Samsung Electronics Co., Ltd.

Samsung Display Co., Ltd.

Hyung-soo Kim

Bo-Yong Chung

Sang-Moo Choi

Wang-Jo Lee

Jae-hwan Yoo

Woo-Kyu Kim

Hyeong-chae Kim

A light scanning unit includes: a light source unit; a polygon mirror for deflecting and scanning light emitted from the light source unit, in a main scanning direction, and having a plurality of deflection surfaces and a plurality of edges at which adjacent deflection surfaces meet one another; an image forming optical system for condensing the deflected light; and a synchronization detection optical system for detecting a portion of light that is divided and reflected at an edge of the polygon mirror. The light scanning unit may be incorporated into an image forming apparatus.

Light scanning unit and image forming apparatus comprising the same

A light scanning unit and an electrophotographic image forming apparatus employing the same. The light scanning unit includes an imaging optical system including, when a path of one of the light beams directed to one of the surfaces disposed relatively far from the deflector is referred to as a first light path and when a path of one of the light beams directed to one of the surfaces disposed relatively close to the deflector is referred to as a second light path, light paths in which both of a section of the second light path before a first change of the second light path and a section of the second light path after the first change of the second light path intersect a section of the first light path after a second change of the first light path.

Light scanning unit and electrophotographic image forming apparatus using the same

A pixel circuit for an organic light emitting display is disclosed. The pixel uses both current and voltage driving methods. A voltage based on an input current and on an input voltage is stored, and current for an organic light emitting diode is generated based on the stored current.

Organic light emitting display comprising a sink current generator that generates an initialization current corresponding to bit values of initialization data

An organic light emitting display configured to be driven using a frame divided into a plurality of sub-frames includes a data driver configured to supply a plurality of data signals to output lines during a first period of one horizontal period of the sub-frame, a scan driver configured to sequentially supply a scan signal to scan lines during a second period of the one horizontal period of the sub-frame, a demultiplexer coupled to each output line, the demultiplexer being configured to supply the data signals to a plurality of data lines, buffers configured to supply buffers supplying signals from the demultiplexers to the data lines, the buffers including PMOS transistors, and pixels disposed at intersections of the scan lines and the data lines, the pixels being configured to display images corresponding to the data signals.

Organic light emitting display and driving method thereof

A light scanning unit includes: a light source generating and irradiating at least one beam corresponding to an image signal; a beam deflector deflecting and scanning the beam irradiated by the light source; and an f-&#x3b8; lens forming an image from the beam deflected by the beam deflector onto a surface to be scanned, the f-&#x3b8; lens being provided as one lens and satisfies the following equation (2): where SAGis Z value of an incident surface of the f-&#x3b8; lens, which faces the beam deflector, SAGis Z value of the exit surface of the f-&#x3b8; lens, which faces the surface to be scanned, based on an XYZ coordinate system in which a main scanning plane is a Y-Z plane and a sub-scanning plane is an X-Z plane, and dis a center thickness of the f-&#x3b8; lens.

Light scanning unit and image forming apparatus using the same

Provided are a light scanning unit and an electrophotographic image forming apparatus including the light scanning unit. The light scanning unit includes a light source, a polygonal mirror deflecting light emitted from the light source in a main scanning direction, an imaging lens transmitting the deflected light to a photoconductor for forming an image, and a synchronization detecting unit detecting a synchronization signal from the deflected light for synchronization in the main scanning direction. The light scanning unit has a total scanning rate, including a synchronization detecting optical path, ranging from about 60% to 75%.

Light scanning unit and electrophotographic image forming apparatus including the same

A laser scanning unit and an image forming apparatus having the same are provided. The laser scanning unit includes a plurality of light sources symmetrically disposed, and a rotatable deflector deflecting slantingly incident light beams symmetrically in a sub-scanning direction from the plurality of light sources. First and second f-&#x3b8; lenses focus the light beams reflected by the deflector on scanning lines on photosensitive drums and are disposed symmetrically with respect to a rotational axis of the deflector. Mirrors guide the light beams that have passed through the first and second f-&#x3b8; lenses toward the respective photosensitive drums. The mirrors are disposed asymmetrically with respect to the rotational axis of the deflector so that the scanning lines formed on the respective photosensitive drums may be deflected in the same direction.

