초록 ▼

Optical material, which was already roughly molded, is deposited into a space defined by a top mold, a bottom mold and a drum mold, and is then heated, pressed and molded, thus providing an optical element. By controlling the rate of plastic deformation of the optical material so as to prevent the m

Optical material, which was already roughly molded, is deposited into a space defined by a top mold, a bottom mold and a drum mold, and is then heated, pressed and molded, thus providing an optical element. By controlling the rate of plastic deformation of the optical material so as to prevent the material from entering clearance sections between the outside diameter of the top mold or of the bottom mold and the inside diameter of the drum mold, an optical element of high precision with no burr nor strain is provided at low cost.

대표청구항 ▼

[ What is claimed is:] [1.] A method for manufacturing optical elements, comprising the steps of:supplying an optical material, which was previously roughly molded, to a space defined by a top mold, a bottom mold and a drum mold; andheating and pressing said optical material, wherein a rate of plast

[ What is claimed is:] [1.] A method for manufacturing optical elements, comprising the steps of:supplying an optical material, which was previously roughly molded, to a space defined by a top mold, a bottom mold and a drum mold; andheating and pressing said optical material, wherein a rate of plastic deformation of said optical material is controlled to less than 10 mm/sec during a final deformation process so as to prevent said optical material from flowing into gaps between outer surfaces of said top mold and of said bottom mold and an inner surface of said drum mold, whereby a molded optical element free from peripheral burrs is provided.