JP2000314807A - Visible light shielding and infrared ray transmitting filter - Google Patents
Visible light shielding and infrared ray transmitting filterInfo
- Publication number
- JP2000314807A JP2000314807A JP11124050A JP12405099A JP2000314807A JP 2000314807 A JP2000314807 A JP 2000314807A JP 11124050 A JP11124050 A JP 11124050A JP 12405099 A JP12405099 A JP 12405099A JP 2000314807 A JP2000314807 A JP 2000314807A
- Authority
- JP
- Japan
- Prior art keywords
- visible light
- filter
- light source
- transmittance
- infrared
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、赤外線フィルター、特
に赤外線照射用光源に用いられる可視光の透過をほぼ完
全に遮断するフィルターに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared filter, and more particularly to a filter used as a light source for irradiating infrared rays, which almost completely blocks transmission of visible light.
【０００２】[0002]
【従来の技術】可視光を反射し、赤外線を透過する干渉
フィルターには、高屈折率透明誘電体と低屈折率透明誘
電体とを交互に積層したものと、可視光を反射する性質
を持つ金属や半導体と透明誘電体とを交互に積層したも
のとが知られている。このうち、可視光を反射する性質
を持つ金属や半導体と透明誘電体とを交互に積層した干
渉フィルターとして、シリコン（Ｓｉ）と二酸化珪素
（ＳｉＯ2）および／またはフッ化マグネシウム（Ｍｇ
Ｆ2）を使用したコールドミラーが知られている（特開
平６−１６７６０４号）。このコールドミラーはシリコ
ンの可視光を反射する性質を利用したもので、１６層以
下の積層によって４３０〜６７５ｎｍ範囲の可視光にお
いて８０％以上の反射率、８００〜２０００ｎｍ範囲の
赤外領域において２０％以下の反射率を得ている。2. Description of the Related Art An interference filter that reflects visible light and transmits infrared light has a high refractive index transparent dielectric and a low refractive index transparent dielectric laminated alternately, and has a property of reflecting visible light. It is known that a metal or a semiconductor and a transparent dielectric are alternately laminated. Among them, silicon (Si), silicon dioxide (SiO 2 ), and / or magnesium fluoride (Mg) are used as interference filters in which a metal or semiconductor having a property of reflecting visible light and a transparent dielectric are alternately laminated.
Cold mirror using F 2) has been known (Japanese Patent Laid-Open No. 6-167604). This cold mirror utilizes the property of silicon to reflect visible light, and has a reflectivity of 80% or more for visible light in the range of 430 to 675 nm and 20% in the infrared region of 800 to 2000 nm by laminating 16 layers or less. The following reflectance is obtained.
【０００３】上記のコールドミラーの反射率から見れ
ば、これをブラックライト用フィルターとして用いよう
とした場合、シリコン層の吸収を無視すれば、８００〜
２０００ｎｍ範囲の赤外領域において８０％以上の透過
率を持つとは云え、４３０〜６７５ｎｍ範囲の可視光に
おいて２０％以下の透過率を有することとなる。これを
ブラックライト用フィルターとして用いようとした場
合、フィルターを通して光源を見ると、光源が肉眼でい
わゆる透かして見える状態となり、可視光の透過率が高
過ぎて利用することができないものとなる。これは、干
渉膜を構成する各層の光学膜厚を１／４波長としたこと
により、設計的に限界が生じたものとも考えられるが、
使用目的から見て、このような構成で十分であったもの
と思われる。In view of the reflectance of the above-mentioned cold mirror, if it is intended to use it as a filter for black light, if the absorption of the silicon layer is neglected, it will be 800-800.
Although having a transmittance of 80% or more in the infrared region in the range of 2000 nm, it has a transmittance of 20% or less in the visible light in the range of 430 to 675 nm. If this is to be used as a filter for black light, when the light source is viewed through the filter, the light source will be visible to the naked eye, and the visible light transmittance is too high to be used. It is considered that this is because the optical thickness of each layer constituting the interference film is set to １ ／ wavelength, which has caused a limit in design.
