Abstract: Disclosed is a method of manufacturing a printed circuit board having a landless via hole. Specifically, this invention provides a method of manufacturing a printed circuit board having a landless via hole without the upper land of a via hole using a photoresist (P-LPR) which is loaded in the via hole. Therefore, in this invention, since a circuit pattern is formed using only copper of a copper clad laminate, the width thereof is minimized, thus easily realizing a fine circuit pattern. Further, the landless via hole structure is applied, resulting in a highly dense circuit pattern.

Abstract: The present invention relates to a high density printed circuit board and a method of manufacturing the same which enable a thin printed circuit board to be manufactured and can overcome problems occurring in a conventional method of manufacturing a printed circuit board because a conventional CCL is not used as a raw material. The high density printed circuit board includes a first insulating layer having a constant thickness, and a pair of first circuit layers embedded in two sides of the first insulating layer, respectively.

Abstract: Disclosed is a method of manufacturing a high density printed circuit board, in which a copper clad laminate is not used as a basic material, thus enabling the manufacture of a thin printed circuit board and solving the problems occurring in conventional methods of manufacturing a printed circuit board. The method of manufacturing the printed circuit board according to this invention includes forming a circuit pattern to a predetermined depth in one surface of a copper substrate; placing an insulating layer on the surface of the substrate having the circuit pattern; and etching the substrate, thus exposing the circuit pattern.

Abstract: A method for manufacturing a substrate having a cavity is disclosed. The method comprises: (a) forming a barrier around a predetermined area where the cavity is to be formed on a copper foil laminated master, an internal circuit formed in the copper foil laminated master; (b) coating a thermosetting material in the area where the cavity is to be formed; (c) laminating a dielectric layer and a copper foil layer on the copper foil laminated master, on which the thermosetting material is coated; (d) pressing the laminated dielectric layer and copper foil layer using a press plate, on which a protruded part is formed in an area corresponding to the area where the cavity is to be formed; (e) forming an external circuit pattern in the upper part of the laminated dielectric layer; and (f) dissolving the coated thermosetting material using a solvent and forming the cavity.

Abstract: A drum washing machine in which laundry-separated substances, introduced into a gap of a packing member sealing an inlet of the washing machine during a washing process, are easily eliminated. The drum washing machine includes a main body having an entrance hole for placing laundry therein and a door opening and closing the entrance hole, a tub installed in the main body and having an opening corresponding to the entrance hole, a packing member to seal a space between the opening of the tub and the entrance hole. The packing member including a bending portion in which laundry-separate substances accumulate, and a recess adjacent to the bending portion, wherein the recess is formed in a user contactable position on the packing member for assisting in easy elimination of the laundry-separated substances accumulated in the bending portion.

Abstract: A drum washing machine which includes a detergent supply device which is easily produced and has low production costs, and which allows a user to observe a supply state of a detergent. The drum washing machine includes a main body having an opening, a door having a transparent member to open and close the opening of the main body, the transparent member allowing a user to see the inside of the main body, and a detergent receiving portion formed in the transparent member of the door.

Abstract: A drum washing machine having an improved frame structure, the rigidity of which is reinforced. The drum washing machine includes side frames forming side surfaces thereof, where inclined planes are formed between front and upper surfaces of the side frames so that additional frames for reinforcing the rigidity of upper parts of the side frames are respectively connected to the upper surfaces of the side frames and upper regions of the front surfaces of the side frames. The drum washing machine further includes top brackets respectively connected to the upper surfaces, the inclined planes, and the upper regions of the front surfaces of the side frames for reinforcing the rigidity of upper parts of the side frames. The drum washing machine further includes a front frame, and a bottom panel or a top panel, connected to the side frames for reinforcing the rigidity of front, lower and upper parts of the side frames.

Abstract: A printed circuit board having embedded chips, composed of a central layer having an embedded chip, an insulating layer formed on one surface or both surfaces of the central layer and having a via hole filled with conductive ink, and a circuit layer formed on the insulating layer and having a via hole and a circuit pattern electrically connected to the chip of the central layer through the via hole of the insulating layer. In addition, a method of fabricating a printed circuit board including embedded chips is provided.

