JP2003075608A - Lens sheet and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens sheet in which a light shielding pattern is formed without having axial misalignment at the front and rear surfaces and which is to be used for the screen of a pixel type projection television characterized by high definition and high picture quality, and to provide a simple method for manufacturing the sheet. SOLUTION: The lens sheet has a lens part where a plurality of convex lenses are arranged and a light shielding pattern formed in the opposite side to the lens part and in a part where light does not condensed by the convex lenses. In the lens sheet, the light shielding pattern is formed on the layer of a photosetting composition (A) or its hardened material. The photosetting composition (A) consists of 100 parts by mass of (a) a photosetting resin composition having >=30 mN/m surface free energy and 0.01 to 10 parts by mass of (b) a compound having <=25 mN/m surface free energy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission screen for a projection television; a lens sheet used for a shadow mask for an image display device such as a plasma display panel or a liquid crystal display, and a method for manufacturing the same. In particular, it relates to a simple method for forming a light-shielding pattern on a fine-pitch lens sheet of 0.3 mm or less, which is necessary for a pixel-type projection television screen using a liquid crystal panel or the like.

[0002]

2. Description of the Related Art A transmissive screen used in a projection television generally comprises a combination of a Fresnel lens sheet and a lenticular lens sheet. A projection television that uses a CRT as a light engine (hereinafter,
In the case of a CRT projection television), as shown in FIG. 7, the lenticular lens sheet 11 has convex cylindrical lenses 12 and 13 on both sides of emission and incidence of image light.
Is formed, and has a function of correcting the color shift of the three RGB colors by the CRT and a function of enlarging the viewing angle of the image light incident on the lenticular lens sheet from the Fresnel lens sheet.

A convex cylindrical lens 1 having an exit surface
3 is formed with a convex portion 14 at each boundary portion.
A light-shielding pattern 15 having a light absorbing property is formed on the upper part of the. The light-shielding pattern 15 is generally called a black stripe and can prevent reflection of external light from the observer side and improve the contrast of image light emitted from the lenticular lens sheet 11.

The lenticular lens sheet 11 is formed by a method of press-molding a transparent thermoplastic resin sheet, in which the transparent thermoplastic resin sheet is extruded and at the same time a metal mold is passed through to form convex cylindrical lenses 12 and 13 and convex portions 14 on both sides. Method (hereinafter referred to as extrusion molding method)
It is molded by etc. Further, the light-shielding pattern 15 is formed on the formed lenticular lens sheet by selectively printing the light-absorbing colored paint only on the convex portions 14 by using various printing methods such as screen printing and gravure printing. There is.

When the lenticular lens sheet 11 is molded, the convex cylindrical lens 12 on the incident surface,
The alignment of the convex cylindrical lens 13 and the light shielding pattern 15 on the emission surface on both the front and back surfaces is important, and when the axes of both the front and back lenses are not in a positional relationship corresponding to the incident light to the incident side convex lens, the light shielding pattern 15 Blocking the emitted light leads to deterioration of the screen characteristics such as a decrease in the brightness of the emitted light.

The lenticular lens sheet for CRT type projection television is relatively easy to be aligned on the front and back sides by using the above-mentioned press molding method or extrusion molding method, and molding with sufficient screen characteristics is possible. Is. A microlens array sheet in which microlenses are arranged may be used depending on the application. The microlens array sheet has a function of expanding not only the horizontal direction of the projection television but also the vertical viewing angle. Hereinafter, unless otherwise specified, in the present specification, the convex cylindrical lens and the microlens are combined into a “lens”, and the lenticular lens sheet and the microlens array sheet are combined into a “lens sheet”.
I will call it.

In order to achieve high image quality and high definition of an image, a CRT having a large number of pixels is not used as a light engine, but a liquid crystal projection device having a smaller number of pixels, a DMD (digital micromirror device) or the like is written. A projection television as an engine (hereinafter, pixel projection television) is required. However, if a lens sheet for a conventional CRT projection TV is diverted to a pixel projection TV, moire (interference fringes) will occur because the size of the pixels projected on the screen and the lens pitch of the lens sheet are close. There's a problem. Therefore, in a lens sheet for a pixel type projection television, it is necessary to make the pitch of the lens fine so that pixels and moires projected on the screen do not occur, and a fine pitch of 0.3 mm or less is required.

However, in the conventional method of forming the light-shielding portion by printing on the concave portion or the convex portion with respect to the unevenness of the emission surface, it is necessary to shape both surfaces of the lens sheet.
With the press molding method and the extrusion molding method, it is very difficult to mold a fine-pitch lens sheet by double-sided molding. The reason for this is that due to the finer pitch, a lowering of the shaping rate of the lens and axial misalignment on both front and back surfaces are likely to occur.

Therefore, various techniques have been studied in the prior art in which light is irradiated from the lens surface side to expose the photosensitive layer coated on the opposite surface side to provide a light-shielding pattern only in the non-light-irradiated portion. JP-A-59-121033 and JP-A-9-
In JP-A-120101, a positive photosensitive resin layer applied on the opposite side of the lens surface is irradiated with light from the lens side to be cured, and then a powder pigment, a black paint or the like is applied, or a transfer in which a black paint is applied is transferred. Although a method of coloring the adhesive unexposed area to black by attaching a film etc. is disclosed, these methods require a step of removing the pigment or paint on the light collecting section. Since a large amount of the base film used for the film becomes waste, it has problems such as a large environmental load and difficulty in completely removing pigments, paints, etc. from the light collecting part. . Also, Japanese Patent Laid-Open No. 2000-2802
The publication discloses a method of controlling the hydrophilicity of the surface by using a photocatalyst and applying a light-shielding pattern,
According to this method, since the condensing part by the lens becomes hydrophilic, it is necessary to first attach water to the condensing part and then print on the entire surface to remove the ink on the part where the water adheres. However, there is a problem that the process becomes complicated.

