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Title:
OPTICAL FILTER AND CAMERA-EQUIPPED INFORMATION TERMINAL
Document Type and Number:
WIPO Patent Application WO/2019/021666
Kind Code:
A1
Abstract:
This optical filter (1a) is provided with a light absorption layer (10) and satisfies the conditions (i) to (iii) indicated below when light having a wavelength of 300-1200 nm is incident thereon at an angle of incidence of 0°. (i) The average transmittance in the wavelength range of 450-600 nm is 78% or more. (ii) The spectral transmittance in the wavelength range of 750-1080 nm is 1% or less. (iii) The spectral transmittance decreases together with increases in wavelength in the wavelength range of 600-750 nm, and a first IR cutoff wavelength is present in the wavelength range of 620-680 nm. Conditions (i), (ii), and (iii) are satisfied by the light absorption layer (10).

Inventors:
KUBO Yuichiro (Limited 5-27, Mita 3-chome, Minato-k, Tokyo 21, 〒1086321, JP)
Application Number:
JP2018/022491
Publication Date:
January 31, 2019
Filing Date:
June 12, 2018
Export Citation:
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Assignee:
NIPPON SHEET GLASS COMPANY, LIMITED (5-27, Mita 3-chome Minato-k, Tokyo 21, 〒1086321, JP)
International Classes:
G02B5/22; G03B11/00
Domestic Patent References:
WO2017006571A12017-01-12
WO2016043166A12016-03-24
Foreign References:
JP2016157123A2016-09-01
JP2015043061A2015-03-05
JP2011227528A2011-11-10
JP2005325292A2005-11-24
JP2001154015A2001-06-08
JPH1152127A1999-02-26
US20170146708A12017-05-25
US20160326043A12016-11-10
JP6267823B12018-01-24
Attorney, Agent or Firm:
KAMADA Koichi et al. (8th Fl, UMEDA PLAZA BLDG. ANNEX 4-3-25, Nishitenma, Kita-ku, Osaka-sh, Osaka 47, 〒5300047, JP)
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