APPROACH MONITOR SENSOR

PURPOSE:To surely detect an objective part with high sensitivity and to eliminate the feeling of presence (the feeling of overbearing,) CONSTITUTION:The front face opening of an enclosure 31 is closed by an infrared translucent filter 32 which light transmissivity is less than 5% on the condition of lambda=750nm and 90% on the condition of lambda=945nm, and an infrared light emitting diode 33 which peak wavelength is 945nm, photodiode (infrared detector) 36, CCD camera 42 which effective sensitivity is 100 on the condition of lambda=700nm and is less than 10 on the condition of lambda>=945nm, and infrared floodlamp 43 are arranged inside the filter 32. When an infrared light pulse group 35 is periodically radiated from the light emitting diode 33 and reflected light 37 is detected by the photodiode 36, a control signal is outputted to an output terminal 44 while the detection is performed for cascade connected pulse groups, a VTR is operated, infrared light is projected and illuminated from the infrared floodlamp 43, and during the control signal, the image pickup output of the CCD camera 42 is extracted and recorded in the VTR.