Patent ID: 7286052
Filing Date: 2007-10-23
Classification: G08B

Abstract:
1. An intrusion detection system comprising: first and second sensors, each of said first and second sensors having a horizontal field of view; a housing, said first and second sensors being mounted within said housing, said first and second sensors being moveable relative to each other to define first and second relative positions wherein, when said first and second sensors are in said first relative position with respect to each other, said first and second sensors define a combined horizontal field of view having a first angle and wherein, when said first and second sensors are in said second relative position with respect to each other, said first and second sensors define a combined horizontal field of view having a second angle less than the first angle, and in said first relative position said horizontal fields of view of said first and second sensors are substantially overlapping and in said second relative position said horizontal fields of view of said first and second sensors are substantially non-overlapping; and a biasing member biasing said sensors towards one of said first and second relative positions.