US 12,078,905 B2
Electrochromic element, optical filter, lens unit, image pickup apparatus, and window member
Wataru Kubo, Inagi (JP); Kenji Yamada, Yokohama (JP); Satoshi Igawa, Fujisawa (JP); Yuto Ito, Koganei (JP); and Isao Kawata, Kawasaki (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Apr. 6, 2020, as Appl. No. 16/841,446.
Application 16/841,446 is a continuation of application No. PCT/JP2018/035400, filed on Sep. 25, 2018.
Claims priority of application No. 2017-196988 (JP), filed on Oct. 10, 2017; and application No. 2018-149516 (JP), filed on Aug. 8, 2018.
Prior Publication US 2020/0241377 A1, Jul. 30, 2020
Int. Cl. G02F 1/15 (2019.01); B32B 17/10 (2006.01); F21V 14/00 (2018.01); G02B 26/00 (2006.01); G02F 1/1516 (2019.01); G02F 1/157 (2006.01); G09G 3/19 (2006.01); C07D 241/46 (2006.01); C07D 401/04 (2006.01); G02F 1/1514 (2019.01)
CPC G02F 1/15165 (2019.01) [B32B 17/10513 (2013.01); C07D 241/46 (2013.01); C07D 401/04 (2013.01); G02F 2001/15145 (2019.01)] 15 Claims
OG exemplary drawing
 
1. An electrochromic element comprising: a first electrode; a second electrode; and an electrochromic layer disposed between the first electrode and the second electrode, the electrochromic layer containing a solvent, an anodic electrochromic compound, and a cathodic electrochromic compound,
wherein the cathodic electrochromic compound has a substituent containing any one element selected from halogens, sulfur, boron, phosphorus, and silicon, and
the electrochromic element satisfies inequality (1):
GA+H2O−GA+OcOH≥35  inequality (1)
where, in inequality (1), GA+H2O represents a solvation free energy (kcal/mol) of an oxidized form of the anodic electrochromic compound in water, and GA+OcOH represents a solvation free energy (kcal/mol) of the oxidized form of the anodic electrochromic compound in octanol.