DRIVING DEVICE FOR ELECTROCHROMIC ELEMENT, ELECTROCHROMIC DEVICE, OPTICAL FILTER, IMAGING DEVICE, LENS UNIT, AND WINDOW MATERIAL HAVING ELECTROCHROMIC ELEMENT, AND METHOD FOR DRIVING ELECTROCHROMIC ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide a driving device for an electrochromic element, which suppresses variations of absorbance upon increasing and decreasing absorbance, an electrochromic device, an optical filter, an imaging device, a lens unit, a window material, and a method for driving electrochromic element.SOLUTION: The driving device for an electrochromic element includes a control unit for controlling an electrochromic element having such characteristics that when a Duty ratio is changed from a to b, the transmittance of the electrochromic element varies from Tto Tand when the Duty ratio is changed from b to a, the transmittance of the electrochromic element varies from Tdifferent from Tto Tdifferent from T. The control unit controls in such a manner that a Duty ratio employed for achieving a target transmittance Tby decreasing the transmittance of the electrochromic element is different from a Duty ratio employed for achieving the target transmittance Tby increasing the transmittance of the electrochromic element.