| 摘要 |
PURPOSE:To vary a passing wavelength range by arranging plural polarizers and plural electro-optic crystals alternately in the traveling direction of light, and varying voltages applied to the respective crystals. CONSTITUTION:Plural, e.g. 2 crystals C1 and C2 which have such electro-optic effect that birefrigence is caused by an electric field and linear polarized incident light becomes elliptical polarized light on a projection surface and plural, e.g. three polarizers 0, 1, and 2 which transmit only specific polarized components are arranged alternately in series in the traveling direction of the light. The crystals are so directed that the light is influenced by the electrically induced birefrigence, and the axes of polarization of the polarizers are set perpendicular or parallel to the polarization direction of the incident light; and voltages applied to the crystals C1 and C2 through electrodes E1 and E2 are varied to vary the passing band range. |
