Abstract:
A flexible printed circuit may be provided with an integrated heat and pressure spreading layer. The heat and pressure spreading layer may be configured to uniformly spread heat and pressure from a bonding tool across a portion of the flexible printed circuit during bonding of the flexible printed circuit to additional circuitry. During manufacturing of the flexible printed circuit, a sheet of heat and pressure spreading material may be attached to a sheet of flexible printed circuitry and the heat and pressure spreading material and the sheet of flexible printed circuitry may be die cut to form multiple flexible printed circuits each with a heat and pressure spreading layer. An electronic device may be provided with a flexible printed circuit with a heat and pressure spreading layer coupled to a component such as a display.
Abstract:
There is provided a flexible metal laminate including a polymer resin layer including a polyimide resin of a specific structure and a fluororesin, wherein the fluororesin is more distributed through the inside of the polymer resin layer than at the surface of the polymer resin layer.
Abstract:
Terahertz metamaterials comprise a periodic array of resonator elements disposed on a dielectric substrate or thin membrane, wherein the resonator elements have a structure that provides a tunable magnetic permeability or a tunable electric permittivity for incident electromagnetic radiation at a frequency greater than about 100 GHz and the periodic array has a lattice constant that is smaller than the wavelength of the incident electromagnetic radiation. Microfabricated metamaterials exhibit lower losses and can be assembled into three-dimensional structures that enable full coupling of incident electromagnetic terahertz radiation in two or three orthogonal directions. Furthermore, polarization sensitive and insensitive metamaterials at terahertz frequencies can enable new devices and applications.
Abstract:
High-speed pluggable rigid-end flex circuit. A circuit includes a flexible section, rigid section, connector disposed on the rigid section, and electrically conductive signal transmission line electrically coupled to the connector. The flexible section includes a first portion of a flexible insulating layer. The rigid section includes a second portion of the flexible insulating layer and a rigid insulating layer disposed on the second portion of the flexible insulating layer. The connector is configured to form a pluggable conductive connection. The electrically conductive signal transmission line includes a first signal trace having a root mean square surface roughness below 20 micrometers and a filled signal via configured to pass through at least a portion of the rigid insulating layer. The flexible and rigid insulating layers have a dissipation factor equal to or below a ratio of 0.004 and a dielectric constant equal to or below a ratio of 3.7.
Abstract:
A method for reducing creep corrosion on a printed circuit board, the printed circuit board comprising a substrate, a plurality of electrically conductive tracks located on at least one surface of the substrate, a solder mask coating at least a first area of the plurality of electrically conductive tracks and a surface finish coating at least a second area of the plurality of electrically conductive tracks, the method comprising depositing by plasma-polymerization a fluorohydrocarbon onto at least part of the solder mask and at least part of the surface finish.
Abstract:
A metal-clad laminate, including metal foil, and a first resin layer arranged on the metal foil, the first resin layer including an epoxy resin and a fluoropolymer with a curable functional group. Also disclosed is a method of producing the metal-clad laminate.
Abstract:
In order to produce a carrier foil for printed circuit boards, which is particularly suitable for high component densities, it is proposed that said carrier foil be produced from a polymer material comprising a thermoplastically processable, substantially fully fluorinated plastics material.
Abstract:
A circuit substrate laminate, comprising a conductive metal layer; and a dielectric composite material having a dielectric constant of less than about 3.5 and a dissipation factor of less than about 0.006, wherein the dielectric composite material comprises: a polymer resin; and about 10 to about 70 volume percent of cenospheres having a ferric oxide content of less than or equal to 3 weight percent.
Abstract:
A multilayer printed wiring board includes a multilayered structure having conductor circuit layers and interlaminar insulative layers, the interlaminar insulative layers including an outermost interlaminar insulative layer, the conductor circuit layers including an outermost conductor circuit layer formed over the outermost interlaminar insulative, a filled-viahole formed in the outermost interlaminar insulative layer and having one or more metal plating fillings and completely closing a hole formed through the outermost interlaminar insulative layer such that the metal plating of the filled-viahole extends out of the hole and forms a substantially flat surface, and solder bumps including a first solder bump formed on the substantially flat surface of the filled-viahole and a second solder bump formed on a surface portion in the outermost conductor circuit layer. The substantially flat surface of the filled-viahole is leveled substantially at the same height as the surface portion of the outermost conductor circuit layer.
Abstract:
A plurality of conductor traces are formed on a porous base insulating layer made of porous ePTFE. Each conductor trace has a laminated structure of a seed layer and a conductor layer. A cover insulating layer is formed on the base insulating layer to cover each conductor trace. The ePTFE used as the porous base insulating layer has continuous pores. An average pore size of the ePTFE is not less than 0.05 μm and not more than 1.0 μm.