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Flexible Circuit Technology
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Flexible Circuit Technology THIRD EDITION by Joseph Fjelstad Th is is the Th ird Edition of Flexible Circuit Technology—an updated and signifi cant expansion over the previous editions. Achieving thirdedition status based on demand extends credence that fl exible circuits are of continuing value and enduring interest. Recalled here is the opening sentence to the very fi rst edition: “Th e fl exible circuit has been at the head of a quiet revolution in the world of electronic packaging, a revolution that has gone largely unnoticed, lost in the excitement of continued advances in semiconductor technology.” Much has changed in the decade since those words were fi rst written for this book. Flexible circuit technology is now squarely in the sights of circuit designers around the globe and, even with the bursting of the dot com bubble, it has held fast and, in fact, the fl ex circuit market actually grew while other interconnection-technology markets receded. Flexible circuits are now a key enabling technology for products ranging from simple consumer goods to spacecraft . Th ey are critical elements in such diverse products as medical equipment, keyboards, hard disk drives, printers and cellular phones. Every day, fl exible circuit technology opens doors to new opportunities for engineers and product and system designers to make a complete transition to the third dimension of interconnection. Short of wireless interconnections, fl exible circuits also continue to provide the very best and most practical solutions to interconnecting electronic elements that must move relative to each other. Th ese two important features — motion and three-dimensional interconnection — remain at the top of the list of key attributes of fl exible circuits; however, there is much more on the horizon and more yet to come in the years beyond, with fl exible circuit technology now opening new doors to the realm of high speed in the budding era of higher performance at reduced power While there is no universal solution in the world of electronic interconnections, fl exible circuits come closer to being such than all others. Th e diversity of fl ex circuit applications remains bound more by the limits of the engineer’s imagination than by any other single factor. Flexible circuit technology requires a good foundation of understanding in order to gain the greatest benefi t from its use. Materials and processes must be understood, and design rules followed, if success is to be enjoyed consistently. Th us, the purpose of the authors, in this third edition of this book on fl exible circuit technology, remains unchanged from the fi rst edition—that is, to provide the reader with a solid foundation on which the practitioner can build their skills and understanding. Th is edition is signifi cantly expanded over earlier editions and takes advantage of advances in technology to provide the user with much more information than before. While more complete than earlier editions, this eff ort still does not represent itself to be an exhaustive treatise of the subject. Indeed, with a technology that moves as rapidly as fl ex, the best one can hope to do is to write about the state of the technology up to the moment of publication, aft er which time the text begins to drift into technology history. Nevertheless, this book is believed to be properly comprehensive and it is hoped that it provides an engaging introduction to the world of fl exible circuitry. As with previous editions, readers are advised to access the various design standards and specifi cations described and referenced in this text to complete their fl ex circuit reference library. In addition, many fl ex circuit suppliers have design guides specifi c to their processing capabilities that will oft en prove of value. Such additional materials will serve well to fi ll whatever gaps readers may experience in this book. If you are new to fl exible circuits, you will no doubt fi nd the fi eld a rewarding one. Finally, readers are invited to send comments and suggestions as to how the book might be improved, for the better to serve the needs of future edition readers. Joseph Fjelstad September 2006 [ Last edited by sdlj8051 on 2007-1-17 at 00:26 ] |
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