270 degree motion sensor

Communications: electrical – Condition responsive indicating system – Specific condition

Reexamination Certificate

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Details

C340S541000, C340S565000, C340S693500, C340S693600, C340S693900, C340S693110, C250S353000, C250S342000, C250SDIG001

Reexamination Certificate

active

06175309

ABSTRACT:

BACKGROUND OF THE INVENTION
The invention relates to an outdoor light fixture which has a motion sensing function. More particularly, the device relates to a motion sensor which has a detection range of 270 degrees.
SUMMARY OF THE INVENTION
In one embodiment of the present invention, the outdoor light fixture is adapted to sense motion in a 270 degree motion detection zone. To accomplish this, three sensors are arranged behind a Fresnel lens. Two of the three sensors are placed a spaced distance apart and parallel to each other and the third sensor is perpendicular to the other sensors. This forms a U-shaped configuration which permits a
270
degree detection pattern.
In another embodiment, the housing of the motion sensor is configured in a compact design. Rather than having a lens which contains a bulbous 270 degree or greater lens on the end, which extends beyond the outer periphery of the housing, recesses are used to inset the lens while still maintaining a 270 degree configuration.


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patent: 6100803 (2000-08-01), Chang

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