JP2016057335A - Laminate, imaging device package, image acquisition apparatus, and electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate having excellent optical adjustment function.SOLUTION: This laminate includes a first layer having first asperities and a second layer having second asperities. The second asperities have an arithmetic average roughness of 0.1-48 μm inclusive, the first layer includes a plurality of structures constituting the first asperities, and the plurality of structures are provided on the second asperities at a pitch less than or equal to the wavelength of light for the purpose of reducing reflection and have a plurality of orientations.SELECTED DRAWING: Figure 1

Description

  The present technology relates to a stacked body, and an imaging element package, an imaging apparatus, and an electronic device including the same. Specifically, the present invention relates to a laminated body having an antireflection function, and an image pickup device package, an image pickup apparatus, and an electronic apparatus including the same.

  Conventionally, in the technical field of optical elements, various techniques for imparting an optical adjustment function to a surface have been proposed (for example, see Patent Document 1). One of those techniques is to form a subwavelength structure on the surface of the optical element. Here, the optical adjustment function refers to an optical adjustment function of transmission characteristics and / or reflection characteristics.

  In recent years, various studies have been made on the shape of the sub-wavelength structure in order to improve the optical adjustment function of the optical element described above. For example, Patent Document 2 proposes a technique in which a force is physically applied to the moth eye structure by rubbing to tilt and align the moth eye structure.

JP 2011-053495 A Japanese Patent No. 5108151

  Accordingly, an object of the present technology is to provide a laminate having an excellent optical adjustment function, and an image pickup device package, an image pickup apparatus, and an electronic apparatus including the same.

In order to solve the above-mentioned problem, the first technique is:
A first layer having first irregularities;
A second layer having second irregularities,
The arithmetic average roughness of the second unevenness is 0.1 μm or more and 48 μm or less,
The first layer includes a plurality of structures constituting the first unevenness,
The plurality of structures are stacked bodies that are provided on the second unevenness at a pitch equal to or less than the wavelength of light for the purpose of reducing reflection and have a plurality of orientations.

The second technology is
An image sensor;
Including a light-transmitting part and a package for accommodating an image sensor,
The translucent part is
A first layer having first irregularities;
A second layer having second irregularities,
The arithmetic average roughness of the second unevenness is 0.1 μm or more and 48 μm or less,
The first layer includes a plurality of structures constituting the first unevenness,
The plurality of structures are image pickup device packages that are provided on the second unevenness at a pitch equal to or less than the wavelength of light for the purpose of reducing reflection and have a plurality of orientations.

The third technology is
Optical system,
An image sensor package, and
At least one of the optical system and the image sensor package is
A first layer having first irregularities;
A second layer having second irregularities,
The arithmetic average roughness of the second unevenness is 0.1 μm or more and 48 μm or less,
The first layer includes a plurality of structures constituting the first unevenness,
The plurality of structures are imaging devices which are provided on the second unevenness with a pitch equal to or less than the wavelength of light for the purpose of reducing reflection and have a plurality of orientations.

The fourth technology is
Optical system,
An image sensor package, and
At least one of the optical system and the image sensor package is
A first layer having first irregularities;
A second layer having second irregularities,
The arithmetic average roughness of the second unevenness is 0.1 μm or more and 48 μm or less,
The first layer includes a plurality of structures constituting the first unevenness,
The plurality of structures are electronic devices that are provided on the second unevenness with a pitch equal to or less than the wavelength of light for the purpose of reducing reflection and have a plurality of orientations.

  As described above, according to the present technology, an excellent optical adjustment function can be realized.

FIG. 1A is a cross-sectional view illustrating an example of a configuration of an optical laminated body according to the first embodiment of the present technology. 1B is an enlarged cross-sectional view illustrating a part of the surface of the optical layered body illustrated in FIG. 1A. FIG. 2A is a schematic diagram for explaining the orientation direction of a structure having a convex shape with respect to the surface of the first layer. FIG. 2B is a schematic diagram for explaining the orientation direction of a structure having a concave shape with respect to the surface of the first layer. 3A to 3C are process diagrams for describing an example of a method for manufacturing an optical layered body according to the first embodiment of the present technology. 4A to 4C are process diagrams for explaining an example of a method for manufacturing an optical laminated body according to the first embodiment of the present technology. FIG. 5 is a cross-sectional view illustrating an example of the configuration of the optical layered body according to Modification Example 1 of the first embodiment of the present technology. FIG. 6A is a cross-sectional view illustrating an example of a configuration of a third layer of the optical layered body according to the second embodiment of the present technology. FIG. 6B is a cross-sectional view illustrating an example of the configuration of the second layer of the optical layered body according to the second embodiment of the present technology. FIG. 6B is a cross-sectional view illustrating an example of the configuration of the first layer of the optical layered body according to the second embodiment of the present technology. 7A to 7C are process diagrams for explaining an example of a method for manufacturing an optical layered body according to the second embodiment of the present technology. FIG. 8A is a cross-sectional view illustrating an example of a configuration of an optical laminated body according to the third embodiment of the present technology. FIG. 8B is an enlarged cross-sectional view illustrating a part of the surface of the optical layered body illustrated in FIG. 8A. FIG. 9A is a cross-sectional view illustrating an example of a configuration of an image sensor package according to a fourth embodiment of the present technology. FIG. 9B is a cross-sectional view illustrating an example of a configuration of an image sensor package according to a modification of the fourth embodiment of the present technology. FIG. 10 is a cross-sectional view illustrating an example of a configuration of a camera module according to the fifth embodiment of the present technology. FIG. 11 is a schematic diagram illustrating an example of a configuration of an imaging device according to the sixth embodiment of the present technology. FIG. 12 is a schematic diagram illustrating an example of a configuration of an imaging device according to the seventh embodiment of the present technology. FIG. 13 is a perspective view illustrating an example of an appearance of a first electronic device according to the eighth embodiment of the present technology. FIG. 14A is a perspective view illustrating an example of an appearance on the front surface side of a second electronic apparatus according to the eighth embodiment of the present technology. FIG. 14B is a perspective view illustrating an example of the appearance of the back surface side of the second electronic device according to the eighth embodiment of the present technology. FIG. 15A is a perspective view illustrating an example of an appearance on the front surface side of a third electronic apparatus according to the eighth embodiment of the present technology. FIG. 15B is a perspective view illustrating an example of the appearance of the back surface side of the third electronic device according to the eighth embodiment of the present technology. FIG. 16 is a diagram showing measurement results of loss elastic modulus and storage elastic modulus of the first layer and the second layer of the optical layered body of Example 1.

Embodiments of the present technology will be described in the following order.
1 1st Embodiment (example of an optical laminated body)
1.1 Configuration of Optical Laminated Body 1.2 Manufacturing Method of Optical Laminated Body 1.3 Effect 1.4 Modification 2 Second Embodiment (Example of Optical Laminated Body)
2.1 Configuration of Optical Laminated Body 2.2 Manufacturing Method of Optical Laminated Body 2.3 Effects 2.4 Modification 3 Third Embodiment (Example of Optical Laminated Body)
3.1 Configuration of Optical Laminated Body 3.2 Modification 4 Fourth Embodiment (Example in which optical laminated body is applied to imaging device package)
5 Fifth Embodiment (Example in which an optical laminate is applied to an imaging device)
6 Sixth Embodiment (Example in which an optical laminate is applied to an imaging device)
7 Seventh Embodiment (Example in which optical laminated body is applied to digital video camera)
8 Eighth Embodiment (Example in which optical laminate is applied to electronic device)

<1. First Embodiment>
[1.1 Structure of optical laminate]
Hereinafter, an example of the configuration of the optical laminated body 10 according to the first embodiment of the present technology will be described with reference to FIGS. 1A and 1B. The optical laminated body 10 includes a first layer 11 having a first unevenness 11s and a second layer 12 having a second unevenness 12s. The first layer 11 is provided on the second unevenness 12 s of the second layer 12. In FIGS. 1A and 1B, an arrow n indicates the normal direction of a plurality of curved surfaces and / or planes constituting the second unevenness 12s.

  The first unevenness 11s is for reducing light reflection, and the second unevenness 12s is for imparting orientation to the first unevenness 11s. The optical laminated body 10 has transparency. Here, the transparency is, for example, transparency to at least one kind of light among ultraviolet light, visible light, and infrared light. In the present technology, ultraviolet light is light in a wavelength band of 10 nm to less than 350 nm, visible light is light in a wavelength band of 350 nm to 850 nm, and infrared light is light in a wavelength band of more than 850 nm to 1 mm or less. Say.

  On the surface of the first layer 11 on the first unevenness 11s side, between the first layer 11 and the second layer 12, or on the surface of the second layer 12 opposite to the second unevenness 12s, A refractive index adjusting layer may be further provided. In addition, an adhesion improving process may be performed between the first layer 11 and the second layer 12.

  Applicable objects of the optical laminate 10 include, for example, a light guide material provided with an arbitrary light extraction shape, a polarization control optical element, a window material such as an image sensor cover glass, a filter such as a camera ND filter, and a camera. Examples thereof include, but are not limited to, optical elements such as lenses such as lenses for use, transflective mirrors, light control elements, prisms, and display front plates. Moreover, you may use the optical laminated body 10 as a low reflection light transmissive layer which can maintain a low reflectance also with respect to a microlens array and low angle incident light, for example.

  Hereinafter, the first layer 11 and the second layer 12 included in the optical laminate 10 will be sequentially described.

(First layer)
The first layer 11 is transparent to light and has first irregularities 11s on the surface. The first unevenness 11s is an unevenness finer than the second unevenness 12s, and has a nano-order pitch, for example. More specifically, the 1st unevenness | corrugation 11s is comprised by the some 1st structure 11a arranged two-dimensionally on the surface of the 2nd unevenness | corrugation 12s.

  The first layer 11 is an antireflection layer having an antireflection function. The first layer 11 includes a structural layer including a plurality of first structural bodies 11a. The first layer 11 may further include an intermediate layer (optical layer) 11 b provided between the structural layer including the plurality of first structural bodies 11 a and the second layer 12. The plurality of first structures 11a are not limited to the configuration provided on the entire surface of the second unevenness 12s, but are selectively provided in a portion such as the top of the second unevenness 12s. May be.

