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For the Inventor, By the Inventor

Hirakata, Japan

Yoshihiro Ashizaki

This inventor holds 7 USPTO granted patents. Top assignee: Matsushita Electric Industrial Co., Ltd.. Active years: 1989-2008.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Yoshihiro Ashizaki. Retrieved from https://idiyas.com/inventor/yoshihiro-ashizaki

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

USPTO Granted Patents = 7

% Patents Active = 85.7

Average Co-Inventor Count = 2.0

ph-index = 4

Forward Citations = 57(Granted Patents)


Location History:

  • Katano, JP (1989 - 1990)
  • Hirakata, JP (1989 - 2008)

Company Filing History:

goldMedal7 out of 27,375 
 
Matsushita Electric Industrial Co., Ltd.
 patents

Years Active: 1989-2008

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7 patents (USPTO):Explore Patents
1. 7420309 - Spindle motor (2008-09-02),
2. 7321178 - Spindle motor (2008-01-22),
3. 7284908 - Hydrodynamic bearing device and motor (2007-10-23),
4. 4970423 - Stepper motor with a rotor teeth sensor (1990-11-13),
5. 4868485 - Three-phase current output circuit with temperature compensating function (1989-09-19),
6. 4831344 - IC output circuit for use in pulse width modulator (1989-05-16),
7. 4818908 - Brushless motor having phase advance (1989-04-04),

Title: Innovations of Yoshihiro Ashizaki

Introduction

Yoshihiro Ashizaki is a notable inventor based in Hirakata, Japan. He has made significant contributions to the field of spindle motors, holding a total of 7 patents. His work has been instrumental in advancing motor technology, particularly in enhancing the efficiency and performance of spindle motors.

Latest Patents

One of his latest patents focuses on a spindle motor design where the teeth portions of a stator core, formed by laminating magnetic plates, are bent to increase the number of turns of the stator windings. This innovative design avoids gaps in the teeth portions between the magnetic plates, allowing for precise attractive force adjustments. The stator core is configured so that its teeth portions face the surface of a rotor magnet at right angles, ensuring that the teeth portions and salient pole arm portions, around which windings are wound, remain substantially parallel to each other. Additionally, the salient pole arm portions are positioned approximately halfway between the lower surface of a hub and the upper surface of a base. The thickness of the magnetic plate is carefully set to be 0.5 to 0.9 times that of other portions, further enhancing the motor's performance.

Career Highlights

Yoshihiro Ashizaki has been associated with Matsushita Electric Industrial Co., Ltd., where he has contributed to various innovative projects. His expertise in spindle motor technology has positioned him as a key figure in the development of advanced motor systems.

Collaborations

Throughout his career, Ashizaki has collaborated with talented coworkers, including Hiroaki Tamae and Akihiko Wakitani. These collaborations have fostered a creative environment that has led to numerous advancements in motor technology.

Conclusion

Yoshihiro Ashizaki's contributions to spindle motor technology exemplify his innovative spirit and dedication to engineering excellence. His patents reflect a deep understanding of motor design, which continues to influence the industry today.

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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