Location History:
- Hitachi, JP (2008 - 2013)
- Ibaraki, JP (2014)
Company Filing History:
14 out of 836 
2 out of 2,208 
2 out of 2,145 
Years Active: 2008-2014
Title: Seiji Kojima: Innovator in Optical Connector Technology
Introduction
Seiji Kojima is a prominent inventor based in Hitachi, Japan, known for his significant contributions to optical connector technology. With a total of 17 patents to his name, Kojima has made remarkable advancements that enhance the efficiency and reliability of optical fiber connections.
Latest Patents
Kojima's latest patents include innovative designs for optical connectors. One notable invention involves an optical connector where the end faces of a pair of ferrules, which hold multiple optical fibers, are aligned using two guide pins. This design allows the end faces to butt against each other, ensuring a secure connection of the optical fibers. An urging member is incorporated to push the end faces together, while the end faces are ground at an angle. The gap between the guide pins and the guide holes is meticulously designed to be larger than 0.004 mm and smaller than or equal to 0.008 mm. This precision significantly reduces the powder generated by friction during the insertion of guide pins, leading to minimal connection loss even with frequent disconnections, thus eliminating the need for cleaning.
Another of his recent patents focuses on an optical fiber connecting part that features a ferrule with a guide bore. This guide bore is designed to facilitate the insertion of an optical fiber. It includes a first bore at one end for fiber insertion, a second bore at the opposite end with a smaller inner diameter, and an intermediate bore connecting the two. Notably, the center axis of the second bore is intentionally shifted from that of the first bore, enhancing the overall functionality of the connector.
Career Highlights
Throughout his career, Seiji Kojima has worked with notable companies such as Hitachi Cable, Inc. and Fuji Jukogyo Kabushiki Kaisha. His experience in these organizations has allowed him to develop and refine his innovative ideas in optical technology.
Collaborations
Kojima has collaborated with talented individuals in the field, including Kanako Suzuki and Yoshikazu Namekawa. Their joint efforts have contributed to the advancement of optical connector technology.
Conclusion
Seiji Kojima's work in optical connector technology exemplifies innovation and dedication to improving optical fiber connections. His patents reflect a deep understanding of the technical challenges in the field and provide solutions that enhance performance and reliability.