JP6432218B2 - Camera with polarizing plate, surveillance camera, and polarizing plate - Google Patents

Camera with polarizing plate, surveillance camera, and polarizing plate Download PDF

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JP6432218B2
JP6432218B2 JP2014175452A JP2014175452A JP6432218B2 JP 6432218 B2 JP6432218 B2 JP 6432218B2 JP 2014175452 A JP2014175452 A JP 2014175452A JP 2014175452 A JP2014175452 A JP 2014175452A JP 6432218 B2 JP6432218 B2 JP 6432218B2
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polarizing plate
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transmittance
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polarizing
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JP2015179240A (en
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勝洋 山本
勝洋 山本
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Sumitomo Bakelite Co Ltd
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Description

本発明は、偏光板付きカメラ、監視カメラ、および偏光板に関するものである。   The present invention relates to a camera with a polarizing plate, a surveillance camera, and a polarizing plate.

カメラで撮影する際に光の反射を低減させるために、偏光板は利用されている。通常、例えばフロントガラスや水面などから反射される光は、一方向の振幅の光となっているため、その振幅方向に偏光板の吸収軸を合わせることで反射光を吸収させ、反射光による映り込みを防ぐことが可能となる。この偏光板として多く用いられているものは、ポリビニルアルコール膜をヨウ素にて染色、延伸を行った偏光膜の両面をトリアセチルセルロース(TAC)でラミネートされたTAC偏光板が用いられている。(例えば、特許文献1参照。)
暗所での撮影に対応できるように赤外線を受光できるカメラが、監視カメラや家庭用カメラとして普及している。しかし、前記ヨウ素を用いた偏光板では、可視光による撮影で反射を抑える目的で通常の偏光板を設置すると赤外線の透過率が低下し、暗所での赤外線撮影時に画像が暗くなり撮影できない課題があった。
A polarizing plate is used to reduce reflection of light when photographing with a camera. Normally, light reflected from, for example, a windshield or water surface is light having an amplitude in one direction. Therefore, the reflected light is absorbed by matching the absorption axis of the polarizing plate in the amplitude direction, and reflected by the reflected light. It is possible to prevent the jamming. As this polarizing plate, a TAC polarizing plate in which a polyvinyl alcohol film is dyed with iodine and both surfaces of a polarizing film subjected to stretching are laminated with triacetyl cellulose (TAC) is used. (For example, refer to Patent Document 1.)
Cameras that can receive infrared light so that they can be used in dark places are widely used as surveillance cameras and home cameras. However, with the polarizing plate using iodine, when an ordinary polarizing plate is installed for the purpose of suppressing reflection by photographing with visible light, the infrared transmittance decreases, and the image becomes dark and cannot be photographed at the time of infrared photographing in a dark place. was there.

特開平09−061625号公報JP 09-061625 A

本発明の目的とするところは、可視光領域では反射を抑えた明瞭な画像を得ることができ、さらに、暗所における赤外線撮影において画像の暗化を抑えたカメラを提供することにある。   An object of the present invention is to provide a camera that can obtain a clear image in which reflection is suppressed in the visible light region, and further suppresses darkening of an image in infrared photographing in a dark place.

