Samsung Electronics Co., Ltd.

Won-hyung Lee

Jae-yong Eum

Young-Il Kim

Jin-seung Choi

Jee-hong Min

Hwan-young Choi

Moon-gyu Lee

Sung-min Cho

Jong-Woo Kim

Yong-baek Yoo

Kyu-cheol Shin

Kwang-ho No

Woo-yong Park

Chung-guk Baek

Seung-deog An

Wan-ha Kim

Yoon-Seop Eom

Cheol-Young Han

Hyung-jin Ahn

Gary H Conners

An electrophotographic printing apparatus having a structure so that differences between surface energies of components of the electrophotographic printing apparatus contributing to image transfer are maintained within predetermined ranges, and an image transferring method thereof. The electrophotographic printing apparatus includes a photosensitive medium, developing units, a drying roller and a transfer unit having a transfer roller, whereby the peeling force (PF ) of the drying roller is in a range of 0 gram force per inch (gf/inch)&lE;PF &lE;300 gram force per inch (gf/inch), the peeling force (PF ) of the photosensitive medium is in a range of 0 gram force per inch (gf/inch)&lE;PF &lE;80 gram force per inch (gf/inch), and the peeling force (PF ) of the transfer roller is in a range of 200 gram force per inch (gf/inch)&lE;PF &lE;500 gram force per inch (gf/inch), respectively, when the peeling forces are measured. The image transferring method for an electrophotographic printing apparatus includes the steps of adjusting the peeling force (PF ) of the drying roller, the peeling force (PF ) of the photosensitive medium, and the peeling force (PF ) of the transfer roller to be within the above mentioned respective ranges.

Electrophotographic printing apparatus and image transferring method for an electrophotographic printing apparatus

A photoreceptor web for an image forming apparatus includes a base layer, a conductive ground layer formed on the base layer, and a photosensitive layer formed on the ground layer, where an electrostatic latent image is formed by scanned light. A first protective layer is formed on the photosensitive layer for protecting the photosensitive layer, and a heating layer is formed on a rear surface of the base layer in a predetermined pattern for receiving electric power and generating resistance heat. The photoreceptor web is maintained at a constant temperature by the resistance heat generated by the heating layer.

Image forming method and apparatus having a photoreceptor web

A beam scanning system including: a light source; a deflection disc rotatably installed over the light sources and having a hologram pattern on each of the upper and lower surfaces thereof, for diffracting beams emitted from the light source; and a plurality of mirrors for reflecting beams that have been diffracted by the deflection disc, to change the diffracted paths of the beams. Each of the upper and lower hologram patterns is formed with a low density relative to a one-sided hologram pattern.

Beam scanning system adopting deflection disc

An apparatus and a method of removing a photoreceptor belt from an electrophotographic printer are provided. The apparatus includes at least one pair of rollers for pressing and transferring the photoreceptor belt circulating in a predetermined traveling track, a cutting blade capable of cutting the photoreceptor belt while moving across the photoreceptor belt, a cylindrical member rotatably installed in a filter housing disposed near the photoreceptor belt, the filter housing having a filter cartridge for filtering foreign material of the inner air of the printer, and a driver for rotating the cylindrical member such that the photoreceptor belt is wound around the cylindrical member. The photoreceptor belt is cut and automatically drawn from the traveling track into the filter housing. The cut photoreceptor belt is removed together with the filter cartridge installed in the filter housing. The photoreceptor belt removing process can be easily and quickly performed, and it is also convenient to manage a replacement cycle of supplies for a printer.

Apparatus and method of removing photoreceptor belt for electrophotographic printer

A diffractive deflection beam scanning system including: a plurality of light sources; a deflection disc rotatably mounted over the light sources, having patterns capable of diffracting and deflecting beams emitted from the light sources; a plurality of first reflecting mirrors for changing the traveling paths of beams diffracted and deflected by the deflection disc; a plurality of second reflecting mirrors for reflecting the beams reflected by the first reflecting mirrors in a beam scan direction, wherein the light sources are disposed in a straight line along a bisecting line of the deflection disc, perpendicular to the beam scan direction, and the second reflecting mirrors are arranged over the center of the deflection disc at different heights.

Diffractive deflection beam scanning system

A multi-laser scanning unit (LSU) in which scanning lines incident parallel onto a photoreceptor have the same scanning direction. The multi-laser scanning unit includes: a driving source for providing a rotatory force; a deflection disk installed around a rotary shaft of the driving source having a plurality of sectors each with a hologram pattern for diffracting and deflecting incident light, for scanning light through rotation; a plurality of light sources installed facing one surface of the deflection disk for irradiating a plurality of light lines onto predetermined points of the deflection disk; and a light path changing portion for changing traveling paths of the plurality of scanning lines formed by the rotation of the deflection disk, wherein the plurality of light sources are arranged such that two incident points which are the farthest from each other among the plurality of incident points formed on the deflection disk form 180&deg; with the center point of the deflection disk.

Multi-laser scanning unit

A developer contamination measuring apparatus of a printer includes a first pipe portion having a first gap and a second pipe portion having a second gap, a light emitting unit radiating light to the first pipe portion and the second pipe portion, a light detecting unit detecting light reflected or transmitted from the first pipe portion and the second pipe portion to output first and second light receiving signals, respectively, and a developer contamination measuring unit controlling the light emitting unit, and calculating the degree of a contamination due to mixing of other developing materials with the developer from the first and the second light receiving signals. Thus, the degree of contamination of a developer mixed with other developing materials can be precisely calculated, and the developer can be replaced, when the calculated amount of contamination exceeds a predetermined allowable contamination level, to thereby prevent deterioration of print quality.

Apparatus and method for measuring developer contamination of printer

An ink supply apparatus for a wet electrophotographic printer. The ink supply apparatus includes a housing having an installation portion, an ink cartridge installed in the housing, for supplying ink to a developing unit, a detachable refill cartridge loaded in the installation portion, for supplying ink to the ink cartridge, and an ink supply device for supplying ink to the ink cartridge from the refill cartridge.

Ink supply apparatus for wet electrophotographic printer

A multi-beam scanning apparatus includes at least two optical sources, a beam deflector having a deflection disc with a plurality of sectors for diffracting and transmitting incident beams, and a driving source for rotating the deflection disc, for deflecting and projecting beams emitted from the optical sources. A beam corrector installed along a light path, for correcting the beams deflected by the beam deflector.

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Seoul, South Korea

Won-hyung Lee