Tokyo, Japan

Akifumi Kamijima

This inventor holds 89 USPTO granted patents and 1 published patent application and 1 EPO patent, primarily in MEMS Technology (CPC class G11B5-127). Top assignees: Tdk Corporation, Co Tdk Corporation. Active years: 1998-2023.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Akifumi Kamijima. Retrieved from https://idiyas.com/inventor/akifumi-kamijima

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

USPTO Granted Patents = 89 

% Patents Active = 70.8


Average Co-Inventor Count = 1.3

ph-index = 10

Forward Citations = 374(Granted Patents)

Forward Citations (Not Self Cited) = 330(Dec 10, 2025)


Inventors with similar research interests:

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Location History:

  • Nihonbashi, JP (2003)
  • Chou-ku, JP (2006)
  • Chuo-ku, JP (2002 - 2008)
  • Tokyo, JP (1998 - 2023)

Company Filing History:


Years Active: 1998-2023

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Areas of Expertise:
MEMS Microphone
Thin-Film Capacitor
Magnetic Recording
MEMS Switch
Magnetoresistive Element
Photoresist Pattern
Microdevice Manufacturing
Magnetic Memory Device
Coil Component
Heat-Assisted Recording
Plating Method
Substrate Processing
89 patents (USPTO):Explore Patents

Title: Innovations of Akifumi Kamijima: A Pioneer in MEMS Technology

Introduction: Akifumi Kamijima, based in Tokyo, Japan, is a notable inventor recognized for his significant contributions to micro-electromechanical systems (MEMS) technology. With an impressive total of 89 patents to his name, Kamijima continues to push the boundaries of innovation in his field.

Latest Patents: Among his recent inventions is the "Magnetically Actuated MEMS Switch." This innovative switch utilizes a combination of magnetic core portions, signal lines, and coils to create an efficient mechanism that switches connections based on magnetic fields. The first contact point is influenced by the presence or absence of applied magnetic fields, allowing for effective connection and disconnection. Another significant patent is the "Method of Processing Inorganic Material Substrate." This method outlines a unique approach to processing substrates, where altered portions are selectively exposed during etching to achieve desired shapes. This advancement promotes precision in the manufacturing of devices, showcasing Kamijima's expertise in material processing.

Career Highlights: Akifumi Kamijima has worked with notable companies, including TDK Corporation. His work at TDK has been instrumental in developing cutting-edge technologies that have impacted various applications in electronics and communications. His dedication to research and development has led to the successful realization of numerous patented inventions.

Collaborations: Throughout his career, Kamijima has collaborated with renowned professionals in the field, including Hitoshi Hatate and Hideyuki Yatsu. These collaborations have fostered a dynamic exchange of ideas, resulting in further advancements in MEMS technology and substrate processing techniques.

Conclusion: Akifumi Kamijima’s contributions to the field of MEMS technology through his remarkable patents demonstrate his role as a driving force in innovation. His groundbreaking work in developing sophisticated devices and methods reflects a commitment to enhancing technology. As he continues to innovate, Kamijima's impact on the industry is sure to grow, inspiring future generations of inventors.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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