このような目的は、下記の[1]〜[7]に記載の本発明により達成される。
[1] 可視光での撮影と赤外光による暗所撮影とが可能であり、
カメラレンズより撮影対象物側に、波長550nmの光の透過率が20%以上60%以下でかつ、波長900nmの光の透過率が70%以上である、ポリビニルアルコールを二色性色素で染色し、ホウ素化合物で架橋することにより得られた偏光板を設置した偏光板付きカメラ。
[2] 可視光での撮影と赤外光による暗所撮影とが可能であり、
カメラレンズより撮影対象物側に、波長550nmの光の透過率が20%以上50%以下でかつ、波長900nmの光の透過率が70%以上である、ポリビニルアルコールを二色性色素で染色し、ホウ素化合物で架橋することにより得られた偏光板を設置した偏光板付きカメラ。
[3] 前記偏光板は、偏光膜の少なくとも片面に熱可塑性樹脂が形成された[1]または[2]に記載の偏光板付きカメラ。
[4] 前記偏光板は、カメラレンズの透光部を覆うカバーである[1]乃至[3]のいずれか1項に記載の偏光板付きカメラ。
[5] 前記偏光板は、カメラレンズを覆うドーム状カバーの一部である[1]乃至[4]のいずれか1項に記載の偏光板付きカメラ。
[6] [1]乃至[5]のいずれか1項に記載の偏光板付きカメラを用いた監視カメラ。
[7] 可視光での撮影と赤外光による暗所撮影とが可能である、[1]乃至[5]のいずれか1項に記載の偏光板付きカメラに用いられ、波長550nmの光の透過率が20%以上60%以下でかつ、波長900nmの光の透過率が70%以上である、ポリビニルアルコールを二色性色素で染色し、ホウ素化合物で架橋することにより得られた偏光板。
Such an object is achieved by the present invention described in the following [1] to [7].
[1] Capable of shooting with visible light and shooting in the dark with infrared light,
The polyvinyl alcohol having a light transmittance of 20% or more and 60% or less and a light transmittance of 900 nm or more is dyed with a dichroic dye on the side of the object to be photographed from the camera lens. A camera with a polarizing plate provided with a polarizing plate obtained by crosslinking with a boron compound .
[2] Capable of shooting with visible light and shooting in the dark with infrared light.
The polyvinyl alcohol having a light transmittance of 20% to 50% at a wavelength of 550 nm and a light transmittance of 70% or more at a wavelength of 900 nm is dyed with a dichroic dye on the side of the object to be photographed from the camera lens. A camera with a polarizing plate provided with a polarizing plate obtained by crosslinking with a boron compound .
[3] The camera with a polarizing plate according to [1] or [2], wherein the polarizing plate has a thermoplastic resin formed on at least one surface of the polarizing film.
[4] The camera with a polarizing plate according to any one of [1] to [3], wherein the polarizing plate is a cover that covers a light transmitting portion of the camera lens.
[5] The camera with a polarizing plate according to any one of [1] to [4], wherein the polarizing plate is a part of a dome-shaped cover that covers the camera lens.
[6] A surveillance camera using the camera with a polarizing plate according to any one of [1] to [5].
[7] Capable of photographing with visible light and photographing in a dark place with infrared light. [1] Used in the camera with a polarizing plate according to any one of [1] to [5], and having a wavelength of 550 nm. A polarizing plate obtained by dyeing polyvinyl alcohol having a transmittance of 20% or more and 60% or less and a transmittance of light having a wavelength of 900 nm of 70% or more with a dichroic dye and crosslinking with a boron compound .

本発明によれば、可視光領域では反射を抑えた明瞭な画像を得ることができ、暗所における赤外線撮影において画像の暗化を抑えたカメラを提供することができる。   According to the present invention, a clear image in which reflection is suppressed in the visible light region can be obtained, and a camera in which image darkening is suppressed in infrared imaging in a dark place can be provided.

本発明の実施形態における偏光板の設置箇所とレンズ、撮影対象物との関係 を示した構成図である。FIG. 5 is a configuration diagram showing the relationship between the installation location of a polarizing plate, a lens, and an object to be photographed in an embodiment of the present invention. 本発明に用いられる偏光板の構成を示す断面図である。It is sectional drawing which shows the structure of the polarizing plate used for this invention. 本発明を用いて撮影される撮影例を示す図である。It is a figure which shows the example of imaging | photography image | photographed using this invention.

本発明は、カメラレンズより撮影対象物側に偏光板を設置した偏光板付きカメラで、前記偏光板は波長550nmの光の透過率が20%以上60%以下でかつ、波長900nmの光の透過率が70%以上100%未満である偏光板付きカメラである。このような構成とすることで可視光領域では反射を抑えた明瞭な画像を得ることができ、暗所における赤外線撮影において画像の暗化を抑えることが可能になる。   The present invention is a camera with a polarizing plate in which a polarizing plate is disposed closer to the object to be photographed than the camera lens. The polarizing plate has a light transmittance of 20% to 60% and a light of 900 nm. It is a camera with a polarizing plate whose rate is 70% or more and less than 100%. With such a configuration, it is possible to obtain a clear image in which reflection is suppressed in the visible light region, and it is possible to suppress darkening of the image in infrared imaging in a dark place.

本発明に用いられるカメラは、可視光での撮影と赤外光による暗所撮影ができれば特に制限はなく、市販のものを用いてよい。カメラとしてはパナソニック製DG−SP509やソニー製SNC−DH220などがあげられる。記録の観点からカメラはLAN(Local Area Network)等のネットワークに接続されているカメラが好ましい。   The camera used in the present invention is not particularly limited as long as it can shoot with visible light and shoot in a dark place with infrared light, and a commercially available camera may be used. Examples of the camera include Panasonic DG-SP509 and Sony SNC-DH220. From the viewpoint of recording, the camera is preferably a camera connected to a network such as a LAN (Local Area Network).