[0010]

DISCLOSURE OF THE INVENTION The present invention is applied to a screen for a pixel type projection television characterized by high definition and high image quality, and a lens sheet in which a light-shielding pattern is formed on both front and back sides without axial misalignment, and It is an object to provide a simple manufacturing method thereof.

[0011]

According to the present invention for solving the above-mentioned problems, a lens portion in which a plurality of convex lenses are arranged, and a light-shielding pattern provided on a non-light-condensing portion formed by the convex lenses on a surface opposite to the lens portion are provided. In the lens sheet including, the light-shielding pattern is provided on a layer made of a cured product of the photocurable composition (A), and the photocurable composition (A)
However, 100 parts by mass of the photocurable resin composition (a) having a surface free energy of 30 mN / m or more and a surface free energy of 2
A lens sheet, which is a composition comprising 0.01 to 10 parts by mass of a compound (b) having an amount of 5 mN / m or less.

Further, according to the present invention, in a lens sheet having a lens portion in which a plurality of convex lenses are arranged, and a light shielding pattern provided on a non-light-condensing portion formed by the convex lenses on a surface opposite to the lens portion, the light shielding pattern is provided. Is provided on a layer formed of a cured product of the photocurable composition (A), and the surface free energy of the layer formed of the cured product of the photocurable composition (A) at the light collecting portion by the convex lens is 25 mN. It is a lens sheet characterized by being / m or less.

Further, the present invention is a method for manufacturing a lens sheet, comprising a lens portion in which a plurality of convex lenses are arranged, and a light-shielding pattern provided in a non-light-condensing portion formed by the convex lenses on a surface opposite to the lens portion, Surface free energy is applied to the surface of the lens sheet opposite to the lens portion.
Application of a photocurable composition (A) comprising 100 parts by mass of a photocurable resin composition (a) of 30 mN / m or more and 0.01 to 10 parts by mass of a compound (b) having a surface free energy of 25 mN / m or less. And forming a layer of the photocurable composition (A); a medium in which the layer of the photocurable composition (A) has a surface free energy lower than that of the compound (b). A step of irradiating light from the lens portion side in a contact state to selectively cure the layer made of the photocurable composition (A) in the condensing portion by the convex lens;
A step of forming a light-shielding pattern on a non-light-condensing portion formed by the convex lens by applying a colored paint on the layer made of the photocurable composition (A) after the step, and manufacturing the lens sheet. Is the way.

Further, in the present invention, a step of irradiating light from the lens portion side to selectively cure the layer made of the photocurable composition (A) in the condensing portion by the convex lens and forming a light shielding pattern. During the process, the layer of the photocurable composition (A) is in contact with a medium having a surface free energy higher than the surface free energy of the photocurable resin composition (a), and is opposite to the lens part. The method for producing a lens sheet described above, comprising a step of irradiating light from the side to cure the uncured portion of the layer made of the photocurable composition (A).

Here, the surface free energy value in the present invention is a value at a temperature of 20 ° C. and a relative humidity of 50%, and is measured by the following method.

There are various methods for measuring the surface free energy of a liquid, but in this specification, the value measured by the Wilhelmy method at a temperature of 20 ° C. and a relative humidity of 50% is used as the surface free energy. The measurement principle of the Wilhelmy method is as follows. As shown in FIG. 5, the plate 52 is hung on one side of the balance 51 and one end of the plate 52 is filled with the measurement liquid 53.
The balance 5 with the appropriate load 54 on the other side.
Balance one. At this time, the plate 52 receives downward force from the measurement liquid 53 in addition to gravity and buoyancy, and in the equilibrium state, the following equation (1) is established.

[0017] [Load 54] = [Gravity of plate 52]-[Buoyancy of plate 52] + [Force received from liquid surface] (1)

Since the force received from the liquid surface corresponds to the surface tension (= surface free energy of the liquid), the surface free energy of the liquid can be obtained by measuring the force received from the liquid surface. Although platinum, glass, or the like is used as the material of the plate 52, since the surface free energy is invariable, any material that is not corroded by the measurement liquid 53 may be used. In the measurement of the present specification, platinum is used as the plate 52. Is used.

Although the surface free energy of a solid cannot be directly measured, it can be obtained by using several kinds of liquids whose surface free energy is known. The droplet on the solid surface has a cross-sectional shape as shown in FIG. 6, and the contact angle in the figure is drawn to the liquid 62 at the intersection of the surface of the liquid 62 on the surface of the solid 61 and the surface of the solid 61. Tangent and solid 61
The angle between the surface and the side containing the liquid 62, and its value is θ
And At this time, the following equation (2) (Young's equation) is established due to the equilibrium condition at the intersection.

Γ_S= γ_SL+ Γ_L・ Cos θ (2) Where γ_SIs the surface free energy of the solid, γ_LIs liquid
Surface free energy, γ _SLIs solid / liquid interface free energy
Represents Rugie.

The surface free energy γ is the dispersion force component γ^a,
Polar force component γ^bAnd hydrogen bond component γ ^cRepresented by the sum of
Body / liquid interface free energy γ_SLOf the following formula (3)
The assumption is said to hold.

Γ _SL = γ _S + γ _L -2 (γ _S ^a γ _L ^a ) ^1/2 -2 (γ _S ^b γ _L ^b ) ^1/2 -2 (γ _S ^c γ _L ^c ) ^1/2 ( 3)

Therefore, the temperature of 20 ℃, relative humidity of 50%
3 types with different surface free energies
If the value θ of the contact angle of the above liquid on the solid surface is obtained,
Solving a ternary equation consisting of equations (2) and (3)
And γ_S ^a, Γ_S ^bAnd γ _S ^cCan be calculated and
Surface solid free energy γ_SIs required.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows a schematic view of a lens sheet 1 of the present invention. The lens sheet 1 of the present invention includes a convex lens 2
Photocurable composition (A) on the opposite surface of the lens part where the
Layer 3 and a light-shielding pattern 4, and the surface free energy of the layer 3 made of the photocurable composition (A) in the opening of the light-shielding pattern 4, that is, the light-collecting portion of the convex lens is 25 mN / m or less. Is.

