| US 7,504,633 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. 11/425,770. | ||
| Application 11/425770 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 2007/0145277 A1, Jun. 28, 2007 | ||
| Int. Cl. G01J 5/02 (2006.01) | ||
| U.S. Cl. 250—353 [250/336.1] | 32 Claims |
| 1. A radiation detector comprising:
a housing defining an elongate radiation receiving slit aperture lying along a slit axis;
a radiation sensor disposed within said housing along said slit axis at a location spaced from said elongate radiation receiving
slit aperture; and
a radiation reflecting surface arranged to receive radiation passing through said elongate radiation receiving slit aperture
and to focus said radiation on said radiation sensor, said radiation reflecting surface being defined at least partially by
rotation through a rotation angle about said slit axis of a portion of a parabola, whose axis of symmetry extends perpendicularly
to said slit axis through said radiation sensor.
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