本発明に用いられる偏光板は、波長550nmの光の透過率が20%以上60%以下でかつ、波長900nmの光の透過率が70%以上100%未満であれば特に制限はなく、例えば、ポリビニルアルコールを二色性色素で染色し、ホウ素化合物などで架橋することによって得た偏光膜などが用いられる。好ましくは、偏光板が、波長550nmの光の透過率が20%以上55%以下のものであり、さらに好ましくは、波長550nmの光の透過率が20%以上50%以下のものである。このような範囲とすることで、昼間の視認性、すなわち、可視光領域では反射を抑えた明瞭な画像を得ることできる効果を奏する。
さらに、波長900nmの光の透過率が、70%以上であり、よりに好ましくは75%以上で、さらに好ましくは80%以上である。このような範囲にすることで、夜間の視認性、すなわち、暗所における赤外線撮影の画像認識性に優れる効果を奏する。
The polarizing plate used in the present invention is not particularly limited as long as the transmittance of light having a wavelength of 550 nm is 20% or more and 60% or less and the transmittance of light having a wavelength of 900 nm is 70% or more and less than 100%. A polarizing film or the like obtained by dyeing polyvinyl alcohol with a dichroic dye and crosslinking with a boron compound or the like is used. Preferably, the polarizing plate has a light transmittance of 20% to 55% at a wavelength of 550 nm, and more preferably has a light transmittance of 20% to 50% at a wavelength of 550 nm. By setting it as such a range, there exists an effect which can obtain the clear image which suppressed the reflection in daytime visibility, ie, a visible light area | region.
Furthermore, the transmittance of light having a wavelength of 900 nm is 70% or more, more preferably 75% or more, and further preferably 80% or more. By setting it as such a range, there exists an effect which is excellent in nighttime visibility, ie, the image recognition property of the infrared imaging in the dark place.

偏光板の透過率は、日本分光製分光透過率計V−670を用いて550nmと900nmの透過率を測定することで求めることができる。   The transmittance of the polarizing plate can be determined by measuring the transmittance at 550 nm and 900 nm using a spectral transmittance meter V-670 manufactured by JASCO Corporation.

本発明に用いられる偏光板は、前記偏光膜の少なくとも片面に熱可塑性樹脂が形成されたものであることが好ましい。前記偏光膜の片面または両面の熱可塑性樹脂が形成されるものである。このような構成とすることで、強度が向上し、取り扱いが容易に、形状安定性にも優れるものとなる。
本発明に用いられる偏光膜の少なくとも片面に形成される熱可塑性樹脂は、光が透過すれば特に制限はなく、例えば、ポリカーボネート、トリアセチルセルロース等を用いることができる。このような構成とすることで、落下や衝撃から前記偏光膜を保護することができ、耐衝撃性の観点から熱可塑性樹脂がポリカーボネートを用いることが最も好ましい。
The polarizing plate used in the present invention is preferably one in which a thermoplastic resin is formed on at least one surface of the polarizing film. A thermoplastic resin on one or both sides of the polarizing film is formed. With such a configuration, the strength is improved, the handling is easy, and the shape stability is also excellent.
The thermoplastic resin formed on at least one surface of the polarizing film used in the present invention is not particularly limited as long as it transmits light. For example, polycarbonate, triacetyl cellulose, or the like can be used. By setting it as such a structure, it can protect the said polarizing film from a fall and an impact, and it is most preferable to use a polycarbonate as a thermoplastic resin from a viewpoint of impact resistance.

本発明に用いられる偏光板の偏光膜は、ヨウ素を含まず、二色性染料によって偏光機能持たせることが好ましい。ヨウ素によって偏光性能を持たせた場合、屋外で使用すると経時変化により退色し、十分な偏光性能を長期間にわたって保持できない。二色性染料であれば特にその種類に制限を受けることはない。具体的は、ブリリアントブルー6B、ソロ
フェニルブルーFGLE220%、ソロフェニルブルーGL250%、カヤセロンブルーC−2R、ベンゾパープリン、クロラゾールブラックBH、ダイレクトペーパーブルー STL、Solarus Rubine BLN、TOA スカーレット 4BS、EVERPULP ORENGE 2G、ハマダイ ペーパー イエロー R 125%、ダイレクト ファースト オレンジ S コンク、ベンゾパープリン、Diacotton
Fast Orange WS、Direct Fast Orange S、AIZEN Primula Scarlet GSH、JAPANSOL FAST BLACK D conc.などが挙げられる。
The polarizing film of the polarizing plate used in the present invention preferably does not contain iodine and has a polarizing function with a dichroic dye. When the polarizing performance is imparted with iodine, when it is used outdoors, it fades with time and cannot maintain sufficient polarizing performance over a long period of time. If it is a dichroic dye, there will be no restriction | limiting in particular in the kind. Specifically, Brilliant Blue 6B, Solophenyl Blue FGLE 220%, Solophenyl Blue GL 250%, Kayathelon Blue C-2R, Benzoperpurine, Chlorazole Black BH, Direct Paper Blue STL, Solarus Rubine BLN, TOA Scarlet 4BS, EVERPULP ORENGE 2G, Hamadai Paper Yellow R 125%, Direct First Orange S Conch, Benzoperpurin, Diacotton
Fast Orange WS, Direct Fast Orange S, AIZE PRIMURA SCARlet GSH, JAPANSOL FAST BLACK D conc. Etc.