The lens portion in which the convex lens 1 is arranged is
It may be one in which convex cylindrical lens groups are arranged one-dimensionally, or may be a microlens array in which convex lens groups are two-dimensionally arranged. The lens array of the microlens array is preferably an array corresponding to the pixel array of the display device or a close-packed array (so-called “delta array”) from the viewpoint of image light transmittance. The lens sheet of the present invention can be easily molded by a conventional press molding method using a transparent thermoplastic resin, an extrusion molding method and the like, and a 2P method using an ionizing radiation curable resin.

In the present invention, as the photocurable composition (A), a composition comprising a photocurable resin composition (a) described later and a compound (b) having a low surface free energy described later is used. The surface free energy of the photocurable resin composition (a) used for solving the problems of the present application is 30 mN / m or more, preferably 40 mN / m or more. The surface free energy of the compound (b) is 25 mN / m or less, preferably 20 mN / m or less. Moreover, in order to solve the subject of this application, 0.01-10 mass parts of compounds (b) are mixed with 100 mass parts of photocurable resin compositions (a), and are 0.1 mass part or more. It is preferable to mix 8 parts by mass or less.

The present inventors cured the photocurable composition (A) comprising the above-mentioned photocurable resin composition (a) and compound (b) by irradiating it with light in a medium having a low surface free energy. By doing so, it was found that a surface having a low surface free energy can be obtained, and a surface having a high surface free energy can be obtained by curing by irradiating light in a medium having a high surface free energy. Also,
It was found that in the uncured state, the surface free energy of the photocurable composition (A) depends on the medium in contact with it. Examples of the light to be irradiated here include visible light and ultraviolet light, and ultraviolet light having high energy advantageous for curing the photocurable composition (A) is preferable.

The above surface modification phenomenon is presumed to be caused by the following mechanism. The interface between the composition comprising the photocurable resin composition (a) and the compound (b) and the medium is energetically stable when the difference between the surface free energies of the two becomes minimum. Since the compound (b) in the photosensitive composition (A) has a lower surface free energy than the photocurable resin composition (a), the compound (b) exists at the interface in the state of being in contact with a medium having a low surface free energy. By doing so, a stable state is achieved. On the other hand, when the photocurable resin composition (a) is present at the interface in the state of being in contact with a medium having a high surface free energy, the photocurable resin composition (a) is more energetically stable than the compound (b) is present at the interface. The compound (b) disappears from the interface. That is,
If the photocurable resin composition (a) is in an uncured state, phase transition will occur depending on the medium. Therefore,
Surfaces having different surface free energies can be obtained by irradiating the photocurable composition (A) with light in a medium having different surface free energies to fix the state at the interface.

Further, since the above phase transition is reversible when the photocurable composition (A) is in an uncured state, the photocurable composition (A) is divided into a region having a high surface free energy and a region having a low surface free energy. In the case of surface modification, it is possible to selectively modify the surface free energy to a high area and then the remaining surface to a low surface free energy. It is also possible to modify it to a region having a low surface energy and then modifying the rest to a region having a high surface free energy.

As a medium having high surface free energy,
Water; examples include higher alcohols such as glycerin. Examples of the medium having a low surface free energy include the atmosphere; inert gases such as helium gas and argon gas; however, the medium is not limited to these. Particularly, in the present invention, it is possible to use water as a medium having a high surface free energy and atmospheric air as a medium having a low surface free energy. Therefore, the present invention is significant in terms of cost and environment.

The compound (b) having a surface free energy of 25 mN / m or less used in the present invention is a silicone oil such as polydimethylsiloxane, and the side chain or terminal of the silicone oil is modified with an amino group, an epoxy group or the like. Modified silicone oil, tetramethoxysilane, phenyltrimethoxysilane, and other alkoxysilanes and other silicon-containing (polymer) compounds; fluoroalkylsilanes, fluoroalkyl groups and other fluorine-containing polymer compounds, etc. Molecule) compound; a block copolymer, a graft copolymer, a random copolymer, etc. containing the above compound as a component can be mentioned, but the compound is not limited to the above compound.

The photocurable resin composition (a) used in the present invention comprises a polymerizable monomer and, if desired, other components such as a photopolymerization initiator (provided that the surface free energy is 25 mN / Compounds (b) that are less than or equal to m are included. The polymerizable monomer is a photopolymerizable compound, has a surface free energy of 30 mN / m or more, and has at least one ethylene double bond in the molecule, and is photopolymerizable ethylenically unsaturated. The compounds can generally be used,
If necessary, a photocationically polymerizable epoxy-based or oxetane-based compound or the like may be further added.

Examples of the photopolymerizable ethylenically unsaturated compound that can be used in the practice of the present invention include (meth) acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate and n-butyl ( (Meth) acrylate, t-butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, benzyl (meth) acrylate, glycidyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, 2-hydroxyethyl (meth) acrylate and the like. Monofunctional (meth) acrylate-based monomer; N-vinylpyrrolidone, N-vinylimidazole, N-vinylcaprolactam, styrene, α-methylstyrene, vinyltoluene, allyl acetate, vinyl acetate, vinyl propionate,
Vinyl-based monomers such as vinyl benzoate; and 1,4
-Butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, 1,9-nonanediol di (meth) acrylate, ethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, etc. Bifunctional (meth) acrylate monomer; trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, pentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate. , Tri (meth) acryloyl cyanurate, tri (meth) acryloyl isocyanurate, triallyl cyanurate, triallyl isocyanurate, 1,3,5-tri (meth) acrylo Such as polyfunctional (meth) acrylate monomers such as Ruhekisahidoro -s- hydrazine and the like, one or more of these are used. In the names of the above compounds, "(meth) acrylic acid" is a generic term for "acrylic acid" and "methacrylic acid", "(meth) acrylate" is a generic term for "acrylate" and "methacrylate", and “(Meth) acryloyl” is a general term for “acryloyl” and “methacryloyl”.

