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. 05, 2008
Filed:
Feb. 03, 2005
Method for checking return path of printed and cad apparatus for designing patterns of printed board
Hirotsugu Fusayasu, Uji, JP;
Seiji Hamada, Osaka, JP;
Shoichi Mimura, Hirakata, JP;
Miyoko Irikiin, Amagasaki, JP;
Hirotsugu Fusayasu, Uji, JP;
Seiji Hamada, Osaka, JP;
Shoichi Mimura, Hirakata, JP;
Miyoko Irikiin, Amagasaki, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A CAD apparatus designing patterns of a printed board. The apparatus includes a signal wiring pattern detecting unit for detecting a signal wiring pattern, and a guard ground detecting unit for tracing the signal wiring pattern along the longitudinal direction thereof, in order to detect whether or not a guard ground exists within a distance from the signal wiring pattern to a predetermined first discriminant value, identify a non-guard ground section within the distance to the first discriminant value, and to detect whether or not a guard ground exists within another distance from the signal wiring pattern to a second discriminant value, which is larger than the first discriminant value. The apparatus also includes a return path judging unit for judging an error of guard ground when no guard ground exists within the distance to the second discriminant value, thereby quickly checking a return path without mistake.