摘要:
A printed wiring board has a via land, a glass epoxy resin layer, a via conductor, and a block layer. The via land is formed on a core layer. The glass epoxy resin layer is formed on the core layer and the via land. The via conductor is formed on the via land. The block layer is formed on the via land, between the via conductor and the glass epoxy resin layer.
摘要:
A printed circuit board on which a semiconductor chip is flip chip mounted, comprising a circuit pattern to which a conductive bump, provided in a corner portion of a semiconductor chip, is connected, an insulating layer for holding the circuit pattern, and a protection pad which is positioned on the insulating layer relative to the circuit pattern, to which the conductive bump is connected.
摘要:
The present invention provides a through-hole structure for connecting a connector to a printed circuit board, the through-hole structure comprising a signal through-hole having a conductive layer therein for supplying a signal to the printed circuit board, power through-holes having a conductive layer therein for supplying power to the printed circuit board, and dielectric constant adjusting portions formed among the signal through-hole and the power through-holes. Moreover, the present invention provides a printed circuit board having the above-described through-hole structure formed therein.
摘要:
The invention relates to a circuit board having high density circuit and excellent connection reliability and lamination reliability. A resin fabric cloth (4) is provided by arranging single fibers (4a) or fiber bundles composed of a plurality of single fibers, which single fiber has a linear thermal expansion coefficient smaller than that of silicon, at least in two directions and alternately weaving them. In the board, the resin fabric cloth is covered with a resin portion (5) made of a resin material having a linear thermal expansion coefficient larger than that of silicon.
摘要:
A ball grid array module is provided. In particular, the ball grid array module includes a substrate with two layers of insulation positioned thereon. At least one cavity having a side wall and a bottom wall is positioned in the first and second layers of insulation. The ball grid array module is adapted for having a solder ball positioned on the bottom wall of the cavity. During heating and reflow of the solder ball, positioning of the solder ball in the cavity prevents dislodging of the solder ball.
摘要:
According to one of the invention, a circuit board comprises a conductive layer. The conductive layer includes a first land portion, a second land portion apart from the first land portion in a plan view, and a line portion connecting the first land portion and the second land portion to each other. The line portion includes lead portions through which a current is to flow and an opening portion arranged between the lead portions. The opening portion penetrates the conductive layer in a thickness direction.
摘要:
The invention relates to a circuit board having high density circuit and excellent connection reliability and lamination reliability. A resin fabric cloth (4) is provided by arranging single fibers (4a) or fiber bundles composed of a plurality of single fibers, which single fiber has a linear thermal expansion coefficient smaller than that of silicon, at least in two directions and alternately weaving them. In the board, the resin fabric cloth is covered with a resin portion (5) made of a resin material having a linear thermal expansion coefficient larger than that of silicon.
摘要:
Provided are a circuit board which meets requirement of suppressing peeling of a through hole conductor, a mounting structure and a method for manufacturing the circuit board. A circuit board (2) is provided with a base (5) and a through hole conductor (11). The base is provided with a fiber layer (9) and a through hole (S). The fiber layer has a single fiber (8) arranged along one direction and a resin for covering the single fiber (8). The through hole (S) penetrates the fiber layer (9), and the through hole conductor is formed in the through hole. The single fiber (8) partially protrudes to the side of the through hole conductor (11) from an inner wall surface of the through hole (S), and the protruded part is covered with the through hole conductor (11).
摘要:
In a substrate member (e.g., circuit board), a plurality of openings (15) are formed in an insulating film (14) which covers electric lines (12) formed on a substrate 11, with pad constructing (contacting) portions (13) of selected ones of the electric lines being exposed. In one example, the pad constructing portion (that portion of the pad to which final connection is to occur, e.g., by solder to a semiconductor device), is set to a first dimension (e.g., length) having a dimension less than a corresponding dimension of the original length. The film openings are also set to another dimension having an allowance size larger than a corresponding dimension of the pad constructing portion. The opening is thus of sufficiently large size in comparison to the respective pad being exposed so as to assure effective tolerance compensation for film positioning deviations in at least two (e.g., X and Y) directions as might occur during production of the substrate member.
摘要:
In a substrate member (e.g., circuit board), a plurality of openings (15) are formed in an insulating film (14) which covers electric lines (12) formed on a substrate 11, with pad constructing (contacting) portions (13) of selected ones of the electric lines being exposed. In one example, the pad constructing portion (that portion of the pad to which final connection is to occur, e.g., by solder to a semiconductor device), is set to a first dimension (e.g., length) having a dimension less than a corresponding dimension of the original length. The film openings are also set to another dimension having an allowance size larger than a corresponding dimension of the pad constructing portion. The opening is thus of sufficiently large size in comparison to the respective pad being exposed so as to assure effective tolerance compensation for film positioning deviations in at least two (e.g., X and Y) directions as might occur during production of the substrate member.