Patent ID: 7573032
Filing Date: 2009-08-11
Classification: G01J,G08B,Y10S

Abstract:
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.