Location History:
- Odawara, JP (2001 - 2006)
- Fujisawa, JP (2006)
Company Filing History:
3 out of 42,496 
2 out of 227 
Years Active: 2001-2006
Title: The Innovations of Sunao Yonekawa
Introduction
Sunao Yonekawa is a notable inventor based in Odawara, Japan. He has made significant contributions to the field of magnetic technology, holding a total of five patents. His work primarily focuses on improving the efficiency and performance of magnetic head sliders and thin film magnetic heads.
Latest Patents
Yonekawa's latest patents include a magnetic head slider and a magnet disk apparatus. The magnetic head slider utilizes a thermal expansion type that allows for adjustable flying height. This innovation addresses critical issues such as reducing electric power consumption and minimizing heat load on the reproducing element. The design features a heating device strategically located away from the tip portions of the recording and reproducing elements. This configuration allows for deformation only in the vicinity of the heating device, enhancing the protrusion of the recording and reproducing elements without increasing the temperature of the reproducing element.
Another significant patent is the thin film magnetic head, which employs a magnetic material with a low coefficient of thermal expansion of 11.5×10/K or less. This material is used to form at least one of the lower or upper shields. The laminated film consists of a layer of this low thermal expansion magnetic material and an 80 wt % NiFe alloy layer. This innovative design results in a thin film magnetic head that exhibits reduced after-record noise and thermal protrusion.
Career Highlights
Throughout his career, Yonekawa has worked with prominent companies such as Hitachi, Ltd. and Hitachi Global Storage Technologies Japan, Ltd. His experience in these organizations has allowed him to develop and refine his inventions, contributing to advancements in magnetic technology.
Collaborations
Yonekawa has collaborated with notable coworkers, including Hiromitsu Tokisue and Nobuyuki Ishii. Their combined expertise has further propelled innovations in the field of magnetic technology.
Conclusion
Sunao Yonekawa's contributions to magnetic technology through his patents and collaborations highlight his role as a significant inventor in the industry. His work continues to influence advancements in magnetic head technology, showcasing the importance of innovation in this field.