Takehiko Okubo

Title: The Innovations of Takehiko Okubo

Introduction

Takehiko Okubo is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of electrophotography, holding a total of five patents. His work has advanced the technology used in printers, showcasing his expertise and innovative spirit.

Latest Patents

One of Okubo's latest patents is an electrophotographic printer featuring a transferring device with a control mode. This invention includes a sensor that detects the leading edge of the print medium. A position counter measures the time required for the print medium to advance from the sensor to the photosensitive drum. Additionally, the position counter tracks the time for the print medium to move past the photosensitive drum. The distance of the toner image from the leading edge of the print medium is determined based on the image data of the print data. Furthermore, a row counter counts the number of dots in the direction of transport, while a column counter counts the dots in a perpendicular direction. The controller switches the transferring device from constant current control mode to constant voltage control mode just before the first line is printed, ensuring accurate toner image transfer.

Another notable patent is for a multivoltage power supply and its control method. This invention can output multiple high voltages in parallel. The voltage values are fed back to an A/D converter, where each feedback signal is converted to a digital signal. The difference between this digital signal and a predetermined output voltage is calculated as a digital value. This value is then inputted to an auto-reload timer, producing a pulse signal with a width corresponding to the digital value at a set frequency.

Career Highlights

Throughout his career, Takehiko Okubo has worked with notable companies such as Oki Electric Industry Co., Ltd. and Oki Data Corporation. His experience in these organizations has allowed him to refine his skills and contribute to significant advancements in printing technology.

Collaborations

Okubo has collaborated with talented individuals in his field, including Katsuyuki Ito and Shinichi Katakura. These partnerships have fostered innovation and have been instrumental in the development of his patented technologies.

Conclusion

Takehiko Okubo's contributions to the field of electrophotography are noteworthy and impactful. His innovative patents reflect his dedication to advancing printing technology. His work continues to influence the industry and inspire future inventors.