Tokyo, Japan

Ryoji Kumaki

This inventor holds 2 USPTO granted patents. Top assignee: Other. Active years: 2004.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Ryoji Kumaki. Retrieved from https://idiyas.com/inventor/ryoji-kumaki

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile


% Patents Active = 50.0

Average Co-Inventor Count = 9.0

ph-index = 2

Forward Citations = 13(Granted Patents)


Company Filing History:

goldMedal2 out of 834,513 
Other
 patents

Years Active: 2004

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2 patents (USPTO):Explore Patents

Title: Ryoji Kumaki: Innovator in Focusing State Determination Technology

Introduction

Ryoji Kumaki is a notable inventor based in Tokyo, Japan. He has made significant contributions to the field of optical technology, particularly in devices that determine the focusing state of taking lenses. With a total of 2 patents, his work showcases innovative solutions to common challenges in imaging technology.

Latest Patents

Kumaki's latest patents include a device for determining the focused state of a taking lens. This device utilizes focusing state determination imaging elements that are separate from the video imaging element. By capturing object light entering the taking lens, the device determines the focusing state based on luminance signals. It effectively prevents errors in determination caused by saturation of luminance signals when imaging high-luminance objects. The device also features an automatic gain control circuit that adjusts the gains of the luminance signals to avoid saturation levels. Another patent involves a beam splitter that separates a green light beam for high-accuracy focusing state determination, utilizing three imaging elements to capture the directed green light beam.

Career Highlights

Throughout his career, Ryoji Kumaki has focused on advancing optical technologies. His innovative approaches have led to the development of devices that enhance the accuracy and reliability of imaging systems. His patents reflect a deep understanding of the challenges faced in the field and a commitment to finding effective solutions.

Collaborations

Kumaki has collaborated with notable colleagues, including Masao Wada and Tetsuji Inoue. These partnerships have contributed to the development of his innovative technologies and have fostered a collaborative environment for advancing optical research.

Conclusion

Ryoji Kumaki's contributions to the field of optical technology, particularly in focusing state determination, highlight his innovative spirit and dedication to improving imaging systems. His patents serve as a testament to his expertise and commitment to advancing technology in this area.

Profile summary based on public USPTO records.
Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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