The Analytical Solution of Anastigmatic Optical Lenses (III)
Thin achromatic doublet (cemented)
1962 年 31 巻 6 号 p. 437-443
詳細
1962 年 31 巻 6 号 p. 437-443
A study is made to determine algebraically the shape of a thin achromatic doublet (cemented) of focal length ƒ' with a stop set behind it, corrected for astigmatism in the Seidel region for the object plane placed at various distances from the doublet.
Algebraic equations derived from Zinker-Sommer's anastigmatic condition for an achromatic lens are always quadratic in terms of the refractive power of the first component, the form of the curves representing the quadratic equations depending on the choice of the first and second lens materials. These equations have two solutions or none, which restricts the doublet to be of required specification.
The result of theoretical treatment can readily be applied to magnifying lenses.
