Abstract:
Disclosed is an electroplating method for filling cavities, through holes, pocket holes, or micropocket holes of a workpiece with metals. According to said method, the workpiece containing cavities, through holes, pocket holes, or micropocket holes is brought in contact with a metal deposition electrolyte, and a voltage is applied between the workpiece and at least one anode such that a current flow is fed to the workpiece. The inventive method is characterized in that the electrolyte encompasses a redox system.
Abstract:
A wiring board 19 is structured by laminating first substrate 1, second substrate 2 having a smaller mounting area than that of first substrate 1, and base substrate 3 positioned between first substrate 1 and second substrate 2, where at least a portion of the periphery is made thinner than the central portion. Vias 44 are formed in at least either first substrate 1 or second substrate 2. In base substrate 3, the thickness of the portion bonded only to first substrate 1 is less than that of the portion sandwiched between first substrate 1 and second substrate 2.
Abstract:
A surface mount circuit board includes: an insulating substrate (1) having through holes each extending from front to rear surfaces of the insulating substrate; high thermal conductive members (12) each filing a different one of the though holes; lands (13) each disposed to cover an end surface of a different one of the high thermal conductive members and also cover part of the front surface around the peripheral edge of the corresponding through hole; and heat receiving members (14) each disposed to cover an end surface of a different one of the high thermal conductive members and also cover part of the rear surface around the peripheral edge of the corresponding through hole. Each land may be made of solder cream filled into and flashed out of the through hole. Alternatively to the high thermal conductive members, wire rods may be fitted into the respective through holes.
Abstract:
Over a board in which through-holes are formed, conductor circuits are formed on interlayer resin insulating layers. The through-holes have roughed inner walls and are filled with filling material. The parts where the filling material are exposed are covered with through-hole covering conductor layers. Further, via-holes formed directly above the through-hole covering conductor layers are connected to the conductor layers. The filling material is not separated from the through-holes, the connection reliability between the through-holes and the internal layer circuits is high and, further, high density wiring can be realized.
Abstract:
A multilayer printed circuit board comprising a substrate (1) bearing conductor circuits (4) on both sides and having a plated-through hole (9) which connects the conductor circuits (4) and, as serially layered thereon, a resin insulating layer (2) and a conductor circuit (4,5) in an alternate fashion and in repetition, wherein the conductor circuits (4, 5) neighboring in up and down direction are connected through a via-hole (7), characterized in that said plated-through hole (9) has a land (9a), that the via-hole (7) on the land (9a) is filled with a metal, that the upper face of said via-hole (7) and the upper face of said conductor circuit (5) in the same layer are kept in the substantially same plane, and that the distance from the bottom face to the upper face of said via-hole (7) is about 2 to 7 times as long as the thickness of said conductor circuit (5).
Abstract:
A metal layer 18 is sandwiched between insulating layers 14 and 20 so that required strength is maintained. Hence it follows that the thickness of a core substrate 30 can be reduced and, therefore, the thickness of a multi-layer printed circuit board can be reduced. Formation of non-penetrating openings 22 which reach the metal layer 18 in the insulating layers 14 and 20 is simply required. Therefore, small non-penetrating openings 22 can easily be formed by applying laser beams. Thus, through holes 36 each having a small diameter can be formed.
Abstract:
A multilayer printed wiring board having a structure that outer conductor circuit patterns (5) are formed on a core substrate (1) having inner conductor circuit patterns (4) formed thereon through interlaminar resin insulating layers (2), and through-holes (9) are formed in the substrate for electrically connecting the inner conductor circuit patterns (4) to each other. A filler (10) is filled in the through-hole (9). The same kind of roughened layers (11) are formed on the inner conductor circuit pattern (4) on the substrate (1) over a full surface including a side surface thereof. The interlaminar resin insulating layer (2) formed covering the inner conductor circuit patterns (4) is flat. The outer conductor circuit pattern (5) is comprised of an electroless plated layer (12) formed on the interlaminar resin insulating layer (2) and an electrolytic plated layer (13) formed on the electroless plated layer (12).