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:
Oct. 19, 2010
Filed:
Nov. 22, 2005
Tadahiko Hirai, Ohta-ku, JP;
Takayuki Sumida, Kawasaki, JP;
Tadahiko Hirai, Ohta-ku, JP;
Takayuki Sumida, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
The present invention provides an RF tag which does not have an integrated circuit such as a silicon chip, can retain a plurality of information, can rewrite or add the information, and is inexpensive. The RF tag includes an RF resonance circuit which has at least two capacitors connected in series or parallel and at least one coil antenna formed on a substrate, wherein at least one of the capacitors is an anti-fuse which irreversibly short-circuits when a voltage higher than a threshold voltage is applied to the anti-fuse, and the surface of an electrode constituting the capacitor has a mean roughness of 1 μm or less.