| 摘要 |
<p>PURPOSE:To prevent mis-detection due to the hot or cold air flow and operation from continuing after a passenger passes through a condenser zone. CONSTITUTION:A door safety device for elevator is provided with a condenser lens 2, a thermoelectric conversion element 3, two kinds of band pass filters which make the output frequency element of the thermoelectric conversion element 3 which is generated when a passenger passes through around an entrance selectively pass, and a detector 1 which detects the getting on/off of a passenger from the signal after the passenger passes through the band pass filters.</p> |
