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.

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