The History of Flexible Circuits

Flexible circuits are not new to the world of electronic interconnections. The innovation has a remarkably lengthy and rich record. Patents issued at the turn of the 20th century program clear proof that early researchers thought that level conductors sandwiched in between layers of shielding product might alleviate the layout of particular primitive sorts of electrical circuits in very early telephone systems switching applications (British Pat- ent No. 4681, 1903). Some really renowned turn-of-the-century researchers and also scientists apparently spun their ideas to unique methods for producing electric affiliations. Based on notes in one of Thomas Edison's laboratory publications, it shows up that he visualized the flexible circuit's forerunner. In the notebook, Edison replied to a concern from his apprentice, Frank Sprague, regarding just how one could place conductors on shielding products. One of Edison's sugges- tions was to make use of conductor patterns of graphite powder in cellulose periodontal put on linen paper. There is not proof that Edison's recommendation was implemented, however the concept is close in idea to polymer thick movie circuits these days that prevail in a large range of applications.

Considerable production and also usage of flexible circuit technol- ogy in electronic or electric applications seem to have been postponed until flexible circuits were pressed into service throughout


The second world war. At the time, German researchers were using flat conductor electrical wiring uses both in the weapon turrets of tanks and in the V2 rocket. United States flex circuit leader Pat Bryan, relevant the story that a captured V2 rocket utilized by US space program scientists in the very early 1950s was the

resource of at the very least a part of flex technology used in the US. Bryan, then helping Lockheed, took an item of the circuit back to California to research and also eventually utilize in aerospace items.

An additional important development happened on the eastern coast of the United States in the same period. Via the initiatives of Victor Dahlgren and business owner Royden Sanders, Sand- ers Associates in New Hampshire made significant strides, de- veloping processes for printing and etching flat conductors on flexible base materials to change cable harnesses. Later, dealing with Sidney Tally as well as Thomas Stearns, Dahlgren likewise helped to patent and also define exactly what is possibly the initial rigid flex circuit (fig. 2-1). It is hard to identify exactly when and where flexible modern technology was born in the United States; however, it is evident from advertisements of that period that Photocircuits in New York was supplying a minimum of the concept of steel circuits on flexible base material