LED Bulb

Abstract

An LED bulb includes: a circuit board having opposite first and second surfaces; a plurality of LEDs disposed on the first surface; and a heat dissipating structure having a heat dissipating board, wherein the heat dissipating board has opposite third and fourth surfaces, the third surface is attached to the second surface of the circuit board, and a plurality of heat dissipating bumps is disposed on the fourth surface and gradually decreases in length from the center toward the periphery of the fourth surface to thereby facilitate air convection around the heat dissipating bumps, thus improving the overall heat dissipating efficiency so as to increase the light emitting efficiency and lifetime of the LED bulb.

1 . An LED bulb, comprising:
 a circuit board having a first surface and a second surface opposite to the first surface;   a plurality of LEDs disposed on the first surface of the circuit board; and   a heat dissipating structure having a heat dissipating board, wherein the heat dissipating board has a third surface and a fourth surface opposite to the third surface, the third surface is attached to the second surface of the circuit board, and a plurality of heat dissipating bumps are disposed on the fourth surface;   a cover engaged on top of a housing to form the closed LED bulb, wherein the cover has no opening on the top, wherein the LEDs are positioned upwards and covered by the cover; and   said housing disposed around the circuit board and the heat dissipating structure, wherein the housing has a plurality of openings positioned around the heat dissipating structure in such a way as to draw the heat away from the LEDs on the circuit board through the heat dissipating structure and out of the heat dissipating space through the openings in the housing via air convection in all directions.