| 摘要 |
An image-forming device includes an image bearing member, a data providing unit, an image-forming unit, a detecting unit, a first calculating unit, a determining unit, and a second calculating unit. The image bearing member has a surface moving at a surface speed. The data providing unit provides pattern data indicative of a target test pattern to be formed on a target position of the surface in response to a test instruction. The image-forming unit forms an actual test pattern on an actual position of the surface in accordance with the pattern data provided from the data providing unit, and configure to form an image in response to an image-forming instruction. The detecting unit detects the actual position. The first calculating unit calculates a deviation of the actual position from the target position. The determining unit performs a first determination of whether the surface speed when the data providing unit receives the test instruction is stable or unstable. The second calculating unit calculates a correction amount based on the deviation and the first determination. The image-forming unit forms, in response to the image-forming instruction, an image on a position of the surface. The position is corrected based on the correction amount.
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