OPTICAL FILTER AND IMAGE CAPTURING DEVICE
To provide an optical filter which is advantageous in preventing color unevenness of an image formed by an image capturing device.SOLUTION: An optical filter (1a) includes a light absorption layer (10). The light absorption layer absorbs light in at least a part of the near-infrared range. The optic...
Saved in:
Main Authors | , |
---|---|
Format | Patent |
Language | English Japanese |
Published |
25.04.2019
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | To provide an optical filter which is advantageous in preventing color unevenness of an image formed by an image capturing device.SOLUTION: An optical filter (1a) includes a light absorption layer (10). The light absorption layer absorbs light in at least a part of the near-infrared range. The optical filter (1a) satisfies predetermined conditions regarding the transmittance when 300-1200 nm light enters the optical filter at incident angles of 0°, 30°, and 40°. Values of IE, IE, and IEthat are defined for two incident angles θ1°, θ2° (θ1<θ2)) selected from 0°, 30°, and 40° and a range, defined as a difference between a maximum value and a minimum value of IE, IE, and IEfor the same two incident angles θ1°, θ2°, satisfy predetermined conditions.SELECTED DRAWING: Figure 1A
【課題】撮像装置によって生成される画像に色むらが発生することを防止するのに有利な光学フィルタを提供する。【解決手段】光学フィルタ(1a)は、光吸収層(10)を備える。光吸収層は、近赤外線領域の少なくとも一部の光を吸収する。光学フィルタ(1a)は、0°、30°、及び40°の入射角度で波長300nm〜1200nmの光を当該光学フィルタに入射させたときに、透過率に関する所定の条件を満たす。また、0°、30°、及び40°から選ばれる2つの入射角度θ1°及びθ2°(θ1<θ2)に対して定義されるIEθ1/θ2CR、IEθ1/θ2CG、及びIEθ1/θ2CB及び同一の2つの入射角度θ1°及びθ2°に対するIEθ1/θ2CR、IEθ1/θ2CG、及びIEθ1/θ2CBの最大値から最小値を差し引いた差であるレンジが所定の条件を満たす。【選択図】図1A |
---|---|
Bibliography: | Application Number: JP20170193904 |