Lamp

Abstract

The utility model discloses a lamp, and belongs to the technical field of illumination. A lamp comprises a lamp holder, a bulb shell and a core column, the bottom of the bulb shell is fixedly connected with the lamp holder, the core column is arranged in the bulb shell, and the bottom of the core column and the bottom of the bulb shell are packaged to form a sealed cavity in the bulb shell, and is characterized in that a first lamp filament is arranged on the periphery of the core column in the sealed cavity in a surrounding mode, one end of the first lamp filament is close to the top of the core column, and the other end of the first lamp filament is close to the top of the core column. The other end is close to the core column bottom; at least one group of second lamp filaments distributed in a strip shape are arranged in the axial direction in the core column or on the outer side of the core column in the axial direction, and the second lamp filaments are located in an interval defined by the first lamp filaments; the first lamp filament is a basic color light source module, and the second lamp filament is a color temperature light source module; or, the first lamp filament is a color temperature light source module, and the second lamp filament is a basic color light source module; by means of the arrangement, the internal modeling of the lamp is more diversified, and meanwhile debugging of the RGBCW multi-color light source can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of lighting, and more specifically relates to a lamp. Background Art

[0002] RGBCW lamp is an advanced lighting technology that combines five light sources: red, green, blue, cold white and warm white. It can provide colorful lighting effects and a wide range of color temperature adjustment. This technology is widely used in smart home lighting, commercial lighting and outdoor lighting.

[0003] In the prior art, the utility model patent “LED flexible light strip and LED flexible lamp” disclosed in Chinese patent application number “CN201922401006.0” discloses an LED flexible light strip and an LED flexible lamp, wherein the LED flexible light strip comprises several groups of monochromatic light source filaments and a flexible light-transmitting layer; the flexible light-transmitting layer is wrapped on the surface of each monochromatic light source filament; each monochromatic light source filament is arranged in parallel to form a strip light strip; in this way, a plurality of originally scattered light sources are concentrated on one flexible filament, but in this way, not only the width of the light source is increased, but also the pins for conducting the light source with external electrical connection are highly concentrated, which increases the difficulty of production, and since all the light sources are concentrated together, it is easy for the light sources to interfere with each other, affecting the purity of each light. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a lamp which can realize the control of multiple color temperatures and multiple colors.

[0005] The utility model discloses a lamp, comprising a lamp holder, a bulb shell and a stem, wherein the bottom of the bulb shell is fixedly connected to the lamp holder, the stem is arranged in the bulb shell, and the bottom of the stem is sealed with the bottom of the bulb shell to form a sealed cavity in the bulb shell, characterized in that at least one first filament is arranged around the outer periphery of the stem in the sealed cavity, and one end of the first filament is close to the top of the stem, and the other end is close to the bottom of the stem;

[0006] At least one group of second filaments distributed in strips is arranged in the axial direction of the core column or on the outer side of the core column along the axial direction, and the second filaments are located in the interval formed by the first filaments;

[0007] A plurality of conductive leads are respectively provided at one end or both ends of the first filament and the second filament, and are electrically connected to the lamp holder through the plurality of conductive leads passing through the stem;

[0008] The first filament is a basic color light source module, and the second filament is a color temperature light source module;

[0009] Or, the first filament is a color temperature light source module, and the second filament is a basic color light source module.

[0010] As a further improvement of the utility model, the color temperature light source module includes a warm white light emitting chip and / or a cold white light emitting chip, a first conductive circuit, a first substrate and a first light-transmitting adhesive layer, a plurality of warm white light emitting chips and / or cold white light emitting chips are laid along the length direction of the first substrate according to different color temperatures, and each column of light emitting chips with the same color temperature is connected in series, in parallel or in series and in parallel through the first conductive circuit, and each column of light emitting chips with the same color temperature is covered and coated to the first substrate through the first light-transmitting adhesive layer;

[0011] As a further improvement of the present invention, the first substrate is a flexible substrate or a rigid substrate, and the back side of the first substrate is covered with a second light-transmitting adhesive layer at a position corresponding to the first light-transmitting adhesive layer.

