JP6887618B2 - Laminated body with dimming function - Google Patents

Laminated body with dimming function Download PDF

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Publication number
JP6887618B2
JP6887618B2 JP2018103487A JP2018103487A JP6887618B2 JP 6887618 B2 JP6887618 B2 JP 6887618B2 JP 2018103487 A JP2018103487 A JP 2018103487A JP 2018103487 A JP2018103487 A JP 2018103487A JP 6887618 B2 JP6887618 B2 JP 6887618B2
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sheet
dimming
glass
dimming function
laminated body
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JP2019206137A (en
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隆行 野田
隆行 野田
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Nippon Electric Glass Co Ltd
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Nippon Electric Glass Co Ltd
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Priority to JP2018103487A priority Critical patent/JP6887618B2/en
Priority to CN201980025687.5A priority patent/CN111989215B/en
Priority to DE112019002705.0T priority patent/DE112019002705T5/en
Priority to PCT/JP2019/017407 priority patent/WO2019230278A1/en
Priority to TW108116482A priority patent/TWI809101B/en
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10431—Specific parts for the modulation of light incorporated into the laminated safety glass or glazing
    • B32B17/10467—Variable transmission
    • B32B17/10486—Variable transmission photochromic
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
    • B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
    • B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10009—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets
    • B32B17/10036—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets
    • B32B17/10045—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the number, the constitution or treatment of glass sheets comprising two outer glass sheets with at least one intermediate layer consisting of a glass sheet
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    • B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
    • B32B17/10165—Functional features of the laminated safety glass or glazing
    • B32B17/10431—Specific parts for the modulation of light incorporated into the laminated safety glass or glazing
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    • B32B17/10788—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing characterized by the resin layer, i.e. interlayer containing ethylene vinylacetate
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Description

本発明は、ガラスシート、樹脂シート、及び調光シートを備えた調光機能付き積層体に関する。 The present invention relates to a laminated body with a dimming function including a glass sheet, a resin sheet, and a dimming sheet.

周知のように、液晶方式、サーモクロミック方式、ＳＰＤ方式（Ｓｕｓｐｅｎｄｅｄ Ｐａｒｔｉｃｌｅ Ｄｅｖｉｃｅ）、エレクトロクロミック方式等により窓の光学特性（光の透過率や色調等）を調節することが可能な調光窓がある。 As is well known, there is a dimming window in which the optical characteristics (light transmittance, color tone, etc.) of the window can be adjusted by a liquid crystal method, a thermochromic method, an SPD method (Suppended Particle Device), an electrochromic method, or the like. ..

ところで、調光窓の軽量化を図るに際しては、調光窓を構成するガラス板に代えて、特許文献１に開示されるような、樹脂シートの表裏両側にそれぞれ接着層を介してガラスシートを貼り合わせた積層体を利用する場合がある。具体的には、積層体の樹脂シートとガラスシートとの間に接着層を介して調光シート（電源のオン・オフの切り換えに伴って光の透過率が調節されるシート等）を配置し、調光機能付き積層体とする。この調光機能付き積層体は、同じ厚みのガラス板よりも軽いことから、その分だけ調光窓の軽量化を図ることが可能となる。 By the way, in order to reduce the weight of the dimming window, instead of the glass plate constituting the dimming window, a glass sheet is provided on both the front and back sides of the resin sheet via adhesive layers as disclosed in Patent Document 1. A laminated body may be used. Specifically, a dimming sheet (a sheet whose light transmittance is adjusted by switching the power on / off, etc.) is arranged between the resin sheet and the glass sheet of the laminated body via an adhesive layer. , A laminated body with a dimming function. Since this laminated body with a dimming function is lighter than a glass plate having the same thickness, it is possible to reduce the weight of the dimming window accordingly.

国際公開第２０１６／０９８７６９号International Publication No. 2016/098769

しかしながら、上記の調光機能付き積層体においては、下記のような解決すべき問題があった。 However, the above-mentioned laminated body with a dimming function has the following problems to be solved.

すなわち、調光シートを挟んで対向するガラスシートと樹脂シートとの熱膨張係数の差に起因して応力が発生し、この応力により調光シートの機能が低下したり、調光シートが破損したりする不具合が生じていた。具体例を挙げると、対向して配置された二枚の基材シートと、両基材シートの間に封入された液晶又は配向粒子とを備える調光シートでは、上記の応力により両基材シートの間隔が不均一になって光の透過率にバラつきが生じたり、基材シートが剥離して調光シートが破損したりする場合があった。 That is, stress is generated due to the difference in the coefficient of thermal expansion between the glass sheet and the resin sheet that face each other across the light control sheet, and this stress reduces the function of the light control sheet or damages the light control sheet. There was a problem such as. To give a specific example, in a dimming sheet provided with two base sheets arranged to face each other and liquid crystal or oriented particles enclosed between the two base sheets, both base sheets are subjected to the above stress. In some cases, the intervals between the particles become uneven and the light transmittance varies, or the base sheet is peeled off and the dimming sheet is damaged.

上記の事情に鑑みなされた本発明は、ガラスシート、樹脂シート、及び調光シートを備えた調光機能付き積層体において、調光シートの機能低下や破損を回避することを技術的な課題とする。 In view of the above circumstances, the present invention has a technical problem of avoiding functional deterioration or damage of the dimming sheet in a laminated body having a dimming function including a glass sheet, a resin sheet, and a dimming sheet. To do.

上記の課題を解決するために創案された本発明は、表裏両側でそれぞれ最外層に配置された両ガラスシートと、両ガラスシートの相互間に配置された樹脂シート及び調光シートとを含む複数のシートを備え、複数のシートが隣り合うシート同士の相互間に介在した接着層により積層一体化された調光機能付き積層体であって、調光シートの表側に隣接して配置された表側シートと、裏側に隣接して配置された裏側シートとが、共にガラスシート、又は、共に樹脂シートであることを特徴とする。 The present invention, which was devised to solve the above problems, includes a plurality of glass sheets arranged on the outermost layers on both the front and back sides, and a resin sheet and a dimming sheet arranged between the two glass sheets. A laminated body with a dimming function in which a plurality of sheets are laminated and integrated by an adhesive layer interposed between adjacent sheets, and the front side is arranged adjacent to the front side of the dimming sheet. The sheet and the back side sheet arranged adjacent to the back side are both glass sheets or resin sheets.

このような構成によれば、表側シートと裏側シートとが共にガラスシート、又は、共に樹脂シートであることから、表側シートと裏側シートとが類似した熱膨張特性を有することになる。これにより、表側シートと裏側シートとの熱膨張係数の差に起因した応力の発生を可及的に抑制できる。その結果、調光シートの機能低下や破損を回避することが可能となる。 According to such a configuration, since both the front side sheet and the back side sheet are glass sheets or both resin sheets, the front side sheet and the back side sheet have similar thermal expansion characteristics. As a result, the generation of stress due to the difference in the coefficient of thermal expansion between the front side sheet and the back side sheet can be suppressed as much as possible. As a result, it is possible to avoid functional deterioration and damage of the dimming sheet.

