Abstract: A heater is provided with a bulb, a first heating element which has a negative temperature coefficient of resistance and a first rated heating power and forms a first coil in the bulb, a second heating element which has a positive temperature coefficient of resistance and a second rated heating power that is lower than the first rated heating power and is disposed in the bulb. The second heating element is placed adjacent to the first heating to heat the first heating element at an initial stage of a power supplying to the heater, thereby reducing resistance of the first heating element.

Abstract: A device for fusing a predetermined toner image on a paper and which electrically insulates a heating body of a fusing unit from a power supply unit by heating the heating body using an induced current generated by a transformer. The fusing device includes an insulation unit for generating an induced current in response to an alternating current, a heating body heated by the generated induced current, a toner fusing unit which fuses the toner image on the paper using the heat received from the heating body, and a tube-expansion adhesion portion closely adhering the heating body to the toner fusing unit using a predetermined tube-expansion pressure.

Abstract: A device for fusing and fixing a transferred toner of a predetermined image onto a print paper is provided. In particular, a fusing device which can instantly control induced current provided to a fusing unit in an image printing apparatus which heats the fusing unit using the induced current is provided. The fusing device includes a fusing unit which is resistance heated or induction heated by an induced current, and fuses the toner onto the print paper using the generated heat. A sensing unit senses the temperature of the fusing unit. A reference current generating unit generates a predetermined reference current to heat the fusing unit to reach a predetermined temperature based on the temperature of the sensed fusing unit and the reference temperature. A pulse width modulation signal generating unit generates a pulse width modulation signal for generating the induced current so that the induced current corresponding to the reference current is supplied to the fusing unit.

Abstract: A device for fusing a predetermined toner image on a paper and which electrically insulates a heating body of a fusing unit from a power supply unit by heating the heating body using an induced current generated by a transformer. The fusing device includes an insulation unit for generating an induced current in response to an alternating current, a heating body heated by the generated induced current, a toner fusing unit which fuses the toner image on the paper using the heat received from the heating body, and a tube-expansion adhesion portion closely adhering the heating body to the toner fusing unit using a predetermined tube-expansion pressure.

Abstract: A fusing apparatus includes a heating unit to generate heat to fuse an image onto a printing medium, a pressurizing roller that faces and contacts the heating unit having an endless fusing film that is rotated while facing and contacting the pressurizing roller and presses the printing medium toward the heating unit, a nip forming member including a main body formed inside the fusing film to surround a heat source and contacts a portion of the fusing film to the pressurizing roller to form a nip. The fusing apparatus further includes a supporting member to support the nip forming member.

Abstract: A fixing device includes a fixing roller, a fixing belt which is made to rotate by a rotation force received from the fixing roller, a nip forming unit to form a nip zone at a contact area between the fixing roller and the fixing belt, and a first heating unit, which is separated from the nip zone, to apply heat to the fixing belt. The nip zone and the heating unit are separated, so that the heating unit can be prevented from being broken as a result of the pressurization and thermal deformation.

Abstract: A device for fusing a predetermined toner image on a paper and which electrically insulates a heating body of a fusing unit from a power supply unit by heating the heating body using an induced current generated by a transformer. The fusing device includes an insulation unit for generating an induced current in response to an alternating current, a heating body heated by the generated induced current, a toner fusing unit which fuses the toner image on the paper using the heat received from the heating body, and a tube-expansion adhesion portion closely adhering the heating body to the toner fusing unit using a predetermined tube-expansion pressure.

Abstract: An image heating apparatus including: a pressure member; a fixing roller to rotate on the pressure member; a heater to heat an external surface of the fixing roller; and a film to be heated by the heater. While passing through a gap between the pressure member and the fixing roller, the film may form a nip with the pressure member. The image heating apparatus may reduce an initial warm-up time through a film heating operation, and may utilize the fixing roller as a heat reservoir by heating the fixing roller.

Abstract: An image heating apparatus includes a pressure roller, a belting film to circulate while partially connecting with the pressure roller, a support member to be provided in the belting film and comprises a guide to guide the circulating of the belting film, a nip spring to comprise a nip portion to form a nip between the belting film and the pressure roller, and a support portion to support the nip portion against the support member, and a heater to be provided adjacent to the nip spring and transfer heat to the image through the belting film.

Abstract: A fixing unit which enables high-speed operation and miniaturization, and an image forming apparatus having the fixing unit, includes a heating member which is heated by a heat source, the heating member having a predetermined width; a rotating member to rotate in contact with the heating member; a driving member to rotate the rotating member; and a pressing member to press both sides of the heating member towards the driving member and to form a predetermined fixing nip between the rotating member and the driving member, wherein the heating member has a second moment of inertia which is set to maintain a fixing efficiency of 90% or more in a central portion of the heating member.

