Title:
MOLDING OF ASPHERICAL LENS
Document Type and Number:
Japanese Patent JPS57205120
Kind Code:
A
Abstract:
PURPOSE: To mold a desired complex aspherical lens readily, by attaching die pieces which form a cavity in a mold so as to form an aspherical face by deformaion due to an injection pressure.
CONSTITUTION: A cavity 14 is formed by providing die pieces 4, 6 in a mold 1. A synthetic resin 17 is injected from a runner 15. Pieces 4, 6 are respectively deformed according to the shapes of their aspherical component faces 10, 13 by an injection pressure at this time and an aspherical shape which approximates to A face 19 and B face 20 of a lens 18 after molding is formed.
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Inventors:
MIYAZAKI MASAMICHI
Application Number:
JP9055181A
Publication Date:
December 16, 1982
Filing Date:
June 12, 1981
Export Citation:
Assignee:
RICOH KK
International Classes:
B29C45/00; B29C39/00; B29C39/26; B29C45/26; B29C61/00; B29D11/00; (IPC1-7): B29D11/00