Location History:
- Ukyo-ku, JP (1997)
- Kyoto, JP (1993 - 2008)
Company Filing History:
Years Active: 1993-2008
Title: Hiroyuki Funahashi: Innovator in Signal Processing Technologies
Introduction
Hiroyuki Funahashi is a prominent inventor based in Kyoto, Japan. He has made significant contributions to the field of signal processing, particularly in the development of circuits that enhance the functionality of optical devices. With a total of 7 patents to his name, Funahashi continues to push the boundaries of innovation in his field.
Latest Patents
One of Funahashi's latest patents is a signal generating circuit and optical pickup device. This invention includes a current polarity switch circuit that receives an output current from a light-sensitive element. It outputs a current with a constant direction, regardless of the received current's direction. Additionally, a current-to-voltage conversion circuit converts the current outputted from the polarity switch into a voltage. A signal processing circuit then generates a signal based on this voltage, allowing for consistent signal generation regardless of the received current's direction.
Another notable patent is for a current-to-voltage conversion IC and a photoelectric conversion IC. This invention aims to maintain a broad frequency range even as the conversion gain increases. It features a differential amplifier with a variable resistance negative feedback resistor and a photodiode connected to its input terminal. The differential amplifier is equipped with a switch that varies the capacitance of a capacitor used for phase compensation, allowing for interlocked adjustments of resistance and capacitance based on external signals.
Career Highlights
Hiroyuki Funahashi is currently employed at Rohm Co., Ltd., where he applies his expertise in circuit design and signal processing. His work has been instrumental in advancing technologies that are crucial for modern optical devices.
Collaborations
Throughout his career, Funahashi has collaborated with notable colleagues, including Ichiro Yokomizo and Isao Yamamoto. These partnerships have fostered innovation and contributed to the successful development of various technologies.
Conclusion
Hiroyuki Funahashi is a distinguished inventor whose work in signal processing has led to significant advancements in optical technologies. His innovative patents reflect his commitment to enhancing the functionality and efficiency of electronic devices.