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:
Apr. 17, 2012
Filed:
Mar. 04, 2010
Kazuhiro Itsumi, Tokyo, JP;
Takahiro Yamamoto, Fuchu, JP;
Takahisa Nakano, Kawasaki, JP;
Seiji Ikari, Yokohama, JP;
Junji Miura, Naka-gun, JP;
Tsutomu Saito, Yokohama, JP;
Takanobu Nishimura, Chigasaki, JP;
Kazuhiro Itsumi, Tokyo, JP;
Takahiro Yamamoto, Fuchu, JP;
Takahisa Nakano, Kawasaki, JP;
Seiji Ikari, Yokohama, JP;
Junji Miura, Naka-gun, JP;
Tsutomu Saito, Yokohama, JP;
Takanobu Nishimura, Chigasaki, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A stiffness detector transmits acoustic waves to a paper sheet at a predetermined angle to excite Lamb waves. The stiffness detector receives leaky waves of the Lamb waves propagated through the paper sheet at different angles with respect to the paper sheet by a plurality of reception sensors. The stiffness detector is configured to specify a maximum leak angle at which a leak amount of the acoustic waves from the paper sheet becomes maximum based on outputs from the plurality of reception sensors in the reception module and to judge a degree of fatigue of the paper sheet based on the specified maximum leak angle.