Yoshihisa Umezawa

Title: Innovations of Yoshihisa Umezawa

Introduction

Yoshihisa Umezawa is a notable inventor based in Konosu, Japan. He has made significant contributions to the field of lighting technology, holding three patents that showcase his innovative spirit and technical expertise.

Latest Patents

Umezawa's latest patents include a discharge-lamp lighting device and a general lighting device. The discharge-lamp lighting device features a direct-current power generation circuit, a rectangular-wave generation circuit, a pulse generating circuit, lamp-voltage detection means, and pulse-generation command means. This device generates direct-current power from external sources and converts it into rectangular-wave alternating-current power. The pulse generating circuit superposes high-voltage pulses on the rectangular-wave power to initiate a discharge lamp. The lamp-voltage detection means provides digital feedback on the lamp voltage, while the pulse-generation command means activates the pulse generating circuit based on predetermined voltage levels.

The general lighting device incorporates a power-factor correction circuit, a step-down chopper circuit, a full-bridge circuit, and control integrated circuits (ICs). It supplies driving voltage to the control ICs, which manage the on/off operation of the switching elements. Additionally, the device includes a detector that monitors the driving voltage and judgment equipment that instructs the control ICs to output driving voltages in a specific order when certain voltage thresholds are met.

Career Highlights

Throughout his career, Umezawa has worked with reputable companies such as Eye Lighting Systems Corporation and Nippon Antenna Co., Ltd. His experience in these organizations has allowed him to refine his skills and contribute to advancements in lighting technology.

Collaborations

Umezawa has collaborated with talented individuals, including Kensuke Kaneko and Ichirou Terayama. These partnerships have fostered innovation and creativity in his projects.

Conclusion

Yoshihisa Umezawa's contributions to lighting technology through his patents and collaborations highlight his role as a significant inventor in the field. His work continues to influence advancements in lighting solutions.