Daijiro Sumino

Title: Daijiro Sumino: Innovator in Semiconductor Laser Technology

Introduction

Daijiro Sumino is a prominent inventor based in Osaka, Japan. He has made significant contributions to the field of semiconductor laser technology, holding two patents that showcase his innovative approach to electronic dimming functions and laser drive apparatuses.

Latest Patents

Sumino's latest patents include a semiconductor laser driver that features an electronic dimming function without the need for optical components. This invention utilizes a first current generator circuit to produce a variable first current based on a control signal. Additionally, a second current generator circuit limits this first current to create a second current, which is also variable according to a second control signal. A third current generator circuit further limits the second current to generate a third current, which is supplied to the semiconductor laser element. The rates at which the first and second control signals change are designed to be slower than the rate of the third control signal.

Another notable patent is the semiconductor laser drive apparatus and image forming apparatus. This invention includes a current setting circuit that stores various set values for light-emission currents and bias currents. It features a first current generator circuit that produces an input current from the first set value, while a second current generator circuit generates additional input currents from the second and third set values. A switching circuit then supplies the appropriate input currents to the drive circuit based on the light-emission control signal.

Career Highlights

Throughout his career, Daijiro Sumino has worked with notable companies such as Ricoh Electronic Devices Co., Ltd. and Ricoh Company, Ltd. His experience in these organizations has allowed him to refine his skills and contribute to advancements in semiconductor technology.

Collaborations

One of his notable collaborators is Takao Watanabe, with whom he has worked on various projects in the field of semiconductor lasers.

Conclusion

Daijiro Sumino's innovative work in semiconductor laser technology has led to significant advancements in the field. His patents reflect a deep understanding of electronic dimming functions and laser drive systems, showcasing his expertise and commitment to innovation.