| 摘要 |
<p>PURPOSE:To provide a static human-sensitive device capable of detecting the distance to a human body in two stages of the first zone (far) and the second zone (near) and a human-sensitive lighting system capable of automatically switching the illumination in two stages of high and low based on the detected result at a low cost. CONSTITUTION:Infrared rays are emitted from the light source 1 of one light emitting diode and fed to a human body, the reflected light is received by the first light reception section 2 and the second light reception section 3 of two photo-diodes arranged at a distance, it is photoelectrically converted and amplified, and the obtained light reception voltage is compared with the threshold value voltage set to a value different for each light reception section. If the light reception voltage is larger than the threshold value voltage, the output voltage Vout1, Vout2 are outputted to the output circuit, and the existence of the human body and the far/near state from the light reception sections are detected. The output circuit, an off-delay function, and a self-holding function are incorporated in a lighting circuit, and the high/low-switching of illumination and the automatic turning-on/off are performed.</p> |
