Changeable means for different total tracks and its method

摘要

In one embodiment, at least one rotational reflection element is circulated such that one or more reflection surface sets are positioned along an optical path of a scanner. Circulation is provided by rotating a fixing element that is coupled to the rotational reflection element. The fixing element may comprise a power source and a fixing pin, wherein the fixing pin is operable to fix a position of the rotational reflection element.