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About

Yutaka Ezaki is a leading engineer in astronomical instrumentation, whose work has been pivotal to the development of the Thirty Meter Telescope (TMT)—one of the next generation of ground-based observatories. His primary research areas encompass telescope structure systems, precision robotics, and advanced force control technologies for large-scale optical components. Ezaki’s major contribution lies in his leadership of the preliminary design for the TMT’s Telescope Structure System (STR), a massive, high-stiffness framework that must support the telescope’s 30-meter primary mirror with nanometer-level stability. In this role, he oversaw the transition of the design from conceptual studies to a detailed engineering blueprint, collaborating with Mitsubishi Electric Corporation to ensure the structure could withstand extreme environmental loads. Beyond structural design, Ezaki developed the force control technology for the TMT’s Segment Handling System (SHS), a robotic subsystem that safely exchanges the telescope’s 492 individual mirror segments. His innovations allow the robot to handle delicate, meter-sized mirrors with precise force feedback, preventing damage during automated replacement. While his most-cited papers (with 13 and 6 citations respectively) are specialized, they represent foundational engineering solutions that enable the TMT’s unprecedented light-gathering power, cementing Ezaki’s role in advancing the frontier of ground-based astronomy.