The Research On Processing Technology Of Large Relative Aperture Aspheric Surface

In order to realize the large relative aperture aspheric surface of high precision processing, solve the difficult problems in this field, and the large relative aperture aspheric surface processing method is deeply researched in this paper. First, according to preston hypothesis, the mathematical model is built, and determine basic idea of processing. Then, for existing in the processing of the "edge effect" problem is deeply discussed, and in the process of processing, the polishing mould and polishing solution are analyzed, and through the contrast that the processing parameters are determined. Finally, using CCOS to process it, and use profilometer for surface shape detection, and the surface error are analyzed.The experimental results indicate that the plano-concave aspheric lens which caliber is76mm, after processing the surface error is0.3μm, the roughness is level three, center deviation is0.8μm. All the parameters can meet the requirement of the optical element.