Youjirou Miyahara

Title: Youjirou Miyahara and His Speed-Detection Invention.

Introduction

Youjirou Miyahara is an inventor associated with Hitachi, Ltd., in Hitachi, Japan. His recorded patent concerns a speed-detecting apparatus designed to measure the rotational speed of a mechanically coupled rotating body.

Latest Patents

Miyahara’s listed patent, “Speed Detecting Apparatus,” describes a system that uses an encoder to generate a sine-wave signal as the rotating body changes angular position. The apparatus identifies zero-crossing points in that signal and uses them to determine rotational speed. At high speeds, it calculates speed from the number of zero-crossing pulses and the time interval between pulses. At low speeds, it combines the pulse count within a set period with the signal’s phase angle. Miyahara is credited with 1 patent in the provided information.

Career Highlights

Miyahara’s documented invention addresses speed measurement across both high- and low-speed operating ranges. The approach adapts its calculation method to the operating range, using pulse timing at higher speeds and pulse counts together with phase information at lower speeds.

Collaborations

The provided information lists Tsutomu Omae and Toshihiko Matsuda as Miyahara’s coworkers. It does not specify their roles in developing or patenting the speed-detection apparatus.

Conclusion

Youjirou Miyahara’s recorded patent reflects work on rotational-speed detection, with a method designed to measure speed reliably across different operating ranges.