Abstract: Disclosed are a wide angle lens and an imaging device including the same. The wide angle lens includes a first lens having a negative refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a positive refractive power, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are sequentially disposed from an object side to an image plane side. The wide angle lens satisfies a conditional expression of (FOV/2)*(?/180)/IH>EFL. Here, FOV denotes an angle of view of the wide angle lens, IH denotes an image height of the wide angle lens, and EFL denotes an effective focal length of the wide angle lens.

Abstract: A laser scanning unit and a color image forming apparatus using the laser scanning unit. The laser scanning unit includes a deflector that is rotatable to deflect a plurality of light beams that are incident on the deflector from a plurality of light sources at an angle with respect to a sub-scanning direction; at least one optical path changing member to change an optical path of each of the light beams deflected by the deflector; and a first f-? lens to focus the light beam that passes through the optical path changing member onto a corresponding scanning target surface.

Abstract: A light scanning unit and an electro-photographic image forming apparatus employing the same are provided.

Abstract: A light scanning unit includes: a light source emitting a light beam according to an image signal; a light deflector deflecting and scanning the light beam emitted from the light source; and a synchronization detection optical system comprising a synchronization detection sensor detecting a synchronization signal by receiving a portion of the light beam that is deflected and scanned by the light deflector and a synchronization detection lens disposed between the light deflector and the synchronization detection sensor, wherein the synchronization detection lens is an anamorphic lens in which refractive power in a first direction and refractive power in a second direction different from the first direction are different, and wherein the first direction of the synchronization detection lens is inclined with respect to a main scanning direction in which a light beam incident on the synchronization detection lens is scanned.

Abstract: A light scanning unit and an electro-photographic image forming apparatus employing the same are provided.

Abstract: A light scanning unit includes: a light source emitting a light beam according to an image signal; a light deflector deflecting and scanning the light beam emitted from the light source; and a synchronization detection optical system comprising a synchronization detection sensor detecting a synchronization signal by receiving a portion of the light beam that is deflected and scanned by the light deflector and a synchronization detection lens disposed between the light deflector and the synchronization detection sensor, wherein the synchronization detection lens is an anamorphic lens in which refractive power in a first direction and refractive power in a second direction different from the first direction are different, and wherein the first direction of the synchronization detection lens is inclined with respect to a main scanning direction in which a light beam incident on the synchronization detection lens is scanned.

Abstract: A light scanning unit includes a light source unit to emit a plurality of light beams, a light deflector to deflect the plurality of light beams emitted from the light source unit in a sub-scanning direction, an incident optical system to allow the plurality of light beams emitted from the light source unit to be incident on different reflection surfaces of the light deflector, and an imaging optical system that allows a plurality of light beams that are deflected by the light deflector, to be imaged on different scanning surfaces, wherein the incident optical system includes at least one incident light path changing member that folds light paths of the plurality of light beams between the light source unit and the light deflector.

Abstract: A laser scanning unit and a color image forming apparatus using the laser scanning unit. The laser scanning unit includes a deflector that is rotatable to deflect a plurality of light beams that are incident on the deflector from a plurality of light sources at an angle with respect to a sub-scanning direction; at least one optical path changing member to change an optical path of each of the light beams deflected by the deflector; and a first f-? lens to focus the light beam that passes through the optical path changing member onto a corresponding scanning target surface.

Abstract: Provided are a light scanning unit and an image forming apparatus including the light scanning unit. The light scanning unit can include a source, a deflector, and an optical imaging system. The deflector can deflect the light generated by the source. The optical imaging system can form the deflected light into an image on a photosensitive medium and can have a first and second optical imaging lenses collectively configured: to have the functionality of an f-theta lens. The optical imaging system can be such that a first ratio (k/fm) is between about 0.81 and about 0.88, and a second ratio (fm/fm1) is between about 0.6 and about 0.91, where k is an f-theta scanning coefficient of the optical imaging system, fm is a main scanning focal distance of the optical imaging system, and fm1 is a main scanning focal distance of the first optical imaging lens.