上記の構成において、表側シートと裏側シートとの熱膨張係数について、大きい方の値が小さい方の値の４倍以下であることが好ましい。 In the above configuration, the coefficient of thermal expansion of the front side sheet and the back side sheet is preferably 4 times or less the larger value than the smaller value.

このような構成によれば、両シートの熱膨張係数について、大きい方の値が小さい方の値の４倍以下であるため、表側シートと裏側シートとの熱膨張係数の差に起因した応力の発生をさらに抑制できる。その結果、調光シートの機能低下や破損をより確実に回避することが可能となる。 According to such a configuration, the coefficient of thermal expansion of both sheets is less than four times the value of the smaller one, so that the stress caused by the difference in the coefficient of thermal expansion between the front side sheet and the back side sheet is increased. Occurrence can be further suppressed. As a result, it is possible to more reliably avoid functional deterioration and damage of the dimming sheet.

上記の構成において、表側シートと裏側シートとの組成が、同一であることが好ましい。 In the above configuration, it is preferable that the front side sheet and the back side sheet have the same composition.

このような構成によれば、両シートの熱膨張係数が同じになるため、表側シートと裏側シートとの熱膨張係数の差に起因した応力の発生を回避できる。その結果、調光シートの機能低下や破損をより確実に回避することが可能となる。 According to such a configuration, since the thermal expansion coefficients of both sheets are the same, it is possible to avoid the generation of stress due to the difference in the thermal expansion coefficients between the front side sheet and the back side sheet. As a result, it is possible to more reliably avoid functional deterioration and damage of the dimming sheet.

上記の構成において、表側シートと裏側シートとの厚みが、同一であってもよいし、異なっていてもよい。 In the above configuration, the thicknesses of the front side sheet and the back side sheet may be the same or different.

例えば、表側シートと裏側シートとのうち、一方のシートが最外層に配置されたガラスシートである場合に、当該ガラスシートの厚みを他方のシート（ガラスシート）の厚みよりも大きくすれば、一方のシートの厚さにより調光機能付き積層体の外力に対する強度を確保しつつ、他方のシートの薄さにより積層体の厚みの不当な増大を防止できる。さらに、例えば、表側シートと裏側シートとが共に樹脂シートである場合に、一方のシートの厚みを他方のシートの厚みよりも大きくすれば、一方のシートの厚さにより積層体の芯材としての十分な強度を確保しつつ、他方のシートの薄さにより積層体の厚みの不当な増大を防止できる。 For example, when one of the front side sheet and the back side sheet is a glass sheet arranged in the outermost layer, if the thickness of the glass sheet is made larger than the thickness of the other sheet (glass sheet), one of them. The thickness of the sheet makes it possible to secure the strength of the laminated body with a dimming function against an external force, and the thinness of the other sheet prevents an unreasonable increase in the thickness of the laminated body. Further, for example, when both the front side sheet and the back side sheet are resin sheets, if the thickness of one sheet is made larger than the thickness of the other sheet, the thickness of one sheet can be used as the core material of the laminate. While ensuring sufficient strength, the thinness of the other sheet can prevent an unreasonable increase in the thickness of the laminate.

上記の構成において、最外層に配置された両ガラスシートの厚みが、同一であってもよいし、異なっていてもよい。 In the above configuration, the thicknesses of both glass sheets arranged in the outermost layer may be the same or different.

例えば、調光機能付き積層体の厚み方向における片側半分にのみ調光シートが配置される場合に、調光シートが存在しない側の最外層のガラスシートの厚みを、存在する側の最外層のガラスシートの厚みよりも大きくすれば、表裏両側での剛性のバランスが取れ、積層体の反りを可及的に抑制することが可能となる。 For example, when the dimming sheet is arranged only on one half in the thickness direction of the laminated body with the dimming function, the thickness of the outermost glass sheet on the side where the dimming sheet does not exist is set to the thickness of the outermost layer on the side where the dimming function exists. If the thickness is made larger than the thickness of the glass sheet, the rigidity on both the front and back sides can be balanced, and the warp of the laminated body can be suppressed as much as possible.

上記の構成において、接着層が、紫外線遮蔽機能を有することが好ましい。 In the above configuration, it is preferable that the adhesive layer has an ultraviolet shielding function.

このようにすれば、紫外線に対する耐性の低い樹脂シートや調光シートについて、これらのシートを紫外線による劣化から保護することが可能となる。 In this way, it is possible to protect the resin sheet and the dimming sheet having low resistance to ultraviolet rays from deterioration due to ultraviolet rays.

上記の構成において、調光シートの表面と接着した接着層と裏面と接着した接着層との厚みが、異なっていてもよい。 In the above configuration, the thicknesses of the adhesive layer adhered to the front surface of the light control sheet and the adhesive layer adhered to the back surface may be different.

例えば、調光シートの表面側の接着層と裏面側の接着層とのうち、調光機能付き積層体に対して光が入射する側（採光側）に存する接着層の厚みを、他方の接着層の厚みよりも大きくすれば、樹脂シートや調光シートを紫外線による劣化から保護する機能を一層高めることが可能となる。 For example, of the adhesive layer on the front surface side and the adhesive layer on the back surface side of the dimming sheet, the thickness of the adhesive layer existing on the side where light is incident on the laminated body with a dimming function (lighting side) is adjusted to the other. If it is made larger than the thickness of the layer, it is possible to further enhance the function of protecting the resin sheet and the dimming sheet from deterioration due to ultraviolet rays.

上記の構成において、当該調光機能付き積層体を構成するガラスシートの厚みが、０．０５ｍｍ〜１．５ｍｍの範囲内であることが好ましい。 In the above configuration, the thickness of the glass sheet constituting the laminated body with the dimming function is preferably in the range of 0.05 mm to 1.5 mm.

このようにすれば、調光機能付き積層体の軽量性や強度を確保しつつ、積層体の厚みの不当な増大を防止できると共に、反りの発生についても抑制できる。 By doing so, it is possible to prevent an unreasonable increase in the thickness of the laminated body while ensuring the lightness and strength of the laminated body with a dimming function, and it is also possible to suppress the occurrence of warpage.

上記の構成において、当該調光機能付き積層体を構成するガラスシートが、無アルカリガラス又は化学強化ガラスでなるシートであるか、或いは、無アルカリガラスでなるシートと化学強化ガラスでなるシートとを含んでいることが好ましい。 In the above configuration, the glass sheet constituting the dimming laminated body is a sheet made of non-alkali glass or chemically tempered glass, or a sheet made of non-alkali glass and a sheet made of chemically strengthened glass. It is preferable to include it.

