Ricoh Company, Ltd.

Zenjiro Okuno

Masaomi Sasaki

Mitsuru Hashimoto

Masafumi Ohta

Wasaburo Ohta

Koji Hirakura

Akio Kozima

Itsuo Ikeda

A photosensitive material for use in electrophotography which comprises a conductive support, a first layer consisting essentially of a substance capable of generating a conductive carrier through light absorption and an electron donor or an electron acceptor, and a second layer consisting essentially of an electron acceptor or an electron donor, to wit, a substance constituting the opposite party of the electron donor or the electron acceptor contained in the first layer, said first and second layers being formed in that order on said conductive support.

Electrophotographic photosensitive material with electron donors and

In controlling the operation of an electrostatic apparatus to produce a large number of copies from an electrostatic image in a multiple copy process there is utilized a toner substance comprising a magnetic carrier composition in which each particle of the composition comprises a ferromagnetic material and a resin, the effective conductivity of the composition being determined by testing means separate from the electrostatic apparatus such that the effective conductivity is measured while the composition is free of absorbed water vapor and other gases encountered under operating conditions with the electrostatic apparatus.

Toner composition for multiple copy electrostatic photography

Growing community of inventors

Tokyo, Japan

Zenjiro Okuno