| US 7,573,032 B2 | ||
| Passive infra-red detectors | ||
| Boris Zhevelev, Rishon Lezion (Israel); Yaacov Kotlicki, Ramat Gan (Israel); and Michael Lahat, Kiryat Ono (Israel) | ||
| Assigned to Visonic Ltd., Tel Aviv-Yafo (Israel) | ||
| Filed on Jun. 22, 2006, as Appl. No. 11/425,759. | ||
| Application 11/425759 is a continuation of application No. 10/596695, previously published as PCT/IL2006/000356, filed on Mar. 20, 2006. | ||
| Claims priority of provisional application 60/664231, filed on Mar. 21, 2005. | ||
| Prior Publication US 2007/0152156 A1, Jul. 05, 2007 | ||
| Int. Cl. G01J 5/02 (2006.01) | ||
| U.S. Cl. 250—339.14 [250/353] | 67 Claims |
| 1. A passive infra-red detector having a field-of-view including multiple detection zones, said detector comprising:
a housing having an aperture for passage of infra-red radiation therethrough, said aperture subtending an aperture area;
at least two sensors disposed in said housing; and
at least one infra-red radiation director including a plurality of infra-red optical elements each associated with a different
one of said multiple detection zones, each of said plurality of infra-red optical elements being operative to receive infra-red
radiation from a corresponding one of said multiple detection zones and to direct said infra-red radiation to said sensors
along a corresponding radiation path, a plurality of said radiation paths generally intersecting at an intersection region
located at said aperture, said aperture being generally of the same size as the size of said intersection region, said radiation
director subtending a radiation director area, said radiation director area being larger than said aperture area.
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