Patent ID: 8408753

Claim:
An LED lamp, comprising: a base having a first end and a recess formed in the first end of the base; an LED device mounted in the recess and having a circuit board, and an LED electrically connected with the circuit board; a transparent convex lens connected securely with the first end of the base, mounted in the recess, separated from the LED device, and having a first end; a second end opposite to the first end of the convex lens; a convex section formed at the first end of the convex lens; an imaging section formed at the second end of the convex lens; and a cavity axially formed in the imaging section, encompassing the LED, and having a bottom having a periphery; an opening opposite to the bottom of the cavity and having a periphery; an inner side surface; a first edge formed around the periphery of the bottom of the cavity, and having multiple first convex arcs spaced at intervals at the periphery of the bottom of the cavity, and each respectively having an arc length; and multiple first concave arcs spaced at intervals at the periphery of the bottom of the cavity beside the first convex arcs; a second edge formed around the periphery of the opening of the cavity and having multiple second convex arcs spaced at intervals at the periphery of the opening of the cavity, and respectively having an arc length, wherein the arc length of each second convex arc is smaller than that of each first convex arc: and multiple second concave arcs spaced at intervals at the periphery of the opening of the cavity beside the second convex arcs; and an imaging surface formed around the inner side surface of the cavity, inclining from the first edge to the second edge of the cavity relative to an axis of the cavity, and having a cross sectional edge conforming with the first edge and the second edge of the cavity in shape.