Abstract:
A method for manufacturing a printed circuit board. The method includes: preparing a printed wiring board, the printed wiring board comprising through holes and a plurality of electrode pads; coating surfaces of the plurality of electrode pads and surfaces of the through holes on an one side of the printed wiring board with a bonding material; mounting a semiconductor package on the printed wiring board such that a plurality of bumps on a surface of the semiconductor package corresponds to the plurality of electrode pads; bonding the bumps to the electrode pads by heating the printed wiring board on which the semiconductor package is mounted; and filling a space between the semiconductor package and the printed wiring board with a filler material.
Abstract:
The invention provides an electronic apparatus having a metal core substrate including a metal plate, an insulating layer formed on the metal plate and a conductive layer formed on the insulating layer, and an electronic part, and to which the conductive layer and a terminal of the electronic part are connected. In the electronic apparatus, a member having a high thermal conductivity is arranged so as to be in contact with both of the metal plate and the electronic part. Accordingly, a heat radiating property of the electronic apparatus is increased.
Abstract:
Methods of forming a conductive via in a substrate include contacting the substrate with a wave of conductive liquid material, such as molten solder, and drawing the liquid material into the aperture with a vacuum. The wave may be formed by flowing the liquid material out from an outlet in a direction generally against the gravitational field. The liquid material may be solidified to form an electrically conductive structure. A plurality of apertures may be selectively filled with the liquid material one at a time, and liquids having different compositions may be used to provide conductive vias having different compositions in the same substrate. Systems for forming conductive vias include a substrate fixture, a vacuum device having a vacuum fixture, and a solder dispensing device configured to provide a wave of molten solder material. Relative lateral and vertical movement is provided between the wave of molten solder and a substrate supported by the substrate fixture.
Abstract:
A fiber optic module has a PCB with high frequency tracks. The PCB is housed within a housing having top and bottom parts, each having a series of metallized ridges. The PBC has through holes filled with solder. Thus, there is a series of electrical interconnections through the PBC, and the total length of any enclosed periphery is much shorter than the full periphery of the board so that high frequencies are attenuated.
Abstract:
A substrate having many via contact means disposed therein. Each of the via contact means is composed of a via hole, as a through-hole, formed in the substrate, a metal film disposed on the inner peripheral surface of the via hole, and a solder filled into the cavity defined by the metal film.
Abstract:
A semiconductor package with improved solder joint reliability, and a method of fabricating the same are provided. The semiconductor package comprises a printed circuit board (PCB) having a plurality of interconnection layers formed on its surface, and having a plurality of through holes connected to the interconnection layers. An adhesive member is attached to an upper surface of the PCB, and a semiconductor chip is electrically connected to the interconnection layers and mounted on an upper surface of the adhesive member. A solder connecting part fills each through hole so as to form a mechanically strong connection that is resistant to breakage during thermal transients and physical impacts.
Abstract:
The invention provides an electronic apparatus having a metal core substrate including a metal plate, an insulating layer formed on the metal plate and a conductive layer formed on the insulating layer, and an electronic part, and to which the conductive layer and a terminal of the electronic part are connected. In the electronic apparatus, a member having a high thermal conductivity is arranged so as to be in contact with both of the metal plate and the electronic part. Accordingly, a heat radiating property of the electronic apparatus is increased.
Abstract:
Terminal electrodes 9 for carrying a high frequency device 3 are formed on a surface of a circuit board having its reverse surface covered with a reverse surface conductor layer 6, and a plurality of signal lines 2 for exchanging a signal between the high frequency device 3 and an external circuit are formed thereon. The terminal electrode 9 is arranged at the center of the circuit board, and the signal lines 2 radially extends from the terminal electrode 9. Electromagnetic interference between the signal lines 2 can be reduced, so that out-of-band attenuation characteristics and isolation characteristics can be satisfactorily exhibited in a case where the high frequency device 3 is a duplexer.
Abstract:
A circuit board with vias that are suitable for use as test pads can be made according to a method whereby a first end of a via is blocked prior to heating solder paste that covers the opposite end of the via. As a result, air is trapped in the via when the solder paste is heated, which prevents melted solder paste from flowing in. Instead, the solder paste forms a dome shaped test pad over the via, which facilitates contact with the test probe. When applied to OSP circuit boards, the result is an OSP board with at least via that has a blocking material at one end and a solder dome over the opposite end.
Abstract:
Second individual electrodes are formed and arranged in zigzag in two rows on one surface of a flexible sheet, and wirings connected to the second individual electrodes are arranged to pass between adjacent second individual electrodes of the other row. Formed on the other surface of the flexible sheet are electrode connection sections to be connected to the second individual electrodes through through-holes going through the flexible sheet. The electrode connection section has an area larger than the second individual electrode and is connected to an external electrode through solder.