JPH0588144A - Liquid crystal antidazzle mirror - Google Patents
Liquid crystal antidazzle mirrorInfo
- Publication number
- JPH0588144A JPH0588144A JP3251997A JP25199791A JPH0588144A JP H0588144 A JPH0588144 A JP H0588144A JP 3251997 A JP3251997 A JP 3251997A JP 25199791 A JP25199791 A JP 25199791A JP H0588144 A JPH0588144 A JP H0588144A
- Authority
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- Japan
- Prior art keywords
- liquid crystal
- mirror
- voltage
- state
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、特にバックミラー等の
車載用ミラーに好適に使用される防眩ミラーに関し、よ
り詳細には、液晶素子による調光作用を利用した液晶防
眩ミラーに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antiglare mirror which is preferably used as a vehicle-mounted mirror such as a rearview mirror, and more particularly to a liquid crystal antiglare mirror which utilizes a dimming effect of a liquid crystal element. Is.
【0002】[0002]
【従来の技術と発明が解決しようとする課題】従来の液
晶防眩ミラーとしては、例えば、固化した樹脂マトリッ
クス中に液晶物質が分散保持された液晶層を、透明電極
を設けた一対の透明基板で挟着した構造の液晶素子(調
光材)を、鏡体と重ね合わせたもの(実開平2−756
01号公報参照)や、多色性染料を含む低複屈折性の、
作用的にネマチックな液晶の塊または粒状体を、その自
然な構造を歪ませた状態で、透明樹脂等からなる封じ込
め媒体中に封じ込めた液晶素子を、鏡体と組み合わせた
もの(特開昭62−283316号公報参照)等があ
る。2. Description of the Related Art As a conventional liquid crystal antiglare mirror, for example, a pair of transparent substrates provided with a transparent electrode having a liquid crystal layer in which a liquid crystal substance is dispersed and held in a solidified resin matrix. A liquid crystal element (light control material) having a structure sandwiched between the two is superposed on a mirror body (actually, it is 2-756
No. 01), low birefringence including a polychromatic dye,
A combination of a liquid crystal element in which a lump or a granular material of an operationally nematic liquid crystal is confined in a confinement medium composed of a transparent resin or the like in a state in which its natural structure is distorted, and a mirror body (JP-A-62-62 No. 283316).
【0003】前者の液晶防眩ミラーは、液晶層が、電圧
を印加した際に光透過状態となり、電圧を印加しない際
に光散乱状態となることを利用して、鏡体の光の反射率
を調整するものである。また、後者の液晶防眩ミラー
は、液晶の塊または粒状体に電圧を印加すると、液晶
が、前記のように歪んだ状態からきれいに整列した状態
に変化すること、および、液晶が歪んだ状態では液晶の
塊または粒状体に含まれる多色性染料が多量の光を吸収
するが、液晶がきれいに整列した状態では光吸収が最小
となることを利用して、鏡体の光の反射率を調整するも
のである。The former liquid crystal anti-glare mirror utilizes the fact that the liquid crystal layer is in a light transmitting state when a voltage is applied and is in a light scattering state when no voltage is applied, which makes use of the light reflectance of the mirror body. To adjust. Further, the latter liquid crystal anti-glare mirror, when a voltage is applied to the lumps or particles of the liquid crystal, the liquid crystal changes from the distorted state as described above to a neatly aligned state, and in the distorted state of the liquid crystal. The polychromatic dye contained in the lumps or granules of liquid crystal absorbs a large amount of light, but the light absorption is minimal when the liquid crystal is neatly aligned, and the light reflectance of the mirror body is adjusted. To do.
【0004】ところが、車載用ミラー等は、日中に、非
防眩状態(透明状態)で連続使用される場合の方が多い
ため、上記従来の液晶防眩ミラーのように、液晶素子の
光透過状態を保ち、鏡体の光の反射率を最大の状態に維
持するべく、液晶素子に電圧を印加し続ける必要がある
ものは、消費電力の点から経済的に好ましくないという
問題があった。However, in-vehicle mirrors and the like are often used continuously in a non-glare state (transparent state) during the day, and therefore, like the conventional liquid crystal glare mirrors described above, the light from the liquid crystal element is not used. There is a problem in that it is economically unfavorable from the viewpoint of power consumption that the liquid crystal element needs to be continuously applied with a voltage in order to maintain the transmission state and maintain the light reflectance of the mirror body at the maximum state. ..
