| 摘要 |
PURPOSE:To improve uniformity of coloring and discoloring, and to lengthen life of an electrochromic element as well as to prevent spotting, irregular coloring, and peeling of the element by gradually increasing or decreasing an impressed voltage to the element. CONSTITUTION:When coloring, a voltage gradually increasing action with a voltage gradually increasing and decreasing circuit 16 is made to start with a transfer switch 17 switched to the coloring side, and an impressed voltage to an electrochromic element 3 is made to gradually increase. When discoloring, a voltage gradually decreasing action of the circuit 16 is made to start with the switch 17 switched to the discoloring side, and the impressed voltage to the element 3 is made to gradually decrease. A coloring and discoloring speeds in the peripheral and center parts can be uniformalized, and life is lengthened with spotting and irregular coloring of the element eliminated and peeling of the peripheral part prevented even in the large size electrochromic element by relaxing flowing of an excess electricity quantity to the peripheral part of the element 3 by such voltage impressing method.
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