Patent ID: 7196330
Filing Date: 2007-03-27
Classification: G08B

Abstract:
1. A passive infrared sensor comprising: a first infrared sensing system including: a second infrared sensing system including: wherein at least one infrared transmitting portion that allows infrared light to be transmitted there through is formed with said first and second pairs of mirrors in order to allow infrared light from the front detection areas to enter said first and second infrared sensing elements; wherein said first infrared sensing system sets detection areas in a substantially horizontal direction and said second infrared sensing system sets detection areas below the detection areas set by said first infrared sensing system; wherein the side detection areas of said first and second pairs of first optical components have a first maximum detection distance that is longer than a second maximum detection distance of the front detection areas of the second optical components of said first and second infrared sensing systems; and wherein said at least one infrared transmitting portion is configured based on a necessary amount of infrared light to be transmitted through said infrared transmitting portion to ensure detection to the second maximum detection distance and based on the first maximum detection distance and the second maximum detection distance.