Company Filing History:
Years Active: 1990
Title: Harumi Yuyama: Innovator in Noncontacting IC Card Technology
Introduction
Harumi Yuyama is a notable inventor based in Yamanashi, Japan. She has made significant contributions to the field of integrated circuit technology, particularly in the development of noncontacting IC cards. Her innovative approach has led to advancements that enhance the functionality and efficiency of these devices.
Latest Patents
Yuyama holds a patent for a noncontacting IC card that is supplied with power from an outside source. This IC card, which can be utilized as a cash card, features a RAM, a control circuit for managing access to the RAM, and a power supply circuit that receives energy externally. The design includes a first voltage detector that generates a starting output when the supply voltage exceeds a predetermined first reference voltage. Additionally, a second voltage detector produces a control signal when the supply voltage surpasses a higher predetermined second reference voltage. An AND gate is incorporated to generate a RAM control signal, enabling the RAM to operate when both the starting signal and control signal are present.
Career Highlights
Yuyama is currently employed at Citizen Watch Company, Ltd., where she continues to innovate and develop new technologies. Her work has been instrumental in advancing the capabilities of IC cards, making them more efficient and user-friendly.
Collaborations
Throughout her career, Yuyama has collaborated with esteemed colleagues, including Yoshiaki Kato and Tutomu Ojima. These partnerships have fostered a creative environment that encourages the exchange of ideas and the development of groundbreaking technologies.
Conclusion
Harumi Yuyama's contributions to the field of noncontacting IC card technology exemplify her innovative spirit and dedication to advancing electronic devices. Her patent and ongoing work at Citizen Watch Company, Ltd. highlight her role as a leading inventor in this specialized area.