Abstract: A light scanning unit may include a light source to emit a light beam and a beam deflector to reflect and scan the light beam emitted from the light source in a main scanning direction. The light scanning unit may also include a beam detecting sensor to detect a horizontal synchronization signal by receiving a part of the light beam and may include a circuit board disposed in part of a trajectory of the light beam such that the light beam is incident on a first surface of the circuit board. The circuit board may include a through-hole formed in the circuit board in the trajectory of the light beam. The beam detecting sensor may be mounted to a second surface of the circuit board which is opposite to the first surface of the circuit board. The light beam may be incident on the beam detecting sensor via the through-hole.

Abstract: A light scanning unit may include a light source to emit a light beam and a beam deflector to reflect and scan the light beam emitted from the light source in a main scanning direction. The light scanning unit may also include a beam detecting sensor to detect a horizontal synchronization signal by receiving a part of the light beam and may include a circuit board disposed in part of a trajectory of the light beam such that the light beam is incident on a first surface of the circuit board. The circuit board may include a through-hole formed in the circuit board in the trajectory of the light beam. The beam detecting sensor may be mounted to a second surface of the circuit board which is opposite to the first surface of the circuit board. The light beam may be incident on the beam detecting sensor via the through-hole.

Abstract: A light scanning unit and an image forming apparatus employing the same. The light scanning unit deflects light in a main scanning direction, irradiates the light on a photoconductive drum, and includes a beam detecting sensor to detect a horizontal synchronization signal by receiving a part of the light beam reflected and scanned by a beam deflector, and leads of terminals of the beam detecting sensor are not exposed to the light beam to be scanned.

Abstract: A light scanning unit and an image forming apparatus employing the same. The light scanning unit deflects light in a main scanning direction, irradiates the light on a photoconductive drum, and includes a beam detecting sensor to detect a horizontal synchronization signal by receiving a part of the light beam reflected and scanned by a beam deflector, and leads of terminals of the beam detecting sensor are not exposed to the light beam to be scanned.

Abstract: An image forming apparatus includes an image forming unit which forms an image, a power supply which converts input alternating current (AC) power and outputs direct current (DC) power having a predetermined level to operate the image forming unit; a mechanical power switch through which the AC power is supplied and/or shut off, a switch circuit unit which includes a soft power switch to select a turned-on status and/or a turned-off status in accordance with a user's handling, and outputs a switch signal corresponding to a status of the soft power switch, a power controller which selectively supplies the DC power from the power supply to the image forming unit on the basis of the switch signal, and a discharging circuit unit which discharges remaining power of the power supply if the AC power is shut off by the mechanical power switch. Accordingly, a user may quickly turn on/off power using a power switch, and mistaken malfunction may be prevented.

Abstract: A method for controlling the fusing temperature and blower speed based on toner coverage computed from data to be printed and apparatuses using the same. The apparatus for controlling a fusing temperature based on a computed toner coverage has a memory for storing a reference fusing temperature by toner coverage, a fusing temperature determining part for computing the toner coverage of the data, and determining the temperature corresponding to the computed toner coverage about the reference temperature, and a heater. The apparatus for controlling of blower speed based on a computed toner coverage has a memory for storing a reference blower speed by toner coverage, a blower speed determining part for computing the toner coverage of the data, and determining the speed corresponding to the computed toner coverage about the reference speed, and a driver for varying the blower speed to the determined blower speed.

Abstract: A color registration control method and an image forming apparatus using the same are provided, wherein the color registration control method includes the steps of developing a registration pattern by overlapping a first pattern and a second pattern each of which having a length in a sub-scanning direction, detecting the densities of an upper pattern and a lower pattern included in the registration pattern, comparing the density of the upper pattern with the density of the lower pattern and generating density information, and outputting a registration control signal by referring to the offset information and the density information.

Abstract: A method for controlling the fusing temperature and blower speed based on toner coverage computed from data to be printed and apparatuses using the same. The apparatus for controlling a fusing temperature based on a computed toner coverage has a memory for storing a reference fusing temperature by toner coverage, a fusing temperature determining part for computing the toner coverage of the data, and determining the temperature corresponding to the computed toner coverage about the reference temperature, and a heater. The apparatus for controlling of blower speed based on a computed toner coverage has a memory for storing a reference blower speed by toner coverage, a blower speed determining part for computing the toner coverage of the data, and determining the speed corresponding to the computed toner coverage about the reference speed, and a driver for varying the blower speed to the determined blower speed.