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:
Oct. 20, 1987
Filed:
Mar. 12, 1986
Hans-Ulrich Baumgartner, Winterthur, CH;
Reto Calderara, Neftenbach, CH;
Hans-Conrad Sonderegger, Neftenbach, CH;
Kristal Instruments AG, Winterthur, CH;
Abstract
The invention relates to a force transducer with at least 100 pC/N sensitivity. The piezo elements of this force transducer are connected rigidly to the force introducing elements, and therefore require no mechanical prestressing. A diaphragm may be provided and is then the only force shunt with a maximum proportion of 5%. The main force flow runs in these transducers through the piezo elements themselves, thereby keeping the pseudo-pyro effect, which is frequently brought about by mechanical shunting, within very narrow limits. Because of bottlenecks in the heat guide path to the piezo elements and the symmetrical construction of the supports, heat transients are also prevented from exerting an appreciable effect on the position of the zero point. This provides zero point stability, which allows accurate measurements in the 0 . . . 1 N range, even where the ambient conditions are unfavorable from the point of view of temperature.