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US 8,410,374 B2Granted
Printed wiring board
AssigneeIbiden Co., Ltd.
InventorsToru Furuta, Kotaro Takagi, Michio Ido, Fumitaka Takagi
Life of this patent
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Abstract
A printed wiring board has an insulative board having a first surface and a second surface on the opposite side of the first surface, a wiring formed on the first surface of the insulative board and having a pad and a conductive circuit contiguous to the pad, and a metal film formed on the pad. The pad is provided to mount an electronic component having a gold bump. The pad has a thickness which is greater than a thickness of the conductive circuit.
Claims10
A printed wiring board comprising:
- an insulative layer having a first surface and a second surface on an opposite side of the first surface;
- a wiring formed on the first surface of the insulative layer and having a pad and a conductive circuit contiguous to the pad, the pad being configured to mount an electronic component having a gold bump;
- a solder-resist layer formed on the first surface of the insulative layer and the wiring, the solder-resist layer having an opening portion in which the pad is formed;
- and
- a metal film formed on the pad and the conductive circuit, the conductive circuit being extended from underneath the pad in the opening portion such that the metal film is formed on a top surface of the pad, a top surface of the conductive circuit, and a side surface of the pad,
- wherein the pad has a thickness greater than a thickness of the conductive circuit, and the thickness of the pad is less than a thickness of the solder-resist layer.
3 more elements
Dependencies are inferred from the claim text.