| 摘要 |
A developing apparatus including a developing frame, a developing roller disposed at an opening portion of the developing frame and adapted for bearing a developing agent, a first seal member for closing a gap between the developing frame and the developing roller along an entire length of the gap in a circumferential direction of the developing roller to prevent leakage of developing agent, and a second seal member contacted with outer end face of the first seal member, wherein the second seal member is only provided downstream of a developing zone at which electrostatic latent images are developed, with respect to a rotational direction of said developing roller.
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