Temperature and passive infrared sensor module

Abstract

A temperature and passive infrared sensor module in which a temperature sensor is mounted so as to not be adversely affected by heat generating electrical components of the sensor module. One embodiment comprises a wallswitch-mounted unit which is designed to be mounted in a wallswitch electrical outlet box with a semi-cylindrical front of the sensor projecting forwardly therefrom. A top section of the projecting semi-cylindrical front has a front curved window, behind which a passive infrared sensor and an ambient light sensor are positioned. A bottom section of the projecting semi-cylindrical front is formed by a removable clip-in door which is provided with air flow vents in a bottom surface and also in projecting front and side surfaces thereof to provide a circulating air flow around a temperature sensor. The temperature sensor and the passive infrared sensor are mounted on a front electrical-lead side of a vertically positioned PC board, and heat generating electrical components are mounted on an opposite, back component side of the PC board. A second embodiment comprises a round ceiling-mounted unit in which heat generating electrical components are mounted on one radial side of a circular PC board, and the temperature sensor is mounted on the opposite radial side thereof circular PC board, as far away therefrom as possible. A shield is also provided to section off and isolate the temperature sensor.

Dependencies are inferred from the claim text.