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. 05, 1990
Filed:
Nov. 30, 1988
Herbert Koch, Biebertal, DE;
Peter Weimar, Staufenberg, DE;
Ernst Leitz Wetzlar GmbH, Wetzlar, DE;
Abstract
In an electromotively adjustable focusing system for a microscope, a rotatable and axially moveable knob controls both the coarse and fine adjustments of the object stage. The knob is mechanically connected to a tacho-generator producing an output voltage responsive to the direction and amount of rotation of the knob. The knob is also mechanically joined to a switch, which is opened or closed by axial movement of the knob in opposite directions. The closing of the switch causes a focus control circuit to provide to the focusing motor a signal that causes coarse (rapid) focusing. When the switch is opened, however, the motor provides fine adjustment of the object stage.