ガラスシートが無アルカリガラスでなるシートである場合には、耐環境性に優れることから、調光機能付き積層体の変質を好適に防ぐことが可能となる。また、調光シートとして、エレクトロクロミック方式のシートを採用する場合に、アルカリ成分によるエレクトロクロミック機能材料の変質を防ぐのに好適である。一方、ガラスシートが化学強化ガラスでなるシートである場合には、ガラスシートが薄くとも十分な強度を確保できる。この化学強化ガラスでなるシートは、最外層のガラスシートとすることが好適である。 When the glass sheet is a sheet made of non-alkali glass, it is excellent in environmental resistance, so that it is possible to suitably prevent deterioration of the laminate with a dimming function. Further, when an electrochromic sheet is used as the dimming sheet, it is suitable for preventing deterioration of the electrochromic functional material due to an alkaline component. On the other hand, when the glass sheet is a sheet made of chemically strengthened glass, sufficient strength can be secured even if the glass sheet is thin. The sheet made of this chemically strengthened glass is preferably the outermost glass sheet.

上記の構成において、調光シートが、可撓性を有する液晶方式又はＳＰＤ方式のシートであってもよい。 In the above configuration, the dimming sheet may be a flexible liquid crystal type or SPD type sheet.

調光シートが可撓性を有する液晶方式又はＳＰＤ方式のシートであって、当該シートが樹脂シートとガラスシートとの間に接着層を介して配置されるような場合には、特に調光シートの機能低下や破損が生じやすい。従って、調光シートが可撓性を有する液晶方式又はＳＰＤ方式のシートである場合に本発明を適用すれば、その効果を一層好適に享受できる。 Especially when the dimming sheet is a flexible liquid crystal or SPD sheet and the sheet is arranged between the resin sheet and the glass sheet via an adhesive layer, the dimming sheet is used. Is prone to functional deterioration and damage. Therefore, if the present invention is applied when the dimming sheet is a flexible liquid crystal type or SPD type sheet, the effect can be more preferably enjoyed.

本発明によれば、ガラスシート、樹脂シート、及び調光シートを備えた調光機能付き積層体において、調光シートの機能低下や破損を回避することが可能となる。 According to the present invention, in a laminated body having a dimming function including a glass sheet, a resin sheet, and a dimming sheet, it is possible to avoid functional deterioration or damage of the dimming sheet.

本発明の第一実施形態に係る調光機能付き積層体を示す縦断側面図である。It is a vertical sectional side view which shows the laminated body with a dimming function which concerns on 1st Embodiment of this invention. 本発明の第一実施形態に係る調光機能付き積層体の第一変形例を示す縦断側面図である。It is a longitudinal side view which shows the 1st modification of the laminated body with a dimming function which concerns on 1st Embodiment of this invention. 本発明の第一実施形態に係る調光機能付き積層体の第二変形例を示す縦断側面図である。It is a longitudinal side view which shows the 2nd modification of the laminated body with a dimming function which concerns on 1st Embodiment of this invention. 本発明の第一実施形態に係る調光機能付き積層体の第三変形例を示す縦断側面図である。It is a longitudinal side view which shows the 3rd modification of the laminated body with a dimming function which concerns on 1st Embodiment of this invention. 本発明の第一実施形態に係る調光機能付き積層体の第四変形例を示す縦断側面図である。It is a longitudinal side view which shows the 4th modification of the laminated body with a dimming function which concerns on 1st Embodiment of this invention. 本発明の第二実施形態に係る調光機能付き積層体を示す縦断側面図である。It is a vertical sectional side view which shows the laminated body with a dimming function which concerns on 2nd Embodiment of this invention. 本発明の第三実施形態に係る調光機能付き積層体を示す縦断側面図である。It is a vertical sectional side view which shows the laminated body with a dimming function which concerns on 3rd Embodiment of this invention. 本発明の第三実施形態に係る調光機能付き積層体の第一変形例を示す縦断側面図である。It is a longitudinal side view which shows the 1st modification of the laminated body with a dimming function which concerns on 3rd Embodiment of this invention. 本発明の第三実施形態に係る調光機能付き積層体の第二変形例を示す縦断側面図である。It is a longitudinal side view which shows the 2nd modification of the laminated body with a dimming function which concerns on 3rd Embodiment of this invention. 本発明の第四実施形態に係る調光機能付き積層体を示す縦断側面図である。It is a longitudinal side view which shows the laminated body with a dimming function which concerns on 4th Embodiment of this invention. 本発明の第四実施形態に係る調光機能付き積層体の変形例を示す縦断側面図である。It is a longitudinal side view which shows the modification of the laminated body with a dimming function which concerns on 4th Embodiment of this invention.

以下、本発明の実施形態に係る調光機能付き積層体について、添付の図面を参照しながら説明する。なお、実施形態の説明で参照する図面では、便宜上、調光機能付き積層体に備わった複数のシートの厚みの比率を、実際とは異なる比率で表している場合がある。さらに、実施形態の説明では、図面上の調光機能付き積層体における上側を「表側」、下側を「裏側」と表記している。また、「表側」が太陽光の入射側（採光側又は外部環境側）であるが、本発明の積層体はこれに限定されず、例えば太陽光の入射がない内部環境に配置されてもよい。 Hereinafter, the laminated body with a dimming function according to the embodiment of the present invention will be described with reference to the accompanying drawings. In the drawings referred to in the description of the embodiment, for convenience, the ratio of the thicknesses of the plurality of sheets provided in the laminated body with the dimming function may be represented by a ratio different from the actual one. Further, in the description of the embodiment, the upper side of the laminated body with the dimming function on the drawing is described as "front side" and the lower side is described as "back side". Further, the "front side" is the incident side of sunlight (lighting side or external environment side), but the laminate of the present invention is not limited to this, and may be arranged in an internal environment where there is no incident of sunlight, for example. ..

＜第一実施形態＞
図１に示すように、本発明の第一実施形態に係る調光機能付き積層体１（以下、「積層体１」と表記）は、表裏両側でそれぞれ最外層に配置された両ガラスシート２，３と、両ガラスシート２，３の相互間に配置された調光シート４、ガラスシート５、及び樹脂シート６とを備えている。これら複数のシート２〜６について、隣り合うシート同士の相互間には接着層７が介在しており、接着層７により複数のシートが積層一体化されている。 <First Embodiment>
As shown in FIG. 1, the laminated body 1 with a dimming function (hereinafter referred to as “laminated body 1”) according to the first embodiment of the present invention is a double-glazed sheet 2 arranged on both front and back surfaces in the outermost layers. , 3 and a dimming sheet 4, a glass sheet 5, and a resin sheet 6 arranged between the two glass sheets 2 and 3. With respect to these plurality of sheets 2 to 6, an adhesive layer 7 is interposed between adjacent sheets, and the plurality of sheets are laminated and integrated by the adhesive layer 7.

本実施形態では、調光シート４の表側および裏側に隣接して、それぞれガラスシート２，５が配置されている。すなわち、本実施形態では、調光シート４の表側に隣接して配置された表側シート、及び、裏側に隣接して配置された裏側シートを、それぞれガラスシート２，５が構成している。 In the present embodiment, the glass sheets 2 and 5 are arranged adjacent to the front side and the back side of the dimming sheet 4, respectively. That is, in the present embodiment, the glass sheets 2 and 5 constitute the front side sheet arranged adjacent to the front side of the dimming sheet 4 and the back side sheet arranged adjacent to the back side, respectively.

