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:
Sep. 06, 1994
Filed:
Jun. 17, 1993
Tsz Y Tsui, Kwai Chung, HK;
STD Electronic International Ltd., Kwai Chung, HK;
Abstract
A position indicator for producing a variable maximum, variable resistance for supplying a variable amplitude signal to a computer indicating the degree of displacement of a controlled element along an axis includes a variable resistance resistor; a variable displacement element coupled to the variable resistor for varying the resistance of the variable resistor according to displacement of the element along an axis; a first fixed resistance resistor connected to first and second terminals of a transistor, the transistor being connected in series with the variable resistor to form a first series circuit; a second fixed resistance resistor, a potentiometer having a fixed resistance and a variable position contact, and a third fixed resistance resistor connected in series as a second series circuit that is connected in parallel to the first series circuit; and an amplifier having a first inverting input terminal and a second non-inverting input terminal connected to the variable resistor and the variable position contact, respectively, and an output terminal connected to a control terminal of the transistor.