Takashi Yorifuji

Title: **Innovations of Takashi Yorifuji: A Pioneer in Fluorescent Lighting**

Introduction

Takashi Yorifuji, an inventor hailing from Kanagawa-ken, Japan, has made significant contributions to the field of lighting technology. With a portfolio of six patents, his innovations reflect a deep understanding of both functionality and efficiency in fluorescent lamps.

Latest Patents

Among his latest inventions, Yorifuji developed a unique fluorescent lamp that features bent portions and an innovative manufacturing method. This fluorescent lamp includes a bulb that combines bent and straight-tube sections with an external tube diameter ranging from 12 to 20 mm and a tube length of 800 to 2500 mm. The straight portions are designed to lie generally within the same plane as the bent sections, allowing for a compact construction.

The design consists of a pair of end sections with electrodes sealed inside, establishing a continuous discharge path through both the straight and bent parts. To enhance performance, a phosphor layer is applied to the inner surface of the bulb, while a discharge medium containing mercury is sealed within. This configuration significantly reduces thermal deterioration of the phosphor layer in the straight tube sections, thus maintaining the initial light flux and enabling high-efficiency lighting. This innovative fluorescent lamp not only improves light output properties but is also compatible with advanced light fixtures.

Additionally, Yorifuji holds another patent related to a glow discharge lamp. This device is characterized by a discharge vessel that houses a pair of electrodes, along with an ionizable filling made principally of rare gas and an emissive material containing zinc alloy deposited on at least one of the electrodes.

Career Highlights

Yorifuji's career includes key roles at notable companies such as Toshiba Lighting & Technology Corporation and Kabushiki Kaisha Toshiba. His work in these organizations has facilitated the transition of innovative concepts into practical market solutions.

Collaborations

Throughout his journey, Yorifuji has collaborated with talented individuals, including Ichiro Yamada and Kenji Sugiyama. These partnerships have been instrumental in refining his inventions and expanding their impact on the lighting industry.

Conclusion

With his unique approach to designing efficient and compact lighting solutions, Takashi Yorifuji stands out as a significant figure in the world of innovations. His contributions pave the way for future advancements in fluorescent lamp technology, combining efficiency with improved performance metrics.