The development history and composition of Printed Flexible Circuit

A Printed Flexible Circuitis a special circuit composed of electronic components mounted on a flexible substrate. The substrate is usually a polymer material such as polyimide plastic, polyether ether ketone, or transparent conductive polyester. Features of Printed Flexible Circuit include lightweight, thin thickness, soft and bendable. So what is the development history and composition of the Printed Flexible Circuit? Let's take a look.

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Development History

Composition structure

Development History

After the telecommunications revolution in the 19th century, people entered the information age, and the brewing electronics industry is heading for a good start in the new century. The rapid expansion of the communications industry has created a huge demand for mass-produced circuits.

In 1903, Berliner Albert Hansen patented a "printed" circuit in the United Kingdom in response to the needs of telephone switching, manufacturing metal conductor patterns on a dielectric substrate. Although not a true "printed circuit" method, this appears to be the first recorded circuit invention. At the same time, Thomas Edison also mentioned in a written reply the method of drawing conductive traces on paper, including the selective application of polymer adhesives and conductive particles, which is the basis of modern polymer thick film technology. But there is no evidence that he put it into practice.

In 1913, Arthur Berry patented the fabrication of circuits using resist coating and etching metal methods; circa 1918, inventor Max Schoop commercialized it using a metal flame spray process; Charles Ducas then improved Etching and electroplating; a year later Frenchman Cesar Parolini came up with improvements in the field of electroplating additives; other inventors of that era also adopted the method of Printed Flexible Circuit. In 1923, Seymour officially entered the gap of flexible circuits by using a layered pattern made of printed graphite paste. He describes this circuit, using wax paper and eucommia glue as insulators and graphite, leads and copper as conductive pastes, as "can transport, propagate, modulate pulses along or across channels; flexible, relatively thin, pliable, and capable of being fabricated to withstand various forms" and was applied to a radio tuner. Franz first added conductive particles to polymer inks in 1933 and added a copper electroplating step to the process, a concept adopted by modern circuit manufacturers. In October 1947, Printed Flexible Circuit technology entered the commercial field.

Composition structure

In some cases, the Printed Flexible Circuit consists of five parts: flexible substrate, tape-shaped conductive copper foil, a thermosetting adhesive, surface insulating protective film, and reinforcement (which can be added as needed).

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