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For the Inventor, By the Inventor

Iijima, Japan

Haruo Kitahara

This inventor holds 4 USPTO granted patents. Top assignee: Shinano Tokki Corporation. Active years: 1980-1990.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Haruo Kitahara. Retrieved from https://idiyas.com/inventor/haruo-kitahara

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

USPTO Granted Patents = 4

% Patents Active = 100.0

Average Co-Inventor Count = 1.3

ph-index = 4

Forward Citations = 74(Granted Patents)


Location History:

  • Ijima, JP (1980)
  • Iijima, JP (1988 - 1989)
  • Nagano, JP (1990)

Company Filing History:

goldMedal4 out of 7 
 
Shinano Tokki Corporation
 patents

Years Active: 1980-1990

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4 patents (USPTO):Explore Patents
1. 4900958 - Drive motor for magnetic disks, optical disks, and magneto-optical disks (1990-02-13),
2. 4839546 - Rotational noise reduction structure in dc motor with rotor magnets (1989-06-13),
3. 4760298 - Magnetic disk motor having a cup-shaped rotor (1988-07-26),
4. 4227164 - Electromagnetic rotating apparatus (1980-10-07),

Title: Haruo Kitahara: Innovator in Drive Motor Technology

Introduction

Haruo Kitahara is a notable inventor based in Iijima, Japan. He has made significant contributions to the field of drive motor technology, particularly in the design and functionality of motors for magnetic disks, optical disks, and magneto-optical disks. With a total of 4 patents to his name, Kitahara's work has had a lasting impact on the industry.

Latest Patents

One of Kitahara's latest patents is a drive motor designed for rotating magnetic disks, optical disks, and magneto-optical disks. This innovative motor features an armature that is concentrically secured to a center shaft, which is affixed to the base frame of a disk drive unit. The rotor frame is rotatably supported in a cantilever fashion on the free end of the center shaft by a pair of bearings. The cup-shaped rotor frame encircles the armature and includes a disk support that projects outwardly. A permanent magnet secured inside the sidewall interacts with the magnetic fields produced by the armature, enhancing the motor's efficiency.

Another significant patent addresses the reduction of rotational noise in DC motors with rotor magnets. This invention involves aligning the magnetic center plane of the rotor magnet with the geometric center plane of the stator core. This alignment allows for an asymmetric distribution of the air gap magnetic flux density, effectively reducing the rotational noise without compromising the axial dimensions of the magnet.

Career Highlights

Kitahara is currently employed at Shinano Tokki Corporation, where he continues to innovate and develop advanced motor technologies. His work has been instrumental in improving the performance and reliability of disk drive systems.

Collaborations

Throughout his career, Kitahara has collaborated with various professionals in the field, including his coworker Takeshi Ohshita. These collaborations have fostered an environment of innovation and creativity, leading to the development of cutting-edge technologies.

Conclusion

Haruo Kitahara's contributions to drive motor technology exemplify the spirit of innovation. His patents not only enhance the functionality of disk drives but also pave the way for future advancements in the field.

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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