Title:
OPTICAL FILTER, IMAGING DEVICE, AND OPTICAL SENSOR
Document Type and Number:
WIPO Patent Application WO/2020/255927
Kind Code:
A1
Abstract:
The present invention relates to an optical filter comprising an absorption layer and a reflection layer constituted of a dielectric multilayer film, the absorption layer comprising: a transparent resin having a glass transition point of 130°C or higher; and a near-infrared-ray-absorbing colorant (A) which, in the transparent resin, has a maximum absorption wavelength in the wavelength range of 850-1,100 nm, which has an average internal transmittance of 90% or higher for light having wavelengths of 490-560 nm, which has an average internal transmittance of 90% or higher for light having wavelengths of 590-630 nm, and which, in the wavelength range of 650-1,150 nm, has an internal transmittance of 50% at wavelengths, the difference between which is 180 nm or greater. The near-infrared-ray-absorbing colorant (A) has a difference in average transmittance of 490-560 nm light of 10% or less between in dichloromethane and in the transparent resin and has a difference in average transmittance of 590-630 nm light of 10% or less between in dichloromethane and in the transparent resin.
Inventors:
YAMADA SAYURI (JP)
SHIONO KAZUHIKO (JP)
SHIONO KAZUHIKO (JP)
Application Number:
PCT/JP2020/023450
Publication Date:
December 24, 2020
Filing Date:
June 15, 2020
Export Citation:
Assignee:
AGC INC (JP)
International Classes:
C09B53/00; G02B5/22
Domestic Patent References:
| WO2018043564A1 | 2018-03-08 | |||
| WO2017164024A1 | 2017-09-28 |
Foreign References:
| JP2011026377A | 2011-02-10 | |||
| JP2009280639A | 2009-12-03 | |||
| JP2008260899A | 2008-10-30 | |||
| JP2007197492A | 2007-08-09 | |||
| JP2002082219A | 2002-03-22 |
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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