[0012] As a further improvement of the utility model, the basic color light source module includes a second substrate, a second conductive circuit, a third light-transmitting adhesive layer and a number of natural color light-emitting chips of different colors, and the number of natural color light-emitting chips of different colors are laid out in a row along the front length direction of the second substrate according to different colors, and the natural color light-emitting chips of the same color in each column are connected in series, in parallel or in series and parallel through the second conductive circuit, and the natural color light-emitting chips of the same color in each column are covered and wrapped to the second substrate through the third light-transmitting adhesive layer.

[0013] As a further improvement of the present invention, the second substrate is a flexible substrate or a rigid substrate, and the back side of the second substrate is covered with a fourth light-transmitting adhesive layer corresponding to the position of each third light-transmitting adhesive layer.

[0014] As a further improvement of the utility model, the core column includes a horn tube and a support column, the support column is vertical to the top of the horn tube, and a plurality of conductive leads pass through the top of the horn tube and are arranged on both sides of the support column;

[0015] A power driver is arranged in the lamp holder, and the first filament and the second filament in the sealed cavity are electrically connected to the lamp holder through the power driver via conductive leads.

[0016] As a further improvement of the utility model, the support column is a hollow column; the first filament is a flexible filament, which is spirally arranged around the support column; the second filament is a rigid filament or a flexible filament, which is inserted into the inner cavity of the support column.

[0017] As a further improvement of the present invention, a plurality of supporting filaments for positioning and supporting the first filament are arranged between the first filament and the supporting column.

[0018] As a further improvement of the present invention, the interior of the support column and / or the horn tube is filled with and cured with light-transmitting glue or concealing glue;

[0019] Alternatively, the inner wall of the support column and / or the horn tube is provided with a frosted layer, a reflective layer, a diffusion layer or a concealing coating.

[0020] As a further improvement of the utility model, the support column is a hollow column, and a through hole is opened on one side of the bottom thereof, and a plurality of conductive leads pass through the inner cavity of the support column and are led out from the top of the support column and electrically connected to one end of the first filament and / or the second filament;

[0021] An air pipe is arranged in the trumpet tube, the upper end of the air pipe is connected to the sealed cavity through a through opening, the lower end of the air pipe is sealed, and the sealed cavity is filled with an inert gas or a mixed gas of inert gases;

[0022] One end of each conductive lead wire located in the speaker tube is respectively covered with an insulating sleeve.

[0023] Compared with the prior art, the utility model has the following beneficial effects: the solution of the utility model adopts two groups of filaments, including a first filament and a second filament, the first filament surrounds the stem to form an area, and the second filament is arranged in the area formed by the first filament; the filaments are divided into two groups, and flexible filaments or rigid filaments can be selected according to needs, so that the shape of the filament inside the bulb is increased, and the debugging of RGBCW multi-color temperature and multi-color light sources can be realized;

[0024] Since the filament is divided into a color temperature light source module and a basic color light source module, different from the prior art that uses one filament, all light source modules are integrated on one filament, so as to avoid the light from light sources of different color temperatures or colors affecting each other due to the excessive concentration of chips on the filament, so that the emitted light deviates from the expected demand;

[0025] Compared with concentrating all chips on one filament, which makes it difficult to solder due to too many pins on one filament, two sets of filament light sources solve the problem of excessive concentration of filament pins, reduce the difficulty of operation during production, improve production yield, and reduce losses;

[0026] Moreover, the filament light sources are divided into two groups, and the substrate of each group of filament light sources can be small enough and have enough space to carry the corresponding light-emitting chip, so that the matching of the filament and the driving power supply can achieve more functions and is suitable for intelligent control. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is one of the structural schematic diagrams of the lamp of the utility model;

[0028] Figure 2 This is the second structural schematic diagram of the lamp of the utility model;

[0029] Figure 3 This is the third structural schematic diagram of the lamp of the utility model;

[0030] Figure 4 This is the fourth structural schematic diagram of the lamp of the utility model;

[0031] Figure 5 This is the fifth structural diagram of the lamp of the utility model;

[0032] Figure 6 This is one of the structural schematic diagrams of the light source module of the utility model;

[0033] Figure 7 This is a schematic diagram of the color temperature light source module structure of the utility model;

[0034] Figure 8 This is the second schematic diagram of the light source module structure of the utility model;

[0035] Fig. 9 This is a schematic diagram of the basic color light source module structure of the utility model;

[0036] Fig.10 It is a schematic diagram of the structure inside the core column of the filament assembly of the utility model;

[0037] Fig.11 This is a schematic diagram of the core column structure of the utility model.

