本文给出了两种零位标志序列,它的设计数据和实物实测光通比优于国外同类元件。一零位标志是特殊编码的线纹组,它由一组非周期性刻线,即不等宽、不等距、若干亮带和暗带组成的。亮带或暗带可以分解成由若干等宽亮线或者等宽暗线组成的。如果将两块零位标志重叠起来,当两块零位标志 In this paper, two kinds of zero mark sequence are given, and its design data and measured optical ratio are better than similar foreign components. A zero mark is a special coded line group, which consists of a group of non-periodic lines, unequal width, unequal spacing, several bright and dark bands. Bright band or dark band can be broken down into a number of equal-width bright lines or equal-width dark lines. If the two zero mark overlap, when the two zero mark