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For the Inventor, By the Inventor

Kawasaki, Japan

Hiroyuki Rokugawa

This inventor holds 17 USPTO granted patents. Top assignees: Fujitsu Corporation, Fuijtsu Limited. Active years: 1992-2007.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hiroyuki Rokugawa. Retrieved from https://idiyas.com/inventor/hiroyuki-rokugawa

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

USPTO Granted Patents = 17

% Patents Active = 88.2

Average Co-Inventor Count = 1.9

ph-index = 7

Forward Citations = 130(Granted Patents)


Location History:

  • Sagamihara, JP (2006)
  • Kawasaki, JP (1992 - 2007)

Company Filing History:

goldMedal16 out of 39,374 
 
Fujitsu Corporation
 patents
silverMedal1 out of 2 
 
Fuijtsu Limited
 patents

Years Active: 1992-2007

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17 patents (USPTO):Explore Patents
1. 7266308 - Light output control circuit (2007-09-04),
2. 7119617 - Differential amplifier (2006-10-10),
3. 7068747 - Data decision circuit using clock signal which has phase optimized with respect to phase of input data signal (2006-06-27),
4. 6975813 - Light output control device (2005-12-13),
5. 6256329 - Semiconductor laser driver circuit (2001-07-03),
6. 6242870 - Light emitting device driving circuit (2001-06-05),
7. 6078150 - Light-emitting element driving circuit and device using the same (2000-06-20),
8. 5923455 - Data identifying device and light receiver using the same (1999-07-13),
9. 5848084 - Semiconductor light source for an optical transmitter and an optical (1998-12-08),
10. 5796792 - Data identifying device and light receiver using the same (1998-08-18),
11. 5740210 - Data discriminating circuit and a parallel data receiver using the same (1998-04-14),
12. 5715075 - Optical processing device operating in a wavelength-synchronized mode (1998-02-03),
13. 5657144 - Optical processing device operating in a wavelength-synchronized mode (1997-08-12),
14. 5473636 - Data discriminating circuit and an optical receiver using the same (1995-12-05),
15. 5337323 - Integrated semiconductor laser array apparatus (1994-08-09),

Title: The Innovative Mind of Hiroyuki Rokugawa

Introduction

Hiroyuki Rokugawa is a notable inventor based in Kawasaki, Japan. With a remarkable portfolio of 17 patents, his innovative contributions have significantly advanced the field of electronic engineering. Rokugawa's latest patents showcase his expertise in light output control and ultra-high-speed signal transmission, proving his position as a leading figure in inventiveness.

Latest Patents

Rokugawa's recent patents highlight his technical prowess. One of his latest innovations is a **Light Output Control Circuit**. This invention utilizes a switching signal from a coarse/fine switching and operation mode switching circuit to enhance the width of change of a counter control value during power-up. Once a steady state is achieved, the width of change is reduced, ensuring a stable operation with limited frequency updating controlled by an update permit circuit. Additionally, in a steady state, the frequency band of a current source in a laser diode (LD) driving circuit is also narrowed, optimizing performance.

Another significant patent is for a **Differential Amplifier**. This invention is specifically designed for ultra-high-speed signal transmitting apparatuses. It incorporates a first inductor positioned between a differential transistor and a gate-grounded transistor, along with an optional second inductor placed between a load resistor and a power supply. An optional third inductor is also integrated between a source follower transistor and an output terminal, showcasing Rokugawa’s attention to detail and innovation.

Career Highlights

Throughout his career, Hiroyuki Rokugawa has worked with esteemed companies including **Fujitsu Corporation** and **Fujitsu Limited**. His tenure at these organizations enabled him to collaborate on groundbreaking technologies and deepen his expertise in electronic systems and circuit design.

Collaborations

Rokugawa has collaborated with notable colleagues such as **Nobuhiro Fujimoto** and **Tadashi Ikeuchi**, contributing to a vibrant exchange of ideas and innovative solutions within their projects. These collaborations have greatly influenced the advancements seen in their respective fields.

Conclusion

In conclusion, Hiroyuki Rokugawa stands out as a pivotal inventor whose work continues to impact electronic engineering. His 17 patents, including cutting-edge light output control mechanisms and differential amplifiers, demonstrate his commitment to innovation. As companies and researchers continue to build upon his inventions, Rokugawa's legacy in the world of technology will undoubtedly endure.

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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