US 11,681,196 B2
Electrochromic device, control device of electrochromic device, and control method of electrochromic device
Tohru Hasegawa, Kanagawa (JP); and Keiichiroh Yutani, Kanagawa (JP)
Assigned to RICOH COMPANY, LTD., Tokyo (JP)
Filed by Ricoh Company, Ltd., Tokyo (JP)
Filed on Jul. 14, 2020, as Appl. No. 16/928,249.
Claims priority of application No. JP2019-139469 (JP), filed on Jul. 30, 2019.
Prior Publication US 2021/0033939 A1, Feb. 4, 2021
Int. Cl. G02F 1/157 (2006.01); G02F 1/155 (2006.01); G02F 1/163 (2006.01)
CPC G02F 1/157 (2013.01) [G02F 1/155 (2013.01); G02F 1/163 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An electrochromic device comprising:
an electrochromic element operating in at least one of a first optical characteristic state and a second optical characteristic state;
a temperature sensor to measure temperature; and
circuitry configured to control voltage to be applied to the electrochromic element, such that the second optical characteristic state becomes constant irrespective of the measured temperature,
wherein the voltage to be applied includes a plurality of periods of a periodic fluctuation voltage, and each of the periods of the periodic fluctuation voltage includes times for applying at least two voltages of different magnitudes respectively.
 
9. A control device for controlling an electrochromic device including: an electrochromic element operating in at least one of a first optical characteristic state and a second optical characteristic state; and a temperature sensor to measure temperature, the control device comprising:
circuitry configured to control voltage to be applied to the electrochromic element such that the second optical characteristic state becomes constant irrespective of measured temperature,
wherein the voltage to be applied includes a plurality of periods of a periodic fluctuation voltage, and each of the periods of the periodic fluctuation voltage includes times for applying at least two voltages of different magnitudes respectively.
 
12. A control method of an electrochromic device for controlling an electrochromic device including: an electrochromic element operating in at least one of a first optical characteristic state and a second optical characteristic state; and a temperature sensor to measure temperature, the control method comprising:
controlling voltage to be applied to the electrochromic element such that the second optical characteristic state becomes constant irrespective of temperature,
wherein the voltage to be applied includes a plurality of periods of a periodic fluctuation voltage, and each of the periods of the periodic fluctuation voltage includes times for applying at least two voltages of different magnitudes respectively.