OPTICAL FILTER, ENVIRONMENTAL LIGHT SENSOR, AND SENSOR MODULE

• Main Authors: OTSUKI TOSHIHIRO, NAGAYA KATSUYA, SHIGEOKA DAISUKE, TSUBOUCHI TAKASHI
• Format: Patent
• Language: English; Japanese
• Published: 12.02.2021
• Subjects: ACCESSORIES THEREFOR; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES; APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM; CINEMATOGRAPHY; COLORIMETRY; ELECTROGRAPHY; HOLOGRAPHY; MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT; MEASURING; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHOTOGRAPHY; PHYSICS; RADIATION PYROMETRY; TESTING

To provide an optical filter capable of providing a superior visible light transmittance and near-infrared blocking performance even when the angle of incidence is large.SOLUTION: An optical filter of the present invention has a base material (i) with a light absorbing layer and is configured to pass visible light, the light absorbing layer having an absorption maximum in a wavelength range of 750-1150 nm. In a wavelength range of 850-1050 nm, the optical filter has an average OD value of 2.0 or greater when measured from a direction normal to the optical filter, and 2.0 or greater when measured from an angle of 60° with respect to the direction normal to the optical filter.SELECTED DRAWING: None 【課題】入射角度が大きくなった場合でも優れた可視光透過率と近赤外線カット性能を両立可能な光学フィルターを提供すること。【解決手段】本発明の光学フィルターは、光吸収層を含む基材（ｉ）を有し、かつ、可視光を透過する光学フィルターであって、前記光吸収層が波長７５０〜１１５０ｎｍの領域に吸収極大を有し、波長８５０〜１０５０ｎｍにおいて、前記光学フィルターの垂直方向から測定した場合の平均ＯＤ値が２．０以上であり、かつ、前記光学フィルターの垂直方向に対して６０°の角度から測定した場合の平均ＯＤ値が２．０以上であることを特徴とする。【選択図】なし