【0005】また、印加電圧が変動すると、液晶素子の
光透過状態にバラツキを生じてミラーが見えにくくなる
上、何等かのアクシデントで印加電圧が停止すると、液
晶素子が光散乱状態となって、ミラーが全く見えなくな
る危険性がある等、上記従来の液晶防眩ミラーは、信頼
性の点でも問題があった。本発明は、上述の技術的課題
を解決し、信頼性に優れるとともに、消費電力等の点で
経済的に優れた液晶防眩ミラーを提供することを目的と
している。Further, when the applied voltage fluctuates, the light transmission state of the liquid crystal element varies, and the mirror becomes difficult to see, and when the applied voltage is stopped due to some accident, the liquid crystal element becomes in a light scattering state. The conventional liquid crystal anti-glare mirror described above has a problem in terms of reliability, such as a risk that the mirror cannot be seen at all. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above technical problems and to provide a liquid crystal antiglare mirror which is excellent in reliability and economically excellent in terms of power consumption and the like.
【0006】[0006]
【課題を解決するための手段および作用】上記課題を解
決するための、本発明の液晶防眩ミラーは、電圧印加時
に光散乱状態、非印加時に光透過状態となる液晶素子を
鏡体表面の少なくとも一部に設けたことを特徴とする。
液晶素子としては、スポンジ構造になったマトリックス
高分子の孔内に液晶が充填された構造を有する複合膜
(以下「高分子/液晶複合膜」という)を備えたものが
好適に使用される。この液晶素子は、無電圧時には、孔
内の液晶分子がランダムな状態にあり、電圧が印加され
ると、Δε>0〔但し、Δεは誘電率異方性であって、
式:In order to solve the above-mentioned problems, the liquid crystal antiglare mirror of the present invention has a liquid crystal element which is in a light-scattering state when a voltage is applied and is in a light-transmitting state when no voltage is applied. It is characterized in that it is provided at least in part.
As the liquid crystal element, one provided with a composite film (hereinafter referred to as “polymer / liquid crystal composite film”) having a structure in which liquid crystal is filled in the pores of a matrix polymer having a sponge structure is preferably used. In this liquid crystal element, the liquid crystal molecules in the pores are in a random state when no voltage is applied, and when a voltage is applied, Δε> 0 [where Δε is a dielectric anisotropy,
formula:
【0007】[0007]
【数1】 [Equation 1]
【0008】で表される(なお、It is represented by (note that
【0009】[0009]
【外1】 [Outer 1]
【0010】は分子軸方向の誘電率、Is the dielectric constant in the molecular axis direction,
【0011】[0011]
【外2】 [Outside 2]
【0012】は分子軸に対して直交方向の誘電率を示
す)〕のとき、電気光学効果によって液晶分子が電場方
向に配向する。通常は、電圧が印加されず、孔内の液晶
分子がランダムな状態のとき、入射光が散乱されるので
高分子/液晶複合膜は不透明な状態となり、電圧が印加
されて液晶分子が電場方向に配向したとき、光透過状態
となる。しかし、本発明者らの検討によれば、液晶材料
の屈折率と、高分子の屈折率とが、電圧印加時に、Indicates the dielectric constant in the direction orthogonal to the molecular axis)], the liquid crystal molecules are aligned in the direction of the electric field by the electro-optical effect. Normally, when no voltage is applied and the liquid crystal molecules in the pores are in a random state, the incident light is scattered and the polymer / liquid crystal composite film is in an opaque state. When it is oriented to, it becomes a light transmitting state. However, according to the study by the present inventors, the refractive index of the liquid crystal material and the refractive index of the polymer are
【0013】[0013]
【数2】 [Equation 2]
【0014】〔但し、上記式中ηP は高分子の屈折率を
示し、ηLCは液晶材料の屈折率を示す〕となり、非印加
時には、[Wherein η P represents the refractive index of the polymer and η LC represents the refractive index of the liquid crystal material], and when no voltage is applied,
【0015】[0015]
【数3】 [Equation 3]
【0016】〔但し、上記式中ηP は前記と同じく高分
子の屈折率、[Wherein η P is the refractive index of the polymer as described above,
【0017】[0017]
【外3】 [Outside 3]
【0018】は液晶の分子軸方向の屈折率、Is the refractive index of the liquid crystal in the molecular axis direction,
【0019】[0019]
【外4】 [Outside 4]
【0020】は液晶の分子軸に対して直交方向の屈折率
を示す〕となるように、高分子種、液晶種の選定を行
い、配合を設計すると、逆に、高分子/液晶複合膜を、
電圧印加時に光散乱状態、非印加時に光透過状態にでき
ることを見出したのである。すなわち、かかる液晶素子
においては、電圧印加時に、マトリックス高分子と液晶
の屈折率が不一致となって、両者の界面で光が乱反射さ
れるため光散乱状態となり、非印加時には、マトリック
ス高分子と液晶の屈折率が一致して光透過状態となる。Is the refractive index in the direction orthogonal to the molecular axis of the liquid crystal], the polymer type and the liquid crystal type are selected and the composition is designed. Conversely, the polymer / liquid crystal composite film is formed. ,
It has been found that a light scattering state can be achieved when a voltage is applied, and a light transmission state can be achieved when no voltage is applied. That is, in such a liquid crystal element, when a voltage is applied, the refractive index of the matrix polymer and the liquid crystal become inconsistent, and light is diffusely reflected at the interface between the two, resulting in a light scattering state. The refractive indexes of the two coincide with each other, and the light is transmitted.
