A printed circuit board is a level plane that holds electronic components.It typically has between two to ten layers which electrically connect components through copper pathways.The main system is usually called a motherboard, while the smaller ones are simply called boards or cards.
A printed circuit board is the board base for supporting and wiring the surface-mounted mechanisms in electronic devices. The printed circuit board is an etched circuit.A conductive copper foil is usually placed over a fiberglass or durable plastic base that is covered with a photoresist material.Light is directed through a negative image of the circuits, which hardens the areas that will remain after etching.The unhardened areas will be washed away when passed through an acid bath. The layers are glued together.
How did PCB technology emerge? It all started with the advent of wire wrapping, which made electronic parts more tightly connected and durable. As electronic parts became smaller, the cost of these components also began to lower down. Thus, PCBs were thrust into the limelight as electronics became a staple in many households and businesses worldwide.
During the first few decades of the 20th century, a patent for what was called a printed wire was made.In 1925, a certain Charles Ducas filed a revolutionary patent for creating an electrical path on an insulated surface. The concept worked and was used in gramophones and radios.
However, the history of printed circuit boards or PCBs can also be traced back to the 1940s.They were first used to connect discrete components. After the Second World War, Austrian engineer Dr. Paul Eisler made the first operational PCBs.In 1947, the first production of double-sided PCBs with plated through holes were realized.
In the 1950s, the materials used for boards were becoming lighter (such as various types of resin).In 1956, a patent was given to American scientists on behalf of the United States Army.It was under the name of The Process of Assembling Electrical Circuits. This involved the process of creating a printing plate for an offset printing press.The wire was then printed in acid-resistant ink.It was printed directly on the copper foil, and then etched by an acid solution.The 1960s saw the advent of multilayer PCB production.
By the 1970s, the size of the boards was starting to get smaller.This includes both the circuitry and the board itself.Hot air soldering processes also made their debut.Japanese engineers and developers also started to create screen methods that used various liquid photo imageable masks or LPIs.These became an industry standard for years.
By the 1980s, PCBs are able to hold big quantities of chips.Also, surface-mounted parts became the preferred choice.This led to further size reductions.In the 1990s, the cost of PCB materials went down despite the increasing complexity of modern boards and the decreasing size.This is mainly due to the continued used of multi-layer boards and the incorporation of rigid and flexible PCBs in a variety of electronic equipment and devices.High-Density Interconnect PCBs were produced in 1995.This was considered a new era in PCB production.
In 2000, the United States PCB market reached more than $10 billion.This was an unprecedented figure. In 2010, a new era of PCB production opened up again with the advent of Every Layer Interconnect production.The printed circuit boards of today can connect chips with minimal discrete components, with each chip holding up to hundreds of millions of transistors. PCB technology is still evolving, and it is rapidly growing.The future looks bright for the printed circuit board manufacturing and design sector. Miniaturization of electronic devices and equipment translates to denser boards with increased electronic proficiencies.