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:
Jun. 04, 1991
Filed:
Nov. 13, 1989
Siegfried Karst, Eisingen, DE;
Wilfried Uhrich, Oberderdingen-Flehingen, DE;
Rolf Zickwolf, Bretten-Rinklingen, DE;
Richard Wolf, GmbH, , DE;
Abstract
A biconvex rod lens for the optics assembly of a medical or technical endoscope comprises of a light transmitting rod and a correcting lens cemented to one end of the rod. The rod is provided with at least one cylindrical collar which is of greater diameter than the adjacent lengths of the rod, for supporting the rod lens on the inner surface of an internal tube in the shaft of the optics assembly. In order to avoid shear forces arising in the cemented joint between the rod and the correcting lens when the shaft and thus the tube are bent when the endoscope is in use, the correcting lens and the rod have, in the region of the cemented joint, a smaller diameter than the cylindrical collar or collars. Fracture of the rod lens is there by avoided.