JP2018151425A - Light control panel, optical imaging device and method for manufacturing light control panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light control panel and an optical imaging device having excellent imaging qualities, and a method for manufacturing a light control panel.SOLUTION: The method for manufacturing a light control panel includes steps of: manufacturing a strip-like transparent substrate 12 made of a cured product of an allyl ester resin composition; forming a reflection layer on at least one surface of the transparent substrate 12 to produce a strip-like laminate while conveying the transparent substrate in a longitudinal direction; cutting the strip-like laminate in a predetermined length to obtain a plurality of first laminates 18; stacking the plurality of first laminates 18 to obtain a multilayer laminate; and cutting the multilayer laminate along a plane intersecting the transparent substrate 12 to obtain a light control panel including a plurality of light-transmitting parts and the reflection layers. In the step of stacking the plurality of first laminates 18, the first laminates 18 are stacked in such a manner that a longitudinal direction D3 of at least one of the plurality of first laminates 18 is different from a longitudinal direction D3 of one of other first laminates 18.SELECTED DRAWING: Figure 10

Description

  The present invention relates to a light control panel, an optical imaging device, and a method for manufacturing the light control panel.

Conventionally, an optical imaging device has been used in which two light control panels each having a plurality of strip-shaped light reflecting portions are arranged so that the light reflecting portions are orthogonal to each other (for example, Patent Document 1 and Patents). Reference 2).
In the optical imaging device, the light incident from one side passes through the light control panel while being reflected by the light reflecting portion, and converges in the space on the other side to project a stereoscopic image. Optical imaging devices are applied to stereoscopic display devices, game machines, game machines, advertising towers, and the like.

The light control panel can be manufactured, for example, as follows.
An allyl ester resin composition is cast on a band-shaped base film and cured while being conveyed by a roll-to-roll method to obtain a band-shaped transparent substrate. Next, after peeling the base film from the strip-shaped transparent substrate, a reflective layer is formed on both surfaces of the strip-shaped transparent substrate while being conveyed by a roll-to-roll method, thereby obtaining a strip-shaped laminate. A plurality of laminates obtained by cutting the strip-like laminate into a predetermined length are laminated to form a block-like multilayer laminate. The multilayer control body is cut in the thickness direction and cut into a plate shape to obtain a light control panel.

Japanese Patent No. 5437436 International Publication No. 2006-088580

In a conventional light control panel, there is a case where distortion occurs in image formation in an optical imaging apparatus due to distortion of the transparent substrate, optical anisotropy, delamination, and the like.
An object of one embodiment of the present invention is to provide a light control panel, an optical imaging device, and a method for manufacturing the light control panel, which are excellent in imaging quality.

（式中、Ｒ^３はアリル基またはメタリル基を表し、Ａ^２はジカルボン酸に由来する、脂環式構造及び芳香環構造の少なくともいずれか一方を有する１種以上の有機残基を表す。）で示される基を末端基として有し、かつ一般式（３）

（式中、Ａ^３はジカルボン酸に由来する、脂環式構造及び芳香環構造の少なくともいずれか一方を有する一種以上の有機残基を表し、Ｘは多価アルコールから誘導された一種以上の有機残基を表す。ただし、Ｘはエステル結合によって、さらに前記一般式（２）を末端基とし、前記一般式（３）を構成単位とする分岐構造を有することができる。）で示される構造を構成単位として有するアリルエステルオリゴマーを含むものである前項１または２に記載の光制御パネルの製造方法。
［４］前記反射層は、アルミニウム、銀及びクロムから選択される金属からなる金属膜を有する前項１〜３のうちいずれか１項に記載の光制御パネルの製造方法。
［５］可視光が透過可能な複数の光透過部と、隣り合う前記光透過部の間に形成された反射層とを備え、前記反射層は、前記光透過部を通る可視光を反射する光反射面を有し、前記光透過部は、少なくとも一部がアリルエステル樹脂組成物の硬化物からなり、厚さ方向と長さ方向の引張弾性率が異なり、前記複数の光透過部のうち少なくとも１つにおける厚さ方向と長さ方向の引張弾性率の大小関係は、他の光透過部のうち少なくとも１つにおける厚さ方向と長さ方向の引張弾性率の大小関係とは逆である光制御パネル。
［６］厚さ方向の引張弾性率が長さ方向の引張弾性率より大である前記光透過部と、厚さ方向の引張弾性率が長さ方向の引張弾性率より小である前記光透過部とが交互に並ぶ前項５に記載の光制御パネル。
［７］前項５または６に記載の光制御パネルを少なくとも一対有し、前記一対の光制御パネルは、厚さ方向から見て少なくとも一部が重なり、重なり領域において前記反射層が交差するように配置されている光学結像装置。 One embodiment of the present invention relates to the following [1] to [7].
[1] A step of producing a band-shaped transparent base material, at least part of which is a cured product of the allyl ester resin composition, and capable of transmitting visible light; Forming a reflective layer on one surface to form a strip-shaped laminate, cutting the strip-shaped laminate into a predetermined length to obtain a plurality of first laminates, and a plurality of the first laminates A plurality of light transmission parts cut out from the transparent base material by cutting the multi-layer laminated body along a surface intersecting the transparent base material, and laminating the multi-layer laminated body. And obtaining a light control panel having a light reflecting surface that reflects visible light that passes through the light transmitting portion. In the step of laminating the plurality of first laminated bodies to form a multilayer laminated body, The manufacturing method of the light control panel which laminates | stacks the said 1st laminated body so that at least 1 length direction among the several 1st laminated bodies differs from at least 1 length direction among other 1st laminated bodies. .
[2] In the step of laminating the plurality of first laminated bodies to form a multilayer laminated body, the preceding paragraph 1 in which the first laminated bodies are laminated so that the length directions of the adjacent first laminated bodies are orthogonal to each other. The manufacturing method of the light control panel as described in 1 ..
[3] The allyl ester resin composition has the general formula (2)

(In the formula, R ³ represents an allyl group or a methallyl group, and A ² represents one or more organic residues having at least one of an alicyclic structure and an aromatic ring structure derived from dicarboxylic acid.) And a group represented by the general formula (3)

(In the formula, A ³ represents one or more organic residues derived from dicarboxylic acid and having at least one of an alicyclic structure and an aromatic ring structure, and X represents one or more organic derivatives derived from polyhydric alcohols. X represents an ester bond, and can have a branched structure having the general formula (2) as a terminal group and the general formula (3) as a constituent unit. 3. The method for producing a light control panel according to item 1 or 2, which comprises an allyl ester oligomer having as a structural unit.
[4] The method for manufacturing a light control panel according to any one of items 1 to 3, wherein the reflective layer has a metal film made of a metal selected from aluminum, silver, and chromium.
[5] A plurality of light transmissive portions capable of transmitting visible light and a reflective layer formed between the adjacent light transmissive portions, wherein the reflective layer reflects visible light passing through the light transmissive portions. Having a light reflecting surface, and at least a portion of the light transmitting portion is formed of a cured product of the allyl ester resin composition, and has different tensile elastic modulus in the thickness direction and the length direction, and among the plurality of light transmitting portions. The magnitude relationship between the tensile modulus in the thickness direction and the length direction in at least one is opposite to the magnitude relationship between the tensile modulus in the thickness direction and the length direction in at least one of the other light transmission portions. Light control panel.
[6] The light transmitting portion in which the tensile modulus in the thickness direction is larger than the tensile modulus in the length direction, and the light transmission in which the tensile modulus in the thickness direction is smaller than the tensile modulus in the length direction. 6. The light control panel according to 5 above, wherein the parts are alternately arranged.
[7] At least a pair of the light control panels according to the above 5 or 6 is provided, and at least a part of the pair of light control panels overlaps when viewed from the thickness direction, and the reflective layers intersect in the overlapping region. Arranged optical imaging device.

