High-resolution long-array thermal ink jet printhead fabricated by anisotropic wet etching and deep Si RIE

Regan Nayve, Masahiko Fujii, Atsushi Fukugawa, Takayuki Takeuchi, Michiaki Murata, Yusuke Yamada, Mitsumasa Koyanagi

研究成果: Article査読

22 被引用数 (Scopus)


This paper describes the fabrication and characterization of a thermal ink jet (TIJ) printhead suitable for high speed and high-quality printing. The printhead has been fabricated by dicing the bonded wafer, which consists of a bubble generating heater plate and a Si channel plate. The Si channel plate consists of an ink chamber and an ink inlet formed by KOH etching, and a nozzle formed by inductively couple plasma reactive ion etching (ICP RIE). The nozzle formed by RIE has squeezed structures, which contribute to high-energy efficiency of drop ejector and, therefore, successful ejection of small ink drop. The nozzle also has a dome-like structure called channel pit, which contributes to high jetting frequency and high-energy efficiency. These two wafers are directly bonded using electrostatic bonding of full-cured polyimide to Si. The adhesive-less bonding provided an ideal shaped small nozzle orifice. Use of the same material (Si substrate) in heater plate and channel plate enables the fabrication of high precision long printhead because no displacement and delamination occur, which are caused by the difference in thermal expansion coefficient between the plates. With these technologies, we have fabricated a 1" long printhead with 832 nozzles having 800 dots per inch (dpi) resolution and a 4 pl. ink drop volume.

ジャーナルJournal of Microelectromechanical Systems
出版ステータスPublished - 2004 10

ASJC Scopus subject areas

  • 機械工学
  • 電子工学および電気工学


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