Co-molded optical lenses and methods and devices for forming same
Described herein is method of co-molding an optical lens includes injection-molding a first layer, injection-molding a second layer against at least a portion of the molded first layer to form a co-molded blank, and forming the optical lens from the co-molded blank. Co-molding apparatuses for implementing this and other co-molding methods are also described.
1. A method of co-molding an optical lens, said method comprising:
injection-molding a first layer in a first mold, wherein the molded first layer includes at least one engagement feature defined by a peripheral edge of the molded first layer and one or more flanges or gates extending radially outward from the peripheral edge; removing the molded first layer from the first mold; inserting the molded first layer into a second mold including engaging the at least one engagement feature with a corresponding location of the second mold; in the second mold, injection-molding a second layer against at least a portion of the molded first layer to form a co-molded blank; and forming the optical lens from the co-molded blank.
2. The method of claim 1 , further comprising cooling the molded first layer before said injection-molding the second layer.
3. The method of claim 1 , further comprising rotating at least a portion of the first mold to form at least a portion of the second mold.
4. The method of claim 1 , further comprising heating a least a portion of the first mold during said injection-molding the first layer or heating at least a portion of the second mold during said injection-molding the second layer to control a thickness of the first layer or the second layer, respectively.
5. The method of claim 1 , wherein said injection-molding the first layer comprises injection-molding the first layer from a first material, and
wherein said injection-molding the second layer comprises injection-molding the second layer from a second material different than the first material.
6. The method of claim 5 , wherein said injection-molding the second layer from the second material comprises shielding the first material from at least one of heat, radiation, and ballistic projectiles by the second material.
7. The method of claim 1 , further comprising removing material from a central region of the molded first layer before said injection-molding the second layer.
8. The method of claim 1 , wherein said injection-molding the second layer comprises creating a thermal bond between the molded first layer and the molded second layer.
9. The method of claim 1 , further comprising creating a mechanical bond between the molded first layer and the molded second layer along only a perimeter of the optical lens.
10. The method of claim 1 , further comprising providing an intermediate non-molded layer on the molded first layer before said injection-molding the second layer, and wherein said injection-molding the second layer comprises encapsulating the intermediate non-molded layer entirely between the molded first layer and the molded second layer.
11. The method of claim 1 , wherein said forming the optical lens from the co-molded blank includes at least one of routing or milling the co-molded blank.
12. The method of claim 1 , wherein said engaging further comprises engaging the at least one engagement feature against a complementary feature of a plate of the second mold.