and a screen can be obtained in which light loss due to diffusion of light from the light source in the lens sheet and reduction in resolution are suppressed. Further, since the diffusing agent is present at a high density on the back surface of the film, it is possible to obtain a screen with improved color shift. Furthermore, since the film is attached to the surface of the lens sheet closest to the observer, the screen surface becomes a mirror surface, the diffuse reflection of external light is eliminated, whitish is suppressed, and a glossy image can be faithfully reproduced.

According to the sixteenth invention of the present application, since the lens sheet does not contain a diffusing agent, it is possible to completely suppress the loss due to the diffusion of light in the lens sheet and the deterioration of the resolution. The area can be increased, and the resolution and contrast are improved.

Further, according to the seventeenth invention of the present application, the area of the diffusion part is reduced as compared with the case where the entire back surface of the transparent film is a diffusion layer by limiting the light diffusion part to the light emission part other than the non-transmission part. As a result, irregular reflection of external light is reduced, and the amount of light absorbed by the light shielding layer is increased, so that both appearance and contrast are improved.

[Brief description of drawings]

FIG. 1 is a perspective view illustrating a first embodiment of the present invention.

FIG. 2 is a cross sectional view illustrating a second embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating another example of the present invention.

FIG. 4 is a transverse sectional view illustrating a third embodiment of the present invention.

FIG. 5 is a perspective view illustrating a fourth embodiment of the present invention.

FIG. 6 is a transverse sectional view illustrating a fifth embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a conventional transmissive screen.

FIG. 8 is a perspective view illustrating a sixth embodiment of the present invention.

9 is a cross-sectional view of FIG.

FIG. 10 is a transverse sectional view illustrating a seventh embodiment of the present invention.

FIG. 11 is a transverse sectional view illustrating an eighth embodiment of the present invention.

FIG. 12 is a transverse sectional view for explaining a ninth embodiment of the present invention.

FIG. 13 is a transverse sectional view illustrating a tenth embodiment of the present invention.

FIG. 14 is a transverse sectional view for explaining an eleventh embodiment of the present invention.

FIG. 15 is an enlarged cross-sectional view showing an example of a light diffusing portion in a transparent film.

FIG. 16 is also an enlarged cross-sectional view showing another example of the arrangement of the light diffusing section.

FIG. 17 is also an enlarged cross-sectional view showing another example of the light diffusing unit.

FIG. 18 is a cross-sectional view showing an example of a conventional transmission screen.

FIG. 19 is a cross-sectional view showing another example of a conventional transmissive screen.

FIG. 20 is a diagram illustrating a defect when a normal adhesive is used.

FIG. 21 is a perspective view illustrating a conventional transmissive screen having a Fresnel lens sheet.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lens sheet 2 Lenticular lens 3 Light-shielding layer 3'Black adhesive layer 4 Light emitting lens 5 Non-transmissive convex portion 6 Scratch resistant film 7 Transparent film 7'External light absorbing colored film 8 Hard coat layer 9 Non-glare treatment Applied hard coat layer 10 Adhesive layer 11 Vertical diffusion lenticular lens 12 Adhesive 13 Light diffusing part (layer) 13a Light diffusing part 13b Light diffusing part 13c Light diffusing part 14 Diffusing agent 15 Transparent layer

Claims (17)

[Claims] 1. A lens sheet having an optical function of condensing and diffusing light, or a transmissive screen formed by stacking a plurality of lens sheets having different optical functions is arranged on the most observer side. A plurality of lenses that collect light from a light source are provided on the back surface of the lens sheet, and a non-transmissive portion that does not transmit the light source light collected by the plurality of lenses on the front surface of the lens sheet. Is provided, and a transparent film is adhered to the non-transmissive portion. 2. The lens sheet is provided with a convex portion on the non-transparent portion of the front surface, and a transparent film is adhered to the convex portion. Transmissive screen. 3. The transmissive screen according to claim 2, wherein a lens is formed between each of the convex portions. 4. The transmission according to claim 2, wherein the film is adhered by a substantially transparent adhesive layer provided on the light source side surface of the film. Type screen. 5. A light-shielding layer is formed in the non-transmissive portion on the front surface of the lens sheet disposed closest to the observation side, and the film is adhered on the light-shielding layer. The transmissive screen according to claim 1. 6. The transmissive screen according to claim 1, wherein the film is adhered by an adhesive layer exhibiting a black color. 7. The transmission screen according to claim 1, wherein the hygroscopic elongation of the film is smaller than the hygroscopic elongation of the lens sheet. 8. The hard coat layer is provided on the observation side surface of the film.
The transmissive screen according to any one of to 7. 9. A lenticular lens for vertical diffusion, a prism for correcting the optical axis in the vertical direction, or a linear Fresnel lens in which a ridge line for refracting the projected light mainly in the vertical direction extends horizontally is provided on the surface of the film on the observation side. It is provided, The transmissive screen in any one of Claims 1-7 characterized by the above-mentioned. 10. The lenticular lens for vertical diffusion,
Alternatively, a vertical optical axis correcting prism, or a linear Fresnel lens in which a ridgeline that refracts projection light mainly in the vertical direction extends in the horizontal direction is formed of an ionizing radiation curable resin having a hardness higher than that of the film. The transmissive screen according to claim 9. 11. The film according to claim 1, wherein the film is subjected to a coloring treatment for absorbing external light.
The transmissive screen according to any one of 1. 12. The transmissive screen according to claim 11, wherein the film subjected to the coloring treatment has a maximum transmittance in the vicinity of 450 nm and a minimum in the vicinity of 570 nm. 13. An antistatic treatment is applied to a surface of the film on the observer side, both surfaces, the front surface of the lens sheet, or a portion in which any one of these is combined. Item 13. The transmissive screen according to any one of Items 1 to 12. 14. The transmissive screen according to claim 1, wherein the lens sheet is formed of an acrylic resin having impact resistance. 15. A light diffusing portion is provided on the back surface of the transparent film, as claimed in any one of claims 1 to 8 and 11 to 1.
The transmissive screen according to any one of 4 above. 16. The transmissive screen according to claim 15, wherein the lens sheet does not contain a diffusing agent. 17. The transmissive screen according to claim 15, wherein the light diffusing portion is formed only between the non-transmissive portions.