Location History:
- Fujisawa Kanagawa, JP (2019)
- Yokohama, JP (2019)
- Fujisawa, JP (2003 - 2023)
- Kanagawa, JP (2024)
Company Filing History:
7 out of 265 
6 out of 52,711 
3 out of 599 
Years Active: 2003-2025
Title: Ryoji Tsuda: Innovator in White Light Technology
Introduction
Ryoji Tsuda is a prominent inventor based in Fujisawa, Japan. He has made significant contributions to the field of lighting technology, particularly in the development of white light sources that utilize LEDs and phosphors. With a total of 11 patents to his name, Tsuda's work has advanced the understanding and application of lighting in various environments.
Latest Patents
One of Tsuda's latest patents is a white light source that includes a combination of a light-emitting diode and phosphors. This innovative design features a cerium-activated yttrium aluminum garnet-based phosphor. The patent specifies that there is no light emission spectrum peak where the ratio of the largest maximum value to the minimum value exceeds 1.9. The largest maximum value is defined as the highest among at least one maximum value present in the wavelength range of 400 nm to 500 nm in the light emission spectrum of the white light emitted from the source. Additionally, the minimum value is adjacent to the largest maximum value on the longer wavelength side of the spectrum. Another significant patent involves a method for using the white light source, which allows for the control of daily rhythm and pleasant lighting. This method quantitatively changes the stimulation light emitted to intrinsically photosensitive retinal ganglion cells and visual cells, ensuring optimal lighting conditions.
Career Highlights
Throughout his career, Ryoji Tsuda has worked with notable companies such as Toshiba Materials Co., Ltd. and Kabushiki Kaisha Toshiba. His experience in these organizations has contributed to his expertise in lighting technology and innovation.
Collaborations
Tsuda has collaborated with several professionals in his field, including Hiroyasu Kondo and Tatsunori Itoga. These collaborations have further enriched his work and led to advancements in lighting technology.
Conclusion
Ryoji Tsuda's contributions to the field of white light technology demonstrate his innovative spirit and commitment to enhancing lighting solutions. His patents reflect a deep understanding of the interplay between light and human perception, making him a key figure in the industry.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.