Samsung Electronics Co., Ltd.

Hp Printing Korea Co., Ltd.

Young-jung Yun

Ji-young Byun

Seong-ho Shin

Jin-ho Park

Sung-dae Kim

Karp-sik Youn

Young-bok Ju

Hyoung-il Kim

Yong-Ho You

Jong-Ho Ha

Ho-bin Hwang

Ho-Bin Hwang

Yae-young Kim

Gwon-hoon Kim

A scanner apparatus includes a document feeding path in which a reading device configured to read an image from a document is provided, a first registration roller configured to feed the document along the document feeding path, and located at an upstream side of the reading device based on a feeding direction of the document, a second registration roller aligned with the first registration roller in a width direction of the document, and located spaced apart from the first registration roller in the width direction, a registration motor configured to drive the first registration roller, and a main motor configured to drive the second registration roller.

Scanner apparatus, image forming apparatus employing the same, and skew correction method

An image forming apparatus includes an engine unit used for performing an image forming job, an engine control unit which controls the operation of the engine unit, a brushless direct current (BLDC) motor which drives the engine unit, a sensor unit which senses the driving information of the BLDC motor, a communication interface unit which receives a digital control command with respect to the BLDC motor from the engine control unit, a driving signal unit which generates a driving signal to control the BLDC motor, and a digital control unit which controls the operation of the driving signal unit in a digital PLL manner, based on the received digital control command, the detected driving information and a digital gain value as a control factor with respect to the BLDC motor.

Image forming apparatus, motor control apparatus and motor control method thereof

An image forming apparatus includes an engine unit to perform an image forming job, an engine control unit to control operation of the engine unit, a plurality of brushless direct current (BLDC) motors to operate the engine unit, a communication interface unit to receive a digital control command for the plurality of brushless DC motors from the engine control unit, a sensor unit to sense operation information of the plurality of brushless DC motors, an operation signal unit to generate an operation signal to control the plurality of brushless DC motors, and a speed control unit to control operation of the operation signal unit according to the received digital control command and sensing result of the sensor unit.

Image forming apparatus, motor control apparatus, and motor control method

A two-side scanning apparatus and a method of controlling the two-side scanning apparatus including a sheet feeding roller train installed on a first side of a white roller to transfer a sheet to the white roller and including two rollers contacting each other, a sheet discharging roller train installed on a second side of the white roller opposite the sheet feeding roller train, a sheet reversing path surrounding a circumferential surface of the white roller to receive and guide the sheet being transferred from the sheet discharging roller train back between the white roller and an image sensor, and a sheet guide plate installed between the white roller and the sheet discharging roller train to pivot at a predetermined angle and to guide the sheet toward the sheet reversing path when the sheet is transferred from the sheet discharging roller train toward the white roller.

Two-side scanning apparatus and a method of controlling the same

An image forming apparatus, includes an image forming unit, a driver having a driving unit as a driving source of the image forming unit, a detector which detects driving information of the driving unit, and a controller which controls the driver to operate with a delay time corresponding to a difference between the detected driving information and a reference value.

Image forming apparatus and control method thereof

A media detection apparatus and method usable with an image forming apparatus includes a light source to irradiate light to surfaces of recording media, a light receiving part to receive light reflected from the recording media an angle changing unit to change an angle of at least one of the light source and the light receiving part with respect to the recording media, and a controller to determine a type of recording media through signals measured from the light receiving part depending on the angle changed by the angle changing unit. The media detection apparatus is capable of effectively detecting the type of recording media by changing an irradiation angle and reflection angle of light.

Media detection apparatus and method usable with image forming apparatus

An array type inkjet printer and a method of determining the condition of nozzles in the array type inkjet printer are disclosed. The array type inkjet printer includes a plurality of head chips, each comprising a plurality of nozzles, a print part which prints a plurality of test patterns of different forms, a scanning part which scans the plurality of printed test patterns, and a controller which controls the print part to print the plurality of test patterns using nozzles of interest among the plurality of nozzles, and determines the condition of the nozzles of interest with reference to a certain part of an image of the scanned test patterns. Accordingly, nozzle information is easily determined.

Array type inkjet printer and method for determining condition of nozzles thereof

An image-forming apparatus and print media recognition method therefor, wherein the apparatus comprises a first light-emitting element for emitting light to a print medium at a predetermined first incident angle, a second light-emitting element for emitting light to the print medium at a predetermined second incident angle, and a light-receiving element installed along an optical axis of total reflection light emitted from the first light-emitting element and reflected from a surface of the print medium. The apparatus further comprises a control unit for controlling the first and second light-emitting elements to alternately emit light for deciding a print medium material based on a reflection amount of light received by the light-receiving element and establishing print conditions adapted to the print media.

Image-forming apparatus and print media recognition method therefor

An image forming apparatus and a method thereof for preventing degradation of image quality by a malfunctioning nozzle are disclosed. The image forming apparatus includes a print head including a first nozzle line having a plurality of nozzles arranged with a predetermined pitch I and a second nozzle line disposed at predetermined distance D from the first nozzle line and having a plurality of nozzles arranged to be deviated from the nozzles of the first nozzle line with a predetermined pitch I. A controller controls the print head to inject ink to form at least a portion of dots to be overlapped by ink injected from the nozzles of the first nozzle line.

Image forming apparatus and method thereof

A method of correcting the speed of an encoder and an apparatus therefor are provided. The method includes the steps of detecting an electrical signal corresponding to a driving speed of a motor, calculating driving speed values of the motor in sections of the electrical signal, respectively, storing the calculated speed values in the order of calculation, selecting an intermediate speed value among the speed values calculated from the three or more continuous sections, and correcting the driving speed of the motor in accordance with the selected intermediate speed value.

Method of correcting speed of encoder and apparatus therefor

A method and apparatus for adjusting the alignment of an image forming device using two thermal heads, wherein the method includes the steps of (a) printing first and second predetermined patterns on the medium by using the first and second thermal heads, respectively, (b) detecting a distance difference of print positions between the first and second thermal heads by using the printed patterns, and (c), based on the detected distance difference, transforming image data printed by the thermal heads to adjust the alignment in subpixel units. Therefore, a distance difference of printing positions of the thermal heads can be compensated by detecting the distance difference between the printing positions of the thermal heads, and moving the target image data by the detected distance difference. As a result, the alignment of the thermal heads can be easily and accurately adjusted.

Method and apparatus for adjusting alignment of image forming device

A method for correcting scanning errors in a shuttle type of a scanner, including the steps of scanning a pattern sheet on which pattern data having a specified shape are recorded. Errors for decline of the pattern data are corrected by using the pattern data having a straight line among the scanned pattern data having the specified shape. Then, errors for distance between bands are corrected by using the pattern data having the specified shape among the pattern data of which the errors for decline are corrected. Accordingly, since the errors for decline and the errors for distance between the bands can be corrected by using a computing program, there is an advantage in that correcting the errors of the pattern data is very simple. A further advantage is in that even if the scanner is subjected to an impact from its exterior, correcting the errors for decline and the errors for distance between the bands can be promptly performed.

Growing community of inventors

Suwon-si, South Korea

Young-jung Yun