If necessary, a photopolymerization initiator may be added. Specific examples of the photopolymerization initiator include 2,2-dimethoxy-2-phenylacetone, acetophenone, benzophenone, xanthfluorenone, benzaldehyde, anthraquinone, 1- (4-isopropylphenyl).
2-hydroxy-2-methylpropan-1-one, 1
-Hydroxy-cyclohexyl-phenyl-ketone,
2,4-diethylthioxanthone, camphorquinone,
2-Methyl-1- [4- (methylthio) phenyl] -2-
Examples thereof include morpholinopropan-1-one.

In some cases, as a diluent for the photocurable composition (A), acetone, ethanol, methanol, isopropyl alcohol, hexane, ethyl acetate, chloroform, carbon tetrachloride, tetrahydrofuran, tetrahydrofuran,
An organic solvent such as diethyl ether, methyl ethyl ketone, toluene or benzene may be used.

The lens sheet of the present invention is applied to a transmission screen for a projection television; a shadow mask for a pixel type flat panel display such as a plasma display panel or a liquid crystal panel. The shape of the lens sheet base material may have an uneven surface or a curved surface on the exit surface like a lens sheet for a CRT projection television, or when a liquid crystal projection device is used as a light engine, color shift of three RGB colors Since there is no need to correct the
It is not necessary to provide a lens on the exit surface of the image light as shown in, and the lens 12 may be provided only on the entrance surface and the exit surface may be flat.

The lens sheet of the present invention can be manufactured by the method described below. First, as shown in FIG. 1, the exit surface of the lens sheet 1 is coated with the above-mentioned photocurable composition (A), and a medium having a lower surface free energy than the compound (b) from the convex lens 2 side (for example, the atmosphere) ) And irradiate with light. The irradiated light is condensed by the convex lens 2, and only the photocurable composition (A) in the condensing part is selectively cured (vertical stripes in the figure). From the above, it is possible to obtain a lens sheet in which the surface energy of the light collecting portion is 25 mN / m or less. At this time, it is preferable that the light emitted from the lens portion side has traveling directions that are substantially parallel to each other. Light having a substantially parallel traveling direction can be obtained by collimating the light emitted from a light source that can be regarded as a point light source with a collimator lens, or by scanning the light obtained by a double slit or a double pinhole. Can be reproduced. In the case where the lens sheet is a lens sheet for a transmissive screen used in an image display device that projects and displays an image from the back surface, the light emitted from the lens unit side travels approximately equivalent to the projected light of the image. It is preferable to have a direction. Light having a traveling direction substantially equivalent to the projected light of an image can be obtained by a projection system equivalent to the projection system used in the image display device.

Next, as shown in FIG. 2A, the obtained lens sheet 1 is in contact with a medium (for example, water) having a surface free energy higher than that of the photocurable resin composition (a), By irradiating light from the exit surface side of the lens sheet 1, only the uncured photocurable composition (A) is cured (horizontal stripes in the figure).

By the steps described above, the light condensing portion and the non-light condensing portion of the exit surface of the lens sheet 1 can be surface-modified into a region having low surface free energy and a region having high surface free energy, respectively. At this time, it is preferable that the surface free energy of the non-light-collecting part is higher than the surface free energy of the light-collecting part by 5 mN / m or more from the viewpoint of the formability of the light shielding pattern 4.

The wettability of various liquids is different on the surface having different surface free energy, and in the case of commonly used solvents and paints, the surface having high surface free energy is more easily wetted by the liquid than the surface having low surface free energy. . Therefore, in the surface-modified lens sheet 1, the non-light-collecting portion is more easily wet with various liquids than the light-collecting portion. By utilizing this property and applying the color paint to the surface-modified lens sheet 1, it becomes possible to form the light-shielding pattern 4 to which the color paint adheres only to the non-light-collecting portion (FIG. 2).
(Shown in (b)).

Further, as shown in FIG. 1, the lens sheet 1
The above-mentioned photocurable composition (A) is applied to the exit surface of, and the convex lens 2 side is irradiated with light in a state of being in contact with a medium having a lower surface free energy than the compound (b) (for example, the atmosphere),
It is also possible to selectively cure only the photocurable composition (A) in the light collecting portion (vertical stripes in the figure), and then apply a coloring paint as shown in FIG. 3 to form the light shielding pattern 4. It is also possible to cure the colored paint after applying the colored paint, and then irradiate light from the colored paint side to cure the uncured photocurable composition (A).

In the above case, the colored coating material applied on the layer 3 made of the photocurable composition (A) having a low surface free energy of the light collecting portion (25 mN / m or less) is repelled. The light-shielding pattern 4 can be formed by curing the colored coating material after the layer 3 made of the photocurable composition (A) is substantially completely exposed. Here, the state in which the layer 3 made of the photocurable composition (A) is substantially completely exposed is such that the objective of the lens sheet 1 to be obtained is sufficiently achieved. This is a state in which the colored paint is removed from the layer 3 made of.

When using a highly viscous colored paint,
As described above, the repelling of the colored paint in the light collecting portion may be used, but it takes time to completely repel the colored paint having high viscosity because of low fluidity. In this case, as shown in FIG. 4 (a), after the high-viscosity colored paint is applied to the cured surface of the layer 3 made of the photocurable composition (A), the adhesion with the colored paint is good. After the base material 5 is brought into close contact with the colored paint, the colored paint is cured, and as shown in FIG. 4B, the light shielding pattern 4 may be formed by removing only the colored paint in the light collecting portion. Alternatively, only the colored paint on the light collecting portion may be removed by a physical method such as air flow, water flow, or blast. In these cases, the step of removing the colored paint is not omitted, but since the adhesive strength of the colored paint in the light collecting portion is low, the colored paint can be easily removed even after curing,
Workability can be improved.

