Patent ID: 7791015

Claim:
A motion-detecting module for combining a light-emitting function and a light-sensing function together, comprising: a chip unit having a PCB (Printed Circuit Board), a light-emitting chip, and an image-sensing chip, wherein both the light-emitting chip and the image-sensing chip are electrically disposed on the PCB; a cover unit covering the light-emitting chip and the image-sensing chip, wherein the cover unit has a receiving space for communicating the light-emitting chip and the image-sensing chip, a first opening for exposing the light-emitting chip, and a second opening for exposing the image-sensing chip; and a singular light-guiding unit disposed under the cover unit, wherein the light-guiding unit at least has a first refraction surface, a second refraction surface, a third refraction surface, a fourth refraction surface, and a flat reflection surface, wherein the light-guiding unit has a plurality of positioning elements, and the light-guiding unit is fixed under the cover unit by the positioning elements; wherein, beams projected from the light-emitting chip pass through the first refraction surface, the flat reflection surface and the second refraction surface to form first reflected beams that project onto a surface, wherein all of said beams impinging on said flat reflection surface are reflected to said second refraction surface; and the first reflected beams are reflected by the surface to form second reflected beams that pass through the third refraction surface and the fourth refraction surface and project onto the image-sensing chip; wherein said beams projected from the light-emitting chip undergo only one reflection within said singular light-guiding unit; wherein the cover unit has a top cover body extended upwardly from an external edge thereof in order to cover the light-emitting chip and the image-sensing chip and a bottom cover body extended downwardly from the external edge thereof in order to surround the light-guiding unit.