| 摘要 |
An image forming method causes each of a plurality of image stations to form a test patch image on a respective image carrier and senses the density of the test patch image for executing image quality compensation control. The test patch image is formed after image formation using an upstream one of two developing portions in a direction of rotation of the image carrier or before image formation using a downstream one of the developing portions. This method promotes high-speed operation, miniaturization and low-cost configuration of an image forming apparatus.
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