[0038] Description of the numbers in the figure:

[0039] 1. Lamp holder; 11. First substrate; 12. First light-transmitting adhesive layer; 13. Second light-transmitting adhesive layer; 2. Bulb shell; 21. Second substrate; 23. Third light-transmitting adhesive layer; 24. Fourth light-transmitting adhesive layer; 3. Core column; 31. Horn tube; 32. Support column; 33. Air pipe; 34. Through port; 4. First filament; 5. Second filament; 6. Conductive lead; 7. Driver; 8. Support wire; 10. Warm white light-emitting chip; 101. Warm white light-emitting module; 20. Cold white light-emitting chip; 201. Cold white light-emitting module; 30. Red light-emitting chip; 301. Red light-emitting module; 40. Green light-emitting chip; 401. Green light-emitting module; 50. Blue light-emitting chip; 501. Blue light-emitting module; 100. Sealed cavity. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below in conjunction with the embodiments. The following embodiments are intended to explain the present invention but the present invention is not limited to the following embodiments.

[0041] Specific implementation: Please refer to Figure 1-11A lamp comprises a lamp holder 1, a bulb shell 2 and a stem 3, wherein the bottom of the bulb shell 2 is fixedly connected to the lamp holder 1, the stem 3 is arranged in the bulb shell 2, and the bottom of the stem 3 is encapsulated with the bottom of the bulb shell 2 to form a sealed cavity 100 in the bulb shell, and at least one first filament 4 is arranged around the outer periphery of the stem 3 in the sealed cavity 100, and one end of the first filament 4 is close to the top of the stem 3, and the other end of the first filament 4 is close to the bottom of the stem 3.

[0042] At least one group of second filaments 5 distributed in strips is arranged in the axial direction of the core column 3 or on the outer side of the core column 3 along the axial direction, and the second filaments 5 are located in the interval surrounded by the first filaments 4 .

[0043] A plurality of conductive leads 6 are respectively disposed at one end or both ends of the first filament 4 and the second filament 5 , and are electrically connected to the lamp holder 1 through the conductive leads 6 passing through the stem 3 .

[0044] The first filament 4 is a basic color light source module, and the second filament 5 is a color temperature light source module; or, the first filament 4 is a color temperature light source module, and the second filament 5 is a basic color light source module.

[0045] Each light source module includes a plurality of light-emitting chips, a conductive circuit and a substrate. The light-emitting chips are laid out in a row along the length direction of the substrate, and the corresponding light-emitting chips are connected in series, in parallel or in series and in parallel through conductive circuits to form a corresponding light-emitting circuit; the light-emitting chips are one or more of a blue light-emitting chip 50, a warm white light-emitting chip 10, a cold white light-emitting chip 20, a red light-emitting chip 30 and a green light-emitting chip 40.

[0046] The light emitting chip includes a first light emitting chip and a second light emitting chip; the substrate includes a first substrate 11 and a second substrate 12; and the conductive circuit includes a first conductive circuit and a second conductive circuit.

[0047] The color temperature light source module is a cold white light emitting module 201 and / or a warm white light emitting module 101 ; the basic color light source module is one or more of a red light emitting module 301 , a green light emitting module 401 and a blue light emitting module 501 .

[0048] Optionally, the color temperature light source module includes a plurality of first light-emitting chips, a first conductive circuit, a first substrate 11 and a first light-transmitting adhesive layer 12. The plurality of first light-emitting chips are arranged in a row along the length direction of the first substrate 11 according to different color temperatures, and the corresponding first light-emitting chips are connected in series, in parallel or in series and in parallel through the first conductive circuit to form a light-emitting circuit of the corresponding color temperature. The first light-transmitting adhesive layer 12 covers and wraps the first substrate 11, thereby forming the corresponding color temperature.

[0049] Optionally, the first light-emitting chip is one or more of a blue light-emitting chip 50 , a warm white light-emitting chip 10 and a cool white light-emitting chip 20 .

[0050] Optionally, the first substrate 11 is a flexible substrate or a rigid substrate; the back side of the first substrate 11 is covered with a second light-transmitting adhesive layer 13 at a position corresponding to the first light-transmitting adhesive layer 12 .

