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:
Jan. 02, 1990
Filed:
Oct. 21, 1988
Reinhold Schmitt, Munich, DE;
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Abstract
A circuit includes an inversely fedback operational amplifier having a saw tooth deflection signal applied at its input, as well as a coil pair and an output for deflecting the particle beam of a scanning microscope within a scanned field as established by the coil current. A plurality of resistor elements are selected by a switch and a constant current source for feeding a direct current is provided to effect the image displacement at a connection P between the coil pair and respective one of the resistor elements. Since the direct current flows only through the coils but not through the resistor elements as a consequence of the feedback amplifier, image displacement is independent of magnification established by the respective resistor element.