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:
Sep. 11, 2012
Filed:
Jan. 16, 2009
Applicants:
Yoshinori Takenaka, Ibi-gun, JP;
Takeshi Nakamura, Ibi-gun, JP;
Takamitsu Hattori, Ibi-gun, JP;
Inventors:
Assignee:
Ibiden Co., Ltd., Ogaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
H05K 1/11 (2006.01);
U.S. Cl.
CPC ...
Abstract
A printed wiring board disperses stress throughout an inner conductor layer, ensuring the flatness of a substrate. Embedding wires into the outermost insulating layer and forming the wires in a tapered shape that widens downward reduces the amount of stress applied on the edge of the inner conductor layer. This also prevents cracks from forming within the insulating layer, while maintaining favorable yield rates. Via diameters may also be reduced to increase circuit density.