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. 18, 2000
Filed:
Dec. 19, 1997
Satoshi Sugimoto, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A ground pattern of a printed circuit board of an electronic instrument is connected with a conductive part of a housing of the instrument by a series combination of components respectively having the inductive nature and capacitive nature, or by a series combination of components respectively having the resistive nature and capacitive nature, or by a series combination of components respectively having the inductive nature, capacitive nature, and resistive nature. In this way the impedance can be adjusted against frequency so as to be ready for the frequency where the standing wave appears, the resonance frequency of LC series circuit, and harmonic frequencies of electric current flowing on the circuit board. In another arrangement, the ground pattern of a printed circuit board is connected with the conductive part of the housing of instrument through a plurality of separate connection paths with different impedances.