Takao Tohda

Title: Takao Tohda: Innovator in Electron-Emitting Devices and Recording Technologies

Introduction

Takao Tohda is a prominent inventor based in Ikoma, Japan, known for his significant contributions to the fields of electron-emitting devices and information recording technologies. With a total of 23 patents to his name, Tohda has made remarkable advancements that have influenced various technological sectors.

Latest Patents

Tohda's latest patents include groundbreaking inventions in electron-emitting devices. One notable invention describes an electron-emitting device where the electron supplying layer consists of an n-GaN layer, and the electron transferring layer is composed of non-doped AlGaN with a graded composition for aluminum concentration. The surface layer features non-doped AlN with negative electron affinity (NEA). By applying a specific voltage, which renders the surface electrode side positive, the band of AlGaN bends, facilitating a current primarily from the electron supplying layer to the surface layer through the electron transferring layer. This configuration produces excellent electron-emitting characteristics.

Another of Tohda’s notable patents involves high-density recording through a conductive probe in contact with phase change materials. This invention describes an information recording and reproducing device that uses an inorganic recording medium comprising phase change, shape-changing, and magnetic materials. The device enables information to be recorded by heating the recording medium through a conductive probe that can contact or be proximate to the recording surface, effectively changing its physical state.

Career Highlights

Throughout his career, Tohda has worked at notable institutions, including Matsushita Electric Industrial Co., Ltd. (now known as Panasonic) and the Agency of Industrial Science and Technology. His work at these esteemed organizations has significantly contributed to his development as an influential inventor in his field.

Collaborations

Takao Tohda has collaborated with other talented researchers and inventors, including Hiroyuki Kado and Tomizo Matsuoka. These partnerships have enhanced the scope and depth of his innovations, leading to advancements that have been recognized within the industry.

Conclusion

Takao Tohda's work in electron-emitting devices and high-density recording technologies exemplifies the spirit of innovation that drives progress in our technical world. With 23 patents to his credit, his contributions continue to play a vital role in shaping future technologies, ensuring that his legacy as an inventor remains firmly established.