Abstract:
A method for fabricating electrical component assemblies includes the steps: (a) providing a first electrode and a first electrical component and locating the electrode in a recess formed by the component to produce a first laminate subassembly, (b) providing a second electrode and a second electrical component and locating the electrode in a recess formed by the second component to produce a second laminate sub-assembly, and (c) locating said two sub-assemblies in mutually stacked relation, thereby to form a resultant assembly. The components are typically provided by deposition on the electrodes and to protrude edgewise thereof beyond selected edges of the electrodes, thereby to form electrical contacts, and said locating of the sub-assemblies is carried out to cause said contacts to protrude in at least two different directions from the resultant assembly. The component typically consist of dielectric material, and the electrodes are typically deposited in the form of electrically conductive ink.
Abstract:
An electronic printed circuit is produced by firstly forming an electric resistance layer on an insulating substrate at positions where resistors and conductive portions of the printed circuit are expected to be provided, and then applying a layer of electrically conductive substance over the electric resistance layer thus formed, at positions where the terminals and the conductive portions of the printed circuit are to be provided.
Abstract:
A metal foil, of a metal such as aluminum, is held in place over the drilling entry surface of a circuit board to be drilled. The drill thus first enters the foil which acts as a shield which takes burrs, pressure foot marks and particle marks which would otherwise be imparted to the surface of the circuit board. Further, the foil provides an even surface for the drill entry which tends to minimize drill wander and resultant hole mis-alignment which could occur if initial entry were to be made at the circuit board surface which is often uneven. After drilling has been completed, the foil is removed.
Abstract:
A process for the production of laminates composed of sheets made of cellulose and glass fibers by pre-treating the sheets with a melamine resin or a methylol group-rich phenolic resin, impregnating the pre-treated sheets with a thermosetting resin and then laminating the impregnated sheets to produce the laminates. In one embodiment, the laminates are covered with a resin-treated glass fabric on at least one of the outermost surfaces or are further covered with a copper foil on the glass fabric-covered surface.
Abstract:
The disclosed laminate is suitable for use in the art of printed circuitry and comprises an electrically conductive layer and a nonwoven backing layer. The nonwoven backing has unusual dimensional stability under a wide variety of conditions and preferably comprises a blend of at least 15 wt. % polyester staple and at least 10 wt. % aromatic polyamide staple. This blend is impregnated with a thermosettable resin.
Abstract:
AN INDUSTRIAL LAMINATE SURFACE ON ONE SIDE WITH A COPPER FOIL AND ON THE OTHER SIDE WITH A WHITE PIGMENTED FILM OF ADHERABLE POLYVINYL FLUORIDE BETWEEN WHICH LAYERS THERE ARE A PLURALITY OF PAPER LAYERS AND GLASS SCRIM CLOTH LAYERS EACH OF WHICH HAVE BEEN IMPREGNATED WITH A PUNCHING STOCK THERMOSETTING PHENOLIC RESIN.
Abstract:
Circuits including conductors and impedance elements are printed on paper. Component values are maintained within acceptable limits of variation by correlated selection of substrate porosity and ink to produce a high degree of absorption of the liquid ink vehicle into the porous substrate while producing relatively little penetration of the pigment. Resistance values are lowered, and their reliability and consistency greatly improved, as compared with printing on either impermeable or excessively porous substrates.
Abstract:
The invention concerns a method of removing encapsulating material from encapsulated particles deposited onto a substrate. According to the method, a substrate is used which is capable of facilitating said removal of encapsulating material. The particles may be nanoparticles. In particular, the substrate-facilitated removal may result in sintering of the particles. The invention provides a novel way of functionalizing electronic structures using particulate matter and for conveniently producing e.g. printed electronics devices.