Abstract: A fixing device includes a pressing roller, a fixing belt to receive a rotation force transferred from the pressing roller and to rotate thereby, a nip forming member which is mounted inside the fixing belt, the nip forming member including a heat transmission unit formed thereon, and a heat source, which is mounted inside the nip forming member, to simultaneously apply heat to the nip forming member and to the fixing belt through the heat transmission unit.

Abstract: A fusing apparatus in an image forming apparatus that heats a fusing unit by applying an induced current is provided. The flicker characteristics of the fusing apparatus are improved by gradually increasing the amount of induced current applied to the fusing unit for a predetermined amount of time so that the amount of induced current applied to the fusing unit is prevented from severely varying. The fusing apparatus comprises a fusing unit which is resistance-heated or induction-heated by applying an induced current and fuses toner onto paper using the heat. The fusing apparatus further comprises a pulse width modulation (PWM) signal generation unit which generates a PWM signal in response to the ON signal so that the amount of induced current input to the fusing unit gradually increases to a reference current.

Abstract: A fusing device for fusing a predetermined toner image on paper, and which controls the heating range of a fusing unit by inputting an eddy current generated by a transformer to a terminal corresponding to the size of paper selected from a plurality of terminals of the fusing unit. The fusing device includes a power supply unit to which a predetermined alternating current is input and which generates an induced current in response to the input alternating current, a fusing unit being resistance-heated and induction-heated by the induced current and fusing the toner image on the paper using the generated heat, and a controller for controlling the induced current supplied to the fusing unit according to the size of the paper.

Abstract: A fusing roller and a fusing device using the fusing roller. The fusing roller applies heat to a toner image and fuses the toner image onto a piece of paper and is heated by a coil connected to an external power source. The fusing roller includes a pair of end caps which are provided at opposite ends of the fusing roller, a connection electrode which is disposed in one of the end caps and connected to the external power source, and an adherence member which is coupled with the connection electrode, and having an end portion of the coil disposed between the adherence member and the connection electrode to ensure an electric connection between the coil and the connection electrode.

Abstract: A fusing apparatus includes a heating unit to generate heat to fuse an image onto a printing medium, a pressurizing roller that faces and contacts the heating unit having an endless fusing film that is rotated while facing and contacting the pressurizing roller and presses the printing medium toward the heating unit, a nip forming member including a main body formed inside the fusing film to surround a heat source and contacts a portion of the fusing film to the pressurizing roller to form a nip, a plurality of opening forming portions connected to the main body and form an opening portion such that heat generated from the heat source directly arrives at the fusing film via the opening portion, and a plurality of adhering portions connected to the opening forming portions, are separated from each other, having the opening portion therebetween, and contact the fusing film, and a supporting member to support the nip forming member.

Abstract: A heating roller includes an exterior aluminum pipe preferably coated with a Teflon layer. A primer layer is disposed inside the exterior aluminum pipe. An outer insulating layer is disposed inside the primer layer. A heating coil is disposed inside the outer insulating layer. An inner insulating layer is disposed inside the heating coil. An aluminum interior pipe is disposed inside the inner insulating layer, and has a predetermined expandability. The heating roller is used as an image fixing unit for fixing a developed image on a recording medium while being pressed by a pressing roller at a predetermined pressure.

Abstract: A fixing device includes a fixing roller, a fixing belt which is made to rotate by a rotation force received from the fixing roller, a nip forming unit to form a nip zone at a contact area between the fixing roller and the fixing belt, and a first heating unit, which is separated from the nip zone, to apply heat to the fixing belt. The nip zone and the heating unit are separated, so that the heating unit can be prevented from being broken as a result of the pressurization and thermal deformation.

Abstract: A fixing device includes a fixing roller, a fixing belt which is made to rotate by a rotation force transferred from the fixing roller, a heat source which is mounted inside the fixing belt, a guide member, which is mounted inside the fixing belt, to guide the rotation of the fixing belt, and a belt meander preventing unit, which is mounted on the guide member, to elastically support both sides of the fixing belt and to prevent the fixing belt from meandering. Therefore, the sides of the fixing belt are elastically supported to gently absorb a reaction force acting on the end portion of the fixing belt, and accordingly it is possible to prevent the fixing belt from being damaged and meandering.

Abstract: A fixing unit which enables high-speed operation and miniaturization, and an image forming apparatus having the fixing unit, includes a heating member which is heated by a heat source, the heating member having a predetermined width; a rotating member to rotate in contact with the heating member; a driving member to rotate the rotating member; and a pressing member to press both sides of the heating member towards the driving member and to form a predetermined fixing nip between the rotating member and the driving member, wherein the heating member has a second moment of inertia which is set to maintain a fixing efficiency of 90% or more in a central portion of the heating member.

Abstract: A fixing device includes a pressing roller, a fixing belt to receive a rotation force transferred from the pressing roller and to rotate thereby, a nip forming member which is mounted inside the fixing belt, the nip forming member including a heat transmission unit formed thereon, and a heat source, which is mounted inside the nip forming member, to simultaneously apply heat to the nip forming member and to the fixing belt through the heat transmission unit.