Title:
OPTICAL FILTER AND IMAGING DEVICE
Document Type and Number:
WIPO Patent Application WO/2016/171219
Kind Code:
A1
Abstract:
An optical filter comprises: an absorption layer including a first near-infrared absorbing agent having an absorption maximum in a wavelength region of 660-785 nm, and satisfying the following requirement (i-1); and a reflection layer formed from a dielectric multilayer film and satisfying the following requirement (ii-1).
(i-1) The absorption layer has a wavelength λSh (DA_T50%) at which transmissivity becomes 50% in a wavelength region of 620-670 nm on the shorter wavelength side from a wavelength λ (DA_Tmin) at which the absorption maximum is shown.
(ii-1) The reflection layer has a near-infrared reflection band in which the transmissivity of light incident at an incidence angle of 0° becomes 50% or less in a wavelength region of 670-1200 nm, and a wavelength λSh (A2_Ts50%) at which the transmissivity of light having an s polarization component out of light incident at an incidence angle of 30° becomes 50% on the shorter wavelength side from the near-infrared reflection band is present on the longer wavelength side from the wavelength λSh (DA_T50%)
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Inventors:
OOI YOSHIHARU (JP)
SHIONO KAZUHIKO (JP)
YOSHIOKA ASANA (JP)
SUZUKI SHOKO (JP)
HOTAKA HIROKI (JP)
SHIONO KAZUHIKO (JP)
YOSHIOKA ASANA (JP)
SUZUKI SHOKO (JP)
HOTAKA HIROKI (JP)
Application Number:
PCT/JP2016/062658
Publication Date:
October 27, 2016
Filing Date:
April 21, 2016
Export Citation:
Assignee:
ASAHI GLASS CO LTD (JP)
International Classes:
G02B5/22; G02B5/28
Foreign References:
| JP2014191346A | 2014-10-06 | |||
| JP2014059550A | 2014-04-03 | |||
| JP2007183525A | 2007-07-19 | |||
| JP2014235258A | 2014-12-15 |
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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