This inventor holds 2 USPTO granted patents. Top assignees: Hitachi Global Storage Technologies, International Business Machines Corporation. Active years: 2001-2003.
Location History:
- Kanagawa-ken, JP (2001)
- Fujisawa, JP (2003)
Company Filing History:
1 out of 52 
1 out of 166,209 
Years Active: 2001-2003
Title: Sunao Nemoto: Innovator in Spindle Motor Technology
Introduction
Sunao Nemoto is a notable inventor based in Fujisawa, Japan. He has made significant contributions to the field of spindle motor technology, holding 2 patents that showcase his innovative approach to engineering challenges.
Latest Patents
One of his latest patents is for a spindle motor that features improved bonding between its bearing cartridge and hub. This motor is designed to reduce deformation caused by temperature changes. It is an outer ring type motor that integrates the shaft, ball bearings, and sleeve. The outer periphery of the sleeve is attached to the inner periphery of the hub at a bonding region positioned axially between the ball bearing holding portions. This bonding portion includes a stress-reducing region, and the diameter of the hub within this region is not uniform, which helps to minimize stress generated due to thermal expansion.
Another significant patent by Nemoto is related to a disk drive apparatus, which includes an attachment structure and method aimed at equalizing the coupling resonance frequency of a hard disk drive, regardless of whether one or multiple disks are loaded. This innovation is based on parameters obtained from a simulation model. The modeling of coupling vibration for one disk and for two disks is performed using a coupling vibration model of a linear two-degree-of-freedom system. The component parts of the spindle motor are adjusted to ensure that the resonance frequency remains consistent, enabling stable track following without the need for additional dummy disks or parts.
Career Highlights
Throughout his career, Sunao Nemoto has worked with prominent companies such as Hitachi Global Storage Technologies and IBM. His experience in these organizations has allowed him to refine his skills and contribute to groundbreaking advancements in technology.
Collaborations
Some of his notable coworkers include David W. Albrecht and Kiyoshi Satoh. Their collaboration has likely fostered an environment of innovation and creativity, leading to the development of advanced technologies in the field.
Conclusion
Sunao Nemoto's contributions to spindle motor technology reflect his dedication to innovation and engineering excellence. His patents demonstrate a deep understanding of the complexities involved in motor design and functionality.