PURPOSE: To permit easy production of a titled element with good accuracy by molding an elastic body with casting molds and using a water soluble inorg. material to constitute the casting molds for molding.
CONSTITUTION: The casting molds such as upper mold 13, lower mold 14 and side mold 15 are first prepd. and these casting molds are constituted of the water soluble inorg. material; for example, a metallic mold is used for only the side mold 15 and the upper mold 13 and the lower mold 14 are constituted of the water soluble inorg. material. After the casting molds are disposed, the elastic material to constitute the elastic body 1-1 is poured into the casting molds. The elastic material is preferably an elastic material which is nonaq. or has no hydrophilicity as the casting molds are to be dissolved away by water. The elastic material is then cured by light or heat, etc.; thereafter, the upper mold 13 is dissolved away. A bottom plate consisting of glass, etc., is laid and the elastic material constituting the elastic body 1-2 is poured between the bottom plate 2 and already molded elastic body 1-1. The lower mold 14 is dissolved away and further the side mold 15 is removed upon curing and thereafter, a side plate 16 is disposed, by which a variable focus optical element is completed.
KUSHIBIKI NOBUO
KAI TAKASHI
KANEKO NORIO
NAKAJIMA TOSHIYUKI
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