This inventor holds 6 USPTO granted patents. Top assignees: Seiko Instruments Inc, Other. Active years: 1992-2004.
Location History:
- Tokyo, JP (1992 - 1995)
- Koto-ku, Tokyo, JP (1998)
- Chiba, JP (1998 - 2004)
Company Filing History:
5 out of 2,903 
1 out of 834,411 Years Active: 1992-2004
Title: Junko Yamanaka: Innovator in Semiconductor Technology
Introduction
Junko Yamanaka is a prominent inventor based in Chiba, Japan. She has made significant contributions to the field of semiconductor technology, holding a total of 6 patents. Her innovative work has paved the way for advancements in electronic circuits and devices.
Latest Patents
One of her latest patents is a charge pump rush current limiting circuit. In this invention, a constant current circuit is placed between an input power supply and an output capacitor. When the power supply is activated, the charge pump circuit's operation is halted, allowing the output capacitor to charge to a specified voltage via the constant current circuit. Once charged, the charge pump resumes normal operation, effectively limiting rush current. This method employs an oscillator circuit with a small duty ratio at startup, transitioning to Pulse Frequency Modulation (PFM) control for reduced rush current compared to conventional methods. Additionally, she has developed a method for manufacturing a semiconductor detector designed for light detection.
Career Highlights
Throughout her career, Junko has worked with notable companies, including Seiko Instruments Inc. Her expertise in semiconductor technology has been instrumental in the development of various electronic components.
Collaborations
Junko has collaborated with esteemed colleagues such as Yutaka Saitoh and Tadao Akamine. Their combined efforts have contributed to the advancement of innovative technologies in the semiconductor industry.
Conclusion
Junko Yamanaka's contributions to semiconductor technology and her innovative patents highlight her role as a leading inventor in her field. Her work continues to influence the development of electronic devices and circuits.