Abstract:
A method for waterproofing a device and the resulting device are provided. The device includes a printed circuit board assembly (PCBA), which includes a printed circuit board, and at least one electronic component disposed on the printed circuit board. A waterproof coating such as a polymer coating is disposed on or in contact with at least one portion of the at least one electronic component. A nanofilm is disposed on the PCBA. The nanofilm includes an inner coating and an outer coating. The inner coating is disposed on the printed circuit board or in contact with the waterproof coating. The inner coating comprises metal oxide nanoparticles having a particle diameter in a range of about 5 nm to about 100 nm. The outer coating in contact with the inner coating, and comprises silicon dioxide nanoparticles having a particle diameter in a range of 0.1 nm to 10 nm.
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 multilayer circuit substrate for multi-chip modules or hybrid circuits includes a dielectric base substrate, conductors formed on the base substrate and a vacuum deposited dielectric thin film formed over the conductors and the base substrate. The vacuum deposited dielectric thin film is patterned using sacrificial structures formed by shadow mask techniques. Substrates formed in this manner enable significant increases in interconnect density and significant reduction of over-all substrate thickness.
Abstract:
A metal-ceramic composite substrate having excellent heat dissipation and a method of manufacturing such a metal-ceramic composite substrate at low cost are disclosed. A metal-ceramic composite substrate (10) comprises a metal substrate (11) having front and rear surfaces, a ceramic layer (12) formed on each of the front and rear surfaces of the metal substrate (11), an electrode layer (13) formed on each ceramic layer (12) and a solder layer (14) formed on each electrode layer (13). Each ceramic layer (12) is in the form of a thin film of a ceramic.
Abstract:
An interposer 10 is constructed with a substrate body 12 having first and second through-holes 14,16, a capacitor 20 formed by a laminating dielectric layer 24 and a second electrode portion 26 on a first electrode portion 22, which is structured on inner surfaces of first and second through-holes 14,16 and on the first surface of the substrate body 12. An insulation layer 18 is formed by filling insulation material in the space within the first through-hole 14 surrounded by second electrode portion 26, and a first post 40 passes through the insulation layer 18, one end being electrically connected to the first electrode portion 22, while the first post 40 is electrically insulated from the second electrode portion 26. Furthermore, a second post 42 is formed in the second through-hole 16, and is connected to the second electrode portion 26 at its peripheral surface while being electrically insulated from the first electrode portion 22.