Company Filing History:
5 out of 227 
3 out of 42,485 
Years Active: 2003-2006
Title: Kei Yasuna: Innovator in Magnetic Disk Technology
Introduction
Kei Yasuna is a prominent inventor based in Chiyoda, Japan, known for his significant contributions to magnetic disk technology. With a total of 8 patents to his name, Yasuna has made remarkable advancements in the field, particularly in the areas of magnetic disk apparatus and servo signal recording methods.
Latest Patents
Yasuna's latest patents include innovative technologies such as a magnetic disk apparatus capable of generating a reference clock signal without relying on an external reference. This is achieved by writing a clock track only once using the head of the magnetic disk apparatus, even if the head is of a read/write element separation type. The recorded clock track is played back to measure the total number of clock bits in one revolution, allowing for precise determination of the time interval between servo sectors. Another notable patent is a magnetic disk apparatus and a servo pattern recording method that enables high-quality writing of servo signals, unaffected by fluctuations in rotation speed during the self-servo write operation. This invention includes a magnetic disk, a head with both write and read elements, and an actuator for positioning the head accurately on the disk.
Career Highlights
Throughout his career, Kei Yasuna has worked with esteemed companies such as Hitachi Global Storage Technologies Japan, Ltd. and Hitachi, Ltd. His work has significantly impacted the development of magnetic storage technologies, enhancing the efficiency and reliability of data storage solutions.
Collaborations
Yasuna has collaborated with notable colleagues, including Takashi Yamaguchi and Kenichiro Sugiyama, contributing to various projects that have advanced the field of magnetic disk technology.
Conclusion
Kei Yasuna's innovative work in magnetic disk technology has led to several patents that enhance data storage capabilities. His contributions continue to influence the industry, showcasing the importance of innovation in technology.
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