摘要:
A semiconductor chip, a tape package of the chip and a tape wiring substrate of the chip may be configured so as to effectively radiate heat generated from the chip externally through certain wiring patterns connected to certain pads. In an example, the chip may include a plurality of input pads along at least one edge of an active surface. The input pads may include power pads and ground pads. The chip may include a plurality of output pads along edges of the active surface, outside of the input pads. The power pads and the ground pads may be located at a central area of the at least one edge.
摘要:
A semiconductor chip, a tape package of the chip and a tape wiring substrate of the chip may be configured so as to effectively radiate heat generated from the chip externally through certain wiring patterns connected to certain pads. In an example, the chip may include a plurality of input pads along at least one edge of an active surface. The input pads may include power pads and ground pads. The chip may include a plurality of output pads along edges of the active surface, outside of the input pads. The power pads and the ground pads may be located at a central area of the at least one edge.
摘要:
Disclosed is a method of fabricating a multi-layered PCB, in which the optical waveguide component is inserted into the PCB in such a way that a prepreg adhesive does not block an optical signal entrance of the optical waveguide. The method comprises pre-routing a portion of an adhesive meeting the optical waveguide to remove said portion, processing an adhesive weeping prevention layer so as to prevent the adhesive from blocking the optical signal entrance of the optical waveguide, arranging the optical waveguide, the adhesive, and the adhesive weeping prevention layer on a copper clad laminate, and combining the optical waveguide, a prepreg, and the adhesive weeping prevention layer with each other into a single structure. The adhesive weeping prevention layer is selected from the group consisting of a prepreg, a single-sided copper clad laminate, a thermally curable resin, a heat spreader, and an unclad.
摘要:
The present disclosure relates to a method for removing anions such as nitrate ion, sulfate ion, chloride ion, and phosphate ion existing in underground water, surface water or waste water. The method involves adding alumina cement and a calcium compound to the water containing the anion followed by applying an electric field thereto, thereby forming a chemical precipitate which is an insoluble complex salt. The disclosure also relates to a continuous process for removing the anion by continuously performing the above method for removing anions.
摘要:
Disclosed is a method of fabricating a multi-layered PCB, in which the optical waveguide component is inserted into the PCB in such a way that a prepreg adhesive does not block an optical signal entrance of the optical waveguide. The method comprises pre-routing a portion of an adhesive meeting the optical waveguide to remove said portion, processing an adhesive weeping prevention layer so as to prevent the adhesive from blocking the optical signal entrance of the optical waveguide, arranging the optical waveguide, the adhesive, and the adhesive weeping prevention layer on a copper clad laminate, and combining the optical waveguide, a prepreg, and the adhesive weeping prevention layer with each other into a single structure. The adhesive weeping prevention layer is selected from the group consisting of a prepreg, a single-sided copper clad laminate, a thermally curable resin, a heat spreader, and an unclad. Therefore, the method is advantageous in that the prepreg and the adhesive weeping prevention layer are pre-routed to prevent epoxy resin from blocking the optical signal entrance of the optical waveguide, thereby facilitating precise interfacing of optical signals.
摘要:
Disclosed is a method of attaching an optical waveguide component to a printed circuit board, which is a double-sided or a multilayer printed circuit board, through pre-bonding and main-bonding by use of an adhesive tape. Prior to being attached to the printed circuit board, the optical waveguide component is preferably subjected to a plasma surface treatment to give a surface roughness thereto. The present method is advantageous in that the optical waveguide component can be attached to the printed circuit board with improved flatness and precise alignment without causing chemical or thermal damage to the optical waveguide component.
摘要:
Disclosed herein is an optical signal coupling block, and a multi-layer printed circuit board and the method for coupling optical signals between layers of a multi-layer printed circuit board (PCB) using optical signal coupling blocks. The optical signals between the layers are coupled through the steps of forming a plurality of optical via holes in the multi-layer PCB to which optical waveguides for transmitting optical signals are attached; inserting the optical signal coupling blocks into the plural optical via holes such that the optical signal coupling blocks are connected to the optical waveguides to transmit the optical signals; forming at least one connection part to couple optical signals between the optical waveguides and the optical signal coupling blocks; and interconnecting the optical waveguides and the optical signal coupling blocks by aligning positions of the optical waveguides and the optical signal coupling blocks.
摘要:
A steel-concrete composite beam includes a long rectangular steel frame; concrete members installed at only both ends of the steel frame, excluding a center portion thereof; a prestressable reinforcement buried in the concrete member; and a stirrup reinforcement arranged to the concrete member with a regular gap thereto to surround a lower flange of the steel frame.
摘要:
Disclosed is a method of attaching an optical waveguide component to a printed circuit board, which is a double-sided or a multilayer printed circuit board, through pre-bonding and main-bonding by use of an adhesive tape. Prior to being attached to the printed circuit board, the optical waveguide component is preferably subjected to a plasma surface treatment to give a surface roughness thereto. The present method is advantageous in that the optical waveguide component can be attached to the printed circuit board with improved flatness and precise alignment without causing chemical or thermal damage to the optical waveguide component.
摘要:
Disclosed is a printed circuit board with opto-via holes for transmitting an optical signal to an optical waveguide in the PCB, and a process of forming the opto-via holes. The process comprises forming a plurality of via holes on a plurality of copper clad laminates using a drill, plating an inner wall of each via hole, exposing and etching the plated portions of an upper and lower side of each copper clad laminate to form a circuit pattern on the upper and lower side of the copper clad laminate, layering the patterned copper clad laminates on each other using an insulating resin adhesive, and removing the insulating resin adhesive in the predetermined via holes to form opto-via holes. Therefore, the process is advantageous in that the optical signal is stably transmitted to the optical waveguide in the PCB without damage to the optical waveguide directly exposed to an external environment, and the optical waveguide suitable to physical properties of the material constituting the PCB is easily inserted between the inner layer and the outer layer.