| 摘要 |
PURPOSE:To lower a driving voltage and to eliminate a secular change of an element due to long-period driving by forming electrodes and an insulating resin film on a groove wall surface provided on plate type light transmissive ceramic and a flat plate connecting with it. CONSTITUTION:A polarizer 15 is irradiated with light from behind and a voltage is applied between a voltage application electrode group 13 and a common electrode 12 formed on the PLZT flat plate 11, so that the applied part changes in polarization state and the light is transmitted. Electrodes are formed on the groove wall surface for electrode arrangement and the surface of the flat plate 11 connecting with it to prevent an electric field from being applied to a part B which is easily congested, and the insulating resin film 14 makes a part C hard to strain mechanically, thereby eliminating deterioration at the parts B and C. Therefore, while the driving voltage is lowered, deterioration of the element due to long-period driving is eliminated and the reliability is improved.
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