Welding structure of a color-tunable filament and a color-tunable bulb

Abstract

The present application relates to the technical field of LED bulb, in particular to a welding structure of a color adjustable filament, which comprises a single-end power supply color adjustable LED filament and a plurality of outer filaments fixed on a sintering head of a horn tube, the end of the outer filament extends a distance from the sintering head, and further comprises a set of rigid conductors, one end of the set of rigid conductors is welded with the extending end of the outer filament one by one, and the other end is welded with the positive and negative electrode contacts of the end of the LED filament one by one. The middle section of the set of rigid conductors is fixed by an insulating restraint and kept a certain distance apart. The present application also relates to a color adjustable bulb, which comprises a glass bulb, a horn tube sintered at the tail end of the glass bulb, a lamp cap fixed at the tail end of the glass bulb, and a driving module installed in the lamp cap, the glass bulb is filled with inert gas, and further comprises the welding structure of the color adjustable filament, the other end of the outer filament is connected with the driving module.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of LED bulb, in particular to a welding structure of a color-adjustable filament and a color-adjustable bulb. BACKGROUND

[0002] The color-adjustable bulb refers to a bulb that realizes multi-color light emission through a single filament or multiple filaments. The current mainstream technology route is a simple and compact single-filament structure, such as a common three-color RGB / four-color RGBW bulb. The filament is internally integrated with multiple LED light-emitting lines, and different light-emitting lines are responsible for emitting different colors of light.

[0003] In the existing color-adjustable bulb, a single filament is basically divided into two modes of double-end power supply and single-end power supply according to the distribution of its positive and negative poles. Single-end power supply means that the positive and negative poles are located at the same end of the base plate, the external wiring is relatively convenient, and the appearance is also relatively beautiful. For example, a single-end power supply filament bulb provided by Chinese Utility Model Patent 202021537557.6 adopts a single-end power supply filament, and the positive and negative pole contacts are directly inserted into the plug hole for electricity conduction. The above plug-in structure is easy to install, but it is only suitable for a plastic bubble shell structure, and the plastic bubble shell and the lamp holder are usually assembled by a buckle / screw joint process. The bubble shell is not airtight, and therefore cannot be filled with inert gas for protection. The filament is directly exposed to the external air, and the moisture and other components in the air may cause the surface of the metal wire to be corroded and deteriorated, which may easily lead to lamp failure over time. The power and light efficiency level is also limited, usually not higher than 3W power and 110 LM / W light efficiency.

[0004] Therefore, the applicant proposes that the color-adjustable bulb adopts a glass bubble shell similar to an incandescent lamp, fills the bubble shell with inert gas to protect and assist in heat dissipation of the filament, reduces the probability of lamp failure, and improves the power and light efficiency level. When a glass bubble shell structure is adopted, the positive and negative pole contacts of the single-end power supply filament need to be welded to the external wire (commonly used are Dumet wire, electrolytic copper wire, and nickel-plated iron wire) one by one, and then the relevant operation of sealing the bubble is performed. The following problems are found in the actual production process: (1) During the sealing process, the high temperature at the sintering position of the horn tube and the glass bubble shell is quickly transmitted to the welding position through the horn tube and the external wire, which may cause the solder of the positive and negative pole contacts to melt and cause disconnection with a certain probability; (2) In order to facilitate the welding of the positive and negative pole contacts of the filament, the external wire needs to be extended from the sintering head of the horn tube by a certain length, which can also avoid the filament being too close to the horn tube and being directly affected by the high temperature during the sealing process. Since the external wire is relatively soft in material, and the other end of the filament is also suspended, when the bulb is subjected to a lateral impact, the internal filament will swing, causing the external wire to be bent and unable to naturally return to the axial position of the bulb, which affects the aesthetic level and light emission effect of the bulb. The above problems remain to be solved. SUMMARY

[0005] The present application aims to overcome the deficiencies of the prior art, and provides a welding structure of a color-adjustable filament, which can reduce the disconnection of the positive and negative contacts of the filament, improve the impact resistance of the filament, and also provides a color-adjustable bulb.

[0006] The technical solutions adopted by the present application are as follows:

[0007] A welding structure of a color-adjustable filament, comprising a single-end powered color-adjustable LED filament, and a plurality of external filaments fixed on a sintering head of a horn tube, the end of the external filament extending from the sintering head by a distance, and a set of rigid conductors, one end of the set of rigid conductors being welded to the extending end of the external filament one by one, and the other end being welded to the positive and negative contacts of the end of the LED filament one by one.

