Patent ID: 8158925

Claim:
A rotor type orientation sensor, comprising: a housing having a circular tunnel and a plurality of first openings connecting to the tunnel and two second openings respectively located on two sides of the first openings and connecting to the tunnel; a plurality of light emitters respectively arranged at the first openings and emitting light into the tunnel through the first openings; two light receivers respectively arranged at the second openings and receiving light from the tunnel through the second openings; and a rotor arranged in the tunnel and being rotatable along the extension direction of the tunnel, whereby while the rotor type orientation sensor is tilted, the rotor rotates toward the direction of gravity force, at least a portion of light emitted from the light emitters is blocked by the rotor and is not able to pass into the tunnel, one of the light receivers is blocked by the rotor and is not able to receive light from the tunnel, the light receivers can respectively receive light with predetermined intensities and correspondingly output electric signals with predetermined strength.