| 摘要 |
PROBLEM TO BE SOLVED: To improve a human body detecting apparatus in detection accuracy, even when the ambient temperature is equal to or higher than the human body temperature. SOLUTION: The human body detecting apparatus 3 comprises an infrared detector section 4; a first amplifier section (1) wherein the higher its temperature is, the higher its gain is set at a temperature lower than the prescribed value, determined as being approximate to the human body temperature; a second amplifier section (2), wherein the higher its temperature is, the lower its gain is set at the temperature equal to or higher than the prescribed value; a human body determining section 9 for determining as to whether an infrared emission object is a human body; a temperature-measuring section 7 for detecting the ambient temperature of a monitor area; and a switch circuit 5 and a switch control section 8 for switching over above two amplifier sections, according to the detected temperature. The sensitivity of detecting the human body becomes approximately constant, including the case where the ambient temperature is equal to or higher than the human body temperature, thereby improving the human body detecting apparatus in the detection accuracy. COPYRIGHT: (C)2007,JPO&INPIT |
