Abstract: A method of controlling performance of auto color registration (ACR) of a color image forming apparatus, and an image forming apparatus using the same are provided. The method of controlling performance of ACR includes forming a composite black image on a transfer belt, sensing the composite black image by using a sensor, measuring the sensed composite black image, and performing ACR correction when a measured width of the composite black image is greater than a previously set value. Accordingly, it is possible to prevent unnecessary performance of ACR control when no color misregistration has occurred. In this way, ACR control is performed in as short a time as possible so that performance of the image forming apparatus may be improved. Also, it is possible to prevent waste of ACR performance time and life span reduction of a driving source for ACR.

Abstract: A method of controlling performance of auto color registration (ACR) of a color image forming apparatus, and an image forming apparatus using the same are provided. The method of controlling performance of ACR includes forming a composite black image on a transfer belt, sensing the composite black image by using a sensor, measuring the sensed composite black image, and performing ACR correction when a measured width of the composite black image is greater than a previously set value. Accordingly, it is possible to prevent unnecessary performance of ACR control when no color misregistration has occurred. In this way, ACR control is performed in as short a time as possible so that performance of the image forming apparatus may be improved. Also, it is possible to prevent waste of ACR performance time and life span reduction of a driving source for ACR.

Abstract: An image forming device having a plurality of developing units is provided. The image forming device includes a control unit to determine whether to perform an auto color registration (ACR) with respect to one or more of the plurality of developing units, and a print engine unit to perform an ACR of the determined developing units.

Abstract: A method of compensating for printing quality of an image forming apparatus includes determining a pattern to be printed as a first pattern which is a default pattern and a second pattern obtained by changing the first pattern according to a toner stress index that represents a deteriorated degree of remaining toner, and printing the determined pattern with the remaining toner.

Abstract: An image forming device capable of controlling an auto color registration (ACR) and a method of controlling an ACR. In the image forming device, a sensor detects preliminary test patterns by colors on a conveying belt; a color registration correction unit determines a present alignment state of the respective colors using data detected using colors by the sensor, and judges whether to perform a correction work of relative registration positions of the respective colors on the basis of the result of the determination; and a control unit forms actual test patterns on the conveying belt if it is judged that the correction work should be performed, and controls the sensor and the color registration correction unit to re-detect the data using colors and to perform the correction work.

Abstract: A method of compensating for printing quality of an image forming apparatus includes determining a pattern to be printed as a first pattern which is a default pattern and a second pattern obtained by changing the first pattern according to a toner stress index that represents a deteriorated degree of remaining toner, and printing the determined pattern with the remaining toner.

Abstract: A color registration method of an image forming apparatus, including forming a plurality of front detection marks corresponding to a plurality of colors on a transfer belt, forming a first rear detection mark to at least one of the plurality of colors, except at least one of the plurality of colors, using a color registration reference, and performing auto color registration (ACR) to align the colors on the basis of the first rear detection mark.

Abstract: A color registration method of an image forming apparatus, including forming a plurality of front detection marks corresponding to a plurality of colors on a transfer belt, forming a first rear detection mark to at least one of the plurality of colors, except at least one of the plurality of colors, using a color registration reference, and performing auto color registration (ACR) to align the colors on the basis of the first rear detection mark.

Abstract: An image forming device having a plurality of developing units is provided. The image forming device includes a control unit to determine whether to perform an auto color registration (ACR) with respect to one or more of the plurality of developing units, and a print engine unit to perform an ACR of the determined developing units.

Abstract: An image forming device capable of controlling an auto color registration (ACR) and a method of controlling an ACR. In the image forming device, a sensor detects preliminary test patterns by colors on a conveying belt; a color registration correction unit determines a present alignment state of the respective colors using data detected using colors by the sensor, and judges whether to perform a correction work of relative registration positions of the respective colors on the basis of the result of the determination; and a control unit forms actual test patterns on the conveying belt if it is judged that the correction work should be performed, and controls the sensor and the color registration correction unit to re-detect the data using colors and to perform the correction work.