Location History:
- Kawachinagano, JP (1980 - 1987)
- Osaka, JP (1985 - 2005)
Company Filing History:
31 out of 2,979 
2 out of 2,816 
1 out of 76 Years Active: 1980-2005
Title: Innovations by Yoshio Yuasa: Pioneering Photometric Technology
Introduction
Yoshio Yuasa, a prominent inventor from Kawachinagano, Japan, has made significant contributions to the field of photometric technology. With a remarkable portfolio of 34 patents, Yuasa's innovations have shaped the way we measure and analyze light exposure in photography and related applications.
Latest Patents
Among his latest patents, the "Photometric Apparatus" stands out. This advanced device includes an exposure value calculator that evaluates the exposure based on light data from a photo sensor combined with inputted photosensitivity. It also features an exposure value difference calculator that determines the variance between the calculated exposure value and a reference exposure value. Additionally, a gamma characteristic provider offers a gamma characteristic that articulates the relationship between exposure value differences and gradation values of digital data. A gradation calculator further processes this data to yield specific gradation values related to photographed objects, and an indicator displays these values effectively.
Another notable innovation is his "Exposure Meter," which integrates both incident light and reflected light measurement functions. This versatile meter assesses exposure values based on incident light to the object while also measuring reflected light. It calculates the latitude of a film from the incident light exposure value, exhibiting the exposure value alongside the corresponding upper and lower limits of latitude on a display device. Furthermore, it shows the exposure values from reflected light for comprehensive comparative analysis.
Career Highlights
Yoshio Yuasa's career includes notable stints at esteemed organizations such as Minolta Camera Kabushiki Kaisha and Minolta Company, Ltd. His work in these companies has been instrumental in advancing photometric devices and technologies.
Collaborations
Yuasa has collaborated with skilled professionals such as Kazuhiko Naruse and Nobukazu Kawagoe during his career. Their collective expertise has contributed to the successful development of his innovative products and patents.
Conclusion
Yoshio Yuasa's commitment to innovation in photometric technologies has left an indelible mark on the industry. His numerous patents illustrate his dedication to enhancing the way photographers and technicians understand and utilize light, paving the way for future advancements in the field.