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Headquartered in Hong Kong, , with its office in Shenzhen, China, Sbright Development (HK) Limited is a professional company which focuses on LED display: indoor and outdoor and its components: oval LED lamps, LED modules, masks (sunshades), driving IC, PCB board, video processor, control system, power modules etc.
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Items:
indoor: PH6mm, 7.62mm, 10mm, 12mm, 14mm...
outdoor: PH10mm, 12mm, 16mm, 20mm, 25mm...
Introduction:
A printed circuit board, or PCB, is used to mechanically support and electrically connect electronic components using conductive pathways, or traces, etched from copper sheets laminated onto a non-conductive substrate. Alternative names are printed wiring board (PWB),and etched wiring board. A PCB populated with electronic components is a printed circuit assembly (PCA), also known as a printed circuit board assembly (PCBA).
PCBs are rugged, inexpensive, and can be highly reliable. They require much more layout effort and higher initial cost than either wire-wrapped or point-to-point constructed circuits, but are much cheaper and faster for high-volume production. Much of the electronics industry's PCB design, assembly, and quality control needs are set by standards that are published by the IPC organization.
Materials:
Conducting layers are typically made of thin copper foil. Insulating materials have a wider scale: phenolic paper, glass fibre and different plastics are commonly used. Usually PCB factories use prepregs (short for preimpregnated), which are a combination of glass fibre mat, nonwoven material and resin. Copper foil and prepreg are typically laminated together with epoxy resin. Well known prepreg materials used in the PCB industry are FR-2 (Phenolic cotton paper), FR-3 (Cotton paper and epoxy), FR-4 (Woven glass and epoxy), FR-5 (Woven glass and epoxy), FR-6 (Matte glass and polyester), G-10 (Woven glass and epoxy), CEM-1 (Cotton paper and epoxy), CEM-2 (Cotton paper and epoxy), CEM-3 (Woven glass and epoxy), CEM-4 (Woven glass and epoxy), CEM-5 (Woven glass and polyester). Other widely used materials are polyimide, teflon and some ceramics.
A PCB as a design on a computer (left) and realized as a board assembly with populated components (right). The board is double sided, with through-hole plating, green solder resist, and white silkscreen printing. Both surface mount and through-hole components have been used. |
