Location History:
- Neyagawa, JP (1990)
- Daitoh, JP (1993)
- Daito, JP (1991 - 1994)
- Osaka, JP (1992 - 2004)
Company Filing History:
Years Active: 1990-2004
Title: Innovations by Yoshifumi Ishii
Introduction
Yoshifumi Ishii is a notable inventor based in Daito, Japan. He has made significant contributions to the field of image forming technology, holding a total of 12 patents. His work focuses on enhancing image quality and efficiency in printing systems.
Latest Patents
One of his latest patents is an image forming apparatus with a print head having a variable lighting period. This invention allows the cycle period of a lighting reference clock signal to be variably set according to the tone level of image data. As a result, the lighting period of an LED can be adjusted based on the tone level of the image data, providing a linear characteristic relationship between the image data and the tone level of a formed toner image. This innovation significantly improves image quality.
Another recent patent is a paper supplying device that includes a pair of upper and lower paper supplying rollers. These rollers have a hemicylindrical portion that defines an increased frictional circumferential surface, which provides greater frictional force than the remaining surface of the respective roller. The device features a rotation changeover mechanism that allows the paper supplying rollers to operate in both regular and reverse rotational directions. This design enables flexibility in the order of supply of manuscript sheets, allowing for supply from either the uppermost or lowermost sheet in a bundle.
Career Highlights
Yoshifumi Ishii has worked with several prominent companies throughout his career, including Mita Industrial Co., Ltd. and Kyocera Mita Corporation. His experience in these organizations has contributed to his expertise in developing innovative printing technologies.
Collaborations
He has collaborated with notable coworkers such as Hiroshi Kusumoto and Naruyuki Miyamoto, further enhancing his contributions to the field.
Conclusion
Yoshifumi Ishii's innovative work in image forming technology and his numerous patents reflect his dedication to improving printing systems. His inventions continue to influence the industry and enhance image quality for users worldwide.