Abstract:
An electronic component mounting structure includes a board (110) and an electronic component (130) mounted on a front surface of the board (110). The board (110) includes lands (112). The electronic component (130) includes a body (131) and terminals (132) extending from the body (131). Each terminal (132) is electrically connected to a corresponding one of the lands (112) of the board (110). The terminal (132) has a first terminal portion (132a) extending along the front surface of the board (110) and a second terminal portion (132b) extending toward the front surface of the board (110). Each land (112) includes a land portion electrically soldered to the first terminal portion (132a) and a blind hole (111) for receiving the second terminal portion (132b). The first terminal portion (132a) is soldered to the land portion in a reflow process under the condition that the second terminal portion (132b) is inserted in the blind hole (111).
Abstract:
A method for forming a bump on an electrode pad characterized in that at least the following steps (a)-(d) are conducted on a wiring substrate which is composed of a base and a plurality of electrode pads: (a) a step wherein a double-layered film composed of a lower layer made of an alkali-soluble, radiation-nonsensitive resin composition and an upper layer made of a negative, radiation-sensitive resin composition is formed on the wiring substrate, and then an aperture pattern is formed in a corresponding position of the electrode pad; (b) a step wherein a low-melting metal is introduced into the aperture pattern; (c) a step wherein the low-melting metal is reflowed by conducting a press or a heat treatment so as to from a bump, and (d) a step wherein the double-layered film is removed from the substrate. By using the double-layered film having different characteristics, the high-resolution property and the easy-release property become compatible.
Abstract:
Provided is a wiring structure and the like which can completely connect a wiring layer to a body to be wired while keeping insulation between two adjacent wiring layers and realize high density packaging due to a narrowed pitch. In a semiconductor-embedded substrate (1), a conductive pattern (13) is formed on both sides of a core substrate (11) and a semiconductor device (14) is placed in a resin layer (16) stacked over the core substrate. The resin layer has via-holes (19a,19b) so that the conductive pattern and a bump (14p) of the semiconductor device protrude from the resin layer. Inside the via-holes, the bump and conductive pattern are respectively connected to via-hole electrode portions (23a,23b) whose cross-sectional area has been increased toward the bottom of the via-hole. A void is defined between the via-hole electrode portion and upper portion of the inner wall of the via-hole.
Abstract:
The invention relates to a package board having a core board (30) on each surface of which a plurality of conductor circuits are formed with an interlaminar resin insulating layer therebetween, wherein a plurality of soldering pads (75U,75D) are formed on the IC chip mounted side surface, as well as on the other side surface to be connected to another board, so that said soldering pads (75D) on the other side surface are larger than those on said IC chip side surface of said package board, and a dummy pattern (58M) is formed between conductor circuit patterns formed on said IC chip mounted side surface of said core board.
Abstract:
The present invention refers to a printed circuit board comprising a wiring substrate provided with conductor circuits (5), a solder resist layer (14) formed on the surface of the substrate, and a solder body (17) fed onto a pad as a part of the conductor circuit (5) exposed from an opening portion formed in the solder resist layer (14), in which the surface of the pad is rendered into an electrically conductive roughened layer (11), and a metal layer (15,16) having a non-oxidizing metal (16) on at least a surface-thereof is formed on a surface of the pad exposed from the opening portion, and the solder (17) is supported on the pad through the metal layer (15,16).
Abstract:
A wired circuit board having terminals that can ensure large electrical connection areas while preventing shorting of adjacent terminals, to ensure that the terminals are electrically connected with external terminals through molten metal. An insulating base layer 3 is formed on a supporting board 2 so that insulating concave portions 13 are formed at portions thereof where external connecting terminals 8 are to be formed. A conductive pattern 4 is formed on the insulating base layer 3 so that a number of lines of wire 4a, 4b, 4c, 4d, the magnetic head connecting terminals 7, and the external connecting portions 8 are integrally formed, and conductive concave portions 9 are formed in the external connecting terminals 8. Thereafter, an insulating cover layer 10 is formed on the insulating base layer 3 so that the magnetic head connecting terminals 7 and the external connecting terminals 8 are exposed from the insulating cover layer 10. In the suspension board with circuit 1 thus formed, when the external connecting terminals 8 are connected with connecting terminals of a read/write substrate via the solder balls 21, reliable connection therebetween can be ensured.
Abstract:
A multilayer printed circuit board comprising a core substrate, multilayer wiring layers formed on the substrate by alternately laminating an interlaminar insulating layer and conductor pattern and a group of solder pads having solder bumps planarly arranged on an outermost surface of the multilayer wiring layers, characterized in that first, the solder pads located from first row to fifth row from an outer position of the solder pad group are constructed with flat pads connected to conductor patterns located on the outermost surface and having solder bumps formed on surfaces of the pads, while the solder pad group other than these solder pads are constructed with viaholes connected to a flat innerlayer pad group located in an inner layer and having solder bumps formed in recess portions of the viaholes and, second, the solder pads located from first row to fifth row from an outer position of the innerlayer pad group are constructed with flat pads connected to conductor patterns in the same layer as the innerlayer pad group, while the innerlayer pad group other than these pads are constituted with flat pads connected to a further innerlayer flat pad group located inward the above innerlayer through viaholes and, third, the layer having the structure of the above second feature is at least one layer.
Abstract:
Method and system for moving a frozen adhesive particle towards a target body, comprising launching means (13) which are arranged to launch the particle (2) in its frozen form towards the target body (3,4) via a movement path (14) through a gap (15) between the launching means and the target body. The medium in the gap may have a temperature above the adhesive particle's melting temperature. The launching means may be arranged to launch the particle at a high speed. The launching means and the target body may have a geometry causing that the movement path is substantially vertical or substantially horizontal.
Abstract:
Conventionally the solder pads on the IC chip side surface (upper surface) of a package substrate are small (133-170 νm diameter) and occupy a relatively small metallic part, while the solder pads on the surface (lower surface) of a mother board are large (600 νm diameter) and occupy a large metallic part. According to the invention, the metallic part on the IC chip side of the package substrate is increased by forming a dummy pattern (58M) between the conductor circuits (58U), (58U) forming signal lines on the IC chip side of the package substrate, and the ratio of the metallic part of the IC chip side to that of the mother board side is adjusted. The package substrate does not warp during the manufacturing process and during the use thereof.
Abstract:
A printed circuit board and a method for manufacturing the same that facilitates the formation of an upper surface pattern and prevents a lower surface metal foil from being damaged when forming a blind via hole with a laser is provided. A lower surface and an upper surface of an insulative substrate (5) are respectively coated with a lower surface metal foil (220) and an upper surface metal foil (210), the thickness of which is less than that of the lower surface metal foil (220). Next, an opening (213) is formed in the upper surface metal foil at a location corresponding to a blind via hole formation portion (35) of the insulative substrate. A blind via hole (3), the bottom of which is the lower surface metal foil, is formed by emitting a laser (8) against the blind via hole formation portion (35) through the opening (213). Then, a metal plating film (23) is applied to the wall of the blind via hole (3), and an upper surface pattern (21) and a lower surface pattern (22) are formed through etching.