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For the Inventor, By the Inventor

Nagano, Japan

Junhua Chang

USPTO Granted Patents = 19


Average Co-Inventor Count = 1.2

ph-index = 9

Forward Citations = 220(Granted Patents)


Location History:

  • Suwa, JP (1996)
  • Nagano-Ken, JP (2002 - 2006)
  • Nagano, JP (1995 - 2014)

Company Filing History:

goldMedal19 out of 33,404 
 
Seiko Epson Corporation
 patents

Years Active: 1995-2014

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19 patents (USPTO):Explore Patents
1. 8840228 - Liquid ejection head (2014-09-23),
2. 8449085 - Liquid ejection head (2013-05-28),
3. 8182074 - Liquid ejection head (2012-05-22),
4. 7997693 - Liquid ejection head (2011-08-16),
5. 7708388 - Liquid ejection head (2010-05-04),
6. 7265481 - Piezoelectric actuator and fluid ejection head having the same (2007-09-04),
7. 7140554 - Liquid ejection head (2006-11-28),
8. 7073878 - Liquid ejecting apparatus and controlling unit of liquid ejecting apparatus (2006-07-11),
9. 6824238 - Liquid jetting apparatus and method of driving the same (2004-11-30),
10. 6802589 - Liquid-jetting apparatus and method of driving the same (2004-10-12),
11. 6619777 - Liquid jet apparatus and method for driving the same (2003-09-16),
12. 6494556 - Liquid jetting apparatus, method of driving the same, and computer-readable record medium storing the method (2002-12-17),
13. 6471317 - Liquid jetting apparatus (2002-10-29),
14. 6450603 - Driver for ink jet recording head (2002-09-17),
15. 6431675 - Method of driving an ink jet printhead (2002-08-13),

Title: The Innovation Journey of Junhua Chang in Liquid Ejection Technology

Introduction

Junhua Chang, based in Nagano, Japan, is a prolific inventor with a remarkable portfolio of 19 patents. His contributions to the field of liquid ejection technology have significantly advanced how droplets are ejected at higher frequencies, fostering innovation in various applications such as printing technologies.

Latest Patents

Among his groundbreaking inventions is the liquid ejection head, which employs a multi-layer piezoelectric vibrator. This inventive design features an upper and a lower piezoelectric layer laminated together, facilitating efficient droplet ejection. A drive electrode located between these layers is electrically connected to a signal source, enhancing the ejection process. Moreover, the configuration includes an upper and a lower common electrode while optimizing the inertances of both the nozzle orifice and ink supply port to be greater than that of the pressure generating portion, ensuring superior performance.

Career Highlights

Junhua Chang's career is marked by his tenure at Seiko Epson Corporation, a leader in printer technology. His dedication to research and development in liquid ejection has positioned him at the forefront of technological advancements in the industry. With a keen focus on enhancing droplet frequency ejection, he has contributed to the overall efficiency and effectiveness of printing solutions.

Collaborations

Throughout his career, Chang has collaborated with noted colleagues such as Toshihisa Saruta and Kenichi Kanbayashi. These partnerships have enabled the sharing of expertise and drive towards innovative solutions, further amplifying the impact of their work within the company and the broader industry.

Conclusion

Junhua Chang's advancements in liquid ejection technology, exemplified by his innovative patents, underscore his role as a significant contributor to the field. His collaboration with talented coworkers and his affiliation with Seiko Epson Corporation have propelled his inventions to new heights, ensuring ongoing progress in liquid ejection systems for various applications. As industries continue to evolve, Chang's work will undoubtedly influence the future of technology in exciting ways.

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