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在二次非球面加工时,都先加工出一个球面,然后在这个球面基础上加工成所需要的非球面。这个球面就称做比较球面,该比较球面通过二次非球面的顶点和两边缘点,如图1所示。这个球面也称做最接近比较球面,在此球面的基础上加工二次非球面最省工时。最接近比较球面和二次非球面之间的偏差称做偏离量,显然在顶点和两边缘点的偏离量为零,而其它位置的偏离量随y不同而变化,其中偏离最大的
In the second aspheric processing, are first processed out of a spherical, and then processed on the basis of the spherical aspheric. This spherical surface is called a comparative spherical surface, and the comparative spherical surface passes through the apexes and two edge points of the secondary aspheric surface, as shown in FIG. 1. This sphere is also called closest to the comparison sphere, on the basis of this sphere processing aspheric second most time-saving. The difference between the closest spherical and the secondary aspheric surface is called the deviation. Obviously, the deviation from the top and the two edges is zero, while the deviation from other positions varies with y, and the deviation from the largest