摘要:
A multilayer through-hole contacted flexible circuit and method of manufacture thereof is presented. The flexible circuit is made by providing through-holes (58) to a standard single sided laminate (50). Conductive material (60) is vacuum deposited into the through-holes and at the same time a conductive seed-layer is deposited on the polymer side of the standard laminate. Plating resist (62) is applied to both sides of the material and the seed-layer side of the material is patterned such that circuit traces, pads, and through-holes can be electroplated with additional copper (64). The plating resist (62) is stripped and the very thin layer of copper in the non-conductive areas is flash etched to produce semi-additive circuit features on the seed-layer side. Etch resist is then applied to both sides of the material and circuit patterns fabricated on the foil-side of the material. A cover film (66) and (68) coated with adhesive (70) and (72) is then provided over the exposed circuit patterns.
摘要:
A circuit board electrical interconnection system, including improved, elongated, bodily-rotatable interconnect elements, is disclosed. Each element has tab portions projection angularly from the opposing ends of the element, which tab portions define a pair of pad engagement surfaces. The pad engagement surfaces engage corresponding contact pads on opposing surfaces of two circuit boards by means of elastic support member. The element is divided longitudinally, axially or laterally into a plurality of sectors. Some sectors are electrically conductive, while others have other electrically predetermined characteristics. The two types of sectors are arranged in an alternating patter. The non-conducting sectors may be comprised of insulative, resistive or capacitive materials.
摘要:
A fluoropolymeric circuit laminate consisting of one or more layers of fluoropolymer impregnated woven glass cloth (18) sandwiched between one or more layers (14,16) of "random" microfiberglass reinforced fluoropolymer is presented. This composite of fluoropolymer, woven glass fabric and random glass microfibers may be clad on one or both outer surfaces with a suitable conductive material (20,22) such as copper or certain known resistive foils.
摘要:
Un système connecteur électrique à haute fréquence pour l'interconnexion électrique de premier et second éléments de circuit correspondants comprend un premier réseau plan (14) de bornes de contact de type bloc disposées sur un substrat (11) et connectées à un premier circuit sur le substrat, conjointement avec une première structure de guidage (18) adjacente au premier réseau de bornes de contact. Un second réseau (40) de bornes de contact de type bloc est monté sur une structure de support de contact rigide non-conductrice (42) qui comprend un support de réseau de bornes de contact élastique (74), une structure de came (90) et une seconde structure de guidage (84, 86) coopérant avec la première structure de guidage. La structure de support de contact est couplée de manière élastique à une structure porteuse (44) qui comprend une structure de came (56) coopérant avec la première. Une structure d'interconnexion multiconducteur flexible (36) possède une extrémité connectée électriquement à un circuit électrique fixé sur la structure porteuse et son autre extrémité connectée à des bornes correspondantes du second réseau. Une structure d'attache (88) est adaptée pour fixer la structure porteuse et le substrat ensemble avec les structures de guidage par engagement. Lorsque la structure d'attache déplace la structure porteuse vers le substrat, les structures de came interagissent et déplacent la structure de support de contact latéralement (parallèlement au plan des réseau de contact) avec une action de came transversale, dirigée par les première et seconde structures de guidage engagées, pour enlever les débrits ou autres corps étrangers (tels que des films corrosifs) qui peuvent affecter le rendement du circuit électrique.
摘要:
A high temperature processing aid for melt processing polyimide polymers and a method of doing same wherein a pyrrolidone based high boiling point solvent is added to a polyimide polymer in amounts sufficient to lower the glass transition temperature of said polyimide.
摘要:
A photocurable composition for stereolithographic three-dimensional printing, wherein the photocurable composition comprises a photoreactive oligomer component comprising a hydrophobic oligomer comprising a photoreactive end group, a photoreactive monomer component comprising a photoreactive monomer having a photoreactive end group, and a photoinitiation composition comprising a photoinitiator; the photocurable composition has a viscosity of 250 to 10,000 centipoise at 22°C, determined using a Brookfield viscometer; and the photocured composition has a dielectric loss of less than 0.010, preferably less than 0.008, more preferably less than 0.006, most preferably less than 0.004, each determined by split-post dielectric resonator testing at 10 gigahertz at 23°C.