Abstract: An apparatus includes an output voltage sensing unit, which senses an output voltage of a laser diode, which has been sampled during a power control period and transmits the sensed output voltage of the laser diode to an output voltage control unit; the output voltage control unit, which obtains an error voltage between a reference voltage and the sensed output voltage of the laser diode and generates a control voltage by proportionally integrating the error voltage; and an optical power compensation unit, which receives the control voltage and generates a compensated control voltage by compensating for an optical power deviation on the photosensitive drum during the printing period.

Abstract: An apparatus includes an output voltage sensing unit, which senses an output voltage of a laser diode, which has been sampled during a power control period and transmits the sensed output voltage of the laser diode to an output voltage control unit; the output voltage control unit, which obtains an error voltage between a reference voltage and the sensed output voltage of the laser diode and generates a control voltage by proportionally integrating the error voltage; and an optical power compensation unit, which receives the control voltage and generates a compensated control voltage by compensating for an optical power deviation on the photosensitive drum during the printing period.

Abstract: An apparatus includes an output voltage sensing unit, which senses an output voltage of a laser diode, which has been sampled during a power control period and transmits the sensed output voltage of the laser diode to an output voltage control unit; the output voltage control unit, which obtains an error voltage between a reference voltage and the sensed output voltage of the laser diode and generates a control voltage by proportionally integrating the error voltage; and an optical power compensation unit, which receives the control voltage and generates a compensated control voltage by compensating for an optical power deviation on the photosensitive drum during the printing period.

Abstract: An apparatus for supporting an optical component that stably and precisely mounts the optical component for reflecting or permeating a beam emitted from a light source on a frame, and a laser scanner and an image forming device having the same, respectively. The laser scanner includes a light source, a reflective mirror to reflect a beam emitted from the light source, a supporting surface to support the reflective mirror in a predetermined orientation, and at least one horizontal reference surface and at least one vertical reference surface disposed in the supporting surface to provide reference surfaces for measuring a reflective point of the reflective mirror.

Abstract: A light scanning unit of an image forming apparatus, the light scanning unit including: a base frame comprising a metal material to prevent the base frame from expanding and/or contracting due to an ambient temperature change; one or more mounting members provided in the base frame; and one or more optical elements mounted on the base frame by the one or more mounting members, the one or more optical elements generating and/or scanning a light beam.

Abstract: A mirror positioning structure of a reflection mirror for correcting skew and bow and a laser scanning unit employing the same are provided. The mirror positioning structure includes a mirror holder, a fixing member, and a positioning cap. The mirror holder has a reflection mirror on one side and a guide bar disposed on the other side. The fixing member has a guide hole through which the guide bar passes, and the mirror holder is fixed on one surface of the fixing member. The positioning cap is disposed on the other surface of the fixing member and contacts the guide bar. The position cap has an inclined surface for contacting the guide bar to move the guide bar up and down inside the guide hole.

Abstract: An apparatus for supporting an optical component that stably and precisely mounts the optical component for reflecting or permeating a beam emitted from a light source on a frame, and a laser scanner and an image forming device having the same, respectively. The laser scanner includes a light source, a reflective mirror to reflect a beam emitted from the light source, a supporting surface to support the reflective mirror in a predetermined orientation, and at least one horizontal reference surface and at least one vertical reference surface disposed in the supporting surface to provide reference surfaces for measuring a reflective point of the reflective mirror.

Abstract: A mirror positioning structure of a reflection mirror for correcting skew and bow and a laser scanning unit employing the same are provided. The mirror positioning structure includes a mirror holder, a fixing member, and a positioning cap. The mirror holder has a reflection mirror on one side and a guide bar disposed on the other side. The fixing member has a guide hole through which the guide bar passes, and the mirror holder is fixed on one surface of the fixing member. The positioning cap is disposed on the other surface of the fixing member and contacts the guide bar. The position cap has an inclined surface for contacting the guide bar to move the guide bar up and down inside the guide hole.

Abstract: An apparatus includes an output voltage sensing unit, which senses an output voltage of a laser diode, which has been sampled during a power control period and transmits the sensed output voltage of the laser diode to an output voltage control unit; the output voltage control unit, which obtains an error voltage between a reference voltage and the sensed output voltage of the laser diode and generates a control voltage by proportionally integrating the error voltage; and an optical power compensation unit, which receives the control voltage and generates a compensated control voltage by compensating for an optical power deviation on the photosensitive drum during the printing period.

Abstract: A scanner motor assembly has a scanner motor for rotating a polygon mirror, a frame with a plurality of supporting members supporting the scanner motor, a plurality of anti-vibration members interposed between the scanner motor and the frame, and a plurality of fasteners that fix the scanner motor to the frame motor. With this construction, the scanner motor can be retained parallel to the frame because it is laid on the supporting members mounted on the frame, the anti-vibration members interposed between the scanner motor and the frame can reduce vibration, and thus noise generated due to the vibration can be suppressed.

Abstract: An apparatus to detect a laser beam at a predetermined location within a light scanning unit of an image forming apparatus in order to synchronize a start position at which an electrostatic latent image is formed on a surface of a photosensitive body is disclosed. The apparatus includes laser beam detection optics, which may be formed of either a single unit lens or a cluster of one or more lenses that are placed in close proximity of each other. The laser beam detection optics receives the laser beam directed in the direction of the photosensitive body at a predetermined location relative to the start position on the photosensitive body, redirects the received laser beam towards a sensor, and focuses the laser beam on the sensing area of the sensor. The close proximity of, or the fact that the laser beam detection optics, minimizes the possibility of misalignment during the assembly that may result in the improper focusing of the laser beam on the sensor sensing area.

Abstract: An apparatus to detect a laser beam at a predetermined location within a light scanning unit of an image forming apparatus in order to synchronize a start position at which an electrostatic latent image is formed on a surface of a photosensitive body is disclosed. The apparatus includes laser beam detection optics, which may be formed of either a single unit lens or a cluster of one or more lenses that are placed in close proximity of each other. The laser beam detection optics receives the laser beam directed in the direction of the photosensitive body at a predetermined location relative to the start position on the photosensitive body, redirects the received laser beam towards a sensor, and focuses the laser beam on the sensing area of the sensor. The close proximity of, or the fact that the laser beam detection optics, minimizes the possibility of misalignment during the assembly that may result in the improper focusing of the laser beam on the sensor sensing area.

Abstract: An image forming device such as a facsimile telecommunications unit having an improved structure of a self-stacking discharge paper tray includes a housing for the unit, a cover hinged at the sides of the facsimile unit's housing to be capable of being opened and closed, and a paper tray hinged onto the cover so that the rotational path of the cover differs from that of the paper tray, thereby enabling the complete opening of the cover without first removing the paper tray. When the facsimile unit is transported, handling is facilitated and shipping volume is reduced.

Abstract: An improvement of locking lever for use in office automation apparatuses such as a facsimile, a laser printer, a copying machine, etc. The improvement includes a lever having two end portions, for transferring power; a knob mounted fixedly on a central portion of the lever, for rotating the lever in a given direction of locking/unlocking the locking apparatus; and a pair of locking metals attached to the two end portions, for isolating the locking metals onto an object encountered.