Masahiro Yoshimi

Title: Masahiro Yoshimi: Innovator in Servo Control Technology

Introduction

Masahiro Yoshimi is a prominent inventor based in Tokyo, Japan. He is known for his innovative contributions to servo control technology. His work has significantly impacted the field of automation and control systems.

Latest Patents

Yoshimi holds a patent for a "Servo control apparatus." This invention features a monolithic photosensor array that includes first, second, and third identical photodiodes. A light-emitting diode continuously illuminates the third photodiode. An occluder disc is rotatably driven from the shaft of a servo motor, positioned between the light-emitting diode and the first and second photodiodes. The disc is designed with multiple circumferentially spaced apertures that alternately cover and uncover the photodiodes, producing quasisinosoidal position signals. The position signals from the first and second photodiodes are relatively 90 degrees out of phase. A computing circuit generates a motor shaft velocity command signal based on the required rotation steps from the initial to the desired position. The system progressively reduces the magnitude of the velocity signal in response to the position signals. A differentiating circuit processes the position signals, while a commutator samples the peak values to produce an actual velocity signal. A comparator then compares this velocity signal with the command signal, generating an error signal that drives the motor. Additionally, a sensor monitors the output voltage of the third photodiode, and an intensity control circuit adjusts the current through the light-emitting diode to maintain a predetermined output voltage, compensating for variations in ambient conditions.

Career Highlights

Masahiro Yoshimi is associated with Ricoh Company, Ltd., where he has made significant contributions to the field of servo control technology. His innovative work has garnered attention and respect within the industry.

Collaborations

Yoshimi has collaborated with notable colleagues, including Tomoatsu Imamura and Shigeyuki Araki. Their teamwork has fostered advancements in technology and innovation.

Conclusion

Masahiro Yoshimi's contributions to servo control technology exemplify the spirit of innovation. His patent and collaborative efforts continue to influence the field, showcasing the importance of creativity in engineering.