| 摘要 |
To provide a developing device capable of preventing excess charge of the toner particles so as to prevent occurrence of failure caused by an decrease in toner flying property between the developing roller and photoconductor or a change in development characteristics, a developing device according to the present invention develops non-magnetic mono component toner using a developing roller having on its surface a plurality of groove portions each of which includes: a leading end side cut portion formed on the leading end side of the developing roller in the rotational direction thereof and having a leading end side cut angle theta 1; and a trailing end side cut portion formed on the trailing end side of the developing roller in the rotational direction thereof and having a trailing end side cut angle theta 2 and in which a relationship theta 1<theta2 is satisfied.
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