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US 4,047,022 AGranted
Auto focus with spatial filtering and pairwise interrogation of photoelectric diodes
AssigneeErnst Leitz G.m.b.H.
InventorWerner H. Holle
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AssigneeErnst Leitz G.m.b.H.
InventorWerner H. Holle
Estimating the term…
Apparatus for photoelectrically determining the position of at least one focal plane of an image inside an optical instrument comprising an optics for imaging at least one object on at least one spatial frequency filter of an optical image correlator and further comprising a measurement display of the light fluxes filtered through the spatial frequency filter. The apparatus 1-45 for receiving the light fluxes concentrated through optical components 3,4 comprises at least one photoelectric detector system 5, 6, 31, 32. This detector system has at least one row of several detectors 11-15, . . . n, and electrical means 16, 17, 26-28, 33-38 are provided for pairwise interrogation of the photoelectric detectors 11-15, . . . n and also for the analysis of the photoelectric signals generated during the interrogation.
In an apparatus for photoelectrically determining the position of at least one focal plane of an image inside an optical instrument comprising optical components for imaging at least one object on at least one spatial frequency filter of an optical image correlator and further comprising a measurement display of the light fluxes filtered through the spatial frequency filter, the improvement comprising:
Dependencies are inferred from the claim text.