Location History:
- Gunma, JP (1996)
- Tokyo, JP (1998)
- Gumma, JP (1998)
- Tochigi-ken, JP (1998)
- Tano-gun, JP (1999)
- Takasaki, JP (2008)
- Gunma-ken, JP (1996 - 2009)
- Kumagaya, JP (2011)
- Kumagagaya, JP (2012)
Company Filing History:
10 out of 2,333 
2 out of 87 Years Active: 1996-2012
Title: Chiharu Mitsumata: Innovator in Magnetic Sensor Technology
Introduction
Chiharu Mitsumata is a prominent inventor based in Kumagaya, Japan. She has made significant contributions to the field of magnetic sensor technology, holding a total of 11 patents. Her innovative work has paved the way for advancements in rotation-angle detection and magnetic sensing.
Latest Patents
Mitsumata's latest patents include a rotation-angle-detecting apparatus. This apparatus comprises a magnet rotor, a magnetic sensor that detects the direction of magnetic flux from the rotor, a correction circuit, and an angle-calculating circuit. The magnetic sensor features bridge circuits X and Y, each consisting of four connected magnetoresistive devices. These devices include a spin-valve and a giant-magnetoresistive film. The correction circuit calculates the difference and sum of the output voltages from the bridge circuits, ensuring their amplitudes are equal. The angle-calculating circuit then determines the rotation angle of the rotor through arctangent calculations.
Another notable patent is a magnetic sensor with a bridge circuit that connects four magnetoresistive devices. This sensor includes a pinned layer with unidirectional magnetic anisotropy and a free layer whose magnetization direction aligns with an external magnetic field. The design ensures that at least one of the magnetoresistive devices meets specific angular conditions, enhancing its performance.
Career Highlights
Throughout her career, Mitsumata has worked with reputable companies such as Hitachi Metals, Ltd. and Applied Magnetics, LLC. Her experience in these organizations has contributed to her expertise in magnetic sensor technology and innovation.
Collaborations
Mitsumata has collaborated with notable colleagues, including Toshio Kobayashi and Yasuyuki Okada. These partnerships have fostered a collaborative environment that encourages innovation and the sharing of ideas.
Conclusion
Chiharu Mitsumata's contributions to magnetic sensor technology are significant and impactful. Her innovative patents and collaborations highlight her role as a leading inventor in her field. Her work continues to influence advancements in technology and inspire future innovations.