本発明に用いられる偏光板は、カメラレンズの透光部の一部を覆う形状であれば、形状、成形方法、加工方法について制限はない。前記偏光板のカメラへの設置は、カメラの周囲にフレームを用いてもよく、また直接粘着剤等を用いてカメラに貼りつけてもよい。
また、前記偏光板は、成形加工、打抜き加工、切削加工により、カメラに設置し易い形状に加工することも可能である。加工性の観点から打抜き加工を行うことが好ましい。
本発明に用いられる偏光板は、作業性、外観の観点から総厚み0.5mm以上の偏光板を熱成型によって成形する方法が好ましい。
カメラの形状により、カメラレンズを覆うドーム状カバーであっても構わない。成形加工により、上記偏光板をドーム状に成形することが可能である。ドーム状とは、半球の形状であれば曲率半径に制限はない。このような形状にすることで、カメラを全周にわたって保護可能である。
上記の構成とした偏光板付きカメラにおいては、可視光領域では反射を抑えた明瞭な画像を得ることができ、暗所における赤外線撮影において画像の暗化を抑えることができる。
特に好ましくは、監視カメラに用いることが可能である。監視カメラは、屋外であっても、屋内であっても設置可能である。
If the polarizing plate used for this invention is a shape which covers a part of translucent part of a camera lens, there will be no restriction | limiting about a shape, a shaping | molding method, and a processing method. The polarizing plate may be installed on the camera by using a frame around the camera or by directly attaching the polarizing plate to the camera using an adhesive or the like.
The polarizing plate can be processed into a shape that can be easily installed in a camera by molding, punching, or cutting. Punching is preferably performed from the viewpoint of workability.
The polarizing plate used in the present invention is preferably a method of forming a polarizing plate having a total thickness of 0.5 mm or more by thermoforming from the viewpoint of workability and appearance.
Depending on the shape of the camera, it may be a dome-shaped cover that covers the camera lens. The polarizing plate can be formed into a dome shape by molding. As long as the dome shape is a hemispherical shape, the radius of curvature is not limited. By adopting such a shape, the camera can be protected over the entire circumference.
In the camera with a polarizing plate configured as described above, a clear image in which reflection is suppressed in the visible light region can be obtained, and darkening of the image can be suppressed in infrared imaging in a dark place.
Particularly preferably, it can be used for a surveillance camera. The surveillance camera can be installed outdoors or indoors.

以下、図1から図3を用いて本発明の実施形態について説明する。
図1は、本発明の実施形態であるレンズと撮影対象物に対する偏光板の設置位置について示した図である。図2は、偏光板の構成を示す断面図である。図3は、本発明を用いて撮影される撮影例を示す図である
図1において、偏光板1は、波長550nmの光の透過率が20%以上60%以下でかつ、波長900nmの光の透過率が70%以上である。カメラには、レンズ2が設置されており、図中では1枚で記載しているが、実際は複数のレンズを使用した組み合わせレンズである。偏光板1は、レンズ2よりも撮影対象物3の方向に配置することで構成されている。
図2において、偏光板1は、偏光機能を持つ偏光膜4と熱可塑性樹脂5、6を有し、偏光膜4を熱可塑性樹脂5と熱可塑性樹脂6とでラミネートされている。
Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 is a diagram showing the installation position of a polarizing plate with respect to a lens and an object to be photographed according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the configuration of the polarizing plate. FIG. 3 is a diagram showing a photographing example photographed using the present invention. In FIG. 1, the polarizing plate 1 has a light transmittance of 20% or more and 60% or less and a wavelength of 900 nm. The transmittance is 70% or more. The camera is provided with a lens 2, which is described as a single lens in the figure, but is actually a combined lens using a plurality of lenses. The polarizing plate 1 is configured by being arranged in the direction of the photographing object 3 rather than the lens 2.
In FIG. 2, the polarizing plate 1 includes a polarizing film 4 having a polarizing function and thermoplastic resins 5 and 6, and the polarizing film 4 is laminated with the thermoplastic resin 5 and the thermoplastic resin 6.

