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For the Inventor, By the Inventor

Yokohama, Japan

Naomasa Nakamura

This inventor holds 67 USPTO granted patents and 6 published patent applications and 4 EPO patents, primarily in Optical Recording Media (CPC class 428 ). Top assignees: Kabushiki Kaisha Toshiba, Memory-Tech Corporation. Active years: 1989-2013.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Naomasa Nakamura. Retrieved from https://idiyas.com/inventor/naomasa-nakamura

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

USPTO Granted Patents = 67 

% Patents Active = 64.2

 

Average Co-Inventor Count = 5.4

ph-index = 7

Forward Citations = 185(Granted Patents)

Forward Citations (Not Self Cited) = 153(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Kanagawa, JP (1989)
  • Kanagawa-Ken, JP (2004 - 2006)
  • Yokohama, JP (1995 - 2013)

Company Filing History:

goldMedal67 out of 53,262 
 
Kabushiki Kaisha Toshiba
 patents
silverMedal2 out of 12 
 
Memory-Tech Corporation
 patents
where one patent can have more than one assignee

Years Active: 1989-2013

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Areas of Expertise:
Optical Recording Medium
Information Recording Method
Multi-Layer Optical Disc
Phase Change Medium
Data Reproduction
Storage Medium
Write-Once Medium
Signal Processing
405nm Laser
Linear Velocity
Coloring Matter Material
67 patents (USPTO):Explore Patents
1. 8593930 - Optical recording medium, information recording method, and information reproducing method (2013-11-26),
2. 8531936 - Storage medium, reproducing method, and recording method (2013-09-10),
3. 8509049 - Optical recording medium having intermediate layer of prescribed thickness and thickness range for use with 405nm laser (2013-08-13),
4. 8437242 - Optical recording medium for writing data using multiple pulses (2013-05-07),
5. 8422353 - Optical recording medium for writing data using multiple pulses (2013-04-16),
6. 8355306 - Optical recording medium, information recording method, and information reproducing method (2013-01-15),
7. 8339916 - Optical recording medium, information recording method, and information reproducing method (2012-12-25),
8. 8310913 - Optical recording medium capable of using wide ranges of linear velocity recording (2012-11-13),
9. 8264931 - Optical recording medium, information recording method, and information reproducing method (2012-09-11),
10. 8218416 - Multi-layer optical disc, information recording method and information reproducing method (2012-07-10),
11. 8184517 - Optical recording medium, information recording method, and information reproducing method (2012-05-22),
12. 8179765 - Optical recording medium, information recording method, and information reproducing method (2012-05-15),
13. 8179764 - Optical recording medium, information recording method, and information reproducing method (2012-05-15),
14. 8179763 - Optical disc, information recording method, and information reproducing method (2012-05-15),
15. 8174948 - Optical recording medium, information recording method, and information reproducing method (2012-05-08),

Title: Naomasa Nakamura: Innovator in Optical Recording Technologies

Introduction

Naomasa Nakamura, a renowned inventor based in Yokohama, Japan, has made significant contributions to the field of optical recording technologies. With an impressive portfolio of 67 patents, his work has pushed the boundaries of what is possible in information storage and retrieval.

Latest Patents

Nakamura's recent patents include innovative developments such as an optical recording medium, an information recording method, and an information reproducing method. One embodiment of his optical recording medium addresses the issue of interlayer crosstalk, allowing for stable and high-quality recording characteristics. This medium consists of a first recording part that features a first recording layer and a first light reflecting layer, positioned closer to the light receiving surface, while a second recording part contains a second recording layer and a second light reflecting layer situated farther away. Notably, the first light reflecting layer is thinner than the second.

Additionally, he developed a storage medium that incorporates a transparent resin substrate with concentric or spiral grooves, onto which a recording film is placed. This design allows for a reproduction durability count of 1,000,000 or more when continuously read by a laser beam, showcasing exceptional performance.

Career Highlights

Throughout his career, Nakamura has worked with notable companies such as Kabushiki Kaisha Toshiba and Memory-Tech Corporation. His dedication to research and development has established him as a leading figure in his field.

Collaborations

Nakamura's innovative journey has been enriched by collaborations with talented professionals like Naoki Morishita and Koji Takazawa. Working together, they have advanced the state of optical media technologies and contributed to the success of various projects.

Conclusion

In summary, Naomasa Nakamura's impactful inventions and patents have considerably influenced optical recording technologies. His commitment to innovation continues to inspire future developments in the field, ensuring that high-quality information storage remains at the forefront of technological advancement.

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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