- 著者
-
松居 吉哉
- 出版者
- 公益社団法人 応用物理学会
- 雑誌
- 応用物理 (ISSN:03698009)
- 巻号頁・発行日
- vol.29, no.4, pp.256-267, 1960-04-10 (Released:2009-02-20)
- 参考文献数
- 1
In the preceding paper, two sets of unique expressions of the intrinsic aberration coefficients are shown. From either of these, computing formulas can be developed by introducing suitable dependent variables. Among the dependent variables, the most favourable ones to arrange the formulas are J and its reciprocal _??_. Here J=_??_/hQ and _??_=hQ/≡1/J. From the expressions of the intrinsic coefficients by h, h and Q, the first system of computing formulas is developed (formulas from (II•5•2) to (II•5•4c)). From the expressions by h, h and Q, the second system of computing formulas is developed (formulas from (II•5•5) to (II•5•7c)). By using either of the computing systems, the values of the aberration coefficients can be obtained for one surface of the optical system. The aberration coefficients of the total system are obtained by addition of these values for all surfaces. Both of these computing systems should give the same values of the aberration coefficients for the same surface. In the case of the first computing system, the spherical aberration coefficients are computed at the outset, then other coefficients are computed one by one with the aid of the factor J. On the other hand, in the case of the second computing system, the distortion coefficients are computed at the outset, then other coefficients are computed with the aid of the factor _??_. In the case of the surface, at which hQ tends to zero, the results obtained by the first computing system may be accompanied with serious error, and consequently, the second computing system is preferred. But in the case of the surface, at which hQ tends to zero, the first computing system is preferred. With a digital computor, such discrimination can be performed by proper programming, and the results can be automatically guarded against undesirable errors. As numerical examples, typical Gauss-type and Sonnar-type objectives are cited. For these examples, numerical values of the 3rd and 5th order aberration coefficients, the aberration figures computed from these values and the comparison with the actual values are shown.