[0024] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.
[0025] The large-angle full-peripheral LED bulb of the present invention is composed of a sealed light-emitting bulb 1, a sealing portion 11 for sealing the bottom opening of the sealed light-emitting bulb, a light-emitting module 2 and a lamp cap connected to the bottom of the sealing portion. Group 2 is a strip-shaped LED omnidirectional filament 7, which is vertically installed above the sealing part, and a trachea (13) is arranged in the sealing part. The strip-shaped LED omnidirectional filament 7 is connected to the power lead 4 of the sealing part through a connecting wire. The inside of the sealed light-emitting bulb is filled with a heat-dissipating protective gas 12, and the heat-dissipating protective gas (12) is hydrogen or inert gas or a mixture of the two.
[0026] The lamp holder is used to connect to mains or other power sources. The bar-shaped LED filament is an LED bar-shaped light source with omni-directional light output. The external power lead passes through the sealing part and forms two contacts above the sealing part. The strip-shaped LED is omnidirectional The positive and negative poles of the filament are connected to the two contacts through the connecting wires. When installing, the light-emitting module and the sealing part are integrated into the sealed light-emitting bulb, and the exhaust pipe is used to fill the heat dissipation protective gas inward while squeezing the internal air The inside of the bulb is filled with a heat-dissipating protective gas with a certain pressure. The heat-dissipating protective gas can be an inert gas with low viscosity and high thermal conductivity. Because hydrogen has excellent thermal conductivity, hydrogen can also be selected as the heat-conducting gas, but because hydrogen belongs to Explosive gas greatly increases safety costs during production and use. Therefore, you can choose to use a mixture of hydrogen and inert gas. The preferred inert gas is helium. The molecular weight of helium is the closest to hydrogen, and the mass density of the two is similar when mixed. The mixing is more uniform and the best heat conduction effect can be achieved. Experiments have shown that when the proportion of hydrogen is 5%, a better heat dissipation curve can be obtained. If the proportion of hydrogen is increased, the heat dissipation effect is not obvious, but the danger is increased. The purity of hydrogen, helium or other inert gases can be selected as ordinary 99.999%. The pressure drop of the heat-dissipating protective gas is generally close to the atmospheric pressure. In order to prevent external air from permeating and oxidizing, it can be set at a pressure value slightly higher than the atmospheric pressure of 1.1-1.5 MPa. The model of the sealed light-emitting blister can be A type blister, G type blister, P type blister, B type blister, C type blister, T type blister, etc.; the lamp holder model can be E type, B type Type, GU type, GX type, GZ type, etc.
[0027] The invention uses the omnidirectional LED filament as the light source, obtains a large angle and good uniformity of light output range, uses gas as the heat-conducting medium, solves the problem of large luminous heat of the omnidirectional LED filament, saves the bulky heat dissipation device, and has a light structure. Reduce production costs and overcome potential safety hazards.
[0028] Another embodiment of the present invention that uses multiple omnidirectional filaments is given below. In this embodiment, the large-angle full-peripheral LED bulb further includes a stem 3, which is vertically installed above the sealing portion The light-emitting module includes a plurality of strip-shaped LED omnidirectional filaments 7, a first connecting wire 8 is fixed on the top of the stem, and the first connecting wire is also connected to the upper end of the strip-shaped LED omnidirectional filament 7, The lower end of the strip-shaped LED omnidirectional filament is also connected with a second connecting wire, which is connected to the power lead contact of the sealing part through the second connecting wire; the plurality of strip-shaped LED omnidirectional filaments are symmetrically distributed around the central axis of the stem 3 , And the angle between each strip-shaped LED omnidirectional filament and the central axis of the stem is an acute angle.
