Abstract: An image forming apparatus having a light scanning unit including a light source to emit a light beam; a deflector to deflect the light beam in a main scanning direction; an imaging lens to focus the light beam deflected by the deflector onto a photoconductor; at least one reflecting element to reflect the light beam that has passed through the imaging lens; and a bow control apparatus to correct a bow of a scanning line of the light beam, the bow control apparatus comprising first and second support units to support the reflecting element, first and second pressure units to pressure an inside and an outside of the reflecting element, respectively, and first and second adjusting elements to adjust the amount of pressure of the first and second pressure units, the bow control apparatus convexly or concavely bows the reflecting element to correctan image bow of a scanning line of the light beam.

Abstract: An f-? lens is joined to a mount through a light curable bond, forms an incident deflected beam onto a photosensitive body, and includes a lens part which has an incident side on which the deflected beam is incident, and an exiting side which is disposed near the photosensitive body and on which the entered deflected beam is exited, an joining part which has a joining side which is extended from the incident face and is joined to the mount, and an emitting side which is extended from the exiting face and disposed to face the joining side, and which a light beam for curing the light curable bond is scanned, and an emitting part which is formed on the emitting side in a non-planar shape and provided to decrease loss of light quantity of the light beam scanned on the emitting face, so that the f-? lens provides an improved joining force in a joining process by a light cure joining type.

Abstract: An image forming apparatus including a photosensitive member on which an electrostatic latent image is formed, a light scanning unit to scan a light beam onto the photosensitive member so as to form an electrostatic latent image, a developing unit to apply developer onto the photosensitive member formed with the electrostatic latent image, so as to form a visible image, and a transfer unit to transfer the visible image, formed on the photosensitive member, onto a printing surface.

Abstract: An f-? lens is joined to a mount through a light curable bond, forms an incident deflected beam onto a photosensitive body, and includes a lens part which has an incident side on which the deflected beam is incident, and an exiting side which is disposed near the photosensitive body and on which the entered deflected beam is exited, an joining part which has a joining side which is extended from the incident face and is joined to the mount, and an emitting side which is extended from the exiting face and disposed to face the joining side, and which a light beam for curing the light curable bond is scanned, and an emitting part which is formed on the emitting side in a non-planar shape and provided to decrease loss of light quantity of the light beam scanned on the emitting face, so that the f-? lens provides an improved joining force in a joining process by a light cure joining type.

Abstract: A beam detector includes a beam detection sensor to receive a light beam emitted from a light source of a light scanning unit and to generate a synchronous signal, a slit member having a slit formed therein to control a time to generate the synchronous signal of the beam detection sensor by adjusting an amount of the light beam received by the beam detection sensor, and a holder in which the slit member is installed. The slit is extended in a vertical direction and, a pair of surfaces form the slit and face each other, one of the pair of surfaces at which a scanned light beam arrives first is inclined in the vertical direction.

Abstract: A laser scanning unit includes a light source for emitting a plurality of laser beams, a rotating polygon mirror for deflecting the plurality of laser beams in a predetermined direction, an f? lens for transmitting the deflected laser beams to be scanned onto the surfaces of a plurality of photosensitive drums, and a beam splitter disposed at a rear end of the f? lens for splitting the laser beams. The laser scanning unit may be used for a tandem image forming apparatus.

Abstract: A multi-beam laser scanning unit including a laser diode unit for discharging a plurality of laser beams, a rotational member for supporting the diode unit and rotating to a substantially aligned position between a plurality of the laser beams, a fixing member for supporting the rotational member in a rotatable manner, a temporary joining part for maintaining joining status between the rotational member and the fixing member in such a way that the rotational member easily rotates until position alignment between a plurality of the laser beams is achieved, and a fixing part for fixing the rotated rotational member to the fixing member.

Abstract: A laser beam isolation includes a blocking unit having an at least partially metallic shutter disposed in a laser scanning unit to be movable between a first position to open a path of a laser beam and a second position to block the path of the laser beam. A magnetic unit is disposed opposite to the shutter at least one of a cover and an image forming unit of the device to actuate the shutter to move to the first position when the cover is closed, or when the image forming unit is mounted in the device. During an opening of the cover or a removal of the image forming unit, the blocking portion is moved to the second position by its own weight or center of gravity and blocks a laser beam of a light source from being emitted out of the laser scanning unit.

