Microlens arrays having high focusing efficiency
First Claim
1. A microlens array comprising a plurality of unit cells and a plurality of microlenses, one microlens per unit cell, wherein:
- (a) the array has a focusing efficiency of at least 75 percent; and
(b) at least two of the microlenses differ from one another randomly.
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Abstract
Microlens arrays (105) having high focusing efficiencies are provided. The high focusing efficiencies are achieved by accurately producing the individual microlenses making up the array at high fill factors. Arrays of positive microlenses are produced by forming a master having a concave surface-relief pattern (101) in a positive photoresist (21) using direct laser writing. Through this approach, the problems associated with the convolution of a finite laser beam with a desired profile for a microlens are overcome. The microlens arrays of the invention have focusing efficiencies of at least 75%.
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Citations
9 Claims
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1. A microlens array comprising a plurality of unit cells and a plurality of microlenses, one microlens per unit cell, wherein:
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(a) the array has a focusing efficiency of at least 75 percent; and
(b) at least two of the microlenses differ from one another randomly. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification