Patent ID: 8106532

Claim:
An illumination device of gradual dimming after power interruption, comprising: a charge control unit, a built-in power storage unit, a gradual-dimming light intensity drive control unit, a switch control unit, and a light emitting source are provided in a lamp body, wherein: the built-in power storage unit is coupled to the charge control unit to be charged by city power therethrough, the switch control unit being coupled to select between city power and the built-in power storage unit for powering the light emitting source; in the case of uninterruption of city power, the switch control unit switches the illumination device to a first mode using city power for driving the light emitting source to emit light stably, the built-in power storage unit being simultaneously charged by the city power through the charge control unit; in the case of city power interruption, the switch control unit responsively switches the illumination device to a second mode using power from the built-in power storage unit for driving the gradual-dimming light intensity drive control unit, a light intensity of the light emitting source being thereafter adjusted and controlled by the gradual-dimming light intensity drive control unit such that the light emitting source is progressively reduced in light intensity to be gradually turned off.