Structured light generation device and diffractive optical element thereof

Abstract

A structured light generation device includes a laser light source module and a diffractive optical element. After a non-collimated light beam from the laser light source module is received by a diffraction layer of the diffractive optical element, the non-collimated light beam is modulated as an optical information-bearing light. Since no collimator is between the laser light source module and the diffractive optical element, the spacing distance between the laser light source module and the diffractive optical element is shortened. Consequently, the overall structured light generation device is slim.

What is claimed is: 
     
         1 . A structured light generation device, comprising:
 a laser light source module comprising a light source, wherein the light source emits a non-collimated light beam; and   a diffractive optical element comprising a diffraction layer, wherein after the non-collimated light beam from the laser light source module is received by the diffraction layer, the non-collimated light beam is modulated as an optical information-bearing light,   wherein an optical axis of the light source and the diffractive optical element is non-linear.   
     
     
         2 . The structured light generation device according to  claim 1 , further comprising a reflective mirror, wherein after the non-collimated light beam from the laser light source module is projected to the reflective mirror, the non-collimated light beam is reflected to the diffractive optical element by the reflective mirror. 
     
     
         3 . The structured light generation device according to  claim 2 , wherein there is a first distance between the light source and the reflective mirror along the optical axis, and there is a second distance between the reflective mirror and the diffractive optical element along the optical axis, wherein a total distance of the first distance and the second distance is in a range between 0 mm and 7 mm.