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An optical unit having an electrooptical element whose optical properties are changed as a function of a voltage applied thereto to modulate an incident light in response to the applied voltage. The optical unit includes a shielding member for electrically shielding at least a portion thereof which

An optical unit having an electrooptical element whose optical properties are changed as a function of a voltage applied thereto to modulate an incident light in response to the applied voltage. The optical unit includes a shielding member for electrically shielding at least a portion thereof which includes the electrooptical element from an external electric field. The shielding member protects the electrooptical element from an influence of an external electric field on an electrooptical effect of the electrooptical element. The shielding member may be an electrically conductive member, such as a metallic casing accommodating the electrooptical element, or an electrically conductive layer covering a housing accommodating the element.

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An optical unit comprising: an electrooptical element which receives an incident light beam and has a pair of electrodes disposed on opposing faces thereof, and whose optical properties are changed as a function of a voltage applied between said pair of electrodes, whereby said incident light beam t

An optical unit comprising: an electrooptical element which receives an incident light beam and has a pair of electrodes disposed on opposing faces thereof, and whose optical properties are changed as a function of a voltage applied between said pair of electrodes, whereby said incident light beam transmitted through said electrooptical element is influenced in response to said applied voltage; a covering member for accommodating therein at least said electrooptical element, so as to permit said incident light beam to be incident upon said electrooptical element; and shielding means for electrically shielding at least said electrooptical element from an external electric field, said shielding means comprising an electrically conductive member formed separate from said covering member and said electrooptical element, said shielding means being disposed outside said covering member and accommodating therein said covering member and said electrooptical element, said shielding means being electrically connected to one of said pair of electrodes or grounded.