図3は、撮影に用いられるカメラ本体7を示す。偏光板1は、波長550nmの光の透過率が20%以上60%以下でかつ、波長900nmの光の透過率が70%以上である偏光板である。レンズ2は、カメラに設置されており、図中では1枚で記載しているが、実際は複数のレンズを使用した組み合わせレンズである。窓8は、撮影対象物3とカメラ本体7との間にある。
図3の窓8は、例えば、車のフロントガラスのようなものである。撮影対象物3を撮影する際、窓8によって反射する光は偏光板1によって吸収されるため、窓8での映り込みが低減され、撮影対象物3を鮮明に映すことが可能となる。
また、図3において、偏光板1は、波長900nmの透過率が70%以上あるため近赤外領域の光が透過率し、暗所で赤外光の撮影を行う際も画像の暗化を防ぐことができる。
FIG. 3 shows a camera body 7 used for photographing. The polarizing plate 1 is a polarizing plate having a light transmittance of 20% to 60% and a light transmittance of 70% or more at a wavelength of 900 nm. Although the lens 2 is installed in the camera and is described as a single lens in the drawing, it is actually a combination lens using a plurality of lenses. The window 8 is between the photographing object 3 and the camera body 7.
The window 8 in FIG. 3 is like a windshield of a car, for example. When photographing the object 3, the light reflected by the window 8 is absorbed by the polarizing plate 1, so that reflection on the window 8 is reduced and the object 3 can be clearly reflected.
Further, in FIG. 3, the polarizing plate 1 has a transmittance of at least 900% at a wavelength of 900 nm, so that light in the near infrared region is transmitted, and darkens the image even when photographing infrared light in a dark place. Can be prevented.

以下、実施例を用いて、本発明を説明するが、これらに限定されるものではない。
<実施例1>
(偏光板の作製)
膨潤槽、染色槽、架橋槽、乾燥機、を具備する染色装置にてポリビニルアルコールを主成分とするフィルム(商品名:「クラレビニロン#7500」、クラレ社製)を延伸させながら2色性染料を溶解させた水溶液(ブリリアントブルー6Bの濃度が4g/l、ベンゾパープリンの濃度が2g/l、JAPANSOL FAST BLACK D conc.の濃度が1g/l)中において40℃条件で10分間染色し、硼酸架橋し、偏光膜を作製した。
得られた上記偏光膜の両面に一液型湿気硬化型ポリウレタン系接着剤を介して、熱可塑性樹脂のポリカーボネート樹脂シートを圧着して総厚0.8mmの偏光板を作製した。
得られた偏光板を用いて、日本分光製分光透過率計V−670にて550nmと900nmの透過率を測定したところ、550nmの透過率は22%、900nmの透過率は85%であった。
(評価)
<屋外撮影評価>
式会社アルコム製屋外防雨型赤外線カメラRD−3911を使用し、表面のレンズに得られた偏光板をカメラレンズより撮影対象物側に設置し、屋外で13時〜15時(日中、太陽が出ている間)の間で車のフロントガラス越しに車内を撮影した。以下の基準で評価をおこなった。
○:車内のドライバーが認識できる
×:車内のドライバー、車内の様子が反射により認識できない
<赤外撮影評価>
株式会社アルコム製屋外防雨型赤外線カメラRD−3911を使用し、表面のレンズに得られた偏光板をカメラレンズより撮影対象物側に設置し、暗室内で赤外光による撮影を実施し、以下の基準で評価した。
○:画像が認識できるレベルの明度を維持している。
×:明度が低く、画像が認識できない。
EXAMPLES Hereinafter, although this invention is demonstrated using an Example, it is not limited to these.
<Example 1>
(Preparation of polarizing plate)
A dichroic dye while stretching a film mainly composed of polyvinyl alcohol (trade name: “Kuraray Vinylon # 7500”, manufactured by Kuraray Co., Ltd.) in a dyeing apparatus comprising a swelling tank, a dyeing tank, a crosslinking tank, and a dryer. In aqueous solution (brilliant blue 6B concentration of 4 g / l, benzoperpurine concentration of 2 g / l, JAPANSOL FAST BLACK D conc. Concentration of 1 g / l) at 40 ° C. for 10 minutes, and boric acid Crosslinking was performed to prepare a polarizing film.
A polycarbonate resin sheet of a thermoplastic resin was pressure-bonded to both surfaces of the obtained polarizing film via a one-component moisture-curable polyurethane adhesive to produce a polarizing plate having a total thickness of 0.8 mm.
Using the obtained polarizing plate, the transmittance at 550 nm and 900 nm was measured with a spectral transmittance meter V-670 manufactured by JASCO Corporation. The transmittance at 550 nm was 22%, and the transmittance at 900 nm was 85%. .
(Evaluation)
<Outdoor shooting evaluation>
Using the outdoor rainproof infrared camera RD-3911 manufactured by Alcom Co., Ltd., the polarizing plate obtained on the lens on the surface is installed on the side of the object to be photographed from the camera lens, and 13:00 to 15:00 outdoors (daytime, sun The inside of the car was photographed through the windshield of the car. Evaluation was performed according to the following criteria.
○: Recognized by the driver in the car ×: Driver in the car, state of the car cannot be recognized by reflection <Infrared photography evaluation>
Using the outdoor rainproof infrared camera RD-3911 manufactured by Alcom Co., Ltd., the polarizing plate obtained on the surface lens is installed on the side of the object to be photographed from the camera lens, and photographing with infrared light is carried out in the dark room, Evaluation was made according to the following criteria.
○: The brightness level at which an image can be recognized is maintained.
X: The brightness is low and the image cannot be recognized.

