Yukihisa Koizumi

Title: Innovations of Yukihisa Koizumi

Introduction

Yukihisa Koizumi is a notable inventor based in Ebina, Japan. He has made significant contributions to the field of ink-jet technology, holding a total of 3 patents. His work primarily focuses on enhancing the performance and efficiency of ink-jet printing systems.

Latest Patents

Koizumi's latest patents include a thermal ink-jet head and recording apparatus. This invention features a channel wafer with multiple nozzle flow channels and a common ink reservoir. The design incorporates pits that communicate with the ink reservoir from above the heating elements, formed in a polyimide layer on a heater wafer. Each pit has a throttled portion at the rear of the heating element, ensuring that the terminal of a nozzle flow channel is situated on this throttled portion. This configuration creates a minimum sectional area in the flow channel, which helps achieve stable ink discharge characteristics. The flow channel resistance of this minimum sectional area prevents bubble pressure from being relieved toward the ink reservoir, allowing for better control of pressure propagation.

Another significant patent involves an ink jet print head that includes a head chip with multiple heating elements. This design features a flow passage forming member with several injection ports corresponding to the heating elements for jetting out ink. The substrate, which fixes the head chip, has an opening extending in the arrangement direction of the heating elements. The flow passage forming member is positioned to cover this opening, ensuring that ink supplied from the joint flows efficiently to the heating elements.

Career Highlights

Yukihisa Koizumi is currently employed at Fuji Xerox Co., Ltd., where he continues to innovate in the field of printing technology. His work has significantly impacted the efficiency and quality of ink-jet printing systems.

Collaborations

Throughout his career, Koizumi has collaborated with notable colleagues, including Masahiko Fujii and Masayoshi Tamai. These collaborations have further enhanced the development of advanced printing technologies.

Conclusion

Yukihisa Koizumi's contributions to ink-jet technology through his innovative patents have established him as a key figure in the industry. His work continues to influence the future of printing technology.