Shigeki Iguchi

Title: Shigeki Iguchi: Innovator in Coordinate Input Technology

Introduction

Shigeki Iguchi is a prominent inventor based in Ikoma, Japan. He has made significant contributions to the field of coordinate input technology, holding a total of 6 patents. His innovative work focuses on enhancing the functionality and reliability of coordinate input devices.

Latest Patents

One of his latest patents involves preventing noise in a coordinate input device by reducing or suspending the d.c. voltage supplied to an inverter power source that drives a light source. This invention ensures that light from the source is directed uniformly from the back side of a liquid crystal panel. During the display period, when an image is shown on the panel and a position detection pen is nearby, coordinates are calculated based on the induced voltage from the pen and the timing of the scanning voltage applied to the panel. By suspending or reducing the light source's driving during the position detection period, noise from the inverter power source is effectively prevented from interfering with the position detection pen.

Another notable patent by Iguchi is for a coordinate inputting apparatus that features shared line combinations of power. This apparatus includes a separating circuit, a cable, and a position indicating pen. The separating circuit utilizes a low pass filter to eliminate alternating current components from the signal transmitted to the signal line, while a band pass filter allows only the position information signal within a specific frequency band to pass through. The cable is designed with a signal line, a switching signal line, and a ground line, facilitating power supply and signal transmission between the position indicating pen and the detecting circuits.

Career Highlights

Shigeki Iguchi is currently employed at Sharp Kabushiki Kaisha Corporation, where he continues to develop innovative technologies. His work has significantly impacted the design and functionality of coordinate input devices, making them more efficient and user-friendly.

Collaborations

Iguchi has collaborated with notable coworkers, including Shinji Tsugei and Katsumi Hirano. Their combined expertise has contributed to the advancement of technology in their field.

Conclusion

Shigeki Iguchi's contributions to coordinate input technology through his patents and collaborations highlight his role as a key innovator in the industry. His work continues to influence the development of more effective and reliable input devices.