<実施例2>
膨潤槽、染色槽、架橋槽、乾燥機、を具備する染色装置にてポリビニルアルコールを主成分とするフィルム(商品名:「クラレビニロン#7500」、クラレ社製)を延伸させながら二色性染料を溶解させた水溶液(ブリリアントブルー6Bの濃度が3g/l、ベンゾパープリンの濃度が1.5g/l、JAPANSOL FAST BLACK D conc.の濃度が0.8g/l)中において40℃条件で10分間染色し、硼酸架橋し、偏光膜を作製した。
得られた偏光膜の両面に一液型湿気硬化型ポリウレタン系接着剤を介して、熱可塑性樹脂のポリカーボネート樹脂シートを圧着して総厚0.8mmの偏光板を作製した。
得られた偏光板を用いて、日本分光製分光透過率計V−670にて550nmと900nmの透過率を測定したところ、550nmの透過率は33%、900nmの透過率は89%であった。実施例1と同様に評価した。
<実施例3>
膨潤槽、染色槽、架橋槽、乾燥機、を具備する染色装置にてポリビニルアルコールを主成分とするフィルム(商品名:「クラレビニロン#7500」、クラレ社製)を延伸させながら二色性染料を溶解させた水溶液(ブリリアントブルー6Bの濃度が2g/l、ベンゾパープリンの濃度が1.2g/l、JAPANSOL FAST BLACK D conc.の濃度が0.5/lg)中において40℃条件で10分間染色し、硼酸架橋し、偏光膜を作製した。
得られた偏光膜の両面に一液型湿気硬化型ポリウレタン系接着剤を介して熱可塑性樹脂のポリカーボネート樹脂シートを圧着して総厚0.8mmの偏光板を作製した。
得られた偏光板を用いて、日本分光製分光透過率計V−670にて550nmと900nmの透過率を測定したところ、550nmの透過率は49%、900nmの透過率は89%であった。実施例1と同様に評価した。
<実施例4>
膨潤槽、染色槽、架橋槽、乾燥機、を具備する染色装置にてポリビニルアルコールを主成分とするフィルム(商品名:「クラレビニロン#7500」、クラレ社製)を延伸させながら二色性染料を溶解させた水溶液(ブリリアントブルー6Bの濃度が1g/l、ベンゾパープリンの濃度が0.8g/l、JAPANSOL FAST BLACK D conc.の濃度が0.3g/l)中において40℃条件で10分間染色し、にて染色、硼酸架橋し、偏光膜を作製した。
得られた偏光膜の両面に一液型湿気硬化型ポリウレタン系接着剤を介して熱可塑性樹脂のポリカーボネート樹脂シートを圧着して総厚0.8mmの偏光板を作製した。
得られた偏光板を用いて、日本分光製分光透過率計V−670にて550nmと900nmの透過率を測定したところ、550nmの透過率は56%、900nmの透過率は90%であった。実施例1と同様に評価した。
<実施例5>
実施例1で得られた偏光板を熱成形し、曲率半径100mmのドーム状カバーの一部を偏光板にて作製した。この偏光板を用いて、実施例1と同様の評価を実施した。
測定結果は、<屋外撮影評価>、<赤外撮影評価>いずれも「○」であった。
<Example 2>
A dichroic dye while stretching a film mainly composed of polyvinyl alcohol (trade name: “Kuraray Vinylon # 7500”, manufactured by Kuraray Co., Ltd.) in a dyeing apparatus comprising a swelling tank, a dyeing tank, a crosslinking tank, and a dryer. For 10 minutes at 40 ° C. in an aqueous solution in which the concentration of Brilliant Blue 6B is 3 g / l, the concentration of benzoperpurine is 1.5 g / l, and the concentration of JAPANFAST BLACK D conc. Is 0.8 g / l. It was dyed and cross-linked with boric acid to produce a polarizing film.
A polarizing plate having a total thickness of 0.8 mm was prepared by pressure-bonding a polycarbonate resin sheet of a thermoplastic resin to both surfaces of the obtained polarizing film via a one-component moisture-curable polyurethane adhesive.
Using the obtained polarizing plate, the transmittance at 550 nm and 900 nm was measured with a spectral transmittance meter V-670 manufactured by JASCO Corporation. The transmittance at 550 nm was 33% and the transmittance at 900 nm was 89%. . Evaluation was performed in the same manner as in Example 1.
<Example 3>
A dichroic dye while stretching a film mainly composed of polyvinyl alcohol (trade name: “Kuraray Vinylon # 7500”, manufactured by Kuraray Co., Ltd.) in a dyeing apparatus comprising a swelling tank, a dyeing tank, a crosslinking tank, and a dryer. For 10 minutes at 40 ° C. in an aqueous solution in which the concentration of Brilliant Blue 6B is 2 g / l, the concentration of benzoperpurine is 1.2 g / l, and the concentration of JAPANSOL FAST BLACK D conc. It was dyed and cross-linked with boric acid to produce a polarizing film.
A polycarbonate resin sheet of a thermoplastic resin was pressure bonded to both surfaces of the obtained polarizing film via a one-component moisture-curable polyurethane adhesive to produce a polarizing plate having a total thickness of 0.8 mm.
Using the obtained polarizing plate, the transmittance at 550 nm and 900 nm was measured with a spectral transmittance meter V-670 manufactured by JASCO Corporation. The transmittance at 550 nm was 49%, and the transmittance at 900 nm was 89%. . Evaluation was performed in the same manner as in Example 1.
<Example 4>
A dichroic dye while stretching a film mainly composed of polyvinyl alcohol (trade name: “Kuraray Vinylon # 7500”, manufactured by Kuraray Co., Ltd.) in a dyeing apparatus comprising a swelling tank, a dyeing tank, a crosslinking tank, and a dryer. In an aqueous solution (brilliant blue 6B concentration of 1 g / l, benzoperpurine concentration of 0.8 g / l, JAPANSOL FAST BLACK D conc. Concentration of 0.3 g / l) at 40 ° C. for 10 minutes. The polarizing film was prepared by dyeing, dyeing with boric acid and crosslinking with boric acid.
A polycarbonate resin sheet of a thermoplastic resin was pressure bonded to both surfaces of the obtained polarizing film via a one-component moisture-curable polyurethane adhesive to produce a polarizing plate having a total thickness of 0.8 mm.
Using the obtained polarizing plate, the transmittance at 550 nm and 900 nm was measured with a spectral transmittance meter V-670 manufactured by JASCO Corporation. The transmittance at 550 nm was 56%, and the transmittance at 900 nm was 90%. . Evaluation was performed in the same manner as in Example 1.
<Example 5>
The polarizing plate obtained in Example 1 was thermoformed, and a part of a dome-shaped cover having a radius of curvature of 100 mm was produced with the polarizing plate. Evaluation similar to Example 1 was implemented using this polarizing plate.
The measurement results were “◯” for both <outdoor photographing evaluation> and <infrared photographing evaluation>.

