Bridgestone Corporation

Takuya Morooka

Koji Takagi

Shuyou Akama

Kiyoshi Sakayori

A developing roller includes an ultraviolet-curing type resin layer and using a carbon-based electrically conducting agent for giving an electrical conductivity to the resin layer, as well as an imaging apparatus using the same. The developing rollerincludes a shaft memberincluding a hollow cylindrical body or a solid cylindrical body of a resin containing an electrically conducting agent and a resin layer. The resin layeris made of a resin having fine particles dispersed therein, wherein a ratio a/b of average particle size of fine particles a to a total thickness of resin layers b is greater than 2.0 and less than or equal to 5.0.

Developing roller and imaging apparatus using the same

A lock nut of the present invention comprises a metal nut base body and a synthetic resin portion, an internally threaded portion having a diameter smaller than that of an internally threaded portion of the nut base body and extending therefrom being formed in a cap-like portion formed at one end of the nut base body. This lock nut can prevent the occurrence of looseness after the lock nut has been fastened.

Growing community of inventors

Fujisawa, Japan

Takuya Morooka