Abstract:
A method of forming contacts for an interconnection element, includes (a) joining a conductive element to an interconnection element having multiple wiring layers, (b) patterning the conductive element to form conductive pins, and (c) electrically interconnecting the conductive pins with conductive features of the interconnection element. A multiple wiring layer interconnection element having an exposed pin interface, includes an interconnection element having multiple wiring layers separated by at least one dielectric layer, the wiring layers including a plurality of conductive features exposed at a first face of the interconnection element, a plurality of conductive pins protruding in a direction away from the first face, and metal features electrically interconnecting the conductive features with the conductive pins.
Abstract:
A printed wiring board which can equalize as much as possible the circuit widths of a signal transmission circuit and a power supplying circuit or the like that have required designs of circuit widths to be different significantly and which can be substantially downsized, and a production method therefor, wherein the printed wiring board can be obtained by etching a metal clad laminate plate containing a conductive layer and an insulation layer, and the printed wiring board, where a first circuit and a second circuit formed on the same reference flat surface and being different in thickness coexist, is used. The printed wiring board is characterized in that the first circuit or the second circuit, whichever is thicker, has a clad form where three layers, a first copper layer/a metal-of-different-kind layer/a second copper layer, are sequentially laminated one upon another. The production method for the printed wiring board is characterized by using as a starting material a clad composite material in which three layers, a first copper layer/a metal-of-different-kind layer/a second copper layer, are sequentially laminated one upon another, and by effectively using etching characteristics selecting between the metal-of-different-kind layer and a copper layer.
Abstract:
A method of manufacturing a multilayered printed-circuit board and a low-cost clad board. Copper foil layers (19, 24, 33) for forming conductor layers (10, 17, 18) and nickel plating layers (20, 21) for forming etch stop layers (11, 12) are alternately stacked and compressed to form a clad board (34) for a printed-circuit board. The clad board (34) for the printed-circuit board is selectively etched to manufacture a base. External conductor layers (15, 16) are formed on the surface of the base and patterned. The conductor layers (10, 15, 16) are interconnected electrically through conductors blocks (17, 18) formed by etching the copper foil layers (19, 24, 33) and the nickel plating layers (20, 21) to complete the manufacture of multilayered printed-circuit board.
Abstract:
A plurality of multi-layer metal plates (1) each being composed of a bump forming metal layer (2), an etching stop layer (3), and a wiring film forming metal layer (4), and in which a wiring film (4a) is formed from the wiring film forming metal layer and a bump 2a is formed from the bump forming metal layer are prepared, and on a bump forming surface of a multi-layer metal plate, a wiring film of another multi-layer metal plate is overlapped. Such lamination process is repeated in succession for multi-layering. In addition, a polishing machine for multi-layer wiring board (11a) which includes metal plate holding means (13) for holding a metal plate (1a), cutter holding means (25) for holding a cutter (26) above the metal plate, height adjustment mechanism (20) for adjusting the height of the cutter holding means, and cutter parallel moving mechanism (15) for relatively moving the cutter holding means in parallel to the surface of the metal plate is used to conduct polishing.
Abstract:
An etched tri-metal-layer air bridge circuit board specially designed for fine-pitch applications, comprising: an electrically insulative substrate surface (10), a plurality of tri-metal-layer bond pads (12) arranged in a generally straight row on the substrate surface (10) wherein the row defines a width direction therealong, and a circuit trace (20) arranged on the substrate surface (10), wherein the circuit trace (20) runs between two adjacent ones (22) of the plurality of tri-metal-layer bond pads (12). Each bond pad (12) comprises: (1) a bottom layer (14) attached to the substrate surface (10), the bottom layer (14) being made of a first metal and having an overall width W1 as measured along the width direction; (2) a top layer (18) disposed above and generally concentric with the bottom layer (14), the top layer (18) being made of the first metal and having an overall width W2 as measured along the width direction; and (3) a middle layer (16) made of a second metal connecting the bottom layer (14) and the top layer (18). The bond pads (12) are specially shaped such that W2 > W1 for at least the two adjacent bond pads (12), thus enabling the circuit trace (20) to be spaced closely to the bottom layers (14) of the two adjacent bond pads (12), while allowing the top layers (18) of the pads (12) to be made much larger so as to avoid delamination thereof from their associated middle layers (16).
Abstract:
An etchant useful for chemically milling aluminium from tri-metal layers of copper-aluminium-copper being copper circuit patterns present on opposing surfaces of an aluminium foil, one of the copper patterns being laminated onto a substrate, the etchant comprising an aqueous solution of: (1) 60 to 500 g/l base selected from (a) sodium hydroxide, (b) potassium hydroxide, and (c) their mixture; and (2) 30 to 500 g/l of a nitrite salt, borate salt, a bromate salt, or a mixture of any of them.
Abstract:
An adhesive-free multilayered metal laminate having a g iven thickness which is obtained by bonding a metal sheet ha ving a thin metal film on a surface thereof to a metal foil w ithout using an adhesive; and a process for continuously pro ducing the laminate. The process comprises the steps of; setting a metal sheet on a reel for metal sheet unwinding; se tting a metal foil on a reel for metal foil unwinding; unwin ding the metal sheet from the metal sheet-unwinding reel and activating a surface of the metal sheet to thereby form a fi rst thin metal film on the metal sheet surface; unwinding th e metal foil from the metal foil-unwinding reel and activati ng a surface of the metal foil to thereby form a second thin metal film on the metal foil surface; and press-bonding the activated surface of the first thin metal film to that of th e second thin metal film so that the first thin metal film fo rmed on the metal sheet is in contact with the second thin me tal film formed on the metal foil.
Abstract:
A tri-metallic material (10) for use in the manufacture of printed circuit boards is described and the process for its manufacture is described. The tri-metallic material (10) is a sandwich wherein a copper layer (18,20) is essential the "bread" of the sandwich and an aluminum layer (12) is the filling between both slices of bread. A metallic bonding and/or barrier layer (30,32) is spread on the aluminum (12) and is selected for its highly non-corrosive properties as well as its bonding, and diffusion inhibiting capabilities.