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:
May. 08, 1984
Filed:
Dec. 06, 1982
Knut Heitmann, Wetzlar, DE;
Klaus-Dieter Schaefer, Braunfels, DE;
Ernst Leitz Wetzlar GmbH, Wetzlar, DE;
Abstract
Disclosed is a reflex camera having a range finder assembly consisting of a focussing disk, field lens, pentaprism and eyepiece and having an electronic range finder wherein the imaging lens of the reflex camera projects an image of the object to be photographed onto a grating which is arranged in an image plane of the imaging objective lens and which acts as a spatial frequency filter. This image is projected through the pentaprism by means of a fully reflecting concave mirror ground onto the lower edge of the exit surface of the pentaprism. A photoelectric receiver system is associated with the grating, and a reflecting grooved grating is provided as the spatial frequency filter. The groove plane is arranged parallel or obliquely with respect to the image plane, so that the partial beams created by the splitting of the principal beam on the reflecting grooved grating are reflected back in the direction of the top edge surfaces of the pentaprism.