The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 24, 1987
Filed:
Oct. 23, 1985
John K Guscott, Lynnfield, MA (US);
George Vulgaris, Sharon, MA (US);
ADT, Inc., Parsippany, NJ (US);
Abstract
The disclosed steerable mirror assembly and cooperative housing for a ceiling mountable passive infrared intrusion detection system of the present invention includes first and second relatively rotatable field forming mirrors cooperative with a focusing mirror to provide first and second substantially curtain-like fields of view at any selected pointing directions through 360.degree. of azimuth. The field forming mirrors have a preselected non-constant radius of curvature selected to provide uniform detection sensitivity at any range within the fields of view of the several curtains. A modular housing is disclosed having cooperative, releasably assemblable components that allows ready in-the-field installation, and subsequent maintenance and troubleshooting. The housing includes a tamper switch that is operative upon an unauthorized tampering with the housing after installation to provide a signal indication of a possible system deactivization attempt.