Tomokazu Kakumoto

Title: Innovator Spotlight: Tomokazu Kakumoto

Introduction

Tomokazu Kakumoto, an accomplished inventor based in Nagaokakyo, Japan, has made significant contributions to the field of image sensing technology. With an impressive portfolio of 18 patents, he has become a prominent figure in innovation, particularly in the development of solid-state image-sensing devices.

Latest Patents

Kakumoto's latest patents include groundbreaking inventions such as a solid-state image-sensing device that features a plurality of controlled pixels. Each pixel operates with a ternary-voltage transfer gate signal switched among three voltage levels. This innovative method allows for effective voltage feeding to a transfer gate, enabling a MOS transistor to function in a threshold region. The photography results from potential conversion—whether linear or logarithmic—by a buried photodiode are transferred to an N-type floating diffusion layer to produce high-quality image signals.

Additionally, he developed an image-sensing apparatus that dynamically adjusts its operation based on subject brightness. If the detected brightness exceeds a predetermined threshold, the apparatus performs logarithmic conversion; otherwise, it opts for linear conversion. This adaptability enhances the device's performance in varying lighting conditions, marking a significant advancement in optical technology.

Career Highlights

Kakumoto has had an illustrious career working with prestigious companies such as Minolta Company, Ltd. and Konica Minolta Holdings, Inc. His work in these organizations has positioned him at the forefront of the imaging and optical innovations sector. His contributions have not only advanced technology but have also set new benchmarks in image-sensing devices.

Collaborations

Throughout his career, Kakumoto has collaborated with esteemed colleagues, including Yoshio Hagihara and Masayuki Kusuda. These partnerships have fostered a collaborative spirit that has led to groundbreaking inventions and innovative solutions in the field of image sensing.

Conclusion

Tomokazu Kakumoto is a testament to the impact of dedicated research and development in the realm of technology. With his extensive patent portfolio and influential collaborations, he continues to shape the landscape of image-sensing technology, inspiring future innovations and pioneering new avenues for invention.