本文提出了两种产生常用非球面机构的原理。从不同于已有各种机构的根本原理出发,找到新的产生非球面的途径,并论证了其几何关系。这种方法的特点是以线接触产生非球面,因此将得到平滑的表面。 This paper presents two principles that produce common aspheric mechanisms. Starting from the fundamental principles of all kinds of institutions, a new way of generating aspheric surfaces is found out, and its geometric relationship is demonstrated. The characteristic of this method is that the line contact produces an aspherical surface, so a smooth surface will result.