From the point of view of use, it seems that such a configuration was sufficient.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、赤外線照射
光源（ブラックライト）として利用できる、赤外線透過
率が９００〜１５００ｎｍの範囲で平均８０％以上、可
視光線の透過率が４００〜８００ｎｍの範囲内で０．１
％以下のフィルターを得ようとするものである。SUMMARY OF THE INVENTION The present invention can be used as a light source for infrared irradiation (black light). The infrared transmittance in the range of 900 to 1500 nm is 80% or more on average, and the visible light transmittance is in the range of 400 to 800 nm. Within 0.1
% Of the filter is to be obtained.
【０００５】[0005]
【課題を解決するための手段】本発明の可視光線遮断赤
外線透過フィルターは、ガラス・石英・プラスチックな
どの基板の表裏面のうち、少なくとも一方の面に、半導
体物質からなる高屈折率層と、透明誘電体からなる低屈
折率層を交互に積層させ、多層膜干渉により、光源から
の可視光線を遮断し赤外線を透過するフィルターであっ
て、上記半導体物質はシリコンあるいはゲルマニウムな
どであり、低屈折率層の材質は、二酸化珪素、弗化マグ
ネシウムなどであり、積層膜数を１７〜４５層とした点
を特徴とする。そして、この構成により赤外線透過率が
９００〜１５００ｎｍの範囲で平均８０％以上、可視光
線の透過率が４００〜８００ｎｍの範囲内で０．１％以
下とすることができ、光源と組み合わせて、光源を視認
することができない赤外線照射光源を得ることが可能と
なる。According to the present invention, there is provided a visible light blocking infrared ray transmitting filter comprising a high refractive index layer made of a semiconductor material on at least one of the front and back surfaces of a substrate made of glass, quartz, plastic, or the like. A filter in which low-refractive-index layers made of a transparent dielectric are alternately laminated, and a filter that blocks visible light from a light source and transmits infrared light by multilayer film interference. The semiconductor material is silicon or germanium, and has a low refractive index. The material of the rate layer is silicon dioxide, magnesium fluoride, or the like, and is characterized in that the number of laminated films is 17 to 45. With this configuration, the infrared transmittance can be 80% or more on average in the range of 900 to 1500 nm, and the visible light transmittance can be 0.1% or less in the range of 400 to 800 nm. It is possible to obtain an infrared irradiation light source in which the light cannot be visually recognized.
【０００６】[0006]
【発明の実施の形態】図１は、光源であるハロゲンラン
プ１の周りに、円筒形フィルター２を配設した例で、該
円筒形フィルター２は、ガラス・石英・プラスチックな
ど、適宜の赤外線を透過する材料で作製された円筒形の
基板２１の表面に、上記の可視光線遮断赤外線透過フィ
ルター２２が積層されている。この場合、フィルターは
光源の全周面に設けるのではなく、光源とリフレクター
の前面部分にのみ設けても良い。図３は、ハロゲンバル
ブ１の表面に直接、上記の可視光線遮断赤外線透過フィ
ルター２２を積層させた例である。FIG. 1 shows an example in which a cylindrical filter 2 is provided around a halogen lamp 1 as a light source. The cylindrical filter 2 emits an appropriate infrared ray such as glass, quartz, plastic or the like. On the surface of a cylindrical substrate 21 made of a transparent material, the above-mentioned visible light blocking infrared transmission filter 22 is laminated. In this case, the filter may not be provided on the entire peripheral surface of the light source, but may be provided only on the front surface of the light source and the reflector. FIG. 3 shows an example in which the visible light blocking infrared transmission filter 22 is directly laminated on the surface of the halogen bulb 1.
【０００７】[0007]
【実施例】以下、本発明の可視光線遮断赤外線透過フィ
ルターの実施例をを示す。この実施例においては、シリ
コンからなる高屈折率層と、二酸化珪素からなる低屈折
率層を交互に１９層積層させており、その断面構造を図
２に示す。また。基板面からの各層の材料とその光学的
膜厚を表１に、その分光特性を図４に示す。EXAMPLES Examples of the visible light blocking infrared transmission filter of the present invention will be described below. In this embodiment, nineteen high-refractive-index layers made of silicon and low-refractive-index layers made of silicon dioxide are alternately laminated, and the cross-sectional structure is shown in FIG. Also. The material of each layer from the substrate surface and its optical film thickness are shown in Table 1, and its spectral characteristics are shown in FIG.
