Zoom lenses with a single moving element

R. Barry Johnson; Chen Feng

doi:10.1117/12.47947

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1 January 1991 Zoom lenses with a single moving element

Proceedings Volume 1354, 1990 Intl Lens Design Conf; (1991) https://doi.org/10.1117/12.47947
Event: 1990 International Lens Design Conference, 1990, Monterey, CA, United States

Abstract

For the past year or so, we have been exploring a technique for finding potential solutions of what might be called the generalized imaging problem. The underlying hypothesis is that any basic imaging problem can be solved, if at all, by using not more than two generic lenses. A generic lens can comprise a number of elements to affect aberration control, distribute power, etc. Application of this technique yields a plot of regions where potential solution may exist (conversely, regions where solution do not exist). Typically, the abscissa and ordinate are the powers of the two lenses. Once a "power pair" is chosen for evaluation, the spatial positions of the lenses are readily calculated. This technique will be discussed in detail in an upcoming paper. After some success was realized in employing the method to fixed geometries, we investigated its application to finding possible regions of solutions for problems involving zoom lenses. Although the same technique is employed to find potential solutions, presentation of the information for use by the designer is significantly more involved than when dealing with the fixed geometry case. Various parametric constraints can be imposed to appropriately limit solution space. Further discussion of this subject will be contained in the aforementioned paper.

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R. Barry Johnson and Chen Feng "Zoom lenses with a single moving element", Proc. SPIE 1354, 1990 Intl Lens Design Conf, (1 January 1991); https://doi.org/10.1117/12.47947

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