[0051] Optionally, the first light-emitting chip includes a warm white light-emitting chip 10 and / or a cold white light-emitting chip 20, and a plurality of warm white light-emitting chips 10 and / or cold white light-emitting chips 20 are laid out in a row along the length direction of the first substrate 11 according to different color temperatures. The light-emitting chips with the same color temperature in each column are connected in series, in parallel, or in a mixed series and parallel manner through a first conductive circuit to form a light-emitting circuit of the corresponding color temperature, and the light-emitting chips with the same color temperature in each column are covered and coated on the first substrate 11 by a first light-transmitting adhesive layer 12, thereby obtaining corresponding cold white light-emitting modules 201 and / or warm white light-emitting modules 101, respectively.

[0052] Optionally, the first light-emitting chip is a warm white light-emitting chip 10 and a cold white light-emitting chip 20; a plurality of warm white light-emitting chips 10 are connected in series, in parallel, or in a series-parallel mixture to form a warm white light-emitting circuit, and a plurality of cold white light-emitting chips 20 are connected in series, in parallel, or in a series-parallel mixture to form a cold white light-emitting circuit.

[0053] Optionally, the first light-emitting chip is a blue light-emitting chip 50, and a plurality of blue light-emitting chips 50 are connected in series, in parallel, or in a mixture of series and parallel to form two light-emitting circuits, and the two light-emitting circuits are respectively covered with corresponding first light-transmitting adhesive layers 12, and the first light-transmitting adhesive layer 12 is an adhesive layer mixed with fluorescent powder, and the ratios of the fluorescent powders in the first light-transmitting adhesive layers 12 on the two light-emitting circuits are different, so corresponding cold white light-emitting modules 201 and warm white light-emitting modules 101 are respectively formed.

[0054] Optionally, the cold white light emitting module 201 and the warm white light emitting module 101 are arranged side by side along the front length direction of the first substrate 11. The warm white light emitting chip (10) and / or the cold white light emitting chip (20) is a blue light chip 50 that is excited by a correspondingly configured fluorescent glue layer to form a cold white or warm white color.

[0055] Optionally, the basic color light source module includes a plurality of second light-emitting chips, a second conductive circuit, a second substrate 21 and a third light-transmitting adhesive layer 23. The plurality of light-emitting chips are respectively laid along the length direction of the front surface of the second substrate 21, and the light-emitting chips of the same color are respectively connected in series, in parallel, or in series and in parallel through the second conductive circuits to form light-emitting circuits of corresponding colors. The third light-transmitting adhesive layer 23 covers the light-emitting circuits of corresponding colors and is wrapped around the front surface of the second substrate 21, thereby forming a light-emitting module of the corresponding color.

[0056] Optionally, the second light-emitting chip is a plurality of natural color light-emitting chips of different colors; the plurality of natural color light-emitting chips are laid out in a row along the length direction of the second substrate 21 according to different colors, and the natural color light-emitting chips of the same color in each row are connected in series, in parallel, or in series and in parallel through a second conductive circuit, and the natural color light-emitting chips of the same color in each row are covered and coated to the second substrate 21 through a third light-transmitting adhesive layer 23; the third light-transmitting adhesive layer 23 can be a transparent adhesive layer.

[0057] Preferably, the true color light emitting chip is one or more of a blue light emitting chip 50 , a red light emitting chip 30 and a green light emitting chip 40 .

[0058] Optionally, the second substrate 21 is a flexible substrate or a rigid substrate; the back surface of the second substrate 21 and the positions corresponding to the third light-transmitting adhesive layers 23 are covered with fourth light-transmitting adhesive layers 24 .

[0059] Optionally, the second light-emitting chip includes a red light-emitting chip 30, a green light-emitting chip 40 and a blue light-emitting chip 50, and one or more groups of the red light-emitting chips 30, the green light-emitting chips 40 or the blue light-emitting chips 50 are selected and laid along the front length direction of the second substrate 21, and the light-emitting chips of the same color are connected in series, in parallel or in series and in parallel through the second conductive circuit to form light-emitting circuits of corresponding colors, and the third light-transmitting adhesive layer 23 covers the light-emitting circuits of corresponding colors and is wrapped to the front of the second substrate 21.