積層体１を構成するガラスシート２，３，５は、無アルカリガラスでなる場合もあるし、化学強化ガラスでなる場合もある。また、ガラスシート２，３，５の一部が無アルカリガラスでなり、残りが化学強化ガラスでなる場合もある。なお、化学強化ガラスでなるシートを使用する場合には、アルミノシリケートガラスのシートを化学強化して用いることができる。化学強化ガラスは、表裏両側又は表裏一方の最外層に配置することが好ましい。なお、ガラスシート２，３，５として、無アルカリガラスおよび化学強化ガラス以外のガラスでなるシートを使用してもよい。 The glass sheets 2, 3 and 5 constituting the laminated body 1 may be made of non-alkali glass or chemically strengthened glass. Further, a part of the glass sheets 2, 3 and 5 may be made of non-alkali glass, and the rest may be made of chemically strengthened glass. When a sheet made of chemically strengthened glass is used, the sheet of aluminosilicate glass can be chemically strengthened and used. The chemically strengthened glass is preferably arranged on both the front and back sides or the outermost layer on the front and back sides. As the glass sheets 2, 3 and 5, sheets made of glass other than non-alkali glass and chemically tempered glass may be used.

ガラスシート２，３，５の厚みは、０．０５ｍｍ〜１．５ｍｍの範囲内である。なお、より好ましくは０．１ｍｍ〜１．３ｍｍの範囲内であり、さらに好ましくは０．２ｍｍ〜１．１ｍｍの範囲内である。 The thickness of the glass sheets 2, 3 and 5 is in the range of 0.05 mm to 1.5 mm. It is more preferably in the range of 0.1 mm to 1.3 mm, and further preferably in the range of 0.2 mm to 1.1 mm.

本実施形態では、ガラスシート２（調光シート４の表側シート）とガラスシート５（調光シート４の裏側シート）との厚みは同一である。しかしながら、この限りではなく、図２に示した第一実施形態の第一変形例のように、両ガラスシート２，５の厚みが異なっていてもよい。或いは、最外層に配置されたガラスシート２、３の厚みを、積層体１の内部に配置されたガラスシート５よりも大きくしてもよい。これにより、樹脂シート６の表側に配置されたガラスシート２、５の厚みの合計と樹脂シート６の裏側に配置されたガラスシート３の厚みの差を低減でき、樹脂シート６の表側と裏側で剛性のバランスが向上するので、積層体の反りを可及的に抑制することが可能となる。 In the present embodiment, the thickness of the glass sheet 2 (the front side sheet of the dimming sheet 4) and the glass sheet 5 (the back side sheet of the dimming sheet 4) are the same. However, this is not limited to this, and the thicknesses of the two glass sheets 2 and 5 may be different as in the first modification of the first embodiment shown in FIG. Alternatively, the thickness of the glass sheets 2 and 3 arranged in the outermost layer may be made larger than that of the glass sheet 5 arranged inside the laminated body 1. As a result, the difference between the total thickness of the glass sheets 2 and 5 arranged on the front side of the resin sheet 6 and the thickness of the glass sheet 3 arranged on the back side of the resin sheet 6 can be reduced, and the front side and the back side of the resin sheet 6 can be reduced. Since the balance of rigidity is improved, it is possible to suppress the warp of the laminated body as much as possible.

また、本実施形態では、最外層に配置された両ガラスシート（ガラスシート２とガラスシート３）の厚みは同一である。しかしながら、この限りではなく、図３に示した第一実施形態の第二変形例のように、両ガラスシート２，３の厚みが異なっていてもよい。具体的には、両ガラスシート２，３のうち、調光シート４が隣接しないガラスシート３の厚みを、調光シート４が隣接するガラスシート２よりも大きくしてもよい。この場合には、ガラスシート３の厚みを、ガラスシート２の厚みの７倍以下とすることが好ましく、６倍以下とすることがより好ましく、４倍以下とすることが最も好ましい。これにより、樹脂シート６の表側に配置されたガラスシート２、５の厚みの合計と樹脂シート６の裏側に配置されたガラスシート３の厚みの差を低減でき、樹脂シート６の表側と裏側で剛性のバランスが向上するので、積層体の反りを可及的に抑制することが可能となる。 Further, in the present embodiment, the thicknesses of both glass sheets (glass sheet 2 and glass sheet 3) arranged in the outermost layer are the same. However, this is not limited to this, and the thicknesses of the two glass sheets 2 and 3 may be different as in the second modification of the first embodiment shown in FIG. Specifically, of the two glass sheets 2 and 3, the thickness of the glass sheet 3 to which the dimming sheet 4 is not adjacent may be made larger than that of the glass sheet 2 to which the dimming sheet 4 is adjacent. In this case, the thickness of the glass sheet 3 is preferably 7 times or less, more preferably 6 times or less, and most preferably 4 times or less the thickness of the glass sheet 2. As a result, the difference between the total thickness of the glass sheets 2 and 5 arranged on the front side of the resin sheet 6 and the thickness of the glass sheet 3 arranged on the back side of the resin sheet 6 can be reduced, and the front side and the back side of the resin sheet 6 can be reduced. Since the balance of rigidity is improved, it is possible to suppress the warp of the laminated body as much as possible.

樹脂シート６の表側に配置されたガラスシート２、５の厚みの合計ｔ１（ｍｍ）と、樹脂シート６の裏側に配置されたガラスシート３の厚みｔ２（ｍｍ）との比（ｔ１／ｔ２）は、例えば２以下とすることができ、１．５以下とすることが好ましく、１．２以下とすることがより好ましい。また、０．４以上とすることが好ましく、０．５以上とすることがより好ましく、０．８以上とすることが最も好ましい。 The ratio (t1 / t2) of the total thickness t1 (mm) of the glass sheets 2 and 5 arranged on the front side of the resin sheet 6 to the thickness t2 (mm) of the glass sheet 3 arranged on the back side of the resin sheet 6. Can be, for example, 2 or less, preferably 1.5 or less, and more preferably 1.2 or less. Further, it is preferably 0.4 or more, more preferably 0.5 or more, and most preferably 0.8 or more.

ガラスシート２（調光シート４の表側シート）とガラスシート５（調光シート４の裏側シート）とは、同一組成（例えば、同一組成の無アルカリガラス同士、化学強化ガラス同士等）であるか、又は、組成が異なっていても、両ガラスシート２，５の熱膨張係数について、大きい方の値が小さい方の値の４倍以下とすることが好ましい。なお、大きい方の値が小さい方の値の３倍以下となることがより好ましい。 Does the glass sheet 2 (front side sheet of the dimming sheet 4) and the glass sheet 5 (back side sheet of the dimming sheet 4) have the same composition (for example, non-alkali glasses having the same composition, chemically strengthened glasses, etc.)? Or, even if the compositions are different, it is preferable that the coefficient of thermal expansion of both glass sheets 2 and 5 is 4 times or less the larger value than the smaller value. It is more preferable that the larger value is 3 times or less of the smaller value.

