Invention Grant
- Patent Title: Optical filter and imaging device
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Application No.: US15466118Application Date: 2017-03-22
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Publication No.: US10228500B2Publication Date: 2019-03-12
- Inventor: Yoshiharu Ooi , Kazuhiko Shiono , Asana Yoshioka , Shoko Suzuki , Hiroki Hotaka
- Applicant: AGC Inc.
- Applicant Address: JP Chiyoda-ku
- Assignee: AGC Inc.
- Current Assignee: AGC Inc.
- Current Assignee Address: JP Chiyoda-ku
- Agency: Oblon, McClelland, Maier & Neustadt, L.L.P.
- Priority: JP2015-088818 20150423
- Main IPC: F21V9/04
- IPC: F21V9/04 ; F21V9/06 ; G02B5/08 ; G02B5/20 ; G02B5/28 ; G02B5/22

Abstract:
An optical filter includes: an absorption layer containing a first near-infrared absorbent having a maximum absorption in a wavelength of 660 to 785 nm, and satisfying (i-1) in 620 to 670 nm, on a shorter wavelength side of a wavelength λ (DA_Tmin) exhibiting the maximum absorption, there is a wavelength λSh (DA_T50%) at which a transmittance becomes 50%; and a reflection layer formed of a dielectric multilayered film satisfying (ii-1) in 670 to 1200 nm, there is a near-infrared reflection band in which a transmittance with respect to light at an incident angle of 0° becomes 50% or less, and a wavelength λSh (A2_Ts50%) at which a transmittance of light of an s polarization component out of light at an incident angle of 30° becomes 50%, on a shorter wavelength side of the near-infrared reflection band, is positioned on a longer wavelength side of the wavelength λSh (DA_T50%).
Public/Granted literature
- US20170192144A1 OPTICAL FILTER AND IMAGING DEVICE Public/Granted day:2017-07-06
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