Abstract: An image forming apparatus that may be easily and inexpensively manufactured is provided. The image forming apparatus includes: a toner supply unit; an image forming element to which toner is adsorbed from the toner supply unit; an image developing unit disposed on an outer side of the image forming element, wherein said image developing unit selectively separates from the image forming element at least a part of the toner adsorbed to the image forming element in order to develop an image on the image forming element; and a toner return unit which returns the toner separated from the image forming element by the image developing unit to the toner supply unit.

Abstract: An image drum for selectively adsorbing a toner thereon so as to form an image in a printing apparatus. The image drum provides a new manufacturing method which can connect ring electrodes formed on the circumferential surface of a drum body and a printed circuit board including a control chip for supplying a necessary voltage to each ring electrode without using a laser processing. Namely, various manufacturing methods, such as a method of forming a connection hole by initially forming a bead made of a hydrophobic material or a conductive bump and removing the initially formed bead or conductive bump, and forming a ring electrode by filling a conductive material in the connection hole, and the structure thereof are provided. Accordingly, due to a simplified manufacturing process, manufacturing cost are reduced and an image drum may be more widely disseminated.

Abstract: An image drum device and a method of manufacturing the image drum are provided. The method includes forming electrodes, electrically insulated from each other and disposed parallel to each other, on a flexible substrate; bonding a control unit to the flexible substrate; disposing opposite ends of the flexible substrate to face each other; inserting the control unit and the ends of the flexible substrate into a slit which is longitudinally formed in a drum body; and attaching the flexible substrate to the drum body. The image drum includes a drum body having a slit longitudinally therein; a flexible substrate including electrodes, electrically insulated from each other, disposed parallel to each other, and formed on an outer surface thereof, the flexible substrate attached to and covering the drum body; and a control unit which is inserted into the slit together with opposite ends of an outer surface of the flexible substrate.

Abstract: An image drum, for selectively adsorbing a toner on the image drum so as to form an image in a printing apparatus, includes a hollow cylindrical drum body and an electrode member. The electrode member includes a flexible substrate adapted to surround an outer circumferential surface of the drum body; a plurality of ring-shaped electrodes formed circumferentially on a top surface of the flexible substrate so as to be electrically insulated from one another; and a control unit disposed on a bottom surface of the flexible substrate for independently applying a voltage to each of the ring-shaped electrodes. The electrode member is disposed on the outer circumferential surface of the drum body.

Abstract: A plate-shaped heater having a PTC temperature sensor to sense a temperature of the plate-shaped heater, and a steam cooking apparatus including the same. The plate-shaped heater includes an insulating substrate, a heating element formed of a resistor pattern-printed on the insulating substrate to generate heat, and a PTC temperature sensor to sense a heating temperature of the heating element. The PTC temperature sensor is pattern-printed on the insulating substrate, and therefore, has the effect of eliminating the risk of unintentional separation thereof, and achieving a simplified manufacturing process and reduced manufacturing costs. The PTC temperature sensor is disposed on the insulating substrate in an axis of direction having a wide distance between neighboring temperature contour lines, to achieve accurate temperature sensing capability thereof.

Abstract: The steam cooking apparatus includes a cooking compartment and a steam generating unit disposed at the outside of the cooking compartment and adapted to generate steam to be supplied into the cooking compartment. The steam generating unit includes a steam generating container to receive water therein, the steam generating container having a partitioned steam generating space, and a plate-shaped heater to heat the water received in the steam generating container. The plate-shaped heater includes a plurality of heating elements having different outputs from one another, thereby having the effect of enabling rapid and proper supply of steam required to cook different foods. The steam generating container is provided with an intercepting member, which divides the steam generating container into a water level sensing chamber and a steam generating chamber. The intercepting member prevents fluctuation of water level between the steam generating chamber and the water level sensing chamber.

Abstract: A linear vibration motor comprising a movable unit, a base assembly having a coil assembly, a housing and an elastic member, in which the movable unit has the maximum mass from a fixed housing volume. The elastic member has the outer periphery fixed to the ceiling of the housing and the inner periphery fixed to the top of the movable unit opposed to the outer periphery. The elastic member is deformable to the extent that the outer and inner peripheries are shift to a coplanar position from a parallel position where they are spaced for a predetermined distance from each other. The core assembly is distanced downward from the movable unit or a predetermined gap.