一、定义:透镜光轴为连接其两球面球心的连线。透镜或光组的几何轴(实际是定位轴或转动轴)需随具体情况而定。中心偏(或称偏心)是指光轴对几何轴的偏离。定中(心)过程就是使两轴重合的过程。不过,胶合定中却是使两光轴重合,一般均指光轴与几何轴重合.有关此类问题,我们称之为中心问题,一般只在磨边工序开始才提出,特殊情况例外。 First, the definition: the optical axis of the lens to connect the two spherical surface of the connection. The geometry axis of the lens or light group (actually the positioning axis or axis of rotation) is to be determined on a case-by-case basis. Center (or eccentric) refers to the optical axis of the geometric axis deviation. Centering (heart) process is to make the two axes coincide process. However, gluing is to make the two optical axis coincide, generally coincide with the geometric axis of the optical axis coincidence.For such issues, we call the central issue, generally only commenced in the edging process, with exceptional exceptions.