摘要:
The circuit board is capable of tightly bonding a cable layer on a base member even if thermal expansion coefficients of the base member and the cable layer are significantly different. The circuit board comprises: the base member; and the cable layer being laminated on the base member with anchor patterns, which are electrically conductive layers formed on a surface of the base member.
摘要:
The core member constitutes a core substrate of a circuit board. The core member comprises: a carbon fiber-reinforced core section, in which prepregs including carbon fibers are thermocompression-bonded; and copper foils being respectively thermocompression-bonded on the both side faces of the carbon fiber-reinforced core section with prepregs including glass fibers. The pregregs including glass fibers are composed of resin, whose melting temperature range is higher than that of resin composing the pregregs including carbon fibers.
摘要:
The core layer of a core substrate is made of carbon fibers impregnated with resin. When the temperature of the core layer increases, the core layer suffers from an increase in the thickness because of thermal expansion of the resin. The core layer is sandwiched between the insulating layers containing glass fibers. The insulating layers serve to suppress an increase in the thickness of the core layer resulting from the thermal expansion of the core layer. Thermal stress is suppressed in the core substrate.
摘要:
Large-sized through holes are formed in a core layer of a printed wiring board. Large-sized vias are formed in the shape of a cylinder along the inward wall surfaces of the large-sized through holes located within a specific area. A filling material fills the inner space of the large-sized via. A small-sized through hole penetrates through the corresponding filling material along the longitudinal axis of the small-sized through hole. A small-sized via is formed in the shape of a cylinder along the inward wall surface of the small-sized through hole. The filling material and the core layer are uniformly distributed within the specific area in the in-plane direction of the core substrate. This results in suppression of uneven distribution of thermal stress in the core layer in the in-plane direction of the core layer.
摘要:
A printed circuit board includes a first insulation layer that is formed of a resin material into which fiber cloth is embedded. A second insulation layer is formed of a resin material, and is stacked on a front surface of the first insulation layer on which a heating process has been performed. A conductive land is formed on a front surface of the second insulation layer. A via is provided in a through hole penetrating through the first insulation layer and the second insulation layer. The through hole is filled with a conductive material, and the via is connected to the conductive land.
摘要:
A printed wiring board including a substrate that includes wiring through-hole portions where wiring through-holes which each penetrate the substrate from a surface on a front side of the substrate to a surface on a back side of the substrate, the wiring through-hole portions being made using a dielectric material having a thermal expansion coefficient different from a thermal expansion coefficient of the substrate; and thermal-expansion adjusting portions produced by filling prepared-holes with the dielectric material, the prepared-holes being produced at a surface of the substrate. The surface is partitioned into predetermined blocks, in each of which the thermal-expansion adjusting portions are placed in a layout that minimizes a difference between a thermal expansion coefficient in the block in a length direction and a thermal expansion coefficient in the block in a width direction according to a placement of the wiring through-hole portions in the block.
摘要:
A condition monitoring apparatus determines whether an occupant is present in a passenger compartment based on a detection signal from a seat sensor, and detects the carbon dioxide concentration Cx in the passenger compartment based on a detection signal from a carbon dioxide sensor. When the ignition switch is OFF and an occupant is present in the passenger compartment, the condition monitoring apparatus determines whether the carbon dioxide concentration Cx is greater than a determination threshold value C1 for carbon dioxide concentration. The apparatus activates an alarm when the carbon dioxide concentration Cx is greater than the threshold value C1.
摘要:
A crosslinkable rubber composition includes, as essential components: (A) an ethylene-α-olefin-nonconjugated polyene random copolymer rubber in which the nonconjugated polyene has a terminal vinyl group-containing norbornene compound represented by the following general formula (1) or (II), wherein n is an integer of 0 to 10, R1 is H or an alkyl group, and R2 is H or an alkyl group, wherein R3 is H or an alkyl group, and which has a viscosity of not less than 10 Pa·s and less than 1,000 Pa·s at 25° C. under a shear rate of 10 s−1; (B) an organopolysiloxane which has three repeating units of siloxane represented by the following formula and which has three Si-bonded hydrogen atoms per molecule, wherein R4 is a monovalent hydrocarbon group; (C) a reinforcing filler; (D) a curing catalyst; and (E) a curing reaction retarder.