Location History:
- Shizuoka-ken, JP (2001 - 2005)
- Fujinomiya, JP (2005)
- Shizuoka, JP (1994 - 2009)
Company Filing History:
7 out of 16,458 
1 out of 16,042 
Years Active: 1994-2009
Title: Innovations of Yukio Shirokura in Plastic Optical Fiber Technology
Introduction
Yukio Shirokura is a prominent inventor based in Shizuoka, Japan. He has made significant contributions to the field of optical fiber technology, holding a total of 8 patents. His innovative work focuses on the development of plastic optical fibers, which have various applications in telecommunications and data transmission.
Latest Patents
One of his latest patents is for a plastic optical fiber and the production method thereof. This invention involves forming a cylindrical outer clad section through melt-extrusion molding of polyvinylidene fluoride (PVDF). The molecular structure of the PVDF is designed to ensure that the number of defect bonds of successive CF units and successive CH units constitutes not less than 4% of the total number of bonds. Following this, an inner clad section forming material is polymerized within the outer clad section to create a cylindrical inner clad section. A core section forming material is then filled into the inner clad section and polymerized to form the core section, resulting in a preform that is heat-drawn to obtain a plastic optical fiber (POF). The POF features an outer clad with small spherocrystals, and the average roughness of the inner wall of the outer clad is less than 0.10 μm.
Another notable patent is for a plastic fiber-optic cable and the method of producing it. In this invention, a clad is produced by polymerizing methyl methacrylate and (meth)acrylic acid ester with an alicyclic hydrocarbon group. The core is created using an interfacial-gel-polymerization method. A thin first covering layer is formed on the outer surface of the clad to produce a single-fiber optical cable. Multiple single-fiber optical cables are then bundled together, with gaps infused with a filler. Finally, a second covering layer is applied to create a multi-fiber optical cable, which boasts excellent flexibility and reduced bending loss due to its thin covering layer.
Career Highlights
Yukio Shirokura has worked with notable companies such as Fuji Photo Film Company, Limited and Fujifilm Corporation. His experience in these organizations has contributed to his expertise in optical fiber technology and innovation.
Collaborations
Throughout his career, Shirokura has collaborated with talented individuals, including F
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.