[0060] Optionally, a plurality of red light emitting chips 30 form a red light circuit, a plurality of green light emitting chips 40 form a green light circuit, and a plurality of blue light emitting chips 50 form a blue light circuit, thereby obtaining corresponding red light emitting modules 301, green light emitting modules 401 and blue light emitting modules 501 respectively.

[0061] Optionally, the second light-emitting chip is a blue light-emitting chip 50, and several blue light-emitting chips 50 are connected in series, in parallel, or in a mixture of series and parallel to form three light-emitting circuits, and the three light-emitting circuits are respectively covered with corresponding first light-transmitting adhesive layers 12; the third light-transmitting adhesive layers 23 on two of the light-emitting circuits are adhesive layers mixed with fluorescent powder, and the proportions of the fluorescent powders in the third light-transmitting adhesive layers 23 on the two light-emitting circuits are different, thereby forming corresponding red light-emitting modules 301 and green light-emitting modules 401 respectively; the third light-transmitting adhesive layer 23 on the other light-emitting circuit is a transparent adhesive layer, forming a blue light-emitting module 501.

[0062] Optionally, the red light emitting module 301 , the green light emitting module 401 and the blue light emitting module 501 are respectively arranged side by side along the front length direction of the second substrate 21 .

[0063] The core column 3 includes a speaker tube 31 and a support column 32 . The support column 32 is vertical to the top of the speaker tube 31 . A plurality of conductive leads 6 pass through the top of the speaker tube 31 and are arranged on both sides of the support column 32 .

[0064] Optionally, one end of the support column 32 passes through the top of the trumpet tube 31 and extends into the trumpet tube 31 .

[0065] Optionally, a power driver 7 is provided in the lamp holder 1 , and the first filament 4 and the second filament 5 in the sealed cavity 100 are electrically connected to the lamp holder 1 through the power driver 7 via the conductive lead 6 .

[0066] Optionally, the first filament 4 is a flexible filament, which surrounds the support column 32 and is arranged in a spiral shape; a plurality of support filaments 8 for positioning and supporting the first filament 4 are arranged between the first filament 4 and the support column.

[0067] Optionally, the first filaments 4 surround the support column 32 and are in the form of straight strips, and are arranged at intervals on the outer circumference of the support column 32 .

[0068] Optionally, the support column 32 is a hollow column; the first filament 4 is a flexible filament, and the first filament 4 is spirally arranged around the support column 32; the second filament 5 is a rigid filament or a flexible filament, and the second filament 5 is passed through the inner cavity of the support column 32.

[0069] Optionally, the support column 32 and / or the horn tube 31 are filled with and cured with light-transmitting glue or concealing glue; or, the inner wall of the support column and / or the horn tube 31 is provided with a frosted layer, a reflective layer, a diffusion layer or a concealing coating.

[0070] Optionally, the light-transmitting glue may be a thermally conductive glue; the light-transmitting glue may be a transparent glue, a white glue, or a colored glue, and may be prepared according to demand.

[0071] Optionally, the reflective layer is a mirror layer.

[0072] Optionally, the hollow column is a glass light-guiding column.

[0073] Optionally, the support column 32 is a hollow column, and a through hole 34 is opened on one side of the bottom thereof, and a plurality of conductive leads 6 pass through the inner cavity of the support column 32 and are led out from the top of the support column 32 to be electrically connected to one end of the first filament 4 and / or the second filament 5;

[0074] An air pipe 33 is provided in the bell tube 31 . The upper end of the air pipe 33 is connected to the sealed cavity 100 through a through port 34 , and the lower end is sealed. The sealed cavity 100 is filled with an inert gas or a mixed gas of an inert gas or a mixed gas of an inert gas and oxygen.

[0075] Optionally, one end of each conductive lead 6 located inside the speaker tube 31 is respectively sleeved with an insulating sleeve.

[0076] The above is only a preferred specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed in the present application according to the technical solution and improved ideas of the present application, which should be covered by the protection scope of the present application.

