| 摘要 |
PURPOSE:To appreciate a picture which is easily visible and appeals forcefully, by using a biconvex lens of one lens in one group, which has positive refractive power for magnifying and displaying a picture of a television set, and also satisfies a specified expression. CONSTITUTION:When radiuses of curvature of each face of a lens L, a face interval, a refractive index, and an Abbe number are denoted as r1, r2, d1, n1 and nu1, respectively, and a deviation amount from the lens apex in a position of a darial distance Y of an aperture from the optical axis of the lens is denoted as X, aspherical coefficients and a conical constant are denoted as AD, AE, AG and K, respectively, and also the following numerical particulars are satisfied. A focal distance of the whole system (f)=186.46, a half view angle omega=12.2 deg., r1=198.867, n1=1.491, nu1=57.2, r2=-165.336, AD=8.27846X10<-8>, AE=2.4008X 10<-12>, AF=3.16458X10<-17>, AG=2.43741X10<-21>, and K=0. In case of such a constitution, the aberration is corrected very well. Accordingly, an excellent performance can be displayed by a simple constitution of one lens in one group. |
