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US 6,787,072 B2Granted
Apparatus and method for making a double-sided microlens mold and microlens array mold
AssigneeEastman Kodak Company
InventorsJohn Border, Robert Dambrauskas, Craig A. Sadlik
Life of this patent
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Abstract
A method for making a double-sided microlens mold and microlens array mold is described which utilizes a spinning half radius diamond cutting member operated in a plunge cut in a technique similar to milling to cut the optical surface into a diamond turnable material. The method can be used to make high sag lens molds with high accuracy. Microlens array molds can be made with a high degree of uniformity and a nearly 100% fill factor.
Claims7
Method of making a double-sided microlens, comprising the steps of:
- providing a first mold base having alignment members and a mold cavity;
- providing a second mold base having alignment members and a mold cavity;
- mounting a first microlens mold, formed in a substrate, in said mold cavity of said first mold base;
- mounting a second microlens mold, formed in a substrate, in said mold cavity of said second mold base and adjusting said second microlens mold in said mold cavity of said second mold base;
- supportedly arranging said first mold base and said second mold base on a first platen and an opposed second platen, respectively, of a molding apparatus;
- press closing said first platen upon said opposed second platen of said molding apparatus and aligning said fist and second microlens molds in said first mold base and said second mold base forming a single mold cavity;
- introducing a molten plastic into said single mold cavity;
- and
- solidifying said molten plastic in said single mold cavity and forming a double-sided microlens.
6 more elements
Dependencies are inferred from the claim text.