# US 2019/0320160 A1 · Three dimensional scan system that can increase the effective scan depth > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0320160 A1 - Document ID: US20190320160A1 - Status: Published application - Kind: A1 - Application number: 16/365,701 - Filed: 2019-03-27 - Published: 2019-10-17 - Earliest claimed: 2018-04-17 - Assignees: Qisda Corporation - Applicants: Qisda Corporation - Inventors: Ching-Huey Wang; Ming-Kuen Lin; Tsung-Hsun Wu - Web page: https://patentgrep.com/patent/US20190320160A1 ## CPC - G01B 11/25: by projecting a pattern, e.g. {one or more lines,} moiré fringes on the object (G01B11/255 takes precedence {; image analysis for depth or shape recovery G06T7/50}) - H04N 13/254: in combination with electromagnetic radiation sources for illuminating objects - G01B 11/2518: {Projection by scanning of the object} - G03B 21/142: {Adjusting of projection optics} - G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) ## Abstract A three dimensional scan system includes a projection device, an image capturing module and an image formation device. The projection device includes a lighting module for providing a light beam, and a pattern generator for receiving the light beam and project a predetermined pattern. The image capturing module is used to capture images. The image formation device is used to form a projected pattern by projecting the predetermined pattern onto an object, and to project an image of the object and the projected pattern to the image capturing module. An optimal image formation focal plane of the image formation device for forming the predetermined pattern is different from an optimal image capturing focal plane of the image formation device for projecting the projected pattern. ## Claims ### Claim 1 A three dimensional scan system comprising: a projection device comprising: a lighting module configured to provide a light beam; and a pattern generator configured to receive the light beam and project a predetermined pattern; an image capturing module configured to capture images; and an image formation device configured to form a projected pattern by projecting the predetermined pattern onto an object, and to project an image of the object and the projected pattern to the image capturing module; wherein an optimal image formation focal plane of the image formation device for forming the predetermined pattern is different from an optimal image capturing focal plane of the image formation device for projecting the projected pattern. ### Claim 2 (depends on 1) The three dimensional scan system of claim 1, wherein a distance between the optimal image formation focal plane and a predetermined scan center of the three dimensional system is greater than a distance between the optimal image capturing focal plane and the predetermined scan center. ### Claim 3 (depends on 2) The three dimensional scan system of claim 2, wherein the predetermined scan center is substantially on the optimal image capturing focal plane. ### Claim 4 (depends on 1) The three dimensional scan system of claim 1, wherein an F-number for the projection device and the image formation device to project the predetermined pattern is greater than or equal to an F-number for the image capturing module and the image formation device to capture the projected pattern. ### Claim 5 (depends on 1) The three dimensional scan system of claim 1, wherein a resolution for projecting an image by the projection device and the image formation device is less than or equal to a resolution for capturing an image by the image formation device and the image capturing module. ### Claim 6 (depends on 1) The three dimensional scan system of claim 1, wherein the image formation device comprises: an image projection formation module configured to project the predetermined pattern on the object; an image capturing formation module configured to project the projected pattern on the image capturing module; wherein the image projection formation module and the image capturing formation module have different optical axes. ### Claim 7 (depends on 6) The three dimensional scan system of claim 6 further comprising an adjustment gear, wherein the pattern generator is bearing on the adjustment gear and the adjustment gear is configured to adjust a distance between the pattern generator and the image projection formation module for adjusting a position of the optimal image formation focal plane. ### Claim 8 (depends on 7) The three dimensional scan system of claim 7, wherein the adjustment gear comprises a position bearing element and at least a washer. ### Claim 9 (depends on 7) The three dimensional scan system of claim 7, wherein the adjustment gear comprises a rotatable screw. ### Claim 10 (depends on 1) The three dimensional scan system of claim 1, wherein the image formation device comprises: alight splitting module configured to separate a projection path of the predetermined pattern onto the object and a projection path of the projected pattern onto the image capturing module; a lens module configured to propagate the predetermined pattern and the projected pattern. ### Claim 11 (depends on 10) The three dimensional scan system of claim 10 comprising an adjustment gear wherein the pattern generator is bearing on the adjustment gear and the adjustment gear is configured to adjust a distance between the pattern generator and the lens module for adjusting a position of the optimal image formation focal plane. ### Claim 12 (depends on 11) The three dimensional scan system of claim 11, wherein the adjustment gear comprises a position bearing element and at least a washer. ### Claim 13 (depends on 11) The three dimensional scan system of claim 11, wherein the adjustment gear comprises at least a rotatable screw. ### Claim 14 (depends on 1) The three dimensional scan system of claim 1, wherein the optimal image formation focal plane and the optimal image capturing focal plane are in parallel.