Structured light generation device and diffractive optical element thereof
AssigneeAhead Optoelectronics, Inc.
InventorsJyh-Long Chern, Chih-Ming Yen
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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.
Claims38
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;
- 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;
- and
- a non-air medium filled between the light source and the diffractive optical element, wherein the non-collimated light beam is transmitted through the non-air medium,
- wherein the structured light generation device satisfies at least one of mathematical relationships (1) and (2):
- W
- d
- ≥
- φ
- 2
- ·
- tan
-
-
- θ
- ,
- (
- 1
- )
- 1
-
-
- mm
- <
- W
- d
- <
- 7
-
-
- mm
- (
- 2
- )
- wherein θ is a half angle of beam diffusion of the non-collimated light beam, φ is a beam diameter of the non-collimated light beam when projected to the diffraction layer, and Wd is a working distance between the light source and the diffraction layer.
A diffractive optical element, comprising:
- a light-transmissible substrate;
- and
- a diffraction layer disposed on the light-transmissible substrate, wherein after a non-collimated light beam from a light source is received by the diffraction layer, the non-collimated light beam is modulated as an optical information-bearing light, wherein the diffractive optical element satisfies at least one of mathematical relationships (1) and (2):
- W
- d
- ≥
- φ
- 2
- ·
- tan
-
-
- θ
- ,
- (
- 1
- )
- 1
-
-
- mm
- <
- W
- d
- <
- 7
-
-
- mm
- (
- 2
- )
- wherein θ is a half angle of beam diffusion of the non-collimated light beam, φ is a beam diameter of the non-collimated light beam when projected to the diffraction layer, and Wd is a working distance between the light source and the diffraction layer,
- wherein a non-air medium is filled between the light source and the diffractive optical element, wherein the non-collimated light beam is transmitted through the non-air medium.
Dependencies are inferred from the claim text.