# US 10,309,600 B2 · Daylight transmission system for building > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,309,600 B2 - Document ID: US10309600B2 - Status: Granted - Kind: B2 - Application number: 15/551,719 - Filed: 2016-02-16 - Published: 2018-05-31 - Granted: 2019-06-04 - Earliest claimed: 2015-02-17 - Assignees: Xiaodong Zhang - Applicants: Xiaodong Zhang - Inventors: Xiaodong Zhang - Web page: https://patentgrep.com/patent/US10309600B2 ## CPC - F21S 11/005: {with tracking means for following the position of the sun} - F21S 11/00: Non-electric lighting devices or systems using daylight {(hybrid lighting devices combining artificial and natural light F21S19/00; roofs with sky-light opening E04D13/03; sun blinds for windows with means for redirecting light onto ceiling of a room E06B9/00; solar heat collectors F24S)} - F21S 11/007: {characterised by the means for transmitting light into the interior of a building} - F21V 7/0033: {with successive reflections from one reflector to the next or following} - F21V 7/04: Optical design - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR ## Abstract A daylight transmission system that can be used in buildings, the system including: dual-axis implementation device, CPU-controller, light position sensor and optical components that include moving and fixed optical components; with the moving optical components including optical light collector and the fixed optical components including first receiver and consecutive receivers. The invented system transmits sunlight in a form of parallel light after it is concentrated and therefore does not rely on expensive medium such as optic fibers, with the entire process being efficient in light transmission and economically viable. With the help of a tracking device, sunlight of any incident angle will be reflected in a fixed direction and to a fixed point where the light is reflected further on to the desired destination inside of a building. The invented system can be installed directly onto the external wall of any building, and be applied within a wide range of buildings. ## Claims ### Claim 1 A daylight transmission system for buildings, comprising a dual-axis implementation device, a CPU-controller, a light position sensor and optical components; wherein the optical components include moving and fixed optical components; wherein the moving optical components includes an optical light collector and wherein the fixed optical components including a first receiver and one or more subsequent receiver, wherein the dual-axis implementation device includes: a main shaft, a main motor and its affiliated drive device, a secondary shaft, a secondary motor and its affiliated drive device, and further wherein the light position sensor is provided between the optical light collector and the first receiver, and the main shaft is tilted towards the true north or south; wherein an angle P between the normal vector of the light position sensor and a plane of the optical light collector, an angle T between the axis line of the main shaft and the vertical line perpendicular to the horizontal plane, a Solar Altitude α and a Solar Latitude B are configured to follow the following mathematical relationship: P = 45 ⁢ ° + arc ⁢ ⁢ t ⁡ [ ( sin ⁢ ⁢ T + K ⁢ ⁢ cos ⁢ ⁢ T ) / ( cos ⁢ ⁢ T - K ⁢ ⁢ sin ⁢ ⁢ T ) 2 + L 2 ] 2 in which: unit is degree; L=tan(B−180°); and K=(tan α)×√{square root over (1+[tan(B−180°)]2)}. ### Claim 2 (depends on 1) The daylight transmission system of claim 1, wherein the optical light collector is installed on the secondary shaft. ### Claim 3 (depends on 2) The daylight transmission system of claim 2, wherein the dual-axis implementation device adjusts the status of the system through combined movements of the main shaft and secondary shaft; and the main shaft and secondary shaft intersect each other perpendicularly with their intersection point being fixed in its position any time during the operation of the system. ### Claim 4 (depends on 3) The daylight transmission system of claim 3, wherein the intersection point of the main shaft and the secondary shaft coincides with the rotating center of the optical light collector. ### Claim 5 (depends on 1) The daylight transmission system of claim 1, wherein the dual-axis implementation device drives the optical light collector and makes it rotate around its own central point, wherein the physical location of the central point is kept unchanged in space. ### Claim 6 (depends on 5) The daylight transmission system of claim 5, wherein the dual-axis implementation device adjusts the status of the system through combined movements of the main shaft and secondary shaft; and the main shaft and secondary shaft intersect each other perpendicularly with their intersection point being fixed in its position any time during the operation of the system. ### Claim 7 (depends on 6) The daylight transmission system of claim 6, wherein the intersection point of the main shaft and the secondary shaft coincides with the rotating center of