Occupancy sensors for long-range sensing within a narrow field of view
First Claim
1. An occupancy sensor for long-range sensing within a narrow field of view, said occupancy sensor comprising:
- sensor circuitry operable to sense occupancy and generate occupancy signals, said sensor circuitry comprising a passive infrared sensing circuit that defines a detection zone;
a voltage input terminal coupled to said sensor circuitry for receiving an input voltage;
an output terminal coupled to said sensor circuitry for outputting said occupancy signals;
a rigid housing disposed about said sensor circuitry, said rigid housing having an opening over said sensing circuit; and
a flat lens mounted on said rigid housing over said opening, said sensing circuit positioned such that said detection zone is substantially perpendicular in plan view to said flat lens.
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Accused Products
Abstract
Occupancy sensors are presented that include a flat lens for focusing detecting beams into narrower, longer range beams than those of conventional curved lenses. A sensing circuit generates a detecting beam that is substantially perpendicular to the flat lens. The flat lens has a plurality of lens segments that provide long, intermediate, and short range sensing beams. To facilitate positioning of an occupancy sensor, the sensor includes a plurality of indicators that indicate the sensor'"'"'s long and short range sensing limits. An override timer circuit is provided that upon activation sets the occupancy sensor in occupancy mode for a predetermined time period. A warm-up timer circuit is also provided that upon power-up automatically sets the occupancy sensor in occupancy mode for a predetermined warm-up period. These occupancy sensors are well-suited for environments with long aisles, high ceilings, and high intensity discharge lighting.
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Citations
24 Claims
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1. An occupancy sensor for long-range sensing within a narrow field of view, said occupancy sensor comprising:
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sensor circuitry operable to sense occupancy and generate occupancy signals, said sensor circuitry comprising a passive infrared sensing circuit that defines a detection zone;
a voltage input terminal coupled to said sensor circuitry for receiving an input voltage;
an output terminal coupled to said sensor circuitry for outputting said occupancy signals;
a rigid housing disposed about said sensor circuitry, said rigid housing having an opening over said sensing circuit; and
a flat lens mounted on said rigid housing over said opening, said sensing circuit positioned such that said detection zone is substantially perpendicular in plan view to said flat lens. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An occupancy sensor for long-range sensing within a narrow field of view, said occupancy sensor comprising:
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sensor circuitry operable to sense occupancy and generate occupancy signals, said sensor circuitry comprising a sensing circuit that generates a detecting beam;
a voltage input terminal coupled to said sensor circuitry for receiving an input voltage;
an output terminal coupled to said sensor circuitry for outputting said occupancy signals;
a rigid housing disposed about said sensor circuitry, said rigid housing having an opening over said sensing circuit; and
a flat lens mounted on said rigid housing over said opening, said sensing circuit positioned such that said detecting beam is substantially perpendicular to said flat lens. - View Dependent Claims (16)
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17. A method of long-range occupancy sensing within a narrow field of view, said method comprising:
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defining long, intermediate, and short range detection zones through a flat lens with a sensing circuit of an occupancy sensor, said flat lens comprising a plurality of lens segments that provide said occupancy sensor with long, intermediate, and short range occupancy sensing; and
positioning said sensing circuit such that said detection zones are substantially perpendicular in plan view to said flat lens. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
indicating when occupancy is sensed in said long range; and
indicating when occupancy is sensed in said short range.
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19. The method of claim 17 further comprising outputting an occupancy signal indicating occupancy for a predetermined time period.
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20. The method of claim 19 further comprising returning said occupancy sensor to normal operation substantially upon elapse of said predetermined time period.
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21. The method of claim 19 further comprising adjusting said predetermined time period.
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22. The method of claim 17 further comprising outputting an occupancy signal indicating occupancy for a predetermined warm-up period when power is initially applied to said occupancy sensor.
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23. The method of claim 22 further comprising returning said occupancy sensor to normal operation substantially upon elapse of said predetermined warm-up period.
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24. The method of claim 22 further comprising adjusting said predetermined warm-up period.
Specification