Hiroyuki Hishiyama

Title: Innovations of Hiroyuki Hishiyama

Introduction

Hiroyuki Hishiyama is a notable inventor based in Tokyo, Japan. He has made significant contributions to the field of optical disc technology and delay time regulation circuits. With a total of three patents to his name, Hishiyama's work reflects a commitment to advancing technological solutions.

Latest Patents

One of Hishiyama's latest patents is an "Apparatus and method for controlling optical disc write power." This invention features a simply structured apparatus that corrects an overdrive power level. A main controller allows an overdrive power generator to set an overdrive power current to zero. It also enables a base power controller to manage a base power current with a target value set to a desired overdrive power level. Once the base power monitor level reaches the target value, the main controller permits the overdrive power generator to increase the overdrive power current until a monitored base power control signal reaches a value corresponding to the desired base power level.

Another significant patent is the "Delay time regulation method and delay time regulation circuit." This invention sets the delay time of a variable delay circuit to a desired value by sequentially applying a plurality of clocks of different frequencies. It involves finding the amount of change in delay time concerning a delay time selection signal, determining a linear coefficient of the delay time characteristic, and calculating the delay time selection signal based on these findings.

Career Highlights

Hiroyuki Hishiyama has worked with prominent companies such as NEC Corporation and TEAC Corporation. His experience in these organizations has contributed to his expertise in developing innovative technologies.

Collaborations

Hishiyama has collaborated with notable coworkers, including Misao Fukuda and Keishi Ueno. Their joint efforts have likely fostered a creative environment that encourages innovation.

Conclusion

Hiroyuki Hishiyama's contributions to technology, particularly in optical disc control and delay time regulation, showcase his inventive spirit and dedication to advancing the field. His patents reflect a deep understanding of complex systems and a commitment to improving technological processes.