[0029] The stem is fixed above the sealing part to support each strip-shaped LED omnidirectional filament. The stem is usually made of ceramic material. In order to facilitate the fixed connection between the top of the stem and each filament, a fixed connection inside the stem can be installed on the top of the stem. The metal contact 9, the metal contact can be a metal wire or a metal cylinder, the first connecting wire is welded to the metal contact, and the metal contact can be one or more to insulate the tops of the filaments from each other. The second connecting wire is connected between the bottom of the filament and the power lead contact. Those skilled in the art can realize that each filament is connected to two power sources through the first connecting wire and the second connecting wire, for example, by using a star or radial connection. A current loop is formed between the lead contacts. The luminous brightness of the LED is proportional to the size of the current flowing through the LED. In order to obtain uniform luminous brightness, a series connection method can be used. However, the risk caused by the series method is that any one LED is disconnected and all LEDs will not emit light. For four or four More than one bar-shaped LED omnidirectional filament can be connected in a series-parallel hybrid form through connecting wires. For example, for four filaments, you can connect them in series and then in parallel. The two filaments connected in series in the same branch form a symmetrical spatial distribution, which weakens the visual effect of uneven brightness caused by different currents in the two parallel branches. .
[0030] When the angle between the filament and the central axis of the stem increases, higher brightness and uniformity of illumination can be obtained on the front of the lamp, but the increase in the angle is not conducive to assembly. In practical applications, the opening size of the bulb limits the luminous mold The projected cross-sectional area of the group, for example figure 1 with image 3 In the two specific embodiments, the size of the opening of the sealed light-emitting bulb is smaller than the cross-sectional area of the body of the bulb. When the angle between the filament and the stem increases, the size of each filament at the farthest distance from the stem increases. During the assembly process, it is necessary to pre-assemble the filament and stem into a complete light-emitting module and then put it inside the blister. Therefore, the maximum projected area of the light-emitting module should be smaller than the size of the opening of the blister. Therefore, usually the filament and stem The included angle of the central axis is limited to the range of 10-55 degrees.
[0031] For example to figure 1 The A60-type blister in A60 adopts a sealed light-emitting blister with a built-in four strip-shaped LED omnidirectional filaments, the filaments and the central axis of the stem are at an angle of 18°, and the lamp holder model is E27. The weight of the candle bulb is 42g, the light-emitting angle reaches 300 degrees, and the light distribution curve is like figure 2 Shown. The position where the brightness is zero is the front and back of the lamp.
[0032] image 3 In the embodiment, the model of the sealed light-emitting bulb is B35 type bulb, and two strip-shaped LED omnidirectional filaments are built in, and the filament and the central axis of the stem are at an angle of 13°, and the lamp holder model is E27. The weight of the candle bulb is 30g, the light-emitting angle reaches 300 degrees, and the light distribution curve is like Figure 4 Shown.
[0033] Generally, the lead contacts that extend from the sealing part to connect to the external power supply are metal wires with a certain mechanical strength. When only two strip-shaped LED omnidirectional filaments are used, the two power lead contacts of the sealing part can be used directly As the lower support of the filament, the current loop connection is realized while being supported. For the case of more than three filaments, a radial bracket 10 may be provided at the bottom of the core column, the radial bracket has a plurality of extension legs, the middle of the radial bracket has a fixing ring, and the fixing ring is sleeved on the core. Below column 3. For example figure 1 In the embodiment, the lamp has four filaments, and a stainless steel wire can be bent into a shape like a spring. The hollow in the middle of the spring is the fixed ring, which is sleeved under the stem, and the two free ends of the wire are facing Two extension legs are formed outside to support two filaments, and the other two filaments can still be supported by the power lead contacts. It is also possible to make a preform with a metal ring in the middle, and a plurality of outwardly extending metal wires are welded on the outside of the metal ring as extension legs, and the metal ring is sleeved on the bottom of the core column.
[0034] The driver 6 used to drive the LED filament can be fixed inside the lamp cap by potting glue, or a hollow sleeve can be added between the sealing part 11 and the lamp cap 5, and the driver 6 can be placed in the hollow sleeve. This method is suitable for containing For drivers with large volume or heat generation, the hollow sleeve can be a plastic or metal shell.
[0035] The foregoing are the various preferred embodiments of the present invention. If the preferred embodiments in each preferred embodiment are not obviously contradictory or are based on a certain preferred embodiment, each preferred embodiment can be used in any combination. The examples and the specific parameters in the examples are only to clearly express the inventor’s invention verification process, not to limit the scope of patent protection of the present invention. The scope of patent protection of the present invention is still subject to its claims. The equivalent structural changes made in the content of the description and drawings of the present invention should also be included in the protection scope of the present invention.
