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US 7,307,852 B2Granted
Printed circuit board and method for manufacturing printed circuit board
AssigneeIbiden Co., Ltd.
InventorsYasushi Inagaki, Motoo Asai, Dongdong Wang, Hideo Yabashi, Seiji Shirai
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Abstract
Chip capacitors 20 are provided in a printed circuit board 10. In this manner, the distance between an IC chip 90 and each chip capacitor 20 is shortened, and the loop inductance is reduced. In addition, the chip capacitors 20 are accommodated in a core substrate 30 having a large thickness. Therefore, the thickness of the printed circuit board does not become large.
Claims21
A printed circuit board comprising:
- at least one capacitor including a first electrode, a second electrode and a dielectric made of ceramic;
- a core substrate comprising an accommodation layer and a connection layer formed on the accommodation layer, the accommodation layer comprising a glass cloth as a core material and a resin, the connection layer comprising an insulating resin having no glass cloth as a core material;
- conductive pads formed on a first surface of the connection layer;
- a conductive circuit formed on a second surface of the connection layer, the second surface being opposite to the first surface;
- and
- a resin insulating layer and a conductor circuit laminated on the core substrate,
- wherein the accommodation layer includes at least one spot-faced section covered with the first surface of the connection layer to accommodate the capacitor, and the connection layer includes first and second via holes through which the conductive circuit formed on the second surface of the connection layer is electrically connected to the conductive pads, and
- wherein the conductive pads are connected to the first and second electrodes of the capacitor via conductive adhesives.
5 more elements
Dependencies are inferred from the claim text.