Abstract:
An electronic component mounting method that is to mount on a board 3 an electronic component 11 formed with solder bumps 16 on a lower surface thereof. Solder paste 19 is printed onto the electrodes 3a of the board 3 and further provided onto the solder bumps 16 by transfer. Thereafter, the solder bumps 16 are put on the electrodes 3a through the solder paste 19. Due to this, even where there is a gap between the solder bump 16 and the electrode 3a, the fused portion of solder is increased in amount by the solder ingredient of the solder paste 19 wherein the fused portion of solder is ensured to wettably spread. This can prevent a poor junction when to mount a thin semiconductor package by soldering.
Abstract:
A conductive paste capable of further reducing the electrical resistance of a conductive film or the like, a conductive film having an anisotropic conductivity, a plating method for forming a plated coating having a uniform crystal structure, and a method of producing a fine metal component having good characteristics. A conductive paste is such that metal powder in the form of many fine metal particles being linked in a chain form is blended. A conductive film is such that chain-form metal powder having paramagnetism is oriented in a constant direction by applying a magnetic field to a coating formed by the application of conductive paste. A plating method grows a plated coating by electroplating on a conductive film formed from a conductive paste. A method of producing a fine metal component which selectively grows a plated coating 4' on a conductive film 1 exposed at fine pass-hole pattern portions in a mold 3 to produce a fine metal component.
Abstract:
The cost and complexity of an electronic pressure sensitive transducer (20) are decreased by constructing such a transducer directly on a printed circuit board (22) containing support electronics. Conductive traces (24) are formed on the printed circuit board (22) to define a contact area (26). A flexible substrate (28) having an inner surface is positioned over the contact area (26). An adhesive spacer (34), substantially surrounding the contact area (26), attaches the flexible substrate to the printed circuit board (22). At least one resistive layer (32) is deposited on the flexible substrate (28) inner surface. In use, the resistive layer (32) contacts at least two conductive traces (24) in response to pressure applied to the flexible substrate to produce an electrical signal indicative of applied pressure.
Abstract:
The disclosed invention relates to materials and processes for creating particle-enhanced bumps on electrical contact surfaces through stencil or screen printing processes. The materials are mixtures of conductive ink, conductive paste, or conductive adhesive and conductive hard particles (104). The process involves depositing the mixture (108) onto electrical contact surfaces by stencil printing, screen printing, or other dispensing techniques (110). In another embodiment, the ink, paste, or adhesive deposit. Once cured (114), the deposition provides a hard, electrical contact bump on the contact surface with a rough, conductive, sandpaper-like surface that can be easily connected to an opposing contact surface without any further surface preparation of either surface.