Optics: motion pictures – Removable film strip magazine type
Patent
1973-11-27
1976-04-27
Hix, L. T.
Optics: motion pictures
Removable film strip magazine type
352140, G03B 310
Patent
active
039538630
ABSTRACT:
In a method for focusing a reproducing objective, such as may be used for measuring distances, wherein multiplication of the image of the entrance pupil is achieved by image-splitting optical elements mounted in the plane of the object image, the improvement comprising:
Projecting the light fluxes from different parts of the pupil image plane on separate sets or groups of photoelectric receivers, deriving a signal from the comparison of the output signals from these receiver groups and using this signal as a criterion for focusing as a function of magnitude and sign. Apparatus for performing the method includes a grid of prisms or pyramids, and a beam splitter for directing light through two separate photoelectric receiver masks.
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patent: 3233533 (1966-02-01), Sauer
patent: 3450018 (1969-06-01), John, Jr.
patent: 3469925 (1969-10-01), Urrbach et al.
patent: 3504610 (1970-04-01), Donitz
patent: 3511156 (1970-05-01), Larks
patent: 3516742 (1970-06-01), Donitz
patent: 3596101 (1971-07-01), Soneya
patent: 3622797 (1971-11-01), Bragg
patent: 3631785 (1972-01-01), Perlmann et al.
patent: 3639048 (1972-02-01), Heaney
patent: 3682071 (1972-08-01), Hosoe
patent: 3781110 (1973-12-01), Leitz et al.
IBM Disclosure Bulletin, Vol. 15, No. 2, July 1972.
Ernst Leitz G.m.b.H.
Hix L. T,.
O'Connor E. M.
Wells Gilbert L.
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