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42results about How to "High thermal conductivity material" patented technology

High average-power microwave window with high thermal conductivity dielectric strips

A high average-power microwave window is provided whose thermal conductivity has been enhanced to enable it to transmit higher average RF power levels than conventional windows of the same size. Such a window is suitable for use with high-average power RF sources such as klystrons and magnetrons. The window comprises a ceramic substrate, typically a low-loss ceramic such as alumina or quartz, to which narrow strips of a high thermal conductivity material have been bonded. One such high thermal conductivity material is synthetic polycrystalline diamond, which can be bonded to the surface of a dielectric substrate using a high-temperature cement or can be directly deposited on the surface by a process such as chemical vapor deposition (CVD). High-purity alumina, a commonly-used material for high-power RF windows, has a thermal conductivity of 26.4 W / mx DEG C., while synthetic diamond has a thermal conductivity of 1000 W / mx DEG C., 2.6 times that of copper and 38 times that of alumina. The novel feature is the use of high thermal conductivity strips to increase the effective thermal conductivity of a microwave window by providing low-resistance paths by which heat can be extracted from the window, resulting in a significant increase in the window's power-handling capacity.
Owner:CROUCH DAVID D

Highly integrated high light efficiency thermoelectric separation power type light emitting diode (LED) and encapsulating method thereof

InactiveCN102646673ASolve the problem of generally low light efficiencyHigh light efficiencySolid-state devicesSemiconductor devicesElectricityHeat conducting
The invention discloses a highly integrated high light efficiency thermoelectric separation power type light emitting diode (LED). The LED comprises a paster type bracket, an LED chip and gold threads, wherein a concave cup is formed on the upper surface of the bracket, electric conducting channels which are independently communicated into two sides of the concave cup are arranged at left and right sides of the bracket, the bottom surface of the bracket is provided with a heat conducting channel of which the middle part is communicated to the middle part of the concave cup, the LED chip is stuck with the heat conducting channel through heat conducting insulation paste, two poles of the LED chip are respectively electrically connected with the electric conducting channel through the gold threads, and a fluorescent colloid which is formed by mixing silica gel and fluorescent powder is filled and sealed in the concave cup. Because of the design of thermoelectric separation, heat dissipated when the LED chip works can be independently conducted to a heat dissipating pillar in time, and the impacts of heat on the reliability of second spot welding and the service life of the chip are reduced. With the design of polycrystal serial and parallel integration and thermoelectric separation, the LED disclosed by the invention has the technical effects of high light efficiency, independent heat and electric channels, simple structure, good heat dissipation effect and the like.
Owner:OUTRACE TECH
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