Abstract:
Electronic circuits (1, 101) are disclosed. The electronic circuits comprise a first and a second integrated circuit (10a, 110a, 10b, 110b) and a printed circuit board (PCB) (15, 115). The PCB comprises dielectric layers (30a-c, 130) of polymer-based materials having different dissipation factors arranged in accordance with various embodiments for suppressing noise.
Abstract:
L'invention concerne un procédé de fabrication d'une carte (ou ticket) à puce sans contact comportant les étapes suivantes: fabrication d'une antenne (12) consistant à sérigraphier des spires d'encre conductrice polymérisable sur une feuille de papier transfert et à faire subir à cette feuille de papier transfert un traitement thermique de façon à cuire et polymériser l'encre conductrice, connexion d'une puce (14), munie de plots de connexions, sur l'antenne (12), lamination consistant à solidariser la feuille de papier transfert avec une couche de matière plastique (16) constituant le support d'antenne, par pressage à chaud, de façon à ce que l'antenne sérigraphiée et la puce soit noyées dans la couche de matière plastique, décollage de la feuille de papier transfert, et lamination de corps de carte sur le support d'antenne, consistant à souder de chaque côté du support au moins une couche de matière plastique (18, 20), par pressage à chaud.
Abstract:
The invention relates to a method for defined mechanical drilling of electrical printed circuit boards or printed circuit board stacks. According to this method, an electrical signal for determining the final level of the drilling depth is obtained from the contact of the bit with a conductive layer (2). The method is characterised in that the conductive layer (2) concerned is part of a drilling support. In this way, the inventive method can be used for drilling through the printed circuit boards or printed circuit board stacks.
Abstract:
Process provides wetlaid printed wiring board core stock precursor material that incorporates resin within cellulose matrix and that can be partially cured by conventional means to form PWB B-stage materials (20). Process also provides for reducing dielectric constant and dissipation factor of a PWB core stock and of PWB composite material made therefrom, by incorporating material having dielectric constant lower than that of cellulose fibers directly into cellulose matrix forming the core stock (21). Among materials that can be incorporated into cellulose matrix are fibrous materials, including glass fibers (23) and/or synthetic fibers, and/or particulate constituents such as glass microspheres, glass beads, glass shot, aramid fibers, aramid powders, ceramic microspheres, and clay. Other additives, such as flame retardants, may also be incorporated into novel paperboard materials of the invention.
Abstract:
This invention relates to an apparatus and a process for uniformly laminating a conductor (18) to a substrate (15). The conductor can be a printed circuit; the substrate can be any dielectric. The apparatus comprises two platens (10, 11) containing cavities (12, 13). One of the cavities (13) contains a mold (14) which is the mirror image of a substrate surface. The other cavity (12) substantially contains the substrate (15). It can have two-dimensional or three-dimensional surfaces to which the printed circuit is laminated. The product results in a superior lamination of the printed circuit across the surface of the substrate.
Abstract:
1. A method for manufacturing a circuit board featuring conductive patterns, said method comprising the following steps of: i) affixing a conductive layer, such as a metal foil (3), to a substrate material (1) selectively, such that a part of the conductive layer, such as the metal foil (3), comprising desired areas (3a) for the final product and narrow areas (3c) between the final product's conducting areas, is affixed to the substrate material (1) by means of a bond (2), and removal-intended more extensive areas (3b) of the conductive layer, for example the metal foil (3), are left substantially unattached to the substrate material in such a way that the removable area (3b) is in attachment with the substrate material (1) by not more than its edge portion to be patterned in a subsequent step ii) and possibly by sites which preclude a release of the removable areas prior to a step iii); ii) patterning, by a removal of material, the conductive layer, such as the metal foil (3), from narrow gaps between the desired conducting areas (3a), and from an outer periphery of the area (3b) removable in a solid state, for establishing conductor patterns; iii) removing the removable areas (3b), not affixed to the substrate material (1), from the conductive layer, such as the metal foil (3), in a solid state after the conductive layer's edge area, which was removed from the removable area's outer periphery during the course of step ii), no longer holds the removable areas (3b) attached by their edges to the substrate material.
Abstract:
The present invention consists of the direct deposition over paper of electric and electronic elements, single or integrated, including at nano-scale. The deposition, by virtue of the materials and scale utilized, is furthermore transparent, which allows the application of the present invention in the domain of graphic arts. The deposition is executed at close-to-ambient temperatures, an in a less controlled environment than that of traditional deposition processes. Furthermore, the low cost of printing obtained allows for the application of electronic paper to large surfaces.
Abstract:
The invention relates to a method for defined mechanical drilling of electrical printed circuit boards or printed circuit board stacks. According to this method, an electrical signal for determining the final level of the drilling depth is obtained from the contact of the bit with a conductive layer (2). The method is characterised in that the conductive layer (2) concerned is part of a drilling support. In this way, the inventive method can be used for drilling through the printed circuit boards or printed circuit board stacks.