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. 18, 1983
Filed:
Aug. 02, 1982
Takuma Nakamura, Kanagawa, JP;
Kazumi Sugizaki, Kanagawa, JP;
VLSI Technology Research Association, Kanagawa, JP;
Abstract
A positioning apparatus employing a piezo worm type shifting mechanism in which the position of a platform to be moved to a desired position is measured with a position measuring device and data representing the position thus measured is applied to a microprocessor. The microprocessor calculates the phase of a voltage corresponding to the distance through which the platform should be moved to arrive at the desired position. The digital output is subjected to digital-to-analog conversion and a pulsive voltage produced thereby the magnitude of which corresponds to the distance to be moved. The pulsive voltage is applied directly to expanding and contracting piezoelectric elements which move the platform. The platform is thereby positioned at the desired position at a high speed and with a high accuracy.