| 摘要 |
PURPOSE:To satisfactorily correct various aberrations to easily obtain a target performance by forming a condenser lens and an image reforming lens to such shapes that they satisfy specific conditions. CONSTITUTION:The condenser lens and the image reforming lens satisfy conditions of inequalities I to IV where R1 and R2 are radiuses of curvature of the incidence-side face and the exit-side face of the condenser lens and Bs, fs, and ts are the image forming power, the focal length, and the thickness on the axis of the image reforming lens respectively and R3 and R4 are radiuses of curvature of the incidence-side face and the exit-side face of the image reforming lens. Thus, extents of aberrations occurring in the condenser lens and the image reforming lens are suppressed to a certain level or lower and aberrations of the condenser lens and the image reforming lens are cancelled by each other to satisfactorily correct the overall distortion and the coma. |
