反射式光电编码器

Abstract

A reflective photoelectric encoder was developed.The grating self-imaging principle was introduced,the production process of a high-density reference grating was improved and a 32768line grating and a highly integrated optical reading head were prepared.Then,the high-precision reflective optical encoder was completed.By using multi reference points,the encoder could confirm the absolute position easyly and quickly,and its standard zero point was determined by the most initialize rotate angle of 5.625°.The angle measuring accuracy of the encoder was measured by a self collimating light tube and a 23surface prism.The measuring results indicate that the Mean Square Root Error for single reading head is 1.11″and that for double reading head is 0.75″.The gap between reflection grating and reading head is about 2.0mm,which is ten times larger than that of tradition type encoders.The results demonstrate that the high-precision reflective optical encoder developed has simple structures and its reading head shows high quality photoelectric signals.It can provide a solution scheme for high precision angle measurement.