【表１】 [Table 1]
【０００８】[0008]
【発明の効果】本発明の可視光線遮断赤外線透過フィル
ターは、上記フィルターの分光特性を見れば明らかなよ
うに、上述の先行例と異なり、約９００〜８５０ｎｍに
極めて急峻な透過帯域の端部を有し、本発明によって光
源が視認出来ない効率の良い赤外線照射用光源を得るこ
とが出来たものである。As is apparent from the spectral characteristics of the above-mentioned filter, the visible light cut-off infrared transmitting filter of the present invention differs from the above-mentioned prior example in that the end portion of the transmission band which is extremely steep at about 900 to 850 nm is formed. Thus, according to the present invention, an efficient light source for infrared irradiation in which the light source cannot be visually recognized was obtained.
【図１】本発明の可視光線遮断赤外線透過フィルターの
光源への装着法の１例を示す部分断面図である。FIG. 1 is a partial cross-sectional view showing one example of a method for mounting a visible light blocking infrared transmission filter of the present invention on a light source.
【図２】本発明の可視光線遮断赤外線透過フィルターの
構成の１例を示す概念図である。FIG. 2 is a conceptual diagram showing one example of a configuration of a visible light blocking infrared transmission filter of the present invention.
【図３】本発明の可視光線遮断赤外線透過フィルターの
光源への装着法の他の例を示す光源ランプの側面図であ
る。FIG. 3 is a side view of a light source lamp showing another example of a method of mounting the visible light blocking infrared transmission filter of the present invention on a light source.
【図４】本発明の可視光線遮断赤外線透過フィルターの
分光透過特性を示すグラフである。FIG. 4 is a graph showing the spectral transmission characteristics of the visible light blocking infrared transmission filter of the present invention.
１ ハロゲンランプ ２ 円筒形フィルター ２１ 基板 ２２ 可視光線遮断赤外
線透過フィルターDESCRIPTION OF SYMBOLS 1 Halogen lamp 2 Cylindrical filter 21 Substrate 22 Visible light blocking infrared transmission filter
Claims (5)
方の面に、半導体物質からなる高屈折率層と、透明誘電
体からなる低屈折率層を交互に積層させ、多層膜干渉に
より、光源からの可視光線を遮断し赤外線を透過するフ
ィルターであって、 積層膜数を１７〜４５層であり、こりによって赤外線透
過率が９００〜１５００ｎｍの範囲で平均８０％以上、
可視光線の透過率が４００〜８００ｎｍの範囲内で０．
１％以下であることを特徴とする可視光線遮断赤外線透
過フィルターA high refractive index layer made of a semiconductor substance and a low refractive index layer made of a transparent dielectric are alternately laminated on at least one of the front and back surfaces of a transparent substrate. A filter that blocks visible light from and transmits infrared light, wherein the number of laminated films is 17 to 45 layers, and the infrared transmittance is in the range of 900 to 1500 nm due to stiffness.
When the transmittance of visible light is within the range of 400 to 800 nm, the transmittance is 0.1%.
A visible light blocking infrared transmission filter characterized by being 1% or less.
マニウムなどであり、低屈折率層の材質は、二酸化珪
素、弗化マグネシウムなどであることを特徴とする請求
項１の可視光線遮断赤外線透過フィルター2. The infrared ray transmitting filter according to claim 1, wherein the semiconductor material is silicon or germanium, and the material of the low refractive index layer is silicon dioxide, magnesium fluoride or the like.
認することができない、赤外線照射光源であることを特
徴とする請求項１あるいは請求項２の可視光線遮断赤外
線透過フィルター3. The visible light blocking infrared transmission filter according to claim 1, wherein the light source is an infrared irradiation light source, the light source being invisible through the multilayer filter.
光源とリフレクターの全面、または光源の周りに配した
ことを特徴とする請求項１ないし請求項３の何れかの可
視光線遮断赤外線透過フィルター4. A substrate having the multilayer filter,
The visible light blocking infrared transmission filter according to any one of claims 1 to 3, wherein the filter is disposed on the entire surface of the light source and the reflector or around the light source.