According to one aspect of the present invention, in the production of the multilayer laminate, the plurality of first laminates includes the length direction of at least one first laminate and at least one length of the other first laminates. It arrange | positions so that a vertical direction may differ.
The transparent base material may have different physical properties in the length direction and width direction due to the tension during transportation, but according to this manufacturing method, the length directions of some of the first laminates are different from each other. , It is possible to avoid the difference in physical properties from being enlarged and to suppress the distortion generated in the multilayer laminate. Therefore, a light control panel with less distortion can be obtained. Therefore, imaging quality can be improved in the optical imaging apparatus.

1 is an exploded perspective view schematically showing an optical imaging apparatus of an embodiment. It is a perspective view which shows typically the optical imaging device of FIG. It is a perspective view which shows a light control panel. It is a perspective view which expands and shows the light control panel of FIG. It is explanatory drawing which shows the manufacturing process of the light control panel of FIG. 3, and is a figure which shows a transparent base material. It is a figure which shows the transparent base material shown to a previous figure. It is explanatory drawing which shows the manufacturing process following a previous figure. It is explanatory drawing which shows the manufacturing process following a previous figure. It is explanatory drawing which shows the manufacturing process following a previous figure. It is explanatory drawing which shows the manufacturing process following a previous figure. It is explanatory drawing which shows the manufacturing process following a previous figure. It is explanatory drawing which shows the manufacturing process following a previous figure. It is explanatory drawing which shows the manufacturing process following a previous figure.

Hereinafter, embodiments of the present invention will be described in detail.
<Optical imaging device>
FIG. 1 is an exploded perspective view schematically illustrating an optical imaging apparatus according to an embodiment. FIG. 2 is a perspective view schematically showing the optical imaging apparatus 10.
As shown in FIGS. 1 and 2, the optical imaging apparatus 10 includes a pair of light control panels 1, 1 facing each other, and transparent protective layers 6, 6 provided on the outer surface side of the light control panels 1, 1, respectively. I have. Hereinafter, the two light control panels 1 and 1 are referred to as a first light control panel 1A and a second light control panel 1B, respectively.
The light control panels 1, 1 (1 </ b> A, 1 </ b> B) are fixed via an adhesive layer 7. The light control panels 1 and 1 (1A and 1B) and the transparent protective layers 6 and 6 are fixed via adhesive layers 8 and 8, respectively.

[Light control panel]
As shown in FIGS. 3 and 4, the light control panel 1 includes a plurality of light transmission parts 2 and a plurality of reflection layers 3.
In the following description, an XYZ orthogonal coordinate system may be adopted. The X direction is an arrangement direction of the plurality of light transmission parts 2. The Y direction is a direction orthogonal to the X direction in a plane along the first main surface 1 a of the light control panel 1. The Z direction is a direction orthogonal to the X direction and the Y direction, and is the thickness direction of the light control panel 1. The plan view of the light control panel 1 refers to viewing from the thickness direction (Z direction) of the light control panel 1.
The plurality of light transmission portions 2 and the plurality of reflection layers 3 are alternately arranged in the X direction.

[Light transmission part]
The light transmissive portion 2 has a rectangular XZ cross section and extends in the Y direction. The plurality of light transmission portions 2 are arranged in the width direction (X direction) with the length direction aligned. The light transmission portion 2 is a transparent layer that allows visible light to pass therethrough. The light transmission part 2 is preferably capable of transmitting visible light in the entire wavelength range.

  The first main surface 2a of the light transmission portion 2 and the second main surface 2b which is the opposite surface are surfaces along the XY plane. The first main surface 2 a is a surface included in the first main surface 1 a of the light control panel 1. The second main surface 2b is a surface included in the second main surface 1b that is the surface opposite to the first main surface 1a of the light control panel 1. The side surface 2c of the light transmission part 2 is a surface facing the adjacent light transmission part 2, and is a surface along the YZ plane.

  The interval between the reflective layers 3 of the light control panel 1 substantially corresponds to the dimension of the light transmission part 2 in the arrangement direction (X direction), and the dimension (for example, the width W1 of the light transmission part 2 in FIG. 4) is 0.2 to. 0.5 mm is preferred. The widths W1 of the plurality of light transmission parts 2 are preferably equal to each other.

The surface hardness of the light transmission part 2 is preferably 2H or more in terms of pencil hardness. When the surface hardness is 2H or more in terms of pencil hardness, problems such as scratches are less likely to occur in the work process.
In addition to the pencil hardness described above, the light transmission part 2 is desired to have a high total light transmittance and a low haze value (cloudiness value). Thereby, when used in a light control panel, a high-definition reflection image is obtained. The total light transmittance is preferably 90% or more, and more preferably 91% or more. The haze value is preferably 1% or less, more preferably 0.5% or less.

  In terms of obtaining a high-definition image, “Abbe number” and “smoothness” are also important characteristics. The Abbe number is a numerical value indicating the wavelength dependence of the refractive index, and if the Abbe number of the light transmitting portion 2 is too low, the image may become unclear. The Abbe number of the light transmission part 2 is preferably 40 or more, more preferably 50 or more.

Smoothness is particularly important on the surface on which the metal film 4 is formed (side surface 2c in FIG. 4). If the smoothness is too low, the image may appear blurred and the texture may be impaired. The smoothness is preferably less than 10 nm, more preferably less than 5 nm, and particularly preferably less than 2 nm when expressed by arithmetic average roughness “Ra”.
Furthermore, it is preferable that the specific gravity of the light transmission part 2 is low in terms of handling properties.

[Allyl ester resin]
The light transmission part 2 is formed with the hardened | cured material of the allyl ester resin composition. Allyl ester resin is one type of thermosetting resin. The light transmission part 2 formed with the hardened | cured material of the allyl ester resin composition is excellent in transparency, and surface hardness and intensity | strength are also high.
In general, there are two cases where the term “allyl ester resin” refers to a prepolymer (including oligomers, additives, and monomers) before curing, and indicates a cured product thereof. Then, “allyl ester resin” indicates a cured product, and “allyl ester resin composition” indicates a prepolymer before curing.

[Allyl ester resin composition]
The allyl ester resin composition is a composition containing an allyl group or a methallyl group (hereinafter sometimes referred to as a (meth) allyl group) and a compound having an ester structure as main curing components.

  The compound having a (meth) allyl group and an ester structure is [1] an esterification reaction between a compound containing a (meth) allyl group and a hydroxyl group (herein collectively referred to as allyl alcohol) and a compound containing a carboxyl group, [2] It can be obtained by an esterification reaction between a compound containing a (meth) allyl group and a carboxyl group and a compound containing a hydroxyl group, or [3] an ester exchange reaction between an ester compound consisting of allyl alcohol and dicarboxylic acid and a polyhydric alcohol. When the compound containing a carboxyl group is a polyester oligomer of a dicarboxylic acid and a diol, only the terminal can be an ester with allyl alcohol.

（Ｒ^１、Ｒ^２は、それぞれ独立してアリル基またはメタリル基のいずれかの基を表し、Ａ^１はジカルボン酸に由来する、脂環式構造及び芳香環構造の少なくともいずれか一方を有する１種以上の有機残基を表す。）
で表される化合物の中から選ばれる少なくとも１種以上の化合物が挙げられる。この化合物は後述のアリルエステルオリゴマーの原料となるほか、反応性希釈剤（反応性モノマー）としてアリルエステル樹脂組成物に含まれてもよい。一般式（１）中のＡ^１は後述の一般式（２）、一般式（３）におけるＡ^２、Ａ^３と同様のものが好ましい。 As a specific example of the ester compound consisting of (meth) allyl alcohol and dicarboxylic acid, the following general formula (1)

(R ¹ and R ² each independently represents either an allyl group or a methallyl group, and A ¹ is derived from a dicarboxylic acid and has at least one of an alicyclic structure and an aromatic ring structure. Represents organic residues of more than species.)
And at least one compound selected from the compounds represented by: In addition to being a raw material for the allyl ester oligomer described below, this compound may be included in the allyl ester resin composition as a reactive diluent (reactive monomer). A ¹ in general formula (1) is preferably the same as A ² and A ³ in general formula (2) and general formula (3) described later.

