Multilayer wiring board
AssigneeMurata Manufacturing Co., Ltd.
InventorMasato Nomiya
Life of this patent
Estimating the term…
Abstract
A multilayer wiring board is capable of preventing the occurrence of cracking in the vicinity of a connection portion of a conductor pattern disposed inside a basic material layer and a via-hole conductor even when the conductor pattern is connected to the via-hole conductor. A multilayer wiring board includes basic material layers and the constraining layers that are alternately stacked. In the material layer, a via-hole conductor is connected to an intermediate conductor pattern. An extended portion is defined by extending an end of the via-hole conductor beyond the intermediate conductor pattern inside the basic material layer.
Claims7
A multilayer wiring board comprising:
- at least one basic material layer and at least one constraining layer stacked on each other;
- a conductor pattern disposed on or inside at least one of the at least one basic material layer or the at least one constraining layer, the conductor pattern extending in a surface direction in which the at least one basic material layer and the at least one constraining layer extend;
- and
- a via-hole conductor extending inside at least the at least one basic material layer in a direction in which the at least one basic material layer and the at least one constraining layer are stacked, the via-hole conductor being connected to the conductor pattern;
- wherein
- the via-hole conductor includes a via body and an extended portion, the via body is connected to an intermediate conductor pattern disposed inside the at least one basic material layer such that portions of a single one of the at least one basic material layer are disposed on both sides of the intermediate conductor pattern in a stacking direction of the at least one basic material layer and the at least one constraining layer, and the extended portion is defined by the via body being extended in a direction towards the at least one constraining layer and away from the via body, and the extended portion is connected to the intermediate conductor pattern;
- and
- an end of the extended portion of the via-hole conductor is not directly electrically or physically connected to any conductor pattern and is in direct contact with a surface of the at least one constraining layer.
Dependencies are inferred from the claim text.