Patent attributes
A collimator includes a front lens sleeve, a clamping groove disposed on the front lens sleeve, a linking sleeve fastened on the clamping groove, a snapping groove disposed on the linking sleeve distal the front lens sleeve, a connection sleeve slidably connected to the snapping groove, a constraint sleeve disposed on the snapping groove, and a limit groove disposed on an inner surface of the constraint sleeve. The components cooperate with each other. The test chart is tilted relative to the optical axis of the lens and makes the test chart distributed at different distances along the axis. When using the camera to shoot the collimator, the clarity of different components reflects the relative focus position of the camera so as to detect the vehicle mounted camera.
