# US 2018/0324318 A1 · Device and method for deflecting a beam of light > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0324318 A1 - Document ID: US20180324318A1 - Status: Published application - Kind: A1 - Application number: 15/773,464 - Filed: 2016-11-02 - Published: 2018-11-08 - Earliest claimed: 2015-11-16 - Assignees: Robert Bosch GmbH - Applicants: Robert Bosch GmbH - Inventors: Dominik Messner; Mohamad Iyad Al Dibs - Web page: https://patentgrep.com/patent/US20180324318A1 ## CPC - H04N 1/0283: {in combination with a light deflecting element, e.g. a rotating mirror} - H04N 1/00997: {Light control, e.g. shielding from ambient light or preventing light leakage} - H04N 1/04: Scanning arrangements {, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa}(H04N1/387 takes precedence) - H04N 1/053: in main scanning direction, e.g. synchronisation of line start or picture elements in a line - H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION ## Abstract A device and a method for deflecting a beam of light. The device is developed together with: an adjustable deflection device; a closed-loop control unit, which is designed to generate an actuating signal by which the deflection device is controlled in a periodic movement for scanning a solid angle region with the aid of a beam of light deflected by the deflection device; and a detector device, which is designed to detect an impingement or a missing impingement of the scanning beam of light on the detector device, and to generate a measuring signal based thereon; the closed-loop control unit furthermore being designed to adapt the actuating signal based on at least the measuring signal. ## Claims ### Claim at position 1 1-10. (canceled) ### Claim 11 A device for deflecting a beam of light, comprising: an adjustable deflection device; a closed-loop control unit designed to generate an actuating signal by which the deflection device is controlled in a periodic movement for scanning a solid angle region with the aid of a beam of light that the beam of light is deflected by the deflection device; and a detector device designed to detect an impingement or a missing impingement of the scanning beam of light on the detector device and to generate a measuring signal on the basis of the detection; wherein the closed-loop control unit is designed to adapt the actuating signal on the basis of at least the measuring signal. ### Claim 12 (depends on 11) The device as recited in claim 11, wherein the detector device is designed to detect the impingement or the missing impingement of the scanning beam of light on the detector device at least once in each period of a periodic movement about a fast axis of rotation of the scanning of the solid angle region. ### Claim 13 (depends on 12) The device as recited in claim 12, wherein the detector device has a first light detector and a second light detector, which are designed to detect the impingement or the missing impingement of the scanning beam of light on the first light detector and the second light detector at least once in each period of the periodic movement about the fast axis of rotation of the scanning of the solid angle region. ### Claim 14 (depends on 11) The device as recited in claim 11, wherein the deflection device is designed for a resonant operation, and the actuating signal, which is adapted based on the measuring signal, is developed in such a way that an amplitude of the periodic movement is increased or decreased based on the measuring signal. ### Claim 15 (depends on 14) The device as recited in claim 14, wherein the closed-loop control unit is designed to increase or decrease an amplitude of the periodic movement at consecutive measuring instants with the aid of the adapted actuating signal, the amplitude being increased if the detector device detects a missing impingement of the scanning beam of light on the detector device; and the amplitude being decreased if the detector device detects an impingement of the scanning beam of light on the detector device. ### Claim 16 (depends on 11) The device as recited in claim 11, wherein the deflection device is designed for a quasi-static operation; and the detector device has a first light detector and a second light detector, the first light detector is designed to detect the impingement or the missing impingement of the scanning beam of light at a location that corresponds to a maximum positive deflection of the deflection device, and to do so exactly once in each period of the periodic movement about a fast axis of rotation of the scanning of the solid angle region, and the second light detector is designed to detect the impingement or the missing impingement of the scanning beam of light at a location that corresponds to a maximum negative deflection of the deflection device, and to do so exactly once in each period of the periodic movement about the fast axis of rotation of the scanning of the solid angle region. ### Claim 17 (depends on 16) The device as recited in claim 16, wherein the closed-loop control unit for generating the actuating signal is controllable by an external reference variable, the device has an interpolation device, which is designed to detect a first value of the reference variable at the instant when the scanning beam of light impinges on the first light detector, and to detect a second value of the reference variable at the instant when the scanning beam of light impinges on the second light detector, the interpolation device further being designed to interpolate further values of the reference variable between the detected first and second values of the reference variable; and wherein the reference variable for the control of the closed-loop control unit is adapted based on the interpolated further values of the reference variable. ### Claim 18 A method for deflecting a beam of light, the method comprising: controlling a deflection device with the aid of a control signal for scanning a solid angle region with the aid of a beam of light, deflected by the deflection device, in a periodic movement; detecting an impingement or a missing impingement of the scanning beam of light on a detector device; generating a measuring signal based on a result of the detection; and adapting the actuating signal based on the measuring signal. ### Claim 19 (depends on 18) The method as recited in claim 18, wherein an amplitude of the periodic movement of the deflection device is increased whenever the detector device detects a missing impingement of the scanning beam of light on the detector device at a multitude of consecutive measuring instants; and the amplitude of the periodic movement of the periodic movement of the deflection device is decreased whenever the detector device detects an impingement of the scanning beam of light on the detector device at one of the multitude of consecutive measuring instants. ### Claim 20 (depends on 18) The method as recited in claim 18, wherein the control of the deflection device takes place as a function of an external reference variable, a first value of the reference variable is detected at an instant when the scanning beam of light impinges on a first light detector, and a second value of the reference variable is detected at an instant when the scanning beam of light impinges on a second light detector; and wherein further values of the reference variable between the detected first and second values of the reference variable are interpolated, and the reference variable is adapted based on the interpolated further values of the reference variable.