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For the Inventor, By the Inventor

Ome, Japan

Masafumi Iwashiro

USPTO Granted Patents = 19 

Average Co-Inventor Count = 1.3

ph-index = 5

Forward Citations = 50(Granted Patents)


Location History:

  • Ome, JP (2004 - 2008)
  • Tokyo, JP (1998 - 2014)
  • Kanagawa, JP (2014 - 2024)
  • Yokohama Kanagawa, JP (2019 - 2024)

Company Filing History:

goldMedal19 out of 52,711 
 
Kabushiki Kaisha Toshiba
 patents
silverMedal5 out of 1,502 
 
Toshiba Electronic Devices & Storage Corporation
 patents
where one patent can have more than one assignee

Years Active: 1998-2025

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19 patents (USPTO):Explore Patents
1. 12462837 - Magnetic disk device and method (2025-11-04),
2. 11996127 - Method for manufacturing disk device and computer program product (2024-05-28),
3. 11875821 - Disk device (2024-01-16),
4. 10553248 - Magnetic disk device and head position control method (2020-02-04),
5. 10372375 - Magnetic disk device and command reordering method thereof (2019-08-06),
6. 10217485 - Magnetic disc device and position control method (2019-02-26),
7. 8817416 - Magnetic disk device and method of controlling magnetic heads (2014-08-26),
8. 8773808 - Magnetic disk device and head-position control method (2014-07-08),
9. 8315008 - Magnetic disk device and head position control method (2012-11-20),
10. 7423835 - Method and apparatus for servo control using spiral servo information in a disk drive (2008-09-09),
11. 7221533 - Method and apparatus for servo information writing in a disk drive (2007-05-22),
12. 7173789 - Head position calculation method in magnetic disc apparatus (2007-02-06),
13. 7158334 - Method and apparatus for head positioning control with disturbance compensation in a disk drive (2007-01-02),
14. 7061710 - Method and apparatus for positioning a head in a disk drive with servo writing function (2006-06-13),
15. 6940680 - Method and apparatus for head positioning control in disk drive (2005-09-06),

Title: Masafumi Iwashiro: Innovator in Magnetic Disk Technology

Introduction

Masafumi Iwashiro is a prominent inventor based in Ome, Japan, known for his significant contributions to magnetic disk technology. With a total of 19 patents to his name, Iwashiro has made remarkable advancements in the field, particularly in the design and manufacturing of disk devices.

Latest Patents

Iwashiro's latest patents include a magnetic disk device and method, which involves a controller that corrects an instruction value of a voice coil motor (VCM) current through a first feedforward control based on a detection value from a sensor. This innovative method allows for the acquisition of a waveform that represents the deviation of a magnetic head's position from its target, enabling adjustments to improve accuracy. Another notable patent is a method for manufacturing disk devices and a computer program product, which specifies a frequency to be corrected by an additional filter based on head position error spectra, ensuring optimal performance in disk devices.

Career Highlights

Throughout his career, Masafumi Iwashiro has worked with notable companies such as Toshiba Corporation and Toshiba Electronic Devices & Storage Corporation. His work has significantly impacted the development of storage technologies, enhancing the efficiency and reliability of magnetic disk devices.

Collaborations

Iwashiro has collaborated with esteemed colleagues, including Masahide Yatsu and Hideo Sado, contributing to various projects that have advanced the field of magnetic storage technology.

Conclusion

Masafumi Iwashiro's innovative work in magnetic disk technology has established him as a key figure in the industry. His patents and collaborations reflect his commitment to advancing technology and improving the performance of disk devices.

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