The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 1990
Filed:
Jul. 10, 1989
David P Hamblen, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
Each individual light emitter of a LED linear array is imaged by a discrete step-index light guide and gradient index microlens device. The light guides consist of high refractive index cores, each surrounded by low refractive index matter. A multiplicity of light guides are deposited in channels formed in a host material, such as a silicon wafer. The host material between adjacent channels functions as an opaque separator to prevent cross-talk between adjacent light guides. Optically bonded to the LED array, the light guides conduct a large portion of the diffuse light emitted to a series of microlenses optically bonded to and in registration with the exit end of each light guide. The microlenses are constructed in a transparent substrate, with each microlens having a spherical or aspherical gradient index profile and short focal length.