As a compound having a (meth) allyl group, which is the main curing component of the allyl ester resin composition, and an ester structure, it is formed from a polyhydric alcohol and a dicarboxylic acid with at least one of an allyl group and a methallyl group as a terminal group. It is preferable that the allyl ester compound having an ester structure (hereinafter, this may be referred to as “allyl ester oligomer”).
Moreover, you may contain the hardening | curing agent mentioned later, a reactive monomer, an additive, other radical reactive resin components etc. as another component.

[Allyl ester oligomer]
As the allyl ester oligomer, a compound having a group represented by the following general formula (2) as a terminal group and a structure represented by the following general formula (3) as a structural unit is preferable.

（式中、Ｒ^３はアリル基またはメタリル基を表し、Ａ^２はジカルボン酸に由来する、脂環式構造及び芳香環構造の少なくともいずれか一方を有する１種以上の有機残基を表す。）

(In the formula, R ³ represents an allyl group or a methallyl group, and A ² represents one or more organic residues having at least one of an alicyclic structure and an aromatic ring structure derived from dicarboxylic acid.)

（式中、Ａ^３はジカルボン酸に由来する、脂環式構造及び芳香環構造の少なくともいずれか一方を有する１種以上の有機残基を表し、Ｘは多価アルコールから誘導された１種以上の有機残基を表す。ただし、Ｘはエステル結合によって、さらに前記一般式（２）を末端基とし、前記一般式（３）を構成単位とする分岐構造を有することができる。）

(In the formula, A ³ represents one or more organic residues having at least one of an alicyclic structure and an aromatic ring structure derived from dicarboxylic acid, and X is one or more derived from a polyhydric alcohol. Wherein X may have a branched structure having an ester bond and further having the general formula (2) as a terminal group and the general formula (3) as a constituent unit.

In the allyl ester oligomer, the number of terminal groups represented by the general formula (2) is at least 2 or more, but when X in the general formula (3) has a branched structure, the number is 3 or more. In this case, although also R ³ at each end groups there are a plurality, each of these R ³ may not necessarily be the same type, some end there in the structure of an allyl group, the other terminal methallyl group It doesn't matter.

Moreover, not all R ³ must be an allyl group or a methallyl group, and a part thereof may be a non-polymerizable group such as a methyl group or an ethyl group as long as the curability is not impaired.

Similarly, the structure represented by A ² may be different for each terminal group. For example, A ^{2 at} one terminal may be a benzene ring and the other may be a cyclohexane ring.
A ² in the general formula (2) is one or more organic residues having at least one of an alicyclic structure and an aromatic ring structure derived from a dicarboxylic acid. Portion derived from dicarboxylic acid is shown by a carbonyl structure adjacent to A ^2. Accordingly, the A ² portion represents a benzene skeleton or a cyclohexane skeleton.

There are no particular limitations on the dicarboxylic acid to induce A ² structure, from the viewpoint of ready availability of raw materials, terephthalic acid, isophthalic acid, phthalic acid, 1,4-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic Acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,7-naphthalenedicarboxylic acid, diphenyl-m, m′-dicarboxylic acid, diphenyl-p, p′-dicarboxylic acid, benzophenone-4, 4′-dicarboxylic acid, p-phenylenediacetic acid, p-carboxyphenylacetic acid, methyl terephthalic acid and tetrachlorophthalic acid are preferred, and terephthalic acid, isophthalic acid, phthalic acid and 1,4-cyclohexanedicarboxylic acid are particularly preferred.

  In addition, within the range that does not impair the effects of the present invention, acyclic dicarboxylic acids (during the reaction) such as maleic acid, fumaric acid, itaconic acid, citraconic acid, endic acid anhydride and chlorendic acid are used. Also good.

  At least one structural unit represented by the general formula (3) is necessary in the allyl ester oligomer. However, when this structure is repeated, the molecular weight of the allyl ester oligomer as a whole increases to some extent. Since it is obtained, workability is improved, and the toughness of the cured product is also improved, which is preferable. However, if the molecular weight is too large, the molecular weight between cross-linking points is too large, so that Tg is lowered and heat resistance may be lowered. It is important to adjust to an appropriate molecular weight according to the application.

The weight average molecular weight of the allyl ester oligomer is preferably 500 to 200,000, more preferably 1,000 to 100,000.
In addition, A ³ in the general formula (3) is one or more organic residues having at least one of an alicyclic structure and an aromatic ring structure derived from dicarboxylic acid. The same as A ² in the general formula (2).

X in the general formula (3) represents one or more organic residues derived from a polyhydric alcohol.
The polyhydric alcohol is a compound having two or more hydroxyl groups, and X itself represents a skeleton portion other than the hydroxyl groups of the polyhydric alcohol.
In addition, since at least two hydroxyl groups in the polyhydric alcohol need only be bonded, when the polyhydric alcohol as a raw material is trivalent or more, that is, when there are three or more hydroxyl groups, unreacted hydroxyl groups remain. May be.

  Specific examples of the polyhydric alcohol include ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,3-butanediol, 1,5-pentanediol, neopentyl glycol, 1,6 -Hexanediol, 1,4-cyclohexanedimethanol, diethylene glycol, ethylene oxide 3 mol adduct of isocyanuric acid, pentaerythritol, tricyclodecane dimethanol, glycerin, trimethylolpropane, pentaerythritol ethylene oxide 3 mol adduct, D-sorbitol And hydrogenated bisphenol A and the like. Although there is no restriction | limiting in particular as a manufacturing method of these compounds, For example, it can manufacture by the method mentioned in Japanese Patent Publication No. 6-74239.

As the structural unit represented by the general formula (3) in the allyl ester oligomer, the same structural unit may be repeated, but different structural units may be included. That is, the allyl ester oligomer may be a copolymer type. In this case, several types of X exist in one allyl ester oligomer. For example, the structure may be such that one of X is a residue derived from propylene glycol and the other X is a residue derived from trimethylolpropane. In this case, the allyl ester oligomer will be branched at the trimethylolpropane residue. A ³ may also be present are several types as well. A structural formula in the case where R ³ is an allyl group, A ² and A ³ are residues derived from isophthalic acid, and X is propylene glycol and trimethylolpropane is shown below.

[Curing agent]
A curing agent may be used in the allyl ester resin composition. There is no restriction | limiting in particular as a hardening | curing agent which can be used, What is generally used as a hardening | curing agent of polymeric resin can be used. Among these, it is desirable to add a radical polymerization initiator from the viewpoint of starting polymerization of the allyl group. Examples of the radical polymerization initiator include organic peroxides, photopolymerization initiators, azo compounds and the like.

  As the organic peroxide, known compounds such as dialkyl peroxides, acyl peroxides, hydroperoxides, ketone peroxides, peroxyesters and the like can be used. Specific examples thereof include benzoyl peroxide, 1,1 -Bis (t-butylperoxy) cyclohexane, 2,2-bis (4,4-dibutylperoxycyclohexyl) propane, t-butylperoxy-2-ethylhexanate, 2,5-dimethyl-2,5-di (T-butylperoxy) hexane, 2,5-dimethyl2,5-di (benzoylperoxy) hexane, t-butylperoxybenzoate, t-butylcumyl peroxide, p-methylhydroperoxide, t-butyl Hydroperoxide, cumene hydroperoxide, dicumyl Over peroxide, di -t- butyl peroxide, t-hexyl peroxy isopropyl monocarbonate, t- butyl peroxy isopropyl monocarbonate and 2,5-dimethyl-2,5-dibutyl peroxy f relaxin -3, and the like.

Examples of the photopolymerization initiator include 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxycyclohexyl phenyl ketone, benzophenone, 2-methyl-1- (4-methylthiophenyl)- 2-morpholinopropane-1, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1, 2-hydroxy-2-methyl-1-phenylpropan-1-one and 2,4, Examples include 6-trimethylbenzoyldiphenylphosphine oxide.
These radical polymerization initiators may be used alone or in combination of two or more.