ここで、ガラスシート２，３，５は、成膜されていてもよく、膜により熱線吸収性、熱線反射性、遮熱性を有していてもよい。 Here, the glass sheets 2, 3 and 5 may be formed into a film, and may have heat ray absorbing property, heat ray reflecting property and heat shielding property depending on the film.

調光シート４としては、例えば、液晶方式、ＳＰＤ方式、サーモクロミック方式、エレクトロクロミック方式、フォトクロミック方式等のシートを使用することが可能である。本実施形態では、液晶方式の調光シート４を使用している。この調光シート４は、電源のオン・オフの切り換えに伴って光の透過率が調節されるシートである。ここで、調光シート４としては、省エネルギーの観点から、非通電時に透過率が上がり、通電時に透過率が下がるリバースモードタイプを使用することが好ましい。しかしながら、これには限定されず、通電時に透過率が上がり、非通電時に透過率が下がるノーマルモードタイプを使用してもよい。 As the dimming sheet 4, for example, a liquid crystal system, an SPD system, a thermochromic system, an electrochromic system, a photochromic system, or the like can be used. In this embodiment, a liquid crystal type dimming sheet 4 is used. The dimming sheet 4 is a sheet whose light transmittance is adjusted by switching the power on / off. Here, as the light control sheet 4, from the viewpoint of energy saving, it is preferable to use a reverse mode type in which the transmittance increases when the light is off and the transmittance decreases when the light is energized. However, the present invention is not limited to this, and a normal mode type may be used in which the transmittance increases when energized and decreases when de-energized.

調光シート４は、それぞれに透明導電膜が成膜された二枚の基材シートを平行に対向させて配置すると共に、両基材シートの相互間に液晶を封入してなるシートである。この調光シート４は可撓性を有しており、調光シート４の厚みは、例えば２００μｍ以下である。なお、基材シートの材質としては、例えば、ＰＥＴ（ポリエチレンテレフタレート）を採用することが可能である。また、基材シートの厚みは、例えば１００μｍ以下である。 The light control sheet 4 is a sheet formed by arranging two base sheets on which a transparent conductive film is formed so as to face each other in parallel and enclosing a liquid crystal between the two base sheets. The light control sheet 4 has flexibility, and the thickness of the light control sheet 4 is, for example, 200 μm or less. As the material of the base sheet, for example, PET (polyethylene terephthalate) can be adopted. The thickness of the base sheet is, for example, 100 μm or less.

なお、サーモクロミック方式の調光シートを用いる場合、調光シートに外部環境の熱が伝わりやすいので、本実施形態のように、表側の最外層に配置されたガラスシート２に隣接させて調光シートを配置することが好ましい。 When a thermochromic dimming sheet is used, the heat of the external environment is easily transferred to the dimming sheet. Therefore, as in the present embodiment, dimming is performed adjacent to the glass sheet 2 arranged on the outermost layer on the front side. It is preferable to arrange the sheet.

樹脂シート６の材質としては、例えば、ポリカーボネート、アクリル、ＰＥＴを採用することが可能である。樹脂シート６の厚みは、ガラスシート２，３，５の厚みの２〜３０倍とすることが好ましく、具体的には０．５ｍｍ〜３０ｍｍの範囲内とすることが好ましい。 As the material of the resin sheet 6, for example, polycarbonate, acrylic, or PET can be adopted. The thickness of the resin sheet 6 is preferably 2 to 30 times the thickness of the glass sheets 2, 3 and 5, and specifically, it is preferably in the range of 0.5 mm to 30 mm.

接着層７は、ホットメルトタイプや粘着シートタイプの接着剤でなる。ホットメルトタイプの接着剤としては、ＥＶＡ（エチレン酢酸ビニル共重合体）やＴＰＵ（熱可塑性ポリウレタン樹脂）を使用することが可能である。一方、粘着シートタイプの接着剤としては、例えば、光学用透明粘着剤を使用することが可能である。なお、接着層７は紫外線遮蔽機能を有することが好ましい。また、接着層７の厚みは、０．０２ｍｍ〜１．０ｍｍの範囲内とすることが好ましい。 The adhesive layer 7 is made of a hot melt type adhesive or an adhesive sheet type adhesive. As the hot melt type adhesive, EVA (ethylene vinyl acetate copolymer) or TPU (thermoplastic polyurethane resin) can be used. On the other hand, as the pressure-sensitive adhesive sheet type adhesive, for example, an optical transparent pressure-sensitive adhesive can be used. The adhesive layer 7 preferably has an ultraviolet shielding function. The thickness of the adhesive layer 7 is preferably in the range of 0.02 mm to 1.0 mm.

本実施形態では、調光シート４の表面と接着した接着層７ａと、裏面と接着した接着層７ｂとの厚みが同一である。しかしながら、この限りではなく、図４に示した第一実施形態の第三変形例や、図５に示した第一実施形態の第四変形例（積層体１の表裏を逆にした形態）のように、両接着層７ａ，７ｂの厚みが異なっていてもよい。具体的には、両接着層７ａ，７ｂのうち、光の入射側に配置された接着層７ａの方が、接着層７ｂよりも厚みが大きくてもよい。なお、両接着層７ａ，７ｂは、同一の接着剤でなってもよいし、異なる接着剤でなってもよい。図４の第三変形例は、外部環境の熱が調光シートに伝導し難いことから、熱によって変質しやすいエレクトロクロミック方式の調光シートを用いる場合に好適である。 In the present embodiment, the thickness of the adhesive layer 7a adhered to the front surface of the light control sheet 4 and the thickness of the adhesive layer 7b adhered to the back surface are the same. However, this is not limited to this, and the third modification of the first embodiment shown in FIG. 4 and the fourth modification of the first embodiment shown in FIG. 5 (a form in which the front and back sides of the laminated body 1 are reversed) As described above, the thicknesses of both adhesive layers 7a and 7b may be different. Specifically, of the two adhesive layers 7a and 7b, the adhesive layer 7a arranged on the incident side of the light may be thicker than the adhesive layer 7b. Both the adhesive layers 7a and 7b may be made of the same adhesive or different adhesives. The third modification of FIG. 4 is suitable for using an electrochromic light control sheet that is easily altered by heat because the heat of the external environment is difficult to conduct to the light control sheet.

以下、本発明の他の実施形態に係る調光機能付き積層体について説明する。なお、他の実施形態の説明において、上記の第一実施形態で説明済みの要素と実質的に同一の要素については、同一の符号を付すことで重複する説明を省略し、第一実施形態との相違点についてのみ説明する。 Hereinafter, the laminated body with a dimming function according to another embodiment of the present invention will be described. In the description of the other embodiments, the elements that are substantially the same as the elements described in the above-described first embodiment are designated by the same reference numerals, so that the duplicated description is omitted and the elements are the same as those of the first embodiment. Only the differences between the above will be described.

