Yokohama, Japan

Keiji Ohtaka

This inventor holds 69 USPTO granted patents and 1 EPO patent, primarily in Optical Systems (CPC class 3544). Top assignees: Canon Kabushiki Kaisha, Other. Active years: 1983-2007.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Keiji Ohtaka. Retrieved from https://idiyas.com/inventor/keiji-ohtaka

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


% Patents Active = 91.3


Average Co-Inventor Count = 3.1

ph-index = 19

Forward Citations = 1,090(Granted Patents)

Forward Citations (Not Self Cited) = 960(Dec 10, 2025)


Inventors with similar research interests:


Location History:

  • Tokyo, JP (1983 - 1999)
  • Yokohama, JP (1990 - 2006)
  • Kanagawa, JP (1985 - 2007)
  • Kanagawa-ken, JP (2006 - 2007)

Company Filing History:


Years Active: 1983-2007

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Areas of Expertise:
Polarization Beam Splitter
Optical Device
Focus Detection
Image Display Apparatus
Camera Technology
Anti-Fog Coating
Semiconductor Photo-Sensor
Light Emission Device
Projection Systems
Optical Apparatus
Focus State Detection
Image Sensing
69 patents (USPTO):Explore Patents

Title: The Innovative Contributions of Keiji Ohtaka

Introduction: Keiji Ohtaka, based in Yokohama, Japan, is a prolific inventor with an impressive portfolio comprising 69 patents. His work primarily focuses on advancements in optical technologies, including complex systems that enhance the performance of optical devices.

Latest Patents: Ohtaka's latest innovations include a "Polarization Beam Splitter and Optical System Using the Same," which features a specialized polarized beam splitting layer. This layer consists of a series of gratings that are arranged in a manner to effectively transmit and reflect light based on its polarization direction. Additionally, he has developed a "Polarization Element and Optical Device Using Polarization Element," which offers a high-performance solution for polarization splitting, utilizing distinct periodic structures to manage light transmission and reflection.

Career Highlights: Throughout his career, Keiji Ohtaka has made significant contributions while working with Canon Kabushiki Kaisha, where he applied his expertise to various optical technologies. His innovations have not only advanced the capabilities of devices but have also pushed the boundaries of research in the optical field.

Collaborations: Ohtaka has collaborated with notable individuals in the field, including Yasuo Suda and Akira Ishizaki. These collaborations have further expanded his reach in the context of inventor projects and patent applications, culminating in high-impact inventions that benefit various applications in optics.

Conclusion: The work of Keiji Ohtaka exemplifies the spirit of innovation in optical technology. With a robust patent portfolio and collaborative efforts enhancing his inventions, Ohtaka continues to lead in the development of cutting-edge optical systems that hold promise for future advancements. His commitment to research and innovation underscores his significance within the field.

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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