  Although there is no restriction | limiting in particular in the compounding quantity of these hardening | curing agents, It is preferable to mix | blend 0.1-10 mass parts with respect to 100 mass parts of allyl ester resin compositions, and mixing 0.5-5 mass parts. More preferred. When the blending amount of the curing agent is less than 0.1 parts by mass, it is difficult to obtain a sufficient curing rate. When the blending amount exceeds 10 parts by mass, the final cured product becomes brittle and the mechanical strength decreases. There is a case.

[Reactive monomer]
A reactive monomer (reactive diluent) can also be added to the allyl ester resin composition for the purpose of controlling the curing reaction rate, adjusting the viscosity (improving workability), improving the crosslinking density, and adding functions.
These reactive monomers are not particularly limited, and various types can be used. However, in order to react with an allyl ester oligomer, a monomer having a radical polymerizable carbon-carbon double bond such as a vinyl group or an allyl group is used. preferable. Examples thereof include unsaturated fatty acid esters, aromatic vinyl compounds, vinyl esters of saturated fatty acids or aromatic carboxylic acids and derivatives thereof, crosslinkable polyfunctional monomers, and the like. Especially, if a crosslinkable polyfunctional monomer is used, the crosslinking density of hardened | cured material can also be controlled. Preferred specific examples of these reactive monomers are shown below.

As unsaturated fatty acid ester, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, dodecyl (meth) acrylate, octadecyl (meth) acrylate Alkyl (meth) acrylates such as cyclohexyl (meth) acrylate and methylcyclohexyl (meth) acrylate;
Phenyl (meth) acrylate, benzyl (meth) acrylate, 1-naphthyl (meth) acrylate, fluorophenyl (meth) acrylate, chlorophenyl (meth) acrylate, cyanophenyl (meth) acrylate, methoxyphenyl (meth) acrylate and biphenyl (meth) ) Acrylic acid aromatic esters such as acrylates;
Haloalkyl (meth) acrylates such as fluoromethyl (meth) acrylate and chloromethyl (meth) acrylate;
Furthermore, glycidyl (meth) acrylate, alkylamino (meth) acrylate, α-cyanoacrylic acid ester and the like can be mentioned.

Examples of the aromatic vinyl compound include styrene, α-methylstyrene, chlorostyrene, styrene sulfonic acid, 4-hydroxystyrene, vinyltoluene and the like.
Examples of vinyl esters of saturated fatty acids or aromatic carboxylic acids and derivatives thereof include vinyl acetate, vinyl propionate and vinyl benzoate.

As the crosslinkable polyfunctional monomer, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, 1,3-butylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,5-pentadiol di (meth) acrylate, 1,6-hexadiol di (meth) acrylate, neopentyl Glycol di (meth) acrylate, tricyclodecane di (meth) acrylate, oligoester di (meth) acrylate, polybutadiene di (meth) acrylate, 2,2-bis (4- (meth) acryloyloxyphenyl) pro Emissions and 2,2-bis (4-.omega. (meth) acryloyloxy pyridinium) phenyl) di (meth) acrylates such as propane;
Diallyl phthalate, diallyl isophthalate, dimethallyl isophthalate, diallyl terephthalate, triallyl trimellitic acid, diallyl 2,6-naphthalenedicarboxylate, diallyl 1,5-naphthalenedicarboxylate, allyl 1,4-xylenedicarboxylate and 4,4 Difunctional aromatic carboxylates such as diallyl 4'-diphenyldicarboxylate; bifunctional such as diallyl 1,4-cyclohexanedicarboxylate, diallyl 1,2-cyclohexanedicarboxylate, diallyl 1,3-cyclohexanedicarboxylate and divinylbenzene Crosslinkable monomer: trimethylolethane tri (meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, tri (meth) allyl isocyanurate, tri (meth) Trifunctional crosslinkable monomers such as allyl cyanurate, triallyl trimellitate and diallyl chlorendate;
Furthermore, monomers having a tetrafunctional or higher functional crosslinkable group, such as pentaerythritol tetra (meth) acrylate, ditrimethylolpropane poly (meth) acrylate, dipentaerythritol poly (meth) acrylate, and the like can be given.

  Said reactive monomer can be used individually by 1 type or in mixture of 2 or more types. Although there is no restriction | limiting in particular in the usage-amount of the resin component of these reactive monomers, It is preferable that it is 1-1000 mass parts with respect to 100 mass parts of allyl ester oligomers, and it is more preferable that it is 2-500 mass parts. Preferably, it is 5-100 mass parts. When the amount of the reactive monomer used is less than 1 part by mass, the effect of decreasing the viscosity is small, workability is deteriorated, and when a monofunctional monomer is used as the reactive monomer, the crosslinking density is lowered. This is not preferable because the hardness may be insufficient. Moreover, when the usage-amount exceeds 1000 mass parts, the outstanding transparency and mechanical strength of allyl ester resin itself may fall, and it is unpreferable.

[Radically reactive resin composition]
The allyl ester resin composition may contain a radical reactive resin component for the purpose of improving various physical properties. Examples of these resin components include unsaturated polyester resins and vinyl ester resins.

  Unsaturated polyester resin can be obtained by converting a condensation product obtained by esterification reaction of a polyhydric alcohol and an unsaturated polybasic acid (and a saturated polybasic acid if necessary) into a polymerizable unsaturated compound such as styrene. For example, the resins described in “Polyester Resin Handbook”, published by Nikkan Kogyo Shimbun, 1988, pages 16 to 18, pages 29 to 37, etc. can be mentioned. This unsaturated polyester resin can be produced by a known method.

  Vinyl ester resin, also called epoxy (meth) acrylate, is a ring-opening reaction between a compound having an epoxy group typically represented by an epoxy resin and a carboxyl group of a carboxyl compound having a polymerizable unsaturated group such as (meth) acrylic acid. Polymerized by a ring-opening reaction between a resin having a polymerizable unsaturated group produced by the above, or a compound having a carboxyl group and an epoxy group of a polymerizable unsaturated compound having an epoxy group in the molecule such as glycidyl (meth) acrylate It refers to a resin having a polymerizable unsaturated group. Details are described in “Polyester Resin Handbook”, published by Nikkan Kogyo Shimbun, 1988, pp. 336 to 357, and can be produced by known methods.

The epoxy resin used as the raw material for the vinyl ester resin includes bisphenol A diglycidyl ether and its high molecular weight homologue, glycidyl ether of bisphenol A alkylene oxide adduct, bisphenol F diglycidyl ether and its high molecular weight homologue, and bisphenol F alkylene oxide. Examples include adduct glycidyl ethers and novolac-type polyglycidyl ethers.
The above radical-reactive resin components can be used singly or in combination of two or more.

Although there is no restriction | limiting in particular in the usage-amount of these radical reactive resin components, It is preferable that it is 1-1000 mass parts with respect to 100 mass parts of allyl ester oligomers, and it is more preferable that it is 2-500 mass parts. Preferably, it is 5-100 mass parts.
When the amount of the reactive monomer used is less than 1 part by mass, the effect of improving the mechanical strength derived from the radical reactive resin component is small, and workability is deteriorated or moldability is deteriorated. Moreover, when the usage-amount exceeds 1000 mass parts, the heat resistance of allyl ester resin itself may not appear, and it is unpreferable.

[Additive]
In order to improve hardness, strength, moldability, durability, and water resistance, allyl ester resin compositions have ultraviolet absorbers, antioxidants, antifoaming agents, leveling agents, mold release agents, lubricants, and water repellents. Additives such as flame retardants, low shrinkage agents, and crosslinking aids can be added as necessary.
There is no restriction | limiting in particular as antioxidant, What is generally used can be used. Among them, phenolic antioxidants and amine antioxidants that are radical chain inhibitors are preferable, and phenolic antioxidants are particularly preferable. Phenol antioxidants include 2,6-t-butyl-p-cresol, 2,6-t-butyl-4-ethylphenol, 2,2′-methylenebis (4-methyl-6-t-butylphenol) and 1,1,3-tris (2-methyl-4-hydroxy-5-t-butylphenyl) butane and the like can be mentioned.

