Rotary three-section dimmer switch for carbon-film potentiometer

The invention relates to a rotary three-section dimmer switch for a carbon-film potentiometer. The rotary three-section dimmer switch is characterized by comprising a disc knob (1), wherein a slidingvane (2) is arranged on the knob (1) and is provided with a carbon-foil contact (21) and a copper foil ring contact (22); a PCB (3) is arranged at the lower part of the knob (1); and the PCB (3) is provided with a carbon film (4) and a copper foil ring (5) capable of being in contact with the carbon-foil contact (21) and the copper foil ring contact (22) separately; the carbon film (4) is locatedon the periphery of the copper foil ring (5); and the carbon film (4) comprises a first dimming carbon film section (41), a second dimming carbon film section (42) and a third dimming carbon film section (43). According to the rotary three-section dimmer switch for the carbon-film potentiometer, adjustment of multiband light or fan speed is achieved, and convenience is brought to people's lives. 本发明涉及种旋转式碳膜电位器三段调光开关，其特征在于：