Patent ID: 8881489

Claim:
A light control process for controlling an amount of light passing through a multiple sheet, comprising a plurality of opposed transparent sheet layers, the light control process comprising: (a) reducing the amount of light passing through the multiple sheet from an initial level to a reduced level by supplying moisture to a gas supply port and into a space between transparent sheet layers forming the multiple sheet while discharging gas from a discharge port located at a position opposite to the supply port; (b) after conducting the step (a), increasing the amount of light passing through the multiple sheet from said reduced level to at least said initial level by reducing pressure in the space between the transparent sheet layers of the multiple sheet such that the transparent sheet layers are brought into close contact with each other with the moisture existing between the transparent sheet layers, wherein said increasing the amount of light is performed in a shorter time period than a time period of said reducing the amount of light; and (c) after conducting the step (b), discharging the moisture existing between the transparent sheet layers of the multiple sheet through either the gas supply port or another discharge port.