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AssigneeErnst Leitz G.m.b.H.
InventorsLudwig Leitz, Knut Heitmann, Eckart Schneider, Klaus Dieter Schaefer
Estimating the term…
A system for determining photoelectrically the position of at least one focus plane of an image within an optical apparatus, wherein the object is reproduced at least at one spatial frequency filter of an optical image correlator and there is measurement and/or display of the light fluxes leaving the local frequency filter. In this system light fluxes traversing differing pupil sections of the reproducing optics are modulated in common by a spatial frequency filter and are split up geometrically or physically, or by means of additional modulation in correspondence with the pupil sections. They are consecutively or simultaneously projected on a common photoelectric receiver or on separate photoelectric receivers, the output signals of which are processed further for purposes of controlling display and/or follow-up devices.
In a method for determining the position of a focusing plane of an image within an optical device including an optical imaging system, the improvement comprising the steps of defining the entrance pupil of said optical imaging system into a plurality of different regions (1';
In an apparatus for determining the position of a focusing plane of an image within an optical device comprising an optical image correlator incorporating at least one spatial frequency filter, an optical imaging system to image an object to be measured on said spatial frequency filter, and photoelectrical receiving means, the improvement comprising means for defining the entrance pupil of said imaging system into a plurality of different regions being traversed by light fluxes emitted from said object to be measured as a set of light fluxes and used for imaging said object on said spatial frequency filter which jointly modulates said set of light fluxes;
Dependencies are inferred from the claim text.