Patent ID: 8064048

Claim:
A particle-moving type orientation sensor, comprising: a housing having an accommodating space having four zones, a first zone, a second zone, a third zone, and a fourth zone, which are circularly arranged and connecting with each other, a first opening formed on the housing and connecting to the first zone, two second openings formed on the housing and respectively connecting to the second zone and the fourth zone; at least one light emitter arranged at the first opening and emitting light into the accommodating space through the first opening; two light receivers respectively arranged at the second openings and receiving light from the accommodating space through the second openings; and a plurality of particles arranged in the accommodating space, whereby while the particle-moving type orientation sensor is tilting, the particles move toward the direction of gravity force, a portion of light emitted from the light emitter is blocked by the particles, and one of the light receiver is partially blocked by the particles, the light receivers respectively receive light with predetermined intensities and correspondingly output electric signals with predetermined strengths.