  There is no restriction | limiting in particular as a lubricant, What is generally used can be used. Among these, metal soap lubricants, fatty acid ester lubricants, aliphatic hydrocarbon lubricants and the like are preferable, and metal soap lubricants are particularly preferable. Examples of the metal soap lubricant include barium stearate, calcium stearate, zinc stearate, barium stearate, magnesium stearate, and aluminum stearate. These may be used as a complex.

  There is no restriction | limiting in particular as a ultraviolet absorber, The thing generally used can be used. Among these, benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers, and cyanoacrylate ultraviolet absorbers are preferable, and benzophenone ultraviolet absorbers are particularly preferable. Examples of benzophenone ultraviolet absorbers include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-5′-butylphenyl) benzotriazole and 2- (2-hydroxy-3). '-T-butylphenyl) benzotriazole and the like.

  However, these additives are not limited to the specific examples described above, and any additive can be added within a range that does not impair the object or effect of the present invention.

[Hardened product of allyl ester resin composition]
By curing the allyl ester resin composition by, for example, at least one of light irradiation and heating, a film or sheet excellent in transparency and heat resistance can be obtained.
The film usually refers to a film having a thickness of less than 250 μm, and the sheet refers to a film having a thickness of 250 μm or more.

  In producing a film or sheet from the resin composition, any curing method may be selected as long as a certain surface hardness is obtained. In order to obtain a surface hardness of a certain level or more, it is preferable to apply only a photocuring and thermosetting method or a thermosetting method after coating the resin composition in a film shape.

  The conditions for curing the resin composition are not particularly limited, but it is applied to a transparent plastic film such as a PET (polyethylene terephthalate) film or a PEN (polyethylene naphthalate) film, a metal sheet, or a glass plate. After stretching, it is preferable to carry out photocuring and heat curing, or heat curing.

In the case of photocuring, an ultraviolet irradiation method is generally used. For example, ultraviolet rays can be generated and irradiated using an ultraviolet lamp. Examples of ultraviolet lamps include metal halide lamps, high-pressure mercury lamps, low-pressure mercury lamps, pulse-type xenon lamps, xenon / mercury mixed lamps, low-pressure sterilization lamps, electrodeless lamps, and LED lamps, all of which can be used. Among these ultraviolet lamps, a metal halide lamp or a high-pressure mercury lamp is preferable. Irradiation conditions vary depending on each lamp condition, but the irradiation exposure dose is preferably about ²⁰ to 5000 mJ / cm ² . In addition, it is preferable to attach an elliptical, parabolic, diffusive or the like reflector to the ultraviolet lamp, and a heat ray cut filter or the like as a cooling measure. Moreover, in order to accelerate | stimulate hardening, you may heat to 30-80 degreeC previously, and may irradiate this with an ultraviolet-ray.

  In the case of thermosetting, the heating method is not particularly limited, but a heating method excellent in uniformity such as a hot air oven or a far infrared oven is preferable. The curing temperature is about 100 to 200 ° C, preferably 120 to 180 ° C. Although the curing time varies depending on the curing method, it is preferably 0.5 minutes to 5 hours for a hot air oven and 0.5 to 60 minutes for a far infrared oven.

  In addition, ultraviolet curing using a photopolymerization initiator and thermal curing using an organic peroxide or an azo compound are radical reactions and thus are susceptible to reaction inhibition by oxygen. In order to prevent oxygen inhibition during the curing reaction, the curable composition should be applied to a transparent plastic film, a metal sheet, or a base sheet such as a glass plate, applied onto the base film, cast, and before photocuring. It is preferable that a transparent cover film is applied on the curable composition so that the oxygen concentration on the surface of the cast curable composition is 1% or less. It is necessary to use a transparent cover film that does not have pores on the surface, has a low oxygen permeability, and can withstand the heat generated during ultraviolet curing or thermal curing. For example, PET (polyethylene terephthalate), PEN (polyethylene naphthalate), PC (polycarbonate), PP (polypropylene), acetate resin, acrylic resin, vinyl fluoride, polyamide, polyarylate, polyethersulfone, cycloolefin polymer (norbornene resin) ) And the like, and these can be used alone or in combination of two or more.

  However, since it must be possible to peel off the cured product after curing, the surface of these base sheet, base film, and transparent cover film may be subjected to easy peeling treatment such as silicone resin coating or fluororesin coating. Good.

  Since the allyl ester resin composition is in a liquid state, it can be applied, coated, and the like so as to have a predetermined shape and form using a known coating apparatus. Examples of the coating method include gravure coating, roll coating, reverse coating, knife coating, die coating, lip coating, doctor coating, extrusion coating, slide coating, wire bar coating, curtain coating, and spinner coating. In addition, as a preferable viscosity range of the allyl ester resin composition at the time of application | coating, coating, and shaping | molding, it is the range of 100-100,000 mPa * s at normal temperature.

[Reflective layer]
The reflective layer 3 includes, for example, metal films 4 and 4 and an adhesive layer 5 provided between the metal films 4 and 4. There is no particular limitation on the type of metal constituting the metal film 4, but a metal having a high visible light reflectance is desirable.
In order to accurately reflect the color tone of the original image of the reflected image, it is desirable that the metal constituting the metal film 4 is an achromatic (for example, silver) metal. Examples of metals that can be used include aluminum, silver, gold, titanium, nickel, copper, tin, indium, chromium, and alloys thereof. Among these, aluminum, silver, and chromium are preferable.

The metal film 4 is formed between the adjacent light transmission portions 2 and 2 in a strip shape extending in the length direction of the light transmission portion 2 along the side surface 2 c of the light transmission portion 2. It is preferable that the metal film 4 has a shape that covers the entire side surface 2 c of the light transmission portion 2. For example, the metal film 4 is formed in contact with the side surface 2c. The metal film 4 is formed, for example, perpendicular to the main surfaces 2a and 2b of the light transmission part 2.
At least the surface of the metal film 4 on the light transmitting portion 2 side is a light reflecting surface 4a on which visible light passing through the light transmitting portion 2 is reflected. The light reflecting surface 4a is a surface perpendicular to the main surfaces 2a and 2b of the light transmitting portion 2, for example.

The adhesive layer 5 is made of, for example, a pressure-sensitive adhesive or an adhesive. The material for the adhesive layer 5 is not particularly limited. Examples of the adhesive include rubber, acrylic, silicone, and urethane. Examples of the adhesive include solvent type such as phenol resin, vinyl acetate type and chloroprene rubber type, curing reaction type such as epoxy resin type, acrylic resin type and silicone rubber type, and heat melting type such as styrene butadiene rubber type.
The adhesive layer 5 is preferably an adhesive made of a photocurable (for example, ultraviolet curable) resin. The adhesive layer 5 is preferably formed over the entire surface of the metal film 4.

  The light control panels 1 and 1 (1A and 1B) are arranged so that at least a part thereof overlaps in a plan view and the reflection layers 3 and 3 (3A and 3B) intersect in the overlapping region. The light control panels 1A and 1B shown in FIG. 1 are arranged so that the entire areas overlap in a plan view, and the reflective layers 3A and 3B are orthogonal to each other.

  The thickness of the light control panel 1 may be appropriately adjusted according to the size (for example, dimensions in the X direction and the Y direction), but is preferably 0.5 to 10 mm, for example.

[Transparent protective layer]
The transparent protective layers 6 and 6 are formed in a film shape or a sheet shape, and are capable of transmitting visible light (for example, a wavelength of 380 nm to 750 nm). The transparent protective layer 6 is preferably capable of transmitting visible light in the entire wavelength range. 1 and 2, the transparent protective layers 6 and 6 are provided on the upper surface side of the first light control panel 1A and the lower surface side of the second light control panel 1B, respectively. The transparent protective layer 6 on the upper surface side of the first light control panel 1A is referred to as a first transparent protective layer 6A, and the transparent protective layer 6 on the lower surface side of the second light control panel 1B is referred to as a second transparent protective layer 6B. . The transparent protective layer is also referred to as a transparent protective part.

