Epson inkjet technology used to fabricate world's first ultra-thin multilayer circuit board

Epson inkjet technology used to fabricate world's first ultra-thin multilayer circuit board
 
Seiko Epson Corporation ("Epson") this week announced that it has succeeded in leveraging its proprietary inkjet technology to develop what the company believes is the world's first ultra-thin 20-layer circuit board.

Multilayer circuit boards are normally produced by using a photolithography process to pattern a copper foil bonded to a base board. However, the industry has struggled to produce thin, lightweight, high-density multilayer circuit boards cheaply because the traditional process requires (1) thick copper layers; (2) the creation of a different photomask for each layer; (3) a complex step for forming through-holes to electrically connect different layers; and (4) a large volume of photoresist, developer, etchants, stripping agents and other chemicals.

Against this backdrop, Epson received a grant from the New Energy and Industrial Technology Development Organization (NEDO), an independent Japanese governmental agency, to develop technology for fabricating circuit boards using inkjet technology. The goal of the three-year project, which was launched in June 2003, is two-fold: dramatically reduce the energy consumed in the manufacture of circuit boards; and fabricate small, lightweight, high-performance circuit boards used in end-products such as information and communications equipment, thus helping to bring about the realization of a ubiquitous computing society.

Epson recently succeeded in producing a 20-layer circuit board sample by using an inkjet system to alternately "draw" patterns and form layers on the board using two types of ink: a conductive ink containing a dispersion of silver micro-particles measuring from several nanometers to several tens of nanometers in diameter, and a newly developed insulator ink.

An inkjet-based manufacturing process has many advantages over a traditional photolithography process: (1) it uses a far lower volume of materials, since patterns are formed only in areas where they are needed, not over the entire substrate; (2) it is a dry process, so virtually no liquid waste is created; (3) it involves fewer steps, and thus consumes comparatively little energy; (4) it is readily adapted to high mix, low volume production, since no masks are used; and (5) it is well suited to multilayer structures, since interlayers can also be patterned directly onto the board. An inkjet-based process thus enables low-cost, high-density multilayer circuit boards to be produced via a green manufacturing process with a light environmental load.

Epson is leading the way toward making this inkjet technology the de facto standard in circuit board fabrication, to help boost the performance and reduce the size and weight of future electronic devices such as information and communications equipment.

About Epson
The Epson Group increases its corporate value through its innovative and creative culture. Dedicated to providing its customers with digital image innovation, its main product lines comprise information-related equipment such as printers and projectors, electronic devices including displays, liquid crystal panels for projectors, semiconductors and quartz devices, and precision products such as watches. Epson products are known throughout the world for their superior quality, functionality, compactness and energy efficiency.

The Epson Group is a network of 84,899 employees in 110 companies around the world, and is proud of its ongoing contributions to the global environment and to the communities in which it is located. Led by the Japan-based Seiko Epson Corp., which is listed on the First Section of the Tokyo Stock Exchange, the Group had consolidated sales of 1,413 billion yen in fiscal 2003.

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Seiko Epson Corp.
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