[0008] As a preferred option, the middle section of the set of rigid conductors is fixed by an insulating restraint and kept a certain distance apart.

[0009] As a preferred option, the set of rigid conductors is a row of pins of a row pin connector.

[0010] As a preferred option, the color-adjustable LED filament comprises a substrate, a plurality of light-emitting lines for emitting different colors arranged on the substrate, and fluorescent glue attached to the front and back of the substrate and each light-emitting line.

[0011] As a preferred option, one pole of each light-emitting line is connected to a common end and extends to the end of the substrate, and the other pole of each light-emitting line extends to the end of the substrate where the common end is located, forming a single-end power supply structure.

[0012] Another technical solution of the present application is a color-adjustable bulb, comprising a glass bulb, a horn tube sintered at the tail end of the glass bulb, a lamp cap fixed at the tail end of the glass bulb, and a driving module installed in the lamp cap, the glass bulb being filled with inert gas, and further comprising the welding structure of the color-adjustable filament, the other end of the external filament being connected to the driving module.

[0013] As a preferred option, the color-adjustable LED filament is located at the axis of the glass bulb, and the non-powered end of the filament is arranged to overhang in the glass bulb.

[0014] The present application has the following advantages: (1) The present application uses the needle (rigid conductor) as the intermediate connecting piece of the outer wire and the positive / negative electrode contact of the filament, and adds a welding point between each outer wire and the positive / negative electrode contact of the adjustable color LED filament. On the premise of not affecting the conduction, the heat transfer speed can be reduced to a certain extent, and most of the heat at the welding point between the outer wire and the needle can be transferred to the needle, so that too much heat is not accumulated at this welding point. The heat of the needle is transferred to the welding point between the needle and the positive / negative electrode contact. After two times of heat transfer, the possibility of disconnection of the two welding points between the outer wire and the needle and the needle and the positive / negative electrode contact is reduced; (2) The length of the needle can keep the adjustable color LED filament and the sintering head of the horn tube at a distance, so that the distance of the end of the outer wire extending from the sintering head can be shortened. Since the needle is a rigid structure, it can be regarded as a whole rigid structure after being welded with the filament. Compared with the direct welding of the outer wire and the adjustable color LED filament, the center of gravity of the whole rigid structure is closer to the outer wire, so that the swing amplitude is smaller when impacted. The outer wire between the whole rigid structure and the sintering head is shorter, so that the bending resistance is stronger. Therefore, the ability to resist external impact can be improved, and the adjustable color LED filament can be reset after being impacted; (3) After the glass bulb is filled with inert gas, the inert gas can protect and assist in heat dissipation of the adjustable color LED filament which has a large amount of heat and integrates multiple LED light emitting lines. Therefore, the power of the adjustable color LED filament can be larger, and the light efficiency grade is higher. In actual production test, the adjustable color bulb provided by the present application can reach 10 W power and 135 LM / W light efficiency, and has superior performance. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic diagram of an embodiment of the present application.

[0016] Figure 2 is a center of gravity comparison diagram when the outer wire is directly welded with the adjustable color LED filament and the outer wire is welded with the adjustable color LED filament through the needle connector.

[0017] The reference signs: glass bulb 1, lamp cap 2, adjustable color LED filament 3, light emitting line 3.1, contact 3.2, rigid conductor 4, restraint 5, outer wire 6, sintering head 7, center of gravity A. DETAILED DESCRIPTION

[0018] In order for those skilled in the art to more clearly understand the purpose, technical scheme and advantages of the present application, the present application will be further described below in conjunction with the drawings and examples, but the present application is not limited to the following examples.

[0019] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0020] like Figure 1 As shown, this embodiment provides a welding structure for a color-tunable filament, including a single-ended power-supply color-tunable LED filament 3, and several external guide wires 6 embedded in the sintering head 7 of the bulb's horn tube. The edge of the horn tube is sintered at the tail end of the bulb's glass bulb 1. The ends of the external guide wires 6 extend a certain distance from the sintering head 7. It also includes a pin header connector, whose pins serve as a group of rigid conductors 4. The middle section of the rigid conductors 4 is fixed by the insulating constraint 5 of the pin header connector (the pin header connector has its own plastic constraint), thereby maintaining a certain lateral spacing between the rigid conductors 4. This spacing is adapted to the spacing between the positive and negative terminals 3.2 of the color-tunable LED filament 3.

