摘要:
A multilayer printed circuit board is provided having a first dielectric layer and a first plating resist selectively positioned in the first dielectric layer. A second plating resist may be selectively positioned in the first dielectric layer or a second dielectric layer, the second plating resist separate from the first plating resist. A through hole extends through the first dielectric layer, the first plating resist, and the second plating resist. An interior surface of the through hole is plated with a conductive material except along a length between the first plating resist and the second plating resist. This forms a partitioned plated through hole having a first via segment electrically isolated from a second via segment.
摘要:
The present invention relates to printed circuit boards (PCBs), and more particularly, to methods of forming high aspect ratio through holes and high precision stub removal in a printed circuit board (PCB). The high precision stub removal processes may be utilized in removing long stubs and short stubs. In the methods, multiple holes of varying diameter and depth are drilled from an upper and/or lower surface of the printed circuit board utilizing drills of different diameters.
摘要:
A core or sub-composite structure is provided including a dielectric layer between a first conductive film and a second conductive film. The first conductive film may include a first peelable/removable cover layer formed on or coupled to a first conductive layer. The second conductive film may include a second peelable/removable cover layer formed on or coupled to a second conductive layer.
摘要:
A core or sub-composite structure is provided including a dielectric layer between a first conductive film and a second conductive film. The first conductive film may include a first peelable/removable cover layer formed on or coupled to a first conductive layer. The second conductive film may include a second peelable/removable cover layer formed on or coupled to a second conductive layer.
摘要:
A method of making printed circuit board vias using a double drilling and plating method is disclosed. A first hole is drilled in a core, the first hole having a first diameter. The first hole is filled and/or plated with an electrically conductive material. A circuit pattern may be formed on one or two conductive layers of the core. A multilayer structure may then be formed including a plurality of cores that also include pre-drilled and plated via holes, wherein at least some of the pre-drilled and plated via holes are aligned with the first hole. A second hole is then drilled within the first hole and the aligned pre-drilled and plated holes, the second hole having a second diameter where the second diameter is smaller than the first diameter. A conductive material is then plated to an inner surface of the second hole.
摘要:
A multilayer printed circuit board is provided having a first dielectric layer and a first plating resist selectively positioned in the first dielectric layer. A second plating resist may be selectively positioned in the first dielectric layer or a second dielectric layer, the second plating resist separate from the first plating resist. A through hole extends through the first dielectric layer, the first plating resist, and the second plating resist. An interior surface of the through hole is plated with a conductive material except along a length between the first plating resist and the second plating resist. This forms a partitioned plated through hole having a first via segment electrically isolated from a second via segment.
摘要:
A multilayer printed circuit board is provided having a first dielectric layer and a first plating resist selectively positioned in the first dielectric layer. A second plating resist may be selectively positioned in the first dielectric layer or a second dielectric layer, the second plating resist separate from the first plating resist. A through hole extends through the first dielectric layer, the first plating resist, and the second plating resist. An interior surface of the through hole is plated with a conductive material except along a length between the first plating resist and the second plating resist. This forms a partitioned plated through hole having a first via segment electrically isolated from a second via segment.
摘要:
Cost effective and efficient methods to maximize printed circuit board (PCB) utilization with minimized signal degradation are provided. The methods include electrically isolating a segmented via structure by controlling the formation of a conductive material within a plated via structure by utilizing different diameter drills within a via structure for trimming the conductive material at the via shoulder (i.e., the rim of a drilled two diameter hole boundary). The trimmed portion may be voided in the via structure for allowing electrically isolated plated through-hole (PTH) segments. One or more areas of trimmed rims within the via structure are used to form multiple stair like diameter holes to create one or more voids in the via structure. As a result, the formation of conductive material within the via structure may be limited to those areas necessary for the transmission of electrical signals.
摘要:
Ultra-thin dielectric printed circuit boards (PCBs) are provided. An ultra-thin dielectric layer may be coupled to a first conductive layer on a first side of the ultra-thin dielectric layer. A second conductive layer may be coupled to a second side of the ultra-thin dielectric layer, and the ultra-thin dielectric layer is thinner than at least one of the first conductive layer and the second conductive layer. The second conductive layer may be patterned to form electrical paths. The patterned second conductive layer may be filled with a dielectric filler. One or more conductive layers and one or more ultra-thin dielectric layers may also be coupled to the second conductive layer.
摘要:
A method for making an ultra-thin dielectric printed circuit board (PCB) is provided. A first side of a first conductive layer is removably coupled to a disposable base. A first ultra-thin dielectric layer and a second conductive layer are laminated to a second side of the first conductive layer, where the first ultra-thin dielectric layer is positioned between the first and second conductive layers, and the first ultra-thin dielectric layer is thinner than at least one of the first conductive layer and the second conductive layer. The second conductive layer may then be patterned to form electrical paths. The patterned second conductive layer is then filled with a dielectric filler. One or more conductive layers and one or more ultra-thin dielectric layers may then be coupled to the second conductive layer. The disposable base may then be detached from the first conductive layer.