| 摘要 |
PROBLEM TO BE SOLVED: To detect an object by accurately classifying a plurality of infrared detecting sections having different detection areas for each detection area, in an infrared sensor having the infrared detecting sections. SOLUTION: This infrared sensor 1 includes a case body 3 including two pyroelectric elements 2a and 2b (infrared detecting sections) into which infrared radiations Ra and Rb from detection areas A and B come, and a cap lens 4 having two lens sections 6a and 6b for condensing the infrared radiations to the two pyroelectric elements 2a and 2b. Rectangular window sections 3a and 3b are opened in the top surface of the case body 3, and a bridge part 3c between the window sections 3a and 3b constitutes an infrared shielding member by itself. Partial infrared radiation Rr that does not travel in an appropriate direction among the infrared radiations having come into the cap lens 4 is absorbed without being reflected by the bridge part 3c (infrared shielding member) of the case body 3, and does not reach the pyroelectric elements 2a and 2b. The existence of the object for each of the detection areas A and B can be detected accurately based on the detection output of the pyroelectric elements 2a and 2b. COPYRIGHT: (C)2009,JPO&INPIT
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