Haruo Koizumi

Title: Haruo Koizumi: Innovator in Microprocessor Technology

Introduction

Haruo Koizumi is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of microprocessor technology, holding a total of four patents. His work has had a profound impact on the development of integrated circuits and logic systems.

Latest Patents

One of Koizumi's latest patents is a microprocessor chip utilizing two-level metal lines technology. This innovative chip includes a ROM portion for storing a microprogram, an execution unit for performing arithmetic operations, and random logic circuits positioned between the ROM and execution unit. The two-level metal lines technology is essential for supplying power and grounding, as well as for providing input/output interconnect lines for the random logic circuits.

Another notable patent is a method for diagnosing integrated logic circuits. This method involves supplying a test signal to the logic circuit and detecting input and output signals from function blocks using contactless probing devices, such as electron beam or laser beam probing devices. The process includes simulating normal logic operations and comparing detected output signals with simulated ones to determine the functionality of the blocks. If abnormalities are found, the method allows tracing back to faulty function elements through repeated detection and comparison.

Career Highlights

Haruo Koizumi is currently employed at Hitachi, Ltd., where he continues to innovate and develop advanced technologies. His expertise in microprocessor design and logic circuit diagnosis has positioned him as a key figure in the tech industry.

Collaborations

Throughout his career, Koizumi has collaborated with notable colleagues, including Yoshimune Hagiwara and Hideo Nakamura. These partnerships have fostered a collaborative environment that encourages innovation and the sharing of ideas.

Conclusion

Haruo Koizumi's contributions to microprocessor technology and integrated circuit diagnostics highlight his role as a leading inventor in the field. His patents reflect a commitment to advancing technology and improving the functionality of electronic systems.