The transparent protective layer 6 is made of, for example, a cured product of an allyl ester resin composition. The constituent material of the transparent protective layer 6 may be glass or the like.
The thickness of the transparent protective layer 6 is suitably 0.05 to 1 mm (preferably 0.1 to 0.5 mm). By setting the thickness of the transparent protective layer 6 to 0.05 mm or more, the strength of the transparent protective layer 6 can be increased. By setting the thickness of the transparent protective layer 6 to 1 mm or less, the transparency of the transparent protective layer 6 can be increased.

The adhesive layers 7 and 8 are made of, for example, an adhesive or an adhesive. The material of the adhesive layers 7 and 8 is not particularly limited as long as it is colorless and transparent. Examples of the adhesive include rubber, acrylic, silicone, and urethane. Examples of the adhesive include solvent type such as phenol resin, vinyl acetate type and chloroprene rubber type, curing reaction type such as epoxy resin type, acrylic resin type and silicone rubber type, and heat melting type such as styrene butadiene rubber type.
The adhesive layers 7 and 8 are preferably an adhesive made of a photocurable (for example, ultraviolet curable) resin.

  As shown in FIG. 2, in the optical imaging device 10, light L1 and L2 from one side (the lower side in FIG. 2) of the optical imaging device 10 passes through the second transparent protective layer 6B and is second. Is incident on the light control panel 1B and reflected by the light reflecting surface 4a of the reflective layer 3B. Reflected lights RB1 and RB2 from the light reflecting surface 4a of the reflecting layer 3B are incident on the first light control panel 1A and reflected by the light reflecting surface 4a of the reflecting layer 3A. The reflected lights RA1 and RA2 from the light reflecting surface 4a of the reflective layer 3A are transmitted through the first transparent protective layer 6A, and the stereoscopic image 20 is displayed on the other side (the upper side in FIG. 2) of the optical imaging device 10. To do.

<Method for Manufacturing Optical Imaging Apparatus>
Next, an example of a method for manufacturing the optical imaging device 10 will be described.
[Preparation of transparent substrate]
As shown in FIGS. 5 and 6, the allyl ester resin composition is made of an allyl ester resin by casting on a strip-like long base film such as a PET film and curing it by, for example, light irradiation or heating. A sheet-like transparent substrate 12 is produced. The transparent substrate 12 can transmit visible light.
The transparent substrate 12 has a long belt shape. D1 is the length direction of the transparent substrate 12. D2 is the width direction of the transparent substrate 12, and is a direction orthogonal to the length direction D1 in the plane along the transparent substrate 12. Since the transparent substrate 12 is tensioned in the length direction D1 during the curing reaction or conveyed, the physical properties such as the amount of expansion or contraction at the time of temperature change differ between the length direction D1 and the width direction D2. There is a case.

[Metal film formation]
As illustrated in FIG. 7, the metal films 14 are formed on both surfaces of the transparent substrate 12 while the transparent substrate 12 is conveyed in the length direction D <b> 1. A laminate in which the metal films 14 are formed on both surfaces of the transparent substrate 12 is referred to as a strip-like laminate 16.
In order to convey the transparent substrate 12 in the length direction D1, a roll-to-roll method can be adopted. By adopting the roll-to-roll method, productivity can be increased.

  A method for forming the metal film 14 on the surface of the transparent substrate 12 is not particularly limited, and examples thereof include a transfer method, a dry coating method, and a wet coating method. As a transfer method, there is a method of attaching a metal foil to the transparent substrate 12 with an adhesive. Examples of the dry coating method include a vacuum deposition method, a sputtering method, an ion plating method, and an ion beam sputtering method. Examples of the wet coating method include a wet plating method. In order to form the metal film 14 uniformly and thinly on the surface of the transparent substrate 12, a dry method such as a vacuum deposition method or a sputtering method is preferable. The metal film 14 may be formed on one surface of the transparent substrate 12 and then formed on the other surface, or may be formed simultaneously on both surfaces of the transparent substrate 12.

[Production of First Laminate]
As shown in FIG. 8, the adhesive layer 15 is formed on one surface of the strip-shaped laminate 16 by applying an adhesive or the like. A laminate in which the adhesive layer 15 is formed on the belt-like laminate 16 is referred to as a belt-like laminate 17 with an adhesive layer. In addition, the aspect with which the contact bonding layer 15 was formed in both surfaces of the strip | belt-shaped laminated body 16 by apply | coating an adhesive etc. to both surfaces of the strip | belt-shaped laminated body 16 may be sufficient as a strip | belt-shaped laminated body with an adhesive layer (not shown). ). An adhesive or the like may be thinly applied to both surfaces of the transparent substrate 12 (not shown).
As shown in FIG. 9, the strip-shaped laminated body 17 with the adhesive layer is cut into a predetermined length to obtain a plurality of first laminated bodies 18. The first stacked body 18 is, for example, a rectangle (that is, a square) having the same dimension in the length direction D3 (direction along the length direction D1) and the dimension in the width direction D4 (direction along the width direction D2). preferable. The plurality of first stacked bodies 18 are preferably the same length.
The formation of the metal film and the formation of the adhesive layer may be performed for each sheet after cutting the strip-shaped transparent substrate into a predetermined size (such as a square).

[Production of multi-layer laminate]
As shown in FIGS. 10 and 11, a plurality of first stacked bodies 18 are stacked. The first stacked body 18 is stacked so that the adhesive layer 15 contacts the metal film 14 of the first stacked body 18 adjacent to the lower side. In addition, as the first laminated body 18 on the lowermost layer side, the one on which the adhesive layer 15 is not formed is used.
As shown in FIG. 11, by pressing and heating with a press machine or the like as necessary, a block-shaped multilayer laminate 19 having a structure in which the transparent base material 12 and the reflective layer 13 are alternately laminated is formed. obtain. The reflective layer 13 includes metal films 14 and 14 and an adhesive layer 15 provided between the metal films 14 and 14.

As shown in FIG. 10, the plurality of first laminated bodies 18 constituting the multilayer laminated body 19 includes at least one of the length direction D3 of at least one first laminated body 18 and the other first laminated bodies 18. The two length directions D3 are arranged differently.
In the multilayer laminate 19 shown in FIGS. 10 and 11, the plurality of first laminates 18 are arranged such that the length directions D3 of the first laminates 18 and 18 adjacent in the thickness direction are orthogonal to each other in plan view. Laminated. That is, in the multilayer laminate 19, as shown in FIG. 10, the first laminate 18 (18A) in which the length direction D3 is directed to the first direction A1, and the length direction D3 in the second direction A2 The directed first laminated bodies 18 (18B) are alternately laminated.
Here, the plan view means viewing from the thickness direction of the first stacked body 18. The first direction A1 and the second direction A2 are orthogonal to each other. The first stacked body 18 is parallel to the plane formed by the first direction A1 and the second direction A2.

As described above, the transparent substrate 12 shown in FIGS. 5 and 6 may have different physical properties in the length direction D1 and the width direction D2 due to the tension at the time of conveyance. Therefore, when the plurality of first stacked bodies 18 are arranged in the multilayer direction 19 with the length direction D3 aligned, the difference in physical properties between the length direction D3 and the width direction D4 is enlarged, and the multilayer structure 19 is distorted. May occur.
On the other hand, in this manufacturing method, the length direction D3 of the plurality of first laminates 18 is different from each other, thereby reducing the difference in physical properties between the length direction D3 and the width direction D4. The distortion which arises can be suppressed.

[Production of light control panel]
As shown in FIGS. 12 and 13, the multilayer laminate 19 is cut along a plane intersecting the transparent substrate 12 (for example, a plane perpendicular to the transparent substrate 12) at the cutting location 21. The light control panel 1 shown in FIG. 3 is obtained by cutting out a part in a plate shape. The transparent substrate 12 of the multilayer laminate 19 becomes the light transmission part 2 of the light control panel 1. The reflective layer 13 becomes the reflective layer 3. The metal film 14 and the adhesive layer 15 become the metal film 4 and the adhesive layer 5, respectively.
Cutting methods such as sawing method, wire saw method, contour machine method, shearing method, lathe method, router processing, gas cutting method, laser cutting method, plasma cutting method, water jet cutting method can be adopted. .

