Patent ID: 6348691
Filing Date: 2002-02-19
Classification: G08B,Y10S

Abstract:
A decorative lighting fixture activated by a passive infra-red (PIR) motion detector incorporated into said lighting fixture for monitoring motion in a field of view, said lighting fixture including a motion detector housing shaped to have a decorative external appearance and disposed to form an integral part of the lighting fixture, said motion detector housing defining an aperture for admitting infra-red radiation from the field of view and including a PIR sensor disposed within said motion detector housing for receiving said infra-red radiation, comprising:a mirror assembly disposed within said motion detector housing and comprising a plurality of opaque elongate members disposed about a central longitudinal axis and azimuthally spaced about said axis to define an alternating sequence of open elongate slots and opaque elongate members, each said elongate member being formed with a mirror face on an inner surface thereof generally facing said longitudinal axis, said elongate members and mirror faces being formed and arranged to define a plurality of zones in said field of view; wherein said sensor is disposed substantially at said longitudinal axis; and wherein said mirror faces and said slots are formed and arranged to define a plurality of first optical paths for monitoring said field of view at a first vertical level of view, each said first optical path directing infra-red radiation from an associated zone of said field of view admitted through said aperture and passing through a respective one of said slots to a respective one of said mirror faces and therefrom to said sensor, and wherein said elongate members and said slots are formed and arranged to define a plurality of second optical paths for monitoring said field of view at a second vertical level of view, each said second optical path directing infra-red radiation from an associated zone of said field of view admitted through said aperture and passing through a respective one of said slots to said sensor without being deflected by any of said mirror faces.