Location History:
- Shiroyama, JP (2002 - 2006)
- Kanagawa, JP (2008)
Company Filing History:
2 out of 42,517 
1 out of 3,781 
2 out of 832,912 Years Active: 2002-2008
Title: Hiroji Yamada – A Pioneer in Micro Sensor Devices
Introduction
Hiroji Yamada, an inventor based in Shiroyama, Japan, has made significant strides in the field of micro sensor technology and semiconductor devices. With a total of four patents to his name, Yamada has demonstrated his innovative approach and commitment to advancing technology in various industries.
Latest Patents
Yamada's latest contributions include an ultra-mini and low-cost refractive index measuring device. This innovative micro sensor device is applicable to biochemical measurements of extremely minute samples, using a photonic crystal while eliminating the need for an external spectrograph. The device comprises a light source emitting light with a single wavelength, and a microcavity that changes resonant wavelengths based on its position. With this design, it measures the refractive index of materials by detecting positional changes in light transmission, thereby streamlining the measurement process in smaller and more efficient terms.
Another notable invention is a semiconductor device characterized by high structural reliability and low parasitic capacitance. This device integrates a semiconductor region with laminated emitter, base, and collector regions, along with an insulating protection layer and wiring layer. The design features a via hole which allows direct contact to the emitter region's electrode, contributing to improved performance and functionality.
Career Highlights
Throughout his career, Hiroji Yamada has held positions at reputable companies such as Hitachi, Ltd. His experience in these esteemed organizations has undoubtedly influenced his innovative thinking and led to the successful development of his patented technologies.
Collaborations
Yamada has also had the opportunity to collaborate with talented coworkers, including Kiichi Yamashita and Kenji Sekine. These partnerships have fostered creativity and shared ideas, which have been essential in driving his innovative projects forward.
Conclusion
Hiroji Yamada's dedication to innovation within the realms of micro sensors and semiconductor devices exemplifies his significant contribution to technology. Through four patents and impactful collaborations, he continues to advance the field, making a lasting impression in the world of inventions. As technology evolves, his work remains crucial in influencing the future of biochemical measurements and semiconductor reliability.