Examples of the colored coating material used in the present invention include gravure ink, flexographic ink, screen ink, offset ink and letterpress ink. From the viewpoint of improving the contrast, the colored paint is preferably a black paint. The colored paint is at least 1 selected from fats and oils components such as dry oils and non-drying oils; resin components such as synthetic resins and natural resins; solvent components such as hydrocarbons, ketones and alcohols.
Or a mixture of a photopolymerizable monomer and a photopolymerization initiator, and a colorant. The colorant may be a black dye such as aniline black; carbon black, acetylene black, lamp black, mineral black, or the like. Black pigments and the like are included.

When the photocurable colored coating material is used in the present invention, the light shielding pattern can be formed by the following treatment. First, a photocurable colored coating material is applied to a release sheet with a predetermined film thickness, and the lens condensing portion is bonded to a lens sheet whose surface is modified to have a low surface free energy. At this time, the non-light-collecting portion of the lens may be surface-modified into a region having high surface free energy or may be untreated. Then, by irradiating substantially parallel light again from the lens portion side, only the photocurable colored coating material of the light condensing portion is cured. Finally, the lens sheet on which the light-shielding pattern is formed can be obtained by separating the release sheet and the lens sheet.

[0046]

EXAMPLES The present invention will be specifically described below with reference to examples.

Example 1 A lenticular lens sheet was obtained by 2P molding using a lens forming roll having an inverted shape of a lenticular lens formed by arranging convex cylindrical lenses having a pitch of 0.3 mm in parallel. At this time, as a base film, a 0.25 mm thick polyethylene terephthalate film (Cosmo Shine A4300) manufactured by Toyobo Co., Ltd.,
Acrylic UV curable resin (Aronix) manufactured by Toagosei Co., Ltd. was used as the 2P resin.

60 parts by mass of dipentaerythritol hexaacrylate (KAYARAD DPHA) manufactured by Nippon Kayaku Co., Ltd., 40 parts by mass of isocyanuric acid ethylene oxide modified triacrylate (Aronix M-315) manufactured by Toagosei Co., Ltd., Nippon Kayaku Co., Ltd. 1 part by mass of 2,4-diethylthioxanthone manufactured by Ciba Specialty Chemicals Co., Ltd. 2-methyl-1- [4- (methylthio) phenyl] -2
-Morpholinopropan-1-one (Irgacure 907) 3
A photocurable resin composition (a) was prepared by mixing in a proportion of parts by mass. When the surface free energy of the photocurable resin composition (a) was measured by the Wilhelmy method, it was 42.6 mN.
It was / m. Amino-modified silicone oil (KF85 manufactured by Shin-Etsu Chemical Co., Ltd.) having a surface free energy measured by the Wilhelmy method of 20.7 mN / m as a compound (b) having a low surface free energy in the photocurable resin composition (a).
0.5 part by mass of 7) was added to obtain a photocurable composition (A). Since the photocurable composition (A) has a high viscosity and is difficult to handle in view of coatability, it was diluted with toluene so that the concentration of the photocurable composition (A) was 5%.

The diluted photocurable composition (A) was applied to a polyethylene terephthalate (PET) film by a bar coater for 0.02 mm, and then toluene was volatilized to obtain a uniform thickness of 0.001 mm on the PET film. A film coated with the photocurable composition (A) could be obtained. The obtained film was divided into two parts, one of which was exposed to ultraviolet light by a high pressure mercury lamp in the air and the other in water. The contact angle with various solvents was measured on the surface of the obtained film using a contact angle meter manufactured by Kyowa Interface Science Co., Ltd. The results are shown in Table 1.

[0050]

[Table 1]

From the results shown in Table 1, the surface free energies when cured in air and in water were calculated to be 21.5 mN / m and 40.2 mN / m, respectively. It can be seen that a surface with a different surface free energy than that obtained when cured in was obtained.

The photocurable composition (A) diluted with toluene was coated on the flat surface of the lenticular lens sheet with a micro gravure coater to a thickness of 0.02 mm, and 120 ° C.
The toluene was volatilized by drying for 5 minutes, and the coating thickness of the photocurable composition (A) was adjusted to 0.001 mm. The lenticular lens sheet was irradiated with substantially parallel ultraviolet light from a convex cylindrical lens side by a high pressure mercury lamp in a nitrogen atmosphere. Further, while the lenticular lens sheet was immersed in water, ultraviolet light was irradiated from a flat surface side of the lenticular lens sheet by a high pressure mercury lamp.

On the flat surface side of the obtained lenticular lens sheet, PS (pre-sensitive) manufactured by Toyo Ink Mfg. Co., Ltd.
A polyethylene terephthalate film substrate coated with a 0.003 mm thick UV curable ink for plate offset printing (FD Carton ink) was laminated. Ultraviolet light is radiated from a polyethylene terephthalate film base material by a high-pressure mercury lamp, the PS plate offset printing UV curable ink is dried, and then the polyethylene terephthalate film base material is peeled off. It was possible to form a light-shielding pattern on both the front and back sides by removing the axis without misalignment. When the lenticular lens sheet on which the light-shielding pattern was formed was installed in the liquid crystal projection television, it was possible to observe a good image.

(Example 2) A microlens array sheet was obtained by 2P molding using a lens molding roll in which microlenses having a pitch of 0.15 mm were arranged and in which an inverse shape of the microlenses was formed. At this time, a 0.125 mm-thick polyethylene terephthalate film (Cosmoshine A4300) manufactured by Toyobo Co., Ltd. was used as the base material film, and an acrylate-based UV curable resin (Aronix) manufactured by Toagosei Co., Ltd. was used as the 2P resin.

