Optimization in Lens Design

jiangym

Optimization in Lens Design

The session titles included:
1.Lens design using large computers,
2.Lens design using small computers,
3.Lens design using microcomputers,
4.Optimization techniques,
5.Optimization and aberration theory,
6.Aberration theory and computational techniques, and so on.

The optimization techniques had been already established, and the race among various commercial software companies had just started. Over the past four decades, the improvement of the calculation speed and the decrease in cost of computers have been remarkable. Calculation speed changed
from megaflops to gigaflops. The price of computers changed from a million dollars to a thousand dollars. Under these circumstances, the most important viewpoint of the programmer was to make the best use of the improved calculation speed and reduced cost. The purpose of a lens design program is to produce the best design within the shortest time. My early work assumed that the intervention of the lens designer needs to be reduced as much as possible to make the best use of the improved calculation speed. Before optimization, lens designers needed to determine the pattern of the positive and negative elements. To improve the performance, they repeated the small adjustment of targets and tried many different starting points for the optimization. Many tasks, such as the choice of glasses, the choice of surfaces to be aspherized, the reduction of the tolerance sensitivity, and the control of manufacturing feasibility, needed to be determined and controlled. The problems of the choice of glasses and the choice of aspheric surfaces are discrete and combinatorial, and they seemed to be difficult to treat in the ordinary optimization scheme. My design program was developed to control such complicated tasks.

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