【0021】したがって、上記液晶素子を備えた本発明
の液晶防眩ミラーは、非防眩状態において、印加電圧の
変動や停止によってミラーが見えにくくなるおそれがな
く、信頼性が高い上、非防眩状態で高反射率を得ること
ができる。また、本発明の液晶防眩ミラーは、上記のよ
うに、電圧非印加時に非防眩状態を維持するものである
ため、例えば日中に、非防眩状態(透明状態)で連続使
用される場合に、電圧を印加する必要がないので、消費
電力等の点で経済的に優れたものとなる。Therefore, the liquid crystal anti-glare mirror of the present invention equipped with the above liquid crystal element has high reliability and high reliability in the non-anti-glare state without the fear that the mirror becomes difficult to see due to fluctuations or stoppage of the applied voltage. High reflectance can be obtained in a dazzling state. Further, since the liquid crystal anti-glare mirror of the present invention maintains the non-anti-glare state when no voltage is applied as described above, it is continuously used in the non-anti-glare state (transparent state) during the day, for example. In this case, since it is not necessary to apply a voltage, it becomes economically superior in terms of power consumption and the like.
【0022】しかも、上記高分子/液晶複合膜は、マト
リックス高分子を含むため、これを支持体間に充填した
とき、スペーサ等を用いなくてもセル間隔を保持する程
度の自己支持性を持たせることができるという利点もあ
る。Moreover, since the polymer / liquid crystal composite film contains a matrix polymer, when it is filled between supports, it has a self-supporting property such that the cell spacing can be maintained without using a spacer or the like. There is also an advantage that it can be done.
【0023】[0023]
【実施例】以下、実施例を示す添付図面によって本発明
を説明する。図1は、本発明の液晶防眩ミラーの一実施
例を示す断面図である。図に見るように、この実施例の
液晶防眩ミラーは、片面に透明電極2,2が形成された
一対の透明基材3,3にて、高分子/液晶複合膜1を挟
着した構造の液晶素子Lを、接着層4を介して鏡体Mに
積層一体化したものである。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the accompanying drawings showing embodiments. FIG. 1 is a sectional view showing an embodiment of the liquid crystal antiglare mirror of the present invention. As shown in the figure, the liquid crystal antiglare mirror of this embodiment has a structure in which a polymer / liquid crystal composite film 1 is sandwiched between a pair of transparent base materials 3 and 3 having transparent electrodes 2 and 2 formed on one surface. The liquid crystal element L is laminated and integrated with the mirror body M via the adhesive layer 4.
【0024】高分子/液晶複合膜1としては、前述し
た、マトリックス高分子と液晶材料とからなる複合膜が
使用される。マトリックス高分子としては、透明なもの
であれば種々の高分子材料が使用可能であり、例えばポ
リアクリル酸エステル、ポリメタクリル酸エステル等の
アクリル樹脂、ポリジイソプロピルフマレート等のフマ
レート系樹脂、ジアリルフタレート樹脂等があげられ、
これらの中から、前述した条件を満足する屈折率を有す
るものが、適宜選択して使用される。As the polymer / liquid crystal composite film 1, the above-mentioned composite film composed of a matrix polymer and a liquid crystal material is used. As the matrix polymer, various polymer materials can be used as long as they are transparent. For example, acrylic resins such as polyacrylic acid ester and polymethacrylic acid ester, fumarate-based resins such as polydiisopropyl fumarate, and diallyl phthalate. Resin, etc.