the optical light collector. ### Claim 8 (depends on 1) The daylight transmission system of claim 1, wherein the light position sensor is configured to be installed between any two optical components and the normal vector of a plane where the light position sensor lies is parallel to the line linking the central points of the two optical components. ### Claim 9 (depends on 8) The daylight transmission system of claim 8, wherein the light position sensor is provided between the optical light collector and the first receiver and allocated on the sensor plane and within the range defined by the maximum projection area of the optical light collector projecting on the sensor plane; wherein the projection area of the optical light collector on the sensor plane is partially or completed covered by the projection area of the first receiver on the sensor plane. ### Claim 10 (depends on 8) The daylight transmission system of claim 8, wherein the light position sensor is provided between any two optical components, and the main shaft is tilted towards the true north or south; wherein any optical component located between the optical light collector and the light position sensor is capable of reflecting light; wherein the projection areas of the two optical components adjacent to the light position sensor on the sensor plane where the light position sensor lies are totally or partially overlapped; and wherein the light position sensor is located within the projected area on the sensor plane made by the optical component that reflects light to the light position sensor. ### Claim 11 (depends on 1) The daylight transmission system of claim 1, wherein the light position sensor is configured as such that its back is facing toward the sky, so that it can receive the sunlight reflected from the optical components. ### Claim 12 (depends on 1) The daylight transmission system of claim 1, wherein the dual-axis implementation device adjusts the status of the system through combined movements of the main shaft and secondary shaft; and the main shaft and secondary shaft intersect each other perpendicularly with their intersection point being fixed in its position any time during the operation of the system. ### Claim 13 (depends on 12) The daylight transmission system of claim 12, wherein the intersection point of the main shaft and the secondary shaft coincides with the rotating center of the optical light collector. ### Claim 14 (depends on 1) The daylight transmission system of claim 1, wherein the optical light collector is an optical device that can reflect or refract light. ### Claim 15 (depends on 14) The daylight transmission system of claim 14, wherein the optical light collector is a flat mirror, a curved mirror, a prism, a lens, or a combination thereof. ### Claim 16 (depends on 1) The daylight transmission system of claim 1, wherein the first receiver is an optical device that can concentrate, diffuse, reflect or refract light. ### Claim 17 (depends on 16) The daylight transmission system of claim 16, wherein the first receiver is a lens, a flat mirror, a paraboloid concentrator, a curved mirror, a prism, and/or their combinations. ### Claim 18 (depends on 1) The daylight transmission system of claim 1, wherein the subsequent receivers are optical devices that can reflect, diffuse or refract light. ### Claim 19 (depends on 18) The daylight transmission system of claim 18, wherein the subsequent receivers are flat mirrors, curved mirrors, prisms, lenses and/or their combinations. ### Claim 20 (depends on 1) The daylight transmission system of claim 1, wherein the dual-axis implementation device is closed-cycle-controlled by the CPU-controller which thus adjusts the status of the dual-axis implementation device in real time. ### Claim 21 (depends on 1) The daylight transmission system of claim 1, wherein the light position sensor is provided between the optical light collector and the first receiver and allocated on the sensor plane and within the range defined by the maximum projection area of the optical light collector projecting on the sensor plane; wherein the projection area of the optical light collector on the sensor plane is partially or completed covered by the projection area of the first receiver on the sensor plane. ### Claim 22 (depends on 1) The daylight transmission system of claim 1, wherein the light position sensor is provided between any two optical components, and the main shaft is tilted towards the true north or south; wherein any optical component located between the optical light collector and the light position sensor is capable of reflecting light; wherein the projection areas of the two optical components adjacent to the light position sensor on the sensor plane where the light position sensor lies are totally or partially overlapped; and wherein the light position sensor is located within the projected area on the sensor plane made by the optical component that reflects light to the light position sensor. ### Claim 23 A daylight transmission system