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. 01, 1989
Filed:
Jun. 20, 1988
Waldo L Landmeier, Scottsdale, AZ (US);
Calcomp Inc., Anaheim, CA (US);
Abstract
A shield for use in eliminating edge effects from an electromagnetic digitizer having an active area of a grid of wires surrounded by a peripheral area of connecting wires containing sensitive interconnecting circuitry. The shield is a pan-shaped shield of a non-ferrous metal sized and shaped to fit over the underside of the grid of wires and surrounding area of connecting wires. The shield comprises a center section disposed over the active area of the grid wires and spaced from the active area so as to provide no interference with the operation thereof and an outer peripheral shielding lip that is disposed in close-spaced, non-contacting relationship to the areas of sensitive interconnecting circuitry contained within the connecting wires. The preferred shield is formed of a single blank of aluminum sheet having peripheral edge portions thereof bent into non-connected, abutting relationship at corners thereof to form the outer peripheral shielding lip.