Optical: systems and elements – Lens
Patent
1994-12-21
1997-06-24
Sugarman, Scott J.
Optical: systems and elements
Lens
264 17, G02B 300, B29D 1100
Patent
active
056422288
ABSTRACT:
A resin-molded automotive lens, and a method for producing same, in which sink marks are prevented from being formed in a thin lens surface portion of the lens. In a resin-molded lens having a thin lens surface portion and a thick portion such as a seal leg portion or boss portions formed integrally with at least a part of this lens surface portion, the lens surface portion and the thick portion are formed in separate injections. That is, the thick portion is molded with resin integrally with another lens surface portion in advance, and thereafter the thin lens surface portion is molded with resin integrally with this thick portion, so that in this portion it is possible to reduce the influence of cooling of the resin when the lens surface portion is molded to thereby prevent sink marks from being formed in the lens surface portion.
REFERENCES:
patent: 4225848 (1980-09-01), Roberts
patent: 4566929 (1986-01-01), Waugh
patent: 4800980 (1989-01-01), Hideo et al.
patent: 4999142 (1991-03-01), Fukushima et al.
patent: 5275764 (1994-01-01), Hettinga
patent: 5316702 (1994-05-01), Blum et al.
patent: 5335155 (1994-08-01), Hanson et al.
Takezawa Shiro
Yanagihara Hirokazu
Koito Manufacturing Co. Ltd.
Sugarman Scott J.
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