[OPTICAL REVIEW Vol. 2, No. 1 (1995) 47-51]

Lens Design : An Attempt to Use eEscape Functionf as a Tool in Global Optimization

Masaki ISSHIKI, Hiroki ONO and Suezou NAKADATE

Engineering Faculty, Tokyo Institute of Polytechnics, 1518 Iiyama, Atsugi, Kanagawa, 243 Japan

(Received July 27, 1994; Accepted October 28, 1994)

In designing lenses with the damped least squares method, the solution obtained by optimization routine is a local minimum of the merit function. To get out of this and seek a different solution, we propose to use an eescape functionf as an additional operand of the lens system to be controlled. Experiments were made on simple models of merit function and the advantage of this technique was ascertained. We also planted this algorithm into OSLO SIX (lens design software by Sinclair Optics) by means of CCL (C-compatible language) and applied it to actual lens design. Experiments convinced us that the method would be an effective tool for global optimization.

Key words : lens design, optimization, global optimization, damped least squares method, damping factor, aberration, merit function