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:
Mar. 06, 1979
Filed:
Dec. 12, 1977
Thomas Marold, Jena, DE;
Wieland Feist, Jena, DE;
Jenoptik Jena G.m.b.H. Jena, Jena, DE;
Abstract
An arrangement for measuring angles, particularly for use in theodolites employs light electric detectors to carry out physical measurements. An index mark which is used in the measuring operation is arranged together with at least one reading position of a graduated circle in the object plane of an imaging system. The latter images the reading position of the graduated circle on to a first light electric detector and the index mark on to a second light electric detector. When two reading positions are used to obtain the reading value then the first reading position is imaged on to the second reading position which, together with the index mark, lies in the object plane of the imaging system. The common arrangement of the reading position and the index mark in the object plane of the imaging system eliminates any inaccuracies of the optical components and hence, accidental measuring errors. So it is possible to do without a very complicated light electrical evaluation system.