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:
Jan. 29, 1991
Filed:
Apr. 30, 1990
Azuma Murakami, Saitama, JP;
Tsuguya Yamanami, Saitama, JP;
Takahiko Funahashi, Saitama, JP;
Toshiaki Senda, Saitama, JP;
Kazuo Aoki, Saitama, JP;
Keiichi Siguyama, Saitama, JP;
Nobuyuki Miyamori, Saitama, JP;
Akio Kikuchi, Saitama, JP;
Manabu Abe, Saitama, JP;
Wacom Co., Ltd., Saitama, JP;
Abstract
The position on a surface of an implement including a tuned circuit with a predetermined resonant frequency is determined and displayed by an apparatus having a housing including the surface. A tablet in the housing includes coils arranged in two coordinate directions parallel to the surface. The coils are excited with AC energy having approximately the same frequency as the resonant frequency. The tuned circuit interacts with the AC energy to change the AC current flowing in the coils as a function of the implement on the tablet. An electronic two-coordinate direction display in the housing configured as a plate is superposed with and lies in a plane parallel to the tablet and the surface. The display responds to the change in AC current resulting from the interaction between the AC energy and the tuned circuit to indicate the position of the implement on the surface.