| 摘要 |
<p>PURPOSE:To obtain an optical shutter element which can work at a low level of voltage, by putting a thin film of a low dielectric constant having an electro- optical effect onto a transparent flat plate of a high dielectric constant to form a solid state flat plate and then providing transparent electrodes on both sides of the flat plate in order to make use of a longitudinal effect. CONSTITUTION:A thin film layer 20 having an electro-optical effect with a comparatively low dielectric constant is formed on at least a single primary surface of a transparent flat plate 10 having a comparatively high dielectric constant. Plural transparent crossed finger type electrodes 30 are provided on the layer 30 to apply the positive potential with space D' and width W'. At the same time, a transparent entire-surface electrode is provided at the opposite side to the electrode 30 to apply the negative potential or to be used as an earth electrode. Then D' 2W' is satisfied. As a result, an optical shutter element which can work at a low level of voltage can be obtained.</p> |
