Company Filing History:
4 out of 164,275 
1 out of 39,248 
Years Active: 1989-1995
Title: The Innovations of Makoto Takekoshi
Introduction
Makoto Takekoshi is a prominent inventor based in Yokohama, Japan. He has made significant contributions to the field of optical disk drives, holding a total of five patents. His work focuses on improving the efficiency and reliability of optical disk technology.
Latest Patents
Among his latest patents is a method for focus acquisition in optical disk drives. This invention ensures successful focus acquisition independent of the traveling speed of the objective lens when the focus servo circuit loop is closed. The method involves sending a signal to a focus actuator to bring the objective lens close to an in-focus position while the focus servo circuit loop is open. The loop is then closed by shutting off the signal sent to the focus actuator, adding a predetermined offset to the focus error signal, and detecting when this adjusted signal reaches a predetermined level. The loop is closed upon detection, with a gradual decrease in the offset value.
Another notable patent is for an apparatus controlling an optical disk drive. This apparatus operates under both track following and seek modes. Upon detecting a track following operation error, a seek operation is initiated to find a new target track at a predetermined distance from the current track. The seek operation follows a velocity profile to regain control over the optical head, which may have been jolted into an uncontrolled velocity during the error. The velocity profile allows for reduced speed as the target track is approached, ensuring a smooth transition.
Career Highlights
Makoto Takekoshi has worked with several prestigious companies, including IBM and Fujitsu Corporation. His experience in these organizations has contributed to his expertise in optical technologies and innovations.
Collaborations
He has collaborated with notable coworkers such as Naoyuki Kagami and Hiroaki Kubo, further enhancing his contributions to the field.
Conclusion
Makoto Takekoshi's innovations in optical disk technology demonstrate his commitment to advancing this field. His patents reflect a deep understanding of the challenges in optical systems and provide solutions that enhance performance and reliability.