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Proceedings Paper

Precision Molding Of Aspherical Plastic Lens For Cam-Corder And Projection Tv
Author(s): Masayuki Muranaka; Masao Takagi; Terunori Maruyama
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Paper Abstract

New molding processes have been successfully developed for precise aspherical lenses of cam-corder or projection TV. They are founded on our idea that precise aspherical lens can be molded by securing the molding deformation axial and constant in every shot. This paper presents a) computer simulation of thermal process and molding deformation, b) factors and process to secure the molding deformation constant i.e. repeatability of molded aspherical surface figure, c) molding dies and injection machine to realize temperature homogeneity of molding lens and stability of injected weight, and d) pre-correction of surface figure on optically polished insert to compensate surface deformation in the molding process. Additionally applications of the aspherical plastic lens manufactured industrially with new process are also provided.

Paper Details

Date Published: 13 July 1988
PDF: 11 pages
Proc. SPIE 0896, Replication and Molding of Optical Components, (13 July 1988); doi: 10.1117/12.944470
Show Author Affiliations
Masayuki Muranaka, Hitachi, Ltd. (Japan)
Masao Takagi, Hitachi, Ltd. (Japan)
Terunori Maruyama, Hitachi, Ltd. (Japan)


Published in SPIE Proceedings Vol. 0896:
Replication and Molding of Optical Components
Max J. Riedl, Editor(s)

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