に直接積層させたことを特徴とする請求項１ないし請求
項３の何れかの可視光線遮断赤外線透過フィルター5. The visible light blocking infrared transmission filter according to claim 1, wherein said multilayer filter is directly laminated on a light source bulb.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12405099A JP4544662B2 (en) | 1999-04-30 | 1999-04-30 | Visible light blocking infrared transmission filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12405099A JP4544662B2 (en) | 1999-04-30 | 1999-04-30 | Visible light blocking infrared transmission filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2000314807A true JP2000314807A (en) | 2000-11-14 |
| JP4544662B2 JP4544662B2 (en) | 2010-09-15 |
Family
ID=14875751
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12405099A Expired - Lifetime JP4544662B2 (en) | 1999-04-30 | 1999-04-30 | Visible light blocking infrared transmission filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4544662B2 (en) |
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|---|---|---|---|---|
| WO2004096365A2 (en) * | 2003-04-25 | 2004-11-11 | Patent-Treuhand-Gesellschaft Für Elektrische Glüh Lampen Mbh | Infrared radiator and irradiation device |
| WO2006051664A1 (en) * | 2004-11-12 | 2006-05-18 | Tokai Optical Co., Ltd. | Infrared-transmitting cover |
| JP2008505001A (en) * | 2004-07-05 | 2008-02-21 | オー・ツェー・エリコン・バルザース・アクチェンゲゼルシャフト | Night vision system for vehicles |
| WO2008042518A2 (en) * | 2006-10-04 | 2008-04-10 | General Electric Company | Lamp for night vision system |
| WO2008139363A2 (en) * | 2007-05-09 | 2008-11-20 | Philips Intellectual Property & Standards Gmbh | System comprising an infrared radiation source and an infrared radiation sensor |
| WO2011007435A1 (en) * | 2009-07-16 | 2011-01-20 | 株式会社山野光学 | Aperture stop |
| JP2012137728A (en) * | 2010-12-10 | 2012-07-19 | Asahi Glass Co Ltd | Infrared transmission filter and imaging apparatus using the same |
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|---|---|---|---|---|
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| WO2004096365A2 (en) * | 2003-04-25 | 2004-11-11 | Patent-Treuhand-Gesellschaft Für Elektrische Glüh Lampen Mbh | Infrared radiator and irradiation device |
| JP4787826B2 (en) * | 2004-07-05 | 2011-10-05 | エリコン・トレーディング・アクチェンゲゼルシャフト，トリュープバッハ | Night vision system for vehicles |
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| WO2008042518A3 (en) * | 2006-10-04 | 2008-11-27 | Gen Electric | Lamp for night vision system |
| WO2008139363A3 (en) * | 2007-05-09 | 2009-04-30 | Philips Intellectual Property | System comprising an infrared radiation source and an infrared radiation sensor |
| WO2008139363A2 (en) * | 2007-05-09 | 2008-11-20 | Philips Intellectual Property & Standards Gmbh | System comprising an infrared radiation source and an infrared radiation sensor |
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| JP2013054368A (en) * | 2012-10-22 | 2013-03-21 | Panasonic Corp | Infrared optical filter and production method of the same |
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| US10559505B2 (en) | 2014-01-22 | 2020-02-11 | Lintec Corporation | Protective film-forming film, sheet for forming protective film, complex sheet for forming protective film, and inspection method |
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| EP2924713A1 (en) * | 2014-03-25 | 2015-09-30 | Toshiba Lighting & Technology Corporation | Heater with visible light reducing optical film |
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| US10829641B2 (en) | 2015-05-22 | 2020-11-10 | Fujifilm Corporation | Coloring composition, film, color filter, pattern forming method, method for manufacturing color filter, solid image pickup element, and infrared sensor |
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| JP2018037667A (en) * | 2017-10-12 | 2018-03-08 | リンテック株式会社 | Composite sheet for protection film formation and laser printing method |
| WO2020053832A1 (en) * | 2018-09-14 | 2020-03-19 | 3M Innovative Properties Company | Optical film |
| CN112673290A (en) * | 2018-09-14 | 2021-04-16 | 3M创新有限公司 | Optical film |
| CN110109207A (en) * | 2019-05-20 | 2019-08-09 | 深圳市利丰达展贸科技有限公司 | A kind of photosensitive radar coating structure of polychrome and film plating process |
| CN114787670A (en) * | 2019-12-09 | 2022-07-22 | 3M创新有限公司 | Optical filter and optical system |
| WO2022027589A1 (en) * | 2020-08-07 | 2022-02-10 | 3M Innovative Properties Company | Optical stack and housing for electronic device |
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