Light-emitting diode (LED) bulb

Abstract

A light-emitting diode (LED) bulb comprises a light-permeable bulb shell, an LED luminous source, a stem, a driver and an electric connector, wherein the stem is provided with a support pillar, a horn tube, an exhaust tube and electric lead wires; the bulb shell and the stem are sealed in a vacuum mode, and low-viscosity high-thermal-conductivity gas is filled in the bulb shell; the LED luminous source is composed of at least one transparent LED light-emitting column; the LED light-emitting column comprises a high-thermal-conductivity transparent tube inserted in the outer surface of the support pillar; at least one string of LED chips and a luminescent powder layer are arranged on the surface of the transparent tube; the chips are in series connection or in series-parallel connection, electric lead wires of chip electrodes are connected with the electric lead wires of the stem, a stem electrical connection wire is connected with the output end of the driver, the input end of the driver is connected with the electric connector, and the electric connector is communicated with an external alternating current (AC) or direct current (DC) power supply. The LED bulb has the advantages that thermal resistance between the LED chips and the heat dissipation gas is low, heat dissipation effect is good, an LED bulb with higher luminous flux and higher luminous efficiency can be manufactured, the light-emitting component is firmly fixed, can withstand strong shock, and is high in reliability, and the LED bulb is simple in manufacturing process and low in cost.

Description

technical field [0001] The invention relates to an LED light bulb, in particular to a LED bulb with high reliability, high luminous efficiency, high output luminous flux, similar shape to an incandescent lamp, no heavy metal heat sink, simple manufacturing process, low cost, long life and low weight. Light LED bulbs. It can replace incandescent lamps, fluorescent energy-saving lamps, etc. for lighting. Background technique [0002] The LED light bulb mentioned here refers to the LED light bulb whose shape, size and distribution of emitted light are similar to ordinary incandescent light bulbs. [0003] Most of the LED light bulbs of the prior art use discrete LED components, such as surface mount (SMD), in-line LEDs, straw hat LEDs, etc., to be installed on PCB or metal-based PCB (MPCB), and then made into incandescent bulb-shaped LED bulbs; Corn lamp, a bulb with a bulb shell, multiple SMD LEDs and its PCB in the center of the bulb shell; for example, Chinese patent 02202...

AI Technical Summary

Problems solved by technology

Among them, corn lamps are large in size, with exposed LEDs, poor safety and lifespan; lamps with bulbs using SMD LEDs and PCBs have low power and low luminous efficiency, generally about 60lm / W

[0004] Another kind of LED light bulb in the prior art uses LED chip 4π light-emitting strips as light source, and has high luminous efficiency, such as Chinese patents 201010278760.0 and 201010610092.7; the existing LED light source of this type of lamp uses several discrete 4π light-emitting strips The LED light-emitting strip is assembled by spot welding. The light-emitting strip is sealed in a vacuum-sealed bulb filled with a low-viscosity high-thermal-conductivity gas, such as helium. The heat generated by the LED is passed through the gas Convection and conduction, and then dissipate through the bulb; the luminous efficiency of this type of lamp can be as high as 160lm / W or more, but the contact area between the luminous strip and the gas, that is, the heat conduction area is small, and it is difficult to manufacture a high temperature lamp with a high temperature of 1000lm or more. Brightness LED bulbs are not resistant to strong vibrations, and there are many solder joints for assembly spot welding, which affects cost and reliability

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