Dimmer for incandesent lamp
AssigneeMarumo Electric Co., Ltd.
InventorsHiroshi Kita, Kenichi Tsuchizaki
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Abstract
A dimmer for an incandescent lamp, wherein a phase angle controlling dimmer for performing one time ignition operation every one period of a power supply waveform is used, the ignition angle is varied continuously to perform an optical adjustment operation, each of the electrical powers of positive half cycle and negative half cycle is supplied to individual filaments of a bulb so as to enable an optical adjustment of less variation in color temperature to be attained.
Claims17
A dimmer for an incandescent lamp having a bulb with two individual filaments, wherein a phase angle controlling dimmer for performing one time ignition operation every one period of a power supply waveform is used, an ignition angle is varied continuously to perform an optical adjustment operation, each of the electrical powers of positive half cycle and negative half cycle is supplied to the two individual filaments respective so as to enable an optical adjustment of less variation in color temperature to be attained.
A dimmer for an incandescent lamp having first and second filaments, wherein there is provided a dimmer capable of individually controlling a positive half cycle and a negative half cycle of an AC power supply voltage, each of the electrical power of the positive half cycle and the electrical power of the negative half cycle is separately supplied to the filaments and, when the first filament reaches the specified color temperature, electrical power for the second filament is started, electrical power to the first filament is further increased to accommodate for reduction in color temperature.
A dimmer for an incandescent lamp having a bulb with individual filaments and an intermediate terminal enclosed therein comprising:
- a phase angle controller for performing one time ignition operation every one period of a power supply waveform is used having positive and negative half cycles, an ignition angle of the waveform is varied continuously to perform an optical adjustment operation, electrical power the positive half cycle and negative half cycle is supplied to respective to exactly the tow individual filaments so as to enable optical adjustment in color temperature with reduced variation to be attained.
Dependencies are inferred from the claim text.