Among these, those having a refractive index satisfying the above-mentioned conditions are appropriately selected and used.
【0025】また、液晶材料としては、通常の液晶表示
素子に用いられるネマティック液晶等が好適に使用さ
れ、その中から、前述した条件を満足する屈折率を有す
るものが、適宜選択して使用される。なお、このネマテ
ィック液晶としては、特に限定されないが、誘電率異方
性Δεの大きいものを使用するのが、良好な特性を得る
上で好ましい。As the liquid crystal material, nematic liquid crystal or the like used in ordinary liquid crystal display elements is preferably used, and among them, those having a refractive index satisfying the above-mentioned conditions are appropriately selected and used. It The nematic liquid crystal is not particularly limited, but it is preferable to use one having a large dielectric anisotropy Δε in order to obtain good characteristics.
【0026】なお、上記高分子/液晶複合膜1には、光
散乱状態での防眩効果をより効果的にするために、適宜
量の二色性色素を添加することもできる。また、上記高
分子/液晶複合膜1は、マトリックス高分子を含有する
ものゆえ、前述したように、スペーサ等を用いなくても
自己支持性を有するが、必要に応じて、ガラスビーズ、
樹脂粒子等のスペーサを配合することもできる。Incidentally, an appropriate amount of dichroic dye may be added to the polymer / liquid crystal composite film 1 in order to make the antiglare effect in the light scattering state more effective. Further, since the polymer / liquid crystal composite film 1 contains a matrix polymer, as described above, it has self-supporting property without using a spacer or the like, but if necessary, glass beads,
Spacers such as resin particles can also be blended.
【0027】透明基材3としては、例えば透明なプラス
チックフィルムやプラスチック板、ガラス板等があげら
れる。また、この透明基材3の表面に形成される透明電
極2としては、ITO(インジウム・チン・オキサイ
ド)膜等の、従来公知の種々の透明導電性材料からなる
薄膜を使用することができる。両透明電極2,2間に
は、電源5aとスイッチ5bとからなる駆動装置5が接
続される。この駆動装置5は、高分子/液晶複合膜1を
光散乱状態にするときに使用されるものであって、電源
5aとしては、直流電圧または交流電圧を発生し得るも
のが使用される。Examples of the transparent substrate 3 include transparent plastic films, plastic plates, glass plates and the like. As the transparent electrode 2 formed on the surface of the transparent base material 3, thin films made of various conventionally known transparent conductive materials such as ITO (indium tin oxide) film can be used. A drive device 5 including a power source 5a and a switch 5b is connected between the transparent electrodes 2 and 2. The driving device 5 is used when the polymer / liquid crystal composite film 1 is brought into a light-scattering state, and as the power source 5a, a device that can generate a DC voltage or an AC voltage is used.
【0028】上記高分子/液晶複合膜1、透明電極2、
および、透明基材3からなる液晶素子Lは、マトリック
ス高分子と液晶材料とを適当な溶剤中に溶解した溶液
を、一方の透明基材3の表面に流延塗布し、乾燥させて
高分子/液晶複合膜1を形成したのち、この高分子/液
晶複合膜上に他方の透明基材3を重ね合わせることで製
造される。The polymer / liquid crystal composite film 1, the transparent electrode 2,
The liquid crystal element L composed of the transparent base material 3 is formed by casting a solution of a matrix polymer and a liquid crystal material dissolved in a suitable solvent on the surface of one transparent base material 3 and drying it to form a polymer. / Liquid crystal composite film 1 is formed, and then the other transparent substrate 3 is laminated on the polymer / liquid crystal composite film.
【0029】鏡体Mとしては、ガラス板等の透明基材M
1の裏面に光反射膜(図示せず)が形成された、通常の
鏡が使用される。液晶素子Lと鏡体Mとを接着する接着
層4としては、上記両者の接着に適し、しかも、硬化ま
たは固化した際に透明になって光の透過を妨げない接着
剤が使用される。As the mirror M, a transparent substrate M such as a glass plate is used.
An ordinary mirror having a light reflecting film (not shown) formed on the back surface of the No. 1 is used. As the adhesive layer 4 for adhering the liquid crystal element L and the mirror body M, an adhesive which is suitable for adhering the both and is transparent when cured or solidified so as not to prevent light transmission is used.
