# US 10,871,262 B2 · Structured light illumination module > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,871,262 B2 - Document ID: US10871262B2 - Status: Granted - Kind: B2 - Application number: 16/173,009 - Filed: 2018-10-29 - Published: 2019-05-02 - Granted: 2020-12-22 - Earliest claimed: 2017-11-02 - Assignees: Spring Rainbow Optics Co., Ltd - Applicants: Spring Rainbow Optics Co., LTD - Inventors: Po-Liang Chiang; Yu-Teng Jheng - Web page: https://patentgrep.com/patent/US10871262B2 ## CPC - G02B 27/1093: {for use with monochromatic radiation only, e.g. devices for splitting a single laser source} - F21K 9/68: Details of reflectors forming part of the light source - F21V 7/0025: {Combination of two or more reflectors for a single light source (array of reflectors for a cluster of light sources F21V7/0083)} - F21V 7/0091: {using total internal reflection} - F21V 7/04: Optical design - F21V 7/10: Construction - G02B 27/0944: {Diffractive optical elements, e.g. gratings, holograms (gratings per se G02B5/18; holograms used as optical elements per se G02B5/32)} - G02B 27/20: for imaging minute objects, e.g. light-pointer - G02B 27/30: Collimators - H01S 5/005: {Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping (H01S5/026, H01S5/18388 take precedence)} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - F21K: NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL ## Abstract A structured light illumination module is provided and includes a light source including a laser diode and configured for emitting light; an optical element including a light transmissive part which receives light and allows collimated light to pass, and a total internal reflection part, wherein an angle θ between a reflective surface of the total internal reflection part and an optical axis of the optical element is configured for totally internally reflecting a part of the light by the reflective surface; a diffractive component configured for converting the light into a structured light pattern; and an energy recycling mechanism disposed on at least a part of an incident surface or an emergent surface of the optical element. ## Claims ### Claim 1 A structured light illumination module for three dimension sensing, comprising: a light source including a laser diode and configured for emitting light; an optical element including a light transmissive part which receives the light emitted from the light source and allows collimated light emitted from the light source to pass, and a total internal reflection part, wherein an angle θ between a reflective surface of the total internal reflection part and an optical axis of the optical element is configured for totally internally reflecting at least a part of the light emitted from the light source by the reflective surface of the total internal reflection; a structured light diffractive component configured for converting the light emitted from the optical element into a structured light pattern, and spaced apart from the optical element; and an energy recycling mechanism disposed on at least a part of an incident surface of the optical element or at least a part of an emergent surface of the optical element. ### Claim 2 (depends on 1) The structured light illumination module as claimed in claim 1, wherein the angle θ ranges from 7 degree to −18 degree. ### Claim 3 (depends on 1) The structured light illumination module as claimed in claim 1, wherein a part of the light emitted from the light source with a divergence angle being greater than 0 degree and less than or equivalent with 9 degree is totally internally reflected back multiple times by the reflective surface of the total internal reflection part inside the optical element for homogenizing the light emitted from the light source. ### Claim 4 (depends on 1) The structured light illumination module as claimed in claim 1, wherein the optical element is made from plastic material with a refractive index of about 1.5. ### Claim 5 (depends on 1) The structured light illumination module as claimed in claim 1, further comprising a lens assembly disposed between the optical element and the diffractive component, and configured to adjust the light passing through the light transmissive part of the optical element for the diffractive component. ### Claim 6 (depends on 1) The structured light illumination module as claimed in claim 1, an area of the energy recycling mechanism ranges from 0% to 90% of an area of the incident surface of the optical element. ### Claim 7 (depends on 1) The structured light illumination module as claimed in claim 1, wherein the optical element is shaped as a truncated cone, a truncated quadrangular cone, or a cylinder. ### Claim 8 A structured light illumination module for three dimension sensing, comprising: a light source including a laser diode and configured for emitting light; an truncated conical optical element including an incident surface, an emergent surface, and a lateral surface, wherein each of the incident surface and the emergent surface has a light transmissive zone which receives the light emitted from the light source and allows collimated light emitted from the light source to pass, and an angle θ between the lateral surface and an optical axis of the optical element is configured for totally internally reflecting at least a part of the light emitted from the light source by the lateral surface; a structured light diffractive component configured for converting the light emitted from the optical element into a structured light pattern, and spaced apart from the optical element; and an energy recycling mechanism disposed on at least a part of the incident surface of the optical element or at least a part of the emergent surface of the optical element. ### Claim 9 (depends on 8) The structured light illumination module as claimed in claim 8, wherein the angle θ ranges from 7 degree to −18 degree. ### Claim 10 (depends on 8) The structured light illumination module as claimed in claim 8, wherein the part of the light emitted from the light source with a divergence angle being greater than 0 degree and less than or equivalent with 9 degree is reflected back multiple times by the lateral surface inside the optical element for homogenizing the light emitted from the light source. ### Claim 11 (depends on 8) The structured light illumination module as claimed in claim 8, wherein the optical element is made from plastic material with a refractive index of about 1.5. ### Claim 12 (depends on 8) The structured light illumination module as claimed in claim 8, further comprising a lens assembly disposed between the optical element and the diffractive component, and configured to adjust the light passing through the light transmissive zone of the optical element for the diffractive component. ### Claim 13 (depends on 8) The structured light illumination module as claimed in claim 8, wherein an area of the energy recycling mechanism ranges from 0% to 90% of an area of the incident surface of the optical element.