Reducing toning spacing sensitivity

摘要

A method for reducing toning spacing sensitivity in an electrophotographic process is disclosed. The method includes providing a rotating magnetic member within a conductive non-magnetic development sleeve; providing a developer to the non-magnetic development sleeve for use with the rotating magnetic member including: i) hard magnetic particles with a coercivity of greater than 300 oersted and an induced moment of less than 20 emu per gram at an applied field of 1000 oersted; and ii) soft magnetic particles with a coercivity of less than 300 oersted and an induced moment of greater than 20 emu per gram an applied field of 1000 oersted; and iii) toner particles. The method further includes moving a charged receiving medium into a toner transfer relationship with the developer on the non-magnetic development sleeve so as to provide a developed image on the receiving medium with reduced toning spacing sensitivity.

主权项

1. A method for reducing toning spacing sensitivity in an electrophotographic process comprising:
(a) providing a rotating magnetic member within a conductive non-magnetic development sleeve; (b) providing a developer to the non-magnetic development sleeve for use with the rotating magnetic member including:
(i) hard magnetic particles with a coercivity of greater than 300 oersted and an induced moment of less than 20 emu per gram at an applied field of 1000 oersted;(ii) soft magnetic particles with a coercivity of less than 300 oersted and an induced moment of greater than 20 emu per gram an applied field of 1000 oersted; and(iii) toner particles; c) treating the hard magnetic particles in a magnetic field to lower the induced moment to less than 20 emu per gram at an applied field of 1000 oersted before providing the developer to the non-magnetic development sleeve; and (d) moving a charged receiving medium into a toner transfer relationship with the developer on the non-magnetic development sleeve so as to provide a developed image on the receiving medium with reduced toning spacing sensitivity.