＜第二実施形態＞
図６に示すように、第二実施形態に係る積層体１が、上記の第一実施形態と相違している点は、調光シート４に加えて、新たな調光シート８が配置されている点と、調光シート８の表側および裏側に隣接して、それぞれガラスシート３，９が配置されている点と、積層体１の厚み方向の中央を基準として、表側と裏側とが対称な構成となっている点である。 <Second embodiment>
As shown in FIG. 6, the difference between the laminated body 1 according to the second embodiment and the first embodiment is that a new dimming sheet 8 is arranged in addition to the dimming sheet 4. The front side and the back side are symmetrical with respect to the point where the glass sheets 3 and 9 are arranged adjacent to the front side and the back side of the dimming sheet 8 and the center in the thickness direction of the laminated body 1. It is a point that is composed.

調光シート８、ガラスシート９は、それぞれ調光シート４、ガラスシート２と同一の構成を有する。第二実施形態では、ガラスシート２、９が、最外層に配置された両ガラスシートであり、調光シート４の表側シートがガラスシート２であり、調光シート４の裏側シートがガラスシート５であり、調光シート８の表側シートがガラスシート３であり、調光シート４の裏側シートがガラスシート９である。この積層体１においては、二つの調光シート４，８により、二段階の調光が可能となっている。なお、二つの調光シート４，８は、白色と黒色などの異種のものを組み合わせてもよい。 The dimming sheet 8 and the glass sheet 9 have the same configuration as the dimming sheet 4 and the glass sheet 2, respectively. In the second embodiment, the glass sheets 2 and 9 are both glass sheets arranged in the outermost layer, the front side sheet of the dimming sheet 4 is the glass sheet 2, and the back side sheet of the dimming sheet 4 is the glass sheet 5. The front side sheet of the dimming sheet 8 is the glass sheet 3, and the back side sheet of the dimming sheet 4 is the glass sheet 9. In this laminated body 1, two dimming sheets 4 and 8 enable two-step dimming. The two dimming sheets 4 and 8 may be combined with different types such as white and black.

＜第三実施形態＞
図７に示すように、第三実施形態に係る積層体１が、上記の第一実施形態と相違している点は、調光シート４の表側および裏側に隣接して、それぞれ樹脂シート１０，１１が配置されている点と、積層体１の厚み方向の中央を基準として、表側と裏側とが対称な構成となっている点である。 <Third Embodiment>
As shown in FIG. 7, the laminate 1 according to the third embodiment differs from the first embodiment described above in that the resin sheets 10 and 10 are adjacent to the front side and the back side of the dimming sheet 4, respectively. The point where 11 is arranged and the point where the front side and the back side are symmetrical with respect to the center in the thickness direction of the laminated body 1.

本実施形態では、調光シート４の表側シート及び裏側シートを、それぞれ樹脂シート１０，１１が構成している。両樹脂シート１０、１１の材質は、上記の樹脂シート６と同一である。 In the present embodiment, the front side sheet and the back side sheet of the dimming sheet 4 are composed of resin sheets 10 and 11, respectively. The materials of both resin sheets 10 and 11 are the same as those of the resin sheet 6 described above.

本実施形態では、樹脂シート１０と樹脂シート１１との厚みが同一である。しかしながら、この限りではなく、図８に示した第三実施形態の第一変形例のように、両樹脂シート１０，１１の厚みが異なっていてもよい。この場合、厚い樹脂シート１０が積層体１の芯材として作用し、積層体１の十分な強度を確保できる。また、薄い樹脂シート１１により積層体１の厚みの不当な増大を防止できる。 In the present embodiment, the thicknesses of the resin sheet 10 and the resin sheet 11 are the same. However, this is not limited to this, and the thicknesses of the resin sheets 10 and 11 may be different as in the first modification of the third embodiment shown in FIG. In this case, the thick resin sheet 10 acts as a core material of the laminated body 1, and sufficient strength of the laminated body 1 can be secured. Further, the thin resin sheet 11 can prevent an unreasonable increase in the thickness of the laminated body 1.

また、本実施形態では、調光シート４の表面と接着した接着層７ａと、裏面と接着した接着層７ｂとの厚みが同一である。しかしながら、この限りではなく、図９に示した第三実施形態の第二変形例のように、両接着層７ａ，７ｂの厚みが異なっていてもよい（本変形例では、両樹脂シート１０，１１の厚みも異なる）。具体的には、両接着層７ａ，７ｂのうち、光の入射側に配置された接着層７ａの方が、接着層７ｂよりも厚みが大きくてもよい。 Further, in the present embodiment, the thickness of the adhesive layer 7a adhered to the front surface of the light control sheet 4 and the thickness of the adhesive layer 7b adhered to the back surface are the same. However, this is not limited to this, and the thicknesses of the adhesive layers 7a and 7b may be different as in the second modification of the third embodiment shown in FIG. 9 (in this modification, both resin sheets 10 and 10). The thickness of 11 is also different). Specifically, of the two adhesive layers 7a and 7b, the adhesive layer 7a arranged on the incident side of the light may be thicker than the adhesive layer 7b.

＜第四実施形態＞
図１０に示すように、第四実施形態に係る積層体１が、上記の第一実施形態と相違している点は、調光シート４に加えて、新たな調光シート１２が配置されている点と、調光シート４の表側および裏側に隣接して、それぞれ樹脂シート１３，１４が配置されると共に、調光シート１２の表側および裏側に隣接して、それぞれ樹脂シート１４，１５が配置されている点と、積層体１の厚み方向の中央を基準として、表側と裏側とが対称な構成となっている点である。 <Fourth Embodiment>
As shown in FIG. 10, the difference between the laminated body 1 according to the fourth embodiment and the first embodiment is that a new dimming sheet 12 is arranged in addition to the dimming sheet 4. Resin sheets 13 and 14 are arranged adjacent to the front side and the back side of the dimming sheet 4, and resin sheets 14 and 15 are arranged adjacent to the front side and the back side of the dimming sheet 12, respectively. The point is that the front side and the back side are symmetrical with respect to the center in the thickness direction of the laminated body 1.

調光シート１２は、調光シート４と同一の構成を有する。また、樹脂シート１３〜１５の材質は、上記の樹脂シート６と同一である。第四実施形態では、調光シート４の表側シートが樹脂シート１３であり、調光シート４の裏側シート及び調光シート１２の表側シートが樹脂シート１４であり、調光シート１２の裏側シートが樹脂シート１５である。この積層体１においては、二つの調光シート４，１２により、二段階の調光が可能となっている。なお、二つの調光シート４，８は、白色と黒色などの異種のものを組み合わせてもよい。 The dimming sheet 12 has the same configuration as the dimming sheet 4. The materials of the resin sheets 13 to 15 are the same as those of the resin sheet 6 described above. In the fourth embodiment, the front side sheet of the dimming sheet 4 is the resin sheet 13, the back side sheet of the dimming sheet 4 and the front side sheet of the dimming sheet 12 are the resin sheet 14, and the back side sheet of the dimming sheet 12 is. The resin sheet 15. In this laminated body 1, two dimming sheets 4 and 12 enable two-step dimming. The two dimming sheets 4 and 8 may be combined with different types such as white and black.

