Patent ID: 9664356
Date: 2017-05-30
CPC Classifications: F21K,F21V,F21W,F21Y,F25D,G02B

Claim:
1. An illumination lens, comprising: a light incident surface that defines a cavity having rotational symmetry with respect to a central axis, the light incident surface configured to receive light from an underlying light emitting element; a light exiting surface comprising a flat surface intersecting the central axis and a convex surface extended from the flat surface toward a side portion; and a bottom surface connecting the light incident surface and the light exiting surface, wherein: an uppermost part of the light exiting surface has an infinite intersecting point with a horizontal axis vertical to the central axis in a cross-sectional view; a lowermost part of the bottom surface has two intersecting points with the horizontal axis in the cross-sectional view; and the bottom surface comprises an inclined surface having an angle formed by the bottom surface with respect to the horizontal axis.