LED BULB

摘要

An LED light bulb has LEDs (32) mounted on a tubular carrier (22) with open ends. The tube (22) functions as a chimney to promote cooling by creating convection currents through the chimney. The cooling can be entirely passive or it may be active by incorporating a fan (50).

主权项

1. An LED light bulb comprising:
a base which includes an electrical connector; a light emitting bulb part connected to the base and comprising a sealed enclosure having an outer envelope; a driver circuit electrically connected to the electrical connector; and a set of LEDs electrically connected to the driver circuit, wherein the LEDs are around a hollow tube which is located within the sealed enclosure, wherein the tube comprises a circuit board further comprising a series of sections with fold regions between adjacent sections, said circuit board having a first end region on which discrete LEDs are mounted and a second end free of LEDs, wherein the first end region is shaped to define an outer tube, and the second end region is shaped to define an inner heat sink portion within the outer tube, said inner heat sink portion and said outer tube having open ends and thereby defining a flow passageway through the inner heat sink portion and the outer tube directed towards the outer envelope.