# US 10,481,262 B1 · Optical sensor for measuring displacement of a haptic plate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,481,262 B1 - Document ID: US10481262B1 - Status: Granted - Kind: B1 - Application number: 15/788,608 - Filed: 2017-10-19 - Granted: 2019-11-19 - Earliest claimed: 2017-10-19 - Assignees: Facebook Technologies, LLC - Applicants: Facebook Technologies, LLC - Inventors: Riccardo DeSalvo; Ian Andreas Marquez; Jeff Jakkit Ongnok - Web page: https://patentgrep.com/patent/US10481262B1 ## CPC - G01S 17/08: for measuring distance only (indirect measurement G01S17/46; active triangulation systems G01S17/48) - G01H 9/00: Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by using radiation-sensitive means, e.g. optical means - G06F 3/011: {Arrangements for interaction with the human body, e.g. for user immersion in virtual reality (blind teaching G09B21/00)} - G06F 3/016: {Input arrangements with force or tactile feedback as computer generated output to the user} - G06T 19/006: {Mixed reality (object pose determination, tracking or camera calibration for mixed reality G06T7/00)} - 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 - G01H: MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES - G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N) - G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL ## Abstract An optical sensor measures displacement of a haptic plate that provides haptic sensation to a user. The optical sensor comprises a light source, a plurality of optical detectors, and a controller. The light source is configured to illuminate a surface of the haptic plate in which a haptic wave propagates causing displacement of portions of the haptic plate in one or more directions. The plurality of optical detectors is configured to detect light reflected from the surface of the haptic plate. At least two optical detectors of the plurality of optical detectors are positioned relative to the light source such that an amount of light received at each of the optical detectors is based at least in part on a direction of displacement of the haptic plate. The controller is configured to monitor the haptic wave using the detected light from the plurality of optical detectors. ## Claims ### Claim 1 An optical sensor comprising: a light source configured to illuminate a surface of a haptic plate in which a haptic wave propagates causing displacement of portions of the haptic plate in one or more directions; a plurality of optical detectors configured to detect light reflected from the surface of the haptic plate, and at least two of the plurality of optical detectors are positioned relative to the light source such that an amount of light received at each of the optical detectors is based at least in part on a direction of displacement of the haptic plate; and a controller configured to monitor the haptic wave using the detected light. ### Claim 2 (depends on 1) The optical sensor of claim 1, wherein the light source is configured to emit infrared light, and the plurality of optical detectors is configured to detect the infrared light. ### Claim 3 (depends on 1) The optical sensor of claim 1, wherein the light source is configured to emit visible light, and the plurality of optical detectors is configured to detect the visible light. ### Claim 4 (depends on 1) The optical sensor of claim 1, wherein two optical detectors of the plurality of optical detectors are positioned equidistant to the light source on either side of the light source along a first axis that bisects the light source and the two optical detectors. ### Claim 5 (depends on 4) The optical sensor of claim 4, wherein a difference in the amount of light received by the two optical detectors is based at least in part on a rotation of a portion of the haptic plate along the first axis. ### Claim 6 (depends on 4) The optical sensor of claim 4, wherein two additional optical detectors of the plurality of optical detectors are positioned equidistant to the light source on either side of the light source along a second axis that is different than the first axis, and the second axis bisects the light source and the two additional optical detectors. ### Claim 7 (depends on 6) The optical sensor of claim 6, wherein the first axis and the second axis are orthogonal to each other. ### Claim 8 (depends on 1) The optical sensor of claim 1, wherein the amount of light received by the plurality of optical detectors is based at least in part on a vertical displacement of a portion of the haptic plate from the light source and the plurality of optical detectors. ### Claim 9 (depends on 1) The optical sensor of claim 1, wherein at least one actuator of a haptic plate is modulated based at least in part on the detected light by the optical sensor. ### Claim 10 A haptic device comprising: a haptic plate including a center portion and an outer portion that circumscribes the center portion, wherein the haptic plate is a medium for propagation of a haptic wave; and an optical sensor coupled to the haptic plate configured to monitor the propagation of the haptic wave, the optic sensor comprising: a light source configured to illuminate a surface of the haptic plate in which a haptic wave propagates causing displacement of portions of the haptic plate in one or more directions, a plurality of optical detectors configured to detect light reflected from the surface of the haptic plate, and at least two of the plurality of optical detectors are positioned relative to the light source such that an amount of light received at each of the optical detectors is based at least in part on a direction of displacement of the haptic plate, and a controller configured to monitor the haptic wave using the detected light. ### Claim 11 (depends on 10) The haptic device of claim 10, wherein the light source is configured to emit infrared light, and the plurality of optical detectors is configured to detect the infrared light. ### Claim 12 (depends on 10) The haptic device of claim 10, wherein the light source is configured to emit visible light, and the plurality of optical detectors is configured to detect the visible light. ### Claim 13 (depends on 10) The haptic device of claim 10, wherein two optical detectors of the plurality of optical detectors are positioned equidistant to the light source on either side of the light source along a first axis that bisects the light source and the two optical detectors. ### Claim 14 (depends on 13) The haptic device of claim 13, wherein a difference in the amount of light received by the two optical detectors is based at least in part on a rotation of a portion of the haptic plate along the first axis. ### Claim 15 (depends on 13) The haptic device of claim 13, wherein two additional optical detectors of the plurality of optical detectors are positioned equidistant to the light source on either side of the light source along a second axis that is different than the first axis, and the second axis bisects the light source and the two additional optical detectors. ### Claim 16 (depends on 15) The haptic device of claim 15, wherein the first axis and the second axis are orthogonal to each other. ### Claim 17 (depends on 10) The haptic device of claim 10, wherein the amount of light received by the plurality of optical detectors is based at least in part on a vertical displacement of a portion of the haptic plate from the light source and the plurality of optical detectors. ### Claim 18 (depends on 10) The haptic device of claim 10, wherein at least one actuator of the haptic plate is modulated based at least in part on the detected light by the optical sensor.