Patent ID: 8026977
Filing Date: 2011-09-27
Classification: G02B

Abstract:
1. A switching mechanism for a video camera, the switching mechanism comprising: a driving device; a first belt pulley connected with the driving device; a second belt pulley; a belt looped around the first belt pulley and the second belt pulley for power transmission, and including a first protuberance; a translation member provided with a second protuberance, so that the translation member is driven by the belt to be moved through a loose fitting connection between the second protuberance and the first protuberance of the belt; and a positioning element having a positioning plane, at least two inclines, and at least two top surfaces, wherein the positioning plane and the at least two inclines are designed to contact the second protuberance of the translation member alternately so as to restrict and reposition the translation member; wherein the driving device drives the first belt pulley to rotate and thereby drive the second belt pulley and the belt, due to the loose fitting connection between the first protuberance of the belt and the second protuberance of the translation member, so that the moving belt drives the translation member, the loose fitting connection between the first protuberance of the belt and the second protuberance of the translation member being broken and the translation member being stopped after the translation member moves to a predetermined position, then an interaction between the second protuberance and a corresponding one of the inclines of the positioning element bringing the translation member a small distance back and thereby positioning the translation member within a range where the translation member is drivable.