| 摘要 |
PURPOSE:To control effectively the transmission and the reflection of the infrared light by sandwiching a ferroelectric liquid crystal between electrodes and impressing a voltage between electrodes. CONSTITUTION:In a call having a very simple construction which sandwiches a ferroelectric liquid crystal 2 between two electrode plates 1 and is provided with a driving electric power source 4, the voltage may be impressed between both electrodes. Thus, the transmission, reflecting, etc., of the infrared ray can be controlled. When the double refraction, or the optical activity of the infrared light is used, the element constructed to arrange a polarizer 3 at the front side or the front/rear side of the cell may be used. Actually, besides these electrode plates and the polarizer, the construction material or protective material is included in a case as a cell supporting body. In case of the transmitting type element, both electrode plates and in case of the reflecting type element, at least one side electrode plate is necessary to have permeability for the infrared light to control. In the transmission factor of the infrared light, the higher factor is desirable, and especially, it is not limited. |