  The first structure 11a is a so-called sub-wavelength structure. The first structure 11 a has a convex shape or a concave shape with respect to the surface of the first layer 11. Note that FIG. 1B shows an example in which the first structure 11a has a convex shape. The plurality of first structures 11a are arranged at a pitch P equal to or less than the wavelength band of light for the purpose of reducing reflection, and have a plurality of orientations. Here, the wavelength band of light for the purpose of reducing reflection is, for example, the wavelength band of ultraviolet light, the wavelength band of visible light, or the wavelength band of infrared light. The wavelength band of ultraviolet light is a wavelength band of 10 nm or more and less than 350 nm, the wavelength band of visible light is a wavelength band of 350 nm or more and 850 nm or less, and the wavelength band of infrared light is a wavelength band of more than 850 nm and 1 mm or less. The aspect ratio (height / arrangement pitch) of the first structure 11a is preferably in the range of 0.81 to 1.46, more preferably 0.94 to 1.28. If the ratio is less than 0.81, the reflection characteristics and the transmission characteristics tend to be lowered. If the ratio exceeds 1.46, the peeling characteristics are lowered during the formation of the first structure 11a, and the replica cannot be reproduced neatly. Because there is.

  The orientation direction of the plurality of first structures 11a is preferably substantially perpendicular to the plurality of curved surfaces and / or planes constituting the second unevenness 12s. However, the orientation direction of the plurality of first structures 11a provided in the top and valley portions of the second unevenness 12s is excluded. By making the alignment direction substantially vertical as described above, the alignment directions of the plurality of structures 11a can be accurately set by adjusting the shape of the second unevenness 12s of the second layer 12. Here, as shown in FIG. 2A and FIG. 2B, the term “substantially perpendicular” refers to the orientation direction m of the first structure 11a and the normal direction n of the plurality of curved surfaces and / or planes constituting the second unevenness 12s. It means that the angle θ formed by is within ± 10 °. 2A shows an example in which the first structure 11a has a convex shape with respect to the surface of the first layer 11, and FIG. 2B shows the first structure 11a with respect to the surface of the first layer 11. An example having a concave shape is shown. In addition, a plurality of first structures 11a in which the orientation direction m exceeds ± 10 ° may be included in a part as long as the antireflection characteristic is not deteriorated.

  When the first structure 11a has a convex shape with respect to the surface of the first layer 11, the orientation direction of the first structure 11a is as shown in FIG. 2A. This is the direction from the center Pc of the bottom surface toward the vertex Pt. On the other hand, when the first structure 11a has a concave shape with respect to the surface of the first layer 11, as shown in FIG. 2B, the direction from the vertex Pt of the first structure 11a to the center Pc of the bottom surface It is.

  For example, the plurality of first structures 11 a are arranged in a plurality of rows on the surface of the second layer 12. The row may have either a linear shape or a curved shape. A plurality of rows in a part of the surface of the second layer 12 may be linear, and a plurality of rows in other regions may be curved. Examples of the curve include a curve meandering periodically or aperiodically. Examples of such curves include waveforms such as sine waves and triangular waves, but are not limited thereto.

  The arrangement of the plurality of first structures 11a on the surface of the second layer 12 may be either a regular arrangement or an irregular arrangement. As the regular arrangement, a lattice arrangement such as a tetragonal lattice, a quasi-tetragonal lattice, a hexagonal lattice, or a quasi-hexagonal lattice is preferable. Here, the tetragonal lattice means a regular tetragonal lattice. A quasi-tetragonal lattice means a distorted regular tetragonal lattice unlike a regular tetragonal lattice. The hexagonal lattice means a regular hexagonal lattice. The quasi-hexagonal lattice means a distorted regular hexagonal lattice unlike a regular hexagonal lattice.

  Specific examples of the shape of the first structure 11a include a cone shape, a column shape, a needle shape, a hemispherical shape, a semi-ellipsoidal shape, and a polygonal shape, but are limited to these shapes. Instead, other shapes may be employed. Examples of the cone shape include a cone shape with a sharp top, a cone shape with a flat top, and a cone shape with a convex or concave curved surface at the top, but are not limited to these shapes. is not. Examples of the cone shape having a convex curved surface at the top include a quadric surface shape such as a parabolic shape. Further, the cone-shaped cone surface may be curved concavely or convexly.

  The plurality of first structures 11a provided on the surface of the second layer 12 may all have the same size, shape and height, or the plurality of first structures 11a Those having different sizes, shapes or heights may be included. Moreover, the some 1st structure 11a may contain what is connected so that lower parts may overlap.

  The thickness d of the structural layer is, for example, not less than 100 nm and not more than 400 nm. The thickness D of the intermediate layer 11b is, for example, not less than 50 nm and not more than 16000 nm. Here, the thickness d of the structure layer means the height of the first structure 11a when the first structure 11a is convex, and the first structure 11a is concave. In the case, it means the depth of the first structure 11a. Further, the thickness D of the intermediate layer 11b means the distance from the surface of the second layer 12 to the deepest position of the valley portion between the adjacent first structures 11a.

  The ratio R (= (D / d) × 100) of the thickness D of the intermediate layer 11b to the thickness d of the structural layer is preferably in the range of 50% to 4000%, more preferably 150% to 4000%. is there. When the thickness d of the structural layer is in the range of about 100 nm to about 400 nm, if the ratio R is out of the range of 50% to 4000%, the alignment process becomes difficult. More specifically, when the ratio R is less than 50%, the first structure 11a is broken from the root during the transfer process of the second structure 12a described later (that is, during the alignment process). It becomes difficult to orient the first structure 11a. On the other hand, if the ratio R exceeds 4000%, the intermediate structure 11a is broken during the transfer process of the second structure 12a described later (that is, during the alignment process), and the first structure 11a is aligned. It becomes difficult to make.

(Second layer)
The second layer 12 is transparent to light and has second irregularities 12s on the surface. The second unevenness 12s is an unevenness larger than the first unevenness, and has, for example, a micro-order pitch. The 2nd unevenness | corrugation 12s is a lens pattern (for example, micro lens pattern) which has directivity (for example, condensing property). The second unevenness 12s is constituted by a plurality of second structures 12a arranged one-dimensionally or two-dimensionally on the surface of the second layer 12. The second structural body 12 a has a convex shape or a concave shape with respect to the surface of the second layer 12. FIG. 1A shows an example in which the second structure 12a has a convex shape. The arrangement of the plurality of second structures 12a on the surface of the second layer 12 may be either a regular arrangement or an irregular arrangement. Irregularity may be imparted to the size and shape of the second structure 12a.

  The second structure 12a has a curved surface and / or a planar side surface. Here, the side surface refers to a surface excluding a top portion of the second structure 12a and a portion between the adjacent second structures 12a. The orientation direction of the plurality of first structures 11a is preferably substantially perpendicular to the side surface of the second structure 12a.

  The second structures 12a arranged one-dimensionally are columnar structures extending in one direction, for example. The plurality of second structures 12 a having a columnar shape are arranged one-dimensionally in one direction on the surface of the second layer 12. Examples of the shape of the second structures 12a arranged one-dimensionally include a lenticular shape such as a prism shape, a shape obtained by rounding the top of the prism shape, and a cylindrical shape. Here, the lenticular shape means that the cross-sectional shape perpendicular to the ridge line of the convex portion is an arc shape or a substantially arc shape, an elliptic arc shape or a substantially elliptic arc shape, or a part of a parabolic shape or a substantially parabolic shape. Therefore, a cylindrical shape is also included in the lenticular shape. The ridge line portion may have a curvature R. The shape of the second structures 12a arranged one-dimensionally is not limited to the shape described above, and may be a toroidal shape, a hyperbolic column shape, an elliptical column shape, a polygonal column shape, or a free-form surface shape. Also, the apex of the prism shape and the lenticular shape may be a polygonal shape.

  Examples of the shape of the second structures 12a arranged two-dimensionally include a corner cube shape, a hemispherical shape, a semi-elliptical spherical shape, a prism shape, a free-form surface shape, a polygonal shape, a conical shape, a polygonal pyramid shape, a truncated cone shape, Examples include a parabolic shape. The bottom surface of the second structure 12a has, for example, a circular shape, an elliptical shape, or a polygonal shape such as a triangular shape, a quadrangular shape, a hexagonal shape, or an octagonal shape.

  Note that the configuration and arrangement of the second structures 12a are not limited to the above example. For example, a plurality of second structures 12a extending in a circular shape may be arranged concentrically. A specific example of such a shape is a Fresnel lens.

  The arrangement of the second structures 12a is preferably an arrangement in the closest packed state. For example, a dense array such as a square dense array, a delta dense array, or a hexagonal dense array may be formed by two-dimensionally arranging the second structures 12a on the surface of the second layer 12 in the most densely packed state. . In the square dense array, the second structures 12a having a square bottom surface are arranged in a square dense form. In the delta dense array, the second structures 12a having a triangular bottom surface are arranged in a hexagonal dense form. The hexagonal close-packed array is obtained by arranging second structures 12a having hexagonal bottom surfaces in a hexagonal close-packed shape.

  The second layer 12 has transparency. As the material of the second layer 12, either an organic material or an inorganic material may be used. Examples of the inorganic material include quartz, sapphire, and glass. As the organic material, for example, a general polymer material can be used. Specific examples of the general polymer material include triacetyl cellulose (TAC), polyester (TPEE), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polyimide (PI), polyamide (PA), Aramid, polyethylene (PE), polyacrylate, polyether sulfone, polysulfone, polypropylene (PP), diacetyl cellulose, polyvinyl chloride, acrylic resin (PMMA), polycarbonate (PC), epoxy resin, urea resin, urethane resin, melamine Resins, cycloolefin polymers (COP), cycloolefin copolymers and the like.

  When an organic material is used as the material of the second layer 12, an undercoat layer is provided as a surface treatment in order to improve the surface energy, coatability, slipperiness and flatness of the surface of the second layer 12. Also good. Examples of the material for the undercoat layer include organoalkoxy metal compounds, polyesters, acrylic-modified polyesters, and polyurethanes. Further, in order to obtain the same effect as that of providing the undercoat layer, the surface of the second layer 12 may be subjected to a surface treatment such as corona discharge or UV irradiation treatment.

