Patent
1974-02-20
1976-01-20
Skogquist, Harland S.
350206, G09b 2322
Patent
active
039329496
ABSTRACT:
A method for the visual demonstration of the formation and causes of the five Seidel aberrations and chromatism appearing on the image plane of a converging lens system. A method and device utilizing that method are provided for the refraction through a lens system of multiple pinhole images of a single object such as to visually demonstrate: (a) the respective distortions of each of said images on a movable ground-glass after they have passed through different portions of the system but prior to the system's image plane; (b) the convergence, in cinematographic-like progression on the moving ground-glass, of these multiple refracted images to and superimposition at the system's focal plane and their respective contribution to the abberrations in the composite image observed on that plane; (c) the further asymmetrical convergence or collapse of the discrete refracted images beyond the focal plane to their respective "image-apertures", said image-apertures defining the image plane of the physical pinhole apertures; (d) the visual "sommersault", as seen on the moving ground-glass, of the collapsing images whereby they appear to "squeeze" through and reverse themselves in passing through the said image-apertures; (e) the visual and readily apparent aberrations caused by the aforesaid "sommersault" when it appears near the system's image plane. A ground-glass "sandwich" comprised of two or more lightly etched glass plates is provided whereby the characteristic horizontal and vertical bright-line images of astigmatism may be simultaneously observed in the process of formation and whereby the full nature of the so-called "circle of least confusion" in optical theory may be visually shown for the first time. A changeable lens system is provided whereby the affect of the multiple bending of images in correcting projected image distortions and aberrations can be visually demonstrated in process.
REFERENCES:
patent: 2529107 (1950-11-01), Shapiro
patent: 2881536 (1959-04-01), Sprecher
patent: 3094790 (1963-06-01), Scidmore
patent: 3185021 (1965-05-01), Thompson
patent: 3752555 (1973-08-01), Klotz
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