Abstract:
A printed wiring board manufacturing method includes weaving a glass fiber cloth with warp and weft yarns such that the warp and weft yarns are visually distinguishable at least a region. The glass fiber cloth is impregnated with a resin to fabricate a substrate. A copper foil is formed on at least one surface of the substrate to fabricate a core substrate. The copper foil is removed within the region on the core substrate to form an opening. A pitch between the warp yarns or between the weft yarns which are presented in the opening is detected. A pitch between a pair of differential wirings to be patterned is determined based on the detected pitch between the warp yarns or between the weft yarns. The pair of differential wirings is patterned on the core substrate in accordance with the determined pitch between the pair of differential wirings.
Abstract:
A method for manufacturing an optical waveguide in which multiple cores are embedded in a parallel-arranged fashion within a single cladding, the cores having a refractive index of light different from that of the cladding, the method includes forming the multiple cores in a state where the adjacent cores are connected by a rib, forming the cladding around the rib and the multiple cores by curing a cladding material there around, and a cutting to the rib.
Abstract:
A wiring board including a plated through hole formed in the wiring board; a test plated through hole or a test via hole provided in the surrounding area of the plated through hole to check a processing state related to the plated through hole; and a conductive pattern used to electrically connect the plated through hole to the test through hole or the test via hole.
Abstract:
A wiring board including a plated through hole provided on the wiring board, and an indicator provided around the plated through hole. The indicator indicating a processing state related to the plated through hole.
Abstract:
A depression is formed in a first surface of a printed wiring board. A through hole penetrates through the printed wiring board from the bottom surface of the depression to a second surface of the printed wiring board. The second surface is the opposite surface of the first surface. A terminal of an electronic component is received in the through hole. The terminal has the tip end protruding from the second surface of the printed wiring board. Solder is filled in the through hole. The tip end of the terminal is allowed to protrude from the second surface of the printed wiring board even when the terminal is shorter than the original thickness of the printed wiring board. It is not necessary to change the length of the terminal.
Abstract:
A wiring board unit includes a connector having a plurality of terminals; and a wiring board on which the connector is mounted. The wiring board includes a first wiring pattern provided on a first wiring layer, a second wiring pattern provided on a second wiring layer at a position shallower than the first wiring layer, a first via formed in a first recess having a first depth, the first via being in contact with the first wiring pattern, and a second via formed in a second recess having a second depth that is smaller than the first depth, the second via being in contact with the second wiring pattern.
Abstract:
A wiring substrate includes an insulation layer including a thermosetting resin and a reinforcement member having plural first fiber bundles and plural second fiber bundles woven together, the second fiber bundles being intersected with the first fiber bundles, and a pair of differential wirings arranged alongside each other on the insulation layer. The first fiber bundles and the second fiber bundles have a curved portion relative to a plan direction of the insulation layer in a region on which the pair of differential wirings is arranged.
Abstract:
A wiring substrate includes differential wirings; a first insulating layer adjacent to one side of the differential wirings, including first fiber bundles parallel to the differential wirings; a second insulating layer adjacent to another side of the differential wirings, including second fiber bundles parallel to the differential wirings and disposed by the same pitch as the first fiber bundles; a third insulating layer on the first insulating layer on a side opposite to the differential wirings, including third fiber bundles in parallel to the differential wirings; and a fourth insulating layer on the second insulating layer on a side opposite to the differential wirings, including fourth fiber bundles in parallel to the differential wirings. Intervals of the third and fourth fiber bundles are respectively narrower than intervals of the first and second fiber bundles. The differential wirings are disposed between adjacent first fiber bundles, and between adjacent second fiber bundles.
Abstract:
A printed wiring board manufacturing method includes weaving a glass fiber cloth with warp and weft yarns such that the warp and weft yarns are visually distinguishable at least a region. The glass fiber cloth is impregnated with a resin to fabricate a substrate. A copper foil is formed on at least one surface of the substrate to fabricate a core substrate. The copper foil is removed within the region on the core substrate to form an opening. A pitch between the warp yarns or between the weft yarns which are presented in the opening is detected. A pitch between a pair of differential wirings to be patterned is determined based on the detected pitch between the warp yarns or between the weft yarns. The pair of differential wirings is patterned on the core substrate in accordance with the determined pitch between the pair of differential wirings.
Abstract:
A multilayer wiring board is manufactured by preparing a first wiring board, a second wiring board, and a joint sheet. The first wiring board is provided with a via having a first through-hole in which a conductive film is formed. The second wiring board is provided with a second through-hole at a position substantially matching the position of the first through-hole. The joint sheet is provided with a third through-hole at a position substantially matching the positions of the first and the second through-holes. the first wiring board and the second wiring board are stacked and bonded together by heat and pressure with the joint sheet interposed therebetween.