Abstract:
A printed wiring board (1) such that openings (8L) formed around a pad (12L) which is a photo-via land do not overlap a pad (12L) and the area of each of the openings (8L) around the pad (12L) is equal to that of each of the other openings (8), the amount of resin (13) with which each of the openings (8, 8L) is filled is equal to that with which each of the openings (8L) is filled over the whole wiring board (1), and the amounts of resin (13) overflowing from the openings (8, 8L) are equal to each other. The circuit pattern provided on the upper surface of an interlayer insulating layer formed on the printed wiring board can be connected to a conductor pad area without causing any defective connection, providing a highly-reliable printed wiring board.
Abstract:
A resonant element is provided with a multilayer board, comprising a plurality of conductor layers isolated by a dielectric, a signal via conductor, penetrating through the multilayer board, and a plurality of ground vias, penetrating thought the multilayer board and disposed around the signal via conductor. The multilayer board comprises a first conductor layer, a second conductor layer, and a corrugated conductor layer disposed between the first and the second conductor layers. The corrugated conductor layer comprises a corrugated signal plate, connected to the signal via conductor, and a corrugated ground plate, connected to the plurality of ground vias, isolated from the corrugated signal plate by the dielectric.
Abstract:
Methods of manufacturing at least a portion of a printed circuit board. The circuit board is formed to include a plurality of sub-assemblies, each of the sub-assemblies including a plurality of circuit layers and having at least one countersink and at least one hole, the countersink having a first diameter and a first depth from a first side of at least one of the sub-assemblies and into the at least one sub-assembly, the hole having a second diameter smaller than the first diameter and a second depth longer than the first depth from the first side of the at least one sub-assembly and into the at least one sub-assembly at the countersink; a metal metalized within the hole and the countersink; a lamination adhesive interposed between one and a corresponding one of the sub-assemblies and having at least one via formed there through; and a counter paste filled within the via.
Abstract:
A multi-layer substrate includes a planar transmission line structure and a signal via, which are connected by a multi-tier transition. The multi-tier transition includes a signal via pad configured to serve for a full-value connection of the signal via and the planar transmission line; and a dummy pad connected to the signal via, formed in an area of a clearance hole in a conductor layer disposed between a signal terminal of the signal via and the planar transmission line, and isolated from the conductor layer.
Abstract:
At (1502) is a digital input, at (1504) an external I/O, and at (1506) an analog or digital output, and at (1508) a test point. Also as indicated are positions for resistors: R1, R2A, R2B, R3A, R3B, R4A, R4B, R5, R6, R7; and capacitor: C1. Also shown are transistor. Q1, +5V,+3.3V, and ground. At the locations indicated are where the schematic entries in Figure 15A may be placed. A plus inside a trace denotes the +5V supply, and a minus inside a trace denotes ground. For example, if resistive components can only be placed horizontally, then padsassociated with R2B, R5, and R6 may be repositioned.
Abstract:
To manufacture a flexible multilayer circuit board comprising an inner circuit board also serving as a cable part, an outer circuit board provided on one or both of the sides at predetermined portions of the inner circuit board and also serving as component mounting parts, and a through hole plating electrical connection part (12) formed at predetermined portions of the inner and outer circuit boards ; surface protective layers (3,5) are formed on the outer sides of wiring patterns (1, 4) of the inner circuit board at portions apart outward from the position of a through hole (13) for the through hole plating electrical connection part (12).