Abstract:
An improved wear resistant bump contact (Fig. 1, item 16) is produced by the inclusion of small particles (18) of hard materials in the conductive material of the contact bump, preferably by co-deposition at the time of electroplating of the bump bulk material. Desirable attributes of the small particles of hard material include small particle size, hardness greater than the hardness of the bulk material of the contact bump, compatibility with the plating conditions, and electrical conductivity. In one variation, the bump of metal-particle co-deposited material is coated by a thin cap layer (19) of noble, non oxidizing metal to prevent electrical erosion by arcing as contact is made and broken from the pad.
Abstract:
A method and apparatus for testing unpackaged semiconductor dice includes a mother board (10) and a plurality of interconnects (12) mounted on the mother board (10) and adapted to establish a temporary electrical connection with the dice (14). The interconnects (12) can be formed with a silicon substrate (20) and raised contact members (16) for contacting the bond pads (22) of a die (14). Alternately the interconnects (16) can be formed with micro bump contact members (16) mounted on an insulating film (74). The mother board (10) allows each die (14) to be tested separately for speed and functionality and to also be burn-in tested in parallel using standard burn-in ovens. In an alternate embodiment testing is performed using a mother board/daughter board arrangement. Each daughter board (82) includes interconnects (12) that allow the dice (14) to be tested individually for speed and functionality. Multiple daughter boards (82) can then be mounted to the mother board (10) for burn-in testing using standard burn-in ovens.
Abstract:
A method and apparatus for testing unpackaged semiconductor dice includes a mother board (10) and a plurality of interconnects (12) mounted on the mother board (10) and adapted to establish a temporary electrical connection with the dice (14). The interconnects (12) can be formed with a silicon substrate (20) and raised contact members (16) for contacting the bond pads (22) of a die (14). Alternately the interconnects (16) can be formed with micro bump contact members (16) mounted on an insulating film (74). The mother board (10) allows each die (14) to be tested separately for speed and functionality and to also be burn-in tested in parallel using standard burn-in ovens. In an alternate embodiment testing is performed using a mother board/daughter board arrangement. Each daughter board (82) includes interconnects (12) that allow the dice (14) to be tested individually for speed and functionality. Multiple daughter boards (82) can then be mounted to the mother board (10) for burn-in testing using standard burn-in ovens.
Abstract:
Electrolytic and electroless processes which use a solid plug of polymer thick film composition to fill throughholes and composition therefor. The composition comprises a trimodal conductive mixture dispersed in an organic vehicle wherein the trimodal conductive mixture consists of particles of spherical silver, flake silver and silver-coated copper.
Abstract:
It is to provide a multilayer printed circuit board having excellent resolution, interlaminar insulation property and resistance to cool-heat shock without forming unevenness on the surface and lowering peel strength even if the thickness of the resin insulating layer is thin. The invention proposes a multilayer printed circuit board comprising an upper conductor circuit layer, a lower conductor circuit layer and a resin insulating layer electrically insulating both the conductor circuit layers, in which the resin insulating layer is a composite layer comprised of an insulating layer made from a heat-resistant resin hardly soluble in acid or oxidizing agent as a lower layer and an adhesive layer for electroless plating made from a heat-resistant resin as an upper layer, and if necessary, a resin is filled in a concave portion created between conductor circuits of the lower layer so as to render the surface into the same plane as the surface of the conductor circuit.
Abstract:
The invention relates to a method of manufacturing a pattern of conductors (10) on a polyimide base (1). After the conductors (11) have been formed in known manner ridges (21) of an insulating material are formed in the metal-free zones by applying, exposing and developing a UV-sensitive resist. Subsequently, metal is deposited on the conductors (11), the ridges (21) preventing short-circuits.
Abstract:
A process for the metalization of substrates is disclosed. The metal either forms a coating over the entire substrate, or it is patternwise deposited on the substrate surface. Metal is patternwise formed on the substrate either by forming a pattern of resist material on the substrate and depositing the material in the interstices defined by the pattern or by forming a patterned resist layer over a metal layer and transferring the pattern into the substrate using conventional techniques. The patterned resist layer is formed on the substrate using conventional techniques. The substrate is treated with reagents that promote the electroless plating of metal on the substrate surface. If the resist material has been previously formed on the substrate surface, the substrate surface is then dried. The remaining resist is then removed from the substrate surface. The substrate surface is then exposed to an electroless plating bath to form nickel onto those portions of the substrate surface that were treated with the sensitizing and activating solutions. The substrate is then heated to at least 180°C. Additional layers of metal are formed on the substrate. After the additional layers are so formed, the substrate is again heated to a temperature of at least about 180°C after each layer is so formed.
Abstract:
A picture display device comprises two supporting plates (1, 2) which enclose an electro-optical layer (5). One of the two supporting plates (1) is provided with a plurality of at least substantially transparent picture electrodes (74), while the other supporting plate (2) comprises at least one counter electrode (9). The picture electrodes (74) are connected to respective contact faces (12) by means of at least substantially transparent conductor tracks (11), on which contact faces a semiconductor driving device (13) is arranged. Outside the area of the electro-optical layer (5) at least the ends of the conductor tracks (11) are provided with a metallic top coating (17) which extends to the proximity of the associated contact face (12). To suppress resistance variations in the conductor tracks with respect to each other and from device to device, the metallic top coating (17) continues in the direction of the contact face (12) in a form (of, for example, a relatively narrow metal track (18)) which extends across the contact face (12) but covers only a part thereof. To manufacture such a picture display device by means of the method according to the invention, a deposition mask (25) is provided on the conductor tracks, which mask leaves clear a comb-shaped pattern (23) having teeth (24) which are narrower than the conductor tracks. At least one of the teeth (24) extends at the location of an end of the conductor track (11) and an associated contact face (12). While masking the deposition mask (25), metal is selectively deposited on the conductor track.
Abstract:
A chip carrier according to the present invention includes: a carrier body including an upper face, a lower face, and an internal conductor; and a plurality of terminal electrodes formed on the upper face of the carrier body, the plurality of terminal electrodes electrically connecting an LSI chip to the internal conductor. A plurality of concave portions for electrically connecting a plurality of electrodes on a circuit substrate to the internal conductor are provided on the lower face of the carrier body, the concave portions being electrically connected to the internal conductor.
Abstract:
In order to reduce the costs of assembled printed circuit boards, a printed board fuse (1) has been developed, which functions with great reliability at low manufacturing costs. By coating a large area of a printed board with metal, for example, by plating, a well-defined thickness of a metal layer (9) may be achieved in which a fuse (3) has been separated. The well-defined thickness also allows well-defined geometry of the fuse cross-sectional area and fuse length to be achieved and therefore its resistance and interruption characteristics will also be very accurately defined. In case of a temperature rise, the metal layer (9) surrounding the fuse (3) will have a heat dissipating effect on the fuse, implying an essentially reduced risk of board fire.