Laser scanning unit and color laser printer having the same

A laser scanning unit and an image forming apparatus that include a deflector to deflect incident light; and a plurality of sub-scanning optical systems using the same reflective surface of the deflector. Each of the sub-scanning optical systems includes a light source, an entrance optical unit disposed between the light source and the deflector to direct light to the deflector, and an exit optical unit to direct the deflected light to imaging surfaces. Optical paths of the sub-scanning optical systems are asymmetric with reference to the deflector.

Laser scanning unit and image forming apparatus

A tandem laser scanning unit (LSU) is provided. The tandem LSU includes a light source, a beam deflector, and an optical scanning lens. The beam deflector rotates on a light-emitting path of the light source to simultaneously deflect different light beams obliquely incident at a predetermined angle to each other within a sub-scanning plane substantially parallel to the rotational axis of the beam deflector. The optical scanning lens allows the light beams deflected by the beam deflector to be condensed on corresponding photosensitive drums. The optical scanning lens includes at least one sub-scanning cross-section having an aspherical surface to reduce the curvature of a scanning line. Using the tandem LSU, the distortion and curvature of the scanning line are corrected while providing an oblique incidence optical system having advantages in terms of manufacturing costs and driving efficiency.

Tandem laser scanning unit includes an optical scanning lens includes at least one sub-scanning cross-section having an aspherical surface in a sub-scanning direction to reduce a curvature of the scanning line

An optical scanning unit including: a light source which produces and emits a beam; a beam deflector which deflects and scans the beam in a main scanning direction of an exposed object; and an f-&#x3b8; lens which corrects the beam deflected by the beam deflector at different magnifications for the main scanning direction than for a subscanning direction so that a corrected beam is focused onto the exposed object. When H is an entire length in the main scanning direction of the beam focused onto the exposed object and L is an axial distance between a reflection face of the beam deflector and the exposed object, the relationship of H and L satisfies an expression 

Optical scanning unit

A scanning optical lens used for a laser scanning unit for imaging a laser, which is deflected by a beam deflection unit, on a photosensitive body. The scanning optical lens has a curvature of a Meniscus shape at a sub-scanning direction section, wherein the Meniscus shape has the same curvature symbols at an incidence surface and an exit surface at a center of the lens. The incidence surface and the exit surface always have negative (&#x2212;) curvature symbols. An absolute curvature value of the incidence surface is maximal at the center, and has at least one minimal value at each of both sides in a main-scanning direction and wherein at least one of the minimal values is approximately zero.

Laser scanning unit with meniscus scan lens having asymmetric, negative curvature in the sub-scanning direction and absolute curvature values in the main-scanning direction that are maximal at the center and differing minimal values at each side

A beam scanning apparatus having a collimating lens in which a beam emitted from a light source is transformed into at least one of a convergent beam and a parallel beam with respect to an optical axis and outputted towards a slit. The collimating lens being one sheet of a spherical surface lens satisfying the relationship: in which, Rdenotes a curvature radius of a first surface of the collimating lens opposing the light source, Rdenotes a curvature radius of a second surface of the collimating lens opposing the slit, d denotes a center thickness of the collimating lens, and f denotes a focal length from the collimating lens to the light source. By virtue of the structure of the beam scanning apparatus using the collimating lens, deteriorating printing quality due to temperature change is prevented and cost can be saved.

Collimating lens of beam scanning apparatus

A temperature-compensated collimating lens provided of a single piece of lens, which does not have variation in its focal distance due to temperature changes, and an optical scanning apparatus using the same. The collimating lens to transform a ray of light from a light source into approximate parallel rays. The collimating lens is provided a single lens of plastic, and the single lens has a refraction surface provided on one side and a diffraction surface provided on the other side. The refraction surface and the diffraction surface have predetermined powers to prevent power of the collimating lens from changing due to change in temperature. The refraction surface and the diffraction surface have a power to satisfy the condition of, 

Collimating lens with temperature compensation and an optical scanning apparatus using the same

A multi-beam scanning apparatus has a lateral magnification M in a sub-scanning direction from a light source to a scanned surface satisfying 8.5&#x2266;M&#x2266;9.5, and a lateral magnification Min the sub-scanning direction from a light deflector to the scanned surface satisfying 0.5&#x2266;M&#x2266;2.0. The multi-beam scanning apparatus can use a light source having a relatively low power.

Growing community of inventors

Suwon-si, South Korea

Hyung-soo Kim