# US 12,759,052 B2 · Three-dimensional additive manufacturing device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,759,052 B2 - Document ID: US12759052B2 - Status: Granted - Kind: B2 - Application number: 18/563,047 - Filed: 2022-06-27 - Published: 2024-08-08 - Granted: 2026-10-13 - Earliest claimed: 2021-07-16 - Assignees: Mitsubishi Heavy Industries, Ltd. - Applicants: Mitsubishi Heavy Industries, Ltd. - Inventors: Ryuichi Narita; Takayuki Moritake; Akemi Takano; Toshiya Watanabe - Web page: https://patentgrep.com/patent/US12759052B2 ## CPC - B22F 12/90: Means for process control, e.g. cameras or sensors - B22F 10/28: Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] - B22F 12/49: Scanners - B33Y 30/00: Apparatus for additive manufacturing; Details thereof or accessories therefor - B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER - B33Y: ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING ## Abstract A three-dimensional additive manufacturing device, which performs additive manufacturing by irradiating, with a beam, a powder bed laid on a build surface area, includes a projection unit that is configured to project a pattern in which there is a luminance distribution in the build surface area and the luminance distribution changes over time, an imaging unit configured to image the pattern projected onto the build surface area, and a reflective part configured to reflect at least one among a first light beam projected by the projection unit and a second light beam captured by the imaging unit. The projection and imaging units are disposed outside the chamber where the additive manufacturing is performed on the build surface area. The reflective part is accommodated inside the chamber. The first and second light beams pass through one first window portion installed on the chamber. ## Claims ### Claim 1 A three-dimensional additive manufacturing device that irradiates a powder bed laid in a build surface area with a beam to perform additive manufacturing, the three-dimensional additive manufacturing device comprising: a projection part that is configured to project a pattern in which there is a luminance distribution in the build surface area and the luminance distribution changes over time; an imaging part that is configured to image the pattern projected on the build surface area; and a reflective part that is configured to reflect at least any one of a first light beam projected by the projection part or a second light beam captured by the imaging part, wherein the projection part and the imaging part are disposed outside a chamber in which the additive manufacturing is performed on the build surface area, the reflective part is attached to a side wall or a side portion of the chamber, the first light beam and the second light beam are able to pass through one first window portion installed in the chamber, and the reflective part includes a reflective surface that is a curved surface. ### Claim 2 (depends on 1) The three-dimensional additive manufacturing device according to claim 1, wherein the reflective part is configured to reflect the second light beam without reflecting the first light beam. ### Claim 3 (depends on 1) The three-dimensional additive manufacturing device according to claim 1, wherein the reflective part is configured to reflect the first light beam without reflecting the second light beam. ### Claim 4 (depends on 1) The three-dimensional additive manufacturing device according to claim 1, wherein the reflective part includes: a first reflective part configured to reflect the first light beam; and a second reflective part, which is different from the first reflective part, configured to reflect the second light beam. ### Claim 5 (depends on 1) The three-dimensional additive manufacturing device according to claim 1, wherein the projection part and the imaging part are disposed above the chamber, the first light beam and the second light beam are able to pass through the first window portion installed on an upper portion of the chamber, and the reflective part is attached to a side wall of the chamber. ### Claim 6 (depends on 1) The three-dimensional additive manufacturing device according to claim 1, wherein the projection part and the imaging part are disposed on a side of the chamber, and the first light beam and the second light beam are able to pass through the first window portion installed on a side portion of the chamber. ### Claim 7 (depends on 1) The three-dimensional additive manufacturing device according to claim 1, further comprising: a first irradiation part that is capable of emitting the beam and is disposed outside the chamber; and a second irradiation part that is capable of emitting the beam and is disposed outside the chamber, which is different from the first irradiation part, wherein the beam emitted from the first irradiation part is able to pass through a second window portion installed in the chamber, which is different from the first window portion, and the beam emitted from the second irradiation part is able to pass through a third window portion installed in the chamber, which is different from the first window portion and the second window portion. ### Claim 8 A three-dimensional additive manufacturing device that irradiates a powder bed laid in a build surface area with a beam to perform additive manufacturing, the three-dimensional additive manufacturing device comprising: a projection part that is configured to project a pattern in which there is a luminance distribution in the build surface area and the luminance distribution changes over time; an imaging part that is configured to image the pattern projected on the build surface area; and a reflective part that is configured to reflect at least any one of a first light beam projected by the projection part or a second light beam captured by the imaging part, wherein the projection part and the imaging part are disposed outside a chamber in which the additive manufacturing is performed on the build surface area, the reflective part is accommodated in the chamber, the first light beam and the second light beam are able to pass through one first window portion installed in the chamber, the projection part and the imaging part are disposed above the chamber, the first light beam and the second light beam are able to pass through the first window portion installed on an upper portion of the chamber, and the reflective part is attached to a side wall of the chamber. ### Claim 9 (depends on 8) The three-dimensional additive manufacturing device according to claim 8, wherein the reflective part is configured to reflect the second light beam without reflecting the first light beam. ### Claim 10 (depends on 8) The three-dimensional additive manufacturing device according to claim 8, wherein the reflective part is configured to reflect the first light beam without reflecting the second light beam. ### Claim 11 (depends on 8) The three-dimensional additive manufacturing device according to claim 8, wherein the reflective part includes: a first reflective part configured to reflect the first light beam; and a second reflective part, which is different from the first reflective part, configured to reflect the second light beam. ### Claim 12 (depends on 8) The three-dimensional additive manufacturing device according to claim 8, wherein the reflective part includes a reflective surface that is a flat surface. ### Claim 13 (depends on 8) The three-dimensional additive manufacturing device according to claim 8, wherein the reflective part includes a reflective surface that is a curved surface. ### Claim 14 (depends on 8) The three-dimensional additive manufacturing device according to claim 8, further comprising: a first irradiation part that is capable of emitting the beam and is disposed outside the chamber; and a second irradiation part that is capable of emitting the beam and is disposed outside the chamber, which is different from the first irradiation part, wherein the beam emitted from the first irradiation part is able to pass through a second window portion installed in the chamber, which is different from the first window portion, and the beam emitted from the second irradiation part is able to pass through a third window portion installed in the chamber, which is different from the first window portion and the second window portion.