100 parts by mass of pentaerythritol triacrylate (Aronix M-305) manufactured by Toagosei Co., Ltd., 1-hydroxy-cyclohexyl-phenyl-ketone (Irgacure 18 manufactured by Ciba Specialty Chemicals Co., Ltd.)
4) Photocurable resin composition (a) mixed at a ratio of 3 parts by mass
Was prepared. The surface free energy of the photocurable resin composition (a) was measured by the Wilhelmy method.
It was 6.8 mN / m. Fluorine-based block copolymer (Modiper F200) manufactured by NOF CORPORATION whose surface free energy measured by the Wilhelmy method is 18.6 mN / m as the compound (b) having a low surface free energy in the photocurable resin composition (a). 1 part by weight of photocurable composition (A)
And Since the photocurable composition (A) has a high viscosity and is difficult to handle in view of coatability, it was diluted with methyl ethyl ketone so that the concentration of the photocurable composition (A) was 10%.

The diluted photocurable composition (A) was applied to a thickness of 12
After coating 0.01mm on a 5μm PET film with a bar coater, volatilize methyl ethyl ketone to obtain PE.
A film in which the photocurable composition (A) having a thickness of 0.001 mm was uniformly applied on the T film could be obtained. After curing this in the same manner as in Example 1, the surface free energy was calculated to be 20.3 mN / m for curing in air and 52.3 mN / m for curing in water.

The photocurable composition (A) diluted with methyl ethyl ketone on the flat surface of the microlens array sheet.
Was coated with a microgravure coater to a thickness of 0.03 mm, and methyl ethyl ketone was volatilized by drying at 80 ° C. for 5 minutes to give a coating thickness of the photocurable composition (A) of 0.003 mm. The microlens array sheet was irradiated with substantially parallel ultraviolet light from the microlens side in the atmosphere by a high pressure mercury lamp.

A 0.01 mm thick UV curable ink (UVPAL911) for screen printing manufactured by Teikoku Ink Co., Ltd. was applied to the flat surface side of the obtained microlens array sheet. The UV curable ink for screen printing is repelled on the light collecting portion to expose the layer made of the photocurable composition (A), and the UV curable ink for screen printing adheres only to the portion other than the light collecting portion. After a sufficient time had passed, the UV curable ink for screen printing was dried with a high pressure mercury lamp, and a light-shielding pattern could be formed on both the front and back sides without axis misalignment. When a microlens array sheet with a light-shielding pattern was installed on a liquid crystal projection TV, it was possible to observe a good image not only in the horizontal direction but also in the vertical viewing angle. there were.

(Example 3) A lenticular lens sheet was obtained by 2P molding using a lens forming roll having an inverted shape of a lenticular lens formed by arranging convex cylindrical lenses having a pitch of 0.3 mm in parallel. At this time, a 0.25 mm thick polyethylene terephthalate film (Cosmoshine A430 manufactured by Toyobo Co., Ltd. was used as the base film.
0), an acrylate-based UV curable resin (Aronix) manufactured by Toagosei Co., Ltd. was used as the photocurable resin.

60 parts by mass of dipentaerythritol hexaacrylate (KAYARAD DPHA) manufactured by Nippon Kayaku Co., Ltd., 40 parts by mass of isocyanuric acid ethylene oxide modified triacrylate (Aronix M-315) manufactured by Toagosei Co., Ltd., Nippon Kayaku Co., Ltd. 1 part by mass of 2,4-diethylthioxanthone manufactured by Ciba Specialty Chemicals Co., Ltd. 2-methyl-1- [4- (methylthio) phenyl] -2
-Morpholinopropan-1-one (Irgacure 907) 3
A photocurable resin composition (a) was prepared by mixing in a proportion of parts by mass. When the surface free energy of the photocurable resin composition (a) was measured by the Wilhelmy method, it was 42.6 mN.
It was / m. Amino-modified silicone oil (KF85 manufactured by Shin-Etsu Chemical Co., Ltd.) having a surface free energy measured by the Wilhelmy method of 20.7 mN / m as a compound (b) having a low surface free energy in the photocurable resin composition (a).
0.5 part by mass of 7) was added to obtain a photocurable composition (A). Since the photocurable composition (A) has a high viscosity and is difficult to handle in view of coatability, it was diluted with toluene so that the concentration of the photocurable composition (A) was 5%.

The photocurable composition (A) diluted with toluene was coated on the flat surface of the lenticular lens sheet with a microgravure coater to a thickness of 0.02 mm, and the temperature was 120 ° C.
The toluene was volatilized by drying for 5 minutes, and the coating thickness of the photocurable composition (A) was adjusted to 0.001 mm.

The above lenticular lens sheet was irradiated with substantially parallel ultraviolet light from a convex cylindrical lens side in a nitrogen atmosphere from a high pressure mercury lamp. Further, while the lenticular lens sheet was immersed in water, ultraviolet light was irradiated from a flat surface side of the lenticular lens sheet by a high pressure mercury lamp.

On the flat surface side of the obtained lenticular lens sheet, PS plate offset printing manufactured by Toyo Ink Mfg. Co., Ltd.
A UV curable ink (FD Carton ink) was applied to a thickness of 0.003 mm. The UV curable ink for screen printing is repelled on the light collecting portion to expose the layer made of the photocurable composition (A), and the UV curable ink for screen printing adheres only to the portion other than the light collecting portion. After a sufficient time had passed, the UV curable ink for screen printing was dried with a high pressure mercury lamp, and a light-shielding pattern could be formed on both the front and back sides without axis misalignment. When the lenticular lens sheet on which the light-shielding pattern was formed was installed in the liquid crystal projection television, it was possible to observe a good image.

(Embodiment 4) A lenticular roll is formed by extrusion molding of a methyl methacrylate-styrene copolymer resin using a lens forming roll having an inverted shape of a lenticular lens in which convex cylindrical lenses having a pitch of 0.15 mm are juxtaposed. I got a lens sheet.

