OPTICAL FILTER AND IMAGING APPARATUS

• Main Authors: SHIONO KAZUHIKO, HIGASHIDAMORI SAYURI, HODAKA HIROKI
• Format: Patent
• Language: English; Japanese
• Published: 24.08.2017
• Subjects: OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS

PROBLEM TO BE SOLVED: To provide an optical filter including an absorption layer in which temperature dependency of an optical characteristic is suppressed.SOLUTION: The optical filter includes an absorption layer comprising a first absorber and a second absorber having absorption wavelength regions which are at least partially overlap in a wavelength range from 350 to 1200 nm. The first absorber and the second absorber have a first transition wavelength region and a second transition wavelength region, respectively, where transition from a transmission wavelength region to a cutoff wavelength region appears. The first absorber shows a shift toward a shorter wavelength side of a spectral transmittance curve in the first transition wavelength region with elevation of temperature; and the second absorber shows a shift toward a longer wavelength side of a spectral transmittance curve in the second transition wavelength region with elevation of temperature.SELECTED DRAWING: None 【課題】光学特性の温度依存性が抑制された吸収層を備えた光学フィルタを提供する。【解決手段】波長３５０〜１２００ｎｍに少なくとも部分的に重なり合う吸収波長域を有する第１の吸収体および第２の吸収体を含む吸収層を備え、前記第１の吸収体および前記第２の吸収体はそれぞれ、透過波長域から遮断波長域に遷移する、第１の遷移波長域および第２の遷移波長域を有し、前記第１の吸収体は、温度の上昇とともに前記第１の遷移波長域における分光透過率曲線を短波長側にシフトし、前記前記第２の吸収体は、温度の上昇とともに前記第２の遷移波長域における分光透過率曲線を長波長側にシフトする光学フィルタ。【選択図】なし