Auto focus with spatial filtering and pairwise interrogation of photoelectric diodes
US4047022A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 13, 1976 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Jan 13, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/34
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.