Title:
OPTICAL FILTER AND IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2016/133099
Kind Code:
A1
Abstract:
An optical filter is provided with an absorbing layer containing a near-infrared ray absorbing pigment the absorption characteristics of which in dichloromethane satisfy the following conditions:
- An absorption spectrum of 400 nm - 800 nm contains a maximum absorption wavelength λmax between 670 nm and 730 nm.
- The maximum extinction coefficient εA for light of wavelength 430 nm - 550 nm, and the maximum extinction coefficient εB for light of wavelength 670 nm - 730 nm have the following relationship: εB / εA ≥ 65
- In a spectral transmittance curve, the difference is 65 nm or less between the maximum absorption wavelength λmax, and the wavelength λ80 the transmittance of which is 80 % in the wavelengths shorter than the maximum absorption wavelength in the case where the transmittance in the maximum absorption wavelength λmax is 10 %.
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Inventors:
SHIONO KAZUHIKO (JP)
MATSUURA KEIGO (JP)
HOTAKA HIROKI (JP)
MATSUURA KEIGO (JP)
HOTAKA HIROKI (JP)
Application Number:
PCT/JP2016/054485
Publication Date:
August 25, 2016
Filing Date:
February 16, 2016
Export Citation:
Assignee:
ASAHI GLASS CO LTD (JP)
International Classes:
G02B5/22; C09D5/32; C09D7/12; C09D201/00; C09B57/00
Domestic Patent References:
| WO2013054864A1 | 2013-04-18 | |||
| WO2015099060A1 | 2015-07-02 | |||
| WO2016043166A1 | 2016-03-24 |
Foreign References:
| US20140061505A1 | 2014-03-06 | |||
| JPH01228960A | 1989-09-12 | |||
| JPH01228961A | 1989-09-12 |
Attorney, Agent or Firm:
SAKURA PATENT OFFICE, p. c. (JP)
Patent business corporation cherry tree international patent firm (JP)
Patent business corporation cherry tree international patent firm (JP)
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