| 摘要 |
An image forming apparatus including: a first charging device for charging an imageable surface; recording means for recording an electrostatic latent image on the imageable surface; developing means for developing the electrostatic latent image with developer; a second charging device for transferring a developer image on the imageable surface onto an a substrate; control means for setting a value of the bias of either the first charging device or the second charging device from an operating bias to a testing bias; test pattern forming means for forming test patterns on the imageable surface at operating bias and said testing bias; test patterns detection means for scanning non-uniformity of the test patterns, and means for associating non-uniformity of the test patterns to a reliability condition of either the first charging device and/or second charging device.
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