70 parts by mass of pentaerythritol triacrylate (Aronix M-305) manufactured by Toagosei Co., Ltd., 20 parts by mass of epoxy-modified hexanediol diacrylate (KAYARAD R-167) manufactured by Nippon Kayaku Co., Ltd., Acyl manufactured by BASF Corporation Phosphine oxide (LUCIRIN T
PO) was mixed at a ratio of 10 parts by mass to prepare a photocurable resin composition (a). The surface free energy of the photocurable resin composition (a) was measured by the Wilhelmy method and found to be 45.8 mN / m. The photocurable resin composition (a) has a surface free energy of 18.6 mN / m measured by the Wilhelmy method as a compound (b) having a low surface free energy.
DAIKIN INDUSTRIAL CO., LTD. Water repellent (TG656) 8
A part by mass was added to obtain a photocurable composition (A). Since the photocurable composition (A) has a high viscosity and is difficult to handle in view of coatability, the concentration of the photocurable composition (A) is 20%.
It was diluted with a mixed solvent of isopropyl alcohol / hexane so as to become 100%.

The photocurable composition (A) diluted with an isopropyl alcohol / hexane mixed solvent was applied to the flat surface of the lenticular lens sheet with a microgravure coater to a thickness of 0.02 mm, and the coating was performed at 60 ° C. for 1 minute. The solvent mixture is volatilized by drying and the coating thickness of the photocurable composition (A) is reduced to 0.
It was 004 mm.

The above lenticular lens sheet was irradiated with substantially parallel ultraviolet light from the convex cylindrical lens side in the atmosphere by a high pressure mercury lamp. On the flat surface side of the obtained lenticular lens sheet, a polyethylene terephthalate film for peeling, which was coated with Dainippon Ink and Chemicals Co., Ltd. UV curable ink for screen printing (Dicure SSD) with a comma coater to a thickness of 0.03 mN / m Pasted together. Then, parallel ultraviolet light was irradiated from the convex cylindrical lens side of the lenticular lens sheet by a high pressure mercury lamp. When the obtained lenticular lens sheet and the polyethylene terephthalate film for peeling were peeled off, a light-shielding pattern could be formed on both the front and back sides without axial misalignment. When the lenticular lens sheet on which the light-shielding pattern was formed was installed in the liquid crystal projection television, it was possible to observe a good image.

(Comparative Example 1) A lenticular lens sheet was obtained by 2P molding using a lens forming roll having an inverted shape of a lenticular lens formed by arranging convex cylindrical lenses having a pitch of 0.3 mm in parallel. At this time, as a base film, a 0.25 mm thick polyethylene terephthalate film (Cosmo Shine A4300) manufactured by Toyobo Co., Ltd.,
Acrylic UV curable resin (Aronix) manufactured by Toagosei Co., Ltd. was used as the 2P resin.

60 parts by mass of dipentaerythritol hexaacrylate (KAYARAD DPHA) manufactured by Nippon Kayaku Co., Ltd., 40 parts by mass of isocyanuric acid ethylene oxide modified triacrylate (Aronix M-315) manufactured by Toagosei Co., Ltd., Nippon Kayaku Co., Ltd. 1 part by mass of 2,4-diethylthioxanthone manufactured by Ciba Specialty Chemicals Co., Ltd. 2-methyl-1- [4- (methylthio) phenyl] -2
-Morpholinopropan-1-one (Irgacure 907) 3
A photocurable resin composition (a) was prepared by mixing in a proportion of parts by mass. When the surface free energy of the photocurable resin composition (a) was measured by the Wilhelmy method, it was 42.6 mN.
It was / m. Since the photocurable resin composition (a) has a high viscosity and is difficult to handle in view of coatability, it was diluted with toluene so that the concentration of the photocurable resin composition (a) was 5%. .

The diluted photocurable resin composition (a) was treated with PE.
After applying 0.02 mm to a T film with a bar coater, by vaporizing toluene, it is possible to obtain a film in which a photocurable resin composition (a) having a uniform thickness of 0.001 mm is applied onto a PET film. did it. The obtained film was divided into two parts, one of which was exposed to ultraviolet light by a high pressure mercury lamp in the air and the other in water. The contact angle with various solvents was measured on the surface of the obtained film using a contact angle meter manufactured by Kyowa Interface Science Co., Ltd. The results are shown in Table 2.

[0071]

[Table 2]

From the results shown in Table 2, the surface free energies when cured in air and in water were calculated to be 39.6 mN / m and 42.3 mN / m, respectively. Therefore, the photocurable resin composition (a) to which the compound (b) having a low surface free energy is not added does not exhibit the effect that a surface having a different surface free energy can be obtained even when cured in a different atmosphere. I understand.

The photocurable resin composition (a) diluted with toluene was coated on the flat surface of the lenticular lens sheet with a microgravure coater to a thickness of 0.02 mm.
Toluene was volatilized by drying at 0 ° C. for 5 minutes to make the coating thickness of the photocurable resin composition (a) 0.001 mm. The lenticular lens sheet was irradiated with substantially parallel ultraviolet light from a convex cylindrical lens side by a high pressure mercury lamp in a nitrogen atmosphere. Further, while the lenticular lens sheet was immersed in water, ultraviolet light was irradiated from a flat surface side of the lenticular lens sheet by a high pressure mercury lamp.

On the flat surface side of the obtained lenticular lens sheet, a polyethylene terephthalate film substrate coated with a 0.003 mm thick UV curable ink for PS plate offset printing (FD Carton ink) manufactured by Toyo Ink Mfg. Co., Ltd. was applied. I matched it. Ultraviolet light was radiated from a polyethylene terephthalate film base material by a high pressure mercury lamp to dry the PS plate offset printing UV curable ink, and then the polyethylene terephthalate film base material was peeled off, but a light shielding pattern was not formed and a lenticular The UV curable ink for PS plate offset printing adhered to both surfaces of the lens sheet and the polyethylene terephthalate film substrate.

