OPTICAL FILTER AND APPLICATION OF THE SAME

To provide an optical filter excellent in near infrared ray shielding property irrespective of being thin in thickness.SOLUTION: The optical filter satisfies the following requirements (a) to (d): (a) in a region of wavelength 700 nm to 900 nm, minimal value (ODa-0) of optical density (OD value) of...

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Bibliographic Details
Main Authors OHASHI YUKIE, UCHIDA YOSUKE, KAWABE YASUNORI, NAGAYA KATSUYA, KISHIDA HIROYUKI, SHIGEOKA DAISUKE
Format Patent
LanguageEnglish
Japanese
Published 19.08.2021
Subjects
ACCESSORIES THEREFOR
ADHESIVES
APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES
APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM
BASIC ELECTRIC ELEMENTS
CHEMISTRY
CINEMATOGRAPHY
DYES
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
ELECTROGRAPHY
HOLOGRAPHY
LAKES
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
MORDANTS
NATURAL RESINS
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICS
ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES
PAINTS
PHOTOGRAPHY
PHYSICS
POLISHES
SEMICONDUCTOR DEVICES
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Summary:To provide an optical filter excellent in near infrared ray shielding property irrespective of being thin in thickness.SOLUTION: The optical filter satisfies the following requirements (a) to (d): (a) in a region of wavelength 700 nm to 900 nm, minimal value (ODa-0) of optical density (OD value) of light entering a surface of the optical filter from a vertical direction is 2.0 or more; (b) in a region of wavelength 430 nm to 580 nm, average value (Ta-0) of transmittance of light entering a surface of the optical filter from a vertical direction is 40% or more; (c) in a region of wavelength 420 nm to 900 nm, average value (Rfa-5) of reflectance ratio of light entering a surface of the optical filter from an angle of 5 degrees to a vertical direction is 20% or less; (d) at least three types of compound (A) having absorption maximum in a region of wavelength 650 nm or more and less than 950 nm are contained.SELECTED DRAWING: None 【課題】厚みが薄くても近赤外線遮蔽性に優れた光学フィルターを提供する。【解決手段】要件（ａ）〜（ｄ）を満たす光学フィルター：（ａ）波長７００ｎｍ〜９００ｎｍの領域において、光学フィルターの面に対して垂直方向から入射する光に対する光学濃度（ＯＤ値）の最小値（ＯＤa-0）が２．０以上である；（ｂ）波長４３０ｎｍ〜５８０ｎｍの領域において、光学フィルターの面に対して垂直方向から入射する光の透過率の平均値（Ｔa-0）が４０％以上である；（ｃ）波長４２０ｎｍ〜９００ｎｍの領域において、光学フィルターの面に対して垂直方向に対して５度の角度から入射する光に対する反射率の平均値（Ｒｆa-5）が２０％以下である；（ｄ）波長６５０ｎｍ以上９５０ｎｍ未満の領域に吸収極大を有する化合物（Ａ）を少なくとも３種含有する層を含む。【選択図】なし
Bibliography:Application Number: JP20200087390