High-radiation LED filament

Abstract

The invention provides a high-radiation LED filament. The high-radiation LED filament comprises a heat conduction substrate, a plurality of LED lamps connected in series are fixed on a first surface of the heat conduction substrate, a high-radiation material layer is formed on a second surface opposite to the first surface, and the high-radiation material layer and the second surface are connectedin a chemical bond manner. According to the high-radiation LED filament, an exposed surface of the heat conduction substrate forms the surface layers connected with the heat conduction substrate in the chemical bond manner through machining or the chemical and physical mode process, the surface layers have high heat radiation coefficients, the heat radiation becomes an effective heat radiation approach of the LED filament, the heat radiation capability of the filament is improved, and the filament is applicable to practical application of higher power.

Description

technical field [0001] The invention relates to the technical field of LED lighting, in particular to a high-radiation LED filament. Background technique [0002] The basic form of the current filament light source is to package dozens of LEDs in series on a long heat-conducting substrate. The material of the heat-conducting substrate is generally transparent ceramic or opaque metal. When using transparent ceramics as the heat-conducting substrate, blue light For the leakage problem, the phosphor type must be determined according to the required color temperature parameters of the LED and the chip band, and then mixed with silica gel or acrylic resin to form a light yellow fluorescent glue, and the phosphor glue is applied to the integrated soldered LED blue light chip , which directly converts blue light to white light. Install the prepared LED filament on a copper wire support, and place it together in a transparent or translucent sealed bulb (usually glass) filled with a...

AI Technical Summary

Problems solved by technology

However, the thermal radiation coefficient of the smooth silver coating is very small, and the surface thermal radiation coefficient (emissivity) is defined as the highest 1, and the worst is 0, then the thermal radiation coefficient of the smooth silver coating is only 0.02-0.05, which leads to the radiation of the thermally conductive substrate. very poor ability

Therefore, the thermal radiation and heat dissipation ability of the metal-based filament is also very poor at present. Although the back of the metal-based filament has a large radiation area, its radiation heat dissipation contributes little to the heat dissipation of the filament lamp system.

[0008] In addition, the heat dissipation performance of the LED filament can also be improved by increasing the radiation surface area of ​​the bulb (using a large bulb) or increasing the surface area of ​​the LED filament to increase the probability of gas molecule collisions (thickening the filament), but the effect is not good. ideal

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