Canon Kabushiki Kaisha

Sunao Miyazaki

Takeshi Nomura

Kiyoshi Yamamoto

Tetsuo Kuwabara

Masashi Mashige

Nobukazu Yogo

Nobuyuki Nakagawa

A molding method for optical element is disclosed in which a glass material prepared for weight is introduced into a mold and then heated to soften, and subsequently pressed with the mold to mold an optical element. The glass material is heated to have a viscosity of 10.sup.5 to 10.sup.7 dPaS and press-molded with the mold having a temperature equivalent to a viscosity of 10.sup.9 to 10.sup.11 dPaS of the glass material.

Molding method for optical element

A method and apparatus for forming an optical device of a desired shape presses a heat-softened optical material using a set of molds. The optical material is aligned with respect to the molds by two or more aligning members which move around the center of the mold relative to each other. The optical material may also be aligned by inserting a pin into an aligning hole which is fixed to the mold body and has been aligned with respect to the molds.

Optical-device forming method and apparatus

This invention is to prevent coloring or clouding of the molded article, and also to prevent fusion between the glass blank and the mold member and crack formation in the molded article. The glass blank is provided with the surface layer containing a lower content in water-soluble components than in the core part of the glass base, and a hydrocarbon coating layer formed on the layer. The blank is then press molded.

Method for producing optical element by press molding a blank having a

Disclosed is a glass blank used in a producing process for molding an optical element by heating a glass material and press molding the glass material in a mold having optical functional surfaces. Employed is the glass blank having the glass surface coated with a reaction preventive layer and a hydrocarbon layer or with the hydrocarbon layer.

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Kawasaki, Japan

Sunao Miyazaki