Takefumi Hara is a prominent inventor based in Minami-ashigara, Japan. He has made significant contributions to the field of photography, particularly in the development of photographic emulsions. With a total of 11 patents to his name, Hara's work has had a lasting impact on the industry.

Latest Patents

Hara's latest patents include an internal latent image-type direct positive silver halide photographic emulsion. This emulsion comprises a silver halide grain designed with a composite structure, where the iodide content on the surface is higher than that within the grain. The average iodide content across all grains is less than 1.0 mol %, with specific amounts of iodide supplied for the surface phase. Additionally, he has developed a color diffusion transfer light-sensitive material utilizing this emulsion. Another notable patent is a method for producing silver halide emulsion and photographic material. This method involves grains with an aspect ratio ranging from 1.5 to 100, occupying a significant portion of the total projected area. The process includes nucleation, ripening, and grain growth in a dispersion medium containing low molecular weight gelatin and chemically modified gelatin.

Career Highlights

Hara is currently associated with Fuji Photo Film Company, Limited, where he continues to innovate in photographic technology. His work has been instrumental in advancing the quality and functionality of photographic materials.

Collaborations

Hara has collaborated with notable coworkers, including Hideo Ikeda and Sadanobu Shuto, contributing to various projects and advancements in the field.

Conclusion

Takefumi Hara's contributions to photographic emulsions and materials have established him as a key figure in the industry. His innovative patents and ongoing work at Fuji Photo Film Company, Limited, continue to shape the future of photography.

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