for buildings, comprising a dual-axis implementation device, a CPU-controller, a light position sensor and optical components; wherein the optical components include moving and fixed optical components; wherein the moving optical components includes an optical light collector and wherein the fixed optical components including a first receiver and one or more subsequent receiver, wherein the dual-axis implementation device includes: a main shaft, a main motor and its affiliated drive device, a secondary shaft, a secondary motor and its affiliated drive device, wherein the dual-axis implementation device adjusts the status of the system through combined movements of the main shaft and secondary shaft and the main shaft and secondary shaft intersect each other perpendicularly with their intersection point being fixed in its position any time during the operation of the system, and further comprising letting in a Euclidean space the number of reflective optical components between the light position sensor and the optical light collector be n, and letting the normal vector leaving the light sensitive surface of the light position sensor be i, then: i is converted to a new vector I after i has undergone n times of reflection between the above-mentioned optical components; and the angle Q between the vector I and the plane of the optical light collector, the angle T between the axis line of the main shaft and the vertical line perpendicular to the horizontal plane, the Solar Altitude α and the Solar Latitude B are configured to follow the mathematical relationship given below: Q = 45 ⁢ ° + arc ⁢ ⁢ t ⁡ [ ( sin ⁢ ⁢ T + K ⁢ ⁢ cos ⁢ ⁢ T ) / ( cos ⁢ ⁢ T - K ⁢ ⁢ sin ⁢ ⁢ T ) 2 + L 2 ] 2 in which: unit is degree; L=tan(B−180°); and K=(tan α)×√{square root over (1+[tan(B−180°)]2)}. ### Claim 24 (depends on 23) The daylight transmission system of claim 23, wherein optical light collector is installed on the secondary shaft, and the intersection point of the main shaft and the secondary shaft coincides with the rotating center of the optical light collector. ### Claim 25 A daylight transmission system for buildings, comprising a dual-axis implementation device, a CPU-controller, a light position sensor and optical components; wherein the optical components include moving and fixed optical components; wherein the moving optical components includes an optical light collector and wherein the fixed optical components including a first receiver and one or more subsequent receiver, wherein the light position sensor is configured to be installed between any two optical components and the normal vector of a plane where the light position sensor lies is parallel to the line linking the central points of the two optical components, and further wherein the light position sensor is provided between the optical light collector and the first receiver, and the main shaft is tilted towards the true north or south; wherein an angle P between the normal vector of the light position sensor and a plane of the optical light collector, an angle T between the axis line of the main shaft and the vertical line perpendicular to the horizontal plane, a Solar Altitude α and a Solar Latitude B are configured to follow the following mathematical relationship: P = 45 ⁢ ° + arc ⁢ ⁢ t ⁡ [ ( sin ⁢ ⁢ T + K ⁢ ⁢ cos ⁢ ⁢ T ) / ( cos ⁢ ⁢ T - K ⁢ ⁢ sin ⁢ ⁢ T ) 2 + L 2 ] 2 in which: unit is degree; L=tan(B−180°); and K=(tan α)×√{square root over (1+[tan(B−180°)]2)}. ### Claim 26 A daylight transmission system for buildings, comprising a dual-axis implementation device, a CPU-controller, a light position sensor and optical components; wherein the optical components include moving and fixed optical components; wherein the moving optical components includes an optical light collector and wherein the fixed optical components including a first receiver and one or more subsequent receiver, wherein the light position sensor is configured to be installed between any two optical components and the normal vector of a plane where the light position sensor lies is parallel to the line linking the central points of the two optical components, further comprising letting in a Euclidean space the number of reflective optical components between the light position sensor and the optical light collector be n, and letting the normal vector leaving the light sensitive surface of the light position sensor be i, then: i is converted to a new vector I after i has undergone n times of reflection between the above-mentioned optical components; and the angle Q between the vector I and the plane of the optical light collector, the angle T between the axis line of the main shaft and the vertical line perpendicular to the horizontal plane, the Solar Altitude α and the Solar Latitude B are configured to follow the mathematical relationship given below: Q = 45 ⁢ ° + arc ⁢ ⁢ t ⁡ [ ( sin ⁢ ⁢ T + K ⁢ ⁢ cos ⁢ ⁢ T ) / ( cos ⁢ ⁢ T - K ⁢ ⁢ sin ⁢ ⁢ T ) 2 + L 2 ] 2 in which: unit is degree; L=tan(B−180°); and K=(tan α)×√{square root over (1+[tan(B−180°)]2)}.