1953 年 22 巻 11-12 号 p. 378-382
This paper is that concerning to the procedure to design a Ions system having aspberical surfaces. In this method, the residual aberrations of a spherical lens system are reduced step by step by the appropriate deformations of the refracting surfaces within the system following the differential correcting method similar to those used for a spherical system. Though it is only for a few examples at present, hopeful results have been obtained.