Patent ID: 8773643
Filing Date: 2014-07-08
Classification: G01C,G01S

Abstract:
1. An apparatus for sensing a distance from an object, comprising: an emitter emitting a light along an emitting direction toward the object; a first receiver having a first light incident surface, the first receiver being disposed on a side of the emitter and receiving the light reflected from the object to generate a first signal; and a second receiver having a second light incident surface, the second receiver being disposed between the emitter and the first receiver and receiving the light reflected from the object to generate a second signal; wherein the first receiver has a first signal-to-distance curve with a first peak, the second receiver has a second signal-to-distance curve with a second peak, and a distance corresponding to the first peak is larger than a distance corresponding to the second peak; a distance corresponding to an intersection point of the first signal-to-distance curve and the second signal-to-distance curve is a predetermined distance; a first angle is formed between a normal of the first light incident surface of the first receiver and a normal of a light-exiting surface of the emitter, a second angle is formed between a normal of the second light incident surface of the second receiver and the normal of the first light incident surface of the first receiver, and the first angle and the second angle are determined according to the predetermined distance.