| 摘要 |
<p>1. Apparatus for the automatic switching and control of a room lighting in dependence upon the presence of a moving person at too low a lighting intensity, wherein a light sensor (1, 3) is arranged in the vicinity of an infrared detector (2) and wherein the infrared detector (2) is connected to a control circuit for switching on and off and the light sensor (1, 3) is connected to a control circuit for controlling the light output of the lighting, characterised in that the infrared detector (2) is accommodated in a housing which is impermeable to the infrared radiation to be measured ; that the housing has at least one window or opening (4, 5, 6 or 7, 8, 9) which is permeable to the infrared radiation, whereby the infrared detector has at least one visibility region (12, 13, 14 or 17, 18, 19) which with a predetermined setting-up of the apparatus can be entered and left again by a person moving in the room ; and that at least one light detector (1, 3) forming the light sensor is accommodated in the same housing.</p> |
