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:
Aug. 04, 1992
Filed:
May. 06, 1991
Gregory F Russell, Yorktown Heights, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A digitizer tablet (10) having an array of conductors that define a sensing plane (12) for sensing an electromagnetic signal generated by a pointing device (16) disposed external to the plane. The tablet includes circuitry, coupled to the array of conductors, for determining a magnitude of an electrical signal or signals induced within the array of conductors by the pointing device. The tablet also includes a data processor (30) that is responsive to the determined magnitude for accurately estimating both a position and an angular orientation of the pointing device relative to a coordinate system associated with the sensing plane. The array of conductors is comprised of an x-axis sensor array (14a) and a y-axis sensor array (14b). Each sensor array includes a plurality of differentially interconnected and overlapping coil pairs. Each coil of a coil pair includes a major loop having auxiliary loops coupled to each end thereof for compensating for unmeasured magnetic fields beyond an end of the coil.