Company Filing History:
Years Active: 1986-2000
Title: Yasuhei Shimada: Innovator in Piezoelectric Technology
Introduction
Yasuhei Shimada is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of piezoelectric technology, holding a total of 12 patents. His innovative work has paved the way for advancements in various applications, particularly in driving cold cathode tubes.
Latest Patents
Shimada's latest patents include an inverter and method for driving a plurality of cold cathode tubes. This invention features a drive circuit for a piezoelectric transformer that includes a master block with a drive frequency control circuit. This circuit controls the frequency of the drive voltage for the piezoelectric transformer. Additionally, it has at least one slave block that receives the output from the master block and includes a drive voltage control circuit. This circuit manages the peak value of the drive voltage for the piezoelectric transformer. The design also incorporates a PWM-modulation circuit for the drive voltages applied to the piezoelectric transformers, ensuring that the drive voltages are in phase. Furthermore, it includes a circuit to suppress harmonic components of the light adjusting frequency in the drive voltages. This innovative arrangement allows for the elimination of limitations in the number of tubes that can be lit, reduces brightness discrepancies, and prevents flickering and audible sound generation.
Another notable patent is the piezoelectric transformer driver. In this invention, a rectified voltage from the output current of the piezoelectric transformer is compared with a reference voltage. The system adjusts the oscillation frequency of a voltage-controlled oscillator to increase or reduce the output voltage of the piezoelectric transformer. This dynamic adjustment ensures optimal performance, even when the load is open-circuited.
Career Highlights
Throughout his career, Yasuhei Shimada has worked with notable companies such as NEC Corporation and Nippon Electric Co., Ltd. His experience in these organizations has contributed to his expertise in the field of electrical engineering and innovation.
Collaborations
Shimada has collaborated with esteemed colleagues, including Nobuaki Honbo and Shingo Kawashima. Their combined efforts have led to advancements in piezoelectric technology and its applications.
Conclusion
Yasuhei Shimada's contributions to the field of piezoelectric technology are noteworthy. His innovative patents and collaborations have significantly impacted the industry, showcasing his dedication to advancing