Abstract: A light scanning unit includes a light source unit to emit a plurality of light beams, a light deflector to deflect the plurality of light beams emitted from the light source unit in a sub-scanning direction, an incident optical system to allow the plurality of light beams emitted from the light source unit to be incident on different reflection surfaces of the light deflector, and an imaging optical system that allows a plurality of light beams that are deflected by the light deflector, to be imaged on different scanning surfaces, wherein the incident optical system includes at least one incident light path changing member that folds light paths of the plurality of light beams between the light source unit and the light deflector.

Abstract: A light scanning system and an image forming apparatus including the same, the light scanning system including: one or more light sources to emit light; a deflector to deflect the emitted light; and one or more f-? lenses to focus the deflected light onto a photosensitive medium, wherein the light emitted by the one or more light sources is obliquely incident on a plane perpendicular to a rotational axis of the deflector, and the f-? lens satisfies ?0.5<R1/R2<0.2, where R1 is a curvature radius of an entrance surface of the respective f-? lens in a main-scanning direction and R2 is a curvature radius of an exit surface of the respective f-? lens in the main-scanning direction.

Abstract: Provided are a light scanning unit and an image forming apparatus including the light scanning unit. The light scanning unit can include a source, a deflector, and an optical imaging system. The deflector can deflect the light generated by the source. The optical imaging system can form the deflected light into an image on a photosensitive medium and can have a first and second optical imaging lenses collectively configured: to have the functionality of an f-theta lens. The optical imaging system can be such that a first ratio (k/fm) is between about 0.81 and about 0.88, and a second ratio (fm/fm1) is between about 0.6 and about 0.91, where k is an f-theta scanning coefficient of the optical imaging system, fm is a main scanning focal distance of the optical imaging system, and fm1 is a main scanning focal distance of the first optical imaging lens.

Abstract: A light scanning system and an image forming apparatus including the same, the light scanning system including: one or more light sources to emit light; a deflector to deflect the emitted light; and one or more f-? lenses to focus the deflected light onto a photosensitive medium, wherein the light emitted by the one or more light sources is obliquely incident on a plane perpendicular to a rotational axis of the deflector, and the f-? lens satisfies ?0.5<R1/R2<0.2, where R1 is a curvature radius of an entrance surface of the respective f-? lens in a main-scanning direction and R2 is a curvature radius of an exit surface of the respective f-? lens in the main-scanning direction.

Abstract: A light scanning unit to scan light beams to a plurality of photoconductive bodies. The light scanning unit includes: a light source to emit a plurality of beams; a beam-deflecting unit to form scanning beams from the beams emitted by the light source; a plurality of reflecting mirrors to reflect the scanning beams; and an optical imaging system to focus the reflected scanning beams onto each of the photoconductive bodies. The scanning beams can be reflected by the reflecting mirrors at a first angle that is between about 60° and about 90° or at a second angle that is supplementary to the first angle.

Abstract: A two-dimensional surface emitting laser array having two sub-scanning pitches is provided. A multi-beam scanning unit employs the two-dimensional surface emitting laser array, and an image forming apparatus employs the multi-beam scanning unit. The two-dimensional surface emitting laser array includes n x m surface emitting lasers including n surface emitting lasers arranged with substantially equal spacing a on base lines N, and m surface emitting lasers arranged with substantially equal spacing b on n inclined lines M that are inclined at an angle ? with respect to the base lines N and pass through the respective n surface emitting lasers.

Abstract: A light scanning unit includes a light source, a collimating unit for collimating light emitted from the light source, and a rotatory polygonal mirror for deflecting light radiated from the collimating unit. One sheet of an f-theta lens scans the light deflected by the rotatory polygonal mirror to a plane at a substantially uniform velocity to form an image on the plane and to correct a field curvature aberration in a main scanning direction. The f-theta lens may be a meniscus lens having a convex surface directed toward a deflection plane. A curvature of the f-theta lens in the main scanning direction differs from a curvature in a sub scanning direction. The f-theta lens has an aspherical shape in which a curvature in the sub scanning direction is varied continuously. A ratio of the radius of curvature of a first surface to the radius of curvature of a second surface at an optical axis is approximately at least 1.7.