Title: Auto focus with spatial filtering and pairwise interrogation of photoelectric diodes

Abstract: 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.

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Inventors: Holle, Werner H. (Wetzlar, DT)

Application Number: 648785
Filing Date: 1976-01-13
Publication_date: 1977-09-06
Assignee: Ernst Leitz GmbH (Wetzlar, DT)
Primary Class(es): 250/201.7 250/204, 250/550, 396/111, 396/128
Other Classes:
US Patent Ref:

3555280	Jan, 1971	Richards	250/236.
3781110	Dec, 1973	Leitz et al.	356/4.
3798449	Mar, 1974	Reinheimer et al.	250/201.
3844658	Oct, 1974	Gela et al.	250/201.
3846628	Nov, 1974	Towne	354/25.
3875401	Apr, 1975	Stauffer	250/201.
3958117	May, 1976	Stauffer	356/4.

Other Refs:
Primary Examiner: Nelms, David C.
Assistant Examiner:
Attorney: Wells; Gilbert L.