[0075]

According to the present invention, it is possible to obtain a lens sheet which is applied to a screen for a pixel type projection television characterized by high definition and high image quality and in which light shielding patterns are formed on both front and back surfaces without axial misalignment. Also, a simple manufacturing method thereof is provided.

[Brief description of drawings]

FIG. 1 is a diagram illustrating curing of a photocurable composition (A) in a medium having low surface free energy.

FIG. 2 is a diagram showing one of the embodiments of the present invention.

FIG. 3 is a diagram showing one of the embodiments of the present invention.

FIG. 4 is a diagram showing one of the embodiments of the present invention.

FIG. 5 is a diagram illustrating a Wilhelmy method.

FIG. 6 is a diagram illustrating a solid surface free energy measuring method.

FIG. 7 is a diagram showing a lenticular lens sheet for a CRT type projection television.

FIG. 8 is a diagram showing a lens sheet for a pixel type projection television.

[Explanation of symbols]

1. Lens sheet 2. lens 3. Photocurable composition (A) layer 4. Shading pattern

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tatsufumi Watanabe             41 Miyukigaoka, Tsukuba City, Ibaraki Prefecture Co., Ltd.             Kuraray F-term (reference) 2H021 BA22 BA23 BA26 BA29 BA32                 2H042 AA09 AA15 AA26 AA28                 2H091 FA34X FA50X FB03 FB04                       FC19 FD02 LA16 MA07

Claims (13)

[Claims] 1. A lens sheet comprising a lens portion in which a plurality of convex lenses are arranged and a light-shielding pattern provided on a non-light-condensing portion formed by the convex lenses on a surface opposite to the lens portion, wherein the light-shielding pattern is photocurable. 100% by mass of a photocurable resin composition (a), which is provided on a layer made of a cured product of the composition (A) and has a surface free energy of 30 mN / m or more. Part and a composition comprising 0.01 to 10 parts by mass of a compound (b) having a surface free energy of 25 mN / m or less, a lens sheet. 2. A lens sheet comprising a lens portion in which a plurality of convex lenses are arranged and a light-shielding pattern provided on a non-light-condensing portion by the convex lens on a surface opposite to the lens portion, wherein the light-shielding pattern is photocurable. The surface free energy of the layer formed of the cured product of the composition (A) is 25 mN / m or less at the condensing part of the convex lens of the layer formed of the cured product of the photocurable composition (A). A lens sheet characterized by being present. 3. The lens sheet according to claim 1, wherein the lens portion is composed of a convex cylindrical lens group arranged one-dimensionally. 4. The lens unit is a convex microlens array comprising convex lens groups arranged two-dimensionally.
Or the lens sheet according to 2. 5. A method for manufacturing a lens sheet, comprising: a lens portion in which a plurality of convex lenses are arranged; and a light-shielding pattern provided on a non-light-condensing portion formed by the convex lenses on a surface opposite to the lens portion, the method comprising: On the surface opposite to the lens portion, 100 parts by mass of a photocurable resin composition (a) having a surface free energy of 30 mN / m or more and a compound (b) 0.01 to 10 having a surface free energy of 25 mN / m or less.
A step of applying a photocurable composition (A) composed of parts by mass to form a layer composed of the photocurable composition (A); a layer composed of the photocurable composition (A) is a compound (b). In a state of being in contact with a medium having a surface free energy lower than the surface free energy of (1), the photocurable composition (A) in the condensing part by the convex lens by irradiating light from the lens part side.
Selectively curing the layer composed of the following components; a step of applying a colored coating composition on the layer composed of the photocurable composition (A) after the above-described process to form a light-shielding pattern on the non-light-condensing portion formed by the convex lens; A method of manufacturing a lens sheet, comprising: 6. The step of forming a light-shielding pattern in the non-light-collecting portion includes a step of applying a color coating material and a step of repelling the colored coating material applied to the light-collecting portion so that the photocurable composition (A 6. The method for producing a lens sheet according to claim 5, further comprising a step of drying the colored paint after a time for exposing the layer substantially completely has elapsed. 7. The method according to claim 5, wherein the step of forming the light-shielding pattern on the non-light-collecting portion includes a step of applying a colored coating material, a step of drying the colored coating material, and a step of removing the colored coating material on the light-collecting portion. A method for manufacturing the described lens sheet. 8. The step of forming a light-shielding pattern on the non-light-condensing portion includes a step of applying a photocurable color coating material to a release sheet, the applied photocurable color coating material and the photocurable composition (A). ), A step of irradiating light from the lens part side to selectively cure the photocurable colored coating material in the condensing part by the convex lens, a step of separating the release sheet and the lens sheet The method for manufacturing a lens sheet according to claim 5, comprising: 9. Between the step of irradiating light from the lens portion side to selectively cure the layer of the photocurable composition (A) in the condensing portion by the convex lens and the step of forming a light shielding pattern. In the state where the layer comprising the photocurable composition (A) is in contact with a medium having a surface free energy higher than that of the photocurable resin composition (a), The method for producing a lens sheet according to claim 5, further comprising the step of irradiating the composition with a light to cure the uncured portion of the layer comprising the photocurable composition (A). 10. The method for producing a lens sheet according to claim 5, wherein the medium having a surface free energy lower than that of the compound (b) is air. 11. The method for producing a lens sheet according to claim 9, wherein the medium having a higher surface free energy than that of the photocurable resin composition (a) is water. 12. The method for manufacturing a lens sheet according to claim 5, wherein the traveling directions of light emitted from the lens portion side are substantially parallel to each other. 13. The lens sheet is a lens sheet for a transmissive screen used in an image display device for projecting and displaying an image from the back side, and the traveling direction of the light emitted from the lens portion side is the projected light of the image. It is substantially equivalent to
12. The method for manufacturing a lens sheet according to any one of item 11.