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Optical Fiber Natural Daylighting System

Learning from the functions of all life

About Us


Nippon Bital Co., Ltd.   (J Bital)


4-10-13 Higashiryoke Kawaguchi, Saitama, Japan 332-0003


Natural sunlight tracking, transmission, and illumination systems

Learning from the functions of all life and creating products

Tel   +81-48-224-5185



When Mr. Yokozawa, our founder and CEO of Nippon Bital Co., Ltd. was conducting research activities at the university in the 2000s,  in order to facilitate his bacterial research activity, he started looking for a mechanism to take daylight into the room. After taking over his family business, Mr. Yokosawa continued to develop the mechanism as a part of his life work research. He finally invented a new system and issued a related patent in 2012. In 2018, he eventually established the company for business development of this system.

May 2012   

Mr. Yokosawa invented the sunlight tracking and collecting system, called an "Insect Compounded Eye Sensor", which applies the insect eye function. He submitted the patent application of the system in Japan and global.

June 2015  

Received the patent publication of daylight tracking and collecting system

June 2018  

Founded  Nippon Bital Co., Ltd. to start business development of the optical fiber natural daylighting system and research further on "Nature technology"

May 2019  

Honorary received the award at Mebuki Financial Group's business contest



Hirotsugu Yokosawa



Research & Invention


Degree on specializing in microorganisms and enzymes


Researched at Environmental Toxicology Laboratory at Los Angeles County, Department of Public Health

Researched on water quality improvement that promotes natural purification


Invented "Bio Egg" to improve the quality of water utilizing microorganisms

Applied the patent on a method for improving the environment and quality of water by using microorganisms

Founded Hiro Bio Systems Co., Ltd.


Visiting Researcher at Tokyo University of Agriculture

Researched on optimal environmental conditions for environmental pollutants

Transfered Hiro Bio Systems Co., Ltd. to

Japan Enzyme Engineering Research Co., Ltd.


Researched under Professor Yasunori Nakamura at Akita Prefectural University,  

Researched on polluted rice (the research approved by Japan Science and Technology Agency


Applied the patent for virus control agent containing silver-chloro complex with long-lasting efficacy against Norovirus 


Suspended the activities of Japan Enzyme Engineering Research Co., Ltd. due to his family business


Researched under Dr. Park at YONSEI University

Researched on inorganic silver complex 


Applied the patent on sunlight detection device and sunlight receiving system


Founded Nippon Bital Co., Ltd.


June 2019



Reported on Deloitte Touche Tohmatsu Limited's Support Project Activity Report Case study

January 2020

Reported on Nikkan Kogyu Shinbun, a Japanese newspaper

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