Abstract: A transfer unit, which transfers a toner image formed on at least one image support to a printing medium, and an image forming apparatus employing the same. The transfer unit includes: an intermediate transfer body to the toner image from the image support, which has a curved transfer surface and an ASKER-A hardness of from about 25° to 40°; a transfer member, which has an ASKER-C hardness of from about 45° to 70°, and which contacts the intermediate transfer body, with a printing medium being interposed therebetween, and transfers the toner image from the intermediate transfer body to the printing medium. The transfer unit may further include: a de-electrifying member having a DC power and an AC power concurrently applied thereto, to de-electrify the printing.

Abstract: Disclosed herein is an image forming apparatus. The image forming apparatus can include an apparatus body, a cassette detachably mounted to the apparatus body, the cassette being configured to hold print media, and a sensor unit configured to sense whether the cassette is mounted, whether the print media are loaded, and/or whether the print media is properly positioned in the cassette.

Abstract: Disclosed is a printing media supply unit and an image forming apparatus employing the same for forming an image on the printing medium. A loading plate capable of supporting thereon a supply of the printing media is movably coupled to a detachable loading cassette so as to move in ascending and descending manner depending on the amount of printing media loaded on the loading plate. One of more interfering members are provided on the loading plate so as to move with the loading plate, and may be capable of being sensed by one or more sensing units. A control unit determines the amount of printing media based on the sensing results, which may be different from one sensing unit to another, or based on the combination of such sensing results.

Abstract: A transfer unit, which transfers a toner image formed on at least one image support to a printing medium, and an image forming apparatus employing the same. The transfer unit includes: an intermediate transfer body to the toner image from the image support, which has a curved transfer surface and an ASKER-A hardness of from about 25° to 40°; a transfer member, which has an ASKER-C hardness of from about 45° to 70°, and which contacts the intermediate transfer body, with a printing medium being interposed therebetween, and transfers the toner image from the intermediate transfer body to the printing medium. The transfer unit may further include: a de-electrifying member having a DC power and an AC power concurrently applied thereto, to de-electrify the printing.

Abstract: A transfer unit, which transfers a toner image formed on at least one image support to a printing medium, and an image forming apparatus employing the same. The transfer unit includes: an intermediate transfer body to the toner image from the image support, which has a curved transfer surface and an ASKER-A hardness of from about 25° to 40°; a transfer member, which has an ASKER-C hardness of from about 45° to 70°, and which contacts the intermediate transfer body, with a printing medium being interposed therebetween, and transfers the toner image from the intermediate transfer body to the printing medium. The transfer unit may further include: a de-electrifying member having a DC power and an AC power concurrently applied thereto, to de-electrify the printing.

Abstract: Disclosed herein is an image forming apparatus. The image forming apparatus can include an apparatus body, a cassette detachably mounted to the apparatus body, the cassette being configured to hold print media, and a sensor unit configured to sense whether the cassette is mounted, whether the print media are loaded, and/or whether the print media is properly positioned in the cassette.

Abstract: A transfer unit, which transfers a toner image formed on at least one image support to a printing medium, and an image forming apparatus employing the same. The transfer unit includes: an intermediate transfer body to the toner image from the image support, which has a curved transfer surface and an ASKER-A hardness of from about 25° to 40°; a transfer member, which has an ASKER-C hardness of from about 45° to 70°, and which contacts the intermediate transfer body, with a printing medium being interposed therebetween, and transfers the toner image from the intermediate transfer body to the printing medium. The transfer unit may further include: a de-electrifying member having a DC power and an AC power concurrently applied thereto, to de-electrify the printing.

Abstract: A spindle motor and a spindle motor assembly, and an image forming device having the same. The spindle motor includes a shaft rotatably coupled to a stator, a rotor to rotate with the shaft, and a dynamic pressure generator to generate a dynamic pressure to make the rotor contact toward the stator by an ambient air flow generated during a rotation of the rotor.

Abstract: A laser scanning unit includes a housing; an optical system disposed in the housing and including an optical source which emits a laser beam, a polygonal mirror which scans the laser beam, and a plurality of optical elements which image the laser beam on an image surface; a motor disposed in the housing and which rotates the polygonal mirror; and a motor drive chip disposed outside of the housing and which uses a sensorless algorithm to control a rotation speed of the motor.

Abstract: A hydrodynamic bearing having an improved air discharging path for discharging air from the bearing when a shaft is inserted into the bearing, and an apparatus for driving a polygonal mirror using the hydrodynamic bearing.

Abstract: A hydrodynamic bearing having an improved air discharging path for discharging air from the bearing when a shaft is inserted into the bearing, and an apparatus for driving a polygonal mirror using the hydrodynamic bearing.

Abstract: A laser scanning unit includes a housing; an optical system disposed in the housing and including an optical source which emits a laser beam, a polygonal mirror which scans the laser beam, and a plurality of optical elements which image the laser beam on an image surface; a motor disposed in the housing and which rotates the polygonal mirror; and a motor drive chip disposed outside of the housing and which uses a sensorless algorithm to control a rotation speed of the motor.