Samsung Electronics Co., Ltd.

Sang Bum Woo

Soo Yong Kim

Sung Dae Kim

Jae Il Yu

Hyun Ki Cho

Chang Yong Sung

Jong Tae Kim

An image forming apparatus and a method of reducing image banding of the image forming apparatus is provided. The image forming apparatus includes: a photoconductor unit on which an electrostatic latent image is formed; and a conveying unit configured to convey printing medium at a first conveying velocity toward the photoconductor unit, and configured to convey the printing medium at a second conveying velocity that is lower than the first conveying velocity when the printing medium approaches the photoconductor unit.

Image forming apparatus and method for reducing image banding of the image forming apparatus

A power transmitting device having a structure to allow a photoconductor to stably form a visible image on a printing medium. The power transmitting device interconnects a rotator and a drive motor, the drive motor generating drive power to drive the rotator. The power transmitting device includes at least one gear to be rotated upon receiving power from the drive motor, a rotating shaft having one end penetrating the gear and a coupler to interconnect the other end of the rotating shaft and the rotator. An outer diameter of the coupler, an outer diameter of the rotator and an outer diameter of the gear satisfy the following relation: 0.7D1&#x3c;Dc&#x3c;D2, where, D1: outer diameter of the rotator, D2: outer diameter of the gear and Dc: outer diameter of the coupler.

Power transmitting device and image forming apparatus having the same

Disclosed herein is an image forming apparatus that has a developing unit, an intermediate transfer body, and a transfer roller and may prevent contamination of the transfer roller and a printing medium by the toner remaining in a test pattern forming area of the intermediate transfer body. The image forming apparatus includes a developing unit to allow an image to be formed by a developing agent, an intermediate transfer body provided with an image forming area and a test pattern forming area, the image being transferred from the developing unit to the image forming area and the test pattern forming area, and a transfer roller allowing the image to be transferred from the image forming area to a printing medium, wherein a maximum transfer length of the transfer roller is less than a maximum image forming length of the developing unit.

Image forming apparatus having developing unit

An image forming apparatus, a color registration test pattern of the image forming apparatus, and a method of forming the color registration test pattern are provided. A time required for color registration may be reduced by minimizing a region in which a color registration test pattern is formed on an intermediate transfer body. A control method of the image forming apparatus, which includes photosensitive media arranged side by side to correspond to colors in a rotation direction of the intermediate transfer body, includes forming first patterns of the colors arranged in a single row in a sub-scanning direction in a first region of the intermediate transfer body over a single-rotation period of the photosensitive media, and forming second patterns of the colors arranged in a single row in the sub-scanning direction in a second region of the intermediate transfer body over another single-rotation period of the photosensitive media.

Image forming apparatus and method of controlling the same

An image forming apparatus and method which reduces time taken for color registration and reflects misregistration of colors in real time to correct color misregistration of prints are provided. Image forming apparatus may include photoconductor elements corresponding to colors; first sensing unit arranged between first and second photoconductor elements among photoconductor elements, and sensing toner images transferred to intermediate transfer body; final sensing unit arranged after final photoconductor element among photoconductor elements, and sensing transferred toner images; and controller calculating fixed errors of remaining colors except for first color among colors, with respect to first color corresponding to first photoconductor element, based on output values of final sensing unit before printing, calculating variable error based on output value of first sensing unit during printing, and adjusting scanning time of at least one color of remaining colors in real time in consideration of fixed errors and variable error.

Image forming apparatus and control method thereof

An image forming apparatus, which achieves reduced color registration time and real-time calibration of color position shift, and a control method for the same, is provided. The image forming apparatus includes plural photoconductors corresponding to plural colors, an exposure unit to form an electrostatic latent image by emitting light to the photoconductors, a developing unit to form a toner image by feeding toner to the photoconductors, an intermediate transfer body to which the toner image, formed on each photoconductor, is transferred, a sensing unit to sense the toner image formed on the intermediate transfer body, and a controller which forms images in respective image forming sections of the intermediate transfer body and test-pattern sets for color registration in respective blanks between the neighboring image forming sections, the controller implementing color registration calibration using color registration calibration values acquired from four test pattern sets among the formed test pattern sets.

Image forming apparatus and control method for the same

A multi pass type color image forming apparatus and control method are provided. The apparatus advances an exposure time point of forming electrostatic latent images of second and subsequent colors more than that of a first color of a page during consecutive printing or reduces the velocity of a motor to rotate an intermediate transfer belt to minimize a color registration error between a developing agent image of the first color and developing agent images of the subsequent colors of the page caused by cleaning of the intermediate transfer belt and a control method thereof.

Multi pass type color image forming apparatus and control method thereof

An image forming apparatus and a control method thereof which execute auto color registration in consideration of mechanical change factors of both photoconductors and drive rollers. The control method of an image forming apparatus includes photoconductors, an intermediate transfer belt to which developers attached to the photoconductors are transferred, and drive rollers to drive the intermediate transfer belt, test patterns are printed on the intermediate transfer belt by adjusting a printing time interval of the test patterns according to a spatial period of the photoconductors and a spatial period of the drive rollers, if conditions to execute auto color registration (ACR) are satisfied, and ACR is executed according to a signal reflected by the test patterns.

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Yongin-si, South Korea

Sang Bum Woo