<比較例1>
膨潤槽、染色槽、架橋槽、乾燥機、を具備する染色装置にてポリビニルアルコールを主成分とするフィルム(商品名:「クラレビニロン#7500」、クラレ社製)を延伸させながらヨウ素にて染色、硼酸架橋し、偏光膜を作製した。
得られた偏光膜の両面に一液型湿気硬化型ポリウレタン系接着剤を介して可塑性樹脂のポリカーボネート樹脂シートを圧着して総厚0.8mmの偏光板を作製した。
得られた偏光板にて日本分光製分光透過率計V−670を用いて550nmと900nmの透過率を測定したところ、550nmの透過率は20%、900nmの透過率は50%であった。実施例1と同様に評価した。赤外撮影評価では、明度が低く、画像が認識できない結果であった。
<比較例2>
膨潤槽、染色槽、架橋槽、乾燥機、を具備する染色装置にてポリビニルアルコールを主成分とするフィルム(商品名:「クラレビニロン#7500」、クラレ社製)を延伸させながらヨウ素にて染色、硼酸架橋し、偏光膜を作製した。
得られた偏光膜の両面に一液型湿気硬化型ポリウレタン系接着剤を介して可塑性樹脂のポリカーボネート樹脂シートを圧着して総厚0.8mmの偏光板を作製した。得られた偏光板を用いて日本分光製分光透過率計V−670にて550nmと900nmの透過率を測定したところ、550nmの透過率は65%、900nmの透過率は80%であった。実施例1と同様に評価した。屋外撮影評価では、車内のドライバー、車内の様子が反射により認識できない結果であった。
<Comparative Example 1>
Dyeing with iodine while stretching a film mainly composed of polyvinyl alcohol (trade name: “Kuraray Vinylon # 7500”, manufactured by Kuraray Co., Ltd.) in a dyeing apparatus comprising a swelling tank, a dyeing tank, a crosslinking tank, and a dryer. Then, it was crosslinked with boric acid to prepare a polarizing film.
A polarizing plate having a total thickness of 0.8 mm was produced by pressure-bonding a polycarbonate resin sheet of a plastic resin to both surfaces of the obtained polarizing film via a one-component moisture-curable polyurethane adhesive.
When the transmittance at 550 nm and 900 nm was measured using the spectral transmittance meter V-670 manufactured by JASCO Corporation, the transmittance at 550 nm was 20% and the transmittance at 900 nm was 50%. Evaluation was performed in the same manner as in Example 1. In the infrared imaging evaluation, the brightness was low and the image could not be recognized.
<Comparative Example 2>
Dyeing with iodine while stretching a film mainly composed of polyvinyl alcohol (trade name: “Kuraray Vinylon # 7500”, manufactured by Kuraray Co., Ltd.) in a dyeing apparatus comprising a swelling tank, a dyeing tank, a crosslinking tank, and a dryer. Then, it was crosslinked with boric acid to prepare a polarizing film.
A polarizing plate having a total thickness of 0.8 mm was produced by pressure-bonding a polycarbonate resin sheet of a plastic resin to both surfaces of the obtained polarizing film via a one-component moisture-curable polyurethane adhesive. When the transmittance at 550 nm and 900 nm was measured with a spectral transmittance meter V-670 manufactured by JASCO Corporation using the obtained polarizing plate, the transmittance at 550 nm was 65% and the transmittance at 900 nm was 80%. Evaluation was performed in the same manner as in Example 1. In outdoor shooting evaluation, the driver in the car and the state inside the car were not recognized by reflection.

