Yasuo Tosaka

Title: Yasuo Tosaka: A Pioneer in Photographic Innovations

Introduction

Yasuo Tosaka, an accomplished inventor based in Odawara, Japan, has made significant contributions to the field of photography through his innovative work in silver halide light-sensitive materials. With a remarkable portfolio of 21 patents, he has been at the forefront of developing advanced photographic technologies that enhance image quality and sensitivity.

Latest Patents

Among Tosaka's latest patents is a novel silver halide light-sensitive color photographic material and process. This innovation features a reflective support with a hydrophilic colloid layer containing a white pigment and multiple silver halide emulsion layers. Notably, one of the silver halide emulsion layers demonstrates a spectral sensitivity maximum at a wavelength of 730 nm or more, with primary particle sizes of the white pigment being 0.30 µm or greater.

Another significant patent is the silver halide color photographic light-sensitive material, which consists of a support with several silver halide emulsion layers. The first layer forms yellow images, the second forms magenta, and the third creates cyan images. Importantly, one of these layers includes a fourth silver halide emulsion with an optical density of 0.7 or more after development, ensuring exceptional image quality.

Career Highlights

During his career, Yasuo Tosaka has worked for prominent companies in the photography industry, including Konica Corporation and Konishiroku Photo Industry Co., Ltd. His expertise and dedication to innovation have facilitated advancements in the realm of photographic materials, making him a noteworthy figure in the sector.

Collaborations

Throughout his career, Tosaka has collaborated with notable colleagues, including Keiji Ogi and Yoshiyuki Nonaka, further enriching his contributions to the field. These collaborations have played a pivotal role in driving forward the research and development of high-quality photographic materials.

Conclusion

Yasuo Tosaka’s work exemplifies the spirit of innovation within the photographic industry. His 21 patents, particularly in silver halide light-sensitive materials, highlight his commitment to enhancing photographic technology. As he continues to push the boundaries of photography, Tosaka remains a prominent figure in the landscape of inventions and innovations.