JP2004029777A - Lenticular sheet for transmission type screen - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lenticular sheet having lens sections of a fine pitch adequate for observation of a liquid crystal projection television of high fineness/high image quality. <P>SOLUTION: The lenticular sheet for a transmission type screen consists of the configuration that the lens sections installed with convex cylindrical lenses arranged side by side at a pitch below 0.3 mm are formed of the cured matter of a radiation curing resin on one surface of a transparent base, that striped light shielding patterns are formed in the positions corresponding to the boundaries of the respective cylindrical lenses on the other surface of the base and that a diffusion layer is formed on the patterns. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lenticular sheet constituting a transmissive screen in combination with a Fresnel lens sheet, and is particularly suitable for use in a transmissive liquid crystal display device represented by a single tube type liquid crystal projection television using a liquid crystal projector. A lenticular sheet for a transmission screen.
[0002]
[Prior art]
The transmission screen generally has a configuration in which a Fresnel lens sheet and a lenticular sheet are combined. As shown in FIG. 3, the lenticular lens sheet has convex cylindrical lens surfaces formed on both surfaces, a projection formed on one surface (an image light emission side) of each cylindrical lens, and a projection formed on an upper portion of the projection. In general, the light shielding layer (light-absorbing black stripe) is formed.
[0003]
As described above, the convex cylindrical lens surfaces are formed on the front and back surfaces of the lenticular lens sheet. This is because when the projector (light source) is a three-tube CRT system, the three-color lens is used to correct the misalignment of three colors. Because it is suitable.
[0004]
In recent years, transmissive liquid crystal display devices represented by liquid crystal projection televisions have become widespread, and a transmissive screen suitable for observing the image has been demanded. More specifically, the number of pixels of a liquid crystal projector is increasing with the increase in definition of image quality, and at the same time, a fine pitch of convex cylindrical lenses is required for a lenticular lens sheet. For example, the current pitch of the convex cylindrical lens is about 0.7 mm, but a fine pitch of 0.3 mm or less is required.
[0005]
Since this lenticular lens sheet has a configuration in which convex cylindrical lens surfaces are formed on both sides, it is obtained by performing press molding on a transparent thermoplastic resin sheet or performing double-side molding simultaneously with melt extrusion. That is the current situation. However, with various molding methods for thermoplastic resins, it has been very difficult to make the above fine pitch. The reason for this is that the temperature is non-uniform at the time of cooling after the thermoforming, and the molded product is warped or the heat shrinkage is non-uniform.
[0006]
On the other hand, as a production method suitable for molding a fine pitch lens sheet, various molding methods using an ultraviolet (or electron beam) curable resin are known, and the molding methods exemplified below are exemplified. You.
[0007]
JP-A-61-177215 An ultraviolet curable resin is injected into a gap between a Fresnel mold and a transparent resin plate, and is irradiated with ultraviolet rays to polymerize the transparent resin plate and the transparent resin plate. A Fresnel lens (and a method for producing the same) comprising: an ultraviolet-curable resin having a Fresnel lens surface on the side of an anti-transparent resin plate that is adhered.
[0008]
JP-A-63-134227 An ultraviolet (electron beam) curable resin is applied to a Fresnel mold, and the resin is laminated while defoaming the film, and irradiated with ultraviolet (electron beam) to mold. Thereafter, the film (and resin) is released, and then integrated with the transparent substrate.
[0009]
Most of the molding methods using an ultraviolet (electron beam) curable resin, which are intended to manufacture Fresnel lens sheets having a complicated shape, rather than lenticular lens sheets, are used for transmission screens. At present, no proposal has been made regarding the production of a lenticular sheet having the light-shielding pattern described above.
[0010]
In addition, the lenticular sheet used on the observation side of the existing transmission screen may include a light diffusing material such as SiO 2, Al 2 O 3, CaCO 3 mixed with the lenticular lens sheet or a light diffusing material for widening the viewing angle at the time of observation. A light diffusion layer, such as a diffusion film into which a light diffusion material is kneaded or a diffusion film in which the light diffusion material is mixed with a binder to form a coating material, is applied to the observation surface of the lenticular sheet. In any case, the light-shielding pattern (black stripe) is formed at the position closest to the observation side of the lenticular sheet or on the diffusion layer, and is exposed to the outside and is easily scratched. There is a problem.
[0011]
[Problems to be solved by the invention]
The present invention is suitable for forming a transmissive screen suitable for observation of a high-definition and high-quality liquid crystal projection television, that is, a lens unit having a fine-pitch convex cylindrical lens, and corresponding to the pitch of the lens unit. It is an object of the present invention to provide a lenticular sheet on which a fine pitch light-shielding pattern is formed.
[0012]
[Means for Solving the Problems]
The invention according to claim 1 is
On one surface of the transparent support, a lens portion formed by juxtaposing convex cylindrical lenses formed of a cured product of a radiation-curable resin at a pitch of 0.3 mm or less is formed, and the other surface of the support is formed. A transmission type screen, wherein a stripe-shaped light shielding pattern is provided at a position corresponding to a boundary portion of each cylindrical lens, and further, a light diffusion layer is provided on the observation side of the light shielding pattern. Is a lenticular sheet.