本実施形態では、樹脂シート１３〜１５の厚みが相互に同一である。しかしながら、この限りではなく、図１１に示した第四実施形態の変形例のように、樹脂シート１３〜１５の厚みが異なっていてもよい。具体的には、樹脂シート１３〜１５のうち、積層体１の厚み方向の中央に位置した樹脂シート１４の厚みが、両樹脂シート１３，１５の厚みよりも大きくてもよい。 In this embodiment, the thicknesses of the resin sheets 13 to 15 are the same as each other. However, the thickness of the resin sheets 13 to 15 may be different as in the modified example of the fourth embodiment shown in FIG. Specifically, among the resin sheets 13 to 15, the thickness of the resin sheet 14 located at the center in the thickness direction of the laminated body 1 may be larger than the thickness of both resin sheets 13 and 15.

本発明の実施例として、以下の［表１］〜［表９］に示した構造を有する９種の調光機能付き積層体をそれぞれ作製し、比較例として、以下の［表１０］に示した構造を有する調光機能付き積層体を作製した。これらの積層体における調光シートの機能低下や破損の有無について検証を行った。 As an example of the present invention, nine kinds of laminates with a dimming function having the structures shown in the following [Table 1] to [Table 9] were prepared, and as a comparative example, they are shown in the following [Table 10]. A laminated body with a dimming function having a similar structure was produced. It was verified whether or not the function of the dimming sheet was deteriorated or damaged in these laminated bodies.

以下の［表１］〜［表１０］においては、上段が「表側」であり、下段が「裏側」である。例えば、［表１］に示した構造の調光機能付き積層体においては、表側から裏側に向かって順番にガラスシート、接着層、調光シート、接着層、ガラスシート、接着層、樹脂シート、接着層、ガラスシートが配置されている。また、表中の「ＣＴＥ」は、ガラスシートでは３０℃〜３８０℃における平均熱膨張係数を表し、樹脂シートでは２０℃〜１２０℃における平均熱膨張係数を表している。なお、［表１］〜［表９］に示した構造の調光機能付き積層体は、それぞれ実施例１〜９に該当し、［表１０］に示した構造の調光機能付き積層体は、比較例に該当する。 In the following [Table 1] to [Table 10], the upper row is the "front side" and the lower row is the "back side". For example, in the laminated body with a dimming function having the structure shown in [Table 1], the glass sheet, the adhesive layer, the dimming sheet, the adhesive layer, the glass sheet, the adhesive layer, and the resin sheet are sequentially arranged from the front side to the back side. An adhesive layer and a glass sheet are arranged. Further, "CTE" in the table represents an average coefficient of thermal expansion at 30 ° C. to 380 ° C. for a glass sheet and an average coefficient of thermal expansion at 20 ° C. to 120 ° C. for a resin sheet. The laminated bodies with a dimming function having the structures shown in [Table 1] to [Table 9] correspond to Examples 1 to 9, respectively, and the laminated bodies having a dimming function having the structures shown in [Table 10] correspond to Examples 1 to 9, respectively. , Corresponds to the comparative example.

［実施例１］

Figure 0006887618
[Example 1]
Figure 0006887618

［実施例２］

Figure 0006887618
[Example 2]
Figure 0006887618

［実施例３］

Figure 0006887618
[Example 3]
Figure 0006887618

［実施例４］

Figure 0006887618
[Example 4]
Figure 0006887618

［実施例５］

Figure 0006887618
[Example 5]
Figure 0006887618

［実施例６］

Figure 0006887618
[Example 6]
Figure 0006887618

［実施例７］

Figure 0006887618
[Example 7]
Figure 0006887618

［実施例８］

Figure 0006887618
[Example 8]
Figure 0006887618

［実施例９］

Figure 0006887618
[Example 9]
Figure 0006887618

［比較例］

Figure 0006887618
[Comparison example]
Figure 0006887618

実施例１〜９及び比較例の調光機能付き積層体（５００ｍｍ×５００ｍｍ）に、６０℃で３０分保持する保温処理と−１０℃で３０分保持する保冷処理とを交互に１０回繰り返し施すことにより、熱膨張係数の差に起因する応力を付与した。保温処理及び保冷処理を経た積層体を格子状に１００ｍｍ×１００ｍｍで２５個に区分けし、各区画の面中心を調光特性の評価部に設定した。 The laminated body with dimming function (500 mm × 500 mm) of Examples 1 to 9 and Comparative Example is alternately repeatedly subjected to a heat insulation treatment of holding at 60 ° C. for 30 minutes and a cold insulation treatment of holding at −10 ° C. for 30 minutes 10 times. As a result, stress due to the difference in the coefficient of thermal expansion was applied. The laminates that had undergone the heat insulation treatment and the cold insulation treatment were divided into 25 pieces in a grid pattern of 100 mm × 100 mm, and the surface center of each section was set as the evaluation unit of the dimming characteristic.

調光シートが液晶方式、ＳＰＤ方式又はエレクトロクロミック方式である場合、調光シートを調光状態（遮光状態）にして各サンプル（積層体）の表側から３０，０００ｌｘの照明を裏側に向けて常温で照射し、各区画の面中心を通過してくる光の照度（ｌｘ）を測定した。調光シートがサーモクロミック方式である場合、各サンプル（積層体）の表側から３０，０００ｌｘの照明を裏側に向けて常温で照射し、各区画の面中心を通過してくる光の照度（ｌｘ）を測定した。その際、雰囲気温度を６０℃として調光シートを調光状態（遮光状態）にした。なお、いずれの方式でも、照明を照射した際に調光機能が消失していた場合は、破損とした。 When the dimming sheet is a liquid crystal system, SPD system, or electrochromic system, the dimming sheet is placed in a dimming state (light-shielding state) and 30,000 lux of illumination is directed from the front side of each sample (laminate) to the back side at room temperature. The illuminance (lux) of the light passing through the center of the surface of each section was measured. When the dimming sheet is of the thermochromic method, 30,000 lux of illumination from the front side of each sample (laminated body) is irradiated toward the back side at room temperature, and the illuminance of light passing through the center of the surface of each section (lpx). ) Was measured. At that time, the atmospheric temperature was set to 60 ° C. and the dimming sheet was put into a dimming state (light-shielding state). In any of the methods, if the dimming function was lost when the light was applied, it was considered to be damaged.

各区画から得た２５個の照度の測定値から最大値、最小値及び平均値を求め、平均値に対して最大値と最小値の差が占める割合が１５％以下である場合に機能低下なしとし、１５％を上回る場合に機能低下ありとした。 The maximum value, minimum value, and average value are obtained from the measured values of 25 illuminances obtained from each section, and there is no functional deterioration when the ratio of the difference between the maximum value and the minimum value to the average value is 15% or less. When it exceeds 15%, it is considered that there is a functional deterioration.

