| 摘要 |
<p>A miniaturised and sealed PIR sensor device adapted to be positioned within the body of a lighting appliance and comprising a housing (10) with integrally moulded lens (12) and containing a PIR sensor (14) behind the lens (12) and associated switching circuitry (15) contained within the housing (10). A sealing substance (16) fills the remaining space of the housing (10) beneath a welded-on back plate (11). The device may be located conveniently behind the mounting plate of a wall mounted lighting appliance with the lens (12) exposed by or projecting through a small aperture in the appliance. The device obviates the need for a separate PIR housing alongside of beneath the appliance.</p> |