  Examples of the shape of the second layer 12 include a film shape, a plate shape, and a block shape, but are not particularly limited to these shapes. Here, the film shape is defined to include a sheet shape. The thickness of the second layer 12 is, for example, about 25 μm to 500 μm. When the second layer 12 is a plastic film, the second layer 12 is obtained by, for example, a method of stretching the above-mentioned resin or diluting with a solvent, forming a film, and drying the film. Can do. The second layer 12 may be a component such as a member or an apparatus to which the optical laminate 10 is applied.

  The arithmetic average roughness Ra of the second unevenness is preferably 0.1 μm or more and 48 μm or less. When the arithmetic average roughness Ra is less than 0.1 μm, it is difficult to adjust the orientation direction of the first structure 11a due to the second unevenness 12s of the second layer 12, and reflection with respect to incident light is reflected. There exists a tendency for the prevention effect to fall. On the other hand, when the arithmetic average roughness Ra exceeds 48 μm, the antireflection effect tends to decrease due to the second layer 12 breaking or the like.

[1.2 Manufacturing method of optical laminate]
Next, an example of a method for manufacturing the optical laminate 10 according to the first embodiment of the present technology will be described with reference to FIGS. 3A to 4C.

(First master preparation process)
First, as shown in FIG. 3A, a first master 21 having a molding surface 21s as one main surface is prepared. The molding surface 21s is a concavo-convex surface and includes a plurality of structures 21a arranged two-dimensionally. The structure 21a has, for example, a concave shape or a convex shape with respect to one main surface of the first master 21. The plurality of structures 21a constituting the molding surface 21s and the plurality of first structures 11a constituting the first unevenness 11s described above have substantially the same shape, and the inverted unevenness relationship. It is in.

  As a material of the first master 21, for example, silicon, glass, metal, or the like can be used. However, the material is not particularly limited to these materials. As a method for producing the first master 21, a method in which photolithography, anodic oxidation, an optical disc master production process and an etching process are combined (for example, see Patent Document 1) can be used. Further, a duplicate master may be produced from the first master 21 by electroforming and used.

(First transfer process)
Next, as shown in FIG. 3B, the transfer material 24 is applied to the surface of the second layer 12, and the shape of the molding surface 21 s of the first master 21 is transferred to the transfer material 24. Thereby, as shown in FIG. 3C, the first layer 11 is formed on the surface of the second layer 12.

  The specific transfer method varies depending on the type of the transfer material 24. For example, when the transfer material 24 is an energy ray curable resin composition, the first master 21 and the transfer material 24 applied on the second layer 12 are brought into close contact with each other, and energy rays such as ultraviolet rays are applied. The transfer material 24 is irradiated from the energy ray source 25 to be cured. Thereafter, the second layer 12 integrated with the cured transfer material 24 is peeled off. When the transfer material 24 is a thermosetting resin, the first master 21 and the transfer material 24 applied onto the second layer 12 are brought into close contact with each other, and the transfer material 24 is heated by a heat source such as a heater. Thus, the transfer material 24 is cured. Thereafter, the second layer 12 integrated with the cured transfer material 24 is peeled off.

  The energy ray source 25 can emit energy rays such as electron beam, ultraviolet ray, infrared ray, laser beam, visible ray, ionizing radiation (X ray, α ray, β ray, γ ray, etc.), microwave, or high frequency. There is no particular limitation as long as it is sufficient.

  As the transfer material 24, an energy ray curable resin composition or a thermosetting resin is preferably used, and these may be used in combination. Examples of the energy ray curable resin composition and the thermosetting resin include acrylic resin, methacrylic resin, urethane resin, epoxy (oxetane) resin, siloxane resin, thiol resin, macromer having hyperbranched structure, polysilane, silazane, Silsesquioxane or the like can be used. These blending amounts are preferably selected as appropriate in consideration of the elastic modulus of the first layer 11. The transfer material 24 may contain a filler, a functional additive, etc. as needed.

  As the energy ray curable resin composition, an ultraviolet curable resin composition is preferably used. For example, an acrylic or epoxy ultraviolet curable resin composition can be used. The ultraviolet curable resin composition contains, for example, an acrylate and an initiator. The ultraviolet curable resin composition includes, for example, a monofunctional monomer, a bifunctional monomer, a polyfunctional monomer, and the like. Specifically, the ultraviolet curable resin composition is a single material or a mixture of the following materials.

  Monofunctional monomers include, for example, carboxylic acids (acrylic acid), hydroxys (2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 4-hydroxybutyl acrylate), alkyl, alicyclics (isobutyl acrylate, t-butyl acrylate) , Isooctyl acrylate, lauryl acrylate, stearyl acrylate, isobornyl acrylate, cyclohexyl acrylate), other functional monomers (2-methoxyethyl acrylate, methoxyethylene crycol acrylate, 2-ethoxyethyl acrylate, tetrahydrofurfuryl acrylate, benzyl acrylate, Ethyl carbitol acrylate, phenoxyethyl acrylate, N, N-dimethylaminoethyl acrylate, N, N- Dimethylaminopropylacrylamide, N, N-dimethylacrylamide, acryloylmorpholine, N-isopropylacrylamide, N, N-diethylacrylamide, N-vinylpyrrolidone, 2- (perfluorooctyl) ethyl acrylate, 3-perfluorohexyl-2- Hydroxypropyl acrylate, 3-perfluorooctyl-2-hydroxypropyl acrylate, 2- (perfluorodecyl) ethyl acrylate, 2- (perfluoro-3-methylbutyl) ethyl acrylate), 2,4,6-tribromophenol acrylate, 2 , 4,6-tribromophenol methacrylate, 2- (2,4,6-tribromophenoxy) ethyl acrylate), 2-ethylhexyl acrylate, etc. Yes.

  Examples of the bifunctional monomer include tri (propylene glycol) diacrylate, trimethylolpropane diallyl ether, urethane acrylate, and the like.

  Examples of the polyfunctional monomer include trimethylolpropane triacrylate, dipentaerythritol penta and hexaacrylate, and ditrimethylolpropane tetraacrylate.

  Examples of the initiator include 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxy-cyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, and the like. Can be mentioned.

As the filler, for example, both inorganic fine particles and organic fine particles can be used. Examples of the inorganic fine particles include metal oxide fine particles such as SiO ₂ , TiO ₂ , ZrO ₂ , SnO ₂ , and Al ₂ O ₃ .

  Examples of the functional additive include a leveling agent, a surface conditioner, and an antifoaming agent.

  The molding method of the second layer 12 is not particularly limited, and may be an injection molded body, an extruded molded body, or a cast molded body. If necessary, surface treatment such as corona treatment may be applied to the surface of the second layer 12.

  The material of the second layer 12 is not particularly limited as long as it is a resin material having heat softening properties. Examples of the resin material having thermosoftening properties include thermoplastic resins and low-melting glass. You may use what mixed porous material, microparticles | fine-particles, etc. in those resin materials.

(Second master preparation process)
Next, as shown in FIG. 4A, a second master 22 having a molding surface 22s as one main surface is prepared. The molding surface 22s is a concavo-convex surface and includes a plurality of structures 22a arranged one-dimensionally or two-dimensionally. The structure 22a has, for example, a concave shape or a convex shape with respect to one main surface of the second master 22. The plurality of structures 22a constituting the molding surface 22s and the plurality of second structures 12a constituting the second irregularities 12s have substantially the same shape and have an inverted irregularity relationship. .

  As a material of the second master 22, for example, silicon, glass, metal, or the like can be used, but the material is not particularly limited to these materials. As a method for manufacturing the second master 22, photolithography, cutting (for example, hairline processing), or the like can be used. Further, a duplicate master may be produced from the second master 22 by electroforming and used.

(Second transfer step)
Next, as shown in FIG. 4B, the second master 22 is pressed against the first irregularities 11 s of the first layer 11 while being heated, and the shape of the molding surface 22 s is transferred to the second layer 12. Thereby, as shown to FIG. 4C, the target optical laminated body 10 is obtained. Next, if necessary, the optical laminate 10 may be cut into a desired size.

  The elastic modulus of the first layer 11 is preferably higher than the elastic modulus of the second layer 12 at the transfer temperature in the second transfer step. In the second transfer step, it is possible to suppress the shape of the first unevenness 11s (that is, the shape of the first structure 11a) from collapsing due to sticking occurring in the first unevenness 11s. Therefore, the antireflection function of the first layer 11 can be maintained even after the second transfer step. Here, the transfer temperature in the second transfer step means the temperature of the molding surface 22s of the second master 22 at the time of shape transfer.

  The softening point of the second layer 12 is preferably lower than the softening point of the first layer 11. This is because it can be suppressed that the shape of the first structure 11a is deformed by sticking or the like and the antireflection characteristic of the first layer 11 is deteriorated.

[1.3 Effect]
In the first embodiment, since the orientation of the plurality of first structures 11a is adjusted by the second unevenness 12s of the second layer 12, an optical laminate 10 having an excellent optical adjustment function is obtained. Can do.

  In the first embodiment, the first layer 11 having the first unevenness 11 s is formed on the surface of the second layer 12 by curing the first master 21 while pressing it against the transfer material 24. Then, the second master 22 is pressed against the first unevenness 11 s while being heated, so that the second unevenness 12 s is applied to the surface of the second layer 12. Therefore, the orientation of the first structure 11a can be controlled by selecting the shape of the molding surface 22s of the second master 22 according to the orientation direction desired to be imparted to the first structure 11a.

  In the first embodiment, the first structure 11a is not oriented by physically applying force to the first structure 11a by rubbing or the like, but is transferred by shape transfer by the second master 22. The structure 11a is oriented. Therefore, even when a resin material having a high glass transition point Tg is used as the material of the first structure 11a, the micro-order orientation can be patterned without causing the first structure 11a to be bent.

