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For the Inventor, By the Inventor

Kawasaki, Japan

Hiroshi Kumita

This inventor holds 5 USPTO granted patents. Top assignee: Fujitsu Corporation. Active years: 1999-2002.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Hiroshi Kumita. Retrieved from https://idiyas.com/inventor/hiroshi-kumita

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

USPTO Granted Patents = 5

% Patents Active = 100.0

Average Co-Inventor Count = 1.4

ph-index = 3

Forward Citations = 41(Granted Patents)


Location History:

  • Kawasaki, JP (1999 - 2000)
  • Higashichikuma-gun, JP (2002)
  • Nagano, JP (2002)

Company Filing History:

goldMedal5 out of 39,374 
 
Fujitsu Corporation
 patents

Years Active: 1999-2002

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5 patents (USPTO):Explore Patents
1. 6459220 - Spindle-motor control method, spindle-motor control device, spindle-motor drive circuit and disk device (2002-10-01),
2. 6356515 - High power controlling system for magneto-optical storage system (2002-03-12),
3. 6118743 - Information storage apparatus rapidly returning from a sleep mode to a (2000-09-12),
4. 5930221 - Optical storage device made thinner by substituting electrical means for (1999-07-27),
5. 5894204 - Spindle motor control method and disk unit (1999-04-13),

Title: Innovations of Hiroshi Kumita

Introduction

Hiroshi Kumita is a notable inventor based in Kawasaki, Japan. He has made significant contributions to the field of spindle motor control and optical storage systems. With a total of 5 patents, his work has advanced the technology used in various electronic devices.

Latest Patents

Kumita's latest patents include a spindle-motor control method, spindle-motor control device, spindle-motor drive circuit, and disk device. These inventions focus on controlling the rpm of a spindle motor to reduce its rise time. The control circuit detects when the spindle motor approaches a target rpm and discharges the charge pump to minimize rotation errors. This innovation effectively suppresses overshoot, leading to improved performance.

Another significant patent is the high power controlling system for magneto-optical storage systems. This invention involves a method for processing optical storage media by conducting high power adjustments during information recording. By accurately controlling the laser power, it enables highly reliable high-density recording, regardless of the frequency of write and erase operations.

Career Highlights

Kumita is currently employed at Fujitsu Corporation, where he continues to develop innovative technologies. His work has been instrumental in enhancing the efficiency and reliability of electronic devices.

Collaborations

Some of his notable coworkers include Shigenori Yanagi and Yoshiyuki Nanba. Their collaborative efforts have contributed to the advancement of technology in their respective fields.

Conclusion

Hiroshi Kumita's contributions to spindle motor control and optical storage systems highlight his innovative spirit and technical expertise. His patents reflect a commitment to improving technology and enhancing device performance.

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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