Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-02-18
1998-02-10
Allen, Stephone
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502221, 250353, 340567, G08B 1318, G01J 508
Patent
active
057172030
ABSTRACT:
A detector assembly for giving an infrared sensor a detecting range of about 180.degree. includes a semi-cylindrical focusing lens and a pair of reflective mirror surfaces which is positioned behind the lens and oriented symmetrically with respect to each other with respect to a central symmetry plane and tilted with respect to both the axial direction of the semi-cylindrical lens and the symmetry plane such that infrared signals passing through the lens at azimuthal angles of incidence up to about 90.degree. from the symmetry plane and impinging on either of the reflective surfaces will be received by the sensor. When the sensor thus detects the presence of an infrared-emitting source, a detection signal is outputted and power from a rechargeable battery is transmitted first at a higher voltage for a specified period of time and then at a lower voltage to a fluorescent tube through a contact piece being pressed against the tube. The contact piece is surrounded and supported by an electrical insulator which, in turn, is surrounded and supported by a socket member made of a thermally conductive material and provided with a planar protrusion which can be attached to a housing structure such that heat can be effectively conducted away from the contact piece.
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