Takehiko Hamada

Title: Takehiko Hamada: Innovator in Position Detection and Semiconductor Analysis

Introduction

Takehiko Hamada is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the fields of position detection systems and semiconductor memory device analysis. With a total of 9 patents to his name, Hamada's work has had a substantial impact on technology and innovation.

Latest Patents

Hamada's latest patents include a position detecting system and method. In this system, an electron beam is irradiated to a sample that includes a portion to be measured. The electron beam is caused to move in relation to the portion to be measured in the sample. Additionally, a voltage is applied to the sample scanned by the electron beam, and the current flowing in the sample due to the applied voltage is detected. This allows for the determination of the position of the portion to be measured based on the scanning start position of the electron beam and the position where the detected current changes.

Another notable patent is the failure analysis system for semiconductor memory devices. In this method, the absolute value of a position difference between two fail bits of a two-dimensional bit map is calculated while updating a histogram corresponding to this position difference. The bit map indicates a map of fail bits, with each fail bit corresponding to a fail memory cell. The calculation is repeated for all combinations of two fail bits in the bit map. An expectation function value is then calculated for each value from the histograms and the number of fail bits. Finally, the regularity or irregularity of the fail bits is determined based on the calculated expectation function value.

Career Highlights

Hamada has worked with notable companies such as NEC Corporation and NEC Electronics Corporation. His experience in these organizations has contributed to his expertise in the field of electronics and innovation.

Collaborations

Some of Hamada's coworkers include Masayuki Hamada and Hiroaki Ohkubo. Their collaboration has likely fostered an environment of innovation and creativity in their respective projects.

Conclusion

Takehiko Hamada's contributions to technology through his patents and work in the semiconductor field highlight his role as a significant inventor. His innovative approaches to position detection and failure analysis continue to influence advancements in technology.