1 偏光板
2 レンズ
3 撮影対象物
4 偏光膜
5 熱可塑性樹脂
6 熱可塑性樹脂
7 カメラ本体
8 窓(車のフロントガラス)
DESCRIPTION OF SYMBOLS 1 Polarizing plate 2 Lens 3 Shooting target object 4 Polarizing film 5 Thermoplastic resin 6 Thermoplastic resin 7 Camera body 8 Window (car windshield)

Claims (7)

可視光での撮影と赤外光による暗所撮影とが可能であり、
カメラレンズより撮影対象物側に、波長550nmの光の透過率が20%以上60%以下でかつ、波長900nmの光の透過率が70%以上である、ポリビニルアルコールを二色性色素で染色し、ホウ素化合物で架橋することにより得られた偏光板を設置した偏光板付きカメラ。
It is possible to shoot with visible light and dark place with infrared light,
The polyvinyl alcohol having a light transmittance of 20% or more and 60% or less and a light transmittance of 900 nm or more is dyed with a dichroic dye on the side of the object to be photographed from the camera lens. A camera with a polarizing plate provided with a polarizing plate obtained by crosslinking with a boron compound .
可視光での撮影と赤外光による暗所撮影とが可能であり、
カメラレンズより撮影対象物側に、波長550nmの光の透過率が20%以上50%以下でかつ、波長900nmの光の透過率が70%以上である、ポリビニルアルコールを二色性色素で染色し、ホウ素化合物で架橋することにより得られた偏光板を設置した偏光板付きカメラ。
It is possible to shoot with visible light and dark place with infrared light,
The polyvinyl alcohol having a light transmittance of 20% to 50% at a wavelength of 550 nm and a light transmittance of 70% or more at a wavelength of 900 nm is dyed with a dichroic dye on the side of the object to be photographed from the camera lens. A camera with a polarizing plate provided with a polarizing plate obtained by crosslinking with a boron compound .
前記偏光板は、偏光膜の少なくとも片面に熱可塑性樹脂が形成された請求項1または2に記載の偏光板付きカメラ。   The camera with a polarizing plate according to claim 1, wherein the polarizing plate has a thermoplastic resin formed on at least one surface of the polarizing film. 前記偏光板は、カメラレンズの透光部を覆うカバーである請求項1乃至3のいずれか1項に記載の偏光板付きカメラ。 The polarizing plate, a polarizing plate with a camera according to any one of claims 1 to 3 is a cover for covering the transparent portion of the camera lens. 前記偏光板は、カメラレンズを覆うドーム状カバーの一部である請求項1乃至4のいずれか1項に記載の偏光板付きカメラ。   The camera with a polarizing plate according to claim 1, wherein the polarizing plate is a part of a dome-shaped cover that covers the camera lens. 請求項1乃至5のいずれか1項に記載の偏光板付きカメラを用いた監視カメラ。   The surveillance camera using the camera with a polarizing plate of any one of Claims 1 thru | or 5. 可視光での撮影と赤外光による暗所撮影とが可能である、請求項1乃至5のいずれか1項に記載の偏光板付きカメラに用いられ、波長550nmの光の透過率が20%以上60%以下でかつ、波長900nmの光の透過率が70%以上である、ポリビニルアルコールを二色性色素で染色し、ホウ素化合物で架橋することにより得られた偏光板。 It is used for the camera with a polarizing plate according to any one of claims 1 to 5 , which is capable of photographing with visible light and photographing in a dark place with infrared light, and has a light transmittance of 20% at a wavelength of 550 nm. A polarizing plate obtained by dyeing polyvinyl alcohol with a dichroic dye and having a light transmittance of 70% or more at a wavelength of 900 nm or less and crosslinking with a boron compound .
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