Sakai, Japan

Seiji Yamada

This inventor holds 27 USPTO granted patents, primarily in Camera Exposure Control. Top assignee: Minolta Camera Kabushiki Kaisha. Active years: 1976-1983.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Seiji Yamada. Retrieved from https://idiyas.com/inventor/seiji-yamada

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

Calculating rank

% Patents Active = 100.0

Average Co-Inventor Count = 1.6

ph-index = 11

Forward Citations = 306(Granted Patents)


Location History:

  • Sakai, JA (1976 - 1978)
  • Saki, JP (1980)
  • Sakai, JP (1978 - 1983)

Company Filing History:


Years Active: 1976-1983

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Areas of Expertise:
Exposure Control
Camera Systems
Automatic Focus
Light Measuring
Programmable Exposure
Data Imprinting
Single Lens Reflex
Interchangeable Lenses
Film Dating
Focusing Mechanism
Control Circuit
Photographic Devices
27 patents (USPTO):Explore Patents

Title: Innovations of Seiji Yamada: Pioneering Optical Technologies

Introduction

Seiji Yamada is a prominent inventor located in Sakai, Japan, known for his significant contributions to the field of optical devices. With a remarkable portfolio of 27 patents, he has continuously pushed the boundaries of technology aimed at enhancing photographic equipment.

Latest Patents

Among his most recent innovations are the "Exposure Indicating Device" and the "Focus Condition Indicating System for Use in a Camera." The Exposure Indicating Device is designed to provide simultaneous feedback on both average light measurement and spot light measurement, allowing photographers to gain insight into the lighting conditions of a scene. It displays one measurement numerically while the other highlights a deviation, facilitating more accurate photographic decisions. In addition, the Focus Condition Indicating System integrates a control signal producer that alerts users when the camera's objective lens has moved past the proper focus position, accompanied by an audio signal, enhancing the user's ability to achieve the perfect focus.

Career Highlights

Seiji Yamada has made his mark while working at Minolta Camera Kabushiki Kaisha, a leading company in the imaging and optical industries. His innovative approach has not only contributed to Minolta’s reputation for high-quality photographic equipment but also has propelled advancements in camera technologies that benefit users worldwide.

Collaborations

In his journey of inventions, Yamada has collaborated with renowned engineers, including Yasuhiro Nanba and Mashio Kitaura. These partnerships have fostered a conducive environment for innovation, allowing for the sharing of ideas and the development of cutting-edge technologies that enhance the art of photography.

Conclusion

Seiji Yamada's contributions to the field of optical technology through his numerous patents exemplify his role as a distinguished inventor. His focus on practical applications of photographic equipment continues to influence both professionals and enthusiasts in the world of photography. As innovations like the Exposure Indicating Device and the Focus Condition Indicating System emerge, Yamada remains a key figure in the industry, consistently aiming to improve the photographic experience.

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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