摘要:
A varistor having a favorable heat-dissipating property is provided.In the varistor, a composite part having a favorable heat-dissipating property formed by a composite material composed of ZnO and Ag is arranged between main faces of a varistor matrix. Therefore, the heat transmitted from a semiconductor light-emitting device to a varistor part through an outer electrode can rapidly be transferred toward a main face on the opposite side through the composite part. In this varistor, side faces excluding inner side faces are exposed at side faces of the varistor matrix. Such a structure yields a favorable heat-dissipating property.
摘要:
In a varistor, a heat radiating portion contains the same components as ZnO that is the main component of a varistor element body, as metal oxides, thereby, the structural components of the varistor element body and the heat radiating portion are caused to be common. During firing, Ag contained in the heat radiating portion diffuses into the grain boundaries of ZnO, near the interface between surfaces of the heat radiating portion and the varistor element body. Consequently, in the varistor, cracks hardly occur between the varistor portion and the heat radiating portion during firing (or during binder removal), thereby, ensuring sufficient bonding strength between the varistor portion and the heat radiating portion. Therefore, heat conducted to the varistor portion is radiated efficiently conducting through electrically conducted paths formed in the heat radiating portion from the surface facing the varistor element body to other three surfaces of the heat radiating portion.
摘要:
An aggregate substrate has a first varistor part, a second varistor part, and a heat dissipation layer The first varistor part includes a first varistor element layer to exhibit nonlinear voltage-current characteristics, and a plurality of first internal electrodes juxtaposed in the first varistor element layer. The second varistor part includes a second varistor element layer to exhibit nonlinear voltage-current characteristics, and a plurality of second internal electrodes juxtaposed in the second varistor element layer The heat dissipation layer is located between the first and second varistor parts and is in contact with the first and second varistor parts.
摘要:
A multilayer chip varistor is provided as one capable of suppressing production of cracks and thereby preventing a connection failure between an internal electrode and a through-hole conductor. An internal electrode 21 is so configured as to be curved toward a direction of penetration of a through hole 10 in a connection portion 28 thereof to a through-hole conductor 27. By this configuration, a region T sandwiched between a curved surface 28a of the connection portion 28 and the through-hole conductor 27 is formed in a varistor layer 9 near the connection portion 28. In this region T, a metal concentration thereof becomes higher because of diffusion of metal of the internal electrode 21 and the through-hole conductor 27 into the varistor layer 9, and therefore, after completion of firing, the region T has an intermediate contraction percentage between that of the internal electrode 21 and through-hole conductor 27 and that of the other region of the varistor layer 9. This permits the region T to relax stress near the connection portion 28 where the internal electrode 21, through-hole conductor 27, and varistor layer 9 are congested so as to readily produce cracks.
摘要:
A multilayer chip varistor is provided as one having excellent heat radiation performance. A thickness between a first principal face 3 and an outermost internal electrode layer 11A is smaller than a thickness between an internal electrode layer 21 and the outermost internal electrode layer 11A, and because of this configuration, heat generated from a bottom face of a semiconductor light emitting device LE1 is efficiently transferred to the outermost internal electrode layer 11A having a high thermal conductivity. Furthermore, in the multilayer chip varistor V1 of an electronic component EC1, the outermost internal electrode layer 11A has a first internal electrode 13 electrically connected to a first connection electrode 7 and a first terminal electrode 5 through first through-hole conductors 17, and a second internal electrode 15 electrically connected to a second connection electrode 8 and a second terminal electrode 6 through second through-hole conductors 27. Because of this configuration, heat H generated from the semiconductor light emitting device LE1 is transferred to both the first internal electrode 13 and the second internal electrode 15, so as to be transferred to the first through-hole conductors 17 and the second through-hole conductors 27. This leads to well-balanced transfer of heat to the first through-hole conductors 17 and the second through-hole conductors 27.
摘要:
The electrostatic protection device in accordance with the present invention is the electrostatic protection device for protecting a plurality of electronic elements electrically connected in series against static electricity, the device comprising a plurality of first electrostatic protection elements having a current-voltage nonlinear resistance characteristic, a plurality of second electrostatic protection elements having a current-voltage nonlinear resistance characteristic, and a ground terminal for electrically connecting with a ground. The plurality of first electrostatic protection elements are electrically connected in parallel to the respective electronic elements, while the plurality of second electrostatic protection elements are electrically connected between input terminals of the respective electronic elements and the ground terminal.
摘要:
A sealing device in which a main seal lip used for a shock absorber is formed in a one-stage structure, wherein lattice-shaped projections that include a plurality of projections extending along a sliding direction and a plurality of projections extending along a direction perpendicular to the sliding direction are formed on a sliding surface of the main lip at a position apart a specified distance from a lip edge.
摘要:
A meter device includes an indicator unit, movably supported within a predetermined range, for representing an amplitude value of an input signal by a movement amount Δθ from a reference position θ0 which is one end of the predetermined range. A gain acquiring unit acquire a gain of the input signal; and a maximum movement amount determining part determines a maximum movement amount ΔθM of the indicator unit at the gain based on the gain acquired by the gain acquiring unit. A drive control unit moves the indicator unit to a position corresponding to the amplitude value of the input signal between the reference position θ0 and a maximum movement position θM moved from the reference position θ0 by the maximum movement amount ΔθM based on the maximum movement amount ΔθM determined by the maximum movement amount determining part and the amplitude value of the input signal.
摘要:
In a motor stator structure, a neutral-point bus ring is arranged along an inner peripheral portion of a stator, and alternately includes a larger-diameter portion, a first link portion, a smaller-diameter portion, and a second link portion. An end of a wound wire pulled out of a coil is located between radially-extending adjacent first and second link portions. A connecting terminal is connected at one end to the end of the wound wire, and at the other end to the first and second link portions. The use of the neutral-point bus ring ensures that a neutral point can be formed without bending the end of the wound wire of the coil into a U-shape. Particularly when a rectangular cross-section wire difficult to bend is used as the wound wire, the processing cost can be reduced.
摘要:
The invention prevents a temperature in an end portion of a stator iron core from becoming excessively high due to a heat generated in the end portion of the stator iron core of a turbine generator. In a dynamo-electric machine provided with a stator constituted by a stator iron core, a stator iron core pressing member and a stator coil, a rotor constituted by a rotor iron core, a rotor coil and a holding ring, and a baffle plate arranged in an inner diameter side of an end portion of the stator iron core and distributing a cooling medium cooling an inner side of the machine, the baffle plate is provided for forming a flow of the cooling medium along an inner periphery of the stator iron core pressing member and/or an inner peripheral surface of the end portion of the stator iron core.