【0030】上記構成の液晶防眩ミラーは、鏡体Mとし
て通常の鏡を使用し、その表面に、液晶素子Lを接着剤
によって接着するだけで製造できるので、製造が容易に
なるという利点がある。つぎに、図2に示す他の実施例
の液晶防眩ミラーについて説明する。図にみるように、
この実施例の液晶防眩ミラーは、片面に透明電極2が形
成された透明基材3と、表面に金属電極6が形成された
鏡体Mとによって、高分子/液晶複合膜1を挟着するこ
とで、鏡体Mと一体化された液晶素子Lを構成したもの
である。また、上記金属電極6は、鏡体Mの光反射膜を
兼ねている。The liquid crystal anti-glare mirror having the above-described structure can be manufactured by using a normal mirror as the mirror body M and simply bonding the liquid crystal element L to the surface of the mirror M with an adhesive, which is advantageous in that the manufacturing is easy. is there. Next, a liquid crystal anti-glare mirror of another embodiment shown in FIG. 2 will be described. As shown in the figure,
In the liquid crystal antiglare mirror of this embodiment, the polymer / liquid crystal composite film 1 is sandwiched by a transparent substrate 3 having a transparent electrode 2 formed on one surface and a mirror body M having a metal electrode 6 formed on the surface thereof. By doing so, the liquid crystal element L integrated with the mirror body M is configured. The metal electrode 6 also serves as a light reflecting film of the mirror body M.
【0031】上記の構成によれば、金属電極6と鏡体M
とが、高分子/液晶複合膜1を挟着する一方の電極およ
び基材を兼ねているとともに、金属電極6が鏡体Mの光
反射膜を兼ねているので、全体の層数を減少でき、液晶
防眩ミラーの構成を簡略化できるという利点がある。な
お、上記両実施例では、高分子/液晶複合膜1が単層で
あったが、コントラストを上げるため複数層を積層して
用いてもよい。According to the above construction, the metal electrode 6 and the mirror M
Serves as one of the electrodes sandwiching the polymer / liquid crystal composite film 1 and the base material, and the metal electrode 6 serves as the light reflecting film of the mirror body M, so that the total number of layers can be reduced. The advantage is that the structure of the liquid crystal antiglare mirror can be simplified. Although the polymer / liquid crystal composite film 1 is a single layer in both of the above-mentioned examples, a plurality of layers may be laminated to increase the contrast.
【0032】図2の実施例では、鏡体Mとして、その表
面に、光反射膜を兼ねる金属電極6が設けられたものを
使用していたが、鏡体としては、裏面に光反射膜が形成
された通常の鏡の表面に、透明電極を形成したものを使
用することもできる。その他、層構成や形状等について
は、本発明の要旨を変更しない範囲で、種々の設計変更
を施すことができる。In the embodiment shown in FIG. 2, the mirror M is provided with the metal electrode 6 also serving as a light reflection film on the surface thereof, but the mirror M has a light reflection film on the back surface. A transparent electrode may be formed on the surface of the formed ordinary mirror. In addition, various design changes can be made to the layer structure, the shape, and the like without departing from the scope of the invention.
【0033】次に具体的な例をあげてより詳細に説明す
る。 *具体例1 マトリックス高分子としてのジアリルフタレート樹脂
(ηP =1.5252、日本油脂社製)40重量部と、
液晶(Δη=0.1216、Next, a specific example will be described in more detail. * Specific Example 1 40 parts by weight of diallyl phthalate resin (η P = 1.5252, manufactured by NOF CORPORATION) as a matrix polymer,
Liquid crystal (Δη = 0.216,
【0034】[0034]
【外5】 [Outside 5]
【0035】=1.608、= 1.608,
【0036】[0036]
【外6】 [Outside 6]
【0037】=1.4867、メルクジャパン社製のM
J90217)60重量部とをジクロロメタンに溶解し
て、濃度20%の塗布液を得た。この塗布液を、表面に
透明電極としてのITO膜を設けた透明基材上にバーコ
ート法で塗布し、室温で30分間乾燥して高分子/液晶
複合膜を形成した後、この複合膜の表面に、光反射膜を
兼ねるCr電極を設けた鏡体を重ね合わせて、図2に示す
層構成の、液晶素子Lと鏡体Mとが一体化した液晶防眩
ミラーを作製した。 *具体例2 上記具体例1で作製した塗布液を、表面に透明電極とし
てのITO膜を設けた透明基材上にバーコート法で塗布
し、室温で30分間乾燥して高分子/液晶複合膜を形成
した後、この複合膜の表面に、もう1枚のITO膜付き
透明基材を重ね合わせて液晶素子を形成した。= 1.4867, M manufactured by Merck Japan Co., Ltd.
