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. 24, 1993
Filed:
Oct. 17, 1991
Katsuyuki Kobayashi, Yokohama, JP;
Shinnosuke Taniishi, Kawasaki, JP;
Atsushi Tanaka, Kawasaki, JP;
Yuichiroh Yoshimura, Yokohama, JP;
Kiyoshi Kaneko, Yokohama, JP;
Ryohzo Yanagisawa, Matsudo, JP;
Takeshi Kamono, Chohshi, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A coordinate input apparatus determines the coordinates of contact of a vibration pen with a vibration transmission plate by detecting vibrations from the pen through a vibration sensor. Constants required for measurement are generated in a constant determination circuit on the basis of vibration cycle measurements and a circuit measures the cycle of the detected vibrations from the vibration sensor using the determined constants. Automatic determination of constants eliminates inaccuracies due to component variations and reduces production costs and maintenance.