Location History:
- Yuki, JP (1991 - 1992)
- Tochigi, JP (1986 - 1998)
Company Filing History:
2 out of 1,641 
2 out of 3 
1 out of 7 
Years Active: 1986-1998
Title: Hiroyoshi Yokoyama: Innovator in Printed Wiring Board Technology
Introduction
Hiroyoshi Yokoyama is a notable inventor based in Yuki, Japan. He has made significant contributions to the field of printed wiring board technology, holding a total of 4 patents. His innovative methods have advanced the manufacturing processes in this critical area of electronics.
Latest Patents
Yokoyama's latest patents include a method of manufacturing multilayer printed wiring boards. This method involves creating an internal wiring circuit on a board, followed by an insulating resin layer. A blind hole is formed in the insulating resin layer, which communicates with the internal wiring circuit. A conductive portion is then created on the inner wall of the blind hole, connecting it to the internal wiring circuit. Notably, the blind hole is formed using a short-pulse CO₂ laser. Another significant patent is the process for producing printed wiring boards. This process utilizes a composite film comprising an additive layer and an insulating layer containing epoxy resin and synthetic rubber as major components. This innovation allows for the production of printed wiring boards with higher circuit density and reliability in a simple and effective manner.
Career Highlights
Throughout his career, Yokoyama has worked with prominent companies such as Hitachi Chemical Company, Ltd. and Hitachi, Condenser Co., Ltd. His experience in these organizations has contributed to his expertise in the field of printed wiring boards.
Collaborations
Yokoyama has collaborated with notable colleagues, including Toshiro Okamura and Shin Takanezawa. These partnerships have likely fostered innovation and development in their shared field of expertise.
Conclusion
Hiroyoshi Yokoyama's contributions to printed wiring board technology through his patents and career achievements highlight his role as a significant innovator in the electronics industry. His work continues to influence advancements in manufacturing processes and product reliability.