60902 parts by weight of J90217) was dissolved in dichloromethane to obtain a coating solution having a concentration of 20%. This coating solution was applied by a bar coating method on a transparent substrate having an ITO film as a transparent electrode on the surface and dried at room temperature for 30 minutes to form a polymer / liquid crystal composite film, and then the composite film A mirror body provided with a Cr electrode also serving as a light reflection film was superposed on the surface, and a liquid crystal anti-glare mirror having a layer structure shown in FIG. * Specific Example 2 The coating solution prepared in Specific Example 1 was applied by a bar coating method on a transparent substrate having an ITO film as a transparent electrode on its surface, and dried at room temperature for 30 minutes to form a polymer / liquid crystal composite. After forming the film, another transparent substrate with an ITO film was laminated on the surface of this composite film to form a liquid crystal element.
【0038】つぎに、上記液晶素子を、光学用接着剤
(応用光電研究室社製の商品名「レンズボンド」)を用
いて、裏面に光反射膜を有する鏡体の表面に接着したの
ち、70℃×70分の熱処理を行って接着剤を硬化させ
て、図1に示す層構成の、液晶素子Lと鏡体Mとが接着
層4により積層一体化された液晶防眩ミラーを作製し
た。Next, the above liquid crystal element was adhered to the surface of the mirror body having the light reflection film on the back surface by using an optical adhesive (trade name "lens bond" manufactured by Applied Photonics Laboratory Co., Ltd.), A heat treatment was performed at 70 ° C. for 70 minutes to cure the adhesive, and a liquid crystal antiglare mirror having a layer structure shown in FIG. 1 in which the liquid crystal element L and the mirror body M were laminated and integrated by the adhesive layer 4 was produced. ..
【0039】上記具体例1,2で作製した液晶防眩ミラ
ーの両電極間に、図1または図2に示すように、電源5
aとスイッチ5bとからなる駆動装置5を接続して、交
流電圧(60V)を印加すると、何れのものも、約10
0msで液晶素子が光散乱状態になり、電圧の印加を停止
すると、約100msで液晶素子が光透過状態になった。As shown in FIG. 1 or FIG. 2, a power source 5 is provided between both electrodes of the liquid crystal antiglare mirror manufactured in the above-mentioned specific examples 1 and 2.
When the driving device 5 including the switch a and the switch 5b is connected and an AC voltage (60 V) is applied, each of them is about 10
The liquid crystal element became a light scattering state at 0 ms, and when the voltage application was stopped, the liquid crystal element became a light transmitting state at about 100 ms.
【0040】そこで、上記具体例1,2の液晶防眩ミラ
ーに、光源としてのHe−Neレーザー(波長633nm、発
射光径1mmφ)からの光を照射し、その反射光を光電管
で受光(受光径0.4mmφ)して、液晶防眩ミラーから
の反射光量を求め、照射光量と反射光量とから、液晶防
眩ミラーの光の反射率を算出した。結果を表1に示す。Therefore, the liquid crystal anti-glare mirrors of the above-mentioned specific examples 1 and 2 are irradiated with light from a He-Ne laser (wavelength 633 nm, emission light diameter 1 mmφ) as a light source, and the reflected light is received by a phototube (received light). The amount of light reflected from the liquid crystal anti-glare mirror was determined, and the light reflectance of the liquid crystal anti-glare mirror was calculated from the irradiation light amount and the reflected light amount. The results are shown in Table 1.
【0041】[0041]
【表1】 [Table 1]
【0042】上記表1の結果より、具体例1,2の液晶
防眩ミラーは、何れも、電圧印加時に防眩状態(光散乱
状態)、非印加時に非防眩状態(透明状態)となること
が判った。From the results in Table 1 above, the liquid crystal antiglare mirrors of Examples 1 and 2 are both in the antiglare state (light scattering state) when a voltage is applied and in the nonglare state (transparent state) when no voltage is applied. I knew that.
