# US 12,225,649 B2 · Electrical field of view control for a passive light sensor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,649 B2 - Document ID: US12225649B2 - Status: Granted - Kind: B2 - Application number: 17/706,244 - Filed: 2022-03-28 - Published: 2022-07-07 - Granted: 2025-02-11 - Earliest claimed: 2020-04-24 - Assignees: Cree Lighting USA LLC - Applicants: Cree Lighting USA LLC - Inventors: Amruteshwar Hiremath; Jin Hong Lim; Kory A. Liszt - Web page: https://patentgrep.com/patent/US12225649B2 ## CPC - H05B 47/13: by using passive infrared detectors - G01J 5/0022: {for sensing the radiation of moving bodies} - G01J 5/0025: {Living bodies (ear thermometers G01J5/0011; detecting, measuring or recording for diagnostic purposes A61B5/00)} - G01J 5/024: {Special manufacturing steps or sacrificial layers or layer structures} - G01J 5/07: Arrangements for adjusting the solid angle of collected radiation, e.g. adjusting or orienting field of view, tracking position or encoding angular position (optical collimating elements G01J5/0806) - G01J 5/0802: Optical filters - G01J 5/0806: Focusing or collimating elements, e.g. lenses or concave mirrors - G01J 5/34: using capacitors, e.g. pyroelectric capacitors - H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL - G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N) ## Abstract A motion sensing device adapts a field of view around a primary sensing axis of the motion sensing device by electrically controlling a detection sensitivity of a passive infrared sensor of the motion sensing device. Responsive to adapting the field of view, the motion sensing device monitors for motion within the field of view using the passive infrared sensor. ## Claims ### Claim 1 A method, implemented in a motion sensing device, the method comprising: adapting a field of view around a primary sensing axis of the motion sensing device by electrically controlling a detection sensitivity of a passive infrared sensor of the motion sensing device; and responsive to adapting the field of view, monitoring for motion within the field of view using the passive infrared sensor, wherein electrically controlling the detection sensitivity comprises setting a threshold for comparison by a comparator to an electrical output of the passive infrared sensor. ### Claim 2 (depends on 1) The method of claim 1, wherein setting the threshold comprises setting a resistance of a programmable resistor in a digital potentiometer communicatively coupled to the comparator. ### Claim 3 (depends on 1) The method of claim 1, wherein setting the threshold comprises: sending a digital signal indicative of a desired threshold; converting the digital signal to an analog signal; and inputting the analog signal to a comparator for comparison with the output of the passive infrared sensor. ### Claim 4 (depends on 1) The method of claim 1, further comprising detecting motion within the field of view and generating an output signal indicating that the motion is detected. ### Claim 5 (depends on 4) The method of claim 4, wherein the output signal is an analog signal. ### Claim 6 A motion sensing device comprising: a passive infrared sensor; and control circuitry communicatively coupled to the passive infrared sensor and configured to adapt a field of view around a primary sensing axis of the motion sensing device by electrically controlling a detection sensitivity of the passive infrared sensor; and responsive to adapting the field of view, monitor for motion within the field of view using the passive infrared sensor, wherein the control circuitry comprises a programmable resistor and a controller communicatively coupled to the programmable resistor. ### Claim 7 (depends on 6) The motion sensing device of claim 6, wherein the control circuitry further comprises a comparator coupled to an output of the passive infrared sensor, wherein an output of the comparator is indicative of motion within the field of view, wherein the programmable resistor is electrically coupled with the comparator to set a comparison threshold of the comparator. ### Claim 8 (depends on 7) The motion sensing device of claim 7, wherein the programmable resistor is in a resistor divider network electrically coupled to the comparator. ### Claim 9 (depends on 6) The motion sensing device of claim 6, wherein the control circuitry further comprises an amplifier circuit portion configured to receive an output of the passive infrared sensor, wherein a resistance of the programmable resistor sets a gain of the amplifier circuit portion. ### Claim 10 (depends on 9) The motion sensing device of claim 9, wherein: the amplifier circuit portion comprises a first amplifier stage and a second amplifier stage; the programmable resistor comprises two programmable resistors; and each of the first amplifier stage and the second amplifier stage comprises one of the programmable resistors. ### Claim 11 (depends on 6) The motion sensing device of claim 6, wherein the control circuitry further comprises a digital potentiometer electrically coupled to the controller, wherein the programmable resistor is located in the digital potentiometer. ### Claim 12 (depends on 6) The motion sensing device of claim 6, wherein the passive infrared sensor is an analog sensor, and wherein an output of the passive infrared sensor is an analog signal. ### Claim 13 A method of manufacturing a motion sensing device, comprising: providing a passive infrared sensor; and electrically coupling a first input of a comparator to an output of the passive infrared sensor and a second input of the comparator to a threshold voltage source, wherein an output of the comparator is indicative of motion within a field of view of the passive infrared sensor. ### Claim 14 (depends on 13) The method of claim 13, wherein the threshold voltage source comprises a circuit portion comprising a programmable resistor and a controller electrically coupled to the programmable resistor to set a resistance of the programmable resistor. ### Claim 15 (depends on 13) The method of claim 13, further comprising: selecting a reference voltage generator of a desired voltage from among a plurality of reference voltage generators of different voltages, wherein the threshold voltage source comprises the reference voltage generator. ### Claim 16 A method, implemented in a motion sensing device, the method comprising: adapting a field of view around a primary sensing axis of the motion sensing device by electrically controlling a detection sensitivity of a passive infrared sensor of the motion sensing device; and responsive to adapting the field of view, monitoring for motion within the field of view using the passive infrared sensor, wherein electrically controlling the detection sensitivity comprises altering a gain of a circuit portion coupled to an output of the passive infrared sensor. ### Claim 17 (depends on 16) The method of claim 16, wherein altering the gain of the circuit portion comprises setting a resistance of a programmable resistor within the circuit portion. ### Claim 18 A motion sensing device comprising: a passive infrared sensor; and control circuitry communicatively coupled to the passive infrared sensor and configured to: adapt a field of view around a primary sensing axis of the motion sensing device by electrically controlling a detection sensitivity of the passive infrared sensor; and responsive to adapting the field of view, monitor for motion within the field of view using the passive infrared sensor, wherein the control circuitry comprises a controller, a comparator coupled to an output of the passive infrared sensor, wherein an output of the comparator is indicative of motion within the field of view, and a digital-to-analog converter configured to receive, from the controller, a signal indicative of a desired threshold for the comparator and to output, to the comparator, a converted signal based on the received signal.