# US 11,909,943 B2 · Food preparation entity > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,909,943 B2 - Document ID: US11909943B2 - Status: Granted - Kind: B2 - Application number: 17/413,190 - Filed: 2019-11-29 - Published: 2022-01-20 - Granted: 2024-02-20 - Earliest claimed: 2018-12-12 - Assignees: Electrolux Appliances Aktiebolag - Applicants: Electrolux Appliances Aktiebolag - Inventors: Christoph Luckhardt; Thorben Schiffler; Kersten Kaiser - Web page: https://patentgrep.com/patent/US11909943B2 ## CPC - H04N 13/239: using two two-dimensional [2D] image sensors having a relative position equal to or related to the interocular distance (H04N13/243 takes precedence) - F24C 7/085: {on baking ovens} - F24C 15/006: {Arrangements for circulation of cooling air} - G06T 7/55: from multiple images - H04N 23/52: Elements optimising image sensor operation, e.g. for electromagnetic interference [EMI] protection or temperature control by heat transfer or cooling elements - H04N 23/57: Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices - F28F 2250/08: Fluid driving means, e.g. pumps, fans - H04N 23/555: {for picking-up images in sites, inaccessible due to their dimensions or hazardous conditions, e.g. endoscopes or borescopes} - H04N 2213/001: Constructional or mechanical details - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION - F24C: DOMESTIC STOVES OR RANGES (exclusively for solid fuels F24B); DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL - F28F: DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION (water and air traps, air venting F16) ## Abstract The invention relates to a food preparation entity comprising a cavity (2) for receiving food (3) to be prepared and at least two cameras (4, 5) for capturing images of the food (3) included in the cavity (2), wherein said cameras (4, 5) are positioned such that images are captured from different points of view, wherein each camera (4, 5) comprises a certain field of view (4.1, 5.1), wherein immediately adjacent fields of view (4.1,5.1) of said cameras (4, 5) at least partially overlap and wherein a processing entity (6) is provided which is configured to calculate three-dimensional information of the food (3) included in the cavity (2) based on the images provided by the cameras (4, 5). ## Claims ### Claim 1 Food preparation entity comprising a cavity for receiving food to be prepared and at least two cameras for capturing images of the food included in the cavity, wherein said cameras are positioned such that images are captured from different points of view, wherein each camera comprises a certain field of view, wherein immediately adjacent fields of view of said cameras at least partially overlap and wherein a processing entity is provided which is configured to calculate three-dimensional information of the food included in the cavity based on the images provided by the cameras, wherein each camera comprises a respective main view axis, wherein an angle (α) between the main view axes of said cameras providing the immediately adjacent fields of view is in a range between 10° and 15°. ### Claim 2 (depends on 1) Food preparation entity according to claim 1, wherein at least one said camera is coupled with cooling means for cooling the at least one said camera. ### Claim 3 (depends on 2) Food preparation entity according to claim 2, wherein the cooling means use air or a cooling liquid as heat transfer medium. ### Claim 4 (depends on 2) Food preparation entity according to claim 2, wherein the cooling means comprise an air duct, a heat pipe or a liquid-based cooling system. ### Claim 5 (depends on 2) Food preparation entity according to claim 2, wherein the cooling means comprise a heat sink provided by a surface portion of the food preparation entity or provided by a heat exchanger. ### Claim 6 (depends on 2) Food preparation entity according to claim 2, wherein the cooling means comprise a heat exchanger operatively coupled with a cooling arrangement of the food preparation entity. ### Claim 7 (depends on 2) Food preparation entity according to claim 2, wherein the cooling means comprise a liquid-based cooling system including a pump, a heat exchanger and a tubing for providing a liquid flow circulation between at least one said camera and the heat exchanger. ### Claim 8 (depends on 1) Food preparation entity according to claim 1, wherein the at least two cameras are included in the cavity. ### Claim 9 (depends on 1) Food preparation entity according to claim 1, wherein at least one said camera is included in the cavity and at least one further said camera is included in a door handle of a door of the food preparation entity. ### Claim 10 (depends on 1) Food preparation entity according to claim 1, wherein the at least two cameras are included in a door handle of a door of the food preparation entity. ### Claim 11 (depends on 1) Food preparation entity according to claim 1, wherein at least one said camera provides a field of view from an interior of the cavity through a door glass of a door of the food preparation entity, and a processing entity is configured to provide gesture control based on the information provided by the at least one said camera. ### Claim 12 (depends on 1) Food preparation entity according to claim 1, wherein at least one of said cameras provides a field of view from an interior of the cavity through a door glass of a door of the food preparation entity. ### Claim 13 Method for gathering three-dimensional information of food received within a cavity of a food preparation entity based on at least two cameras, the method comprising the steps of: capturing images by the at least two cameras from different points of view, wherein each camera comprises a certain field of view, wherein immediately adjacent fields of view of said cameras at least partially overlap, the at least two cameras comprising respective main view axes, wherein an angle (α) between the main view axes of said cameras providing the immediately adjacent fields of view is in a range between 10° and 15°; calculating three-dimensional information of the food included in the cavity based on the images provided by the cameras. ### Claim 14 (depends on 13) Method according to claim 13, wherein the cameras are cooled by cooling means. ### Claim 15 (depends on 13) Method according to claim 13, wherein at least one of said cameras provides a field of view from an interior of the cavity through a door glass of a door of the food preparation entity. ### Claim 16 Food preparation entity comprising: a cavity for receiving food, an image capturing system adapted to ascertain three-dimensional information concerning food received within the oven cavity, and a camera cooling system; said image capturing system comprising a first camera and a second camera, said first camera having a first field of view aligned along a first main view axis and embracing a location within said cavity for receiving food, said second camera having a second field of view aligned along a second main view axis and embracing said location within said cavity, said first and second cameras being oriented such that said first field of view overlaps said second field of view at said location within the cavity, wherein an angle (α) between the first main view axis and the second main view axis is in a range between 10° and 15°, said first camera being located within said cavity; said camera cooling system being adapted to cool said first camera via either: a heat-transfer fluid comprising at least one of air or a cooling liquid that circulates between the first camera and a heat sink located remote from the first camera, or a conductive heat pipe connected between and in thermal communication with said first camera and said heat sink. ### Claim 17 (depends on 16) Food preparation entity according to claim 16, said second camera being located within said cavity, said camera cooling system adapted to also cool said second camera via either: said heat-transfer fluid circulating between both said first and second cameras and said heat sink, or said conductive heat pipe being connected and in thermal communication with both said first and second cameras and said heat sink, said heat sink comprising a heat exchanger integrated with or as a cooler surface of a housing of the food preparation entity. ### Claim 18 (depends on 16) Food preparation entity according to claim 16, said heat-transfer fluid comprising air, the camera cooling system further comprising a fan adapted to circulate air between said first camera and said heat sink, as well as to an independent processing unit of said food preparation entity in order to also cool the independent processing unit. ### Claim 19 (depends on 16) Food preparation entity according to claim 16, wherein at least one of said first and second cameras provides a field of view from an interior of the cavity through a door glass of a door of the food preparation entity.