LED filament and manufacturing method thereof and LED bulb lamp applying filament

Abstract

An LED bulb lamp comprises a lamp shell, a lamp head connected with the lamp shell, a core column, conductive supports, LED filaments and cantilever arms, wherein the core column comprises a core column bottom and a core column top which are opposite to each other, the core column bottom is connected with the lamp head, and the conductive supports are connected with the core column top. Each LED filament comprises a filament body and filament electrodes, wherein the filament electrodes are located at the two opposite ends of the filament body, the two filament electrodes are connected with the two conductive supports, the core column is surrounded by the filament bodies, one end of each cantilever arm is connected with the core column, and the other end of each cantilever arm is connected with the corresponding filament body. In the height direction, the distance from the bottom of the lamp shell to the top end of the lamp shell is H, a first height difference ranging from 0 to 1 / 10H exists between every two corresponding filament electrodes, each filament body is bent up and down and has a highest point and a lowest point, a second height difference exists between the highest point and the lowest point, the first height difference is smaller than the second height difference, and the second height difference ranges from 2 / 10H to 4 / 10H. The LED bulb lamp is good in glowing effect, easy to make and large in light emergent angle.

Description

technical field [0001] The invention relates to the field of lighting, in particular to an LED filament, a manufacturing method thereof, and an LED bulb lamp using the LED filament. Background technique [0002] LED has the advantages of environmental protection, energy saving, high efficiency and long life, so it has been widely valued in recent years and has gradually replaced the status of traditional lighting fixtures. However, the light emitted by traditional LED light sources is directional, unlike traditional lamps that can illuminate with a large and wide-angle range. Therefore, applying LEDs to traditional lamps has corresponding challenges depending on the type of lamp. [0003] In recent years, an LED filament that can make LED light sources emit light similar to traditional tungsten bulbs and achieve 360° full-angle lighting has attracted increasing attention from the industry. The production of this LED filament is to connect multiple LED chips in series and fi...

AI Technical Summary

Problems solved by technology

However, the soft filament made of FPC has disadvantages such as the thermal expansion coefficient of FPC is different from that of the silica gel covering the filament, long-term use will lead to displacement or even degumming of the LED chip; or FPC is not conducive to flexible changes in process conditions, etc.

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