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US 12,017,388 B2Granted
Lens casting system
AssigneeHOYA Optical Labs of America, Inc.
InventorsDavid Olund, Sarawuth Seewattanangkoon, Hannah Vu, Ladawan Chantharadet, Pasin Pudsayapong, Harjit Bhambra, Jeff Brown, Richard Blacker
Life of this patent
Estimating the term…
Abstract
An optical lens casting gasket, wafer, and system and method that provides for more efficient formation of optical lenses employing optically functional wafers.
Claims19
An optical lens mold gasket comprising:
- a gasket body;
- a groove disposed on an internal surface of said body, said groove sized for holding a wafer;
- a vent port formed between an exterior side wall and an interior sidewall of said body and intersecting said groove;
- and,
- a fill port on said body spaced from said groove and configured to direct a flow of mold material to one side of a wafer before said mold material flows to an opposite side of said wafer.
2 more elements
An optical lens mold system comprising:
- a mold;
- a gasket associated with said mold;
- a wafer associated said mold;
- said gasket comprising:
- a body;
- a groove having an upper lip comprising at least one interrupted protrusion formed on an interior surface of the body and sized to receive said wafer and;
- a fill port in a sidewall of said body;
- said wafer shaped such that at least one space is created between a periphery of said wafer and a surface of said groove when said wafer is received in said groove;
- said wafer forming a first and second cavity in said mold on opposite sides of said wafer, respectively, when said wafer is received in said groove;
- and,
- said fill port being positioned on said sidewall of said body such that mold material introduced to said fill port is directed to said first cavity before flowing through said at least one space to said second cavity.
8 more elements
A method of casting a lens comprising:
- placing a wafer into a groove of a gasket associated with a mold such that the wafer forms a front cavity and a back cavity inside the gasket;
- orienting the wafer into the groove such that the wafer is positioned against a vent port formed between an exterior side wall and an interior sidewall of the gasket and intersecting the groove;
- introducing flowable lens material initially into said back cavity and not initially into said front cavity;
- venting air from said front and back cavity during introduction of said flowable lens material initially into said back cavity.
1 more element
Dependencies are inferred from the claim text.