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:
Jun. 12, 2001
Filed:
Jan. 30, 1998
Toshiaki Watanabe, Chiba, JP;
Yoshiyuki Morita, Chiba, JP;
Abstract
A wireless type coordinate reading apparatus, in which a coordinate value of a position indicated by a coordinate indicator can be calculated in high resolution, the coordinate indicator can be made simple, and further widths of a pen shaft and a pen tip can be narrowed is disclosed. A coordinate reading apparatus is constituted by AC magnetic field generating means for generating an AC magnetic field; a coordinate indicator having a magnetic material for producing a magnetic pulse caused by the Large Barkhausen effect when the magnetic material is positioned in the magnetic field generated from the AC magnetic field generating means; magnetic field detecting means for detecting the magnetic pulse caused by the Large Barkhausen effect; and coordinate calculating means connected to the magnetic field detecting means, for calculating a position indicated by the coordinate indicator in response to a signal produced based upon the magnetic pulse detected by the magnetic field detecting means.