# US 7,349,074 B2 · Laser scanning and sensing device for detection around automatic doors > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,349,074 B2 - Document ID: US7349074B2 - Status: Granted - Kind: B2 - Application number: 11/186,555 - Filed: 2005-07-21 - Published: 2006-08-03 - Granted: 2008-03-25 - Earliest claimed: 2004-07-22 - Assignees: Bea SA - Inventors: Alain Zambon - Web page: https://patentgrep.com/patent/US7349074B2 ## CPC - G01S 7/4817: {relating to scanning} - E05F 15/43: responsive to disruption of energy beams, e.g. light or sound - E05F 15/608: for revolving wings - E05F 15/74: using photoelectric cells - G01S 7/481: Constructional features, e.g. arrangements of optical elements - G01S 17/04: Systems determining the presence of a target - G01S 17/42: Simultaneous measurement of distance and other co-ordinates (indirect measurement G01S17/46) - G01S 17/87: Combinations of systems using electromagnetic waves other than radio waves - G01S 17/88: Lidar systems specially adapted for specific applications - E05F 15/73: responsive to movement or presence of persons or objects - E05Y 2900/132: Doors - G01S 7/4813: {Housing arrangements} - G01S 17/18: wherein range gates are used - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - E05F: DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING - E05Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF ## Abstract The present invention relates to a light scanner device (10) for measuring a range and an angular direction of a target object (56), the device (10) comprising a pulsed source (12) adapted to transmit light pulses, a transmitter deflection means (20) adapted to reflect and sweep the transmitted light pulses in variable sweep directions across a sweep sector in a sweep plane (15), a photodetection means (42) adapted to detect received light pulses that have been reflected in the sweep plane (15), a receiver deflection means (24) adapted to reflect light pulses that have been reflected in the sweep plane (15) and to re-direct the reflected light pulses to the photodetection means (42). The device comprises optical shielding means (32) adapted to optically shield transmitted light pulses on their trajectory from the pulse source (12) to the transmitter deflection means (20) and at least a portion of their trajectory extending from the transmitter deflection means (20) into the sweep sector from reflected light pulses on their trajectory between the photodetection means (42) and the receiver deflection means (24) and at least a portion of their trajectory extending in the sweep sector and ending on the receiver deflection means (24). ## Claims ### Claim 1 A light scanner device (10) for measuring a range and an angular direction of a target object (56), the device (10) comprising: a pulse source (12) adapted to transmit light pulses, a transmitter deflection means (20) adapted to sweep the transmitted light pulses in variable sweep directions across a sweep sector, a photodetection means (42) adapted to detect received light pulses that have been reflected in the sweep sector, a receiver deflection means (24) adapted to re-direct light pulses that have been reflected in the sweep plane (15) to the photodetection means (42), further comprising optical shielding means (32) adapted to optically shield transmitted light pulses on their trajectory from the pulse source (12) to the transmitter deflection means (20) and at least a portion of their trajectory extending from the transmitter deflection means (20) into the sweep sector from reflected light pulses on their trajectory between the photodetection means (42) and the receiver deflection means (24) and at least a portion of their trajectory extending in the sweep sector and ending on the receiver deflection means (24), wherein the transmitter deflection means (20) and the receiver deflection means (24) both comprise a multi-facet mirror comprising a plurality of facets, with at least one pair of facets substantially parallel to each other, and wherein the multi-facet mirror of the transmitter deflection means (20) and the multi-facet mirror of the receiver deflection means (24) are adapted to be rotated in synchronism with each other on a common rotation axis (38), wherein the multi-facet mirror of the transmitter deflection means (20) and the multi-facet mirror of the receiver deflection means (24) form a split multi-facet mirror comprising a groove adapted to optically separate the multi-facet mirror of the transmitter deflection means (20) and the multi-facet mirror of the receiver deflection means (24). ### Claim 2 (depends on 1) The device according to claim 1, further comprising a casing (18) adapted to accommodate at least the pulse source (12), the transmitter deflection means (20), the receiver deflection means (24), the photodetection means (42) and the optical shielding means (32), whereby the optical shielding means (32) shields transmitted pulses from received pulses on at least their whole trajectory portions located within the casing (18). ### Claim 3 (depends on 1) The device according to claim 1, wherein the optical shielding means (32) extends into said groove between the multi-facet mirror of the transmitter mirror facet means (20) and the multi-facet mirror of the receiver deflection means (24). ### Claim 4 (depends on 1) The device according to claim 1, wherein the receiver deflection means (24) comprises a stationary mirror adapted to receive light pulses reflected in the sweep plane (15). ### Claim 5 (depends on 4) The device according to claim 4, wherein the receiver deflection means (24) comprises a planar, spherical or cylindrical mirror portion. ### Claim 6 (depends on 1) The device according to claim 1, wherein the pulse source is a pulsed laser or a pulsed laser diode. ### Claim 7 (depends on 1) The device according to claim 1, wherein the photodetection means (42) comprises a high gain, high speed photodetector such as an avalanche photodiode. ### Claim 8 (depends on 1) The device according to claim 1, wherein the transmitter deflection means (20) and the receiver deflection means (24) include an axis of rotation and wherein said 4 facets are tilted enabling different sweep sectors according to different tilt angles of the 4 facets of the mirror. ### Claim 9 (depends on 1) The device according to claim 1, wherein the transmitter deflection means (20) and the receiver deflection means (24) include an axis of rotation and wherein said 4 facets each include a tilt angle and wherein the sweep sector is variable between subsequent sweeps by an incremental tilt angle. ### Claim 10 (depends on 1) The device according to claim 1 having a detection range (50) which is variably controllable by an electronic windowing technique. ### Claim 11 (depends on 1) The device according to claim 1, wherein the light pulses transmitted from the pulse source (12) form a beam (14) that is separated and substantially parallel to a beam (22) formed by light pulses that have been reflected in the sweep sector and that have been re-directed by the receiver deflection means (24) to the photodetection means (42). ### Claim 12 (depends on 1) The device according to claim 1, further comprising a transmitter lens (16) adapted to form of transmitted light pulses a transmitted beam (14). ### Claim 13 (depends on 1) The device according to claim 1, further comprising a receiver lens (40) adapted to focus to the photodetection means (42) a received beam (22) of light pulses that have been re-directed by the receiver deflection means (24). ### Claim 14 (depends on 1) The device according to claim 1, further comprising a reflector means (30) adapted to reflect the beam (14) of transmitted pulses onto the photodetection means (42) at instances when the transmitted pulses are not re-directed into the sweep sector by the transmitter deflection means (20), so as to allow measuring a known detection range as a reference for the light scanner device. ### Claim 15 (depends on 14) The device according to claim 14, wherein the reflector means (30) is a retro-reflector or a light pipe adapted to reverse a traveling direction of the pulses transmitted by the pulse source (12). ### Claim 16 (depends on 1) A door sensor system (90) for detecting a target object (56) in and/or near a door comprising a door opening (96), and at least one movable door element (76; 76-1, 76-2, 76-3, 76-4), the system comprising at least one light scanner device (10) according to claim 1. ### Claim 17 (depends on 16) A door sensor system according to claim 16, wherein the scanner device (10) is arranged such that the scanned areas (59) is in a vertical direction. ### Claim 18 (depends on 17) The door sensor system according to claim 17, wherein the light scanner device (10) is adapted such the transmitter deflection means (20) provide vertical scanned areas (59) and by the use of the multi-facet mirror additional tilted scanned areas (59) extend substantially horizontally near the door opening and the door elements and at a predetermined height above or on a ground (80). ### Claim 19 (depends on 16) The door sensor system according to claim 16, comprising at least one light scanner device (10) associated with the door opening (96) to survey the whole surface of the door opening. ### Claim 20 (depends on 1) Door sensor system for a door with movable elements wherein at least one light scanner device (10) according to claim 1 is associated with one of the movable door elements (76; 76-1, 76-2, 76-3, 76-4). ### Claim 21 (depends on 20) The system according to claim 20, wherein at least one light scanner device (10) is associated with each movable door element (76; 76-1, 76-2, 76-3, 76-4). ### Claim 22 (depends on 16) The system according to claim 16, wherein the scanned area (59) has a scanning length (58) that is directed substantially parallel to the door element (76; 76-1, 76-2, 76-3, 76-4). ### Claim 23 (depends on 22) The system according to claim 22, adapted such that the scanning length (58) can be dynamically varied to extend along and not project beyond the door element (76; 76-1, 76-2, 76-3, 76-4) when the door element is between door frame elements (72; 78), and to project beyond the door element when the door element is not between said door frame elements. ### Claim 24 (depends on 16) The system according to claim 16, wherein the light scanner device transmits and receives non-visible light pulses, and the door sensor system further comprises an illumination means adapted to emit visible light so as to visibly illuminate the scanned area (59). ### Claim 25 (depends on 16) The system according to claim 16, further comprising adjustment means for adjusting the orientation of the door sensor device such that a position of the scanned area can be aligned with respect to the door elements (76; 76-1, 76-2, 76-3, 76-4). ### Claim 26 (depends on 25) The system according to claim 25, wherein the adjustment means comprises a screw (62, 64, 66, 68) adapted to adjust the tilt angle of the sweep sector. ### Claim 27 (depends on 16) The system according to claim 16, comprising a mounting bracket means (94) adapted such that the system can be mounted to a door frame element (70, 72, 78) in at least three different angular positions (92-1, 92-2, 92-3) corresponding to at least three different tilt angles of the sweep sector. ### Claim 28 Usage of a light scanner device (10) in a door sensor system (90) for detecting a target object (56) in and/or near a door comprising a door opening (96), and at least one movable door element (76; 76-1, 76-2, 76-3, 76-4), the device (10) comprising: a pulse source (12) adapted to transmit light pulses, a transmitter deflection means (20) adapted to sweep the transmitted light pulses in variable sweep directions across a sweep sector, a photodetection means (42) adapted to detect received light pulses that have been reflected in the sweep sector, a receiver deflection means (24) adapted to re-direct light pulses that have been reflected in the sweep plane (15) to the photodetection means (42), wherein the device (10) is arranged such that the scanned area (59) is in a vertical or nearly vertical direction. ### Claim 29 (depends on 1) Usage of a light scanner device (10) in a door sensor system (90) for detecting a target object (56) in and/or near a door comprising a door opening (96), and at least one movable door element (76; 76-1, 76-2, 76-3, 76-4) characterized in that the device (10) is a device (10) according to claim 1. ### Claim 30 (depends on 16) Usage of a light scanner device (10) in a door sensor system (90) for detecting a target object (56) in and/or near a door comprising a door opening (96), and at least one movable door element (76; 76-1, 76-2, 76-3, 76-4) characterized in that the door sensor system (90) is a system (90) according to claim 16.