As described above, the transparent substrate 12 may have different physical properties in the length direction D1 (length direction D3) and the width direction D2 (width direction D4) due to the tension at the time of conveyance. In that case, in the light control panel 1, the tensile elastic modulus (based on JIS K 7161) in the thickness direction (Z direction in FIG. 3) and the length direction (Y direction in FIG. 3) of the light transmitting portion 2 are different.
In the multilayer control body 19, the length direction D3 of at least one first stack 18 is different from at least one length direction D3 of the other first stack 18, so that in the light control panel 1, at least The magnitude relationship between the tensile modulus in the thickness direction and the length direction in one light transmitting portion 2 is the magnitude relationship between the tensile modulus in the thickness direction and the length direction in at least one of the other light transmitting portions 2. Is the opposite.

  The multilayer laminate 19 shown in FIG. 11 includes a first laminate 18 (18A) in which the length direction D3 is oriented in the first direction A1, and a first laminate in which the length direction D3 is oriented in the second direction A2. Since the bodies 18 (18B) are alternately stacked, in the light control panel 1, the thickness direction (Z direction in FIG. 3) and the length direction (Y direction in FIG. 3) of the adjacent light transmission portions 2 and 2 are combined. ) Of the tensile elastic modulus (based on JIS K 7161) is opposite. That is, in the light control panel 1, the light transmission part 2 in which the tensile modulus in the thickness direction is larger than the tensile modulus in the length direction, and the tensile modulus in the thickness direction is smaller than the tensile modulus in the length direction. The light transmissive portions 2 are alternately arranged.

[Installation of light control panel]
As shown in FIGS. 1 and 2, the light control panels 1, 1 (1A, 1B) are at least partially overlapped in a plan view, and the reflective layers 3, 3 (3A, 3B) cross each other in the overlapping region. They are placed facing each other. The light control panels 1A and 1B shown in FIG. 1 and FIG. 2 are arranged so that the entire areas overlap in a plan view, and the reflective layers 3A and 3B are orthogonal to each other.
An adhesive layer 7 is formed on one surface of the light control panels 1, 1 (1A, 1B) by applying an adhesive or the like. The light control panels 1, 1 (1A, 1B) are bonded by the adhesive layer 7.

[Installation of transparent protective layer]
Adhesive layers 8 and 8 are formed by applying a transparent adhesive or the like on the outer surface of the light control panel 1 or 1 (1A or 1B) or the surface of the transparent protective layer 6. The light control panels 1, 1 (1A, 1B) and the transparent protective layer 6 (6A, 6B) are bonded by the adhesive layers 8, 8. The transparent protective layer may be installed before the light control panel is installed. That is, after the transparent protective layer 6 (6A, 6B) is bonded to each of the light control panels 1A, 1B, the light control panels 1A, 1B may be bonded with the reflective layers 3A, 3B orthogonal to each other.
The optical imaging apparatus 10 shown in FIGS. 1 and 2 is obtained through the above steps.

According to the manufacturing method shown here, in the production of the multilayer laminate 19, the plurality of first laminates 18 includes the length direction D3 of at least one first laminate 18 and the other first laminates 18. Of these, at least one length direction D3 is arranged differently.
As described above, the transparent substrate 12 may have different physical properties in the length direction D1 and the width direction D2 due to the tension at the time of conveyance. According to this manufacturing method, some of the first laminated bodies 18 are used. When the length directions D <b> 3 are different from each other, an increase in the difference in physical properties can be avoided, and distortion generated in the multilayer laminate 19 can be suppressed. Therefore, the light control panel 1 with less distortion can be obtained. Therefore, the imaging quality can be improved in the optical imaging device 10.

  Further, when the multilayer stack 19 is manufactured, the first stack 18 is stacked so that the length directions D3 of the adjacent first stacks 18 are orthogonal to each other, so that the length direction D3 and the width direction D4 Since the difference in physical properties can be reduced, the aforementioned distortion can be further reduced, and the imaging quality in the optical imaging apparatus 10 can be further improved.

In the light control panel 1, the magnitude relationship between the tensile elastic modulus in the thickness direction and the length direction in at least one light transmission portion 2 is the same in the thickness direction and the length direction in at least one of the other light transmission portions 2. This is the opposite of the magnitude relationship of the tensile modulus. Therefore, distortion generated in the light control panel 1 can be reduced, and the imaging quality can be improved in the optical imaging apparatus 10.
In the light control panel 1, the light transmission part 2 in which the tensile modulus in the thickness direction is larger than the tensile modulus in the length direction, and the tensile modulus in the thickness direction is smaller than the tensile modulus in the length direction. Since the light transmission portions 2 are alternately arranged, the above-described distortion can be further reduced, and the imaging quality in the optical imaging apparatus 10 can be further improved.

The optical imaging device and the manufacturing method thereof according to the embodiment can be variously modified without departing from the spirit of the present invention.
In the light control panel 1 shown in FIG. 4, the reflective layer 3 includes the metal film 4 and the adhesive layer 5, but the reflective layer may be composed of only the metal film.
The light transmission part may be at least partially composed of a cured product of the allyl ester resin composition.
In the above-described manufacturing method, the metal films 14 are formed on both surfaces of the transparent substrate 12. However, if the reflective layer 3 can be formed between the adjacent light transmitting portions 2 in the light control panel 1, the metal film 14 is formed on the transparent substrate 12. You may form only in one side of 12. That is, if the adhesive layer 15 is colorless and transparent, the metal film 14 is formed only on one side of the transparent substrate 12, and the upper metal film 14 of each first laminate 18 in FIG. Can do. However, even in this case, the metal film 14 is required on both surfaces of the transparent substrate 12 on the uppermost surface and the lowermost surface in FIG.
In the above-described manufacturing method, some of the first laminated bodies 18 and the other part of the first laminated bodies 18 of the first laminated bodies 18 constituting the multilayer laminated body 19 have a length in plan view. Although the direction D3 is orthogonal to each other, the length direction D3 of some of the first stacked bodies 18 and the other part of the first stacked bodies 18 may be any direction that intersects.
“At least one of an allyl group and a methallyl group” means either one or both of an allyl group and a methallyl group. “At least one of light irradiation and heating” means either one or both of light irradiation and heating. “At least one of an alicyclic structure and an aromatic ring structure” means either one or both of an alicyclic structure and an aromatic ring structure.

  EXAMPLES Hereinafter, although a synthesis example, an Example, and a comparative example demonstrate this invention concretely, this invention is not limited by these description. The total light transmittance, pencil hardness and the like of the film and sheet can be measured by the following methods.

[Total light transmittance]
The total light transmittance was measured according to JIS K-7361-1, using a Nippon Denshoku Industries Co., Ltd. haze meter NDH5000.

[Haze]
The haze value was measured according to JIS K-7136 using a Nippon Denshoku Industries Co., Ltd. haze meter NDH5000.

[Abbe number]
Using a multi-wavelength Abbe refractometer DR-M4 manufactured by Atago Co., Ltd., the refractive index of C line (656 nm), D line (589 nm), and F line (486 nm) is measured. Was calculated.
νD = (nD−1) / (nF−nC)

[Pencil hardness]
The pencil hardness is an electric pencil scratch hardness tester No. 1 manufactured by Yasuda Seiki Kogyo Co., Ltd. 553-M was used and measured according to JIS K5600-5-4.

[specific gravity]
Specific gravity was measured by an underwater displacement method using an electronic hydrometer manufactured by Alpha Mirage. The size of the measurement sample was 50 mm × 50 mm × predetermined thickness mm, and the measurement temperature was 23 ° C.

[Arithmetic mean roughness (Ra)]
The arithmetic average roughness (Ra) was measured using a scanning probe microscope Nanocut manufactured by Hitachi High-Tech Co., Ltd.

[Elastic modulus]
The elastic modulus was measured using a tensile tester AG-I manufactured by Shimadzu Corporation according to JIS K7161-1.

