很长时间以来,做为园分度元件的度盘、园光栅,没有一个统一的衡量其质量的技术指标,这给设计、使用和同行业学术交流及评比带来许多问题,为了解决这个问题,过去多年来曾开过几次讨论会,都未能统一意见。1980年12月在成都召开的“全国刻划技术学术交流会”上,全国各地的代表又提出了这个问题, For a long time, the scale and garden grating as the indexing element of the park did not have a unified technical index to measure its quality, which brought many problems to the design, use and academic exchange and evaluation of the same industry. In order to solve this problem In the past few years have held several seminars, failed to unify their views. At the “National Scribing Technology Academic Exchange Conference” held in Chengdu in December 1980, representatives from all over the country again raised this issue,