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For the Inventor, By the Inventor

Tokyo, Japan

Hajime Nakajima

This inventor holds 58 USPTO granted patents and 3 published patent applications and 7 EPO patents, primarily in Optical Encoders (CPC class G01D). Top assignees: Mitsubishi Denki Kabushiki Kaisha, Mitsubishi Electric Corporation, Canon Kabushiki Kaisha. Active years: 1991-2026.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hajime Nakajima. Retrieved from https://idiyas.com/inventor/hajime-nakajima

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

USPTO Granted Patents = 58 

% Patents Active = 74.1

 

Average Co-Inventor Count = 3.5

ph-index = 9

Forward Citations = 292(Granted Patents)

Forward Citations (Not Self Cited) = 275(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Amagasaki, JP (1992 - 1994)
  • Hyogo, JP (1992 - 1995)
  • Ibaraki-ken, JP (2003)
  • Chiyoda-ku, JP (2016 - 2019)
  • Tokyo, JP (1991 - 2022)
  • Musashino, JP (2023 - 2024)

Company Filing History:

goldMedal22 out of 21,351 
 
Mitsubishi Denki Kabushiki Kaisha
 patents
silverMedal14 out of 16,602 
 
Mitsubishi Electric Corporation
 patents
bronzeMedal9 out of 92,994 
 
Canon Kabushiki Kaisha
 patents
4. 5 out of 5,300 
 
Nippon Telegraph and Telephone Corporation
 patents
5. 3 out of 116 
 
Shimizu Construction Co., Ltd.
 patents
6. 2 out of 194 
 
Forschungszentrum Karlsruhe Gmbh
 patents
7. 2 out of 1,698 
 
Mitsubishi Electric Research Laboratories, Inc.
 patents
8. 1 out of 1 
 
Mitsubishi Jukogyo Kabushiki Kaisha Shimizu Construction Co.
 patent
9. 1 out of 589 
 
Ntt Corporation
 patents
10. 1 out of 2 
 
Tsukishima Kikai Kabushiki Kaisha
 patents
11. 2 out of 834,513 
Other
 patents
where one patent can have more than one assignee

Years Active: 1991-2026

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Areas of Expertise:
Optical Encoder
Distance Estimation
Debugging Assistance
Magnetic Detector
Ophthalmologic Apparatus
Fundus Camera
Photoelectric Rotary Encoder
Monitoring System
Image Capture
Position Detection
Sensor Head
Welding Filler Metal
58 patents (USPTO):Explore Patents
1. 12762876 - Identification device, identification method, and identification program (2026-10-13),
2. 12007872 - Debugging assistance system and debugging assistance method (2024-06-11),
3. 11836288 - Distance estimation device, distance estimation method and distance estimation program (2023-12-05),
4. 11435822 - Estimation method, estimation program, and estimation device (2022-09-06),
5. 11385772 - Attribute-based rules for displaying additional information (2022-07-12),
6. 11314530 - User-based extension setting devices, methods, and programs (2022-04-26),
7. 10399817 - Elevator car position detection device (2019-09-03),
8. 9792688 - Position detection device (2017-10-17),
9. 9702735 - Magnetic rotation-angle detector (2017-07-11),
10. 9664535 - Rotation number detector (2017-05-30),
11. 9605981 - Absolute encoder (2017-03-28),
12. 9588236 - Radioactivity analyzing apparatus (2017-03-07),
13. 9462150 - Image read-in device with fastener to fasten transparent member retaining lens array assembly and light shield to board (2016-10-04),
14. 9410828 - Servomotor and encoder (2016-08-09),
15. 9222993 - Magnetic substance detection device (2015-12-29),

Title: Innovations and Contributions of Hajime Nakajima

Introduction

Hajime Nakajima, based in Tokyo, Japan, is a prolific inventor with an impressive portfolio of 57 patents. His work primarily focuses on advancements in debugging systems and distance estimation technologies. Through his innovative inventions, he has contributed significantly to the field of computer science and sensor technology.

Latest Patents

Hajime Nakajima's recent patents showcase his commitment to enhancing technology. One of his notable inventions is a *Debugging Assistance System and Debugging Assistance Method*. This system includes a debug information abstraction unit of a proxy server that adds functionalities to output debug information based on specific rules associated with an extension program. This information is transmitted to a debug support device to facilitate problem-solving efficiently.

Another significant invention is the *Distance Estimation Device, Distance Estimation Method, and Distance Estimation Program*. This apparatus utilizes sensor data to evaluate the relative motion of a user's head or eyeballs while searching for a target on a plane. By analyzing this movement, the system estimates the distance to the search target plane, enhancing user interaction in visual tracking applications.

Career Highlights

Hajime Nakajima's career features remarkable associations with leading companies, particularly Mitsubishi Denki Kabushiki Kaisha and Mitsubishi Electric Corporation. His roles in these organizations have allowed him to push the boundaries of innovation and develop technologies that cater to both consumer needs and industry standards.

Collaborations

During his career, Nakajima has collaborated with esteemed colleagues like Masahiro Shikai and Toru Oka. Working alongside talented individuals has enabled him to share knowledge and drive projects forward, fostering a collaborative environment that promotes groundbreaking inventions.

Conclusion

Hajime Nakajima's contributions to technology through his numerous patents are a testament to his innovative spirit and dedication to enhancing user experiences. His work in debugging systems and distance estimation devices not only showcases his expertise but also highlights the importance of collaboration in driving advancements within the tech industry. As he continues to innovate, the impact of his work will likely resonate across various fields for years to come.

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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