Abstract:
The invention provides a composition (3) comprising:(i) a ferrofluid comprising a colloidal suspension (4) of ferromagnetic particles in a non-magnetic carrier liquid, and(ii) a plurality of electrically-conductive particles (5) having substantially uniform sizes and shapes, dispersed in the ferrofluid.Various types of substantially non-magnetic electrically-conductive particles (5) are described. Application of a substantially uniform magnetic field by magnet means (8) to the composition (3) causes the electrically-conductive particles (5) to form a regular pattern (9). The composition is used for providing anisotropic conductive pathways (9a, 9b) between two sets of conductors (2a, 2b; 7a, 7b) in the electronics industry.The composition may be a curable adhesive composition which bonds the conductors. Alternatively or in addition the electrically-conductive particles may have a latent adhesive property e.g. the particles may be solder particles.The ferrofluid may be a colloidal suspension of ferromagnetic particles in a liquid monomer.
Abstract:
Electrical connection between electrode arrangements formed on first and second substrates is described. The first substrate is placed over the second substrate with a UV light curable adhesive between them. The UV light curable adhesive carries first and second particles dispersed therein. The first and second substrates are pressed against each other and exposed to UV light in order to harden the adhesive. The first particles are made from conductive particles and preferably resilient and function to form current paths between the electrodes of the first and second substrates. The second particles function to prevent the first particles from being destroyed by excess deformation.
Abstract:
A liquid crystal device and a manufacturing method thereof are described. The device comprises a liquid crystal panel and an auxiliary panel formed with an IC circuit for supplying driving signals to the liquid crystal device. The auxiliary substrate is separately provided with the circuit and the function thereof is tested in advance of the assembling with the liquid crystal panel. By this procedure, the yield is substantially improved.
Abstract:
A connection electrodes producing method has a step of forming resin layer which can be softened after hardened, on a circuit substrate on which an electrode pattern is formed. Then, only the resin layer material on the electrode pattern is cured and left. Thereafter, conductive particles are adhered to only the resin layer on the electrode pattern by softening the resin layer and by scattering the conductive particles on the circuit substrate with the softened resin layer.
Abstract:
An anisotropically conductive adhesive composition (10) for use in electrically connecting at least one conductive area (14) on one substrate (12) with at least one conductive area (20) on a second substrate (18) is disclosed. The composition (10) is comprised of a mixture of conductive particles and a nonconductive adhesive binder (26). The conductive particles are dispersed throughout the binder in a plurality of noncontiguous conductive units (24) such that, upon applying a layer (30) of the composition (10) over both the conductive and insulating areas (14, 16) on one substrate (12) and positioning in a conducting relationship and adhering said at least one conductive area (20) on the second substrate (18) with said at least one conductive area (14) on the first substrate (12), the units (24) establish electrical connection between the adhered conductive areas (14, 20) on the two substrates (12, 18). The units (24) are sufficiently spaced apart, however, to preclude electrical conductivity between adjacent areas on the same substrate. A method for electrically connecting conductive areas on two substrates by means of said anisotropically conductive adhesive composition (10) and products produced by said method are also disclosed.
Abstract:
Embodiments of the invention provide a copper clad laminate, and more particularly, to a copper clad laminate and a method for manufacturing the same capable of increasing a peel strength by adding a stress relaxation filler to an insulating layer of a copper clad laminate, along with an inorganic filler. To improve an adhesion of a substrate, the stress relaxation filler is distributed into the resin, along with the inorganic filler, and is entirely distributed into the varnish, and is more effectively added to the vicinity of a bonded interface between the insulating layer and the copper clad layer, thereby improving the overall adhesion.
Abstract:
A light source and method for making the same are disclosed. The light source includes a plurality of surface mount LEDs that are bonded to a mounting substrate by a layer of asymmetric conductor. Each LED has surface mount contacts on a first surface thereof and emits light from a second surface thereof that is opposite the first surface. The mounting substrate includes a top surface having a plurality of connection traces. Each connection trace includes an n-trace positioned to underlie a corresponding one of the n-contacts and a p-trace positioned to underlie a corresponding one of the p-contacts, the p-trace having an area greater than the p-contact. The layer of asymmetric conductor is sandwiched between the surface mount contacts and the connection traces, and can optionally extend into the spaces between the LEDs to provide a scattering medium for redirecting light leaving the sides of the LEDs.
Abstract:
Disclosed herein are anisotropic conductive particles contained in anisotropic conductive adhesive films which can be used in circuit board mounting applications. The conductive particles have a uniform shape, a narrow particle diameter distribution, and appropriate compressive de-formability and recoverability from deformation. In addition, the conductive particles exhibit enhanced conducting properties without being ruptured when interposed and compressed between connection substrates, thereby achieving a sufficient contact area between the particles and the connection substrates. Further disclosed are polymer-based particles used in the conductive particles.
Abstract:
A method for connecting an electronic part, which contains: mixing a dispersing solvent, an adhesive resin which is dissolved in the dispersing solvent, conductive particles, and insulating particles which have smaller particle diameters than those of the conductive particles so as to prepare an anisotropic conductive adhesive; placing a terminal of a substrate and a terminal of an electronic part so as to face each other via the anisotropic conductive adhesive, and applying heat and pressure to the substrate and the electronic part so as to sandwich the conductive particles between the terminal of the substrate and the terminal of the electronic part to thereby deform the conductive particles, in which the pressure is smaller than pressure at which the conductive particles are destroyed, and smaller than pressure at which the particle diameters of the conductive particles become equal to the particle diameters of the insulating particles.
Abstract:
In an anisotropic conductive adhesive containing a conductive particle, the conductive particle includes a resin particle that is provided with a cavity formed therein and a conductive layer surrounding a surface of the resin particle. The cavity is formed by mixing the resin particle with a reactant and partially removing the reactant from the resin particle. Thus, the conductive particle may readily absorb an external pressure, thereby providing an improved malleability to the conductive particle.