| 摘要 |
<P>PROBLEM TO BE SOLVED: To overcome the problem that a step is generated, radiated infrared rays enter from the outside of a to-be-detected region on a wall surface of the step and are received by an infrared light receiving element, and the detection region is expanded when a plurality of prisms are provided so as to adjust a light collection angle since a convex and Fresnel collective lens comprising a high-density polyethylene improves a light collection rate to an infrared light receiving element due to a structure of a Fresnel lens in a spot area detecting thermopile infrared detector. Ž<P>SOLUTION: When a stray light is prevented and a spot area detection is implemented, two resin-molded divided parts are welded and bonded between the convex and Fresnel collective lens comprising the high-density polyethylene and the thermopile infrared detector. The thermopile infrared detector includes an aperture built-in high-density polyethylene collective lens pressed into an integrated with the convex and Fresnel collective lens comprising the high-density polyethylene. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
