Company Filing History:
Years Active: 1999-2001
Title: Fumitaka Ishikawa: Innovator in Single Crystal Manufacturing
Introduction
Fumitaka Ishikawa is a notable inventor based in Kanagawa, Japan. He has made significant contributions to the field of materials science, particularly in the manufacturing of single crystals. With a total of 4 patents to his name, Ishikawa's work has advanced the understanding and production of high-quality single crystal silicon.
Latest Patents
Ishikawa's latest patents include a method for manufacturing single crystals that provides a technique capable of producing single crystals with an oxygen density of less than 12×10 atoms/cm. This invention ensures that the oxygen density of the produced single crystal is uniformly distributed along its longitudinal axis. The method involves controlling the electrical power input into the main heater and the top heater, which is shaped like a reverse frustrated cone. This control helps maintain the temperature of the melt within a preset range during the process of pulling up the single crystal silicon. Additionally, if a magnetic field is applied to the melt, single crystals with even lower oxygen density can be obtained.
Another significant patent is a simple method for detecting temperature distributions in single crystals. This method involves pulling a single crystal to a length where the beginning of the body has cooled down to below 1000°C. The single crystal is then detached from the molten silicon by pulling it at a high speed. Oxygen precipitation heat-treatment is performed to locate the portion of AOP, which arises at the boundary of grown-in defects. By controlling the speed at which the temperature range near 1100°C is passed through, the occurrence of defects during the growth of the single crystal can be managed effectively.
Career Highlights
Fumitaka Ishikawa is currently employed at Komatsu Electronic Metals Co., Ltd. His work has been instrumental in enhancing the quality and efficiency of single crystal production, which is crucial for various applications in electronics and materials science.
Collaborations
Ishikawa has collaborated with notable coworkers such as Hiroshi Inagaki and Junsuke Tomioka. Their combined expertise has contributed to the advancement of technologies in the field of single crystal manufacturing.
Conclusion
Fumitaka Ishikawa's innovative approaches to single crystal manufacturing have made a significant impact in the field. His patents reflect a deep understanding of materials science and a commitment to advancing technology. His