Location History:
- Saitama, JP (1988)
- Yamanashi, JP (1985 - 1991)
Company Filing History:
4 out of 2,861 
2 out of 96 Years Active: 1985-1991
Title: The Innovations of Osamu Kumasaka
Introduction
Osamu Kumasaka is a notable inventor based in Yamanashi, Japan. He has made significant contributions to the field of optical information storage, holding a total of 5 patents. His work has been instrumental in advancing technologies related to optical disks and stampers.
Latest Patents
Kumasaka's latest patents include a method of manufacturing a stamper for the formation of optical information. This method involves preparing a stamper by forming a first electro-conductive layer and a second electro-conductive layer on a photoresist layer that carries pits. The process utilizes physical vapor deposition before the electroforming of a stamper layer. The second electro-conductive layer plays a crucial role in preventing corrosion of the first layer during the electroforming step and even during the storage period prior to this step. Another significant patent is a method of identifying a stamper for an optical information storage disk. This method distinguishes between first and second stampers, with the second stamper being replicated from the first. Each stamper carries recorded information signals and a printed code pattern that represents identifying information. The printed code pattern is read in a specific direction to determine whether a start or stop signal is read first, allowing for the differentiation between the two stampers.
Career Highlights
Throughout his career, Kumasaka has worked with prominent companies such as Pioneer Electronic Corporation and Pioneer Video Corporation. His experience in these organizations has contributed to his expertise in optical technologies and innovations.
Collaborations
Some of Kumasaka's notable coworkers include Nobuki Yamaoka and Minemasa Ota. Their collaborations have likely fostered advancements in the projects they undertook together.
Conclusion
Osamu Kumasaka's contributions to the field of optical information storage through his innovative patents and career experiences highlight his importance as an inventor. His work continues to influence the industry and pave the way for future advancements.