Abstract:
A stress-reduced circuit board includes an insulating substrate, and first and second electrically conductive layers which are stacked one upon the other, and which respectively have peripheral marginal regions that are configured in a stepped arrangement. The first electrically conductive layer is configured to have an area dimension larger than that of the second electrically conductive layer and a thickness not greater than that of the second electrically conductive layer so as to minimize stress caused by a difference in coefficients of thermal expansion between the insulating substrate and the first and second electrically conductive layers.
Abstract:
To provide a wiring board excellent in connection reliability with a semiconductor chip. A first buildup layer 31 where resin insulating layers 21 and 22 and a conductor layer 24 are laminated is formed at a substrate main surface 11 side of an organic wiring board 10. The conductor layer 24 for an outermost layer in the first buildup layer 31 includes a plurality of connecting terminal portions 41 for flip-chip mounting a semiconductor chip. The plurality of connecting terminal portions 41 is exposed through an opening portion 43 of a solder resist layer 25. Each connecting terminal portion 41 includes a connection region 51 for a semiconductor chip and a wiring region 52 disposed to extend from the connection region 51 along the planar direction. The solder resist layer 25 includes, within the opening portion 43, a side-surface covering portion 55 that covers the side surface of the connecting terminal portion 41 and a projecting wall portion 56 that is integrally formed with the side-surface covering portion 55 and disposed to project so as to intersect with the connection region 51.
Abstract:
Packaged microelectronic devices, methods of manufacturing packaged microelectronic devices, and method of mounting packaged microelectronic devices to printed circuit boards. One embodiment can include a die, an interposer substrate, a solder-ball, and a dielectric compound. The die can have an integrated circuit and at least one bond-pad coupled to the integrated circuit. The interposer substrate is coupled to the die and can have at least one ball-pad electrically coupled to the bond-pad on the die. The interposer substrate can also have a trace line adjacent to the ball-pad, and a solder-mask having an opening over the ball-pad. The solder-ball can contact the ball-pad in the opening. The dielectric compound can insulate the ball-pad and the solder-ball from an exposed portion of the adjacent trace line in the opening.
Abstract:
A process for making a circuit board comprises the following steps of: half-etching a metal layer formed on an insulating substrate by means of a first masking which is positioned on an upper surface of the metal layer; applying a positive liquid resist on the half-etched metal layer from an upper side of the first masking; exposing the positive liquid resist with parallel light from the upper side of the first masking and developing the positive liquid resist in such a manner that a part of the positive liquid resist located under the first masking is protected to be unexposed and undeveloped; etching again the metal layer by means of a second masking composed of the first masking and the protected positive liquid resist to form a conductive pattern on the insulating substrate; and removing the first masking and the second masking from the metal layer.
Abstract:
A method of manufacturing a wiring substrate according to the present invention includes a step of forming a wiring layer including connection terminals on a first insulating layer; a step of forming a second insulating layer on the wiring layer and on the first insulating layer; a step of forming electrically insulative dummy portions separated from the wiring layer on the first insulating layer through patterning of the second insulating layer; a step of forming a third insulating layer on the wiring layer, on the dummy portions, and on the first insulating layer; and a step of forming openings in the third insulating layer for exposing the connection terminals in such a manner that upper end portions of the connection terminals protrude from the third insulating layer, and lower end portions of the connection terminals are embedded in the third insulating layer.
Abstract:
A method of making a multilayer circuit board includes: forming and exposing a first polyimide photoresist layer; forming holes in the first polyimide photoresist layer; forming a second metal layer on the first polyimide photoresist layer; forming a first photoresist mask layer on the second metal layer; patterning the first photoresist mask layer and the second metal layer; forming a second polyimide photoresist layer on the patterned second metal layer; exposing the second polyimide photoresist layer; forming a hole in the second polyimide photoresist layer; forming a third metal layer on the second polyimide photoresist layer; and forming and patterning a second photoresist mask layer on the third metal layer.
Abstract:
An etching process includes: forming a metal film on a substrate having a pattern formation region; forming a mask having a predetermined pattern on the metal film in the pattern formation region, and forming a resist film in part or all of a periphery of the pattern formation region; and dry-etching the metal film in the pattern formation region.
Abstract:
Disclosed herein is a method for manufacturing a printed circuit board, including: applying a solder resist to an insulating material; forming a cavity in the insulating material and the solder resist; forming a seed layer on a surface of the insulating material including the inside of the cavity; forming circuit patterns by plating the inside of the cavity; removing the seed layer formed on the surface of the solder resist; reapplying the solder resist on the solder resist from which the seed layer is removed; and opening a bump forming region of the reapplied solder resist, whereby micro circuits can be easily implemented.
Abstract:
A BGA (ball grid array) printed circuit board is disclosed, which includes a substrate having a dielectric layer, a BGA pad and a solder mask formed on the dielectric layer, and an adhesive glue filled in a gap between the BGA pad and the solder mask. A BGA printed circuit board package structure and a method for fabricating the BGA printed circuit board are also disclosed.
Abstract:
There is provided a printed circuit board in which space between pads used for surface mounting can be narrowed and an FPC can be mounted along with electronic components by the reflow method even when the FPC is mounted and a method of producing the same. A printed circuit board is configured such that a solder resist 3 is formed on the surface of the printed circuit board so as to expose pads 2, a solder resist 4 is formed between the adjacent pads, and solder paste which is as high as or higher than the solder resist 4 is provided by printing on the pad 2 separated from other pads 2 by the solder resists 3 and 4.