Akihiko Tsurumaru is a notable inventor based in Iwaki, Japan. He has made significant contributions to the field of lighting technology, particularly in the development of metal halide and fluorescent lamps. With a total of 4 patents to his name, Tsurumaru's work has had a lasting impact on the industry.

Latest Patents

Tsurumaru's latest patents include innovative designs for metal halide lamps with tungsten coils that feature varying pitches. One of his key inventions is a method for manufacturing a metal halide lamp where tungsten coils are designed to have diameters wider than the outer diameters of the electrodes. This design ensures that the coils have a pitch sufficient to prevent molten quartz glass from entering between them. After fixing the tungsten coils around the electrodes, the pitch on the sides nearest the molybdenum foils is extended, which helps to tightly secure the coils around the electrodes. This design prevents cracks in the quartz glass bulb due to thermal expansion and ensures that the quartz glass bulb contacts the electrodes, preventing peeling-off and accumulation of sealed material.

Another significant patent involves a preform for a fluorescent lamp, which includes a bulb and a stem equipped with a filament and a discharge electrode. This preform allows for the creation of a fluorescent lamp without an exhaust pipe, making it suitable for use as an indicating lamp. The lamp is sealed after exhausting the inside air and charging it with inert gas and mercury. This design allows for quick evaporation of liquefied mercury, stabilizing the lamp's characteristics shortly after it is turned on.

Career Highlights

Tsurumaru is currently employed at Stanley Electric Co., Ltd., where he continues to innovate in the field of lighting technology. His work has not only advanced the efficiency and reliability of lamps but has also contributed to the overall safety and performance of lighting solutions.

Collaborations

Throughout his career, Tsurumaru has collaborated with esteemed colleagues such as Masanobu Aizawa and Tsuneyoshi Sibasaki. These collaborations have further enriched his contributions to the field and have fostered a spirit of innovation within his team.

Conclusion

Akihiko Tsurumaru's inventive spirit and dedication to advancing lighting technology have made

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