More precise when orienting the moth-eye structure of the anti-reflection film to impart diffusibility to the anti-reflection film or when applying the moth-eye structure to a lens or waveguide having a major surface with a large light incident angle. Orientation control is required. However, with the alignment control technique described in Patent Document 2 or the like, precise alignment control is difficult.
On the other hand, in the first embodiment, after forming the plurality of first structures 11a on the surface of the second layer 12 in the first transfer step, the second layer 12 in the second transfer step. A plurality of first structures 11a are oriented by providing irregularities on the surface. Therefore, it is possible to perform precise orientation control with respect to the first structure 11a by selecting the concavo-convex shape imparted in the second transfer step.

Further, in the orientation control technique described in Patent Document 2 or the like, when a hard moth-eye structure is formed using a resin material having a high glass transition point Tg, the moth-eye structure is broken during rubbing, and the moth-eye structure is It cannot be oriented. For this reason, a moth-eye structure is formed using a resin material having a relatively low glass transition point Tg. However, in this case, sticking or the like is likely to occur in the moth-eye structure, and the antireflection effect is lowered.
On the other hand, in the first embodiment, when the elastic modulus of the first layer 11 at the transfer temperature in the second transfer step is set higher than the elastic modulus of the second layer 12, the first It is possible to suppress a decrease in the antireflection effect due to sticking occurring in the structure 11a.

  In the first embodiment, the second transfer step for imparting the second unevenness 12s to the second layer 12 is performed last, so that a concave portion that cannot be realized by the rubbing process described in Patent Document 2 or the like is obtained. On the other hand, an alignment treatment can be performed. Further, the antireflection effect of the first structure 11a can be imparted to a functional shape such as a lens shape or a micro shape.

[1.4 Modification]
(Modification 1)
As shown in FIG. 5, the optical laminate 10 may be provided on the surface of the substrate 31. In this case, the optical laminated body 10 may be directly provided on the surface of the base material 31, or the adhesive layer 32 may be provided between the optical laminated body 10 and the base material 31, and the two may be bonded together. As the adhesive constituting the adhesive layer 32, for example, one or more selected from the group consisting of acrylic adhesives, silicone adhesives, urethane adhesives, and the like can be used. In the present technology, pressure sensitive adhesion is defined as a kind of adhesion. According to this definition, the adhesive layer is regarded as a kind of adhesive layer. The base material 31 has transparency, for example. As a material of the base material 31, the same material as the above-mentioned 2nd layer 12 can be illustrated.

(Modification 2)
In the first embodiment described above, the configuration in which the optical layered body 10 has transparency to light has been described as an example, but the optical layered body 10 may have light absorptivity. Here, the light absorptivity is, for example, a light absorptivity for at least one of ultraviolet light, visible light, and infrared light. In this case, at least one of the first layer 11 and the second layer 12 includes, for example, a light-absorbing material. From the viewpoint of improving the light absorption, the first layer 11 and the second layer It is preferable that both of the twelve layers contain a light absorbing material. As the light-absorbing material, for example, at least one of a black colorant, an ultraviolet absorber, and an infrared absorber can be used. The optical layered body 10 is, for example, a low reflection light absorbing layer that can maintain a low reflectance even with respect to low-angle incident light.

  Examples of the black colorant include carbon black, titanium black, graphite, iron oxide, and titanium oxide, but are not particularly limited to these materials. Among these, carbon black, titanium black, and graphite are preferable, and carbon black is more preferable. These may be used in combination of two or more in addition to being used alone.

  As carbon black, for example, commercially available carbon black can be used. Specifically, for example, # 980B, # 850B, MCF88B, # 44B manufactured by Mitsubishi Kasei, BP-800, BP-L, REGAL-660, REGAL-330 manufactured by Cabot, and Raven- manufactured by Colombian Carbon. 1255, RAVEN-1250, RAVEN-1020, RAVEN-780, RAVEN-760, Printex-55, Printex-75, Printex-25, Printex-45, SB-550 manufactured by Degussa. These can be used alone or in combination.

(Modification 3)
After the second transfer step, a third master having a flat surface or the like is pressed against the first layer 13 while heating, and the shape of the second unevenness 12s of the second layer 12 is adjusted, or the second You may make it further provide the process of returning the 2nd unevenness | corrugation 12s of the layer 12 to substantially planar shape.

<2. Second Embodiment>
[2.1 Structure of optical laminate]
Hereinafter, an example of the configuration of the optical laminated body 30 according to the second embodiment of the present technology will be described with reference to FIGS. 6A to 6C. The optical layered body 30 according to the second embodiment further includes a third layer 13 having third unevenness 13s, and the second layer 12 is provided on the third unevenness 13s. This is different from the optical laminated body 10 according to the first embodiment. Note that in the second embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  Specifically, as shown in FIG. 6A, the second layer 12 is provided on the third unevenness 13 of the third layer 13, and as shown in FIG. 6B, the first layer 11 is the second layer 12. Is provided on the second unevenness 12s of the layer 12. Then, as shown in FIG. 6C, the first layer 11 constitutes the outermost surface of the optical laminate 30. In FIG. 6A, the third unevenness 13s is a prism-shaped uneven pattern, in FIG. 6B, the second unevenness 12s is a corner cube-shaped uneven pattern, and in FIG. 6C, the first unevenness 11s is a cone. The example which is a body-shaped uneven | corrugated pattern is shown.

  The third layer 13 is transparent to light and has third irregularities 13s on the surface. The third unevenness 13s is an unevenness larger than the second unevenness, and has a micro-order pitch, for example. The third unevenness 13s is a lens pattern (for example, a microlens pattern) having directivity (for example, light condensing property). The third unevenness 13 s is configured by a plurality of third structures 13 a that are one-dimensionally or two-dimensionally arranged on the surface of the third layer 13. The third structure 13 a has a convex shape or a concave shape with respect to the surface of the third layer 13. An example of the shape of the third structure 13a is the same as that of the second structure 12a. FIG. 6A shows an example in which the third structure 13a has a convex shape. 6B shows an example in which the second structure 12a has a concave shape, and FIG. 6C shows an example in which the first structure 11a has a convex shape.

[2.2 Manufacturing Method of Optical Laminate]
The manufacturing method of the optical layered body 30 according to the second embodiment of the present technology is the same as the first embodiment in that it further includes a third master preparation step and a third transfer step after the second transfer step. It differs from the manufacturing method of the optical laminated body 10 which concerns. Accordingly, only the third master preparation step and the third transfer step will be described below.

(Third master preparation process)
First, as shown in FIG. 7A, a third master 23 having a molding surface 23s on one main surface is prepared. The molding surface 23s is an uneven surface, and is composed of a plurality of structures 23a arranged one-dimensionally or two-dimensionally. The structure 23a has a concave shape or a convex shape with respect to one main surface of the third master 23, for example. The plurality of structures 23a constituting the molding surface 23s and the plurality of third structures 13a constituting the third unevenness 13s have substantially the same shape and have an inverted unevenness relationship.

  As the material of the third master 23, for example, silicon, glass, metal, or the like can be used. However, the material is not particularly limited to these materials. As a method for manufacturing the third master 23, photolithography, cutting (for example, hairline processing), or the like can be used. Further, a duplicate master may be produced from the third master 23 by electroforming and used.

(Third transfer step)
Next, as shown in FIG. 7B, the third master 23 is pressed against the third layer 13 while being heated, and the shape of the molding surface 23 s is transferred to the third layer 13. Thereby, as shown in FIG. 7C, the target optical laminated body 30 is obtained.

  The elastic modulus of the first layer 11 and the second layer 12 at the transfer temperature in the third transfer step is preferably higher than the elastic modulus of the third layer 13. This is because even if the first layer 11 and the second layer 12 are heated and pressed in the third transfer step, the shapes of the first unevenness 11s and the second unevenness 12s can be prevented from being broken. Therefore, even after the third transfer step, the antireflection function of the first layer 11 can be maintained, and the optical characteristics (for example, directivity such as light condensing property) of the second unevenness 12s can be maintained. Here, the transfer temperature in the third transfer step means the temperature of the molding surface 23s of the third master 23 during shape transfer.

[2.3 Effect]
In the second embodiment, the orientation of the plurality of first structures 11 a included in the first layer 11 is set so that the second irregularities 12 s of the second layer 12 and the third irregularities 13 s of the third layer 13 are obtained. Therefore, it is possible to control the orientation more precisely than in the first embodiment.

[2.4 Modification]
(Modification 1)
The optical laminate 30 may be provided on the surface of the substrate. In this case, the optical laminated body 30 may be directly provided on the surface of the base material, or an adhesive layer may be provided between the optical laminated body 30 and the base material, and the two may be bonded together.

(Modification 2)
In the first embodiment described above, the configuration in which the optical layered body 30 is transparent to light has been described as an example. However, the optical layered body 30 may have light absorptivity. In this case, at least one of the first layer 11, the second layer 12, and the third layer 13 includes, for example, a light-absorbing material.

<3. Third Embodiment>
[3.1 Configuration of optical laminate]
Hereinafter, an example of the configuration of the optical laminated body 40 according to the third embodiment of the present technology will be described with reference to FIGS. 8A and 8B. The optical layered body 40 according to the third embodiment has a second unevenness 41s having diffusivity instead of the second unevenness 12s (see FIG. 1A) having directivity (for example, light collecting property). This is different from the optical laminate 10 according to the first embodiment in that the layer 41 is provided. Note that in the third embodiment, the same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  The optical laminated body 40 is, for example, a directional light diffusion film, an antiglare film having a low reflection function, or the like. The second unevenness 41s may be a regular or irregular uneven pattern. As the second layer 41, for example, an antiglare layer (antiglare layer) can be used.

[3.2 Modification]
(Modification 1)
The optical laminate 40 may be provided on the surface of the substrate. In this case, the optical laminated body 40 may be directly provided on the surface of the base material, or an adhesive layer may be provided between the optical laminated body 40 and the base material, and the two may be bonded together.

(Modification 2)
In the first embodiment described above, the configuration in which the optical laminate 40 has transparency to light has been described as an example, but the optical laminate 40 may have light absorption. In this case, at least one of the first layer 11 and the second layer 41 includes, for example, a light absorbing material.

<4. Fourth Embodiment>
As shown in FIG. 9A, an image sensor package (hereinafter referred to as “element package”) 114a according to the fourth embodiment of the present technology includes a package 121, an image sensor 122 accommodated in the package 121, and a package 121. The translucent part 123a fixed so as to cover the open window is provided.

