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US 12,584,796 B2Granted
Passive infrared sensor and method of control
AssigneeKidde Fire Protection, LLC
InventorMateusz Mazur
Life of this patent
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Abstract
A method of controlling a field of view of a passive infrared sensor, the method comprising: providing a passive infrared sensor comprising: an infrared detector configured to detect infrared signals from a plurality of detection zones; and an electrochromic mask comprising a plurality of electrochromic sections; and applying a voltage to one or more of the plurality of electrochromic sections to control transmission of a predetermined range of infrared signals to the detector from one or more of the plurality of detection zones.
Claims13
A passive infrared sensor comprising:
- an infrared detector configured to detect infrared signals from a plurality of detection zones,
- and
- a mirror arranged to reflect infrared signals to the infrared detector, wherein an electrochromic mask is positioned between the mirror and the infrared detector or wherein an electrochromic mask forms the mirror;
- wherein the electrochromic mask comprises a plurality of electrochromic sections, wherein each electrochromic section is electrically connected to a voltage source, and wherein the electrochromic mask is arranged such that the application of a voltage from the voltage source to one or more of the plurality of electrochromic sections changes the field of the view of the infrared sensor.
1 more element
Dependencies are inferred from the claim text.