［表１］〜［表９］に示した実施例１〜９では、調光シートの機能低下や破損は確認されなかった。これに対し、［表１０］に示した比較例では、調光シートを構成する基材シートが剥離してしまい、調光シートが破損するに至った。これは、調光シートの表側に隣接して配置されたガラスシートの熱膨張係数の大きさに対し、裏側に隣接して配置された樹脂シートの熱膨張係数の大きさが、約１７倍と大きいことに起因するものと想定される。 In Examples 1 to 9 shown in [Table 1] to [Table 9], no functional deterioration or damage of the dimming sheet was confirmed. On the other hand, in the comparative example shown in [Table 10], the base material sheet constituting the dimming sheet was peeled off, and the dimming sheet was damaged. This is because the size of the coefficient of thermal expansion of the resin sheet placed adjacent to the back side is about 17 times larger than the size of the coefficient of thermal expansion of the glass sheet placed adjacent to the front side of the dimming sheet. It is assumed that it is due to its large size.

以上のことから、本発明に係る調光機能付き積層体によれば、調光シートの機能低下や破損を回避することが可能になるものと推認される。 From the above, it is presumed that according to the laminated body with a dimming function according to the present invention, it is possible to avoid functional deterioration and damage of the dimming sheet.

１ 調光機能付き積層体
２ ガラスシート
３ ガラスシート
４ 調光シート
５ ガラスシート
６ 樹脂シート
７ 接着層
７ａ 接着層
７ｂ 接着層
８ 調光シート
９ ガラスシート
１０ 樹脂シート
１１ 樹脂シート
１２ 調光シート
１３ 樹脂シート
１４ 樹脂シート
１５ 樹脂シート 1 Laminate with dimming function 2 Glass sheet 3 Glass sheet 4 Dimming sheet 5 Glass sheet 6 Resin sheet 7 Adhesive layer 7a Adhesive layer 7b Adhesive layer 8 Dimming sheet 9 Glass sheet 10 Resin sheet 11 Resin sheet 12 Dimming sheet 13 Resin sheet 14 Resin sheet 15 Resin sheet

Claims (13)

表裏両側でそれぞれ最外層に配置された両ガラスシートと、該両ガラスシートの相互間に配置された樹脂シート及び調光シートとを含む複数のシートを備え、該複数のシートが隣り合うシート同士の相互間に介在した接着層により積層一体化された調光機能付き積層体であって、
前記調光シートの表側に隣接して配置された表側シートと、裏側に隣接して配置された裏側シートとが、共にガラスシート、又は、共に樹脂シートであることを特徴とする調光機能付き積層体。 A plurality of sheets including both glass sheets arranged on the outermost layers on both the front and back surfaces and a resin sheet and a dimming sheet arranged between the two glass sheets are provided, and the plurality of sheets are adjacent to each other. It is a laminated body with a dimming function that is laminated and integrated by an adhesive layer interposed between the two.
With a dimming function, the front side sheet arranged adjacent to the front side of the dimming sheet and the back side sheet arranged adjacent to the back side are both glass sheets or both resin sheets. Laminated body. 前記表側シートと前記裏側シートとの熱膨張係数について、大きい方の値が小さい方の値の４倍以下であることを特徴とする請求項１に記載の調光機能付き積層体。 The laminated body with a dimming function according to claim 1, wherein the larger value of the coefficient of thermal expansion of the front side sheet and the back side sheet is 4 times or less of the smaller value. 前記表側シートと前記裏側シートとの組成が、同一であることを特徴とする請求項１又は２に記載の調光機能付き積層体。 The laminate with a dimming function according to claim 1 or 2, wherein the front side sheet and the back side sheet have the same composition. 前記表側シートと前記裏側シートとの厚みが、同一であることを特徴とする請求項１〜３のいずれかに記載の調光機能付き積層体。 The laminate with a dimming function according to any one of claims 1 to 3, wherein the front side sheet and the back side sheet have the same thickness. 前記表側シートと前記裏側シートとの厚みが、異なることを特徴とする請求項１〜３のいずれかに記載の調光機能付き積層体。 The laminate with a dimming function according to any one of claims 1 to 3, wherein the front side sheet and the back side sheet have different thicknesses. 前記最外層に配置された両ガラスシートの厚みが、同一であることを特徴とする請求項１〜５のいずれかに記載の調光機能付き積層体。 The laminate with a dimming function according to any one of claims 1 to 5, wherein both glass sheets arranged in the outermost layer have the same thickness. 前記最外層に配置された両ガラスシートの厚みが、異なることを特徴とする請求項１〜５のいずれかに記載の調光機能付き積層体。 The laminate with a dimming function according to any one of claims 1 to 5, wherein the thicknesses of the two glass sheets arranged on the outermost layer are different. 前記接着層が、紫外線遮蔽機能を有することを特徴とする請求項１〜７のいずれかに記載の調光機能付き積層体。 The laminate with a dimming function according to any one of claims 1 to 7, wherein the adhesive layer has an ultraviolet shielding function. 前記調光シートの表面と接着した前記接着層と裏面と接着した前記接着層との厚みが、異なることを特徴とする請求項８に記載の調光機能付き積層体。 The laminate with a dimming function according to claim 8, wherein the adhesive layer adhered to the front surface of the dimming sheet and the adhesive layer adhered to the back surface have different thicknesses. 当該調光機能付き積層体を構成するガラスシートの厚みが、０．０５ｍｍ〜１．５ｍｍの範囲内であることを特徴とする請求項１〜９のいずれかに記載の調光機能付き積層体。 The laminate with a dimming function according to any one of claims 1 to 9, wherein the thickness of the glass sheet constituting the laminate with a dimming function is within the range of 0.05 mm to 1.5 mm. .. 当該調光機能付き積層体を構成するガラスシートが、無アルカリガラス又は化学強化ガラスでなるシートであるか、或いは、無アルカリガラスでなるシートと化学強化ガラスでなるシートとを含んでいることを特徴とする請求項１〜１０のいずれかに記載の調光機能付き積層体。 The glass sheet constituting the laminated body with a dimming function is a sheet made of non-alkali glass or chemically tempered glass, or includes a sheet made of non-alkali glass and a sheet made of chemically strengthened glass. The laminate with a dimming function according to any one of claims 1 to 10. 前記調光シートが、可撓性を有する液晶方式のシートであることを特徴とする請求項１〜１１のいずれかに記載の調光機能付き積層体。 The laminate with a dimming function according to any one of claims 1 to 11, wherein the dimming sheet is a flexible liquid crystal type sheet. 前記調光シートが、可撓性を有するＳＰＤ方式のシートであることを特徴とする請求項１〜１１のいずれかに記載の調光機能付き積層体。 The laminate with a dimming function according to any one of claims 1 to 11, wherein the dimming sheet is a flexible SPD type sheet.
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