Movable barrier operator with an obstacle detector

摘要

A movable barrier operator comprises a pattern generator for projecting a beam across the barrier path; a CCD camera for recording a pattern produced by projected beam across the barrier path; and a controller for sensing when the pattern produced by projected beam is changed by presence of an obstacle, and generating an obstacle detection signal in response thereto. The movable barrier operator is responsive to the obstacle detection signal to control the barrier drive.