Synthesis example 1:
A 2 liter three-necked flask equipped with a distillation apparatus is charged with 1625 g of diallyl 1,4-cyclohexanedicarboxylate, 247 g of trimethylolpropane, and 4.1 g of dioctyltin oxide, and allyl alcohol produced at 180 ° C. in a nitrogen stream. It heated while distilling out of the system. When the distilled allyl alcohol reached about 260 g, the pressure in the reaction system was gradually reduced to 6.6 kPa over 4 hours to increase the distillation rate of allyl alcohol. When almost no distillation occurred, the pressure was adjusted to 0.5 kPa, and the reaction was performed for 1 hour, followed by cooling to room temperature to obtain allyl ester oligomer A.

Production Example 1 (transparent substrate A):
10 parts by mass of trimethylolpropane triacrylate (manufactured by Toagosei Co., Ltd., “M-309”), 2,4,6-trimethylbenzoyl-diphenyl-phosphine with respect to 100 parts by mass of allyl ester oligomer A produced in Synthesis Example 1 0.5 parts by mass of oxide (manufactured by BASF Japan Ltd., “Irgacure (registered trademark) TPO”) and 1 part by mass of perhexyl (registered trademark) I (Nippon Oil Co., Ltd.) were added and stirred well to prepare allyl ester resin composition B. Obtained. The composition B was applied on a PET (polyethylene terephthalate) film so that the thickness after curing was 0.3 mm. The surface of the coating solution is covered with a PET cover film, irradiated with ultraviolet rays using an ultraviolet irradiation device (metal halide lamp) at 200 mW / cm ² and 800 mJ / cm ² , and then placed in a heating furnace set at 150 ° C. for 10 minutes. I put it in. The base film and the cover film were peeled off from the heating furnace, and a transparent substrate A having a thickness of 0.3 mm was obtained.

Production Example 2:
Aluminum was vapor-deposited on both surfaces of the transparent substrate A by a vacuum deposition method to obtain a substrate B having a thickness of 0.3 mm having an aluminum film (metal film) having a surface resistance value of 1.1 Ω / □. The average reflectance in the region of a wavelength of 380 to 780 nm on the aluminum vapor deposition surface of the substrate B was 91%.

<Example 1>
The base material B was cut into a sheet shape by a carbon dioxide laser to a size of 10 cm × 10 cm. The adhesive sheet EX4000 manufactured by Aron Alpha Co., Ltd. was used, and the obtained sheets were alternately laminated in a stack of 35 sheets so that the length directions of adjacent sheets in the thickness direction were orthogonal to each other in plan view (see FIG. 10). A laminate (multi-layer laminate) was produced. This laminated product was cut to a thickness of 1 mm using a diamond wire saw, and an about 10 cm × about 10 cm light control panel having metal film layers (reflection layers) at intervals of 0.3 mm was obtained.
Two sheets of this light control panel were produced, and UV curing resin SVR1120 manufactured by Dexialials Co., Ltd. was applied as an adhesive on one side. Two light control panels are stacked so that the metal film layers (reflection layers) are orthogonal to each other in plan view, and irradiated with ultraviolet rays using an ultraviolet irradiation device (metal halide lamp) at 200 mW / cm ² and 5000 mJ / cm ^2. Then, the adhesive was cured to obtain an optical imaging apparatus C.
The imaging quality of the optical imaging apparatus C was confirmed.

<Comparative Example 1>
The base material B was cut into a sheet shape by a carbon dioxide laser to a size of 10 cm × 10 cm. Using the adhesive EX4000 manufactured by Aron Alpha Co., Ltd., 35 sheets of the obtained sheets were stacked and bonded so that the length directions were the same, and a laminated product (multi-layer laminated body) was produced. This laminated product was cut to a thickness of 1 mm using a diamond wire saw, and an about 10 cm × about 10 cm light control panel having metal film layers (reflection layers) at intervals of 0.3 mm was obtained.
Two sheets of this light control panel were produced, and UV curing resin SVR1120 manufactured by Dexialials Co., Ltd. was applied as an adhesive on one side. Two light control panels are stacked so that the metal film layers (reflection layers) are orthogonal to each other in plan view, and irradiated with ultraviolet rays using an ultraviolet irradiation device (metal halide lamp) at 200 mW / cm ² and 5000 mJ / cm ^2. Then, the adhesive was cured to obtain an optical imaging apparatus D.
The imaging quality of the optical imaging device D was confirmed.

  As shown in Table 1, it was confirmed that the imaging quality of Example 1 was superior to that of Comparative Example 1.

DESCRIPTION OF SYMBOLS 1 Light control panel 2 Light transmissive part 3 Reflective layer 4 Metal film 4a Light reflective surface 10 Optical imaging device 12 Transparent base material 16 Band-shaped laminated body 17 Band-shaped laminated body with an adhesive layer 18 First laminated body 19 Multi-layer laminated body D3 ( Length direction D4 (of the first laminate) Width direction (of the first laminate)

Claims (7)

A step of producing a band-shaped transparent substrate capable of transmitting visible light, at least a part of which is a cured product of the allyl ester resin composition;
A step of forming a belt-like laminate by forming a reflective layer on at least one surface thereof while transporting the transparent substrate in the length direction;
Cutting the strip-shaped laminate into a predetermined length to obtain a plurality of first laminates;
Laminating a plurality of the first laminates to form a multilayer laminate;
By cutting the multilayer laminate along a plane intersecting the transparent substrate, the multilayer laminate is formed between the light transmitting portions adjacent to the plurality of light transmitting portions cut out from the transparent substrate. And a step of obtaining a light control panel having a light reflection surface that reflects visible light that passes through the light transmission part.
In the step of laminating the plurality of first laminated bodies to form a multilayer laminated body, at least one length direction of the plurality of first laminated bodies and at least one length of the other first laminated bodies. A method of manufacturing a light control panel in which the first stacked body is stacked so that the directions are different.   2. The step of laminating the plurality of first laminated bodies to form a multilayer laminated body, wherein the first laminated bodies are laminated so that the length directions of the adjacent first laminated bodies are orthogonal to each other. Method of manufacturing a light control panel. The allyl ester resin composition has the general formula (2)

(In the formula, R ³ represents an allyl group or a methallyl group, and A ² represents one or more organic residues having at least one of an alicyclic structure and an aromatic ring structure derived from dicarboxylic acid.) And a group represented by the general formula (3)

(In the formula, A ³ represents one or more organic residues derived from dicarboxylic acid and having at least one of an alicyclic structure and an aromatic ring structure, and X represents one or more organic derivatives derived from polyhydric alcohols. X represents an ester bond, and can have a branched structure having the general formula (2) as a terminal group and the general formula (3) as a constituent unit. The method for producing a light control panel according to claim 1, comprising an allyl ester oligomer as a structural unit.   The method for manufacturing a light control panel according to claim 1, wherein the reflective layer has a metal film made of a metal selected from aluminum, silver, and chromium. A plurality of light transmission parts capable of transmitting visible light, and a reflection layer formed between the adjacent light transmission parts,
The reflective layer has a light reflection surface that reflects visible light passing through the light transmission part,
The light transmission part is at least partially made of a cured product of an allyl ester resin composition, and the tensile elastic modulus in the thickness direction and the length direction is different,
The magnitude relationship between the tensile modulus in the thickness direction and the length direction in at least one of the plurality of light transmission portions is the tensile modulus in the thickness direction and the length direction in at least one of the other light transmission portions. Light control panel that is the opposite of the size relationship.   The light transmitting portion in which the tensile modulus in the thickness direction is larger than the tensile modulus in the length direction, and the light transmitting portion in which the tensile modulus in the thickness direction is smaller than the tensile modulus in the length direction. The light control panel according to claim 5 arranged alternately. At least a pair of the light control panels according to claim 5 or 6,
The pair of light control panels is an optical imaging device arranged so that at least a part of the pair of light control panels is overlapped when viewed from the thickness direction, and the reflection layers intersect in the overlap region.

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