Abstract: A washing machine having simplified structure for coupling a bearing housing with a stator and manufactured by a low-cost, simplified process is provided. The washing machine includes a water tub, a rotation tub installed in the water tub, a rotation shaft penetrating the rotation tub and the water tub and extended to the outside of the water tub, a bearing housing installed in the water tub and supporting the rotation shaft, a driving motor, mounted to the outside of the water tub, for rotating the rotation shaft, the driving motor including a stator fixed in the bearing housing and a rotor coupled with the rotation shaft, pre-coupling protrusions protruded from the water tub such that the center of the stator is aligned with the center of the rotation shaft to pre-couple the stator when mounting the stator to the bearing housing, and pre-coupling holes coupled with the pre-coupling protrusions and formed in the stator.

Abstract: Disclosed is a PCB including an embedded passive component and a method of fabricating the same. The PCB includes at least two circuit layers in which circuit patterns are formed. At least one insulating layer is interposed between the circuit layers. A pair of terminals is vertically formed through the insulating layers, plated with a first conductive material, and separated from each other by a predetermined distance. The embedded passive component is interposed between the terminals and has electrodes formed on both sides thereof. The electrodes are separated from the terminals by a predetermined distance and electrically connected to the terminals through a second conductive material.

Abstract: Disclosed is a PCB including an embedded resistor and a method of fabricating the same. The PCB includes a plurality of circuit layers in which circuit patterns are formed. A plurality of insulating layers is each interposed between the circuit layers. The embedded resistor is made of a resistive material and received in a receiving hole formed in the plurality of circuit layers and the plurality of insulating layers such that walls defining the receiving hole extends from one of the circuit layers to another circuit layer. The receiving hole has a closed section, and a conductive material is plated on the opposite walls of the walls defining the receiving hole.

Abstract: Sump assembly in a dishwasher including a sump for holding washing water, a washing pump on one side of the sump for pumping up the washing water from the sump to spray nozzles, a drain pump on the other side of the sump for discharging dirty washing water to an outside of the dishwasher, a drain hose connected to the drain pump for guiding the washing water to the outside of the dishwasher, and a sensor mounted on an inside of the drain pump for measuring a turbidity level of the washing water discharged to the outside of the dishwasher, thereby measuring the turbidity level of the washing water accurately, to enable effective operation of the dishwasher.

Abstract: A washing machine with a detergent supply unit that allows a user to selectively put a powdered or liquid detergent into the same detergent input space and is capable of controlling flow of the detergent in the detergent input space to uniformly mix the detergent in wash water. The detergent supply unit includes a detergent container, at least one detergent input space formed in the detergent container, and a control member disposed in the detergent input space for controlling flow of a detergent in the detergent input space. Alternatively, the control member is disposed in the detergent input space for increasing or decreasing time for which the detergent stays in the detergent input space.

Abstract: A dishwasher is disclosed. The dishwasher includes a washing chamber capable of being opened and closed by a door, at least one rack provided in the washing chamber for placing dishes therein, a sump provided below the washing chamber for containing washing water, a pump for pumping the washing water from the sump, at least one spray arm provided within the washing chamber for sprinkling the washing water pumped by the pump, and a top sprinkler provided in an upper portion of the washing chamber for sprinkling the washing water pumped by the pump directly toward outmost areas of the washing chamber.

Abstract: A method of controlling a dishwasher having a water softening function performed by a water softener is disclosed. The method includes the steps of loading in the dishwasher an item to be washed, supplying washing water through the water softener, washing the loaded item using the supplied washing water, drying the washed item, and regenerating, during said drying step, the water softening function.

Abstract: A broadcasting service providing system has an asynchronous transfer mode switch connected to a broadcasting server through a permanent virtual circuit so as to support a point-to-multipoint connection. A single permanent virtual circuit of the broadcasting server is established between the broadcasting server and the asynchronous transfer mode switch for each broadcasting channel and a permanent virtual circuit for broadcasting is established between the asynchronous transfer mode switch and a subscriber.