The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 28, 1990
Filed:
Jun. 05, 1989
Carl-Zeiss-Stiftung, Heidenheim/Brenz, DE;
Abstract
For producing phase-contrast images with a microscope which scans the object point-by-point with a beam of illuminating radiation, the illuminating radiation is focused by an objective (31, 32) including a phase-shifting element (33) of preselective geometry. A radiation-sensitive detector (36) is positioned directly behind the object plane (34), seen in the direction of the light; and the shape of the radiation-sensitive area of the detector is adapted to encompass the path of the radiation passing through the geometry of the phase-shifting element (33) of the objective (31, 32), e.g., where the phase-shifting elements (33) comprise an annular aperture, an appropriately conforming annular diaphragm (35) is arranged in front of the detector (36). The advantage of this arrangement is that it does not use any radiation-collecting lens system between the object plane (34) and the detector (36).