绘制各种产品图册、科技挂图和科技书刊的轴测图时,要画大量椭圆。因此,研制椭圆规者甚多,但有些应用“圆的斜投影是椭圆”原理设计的椭圆规,存在一些设计问题,本文简要论述这些问题及其解决途径,以供商榷。这类称为“倾斜圆板靠模机构”的原理如图1。它有一个直立的中心轴l,其 Drawing a variety of product atlas, technology charts and science books axial mapping, to draw a large number of oval. Therefore, there are many kinds of elliptical rules developed. However, some elliptical rules designed with the principle of “circular oblique projection is elliptical” have some design problems. This article briefly discusses these problems and their solutions, for discussion. This type is called “tilt plate by the mold mechanism ” principle shown in Figure 1. It has an upright central axis l, its