The translucent portion 123 a includes a cover glass (cover body) 124 that is a base material, and an optical laminate 125 provided on the surface of the cover glass 124. The optical laminate 125 is the optical laminate 10 according to the first embodiment, the optical laminate 30 according to the second embodiment, or the optical laminate 40 according to the third embodiment. The cover glass 124 has a front surface (first surface) 124s _{1 on} which light from a subject is incident and a back surface (second surface) 124s ₂ on which light incident from the front surface is emitted. The optical laminated body 125 is provided on _one of the front surface 124s ₁ and the back surface 124s ₂ and is preferably provided on both of them from the viewpoint of improving the antireflection characteristics and the transmission characteristics. FIG. 9A shows an example in which the optical laminated body 125 is provided only on the front surface 124s ₁ .

  As the imaging element 122, for example, a charge coupled device (CCD) image sensor element or a complementary metal oxide semiconductor (COMS) image sensor element is used.

  In the element package 114a according to the fourth embodiment, since the optical laminated body 125 is provided on the surface of the cover glass 124, antireflection characteristics can be imparted to the surface of the cover glass 124 without causing interference fringes. .

(Modification)
As shown in FIG. 9B, an element package 114b according to a modification of the fourth embodiment includes an optical low-pass filter 126 and an infrared light cut filter (hereinafter referred to as “IR”) between the cover glass 124 and the optical laminate 125. This is different from the element package 114a according to the fourth embodiment in that it includes a translucent part 123b further provided with 127. FIG. 9B shows an example in which an optical low-pass filter 126 is provided on the surface of the cover glass 124, and an infrared filter 127 is provided on the surface of the optical low-pass filter 126. It is not limited to.

<5. Fifth Embodiment>
As illustrated in FIG. 10, a camera module (imaging module) 131 according to the fifth embodiment of the present technology includes a lens 132, an IR cut filter 133, an imaging element 134, a housing 135, and a circuit board 136. The camera module 131 is suitable for application to electronic devices such as personal computers, tablet computers, and mobile phones.

  An image sensor 134 is mounted at a predetermined position on the surface of the circuit board 136. A housing 135 is fixed to the surface of the circuit board 136 so as to accommodate the imaging element 134. A lens 132 and an IR cut filter 133 are accommodated in the housing 135. The lens 132 and the IR cut filter 133 are provided at a predetermined interval in this order from the subject toward the image sensor 134. Light from the subject is collected by the lens 132 and imaged on the imaging surface of the imaging element 134 via the IR cut filter 133. On the surfaces of the lens 132 and the IR cut filter 133, the optical laminate 10 according to the first embodiment, the optical laminate 30 according to the second embodiment, or the optical laminate 40 according to the third embodiment is provided. It has been. Here, the front surface means at least one of a front surface on which light from a subject is incident and a rear surface on which light incident from the front surface is emitted. Further, the optical laminate 10 according to the second modification of the first embodiment, the optical laminate 30 according to the second modification of the second embodiment, or the third embodiment is provided on the inner peripheral surface of the housing 135. The optical laminated body 40 according to Modification 2 may be provided.

<6 Sixth Embodiment>
In the sixth embodiment, the optical laminate 10 according to the first embodiment, the optical laminate 30 according to the second embodiment, or the optical laminate 40 according to the third embodiment is applied to an imaging apparatus. An example will be described.

  Hereinafter, an example of a configuration of the imaging device 100 according to the sixth embodiment of the present technology will be described with reference to FIG. An imaging apparatus 100 according to the sixth embodiment is a so-called digital camera (digital still camera), and includes a housing 101, a lens barrel 102, and imaging optics provided in the housing 101 and the lens barrel 102. A system 103, an element package 114, and an autofocus sensor 115 are provided. The housing 101 and the lens barrel 102 may be configured to be detachable. At least one of the imaging optical system 103 and the element package 114 includes the optical laminate 10 according to the first embodiment, the optical laminate 30 according to the second embodiment, and the optical laminate 40 according to the third embodiment. Includes at least one of them.

  The imaging optical system 103 includes a lens 111, a light amount adjustment device 112, and a transflective mirror 113. The lens 111, the light amount adjusting device 112, and the semi-transmissive mirror 113 are provided in this order from the tip of the lens barrel 102 toward the element package 114. At least one selected from the group consisting of the lens 111, the light amount adjusting device 112, the transflective mirror 113, and the element package 114 is provided with an antireflection function. The autofocus sensor 115 is provided at a position where the light L reflected by the transflective mirror 113 can be received. The imaging apparatus 100 may further include a filter 116 as necessary. When the filter 116 is provided in this way, the filter 116 may be provided with an antireflection function. Hereinafter, each component and the antireflection function will be sequentially described.

(lens)
The lens 111 condenses the light L from the subject toward the element package 114.

(Light intensity adjustment device)
The light amount adjusting device 112 is a stop device that adjusts the size of the stop aperture with the optical axis of the imaging optical system 103 as the center. The light amount adjusting device 112 includes, for example, a pair of diaphragm blades and an ND filter that reduces the amount of transmitted light. As a driving method of the light amount adjusting device 112, for example, a method of driving a pair of diaphragm blades and an ND filter with one actuator, and a method of driving a pair of diaphragm blades and an ND filter with two independent actuators are used. However, it is not particularly limited to these methods. As the ND filter, a filter having a single transmittance or density or a filter whose transmittance or density changes in a gradation can be used. Further, the number of ND filters is not limited to one, and a plurality of ND filters may be stacked and used.

(Semi-transmissive mirror)
The transflective mirror 113 is a mirror that transmits part of incident light and reflects the rest. Specifically, the semi-transmissive mirror 113 reflects a part of the light L collected by the lens 111 toward the autofocus sensor 115, while directing the rest of the light L toward the element package 114. To Penetrate. Examples of the shape of the semi-transmissive mirror 113 include a sheet shape and a plate shape, but are not particularly limited to these shapes. Here, the sheet is defined as including a film.

(Element package)
The element package 114 receives the light transmitted through the transflective mirror 113, converts the received light into an electrical signal, and outputs it to a signal processing circuit (not shown).

(Auto focus sensor)
The autofocus sensor 115 receives the light reflected by the transflective mirror 113, converts the received light into an electrical signal, and outputs it to a control circuit (not shown).

(filter)
The filter 116 is provided at the tip of the lens barrel 102 or in the imaging optical system 103. FIG. 11 shows an example in which the filter 116 is provided at the tip of the lens barrel 102. When this configuration is employed, the filter 116 may have a configuration that is detachable from the distal end of the lens barrel 102.

  As the filter 116, a filter generally provided at the tip of the lens barrel 102 or in the imaging optical system 103 is used, but is not particularly limited thereto. Illustrative examples include polarization (PL) filters, sharp cut (SC) filters, color enhancement and effect filters, neutral density (ND) filters, color temperature conversion (LB) filters, color correction (CC) filters, and white balance acquisition. Filter, lens protection filter and the like.

(Antireflection function)
In the imaging apparatus 100, a plurality of optical elements (that is, the lens 111, the light amount adjusting device 112, and the semi-transmissive light) from when the light L from the subject reaches the imaging element in the element package 114 from the tip of the lens barrel 102. The mold mirror 113 and the cover glass of the element package 114). Hereinafter, an optical element that transmits light from the subject in the imaging apparatus 100 until it reaches the imaging element is referred to as a “transmissive optical element”. When the imaging apparatus 100 further includes the filter 116, the filter 116 is also regarded as a type of transmissive optical element.

  On the surface of at least one transmissive optical element among the plurality of transmissive optical elements, the optical laminated body 10 according to the first embodiment, the optical laminated body 30 according to the second embodiment, or the third The optical laminate 40 according to the embodiment is provided. Here, the surface of the transmissive optical element means an incident surface on which the light L from the subject is incident, or an exit surface from which the light L incident from the incident surface is emitted. Specifically, for example, as the element package 114, the element package 114a according to the above-described fourth embodiment or the element package 114b according to a modification thereof can be used.

  On the inner peripheral surface of the lens barrel 102, the optical laminated body 10 according to the second modification of the first embodiment, the optical laminated body 30 according to the second modification of the second embodiment, or the modification of the third embodiment. The optical laminate 40 according to Example 2 may be provided. Thereby, generation | occurrence | production of a stray light etc. can be suppressed.

<7 Seventh Embodiment>
In the above-described sixth embodiment, the case where the present technology is applied to a digital camera (digital still camera) as an imaging device has been described as an example. However, the application example of the present technology is not limited to this. In the seventh embodiment of the present technology, an example in which the present technology is applied to a digital video camera will be described.

  Hereinafter, an example of a configuration of an imaging device according to the seventh embodiment of the present technology will be described with reference to FIG. An imaging apparatus 201 according to the seventh embodiment is a so-called digital video camera, and includes a first lens group L1, a second lens group L2, a third lens group L3, a fourth lens group L4, an element package 202, a low-pass filter. 203, a filter 204, a motor 205, an iris blade 206, and an electric dimmer 207. In this image pickup apparatus 201, an image pickup optical system includes a lens first group L1, a lens second group L2, a lens third group L3, a lens fourth group L4, a low-pass filter 203, a filter 204, an iris blade 206, and an electric dimmer 207. Is configured. The iris blade 206 and the electric light control element 207 constitute an optical adjustment device. At least one selected from the group consisting of a first lens group L1, a second lens group L2, an electric light control element 207, a third lens group L3, a fourth lens group L4, a filter 204, a cover glass with a low-pass filter 203, and the like. Is provided with an antireflection function. At least one of the imaging optical system and the element package 202 includes the optical laminate 10 according to the first embodiment, the optical laminate 30 according to the second embodiment, and the optical laminate 40 according to the third embodiment. At least one of the following. Hereinafter, each component and the antireflection function will be sequentially described.

(Lens group)
The first lens group L1 and the third lens group L3 are fixed lenses. The second lens group L2 is a zoom lens. The fourth lens group is a focusing lens.

(Element package)
The element package 202 converts incident light into an electrical signal and supplies the signal to a signal processing unit (not shown).

