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US 5,922,369 AGranted
Apparatus for making a synthetic resin layered lens for a vehicle lighting device
AssigneeKoito Manufacturing Co., Ltd.
InventorsHirokazu Yanagihara, Shiro Takezawa
Life of this patent
Estimating the term…
Abstract
A synthetic resin layered lens for a vehicle lighting device in which an upper lens layer is disposed on a lower lens layer thereby forming a layered lens of integral construction. The lower lens layer is molded in a state that the surface of the lower lens layer where it contacts the upper lens layer, faces the injection gate. The gate scar of the lower layer is thus hidden by the upper layer.
Claims8
An apparatus for molding a synthetic resin layered lens, said apparatus comprising:
- a first mold element having a hot runner formed therein;
- a second mold element which cooperates with the first mold element to define a first cavity;
- means for injecting a first resin into said first cavity through said hot runner to form a lower lens element, a tip of said hot runner, which opens into said first cavity, being disposed at a position which corresponds to a contact surface of the lower lens element;
- a third mold element;
- means for transferring the lower lens element from said first cavity to a position opposite said third mold element to define a second cavity between the contact surface and said third mold element;
- and
- means for injecting a second resin into said second cavity to form an upper lens element on the contact surface of the lower lens element;
- wherein a gate through which the second resin is injected into the second cavity is positioned at an outer most peripheral surface of the second cavity said position corresponding to the outer most periphery of the upper lens element.
5 more elements
Dependencies are inferred from the claim text.