[0013]
The invention described in claim 2 is
The lenticular sheet for a transmission screen according to claim 1, wherein the thickness of the lens portion of the lenticular sheet is in a range of 0.1 mm to 0.2 mm.
[0014]
The invention according to claim 3 is:
The light-shielding pattern is formed on the non-lens portion side of the transparent support, is formed via an ultraviolet-sensitive resin layer having tackiness at the time of non-exposure,
The surface of the ultraviolet-sensitive resin layer is formed by transfer on a portion excluding a non-adhesive portion which is a photosensitive portion based on a condensing action of each cylindrical lens, and is formed by transfer. Lenticular sheet for transmission screens.
[0015]
The invention described in claim 4 is
The lenticular sheet for a transmission screen according to any one of claims 1 to 3, wherein a protective film having an antistatic function is laminated on an observation side of the light diffusion layer of the lenticular sheet. .
[0016]
The invention according to claim 5 is
The lenticular sheet for a transmission screen according to any one of claims 1 to 4, wherein a protective film having an antireflection function is laminated on an observation side of the light diffusion layer of the lenticular sheet. .
[0017]
<Action>
In the lenticular sheet according to the present invention, by using an ultraviolet (electron beam) curable resin, it is possible to make a fine pitch which cannot be realized with a molded article made of a thermoplastic resin, and a lenticular sheet having a fine pitch of up to a minimum pitch of 50 μm. Can be produced.
[0018]
In addition, in the existing lenticular sheet, an inorganic powder such as SiO 2, Al 2 O 3, CaCO 3 is mixed into the lenticular sheet, or a diffusion film into which the powder is kneaded, or the above-mentioned powder is used in order to widen the viewing angle at the time of observation. For example, a diffusion film coated with a paint mixed with a binder is laminated on the surface of a lenticular sheet.
In any case, the light-shielding pattern (black stripe) is formed on the diffusion layer, and has a problem that it is exposed to the outside and is easily damaged. According to the configuration of the present invention, the fine-pitch light-shielding pattern is protected by the diffusion layer, and it is possible to prevent the light-shielding pattern from being damaged.
[0019]
By adopting a configuration in which a film having an antistatic function or an antireflection function is laminated on the diffusion layer, each function is exhibited when the lenticular sheet is used, and the function of protecting the diffusion layer is achieved.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings.
(A) Manufacturing apparatus: see FIG. 2 FIG. 2 shows a continuous manufacturing apparatus for lenticular sheets. This manufacturing apparatus includes a coating device (2) for coating an ultraviolet-curable resin on a support film (1) supplied from a roll, and a lens molding roll (3) having an inverted shape of a lenticular lens on the surface. A pressing roll (3 ′), an ultraviolet irradiation device (4), and a laminating roll pair for laminating an ultraviolet-sensitive resin film (6) supplied from the roll on the opposite side of the support film on which the lenticular lens is formed. (5, 5 ′), an ultraviolet irradiation device (9), a pair of laminating rolls (10, 10 ′) for forming a black transfer layer on the transfer paper (11) supplied from the rolls, and supplied from the rolls. Roll pair (13, 13 ') for laminating a diffusion film (14), and a transparent resin film (16) having an antistatic function or an antireflection function supplied from the roll. This is a configuration in which a pair of laminating rolls (15, 15 ') are provided.
[0021]
(B) Manufacturing method Using the above manufacturing apparatus, a lenticular sheet is manufactured by the following process. As the support film (1), a transparent resin film having ultraviolet transmittance is preferable, and it is more preferable that an ultraviolet-curable resin is easily adhered to the side where the lens portion is formed. As the material, polyethylene terephthalate (PET), polycarbonate (PC), polyvinyl chloride (PVC), or the like is used.
[0022]
The UV curable resin coating device (2) is not particularly limited, but is preferably a coating device such as a doctor blade or a die coat.
The thickness of the UV curable resin applied to one side of the support film (1) varies depending on the shape of the lenticular lens to be formed, but is suitably from 0.1 mm to 0.2 mm. Note that the coating thickness can be adjusted by the viscosity of the resin, the feed speed of the support film, and the like.
[0023]
Next, the support film coated with the ultraviolet curable resin is passed between the pair of lenticular molding rolls (3, 3 ′), and the shape of the lens molding roll (3) is transferred to the ultraviolet curable resin. The resin is cured by ultraviolet irradiation from an ultraviolet irradiation device (4). A lens forming roll (3) having an inverted shape of a lenticular lens formed on the surface is provided by disposing a cut metal mold or a resin mold duplicated from the metal mold by a predetermined method on the roll surface. Can be obtained.
[0024]
Next, a support film on which a lenticular lens made of an ultraviolet-curable resin is formed is supplied to a pair of laminating rolls (5, 5 '), and an ultraviolet light-sensitive material supplied from the roll is provided on the opposite side of the support film from the lens. The resin film (6) is laminated.