Abstract: A laser scanning unit and an image forming apparatus employing the laser scanning unit including a light source generating light; a polygon mirror that includes a plurality of reflection mirrors with a polygonal horizontal cross-section, and the polygon mirror rotates to scan the beam from the light source in a main scanning direction, and a light interruption member swinging between a shut position and an open position to selectively block or clear the light path to the polygon mirror according to whether the polygon mirror is operated or not. The light interruption member is swung to the opening position by air pressure generated during an operation of the polygon mirror and returns to the shut position by a restoration force when the polygon mirror stops rotating.

Abstract: A laser scanning unit includes a light source for emitting a plurality of laser beams, a rotating polygon mirror for deflecting the plurality of laser beams in a predetermined direction, an f? lens for transmitting the deflected laser beams to be scanned onto the surfaces of a plurality of photosensitive drums, and a beam splitter disposed at a rear end of the f? lens for splitting the laser beams. The laser scanning unit may be used for a tandem image forming apparatus.

Abstract: A beam detector includes a beam detection sensor to receive a light beam emitted from a light source of a light scanning unit and to generate a synchronous signal, a slit member having a slit formed therein to control a time to generate the synchronous signal of the beam detection sensor by adjusting an amount of the light beam received by the beam detection sensor, and a holder in which the slit member is installed. The slit is extended in a vertical direction and, a pair of surfaces form the slit and face each other, one of the pair of surfaces at which a scanned light beam arrives first is inclined in the vertical direction.

Abstract: A laser beam generating apparatus of a laser scanning unit, including: a laser diode; a collimate lens for converting a laser beam emitted from the laser diode to a parallel light; a collimate lens holder for disposing the collimate lens on an optical axis of the laser beam; a base for mounting the laser diode and the collimate lens holder thereon; and a supporting means formed on the base to provisionally fix the collimate lens holder. Since a dedicated implement complements an ultraviolet (UV) bond to provisionally fix the collimate lens holder in the calibration position, assembling errors can be prevented although the UV bond changes in volume while being hardened, thereby improving productivity and quality of goods.

Abstract: A multi-beam laser scanning unit capable of increasing assembly efficiency and productivity by making easy position alignment between a plurality of laser beams. The multi-beam laser scanning unit according to an embodiment of the present invention comprises a laser diode unit for discharging a plurality of laser beams, a rotational member for supporting the diode unit and rotating to a substantially aligned position between a plurality of the laser beams, a fixing member for supporting the rotational member in a rotatable manner, a temporary joining part for maintaining joining status between the rotational member and the fixing member in such a way that the rotational member easily rotates but cannot move very well at the rotated position once rotated when the rotational member rotates for position alignment between a plurality of the laser beams, and a fixing part for fixing the rotated rotational member to the fixing member.

Abstract: A multibeam laser scanning apparatus which can easily align the positions of a plurality of laser beams, thus improving workability and productivity. The multibeam laser scanning apparatus comprises a multibeam light source unit which has a diode unit including a laser diode emitting a plurality of laser beams, a rotating member for supporting the diode unit, and a fixing member for rotatably supporting the rotating member. The rotating member is turned at a predetermined angle to align the positions of the plurality of laser beams and is fixed to the fixing member. The positions of laser beams are aligned in a sub-assembly line for assembling the multibeam light source unit. The assembled multibeam light source unit is simply mounted into a frame in the main assembly line for completing the assembly of a laser scanning apparatus.

Abstract: A multi-beam laser scanning unit includes a plurality of laser diodes to emit laser beams, and a rotary polygon mirror to deflect the laser beams emitted from the plurality of laser diodes in a scan direction of a photoconductive medium. The plurality of laser diodes are arranged in a line so that a connecting line of focal points formed by the laser beams forms a vertical line or substantially a vertical line on the photoconductive medium. The multi-beam laser scanning unit may further include a plurality of delay circuits connected to the laser diodes to delay a beam emission time of a first-emitted laser beam among the plurality of laser beams emitted from the laser diodes.

Abstract: A compression ratio of an engine is varied by changing a position of a crankshaft relative to a piston in accordance with an operational condition of the engine.

Abstract: A plurality of slits are formed on an interior circumference of a piston ring, such that a piston ring can be easily mounted to a piston, and a piston ring mounted with such a piston ring may be easily installed in a cylinder. Additionally, such a piston ring maintains contact to an interior wall of a cylinder during cylinder bore deformation.

Abstract: A compression ratio of an engine is varied by changing a position of a crankshaft relative to a piston in accordance with an operational condition of the engine.