(Low-pass filter)
The low-pass filter 203 is provided, for example, on the front surface of the element package 202, that is, the light incident surface of the cover glass. The low-pass filter 203 is for suppressing a false signal (moire) generated when a striped pattern image or the like close to the pixel pitch is taken, and is made of, for example, an artificial crystal.

  For example, the filter 204 cuts the infrared region of light incident on the element package 202, suppresses the floating of the spectrum in the near infrared region (630 nm to 700 nm), and makes the light intensity in the visible region (400 nm to 700 nm) uniform. It is for making. The filter 204 includes, for example, an infrared light cut filter (hereinafter referred to as an IR cut filter) 204a and an IR cut coat layer 204b formed by laminating an IR cut coat on the IR cut filter 204a. Here, the IR cut coat layer 204b is formed, for example, on at least one of the subject side surface of the IR cut filter 204a and the surface of the IR cut filter 204a on the element package 202 side. FIG. 12 shows an example in which an IR cut coat layer 204b is formed on the subject side surface of the IR cut filter 204a.

  The motor 205 moves the fourth lens group L4 based on a control signal supplied from a control unit (not shown). The iris blade 206 is for adjusting the amount of light incident on the element package 202 and is driven by a motor (not shown).

  The electric dimmer 207 is for adjusting the amount of light incident on the element package 202. The electric light control element 207 is an electric light control element made of a liquid crystal containing at least a dye-based pigment, for example, an electric light control element made of a dichroic GH liquid crystal.

(Antireflection function)
In the imaging apparatus 201, a plurality of optical elements (the first lens group L 1, the second lens group L 2, the electric light control element 207, the first lens element 207) until the light from the subject reaches the imaging element in the element package 202. 3 group L3, lens 4th group L4, filter 204, and cover glass with low pass filter 203). Hereinafter, such an optical element that transmits light L from the subject until it reaches the image sensor is referred to as a “transmissive optical element”. On the surface of at least one transmissive optical element among the plurality of transmissive optical elements, the optical laminated body 10 according to the first embodiment, the optical laminated body 30 according to the second embodiment, or the third The optical laminate 40 according to the embodiment is provided. Specifically, for example, as the element package 202, the element package 114a according to the above-described fourth embodiment or the element package 114b according to a modification example thereof can be used.

  On the inner peripheral surface 208s of the lens barrel 208, the optical laminate 10 according to the second modification of the first embodiment, the optical laminate 30 according to the second modification of the second embodiment, or the modification of the third embodiment. The optical laminate 40 according to Example 2 may be provided. Thereby, generation | occurrence | production of a stray light etc. can be suppressed.

<8. Eighth Embodiment>
An electronic apparatus according to the eighth embodiment includes a camera module 131 according to the fifth embodiment. Hereinafter, examples of electronic devices according to the eighth embodiment of the present technology will be described.

  An example in which the electronic device is a notebook personal computer 301 will be described with reference to FIG. The notebook personal computer 301 includes a computer main body 302 and a display 303. The computer main body 302 includes a housing 311, a keyboard 312 and a touch pad 313 housed in the housing 311.

  The display 303 includes a housing 321, a display element 322 and a camera module 131 housed in the housing 321. The display surface of the display element 322 may include the optical laminate 10 according to the first embodiment, the optical laminate 30 according to the second embodiment, or the optical laminate 40 according to the third embodiment. Good.

  When the front plate is provided on the front surface of the display 303, the optical laminate 10 according to the first embodiment, the optical laminate 30 according to the second embodiment, or the third is provided on the surface of the front plate. The optical laminate 40 according to the embodiment may be provided. Here, the surface means at least one of a front surface on which external light is incident and a rear surface on which external light incident from the front surface is emitted.

  An example in which the electronic device is a mobile phone 331 will be described with reference to FIGS. 14A and 14B. The mobile phone 331 is a so-called smartphone, and includes a housing 332, a display element with a touch panel 333 and a camera module 131 housed in the housing 332. The display element 333 with a touch panel is provided on the front side of the mobile phone 331, and the camera module 131 is provided on the back side of the mobile phone 331. Here, the optical laminate 10 according to the first embodiment, the optical laminate 30 according to the second embodiment, or the optical laminate 40 according to the third embodiment is provided on the input operation surface of the display element 333 with a touch panel. You may make it provide.

  An example in which the electronic device is a tablet computer 341 will be described with reference to FIGS. 15A and 15B. The tablet computer 341 includes a housing 342, a display element with a touch panel 343 and a camera module 131 housed in the housing 342. The display element 343 with a touch panel is provided on the front side of the tablet computer 341, and the camera module 131 is provided on the back side of the tablet computer 341. Here, the optical laminate 10 according to the first embodiment, the optical laminate 30 according to the second embodiment, or the optical laminate 40 according to the third embodiment is provided on the input operation surface of the display element 343 with a touch panel. You may make it provide.

  Hereinafter, the present technology will be specifically described by way of examples. However, the present technology is not limited only to these examples.

  The arithmetic average roughness Ra, the intermediate layer thickness D, the ratios R1 and R2, the softening point, the elastic modulus, and the moth-eye structure height H and pitch P in this example were determined as follows.

(Arithmetic mean roughness Ra)
The arithmetic average roughness Ra of the second unevenness was measured according to JIS B0601. Specifically, the roughness of the 2nd unevenness | corrugation was measured using the fine shape measuring apparatus (the product made by KLA-Tencor, P-15) as a measuring apparatus, and arithmetic mean roughness Ra was calculated | required. Note that the scan condition may be changed according to the value of Ra.

(Intermediate layer thickness D)
First, the optical laminated body was cut so as to include the top of the moth-eye structure, and the cross section thereof was photographed with a transmission electron microscope (TEM). Next, the thickness D of the intermediate layer was determined from the photographed TEM photograph.

(R1 of the thickness D of the intermediate layer to the height (structure layer thickness) d of the moth eye structure)
First, the optical laminate was cut so as to include the top of the moth-eye structure, and the cross section was photographed with a TEM. Next, the height d of the moth-eye structure and the thickness D of the intermediate layer were obtained from the photographed TEM photograph. Next, using the height d of the moth-eye structure and the thickness D of the intermediate layer obtained as described above, the thickness D of the intermediate layer relative to the height d (the thickness of the structural layer) d of the moth-eye structure The ratio R1 (= (D / d) × 100 [%]) was determined.

(R2 of the curvature k of the tip of the convex portion of the second unevenness with respect to the thickness D of the intermediate layer)
First, the optical laminate was cut so as to include the top of the moth-eye structure, and the cross section was photographed with a TEM. Next, the curvature k of the tip of the convex portion of the intermediate layer thickness D and the second unevenness was determined from the photographed TEM photograph. Next, using the thickness D and the curvature k of the intermediate layer obtained as described above, the ratio R2 (= (k) of the curvature k at the tip of the convex portion of the second unevenness with respect to the thickness D of the intermediate layer. / D) × 100 [%]).

(Softening point)
The softening point is determined by measuring a loss elastic modulus and a storage elastic modulus using a dynamic viscoelasticity measuring apparatus (DVA-225, manufactured by IT Measurement Co., Ltd.). Loss elastic modulus / storage elastic modulus = dielectric loss (tan δ) The peak value was determined and the value was taken as the softening point. In FIG. 16, the measurement result of the loss elastic modulus and storage elastic modulus of the 1st layer of the optical laminated body of Example 1 and a 2nd layer is shown.

(Elastic modulus)
The storage elastic modulus was measured using a dynamic viscoelasticity measuring apparatus (DVA-225, manufactured by IT Measurement Co., Ltd.), and this storage elastic modulus was defined as the elastic modulus (“elastic modulus” in Table 1).

(Moss eye structure height H, pitch P)
First, the optical laminate was cut so as to include the top of the moth-eye structure, and the cross section was photographed with a TEM. Next, the height H and pitch P of the moth-eye structure were obtained from the photographed TEM photograph.

(Example 1)
First, a PMMA (Tg: 90 ° C.) film was prepared as the second layer. Next, a photo-curing resin (manufactured by Toyo Gosei Co., Ltd., PAK-01) is applied to the surface of the second layer, the thickness of the intermediate layer is 0.126 μm, and the pitch and height of the moth-eye structure are The moth-eye shape was transferred so as to be 250 nm and 250 nm, respectively. Thereby, the 1st layer which has a moth-eye shape was formed in the surface of the 2nd layer. Next, by pressing the stainless steel plate subjected to the hairline processing on the first layer at 110 ° C. and 5 MPa, the hairline shape having an arithmetic average roughness Ra: 0.1 μm and a ratio R2: 54% is formed in the second layer. Formed on the surface. The target optical layered body was obtained as described above.

(Example 2)
Except that the moth-eye shape was transferred so that the thickness of the intermediate layer was 10 μm, and that the hairline shape of arithmetic average roughness Ra: 0.1 μm, ratio R2: 2% was formed on the surface of the second layer, An optical laminate was obtained in the same manner as Example 1.

(Example 3)
Except that the moth-eye shape was transferred so that the thickness of the intermediate layer was 0.5 μm, and that the hairline shape of arithmetic average roughness Ra: 0.5 μm, ratio R2: 14% was formed on the surface of the second layer Obtained an optical laminate in the same manner as in Example 1.

Example 4
Arithmetic mean roughness Ra: An optical laminate was obtained in the same manner as in Example 3 except that a hairline shape of 1.2 μm was formed.

(Example 5)
By transferring the moth-eye shape so that the thickness of the intermediate layer is 0.5 μm, and pressing the master having a prism shape with a V-shaped cross section against the first layer at 110 ° C. and 5 MPa, the arithmetic average roughness An optical layered body was obtained in the same manner as in Example 1 except that a prism shape having a V-shaped cross section of Ra: 1.8 μm and a ratio R2: 4% was formed on the surface of the second layer.

(Example 6)
Arithmetic mean roughness Ra: An optical layered body was obtained in the same manner as in Example 5 except that a prism shape having a V-shaped cross section with a diameter of 20 μm was formed.

(Example 7)
Arithmetic mean roughness Ra: An optical layered body was obtained in the same manner as in Example 5 except that a prism shape having a V-shaped cross section of 48 μm was formed.

