Patent ID: 8256124

Claim:
A tilt sensor, comprising: a multi-layer circuit board comprising: a first layer board; and a second layer board disposed on the first layer board, the second layer board having a first holding space, a second holding space, and a third holding space each of which exposing a respective portion of the first layer board; a holder disposed on the second layer board and covering the first holding space, the second holding space, and the third holding space, the holder having a containing recess connecting the first holding space, the second holding space, and the third holding space, a bottom surface of the containing recess being a reflective surface; a first light-sensing component disposed on the first layer board and in the first holding space; a second light-sensing component disposed on the first layer board and in the second holding space; a light-emitting component, disposed on the first layer board and in the third holding space, that emits a light beam toward the bottom surface of the containing recess; and a movable component disposed in the containing recess of the holder such that the movable component moves in a given direction when the tilt sensor tilts in the given direction to either block the light beam emitted by the light-emitting component or cause the light beam to be reflected by the bottom surface of the containing recess to be sensed by at least one of the first light-sensing component and the second light-sensing component.