Claims
- 1. A method of molding a synthetic resin layered lens for a vehicle lighting device comprising the steps of:
- placing first and second mold surfaces in opposition to one another to define a first cavity therebetween;
- injecting resin into said first cavity through a hot runner which is disposed on said first mold surface to form a lower lens layer having at least one seal leg formed thereon, said first mold surface defining a contact surface of said lower lens layer;
- forming a gate scar on said contact surface of said lower lens layer;
- placing said lower lens layer in opposition to a third mold surface to define a second cavity between said third mold surface and said contact surface; and
- injecting resin into said second cavity to form an upper lens layer on said contact surface, said resin being injected into a portion of the second cavity through a gate which corresponds to a peripheral edge of the upper lens layer;
- wherein said seal leg is formed without any gate scars so as to avoid the formation of a stress region within the vehicle lighting device when the seal leg is integrated into said vehicle lighting device.
Parent Case Info
This is a divisional of application Ser. No. 08/245,540 filed May 18, 1994, now U.S. Pat. No. 5,721,039.
US Referenced Citations (4)
Foreign Referenced Citations (4)
Number |
Date |
Country |
1529769 |
May 1969 |
DEX |
2207889 |
Aug 1973 |
DEX |
2607231 |
Oct 1976 |
DEX |
5-337983 |
Dec 1993 |
JPX |
Non-Patent Literature Citations (1)
Entry |
Zweifarben-Spritzgieben, Facherfahrener Konner erlautert, wie man's macht, Arburg Maschinenfabrik Hehl & Sohne, pp. 1-6. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
245540 |
May 1994 |
|