초록 ▼

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

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.

대표청구항 ▼

1. double-sided microlens, comprising:a first mold base and a second mold base, wherein each of said first mold base and said second mold base has a pair of juxtaposed mold cavities for receiving a molten plastic or a plastic preform in a fixed relationship, wherein each one of said juxtaposed mold

1. double-sided microlens, comprising:a first mold base and a second mold base, wherein each of said first mold base and said second mold base has a pair of juxtaposed mold cavities for receiving a molten plastic or a plastic preform in a fixed relationship, wherein each one of said juxtaposed mold cavities contains at least one microlens mold having a size of 10 microns to 25 mm in diameter and a sag of 2 microns to 12.5 mm in a substrate configured to receive said at least one microlens mold in a precise relation to another of said at least one microlens mold; and a set of alignment features for aligning said pair of juxtaposed mold cavities containing said molten plastic or plastic preform; said set of alignment features including a first alignment member comprising a pair of spaced guide pins for engaging a pair of corresponding spaced apertures formed in said second mold base, and a second alignment member comprising a pair of spaced locating bushings tapered for lengthwise engagement with a pair of corresponding spaced tapered apertures in said second mold base; and,a molding assemblage having a first platen and an opposing second platen, said first platen supporting said first mold base and said second platen supporting said second mold base for molding a double-sided microlens in said microlens molds. 2. The apparatus recited in claim 1 wherein said molding assemblage is an injection molding assemblage. 3. The apparatus recited in claim 1 wherein said molding assemblage is a compression molding assemblage. 4. The apparatus recited in claim 1 wherein each one of said pair of juxtaposed mold cavities is polygonally shaped.