Abstract
Canon NP electrophotography (NP-system) was developed in 1965, which was different method from Carlson process. NP system is characterized by simultaneous image exposure and AC discharge, it is different from the Carlson method. We developed many kinds of products using NP system. To solve many problems for products, we had a lot of peripheral technologies. CdS was used for a photoconductive material. The photosensitive plate of NP process contains three layers. It comprises a conductive base, a photoconductive layer, and an insulating layer. The photosensitive plate had so wide range of wavelength-sensitivity that it applied for laser printers and color copiers.
We had developed a rubber blade cleaning system. The insulating layer of the photosensitive plate was so hard that the photosensitive plate was rubbed by the rubber blade. This rubber blade cleaning system is used to almost of copier now. This techniques become long-lived.
In the NP system, an insulating layer has an electrostatic latent image, which enables having the electrostatic image on the photosensitive plate for a long time. This characteristic is applied to the screen process technology. And we were commercialized a mono-color high-speed copiers.
NP system, the potential of electrostatic image was influenced by the environment circumstances. So we developed a sensor to detect the potential on the photoconductive plate and controlled the potential. This technology was used for the color copying machine, because no color-changing is allowed in the color-copying-machine.
During developing many kinds of products using the NP system, we have being making new technologies to solve many kinds of problem. New system technology like NP system creates the many ideas and the strong mind for the engineers.
