Title:
INFRARED CUT FILTER AND IMAGING OPTICAL SYSTEM
Document Type and Number:
Japanese Patent JP2018132609
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide an infrared cut filter showing sufficiently small changes in a transmittance spectrum in a specific wavelength range even when an incident angle of light changes.SOLUTION: An infrared cut filter (1a) includes a near-infrared reflection film (20) and an absorption film (30). The near-infrared reflection film (20) and the absorption film (30) impart characteristics (A) to (E) to a first laminate and a second laminate: (A) 700nm≤λ(0°,70%)<λ(0°,20%)≤770nm; (B) 650nm≤λ(40°,70%)<λ(40°,20%)≤720nm; (C) λ(40°,20%)<λ(40°,20%); (D) a spectral transmittance for light incident to the second laminate is 15% or more at λ(0°,20%); and (E) an average of the spectral transmittance for light in the wavelength range from 450 to 600 nm incident to the first laminate and the second laminate is 75% or more.SELECTED DRAWING: Figure 1
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Inventors:
SHINMO KATSUHIDE
KUBO YUICHIRO
TSAI LEI
KUBO YUICHIRO
TSAI LEI
Application Number:
JP2017025363A
Publication Date:
August 23, 2018
Filing Date:
February 14, 2017
Export Citation:
Assignee:
NIPPON SHEET GLASS CO LTD
International Classes:
G02B5/22; B32B7/02; G02B5/26; G03B11/00
Domestic Patent References:
| JP2011100084A | 2011-05-19 | |||
| JP2018004869A | 2018-01-11 |
Foreign References:
| WO2017051867A1 | 2017-03-30 | |||
| WO2016133099A1 | 2016-08-25 |
Attorney, Agent or Firm:
Koichi Kamata
Mitsuhiko Nishio
Mitsuhiko Nishio