| http://www.w3.org/ns/prov#value | - According to this method, a transparent substance layer made of a transparent material, such as plastics or glass, is provided between a lens system and an image pickup part, and a piezoelectric element made of polyvinyl fluoride or the like is attached to the periphery of the transparent substance layer so that the incidence angle of a light ray can be varied by the application of voltage.
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