Abstract:
PROBLEM TO BE SOLVED: To provide a wiring circuit board that suppresses noise radiation during transmission of a high frequency signal. SOLUTION: A grounding conductor layer 7 is formed on the lower surface of a base insulating layer 1. A mesh zone 70 is formed in a region of the grounding conductor layer 7 opposed to a signal transmission line 2 with the base insulating layer 1 disposed therebetween. A grounding surface insulating layer 8 is formed so as to cover the region of the mesh zone 70 in the grounding conductor layer 7. A grounding surface shielding layer 9 is formed so as to cover the grounding surface insulating layer 8 and so as to contact the grounding conductor layer 7 outside of the grounding surface insulating layer 8. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a printed circuit board having a stepped conduction layer that can be used to resolve the problem of mixed signals in a printed circuit board equipped with various parts and components, including an analog circuit and digital circuit, etc. SOLUTION: The printed circuit board having stepped conduction layers is provided in which at least the one conduction layer 310 or 320 configured for use as a signal transmission layer is divided into a base regions 320a and a connecting region 320b connecting any two of the base regions 320a, where the connecting region 320b is stepped to a lower height than those of the base regions 320a. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a printed circuit board capable of increasing resistance and controlling resistance variation in one signal line within a predetermined scope. SOLUTION: The printed circuit board includes a signal line layer and a ground layer where signal lines are disposed. The ground layer has a formed trace surface by mutually connecting a plurality of traces. An orthographic projection of the signal line to the ground layer mutually intersects with sides of the traces in the ground layer through which the orthographic projection passes. Namely, because the orthographic projections of every signal line to the ground layer are not overlapped on each side of the traces in the ground layer through which the orthographic projection passes, the system can control the resistance of one signal line, vary the resistance in a small scope, and increase quality in signal transmission. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a flexible printed board which copes fully with noise while maintaining durability and flexibility at a bent part of an FPC. SOLUTION: This flexible printed board is produced by a method comprising: forming a second ground bent line in a mesh shape in the surface side of the base layer 12 of the bent part 2 of FPC 1; forming a third ground bent line crossing transversely the second ground bent line; forming a first ground bent line 16 along the bent direction in the reverse surface side of the base layer 12; and connecting electrically the first ground bent line 16, the second ground bent line 20 and the third ground bent line 22 by a through hole 26. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a light source module, a light source apparatus, and a liquid crystal display apparatus whereby the luminance can be uniformized and the heat dissipation performance of LED elements can be enhanced. SOLUTION: The light source module 11 includes LED chip groups 12 each comprising red, green, blue color LED chips 12R, 12G, 12B, and wiring boards 13 on which a plurality of sets of the LED chip groups 12 are mounted. In each of the LED chip groups 12 of each set, the LED chips 12R, 12G, 12B are respectively located on the apices of a triangle so that the interval among the LED chips 12R, 12G, 12B is substantially equal to each other. One side of each of the wiring boards 13 is formed as an element forming side 13A located with the plural sets of the LED chip groups 12, an external connection terminal 15, and a wiring pattern 14 for electrically connecting the LED chip groups 12 and the external connection terminal 15. The other side of each of the wiring boards 13 is formed as a heat dissipation side 13B thermally connected to the element forming side 13A for externally dissipating the heat produced by the element forming side 13A. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
According to the present invention, for a module in which a plurality of integrated circuit devices are mounted in parallel, the inductance generated by the unit length of a branched signal line on a motherboard is so set that it is smaller for a branched signal line a longer distance from its branching point to its distal end, and is so set that it is larger for a branched signal line having a shorter distance from its branching point to its distal end, so that the time required for transmission of a signal from the branching point to the distal end of each branched signal line is the same.
Abstract:
PROBLEM TO BE SOLVED: To provide a flexible rigid wiring board that is excellent in connection reliability, by preventing the deformation of a substrate which easily occurs in a bent section, the disconnection of a conductor circuit, and the formation of swelling etc. SOLUTION: The flexible rigid wiring board is provided with a hard rigid substrate and a bendable flexible substrate having the conductor circuit covered with a cover lay on an insulating substrate. In the wiring board, the insulating substrate is composed of a glass cloth formed in a bendable state by impregnating a resin into the substrate. In addition, the wiring pattern in the bent section of the conductor circuit has a wide width or is curved in the width direction. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a signal transport substrate that is electromagnetically shielded to obtain a much higher degree of freedom when designing a trace pattern or trace width of a signal line and to obtain a much higher degree of freedom also when adjusting a characteristic impedance. SOLUTION: A signal line 20 is provided along a lengthwise direction on one surface of a flat band-like flexible insulating substrate 30, net conductors 50, 60 are laminated for electromagnetically shielding the signal line 20 on both sides of the flexible insulating substrate 30, and meshes 56, 66 of the net conductors 50, 60 are formed at random to comprise a flat flexible cable 10 that is a signal transport substrate. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method and a structure for reinforcing interconnection performance between a land grid array (LGA) module and an electrical connector such as a printed wiring board. SOLUTION: A multilayer printed wiring board comprises a plurality of preformed ground layers and power supply layers. At least one of the preformed ground layers and power supply layers comprises a structure for reducing a thickness change to a minimum in order to reduce changes in the thickness to a minimum. The structure for reducing the thickness change to a minimum comprises an aperture pattern in the selected area of at least one layer of the preformed ground layers and power supply layers. The selected area is located near a preformed module site such as an LGA module site in the ground layers and the power supply layers. The selected area may include a region surrounding each preformed module site and also can also include one region in the module site. COPYRIGHT: (C)2005,JPO&NCIPI