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:
Nov. 11, 2014
Filed:
Mar. 11, 2013
Wacom Co., Ltd., Saitama, JP;
Yasuyuki Fukushima, Saitama, JP;
Hiroyuki Fujitsuka, Saitama, JP;
Wacom Co., Ltd., Saitama, JP;
Abstract
A pen type coordinate indicator for a position input device is provided, which is capable of widening a detection range of a pressing pressure (pen pressure) while preventing erroneous (false) detection. A coil spring (i.e., a first elastic body) and a silicon rubber (i.e., a second elastic body) are interposed between an end surface of a first ferrite core, around which a coil connected to a resonance circuit is wound, and an end surface of a second ferrite core, within the pen. The first and second elastic bodies operate to controllably change (narrow) the distance between the two end faces in accordance with the pressure applied to the pen tip. As a result, an inductance value of the coil wound around the first ferrite core is controllably changed and thus a phase (frequency) of an electric wave transmitted from the resonance circuit to a position detector is controllably changed.