摘要:
A computer program generates a wire routing pattern that connects one driver with a plurality of receivers. The overlapping length of each vector pair, which consists of any two vectors headed from the driver to the receivers, is calculated. One vector pair that has the greatest overlapping length is selected. For the selected vector pair, three kinds of common nodes are created, each of which is used to make a common path part of the way to the receivers, to generate three kinds of renewed vector patterns. The operations are repeated and plural candidate routing patters are acquired. One candidate routing pattern having the smallest total wiring length is selected as the optimum routing pattern. If there exist plural patterns that have the same smallest total wiring length, one pattern can be selected that has the smallest one of the greatest D-R path lengths.
摘要:
A method of manufacturing a multilayer wiring board is provided. A flat surface is formed on a surface of a multilayer wiring layer, and resistive material is deposited on the flat surface. The multilayer wiring board comprises a multilayer wiring layer on whose surface convexo-concave is formed, a dummy layer burying the convexo-concave, a resistance material layer made of an electrical resistance material deposited on the dummy layer and at an area going beyond the dummy layer, and a wire made of a conductive material deposited on the resistance material layer and ranging from the area going beyond the dummy layer to a part of the flat surface area of the dummy layer, wherein a resistive element is formed at an area of the resistance material layer that the wire does not reach.
摘要:
A polishing surface cleaning method and apparatus are capable of effectively removing the polishing residue from the polishing surface of a polishing table in a polisher by using a minimal amount of cleaning liquid. In the polisher, a workpiece to be polished is pressed against the polishing surface of the polishing table to polish the workpiece by relative motion between the polishing surface and the workpiece. The polishing surface cleaning apparatus uses mixing spray nozzles for mixing together a cleaning liquid and a gas and spraying the resulting fluid mixture on the polishing surface to clean it.
摘要:
A polishing surface cleaning method and apparatus are capable of effectively removing the polishing residue from the polishing surface of a polishing table in a polisher by using a minimal amount of cleaning liquid. In the polisher, a workpiece to be polished is pressed against the polishing surface of the polishing table to polish the workpiece by relative motion between the polishing surface and the workpiece. The polishing surface cleaning apparatus uses mixing spray nozzles for mixing together a cleaning liquid and a gas and spraying the resulting fluid mixture on the polishing surface to clean it.
摘要:
A vertical sealing device for a packing machine includes a pair of feed units for feeding a cylindrical-formed packaging material and a center heat sealer for the heat-sealing of a vertical seam of the packaging material. When the operation of the machine is halted, the feed units feed the packaging material from a steady speed mode to a deceleration mode. During this deceleration mode, the operation of the center heat sealer is stopped. On the other hand, when the operation of the packing machine is restarted, the feed units feed the packaging material in an acceleration mode, and during this acceleration mode, the center heat sealer starts operating.
摘要:
On a floor of a building, a wiring layout of information circuits which are used by personnel who work at a plurality of blocks, has at each block outlet connectors connected to information devices at the block. An interconnection unit has primary connectors connected to extend devices e.g. telephone exchange or network controller, and secondary connectors. Wiring structures each having a plurality of wiring cables connect respective groups of the secondary connectors to respective blocks. Interconnection cables detachably and interchangeably connect the primary and secondary connectors at the interconnection unit. To enable efficient and simple re-arrangement for the information circuits, first identification signs, e.g. colors, identify blocks associated with the respective wiring cables, and at the interconnection unit, the secondary outlets connected by one of the wiring structures to one of the blocks are grouped together in space and have associated with them an identification sign which is the same as the first identification sign identifying the block to which they are connected.
摘要:
In an LSI package, terminal resistance elements are formed of resistive paste which, consisting of a mixture of fine powder of either oxidized metal or carbon and fine powder of glass, is buried and sintered in a ceramic wiring board in the direction to penetrate it. Front side wiring, connecting the parts of the terminal resistance elements exposed on the front face of the ceramic wiring board to input/output circuits of the LSI chip to be mounted on the front face of the ceramic wiring board, is formed on the front face of the ceramic wiring board and in the top layer of the ceramic wiring board. Back side wiring, connecting the parts of the terminal resistance elements exposed on the back face of the ceramic wiring board to a voltage clamp wiring network, is formed on the back face of the ceramic wiring board.
摘要:
An optical fiber connector assembly includes a connector housing having a plug-receiving cavity. A plug connector is provided for terminating an optical fiber and includes a forward mating end for surrounding a core of the fiber. The plug connector includes a rearward engaging portion for selective interengagement with a second plug connector in parallel with the first plug connector. The forward mating end is insertable into the plug-receiving cavity of the connector housing while the rearward engaging portion is exposed exteriorly of the cavity when the mating end is fully inserted into the cavity. Therefore, the plug connector can be used individually with the connector housing or interengaged with the second plug connector.
摘要:
An electronic-circuit assembly of the present invention comprises a plurality of film carriers which are stacked. Respective film carriers have a plurality of through-holes. One of through-holes is provided on corresponding position to another through-hole in the stacked direction of the substrate. Two of adjacent film carriers are connected by the corresponding through-holes. A connection member is provided in two of adjacent through-holes in the stacked direction of the substrates. A connection state between film carriers can be easily checked. Since it is visually checked that solder appears inside the topmost through-hole. Furthermore, wiring lengths for connection between substrates can be reduced. Since the plurality of substrates are three-dimensionally connected.
摘要:
A multilayer wiring substrate is disclosed. The wiring substrate is provided with a substrate section made of a ceramic material. A plurality of power-supply wiring layers are formed within the substrate section. Additionally, a plurality of first and second through-holes penetrate the substrate section. Formed on a wall surface of the section to define each of the first through-holes are first electrically conductive metal layers, each of which is connected electrically to at least one of the power supply wiring layers. Formed on a wall surface of the section to define each of the second through-holes are coating layers of a fluoride resin dielectric. Second electrically conductive metal layers are formed on the coating layers, respectively. There is also provided a circuit supplied with power via the first electrically conductive metal layers and with signals via the second electrically conductive metal layers.There is further disclosed a method of manufacturing a multilayer wiring substrate.