[0025]
A method of forming a light-shielding pattern at a position corresponding to a boundary portion of a fine-pitch cylindrical lens has been proposed in Japanese Patent Application No. 7-210723 filed by the present applicant. The above proposal utilizes the difference in the presence or absence of adhesiveness between the exposed portion and the non-exposed portion of the photosensitive resin, and the portion having the adhesiveness of the photosensitive resin layer formed on the back surface by exposure from the lens portion side. Is subjected to a light-shielding process.
[0026]
Also in the present invention, a light-shielding pattern is formed on a flat surface of a lenticular sheet by utilizing the principle proposed above. As the ultraviolet-sensitive resin film (6), it is preferable that an ultraviolet-exposed portion has a non-adhesive property by a reaction, and an unexposed portion has a property of being adhesive. As the above-mentioned ultraviolet-sensitive resin film, for example, a Chromalin film (trade name; manufactured by DuPont) is used, and is passed through a pair of laminating rolls (5, 5 ′) heated to 110 ° C., and the opposite side of the support film to the lens side Laminate to Next, by irradiating ultraviolet rays from an ultraviolet irradiating device (9), a non-adhesive portion / adhesive portion corresponding to the condensing portion / non-condensing portion based on the condensing action of the lenticular lens is formed on the ultraviolet-sensitive resin film. After the protective film on the surface is peeled off from the film (not shown), the film is passed through a pair of laminating rolls (10, 10 '), so that only the adhesive portion is blackened from the transfer paper (11) supplied from the roll. Is transferred to form a light-shielding pattern. For pressure transfer of the light-shielding pattern, for example, a chrominance ink foil (trade name; manufactured by DuPont) is used, and the line width of the light-shielding pattern (black stripe) is adjusted by the exposure amount of ultraviolet light and the film feeding speed. Can be.
[0027]
Next, a diffusion film (14) supplied from a roll is laminated on the entire surface including the light shielding pattern by a pair of laminating rolls (13, 13 '). As the diffusion film (14), for example, YS300 (trade name; manufactured by Somar Kogyo KK) or the like is used, and the lenticular sheet can be laminated at room temperature by performing an adhesive process on the side to be laminated.
[0028]
Finally, a transparent resin film (16) having an antistatic function or an antireflection function is passed through a pair of laminating rolls (15, 15 ') for lamination according to the purpose. As the transparent resin film (16) having an antistatic function, a method of kneading a nonionic, anionic or cationic surfactant into the film, or a method in which the above surfactant is mixed with a binder and applied to the film surface It can be obtained by a method, a method of forming a conductive film by vacuum-depositing a conductivity imparting substance (for example, indium oxide doped with tin oxide) on the film surface, or the like. As the transparent resin film (16) having an anti-reflection function, a non-glare film whose surface is roughened by applying a coating obtained by mixing an inorganic powder such as SiO2, Al2O3 and CaCO3 with a binder and applying the coating to the film surface is used. It can be obtained by laminating. As described above, the lenticular sheet having the configuration shown in the cross-sectional explanatory view of FIG. 1 is manufactured.
[0029]
【The invention's effect】
A lenticular sheet having a precise configuration in which a fine-pitch lens portion suitable for observation of a high-definition and high-quality liquid crystal projection television and having a fine-pitch light-shielding pattern corresponding to the lens portion is provided, A lenticular sheet having a fine pitch of 0.3 mm or less required for a transmission screen for a liquid crystal projection television can be easily produced.
[0030]
[Brief description of the drawings]
FIG. 1 is an explanatory sectional view showing a lenticular sheet of the present invention.
FIG. 2 is an explanatory view showing a continuous manufacturing apparatus for lenticular sheets.
FIG. 3 is an explanatory sectional view showing a conventional lenticular sheet.
[Explanation of symbols]
21 ... Lens part 22 ... Transparent support 23 ... Shading pattern 24 ... Diffusion layer 25 ... Transparent resin film 30 ... Lenticular sheet

Claims (5)

On one surface of the transparent support, a lens portion formed by juxtaposing convex cylindrical lenses formed of a cured product of a radiation-curable resin at a pitch of 0.3 mm or less is formed, and the other surface of the support is formed. A transmission type screen, wherein a stripe-shaped light shielding pattern is provided at a position corresponding to a boundary portion of each cylindrical lens, and further, a light diffusion layer is provided on the observation side of the light shielding pattern. Lenticular sheet. The lenticular sheet for a transmission screen according to claim 1, wherein the thickness of the lens portion of the lenticular sheet is in a range of 0.1 mm to 0.2 mm. The light-shielding pattern is formed on the non-lens portion side of the transparent support, is formed via an ultraviolet-sensitive resin layer having tackiness at the time of non-exposure,
The surface of the ultraviolet-sensitive resin layer is formed by transfer on a portion excluding a non-adhesive portion which is a photosensitive portion based on a condensing action of each cylindrical lens, and is formed by transfer. Lenticular sheet for transmission type screen. The lenticular sheet for a transmission screen according to any one of claims 1 to 3, wherein a protective film having an antistatic function is laminated on an observation side of the light diffusion layer of the lenticular sheet. The lenticular sheet for a transmission screen according to any one of claims 1 to 4, wherein a protective film having an anti-reflection function is laminated on the observation side of the light diffusion layer of the lenticular sheet.

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