Patent ID: 8905553
Filing Date: 2014-12-09
Classification: G03B,H04N

Abstract:
1. A method of detecting a scanning angle range of a laser beam of a laser projector, comprising: disposing a photo sensor on a projection mirror, wherein the photo sensor is located between a first position and a second position on the projection mirror; starting up a laser projector to enter a projection mode, wherein a laser beam emitted from the laser projector in the projection mode performs scanning back and forth between the first position and the second position, such that the photo sensor receives the laser beam sequentially at a first scanning time point and at a second scanning time point to generate a first sensing signal and a second sensing signal, respectively; detecting an actual time interval between the first sensing signal and the second sensing signal; if the actual time interval between the first sensing signal and the second sensing signal conforms to an expected time interval, determining an actual scanning angle range of the laser beam as normal; and if the actual time interval between the first sensing signal and the second sensing signal does not conform to the expected time interval, determining the actual scanning angle range of the laser beam as abnormal and controlling the laser projector to stop emitting the laser beam.