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:
Dec. 25, 2001
Filed:
Apr. 25, 2000
NGK Spark Plug Co., Ltd., , JP;
Abstract
A printed wiring board includes a core substrate including a laminated capacitor. The laminated capacitor includes a plurality of composite dielectric layers and a plurality of metal layers stacked alternately. Three types through-hole conductors are provided which extend between the upper and lower surfaces of the core substrate. The first through-hole conductors are directly connected to first metal layers serving one electrode of the laminated capacitor, the second through-hole conductors are directly connected to second metal layers serving the other electrode of the laminated capacitor, and the third through-hole conductors are not connected to any of the first and second metal layers. The first and second through-hole conductors are used for establishing electrical connections between power supply and ground lines and an IC chip mounted on the printed wiring board. The third through-hole conductor is used as a signal line. Since the laminated capacitor is connected between the first and second through-hole conductors, noise entry is effectively prevented.