Claims

1. A lamp, comprising a lamp holder (1), a bulb (2) and a stem (3), wherein the bottom of the bulb (2) is fixedly connected to the lamp holder (1), the stem (3) is arranged in the bulb (2), and the bottom of the stem (3) is sealed with the bottom of the bulb (2) to form a sealed cavity (100) in the bulb, characterized in that: At least one first filament (4) is arranged around the outer periphery of the core column (3) in the sealed cavity (100), and one end of the first filament (4) is close to the top of the core column (3), and the other end is close to the bottom of the core column (3); At least one group of second filaments (5) distributed in a strip shape is arranged in the axial direction of the core column (3) or on the outer side of the core column (3) along the axial direction thereof, and the second filaments (5) are located in the interval formed by the first filaments (4); A plurality of conductive leads (6) are respectively provided at one end or both ends of the first filament (4) and the second filament (5), and are electrically connected to the lamp holder (1) through the plurality of conductive leads (6) passing through the stem (3); The first filament (4) is a basic color light source module, and the second filament (5) is a color temperature light source module; Alternatively, the first filament (4) is a color temperature light source module, and the second filament (5) is a basic color light source module.

2. A lamp according to claim 1, characterized in that: The color temperature light source module comprises a warm white light emitting chip (10) and / or a cold white light emitting chip (20), a first conductive circuit, a first substrate (11) and a first light-transmitting adhesive layer (12); a plurality of warm white light emitting chips (10) and / or cold white light emitting chips (20) are arranged in rows along the length direction of the first substrate (11) according to different color temperatures; the light emitting chips of the same color temperature in each row are connected in series, in parallel or in series and in parallel via the first conductive circuit; and the light emitting chips of the same color temperature in each row are covered and coated onto the first substrate (11) via the first light-transmitting adhesive layer (12).

3. A lamp according to claim 2, characterized in that: The first substrate (11) is a flexible substrate or a rigid substrate, and the back side of the first substrate (11) is covered with a second light-transmitting adhesive layer (13) at a position corresponding to the first light-transmitting adhesive layer (12).

4. A lamp according to claim 1, characterized in that: The basic color light source module comprises a second substrate (21), a second conductive circuit, a third light-transmitting adhesive layer (23), and a plurality of natural color light-emitting chips of different colors. The plurality of natural color light-emitting chips are arranged in rows along the length direction of the second substrate (21) according to different colors. The natural color light-emitting chips of the same color in each row are connected in series, in parallel, or in series and in parallel via the second conductive circuit, and the natural color light-emitting chips of the same color in each row are covered and coated onto the second substrate (21) via the third light-transmitting adhesive layer (23).

5. A lamp according to claim 4, characterized in that: The second substrate (21) is a flexible substrate or a rigid substrate, and the back surface of the second substrate (21) and the positions of the third light-transmitting adhesive layers (23) are covered with fourth light-transmitting adhesive layers (24).

6. A lamp according to claim 1, characterized in that: The core column (3) comprises a horn tube (31) and a support column (32), the support column (32) being vertical to the top of the horn tube (31), and a plurality of conductive leads (6) penetrating the top of the horn tube (31) and arranged on both sides of the support column (32); A power driver (7) is provided in the lamp holder (1), and a first filament (4) and a second filament (5) in the sealed cavity (100) are electrically connected to the lamp holder (1) via a conductive lead (6) through the power driver (7).

7. A lamp according to claim 6, characterized in that: The support column (32) is a hollow column; the first filament (4) is a flexible filament, which is spirally arranged around the support column (32); and the second filament (5) is a rigid filament or a flexible filament, which is inserted into the inner cavity of the support column (32).

8. A lamp according to claim 6 or 7, characterized in that: A plurality of support filaments (8) for positioning and supporting the first filament (4) are arranged between the first filament (4) and the support column.

9. A lamp according to claim 6, characterized in that: The support column (32) and / or the trumpet tube (31) are filled with and cured with light-transmitting glue or concealing glue; Alternatively, the inner wall of the support column (32) and / or the horn tube (31) is provided with a frosted layer, a reflective layer, a diffusion layer or a concealing coating.

10. A lamp according to claim 6, characterized in that: The support column (32) is a hollow column, and a through hole (34) is provided on one side of the bottom thereof. A plurality of conductive leads (6) pass through the inner cavity of the support column (32), and are led out from the top of the support column (32) to be electrically connected to one end of the first filament (4) and / or the second filament (5). An air pipe (33) is provided in the bell tube (31), and the upper end of the air pipe (33) is connected to the sealed cavity (100) through the through hole (34), and the lower end is sealed. The sealed cavity (100) is filled with an inert gas or a mixed gas of inert gases. An insulating sleeve is provided at one end of each conductive lead (6) located in the bell tube (31).

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