[0021] The set of rigid conductors 4 has one end welded to the protruding end of the outer guide wire 6, and the other end welded to the positive and negative terminals 3.2 of the end of the adjustable color LED filament 3. Under the premise of satisfying the welding requirements between the outer guide wire 6 and the rigid conductors 4, the shorter the protruding end of the outer guide wire 6, the stronger its bending resistance. For example... Figure 2 As shown, after the rigid conductor 4 and the tunable LED filament 3 are welded together, they can be regarded as a whole rigid structure. When the distance between the tunable LED filament 3 and the sintering head 7 is the same, compared with the outer conductor 6 being directly welded to the tunable LED filament 3, the center of gravity A of the whole rigid structure will be closer to the outer conductor 6. The swing amplitude will be smaller when subjected to impact, and the reset will be easier.

[0022] The adjustable LED filament 3 is an existing filament, typically comprising a substrate, multiple light-emitting lines disposed on the substrate for emitting different colors, and phosphor coating covering the front and back of the substrate and each light-emitting line. One pole of each light-emitting line is connected to form a common terminal and extends to the end of the substrate, while the other pole of each light-emitting line extends to the end of the substrate where the common terminal is located, forming a single-ended power supply structure.

[0023] The embodiment also provides a tunable color bulb, which has a glass bulb 1 similar to an existing LED bulb, a horn tube sintered at the tail end of the glass bulb 1, a lamp cap 2 fixed at the tail end of the glass bulb 1, and a driving module installed in the lamp cap 2, an input end of the driving module is electrically connected with the lamp cap 2, and the glass bulb 1 is filled with an inert gas. In addition, the tunable color bulb also comprises the welding structure of the tunable color filament, and the other end of the outer wire 6 is connected with the driving module. The tunable color LED filament 3 is located at the axis of the glass bulb 1, and the non-powered end of the tunable color LED filament 3 is arranged in a cantilevered manner in the glass bulb 1.

[0024] In the embodiment, the material of the row pin of the row pin connector is determined according to the requirement, and the number of the row pin is determined according to the number of the positive and negative contact points 3.2 of the tunable color LED filament 3.

[0025] The above only describes the preferred embodiments of the present application, and the present application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A welding structure for a color-tunable LED filament, comprising a single-ended power-supply color-tunable LED filament (3), and a plurality of external guide wires (6) fixed on a sintering head (7) of a horn tube, wherein the ends of the external guide wires (6) extend a certain distance from the sintering head (7), characterized in that: It also includes a set of rigid conductors (4), one end of which is welded one-to-one with the protruding end of the outer guide wire (6), and the other end is welded one-to-one with the positive and negative terminals of the end of the adjustable LED filament (3); after the rigid conductor (4) and the adjustable LED filament (3) are welded, they are regarded as an integral rigid structure. Under the premise that the welding of the outer guide wire (6) and the rigid conductor (4) can be satisfied, the shorter the protruding end of the outer guide wire (6), the stronger its bending resistance. The middle section of the set of rigid conductors (4) is fixed by an insulating constraint (5) and maintains a certain distance from each other.

2. The welding structure of a color-tunable filament as described in claim 1, characterized in that: The set of rigid conductors (4) are the pin headers of the pin header connector.

3. The welding structure of the tunable filament as described in claim 1, characterized in that: The adjustable LED filament (3) includes a substrate, multiple light-emitting lines disposed on the substrate for emitting different colors, and fluorescent adhesive covering the front and back of the substrate and each light-emitting line.

4. The welding structure of a dimmable filament as described in claim 3, characterized in that: One pole of each light-emitting line is connected to form a common terminal and extends to the end of the substrate. The other pole of each light-emitting line extends to the end of the substrate where the common terminal is located, forming a single-ended power supply structure.

5. A dimmable light bulb, comprising a glass bulb (1), a horn tube sintered at the end of the glass bulb (1), a lamp holder (2) fixed at the end of the glass bulb (1), and a drive module installed in the lamp holder (2), wherein the glass bulb (1) is filled with an inert gas, characterized in that: It also includes a welding structure for the color-tunable filament as described in any one of claims 1 to 4, wherein the other end of the outer guide wire (6) is connected to the drive module.

6. A dimmable light bulb as described in claim 5, characterized in that: The adjustable LED filament (3) is located on the axis of the glass bulb (1), and its non-powered end is suspended inside the glass bulb (1).

Images