Abstract:
A ceramic substrate includes a ceramic layer mainly formed of a glass ceramic and a conductor trace mainly formed of silver (Ag). In an adjacent region located adjacent to the conductor trace, the concentration of boron atoms (B) contained in the ceramic layer increases toward the conductor trace.
Abstract:
A substrate for a light-emitting diode comprising a metal base with a thickness of a predetermined value or more is constituted so that the thickness of a top conductor for an electrical connection with a light-emitting diode (LED) in a predetermined range falls within a predetermined range and the thickness of an insulation layer which electrically insulates the metal base and the top conductor and the thickness of the top conductor meet a predetermined relation. Thereby, a substrate for a light-emitting diode which can show a high heat dissipation capacity by achieving a low thermal resistance as the total thermal resistance of the whole substrate without reducing an insulation reliability and high-humidity reliability of the substrate is provided.
Abstract:
In a glass-ceramics composite comprising a glass phase and a crystalline phase which contains an oxide system ceramics dispersed in the glass phase, by making the composition of material which forms the glass phase meet specific conditions, the thermal conductivity of the glass-ceramics composite which is obtained by firing the glass phase and the crystalline phase is raised. Thereby, a glass-ceramics composite which is suitable for a low-temperature firing use and has a high thermal conductivity is provided.
Abstract:
The present invention is directed toward a via fill material for use in solar applications that exhibits low series resistance and high shunt resistance. The via fill material according to the invention includes silver powder, a glass frit and a vehicle.
Abstract:
[Object] To provide a circuit board having good heat dissipation characteristics capable of promptly dissipating the heat generated by a metal wiring layer on the basis of operations of an electronic component and exhibiting high reliability enabling a long term of use by improving the adhesion strength between a ceramic sintered body and a metal wiring layer and, thereby, reducing peeling of the metal wiring layer due to cooling/heating cycles when operation and non-operation of the electronic component are repeated, and an electronic apparatus in which an electronic component is mounted on the circuit board. [Solution] A circuit board is provided with a metal wiring layer 12 on at least one principal surface of a ceramic sintered body 11, wherein the above-described metal wiring layer includes a first region 12a which is in contact with the principal surface and which contains a glass component and a second region 12b which is located on the first region 12a and which does not contain a glass component, the thickness of the first region 12a is 35% or more and 70% or less of the thickness of the metal wiring layer 12, and the average grain size in the first region 12b is smaller than the average grain size in the second region 12b.
Abstract:
A composition for forming transition vias and transition line conductors is disclosed for minimizing interface effects at electrical connections between dissimilar metal compositions. The composition has (a) inorganic components selected from the group consisting of (i) 20-45 wt% gold and 80-55 wt% silver and (ii) 100 wt% silver-gold solid solution alloys, and (b) an organic medium. The composition may also contain (c) 1-5 wt%, based upon the weight of the composition, of oxides or mixed oxides of metals selected from the group consisting of Cu, Co, Mg and Al and/or high viscosity glasses mainly containing refractory oxides. The composition may be used as a multi-layer composition in a via fill. Multi-layer circuits such as LTCC circuits and devices may also be formed using the composition for forming transition vias and transition line conductors.
Abstract:
A process for the production of formed ceramic bodies which can dispense with the step of removing a restraining layer after the completion of firing to simplify the production process and to inhibit a fired ceramic body from being damaged in the restraining layer removing step and which makes it possible to produce formed ceramic bodies (such as ceramic substrates) having high dimensional accuracy in a high yield. The process comprises using as the restraining layer (31) a restraining layer mainly made of a fire-destroyable material which can be burnt down under a high oxygen partial pressure though it is not burnt down in a low-oxygen atmosphere, setting the restraining layer (31) on at least one principal surface of a base material layer (A') to be fired into a ceramic substrate (formed ceramic body), subjecting the base material layer (A') with the restraining layer (31) to the first firing step (firing under restraint) in a low-oxygen atmosphere to sinter the base material layer (A'), and then subjecting the resulting system to the second firing step under the condition of an oxygen partial pressure higher than that of the first firing step to burn down the restraining layer (31), and thus can dispense with the step of removing the restraining layer (31).
Abstract:
An embedded resistor and capacitor circuit and fabrication method is provided. The circuit includes a substrate, a conductive foil laminated to the substrate, and a thick film dielectric material disposed on the conductive foil. One or more thick film electrodes are formed on the dielectric material and a thick film resistor is formed at least partially contacting the thick film electrodes. A capacitor is formed by an electrode and the conductive foil. The electrodes serve as terminations for the resistor and capacitor.