Color registration by varying rotational speed of photosensitive drum
AssigneeHewlett-Packard Development Company, L.P.
InventorsYasuhisa Ehara, Jaeil Yu, Sangbum Woo, Sungdae Kim, Sooyong Kim, Youngwan Cho
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Abstract
An example image forming apparatus includes a printing engine including a plurality of photosensitive drums, a motor device to provide a driving force to each of the plurality of photosensitive drums, and a processor to control the printing engine such that printing data is printed on a printing paper and control the motor device such that at least one of the plurality of photosensitive drums operates at a different speed from the other photosensitive drums while the printing data is printed.
Claims20
An image forming apparatus comprising:
- a printing engine including a plurality of photosensitive drums;
- a motor device to provide a driving force to each of the plurality of photosensitive drums;
- and
- a processor to:
- control the printing engine such that printing data is printed on a printing paper,
- control the motor device such that at least one of the plurality of photosensitive drums operates at a different speed from the other photosensitive drums while the printing data is printed, and
- control the motor device, based on a transcription position of the at least one photosensitive drum being prior to a predetermined reference position, such that the at least one photosensitive drum operates slower than a reference speed of the at least one photosensitive drum or control the motor device, based on the transcription position being behind the predetermined reference position, such that the at least one photosensitive drum operates faster than the reference speed.
A method of color registration in an image forming apparatus, the method of color registration comprising:
- receiving printing data;
- printing the received printing data by using a plurality of photosensitive drums;
- controlling a motor device to provide a driving force to each of the plurality of photosensitive drums such that at least one of the plurality of photosensitive drums operates at a different speed from the other photosensitive drums while the printing data is printed;
- and
- based on a transcription position of the at least one photosensitive drum being prior to a predetermined reference position, driving the at least one photosensitive drum slower than a reference speed of the at least one photosensitive drum or, based on the transcription position being behind the predetermined reference position, driving the at least one photosensitive drum faster than the reference speed.
An image forming apparatus comprising:
- a printing engine including a plurality of photosensitive drums;
- a memory to store position offset information for each color,
- a motor device to provide a driving force to each of the plurality of photosensitive drums;
- and
- a processor to:
- control the printing engine such that printing data is printed on a printing paper,
- control the motor device such that at least one of the plurality of photosensitive drums operates at a different speed from the other photosensitive drums while the printing data is printed,
- adjust, based on the offset information, a time point of exposure for the at least one photosensitive drum with respect to an offset difference equal to or greater than a predetermined size and compensate an offset, and
- control a driving speed for the at least one photosensitive drum with respect to an offset difference smaller than the predetermined size and compensate an offset for the at least one photosensitive drum.
Dependencies are inferred from the claim text.