摘要:
An optical scanning apparatus that includes a light source, a polygon mirror for deflecting a plurality of light beams emitted from the light source, and an image focusing system for causing the light beams deflected by the polygon mirror to form spots on surfaces of a plurality of photosensitive drums, wherein the image focusing system is disposed between the polygon mirror and the photosensitive drums, and includes scanning lenses for causing the beams deflected by the polygon mirror to form spots on the respective surfaces of the photosensitive drums, and the central axes of the scanning lenses are spaced a predetermined distance from optical axes extended from the center of the light source.
摘要:
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.
摘要:
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.
摘要:
An electroluminescent display device including pixels each adapted to receive respective first and second scan signals via respective first and second lines, a scan driver adapted to supply a respective scan signal to each of the scan lines and to supply a respective light emitting control signal to each of the light emitting control lines, and a data driver adapted to primarily charge the pixel by sinking a predetermined electric current through a respective electric current sink line when the first scan signal is supplied to the first scan line, and to secondarily charge the respective pixel by supplying a voltage data signal to a respective one of the data lines when the second scan signal is supplied to the second scan line associated with the pixel.
摘要:
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%.
摘要:
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.
摘要:
A laser scanning unit includes a first optical system having a plurality of beam sources. A first optical deflector respectively deflects beams emitted from the beam sources in different directions. A plurality of scanning lenses correct errors of the beams deflected from the first optical deflector. A plurality of reflection mirrors respectively reflect the beams passing through the scanning lenses to a plurality of surfaces to be scanned. A second optical system has a plurality of beam sources. A second optical deflector respectively deflects beams emitted from the beam sources of the second optical system in different directions. A plurality of scanning lenses correct errors of the beams deflected from the second optical deflector. A plurality of reflection mirrors respectively reflect the beams passing through the scanning lenses to a plurality of surfaces to be scanned. At least the first and the second optical deflectors of the first and the second optical systems are respectively arranged on planes different from each other.
摘要:
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 (−) 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.
摘要:
A laser scanning unit is provided comprising a polygon mirror that deflects light beams respectively emitted by a plurality of light sources, an image focusing system that respectively focuses an image corresponding to each light beam deflected from the polygon mirror onto a surface of a plurality of photoconductive drums, and an incident optical system disposed between the light sources and the polygon mirror. The incident optical system comprises an infinite optical system along a main scanning direction and a finite optical system along a sub-scanning direction.
摘要:
An optical scanning apparatus including a light source, a light deflector having a plurality of deflection surfaces to deflect a light beam emitted from the light source, and an image forming optical system to form an image on a target surface with a light beam deflected by the light deflector and reflect the light beam emitted from the light source using a deflection surface of the light deflector to scan the target surface. The optical scanning apparatus includes a mirror member, which has different refractivities in a main scan direction and a sub scan direction so that the mirror member reflects the light beam emitted from the light source to form a long linear image on the deflection surface in the main scan direction.