US 7,456,380 B2
Asymmetrical microlenses on pixel arrays
R. Daniel McGrath, Pittsford, N.Y. (US); and Ronald W. Wake, Hilton, N.Y. (US)
Assigned to Eastman Kodak Company, Rochester, N.Y. (US)
Filed on Oct. 18, 2005, as Appl. No. 11/253,915.
Claims priority of provisional application 60/686106, filed on Jun. 01, 2005.
Prior Publication US 2006/0273239 A1, Dec. 07, 2006
Int. Cl. H01L 27/00 (2006.01)
U.S. Cl. 250—208.1  [257/294; 257/432; 250/214.1; 250/216; 359/619] 12 Claims
OG exemplary drawing
 
1. An image sensor comprising:
(a) a plurality of pixels each comprising a photosensitive site, wherein the plurality of pixels includes an asymmetrical arrangement of the photosensitive sites such that at least one distance in either an x direction or a y direction between individual photosensitive sites is not constant; and
(b) a plurality of asymmetrical-shaped microlenses asymmetrically positioned over the photosensitive sites such that an optical axis of each microlens is aligned with a center of a respective photosensitive site; wherein incoming light is directed in a predetermined direction onto the respective photosensitive site by an asymmetrical surface of each microlens for capturing the light in a substantially uniform manner.