(Example 8)
By transferring the moth-eye shape so that the thickness of the intermediate layer is 0.5 μm, and by pressing a master having a retroreflective prism shape (corner cube pattern shape) on the first layer at 110 ° C. and 5 MPa An optical laminate was obtained in the same manner as in Example 1 except that a retroreflective prism shape having an arithmetic average roughness Ra: 48 μm and a ratio R2: 4% was formed on the surface of the second layer.

Example 9
The moth-eye shape was transferred so that the thickness of the intermediate layer was 0.5 μm, and the pitch and height of the moth-eye structure were 150 nm and 150 nm, respectively. Moreover, the hairline shape of arithmetic average roughness Ra: 0.1 micrometer and ratio R2: 14% was formed in the surface of the 2nd layer. Other than this, an optical laminate was obtained in the same manner as in Example 1.

(Example 10)
The moth-eye shape was transferred so that the thickness of the intermediate layer was 0.525 μm, and the pitch and height of the moth-eye structure were 350 nm and 350 nm, respectively. Moreover, the hairline shape of arithmetic average roughness Ra: 0.7micrometer and ratio R2: 13% was formed in the surface of the 2nd layer. Other than this, an optical laminate was obtained in the same manner as in Example 1.

(Example 11)
First, a PMMA (Tg: 90 ° C.) film was prepared as the second layer. Next, a photocurable resin (Toyo Gosei Kogyo Co., Ltd., PAK-01) is applied to the surface of the second layer, the intermediate layer thickness is 1 μm, the pitch of the moth-eye structure, and the height is 250 nm, The moth-eye shape was transferred to 250 nm. Thereby, the 1st layer which has a moth-eye shape was formed in the surface of the 2nd layer. Next, the hairline-processed stainless steel plate was pressed against the first layer at 110 ° C. and 5 MPa to form a hairline shape on the surface of the second layer. Thereby, a prism processed film was obtained. Next, a prism-processed film was sandwiched between mirror-finished stainless steel plates and pressed under a condition of 3 MPa at 100 ° C. to return it to a substantially flat state. This obtained the target optical laminated body.

Example 12
What applied PMMA (Tg: 90 degreeC) on the glass plate was used as a 2nd layer. The moth-eye shape was transferred so that the thickness of the intermediate layer was 1 μm. A prism shape having a V-shaped cross section with an arithmetic average roughness Ra: 20 μm and a ratio R2: 2% was formed on the surface of the second layer. Other than this, an optical laminate was obtained in the same manner as in Example 5.

(Reference Example 1)
As the photocurable resin, PAK-01 manufactured by Toyo Gosei Kogyo Co., Ltd., Kyoeisha Chemical Co., Ltd., light acrylate 4EG-A mixed at a mass ratio of 50:50 was used. The moth-eye shape was transferred so that the thickness of the intermediate layer was 1 μm. A hairline shape having an arithmetic average roughness Ra: 0.1 μm and a ratio R2: 7% was formed on the surface of the second layer. Other than this, an optical laminate was obtained in the same manner as in Example 1.

(Reference Example 2)
Optically similar to Example 1, except that the moth-eye shape was transferred so that the thickness of the intermediate layer was 0.1 μm, and a hairline shape with a ratio R2: 70% was formed on the surface of the second layer. A laminate was obtained.

(Reference Example 3)
Except that the moth-eye shape was transferred so that the thickness of the intermediate layer was 11 μm, and that the hairline shape with an arithmetic average roughness Ra: 0.1 μm and a ratio R2: 2.2% was formed on the surface of the second layer Obtained an optical laminate in the same manner as in Example 2.

(Reference Example 4)
An optical laminate was obtained in the same manner as in Example 1 except that the moth-eye shape was transferred so that the thickness of the intermediate layer was 1 μm, and the formation of the uneven shape on the surface of the second layer was omitted.

(Reference Example 5)
Example except that the moth-eye shape was transferred so that the thickness of the intermediate layer was 1 μm, and a prism shape with an arithmetic average roughness Ra: 50 μm and a ratio R2: 2% was formed on the surface of the second layer. In the same manner as in Example 5, an optical laminate was obtained.

(Reference Example 6)
The moth-eye shape was transferred so that the thickness of the intermediate layer was 1 μm, and the pitch and height of the moth-eye structure were 150 nm and 150 nm, respectively. Further, the formation of the uneven shape on the surface of the second layer was omitted. Other than this, an optical laminate was obtained in the same manner as in Example 1.

(Reference Example 7)
The moth-eye shape was transferred so that the thickness of the intermediate layer was 0.5 μm, and the pitch and height of the moth-eye structure were 350 nm and 350 nm, respectively. Further, the formation of the uneven shape on the surface of the second layer was omitted. Other than this, an optical laminate was obtained in the same manner as in Example 1.

(Comparative Examples 1-1 to 1-12)
An optical body was obtained in the same manner as in Examples 1 to 12 except that the formation of the first layer was omitted.

(Comparative Examples 2-1 to 2-7)
An optical body was obtained in the same manner as in Reference Examples 1 to 7 except that the formation of the first layer was omitted.

(Comparative Examples 3-1 to 3-12)
An optical layered body was obtained in the same manner as in Examples 1 to 12 except that the provision of the uneven shape on the surface of the second layer was omitted.

(Comparative Examples 4-1 to 4-3, 4-5)
An optical layered body was obtained in the same manner as in Reference Examples 1 to 3 and 5 except that the provision of the uneven shape on the surface of the second layer was omitted.

(Reflectance)
The reflectances of the optical laminates of Examples 1 to 12 and Reference Examples 1 to 7 obtained as described above were evaluated as follows. First, a black tape was bonded to the back surface of the optical laminate. Next, light is incident from the surface (moth eye structure surface) opposite to the side on which the black tape is bonded, and the reflection spectrum of the optical laminate is measured using an evaluation device (V-550) manufactured by JASCO Corporation. And measured. The angle of incident light was 30 °. Here, the angle of incident light (θ = 30 °) was determined based on the angle (θ = 0 °) when the surface of the optical laminated body (moth eye structure surface) was viewed from the front. Next, the average reflectance in the wavelength range from 380 nm to 780 nm was determined from the measured reflection spectrum. The results are shown in Table 2.

(Orientation)
The alignment characteristics of the optical laminates of Examples 1 to 12 and Reference Examples 1 to 7 obtained as described above were evaluated as follows. First, the optical laminate was cut so as to include the top of the moth-eye structure, and the cross section was photographed with a TEM. Next, whether or not the moth-eye structure satisfies the following conditions A and B was evaluated from the photographed TEM photograph.
Condition A: The orientation of the moth-eye structure is ± 30 ° or more from the normal of the optical laminate (front surface of the optical laminate (the front of the moth-eye structure)), and the orientation of the moth-eye structure is the second structure ( Hairline shape, prism shape or CCP shape) is within a range of ± 10 ° or less from the slope normal line Condition B: The moth-eye structure is continuously formed on the surface of the first layer

Next, based on the evaluation results of conditions A and B, the orientation was evaluated according to the following criteria.
○: Both conditions A and B are satisfied ×: Both conditions A and B are not satisfied, or one of the conditions is not satisfied

(Antireflection characteristics)
The average reflectance of the optical laminates of Examples 1 to 12 and Reference Examples 1 to 7 obtained as described above at an incident angle of 0 ° and 30 ° (hereinafter referred to as “incident angle of 0 ° with the first layer is 0 °). , 30 ° average reflectance ”or“ average reflectance at an incident angle of 30 ° in the case of having a shape-transferred second layer ”was measured as follows. First, a black tape was bonded to the back surface of the optical laminate. Next, light is incident from the surface (moth eye structure surface) opposite to the side on which the black tape is bonded, and the reflection spectrum of the optical laminate is measured using an evaluation device (V-550) manufactured by JASCO Corporation. And measured. The incident light angle θ was set to 0 ° or 30 °. Here, the angle θ of the incident light was based on the angle (θ = 0 °) when the surface of the optical laminate (moth eye structure surface) was viewed from the front. Next, average reflectances at incident angles of 0 ° and 30 ° in the wavelength range of 380 nm to 780 nm were obtained from the measured reflection spectrum.

  Next, the average reflectances of the optical bodies of Comparative Examples 1-1 to 1-12 and Comparative Examples 2-1 to 2-7 obtained as described above at the incident angles of 0 ° and 30 ° (hereinafter referred to as “first”). The average reflectance of incident light at 0 ° and 30 ° of incident light in the absence of the above-mentioned layer ”was measured as described in Examples 1-12 and Reference Examples 1-7.

  Next, an average reflectance (hereinafter referred to as “hereinafter referred to as“ an optical reflectance ”) of the optical laminates of Comparative Examples 3-1 to 3-12, Comparative Examples 4-1 to 4-3, and 4-5 obtained as described above. The average reflectance at an incident angle of 30 ° in the case of having a flat second layer "was measured as appropriate in the same manner as in Examples 1 to 12 and Reference Examples 1 to 7 described above.

Next, “average reflectance at an incident angle of 0 ° and 30 ° with the first layer” and “an average of the incident angles at 0 ° and 30 ° without the first layer” obtained as described above. Using the “reflectance”, the following ratios Ra ₀ and Ra ₃₀ (change rate of the average reflectance depending on the presence or absence of the first layer) were obtained.
Ratio Ra ₀ = [(average reflectance at an incident angle of 0 ° with the first layer) / (average reflectance at an incident angle of 0 ° without the first layer)]
Ratio Ra ₃₀ = [(average reflectance at an incident angle of 30 ° with the first layer) / (average reflectance at an incident angle of 30 ° without the first layer)]

Next, the “average reflectance at an incident angle of 30 ° with the second layer having the shape transferred” and the average of the incident angle at 30 ° with the flat second layer obtained as described above. Using the “reflectance”, the following ratio Rb ₃₀ (rate of change in average reflectance depending on the presence or absence of the shape of the second layer) was determined.
Ratio Rb ₃₀ = [(average reflectance at an incident angle of 30 ° when having a shape-transferred second layer) / (average reflectance at an incident angle of 30 ° when having a flat second layer)]

Next, using the ratios Ra ₀ and Ra ₃₀ and the ratio Rb ₃₀ obtained as described above, the reflection characteristics were evaluated according to the following criteria.
○: Ratio Ra _0, Ra ₃₀ ≦ 0.8 and,, × satisfy both relationships of Rb ₃₀ ≦ 0.8: Both ratios Ra _0, Ra ₃₀ ≦ 0.8, and, Rb ₃₀ ≦ 0.8 Does not satisfy the relationship, or does not satisfy any of the relationships

ＨＬ：ヘアライン形状
Ｖ：断面Ｖ字のプリズム形状
ＣＣＰ：コーナーキューブパターン形状
Ｒａ：算術平均粗さ
Ｒ１：（Ｄ／ｄ）×１００［％］（Ｄ：中間層の厚さ、ｄ：モスアイ構造体の高さ（構造層の厚さ））
Ｒ２：（ｋ／Ｄ）×１００［％］（ｋ：第２の凹凸のうち凸部の先端の曲率、Ｄ：中間層の厚さ） Table 1 shows the structure of the optical laminated body of Examples 1-12 and Reference Examples 1-7.

HL: hairline shape V: prism shape with V-shaped cross section CCP: corner cube pattern shape Ra: arithmetic average roughness R1: (D / d) × 100 [%] (D: intermediate layer thickness, d: moth eye structure Height (structure layer thickness))
R2: (k / D) × 100 [%] (k: curvature of the tip of the convex portion of the second unevenness, D: thickness of the intermediate layer)

なお、配向性の評価結果欄において、「第１の層形状潰れ」、「第１の層形状崩れ」および「第１の層割れ」は、具体的には以下の状態を意味している。
第１の層形状潰れ：第１の層のモスアイ形状に潰れが発生した状態
第１の層形状崩れ：第１の層のモスアイ形状に形状崩れが発生した状態
第１の層割れ：第１の層に割れが発生した状態 Table 2 shows the evaluation results of the optical laminates of Examples 1 to 12 and Reference Examples 1 to 7.

In the orientation evaluation result column, “first layer shape collapse”, “first layer shape collapse”, and “first layer crack” specifically mean the following states.
First layer shape collapse: State in which the moth-eye shape of the first layer is crushed First layer shape collapse: State in which the shape rupture occurs in the moth-eye shape of the first layer First layer crack: First When cracks occur in the layer

From Tables 1 and 2, the following can be understood.
In Reference Example 1, since the softening point of the first layer is lower than the softening point of the second layer, moth-eye shape collapse has occurred. In Reference Example 2, since the ratio R1 is less than 50%, the moth-eye shape is broken. In Reference Example 3, since the ratio R1 exceeds 4000%, the first layer is cracked. In Reference Example 4, since the arithmetic average roughness Ra is less than 0.1 μm, the moth-eye structure is hardly oriented obliquely with respect to the surface of the optical layered body. In Reference Example 5, since the arithmetic average roughness Ra exceeds 48 μm, the first layer is cracked. In Reference Examples 6 and 7, since the arithmetic average roughness Ra is less than 0.1 μm, it is hardly oriented obliquely with respect to the surface of the optical layered body. Therefore, in Reference Examples 1-6, the reflectance with respect to incident incidence is high, and the evaluation results of the antireflection characteristics are also poor.
On the other hand, in Examples 1 to 12, since the arithmetic average roughness Ra is 0.1 μm or more and 48 μm or less and the ratio R1 is 50% or more and 4000% or less, good orientation (orientation in the oblique direction). Is obtained. Therefore, in Examples 1-12, the reflectance with respect to incident incidence is low, and the evaluation result of an antireflection characteristic is also favorable.

  The embodiment of the present technology and its modifications have been specifically described above, but the present technology is not limited to the above-described embodiment and its variations, and various modifications based on the technical idea of the present technology. Is possible.

  For example, the configurations, methods, steps, shapes, materials, numerical values, and the like given in the above-described embodiment and its modifications are merely examples, and different configurations, methods, steps, shapes, materials, and numerical values are necessary as necessary. Etc. may be used.

  In addition, the configurations, methods, processes, shapes, materials, numerical values, and the like of the above-described embodiments and modifications thereof can be combined with each other without departing from the gist of the present technology.

The present technology can also employ the following configurations.
(1)
A first layer having first irregularities;
A second layer having second irregularities,
The arithmetic average roughness of the second unevenness is 0.1 μm or more and 48 μm or less,
The first layer includes a plurality of structures constituting the first unevenness,
The plurality of structures are provided on the second unevenness with a pitch equal to or less than the wavelength of light for the purpose of reducing reflection, and have a plurality of orientations.
(2)
The first layer is
A structural layer comprising the plurality of structures,
An intermediate layer provided between the structural layer and the second layer,
The ratio R (= (D / d) × 100) of the thickness D of the intermediate layer to the thickness d of the structural layer is 50% or more and 4000% or less in the laminate according to (1).
(3)
The laminated body according to (1) or (2), wherein the softening point of the second layer is lower than the softening point of the first layer.
(4)
A third layer having third irregularities;
The laminate according to any one of (1) to (3), wherein the second layer is provided on the third unevenness.
(5)
The second unevenness includes a plurality of curved surfaces or planes,
The laminated body according to any one of (1) to (4), wherein an orientation direction of the plurality of structures is substantially perpendicular to the curved surface or the plane.
(6)
The said 2nd unevenness | corrugation is a laminated body in any one of (1) to (5) which has diffusibility.
(7)
The laminate according to any one of (1) to (5), wherein the second unevenness has directivity.
(8)
The laminate according to any one of (1) to (5), wherein the second unevenness is a lens pattern.
(9)
The laminate according to any one of (1) to (8), wherein at least one of the first layer and the second layer has light absorptivity.
(10)
(1) The image pick-up element package containing the laminated body in any one of (8).
(11)
(1) The imaging device containing the laminated body in any one of (9).
(12)
(1) The electronic device containing the laminated body in any one of (9).

(13)
Forming a first layer having a first concavo-convex structure composed of a plurality of structures provided at a pitch equal to or less than the wavelength of light for the purpose of reducing reflection on the surface of the second layer;
The manufacturing method of the laminated body including providing the 2nd unevenness | corrugation of arithmetic mean roughness 0.1 micrometer or more and 48 micrometers or less to the surface of the said 2nd layer.
(14)
The method for producing a laminate according to (13), wherein the second unevenness is imparted to the surface of the second layer by pressing a master on the first unevenness.
(15)
Before the formation of the first layer relative to the surface of the second layer, the second layer is formed on the surface of the third layer,
The method for producing a laminate according to (13) or (14), further including providing third irregularities on the surface of the third layer after imparting the second irregularities.
(16)
The method for producing a laminate according to (15), wherein the third unevenness is imparted to the surface of the third layer by pressing a master on the first unevenness.
(17)
The method for producing a laminate according to any one of (13) to (16), further including pressing a master having a flat molding surface against the first unevenness after the second unevenness is imparted.
(18)
The method for manufacturing a laminate according to any one of (13) to (17), further including returning the second unevenness to a substantially planar shape after the application of the second unevenness.

DESCRIPTION OF SYMBOLS 10 Transparent laminated body 11 1st layer 11a 1st structure 11b Intermediate | middle layer 11s 1st unevenness | corrugation 12 2nd layer 12a 2nd structure 12s 2nd unevenness | corrugation 13 3rd layer 13a 3rd structure 13s 3rd unevenness 114 Imaging device package 131 Camera module 100, 201 Imaging device 301, 331, 341 Electronic device

Claims (12)

A first layer having first irregularities;
A second layer having second irregularities,
The arithmetic average roughness of the second unevenness is 0.1 μm or more and 48 μm or less,
The first layer includes a plurality of structures constituting the first unevenness,
The plurality of structures are provided on the second unevenness with a pitch equal to or less than the wavelength of light for the purpose of reducing reflection, and have a plurality of orientations. The first layer is
A structural layer comprising the plurality of structures,
An intermediate layer provided between the structural layer and the second layer,
2. The laminate according to claim 1, wherein a ratio R (= (D / d) × 100) of the thickness D of the intermediate layer to the thickness d of the structural layer is 50% or more and 4000% or less.   The laminate according to claim 1, wherein the softening point of the second layer is lower than the softening point of the first layer. A third layer having third irregularities;
The laminate according to claim 1, wherein the second layer is provided on the third unevenness. The second unevenness includes a plurality of curved surfaces or planes,
The laminate according to claim 1, wherein an orientation direction of the plurality of structures is substantially perpendicular to the curved surface or the plane.   The laminate according to claim 1, wherein the second unevenness has diffusibility.   The laminate according to claim 1, wherein the second unevenness has directivity.   The laminate according to claim 1, wherein the second unevenness is a lens pattern.   The laminate according to claim 1, wherein at least one of the first layer and the second layer has light absorption. An image sensor;
A light-transmitting part and a package for accommodating the image sensor,
The translucent part is
A first layer having first irregularities;
A second layer having second irregularities,
The arithmetic average roughness of the second unevenness is 0.1 μm or more and 48 μm or less,
The first layer includes a plurality of structures constituting the first unevenness,
The image pickup device package, wherein the plurality of structures are provided on the second unevenness at a pitch equal to or less than a wavelength of light for the purpose of reducing reflection and have a plurality of orientations. Optical system,
An image sensor package, and
At least one of the optical system and the imaging device package is
A first layer having first irregularities;
A second layer having second irregularities,
The arithmetic average roughness of the second unevenness is 0.1 μm or more and 48 μm or less,
The first layer includes a plurality of structures constituting the first unevenness,
The image pickup device, wherein the plurality of structures are provided on the second unevenness at a pitch equal to or less than a wavelength of light for the purpose of reducing reflection and have a plurality of orientations. Optical system,
An image sensor package, and
At least one of the optical system and the imaging device package is
A first layer having first irregularities;
A second layer having second irregularities,
The arithmetic average roughness of the second unevenness is 0.1 μm or more and 48 μm or less,
The first layer includes a plurality of structures constituting the first unevenness,
The plurality of structures are provided on the second unevenness with a pitch equal to or less than the wavelength of light for the purpose of reducing reflection, and have a plurality of orientations.

Images