【0043】[0043]
【発明の効果】以上詳述したように、本発明の液晶防眩
ミラーは、電圧印加時に光散乱状態、非印加時に光透過
状態となる液晶素子を設けたものであるため、非防眩状
態において、印加電圧の変動や停止によってミラーが見
えにくくなるおそれがなく、信頼性が高い上、非防眩状
態での反射率が高く見えやすい。しかも、本発明の液晶
防眩ミラーは、日中に、非防眩状態(透明状態)で連続
使用される場合に電圧を印加する必要がなく、消費電力
等の点で経済的に優れている。本発明の液晶防眩ミラー
は、特にバックミラー等の車載用ミラーに好適に使用す
ることができる。As described in detail above, the liquid crystal antiglare mirror of the present invention is provided with a liquid crystal element that is in a light scattering state when a voltage is applied and in a light transmitting state when a voltage is not applied. In the above, there is no fear that the mirror becomes difficult to see due to fluctuations or stoppage of the applied voltage, the reliability is high, and the reflectance in the non-glare state is high and easy to see. Moreover, the liquid crystal antiglare mirror of the present invention does not need to be applied with a voltage during continuous use in a non-antiglare state (transparent state) during the day, and is economically excellent in terms of power consumption and the like. .. The liquid crystal antiglare mirror of the present invention can be suitably used particularly for vehicle-mounted mirrors such as rearview mirrors.
【図1】本発明の液晶防眩ミラーの、一実施例を示す断
面図である。FIG. 1 is a sectional view showing an embodiment of a liquid crystal antiglare mirror of the present invention.
【図2】本発明の液晶防眩ミラーの、他の実施例を示す
断面図である。FIG. 2 is a sectional view showing another embodiment of the liquid crystal antiglare mirror of the present invention.
L 液晶素子 M 鏡体 1 高分子/液晶複合膜 2 透明電極 3 透明基材 6 金属電極 L liquid crystal element M mirror body 1 polymer / liquid crystal composite film 2 transparent electrode 3 transparent substrate 6 metal electrode
Claims (3)
過状態となる液晶素子を鏡体表面の少なくとも一部に設
けたことを特徴とする液晶防眩ミラー。1. A liquid crystal antiglare mirror comprising a liquid crystal element that is in a light scattering state when a voltage is applied and is in a light transmitting state when a voltage is not applied, on at least a part of the mirror surface.
からなる複合膜を、透明電極を有する一対の透明基材で
挟着して構成されている請求項1記載の液晶防眩ミラ
ー。2. A liquid crystal antiglare mirror according to claim 1, wherein the liquid crystal element is constituted by sandwiching a composite film composed of a matrix polymer and liquid crystal between a pair of transparent base materials having transparent electrodes.
からなる複合膜を、光反射膜を兼ねる金属電極を有する
鏡体と、透明電極を有する透明基材とで挟着して構成さ
れている請求項1記載の液晶防眩ミラー。3. A liquid crystal device comprising a composite film composed of a matrix polymer and liquid crystal sandwiched between a mirror body having a metal electrode also serving as a light reflecting film and a transparent substrate having a transparent electrode. The liquid crystal antiglare mirror according to claim 1.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3251997A JPH0588144A (en) | 1991-09-30 | 1991-09-30 | Liquid crystal antidazzle mirror |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3251997A JPH0588144A (en) | 1991-09-30 | 1991-09-30 | Liquid crystal antidazzle mirror |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0588144A true JPH0588144A (en) | 1993-04-09 |
Family
ID=17231119
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3251997A Pending JPH0588144A (en) | 1991-09-30 | 1991-09-30 | Liquid crystal antidazzle mirror |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0588144A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6402496B2 (en) | 1998-12-14 | 2002-06-11 | Timecaps Inc. | Gelatin capsule manufacturing apparatus |
JP2013228646A (en) * | 2012-04-27 | 2013-11-07 | Hitachi Chemical Co Ltd | Lighting control device |
JP2017065388A (en) * | 2015-09-29 | 2017-04-06 | アルパイン株式会社 | Electronic mirror device, display control program and display control method |
-
1991
- 1991-09-30 JP JP3251997A patent/JPH0588144A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6402496B2 (en) | 1998-12-14 | 2002-06-11 | Timecaps Inc. | Gelatin capsule manufacturing apparatus |
JP2013228646A (en) * | 2012-04-27 | 2013-11-07 | Hitachi Chemical Co Ltd | Lighting control device |
JP2017065388A (en) * | 2015-09-29 | 2017-04-06 | アルパイン株式会社 | Electronic mirror device, display control program and display control method |
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