METHOD FOR DESIGNING LENS

摘要

A method for designing a lens is disclosed. Multiple coordinates of an optical face of the lens are set according to formulas of Xn=Xn−1+Dn−1; and Yn=Yn−1+Kn−1*Dn−1. The coordinates are then connected by lines to form a primary curve of the optical face. A test is made to the primary curve to find unsatisfied coordinates. The unsatisfied coordinates are updated by amending the slopes thereof. The updated coordinates are then connected with the unchanged coordinates by lines to obtain an update curve. The update curve is further tested and amended until a satisfied curve is obtained.

主权项

1. A method for designing a lens, comprising:
setting a first coordinate (X1, Y1) as a start of an optical face of the lens; giving a first reference slope K1 and a first reference distance D1, calculating a second coordinate (X2, Y2) by substituting the first coordinate (X1, Y1), the first reference slope K1 and the first reference distance D1 into formulas of Xn=Xn−1+Dn−1; and Yn=Yn−1+Kn−1*Dn−1, thereby obtaining the second coordinate (X2, Y2) as (X1+D1, Y1+K1*D1); repeating the above steps and obtaining next coordinates by using the formulas of Xn=Xn−1+Dn−1; and Yn=Yn−1+Kn−1*Dn−1, an nth coordinate (Xn, Yn) being represented as (X1+D1+D2+D3+D4+ . . . Dn−1, Y1+K1*D1+K2*D2+K3*D4+ . . . Kn−1*Dn−1); sequentially connecting the coordinates by lines, thereby obtaining a primary curve of the optical face of the lens; testing the primary curve of the optical face of the lens and finding an unsatisfied coordinate (Xm, Ym); amending the primary curve of the optical face of the lens by steps:
giving a new reference slope Km−1′ to replace a original slope Km−1 of the unsatisfied coordinate (Xm, Ym); obtaining a new coordinate (Xm′, Ym′) according to the new reference slope Km−1′; and connecting the new coordinate (Xm′, Ym′) with unchanged coordinates to obtain an update curve of the optical face of the lens.