US 9,664,356 B2
Illumination lens for short-throw lightingGeneral
US 9,664,356 B2
Illumination lens for short-throw lighting
Tech Center:
2800 Semiconductors/Memory, Circuits/Measuring and Testing, Optics/Photocopying, Printing/Measuring and Testing
Examiner:
Ali Alavi
Art Unit:
2875 Optics
Inventors:
David G. PELKA; William A. PARKYN
Assignee:
Priority:
03/05/12
Filed:
07/30/15
Granted:
05/30/17
Expiration:
03/05/32
Abstract
An illumination lens includes a light incident surface that defines a cavity and has a flat top surface and lateral flanks, the light incident surface configured to receive light from an underlying light emitting element, a light exiting surface having a central indentation and surrounding toroid, and a bottom surface connecting the light incident surface and the light exiting surface. The lateral flank includes a first region extending from the top surface and a second region extended from the first region, the second region is a curved surface, of which the center of the curvature thereof lies on the illumination lens, an intersection of the second region and a horizontal optical axis forms a first point, and the first point is disposed lower than a second point where the bottom surface and the light exiting surface intersect.
Cooperative Patent Classification (CPC)
F25F25D27/00F25DF21Y2115/10F21K9/60F21W2131/305F21V13/02F21YG02B19/0061G02B