CN105465640B

CN105465640B - LED straight tube lamp

Info

Publication number: CN105465640B
Application number: CN201510496663.1A
Authority: CN
Inventors: 江涛
Original assignee: Jiaxing Super Lighting Electric Appliance Co Ltd
Current assignee: Jiaxing Super Lighting Electric Appliance Co Ltd
Priority date: 2014-09-28
Filing date: 2015-08-13
Publication date: 2024-04-02
Anticipated expiration: 2035-08-13
Also published as: GB2531425B; GB201516993D0; GB2545592B; GB201711722D0; GB2545592A; GB2545366B; HK1222444A1; AU2015230858B2; GB2545366A; GB2549435B; GB2549435A; GB2531425A; GB201704611D0; GB201704608D0; HK1247980B; CN105465640A

Abstract

The invention discloses a welding method of an LED straight tube lamp, which is characterized in that a light source bonding pad is arranged on the end part of a preset bonding pad, a power source bonding pad corresponding to the light source bonding pad is arranged on a circuit board of a power source, a welding perforation or a welding notch through which soldering tin flows is arranged on the light source bonding pad, then the soldering tin passes through a welding pressure head with a pressure welding surface, a diversion trench, a tin forming groove and a pressing surface, and is heated and melted, the soldering tin passes through the welding perforation or the welding notch to be accumulated around the surface of the welding perforation or the welding notch, and the light source bonding pad and the power source bonding pad are welded together after cooling.

Description

LED straight tube lamp

Technical Field

The invention relates to the field of lighting fixtures, in particular to an LED straight tube lamp, a light source design, an electronic assembly and a lamp cap structure thereof.

Background

The LED straight tube lamp generally comprises a lamp tube, a lamp plate which is arranged in the lamp tube and provided with a light source, and lamp holders which are arranged at two ends of the lamp tube, wherein a power supply is arranged in the lamp holders, and the light source and the power supply are electrically connected through the lamp plate.

The following quality problems easily occur in the existing LED straight tube lamp:

firstly, the lamp panel is generally a rigid plate, and when the lamp tube is broken, especially when the lamp tube is broken locally, the whole LED fluorescent lamp is still in a straight tube state, and a user can mistakenly consider that the lamp tube can be used, so that the lamp tube can be automatically installed, and electric leakage and electric shock accidents are easy to occur.

Secondly, in the existing LED straight tube lamp, the rigid lamp panel and the lamp cap are generally electrically connected by adopting a metal wire bonding mode, and in the manufacturing, transporting and using processes, the metal wire bonding mode can accidentally find that the metal wire bonding mode is broken due to moving, so that the quality problem is formed.

Disclosure of Invention

The invention provides a novel LED straight tube lamp for solving the problems.

The invention provides a welding method of an LED straight tube lamp, which comprises a lamp tube, a lamp cap arranged at one end of the lamp tube, a power supply arranged in the lamp cap, and a lamp board arranged in the lamp tube, wherein the lamp board is a flexible circuit board, and is characterized by comprising the following steps:

presetting a bonding pad: a light source bonding pad is arranged at the end part of the lamp panel, and a power source bonding pad corresponding to the light source bonding pad at the end part of the flexible circuit board is arranged on the circuit board of the power source;

providing a welding perforation/welding gap: a welding perforation or a welding notch which can enable solder to flow through is arranged on the light source bonding pad;

welding: welding the light source bonding pad and the power source bonding pad together by a welding press head, wherein the welding press head is divided into four areas: the welding device comprises a welding surface, a diversion trench, a tin forming groove and a pressing surface, wherein the welding surface is a surface actually contacted with soldering tin, the pressure and a heating source are provided in the welding step, and the diversion trench which is concave in the arc shape is arranged at the lower edge part of the welding surface in the middle of the welding pressure head and is used for ensuring that the soldering tin which is melted by heating of the welding surface can flow into the welding perforation or the welding notch which passes through the bonding pad from the concave diversion trench space;

Heating and melting: the soldering tin is heated and melted by the pressure welding surface, the soldering tin passes through the welding perforation or the welding notch to be accumulated around the surface of the soldering tin, a tin forming groove which is positioned below the diversion trench and is more concave than the diversion trench is used for providing a containing position for the soldering tin to be condensed into a solder ball, a plane which is lower than the pressure welding surface at the periphery of the tin forming groove is the pressure welding surface, and the difference between the height and the thickness of the soldering tin and the pressure welding surface is the thickness of the flexible circuit board so as to press and fix the flexible circuit board on the printed circuit board of the power supply in the welding process; and

and (3) cooling and fixing: and the soldering tin is piled around the welding perforation or the welding notch to form a solder ball with the diameter larger than that of the welding perforation or the welding notch, so that the light source bonding pad and the power source bonding pad are electrically connected and fixed.

In an embodiment of the present invention, the welding perforation or the welding notch on the light source pad is formed in advance or is formed by punching through a welding press head in the welding process.

In one embodiment of the present invention, a positioning hole is provided on the flexible circuit board, and the light source pad and the power source pad are positioned through the positioning hole during the welding step.

In one embodiment of the invention, the lamp panel is fixed on the inner peripheral surface of the lamp tube through an adhesive sheet.

In an embodiment of the present invention, the light source pad and the power source pad are welded on the same side surface, and one end of the flexible circuit board and the power source welded has a lateral tension on the power source.

In an embodiment of the present invention, the light source pad and the power source pad are welded on the same side surface, and one end of the flexible circuit board and the power source welded on the power source has a downward pulling force.

In an embodiment of the invention, the flexible circuit board has a free portion, and the free portion is contracted towards the inside of the lamp tube during the assembly process.

In an embodiment of the present invention, the light source pad of the flexible circuit board is superimposed on the power source pad of the power source, and the welding press head is pressed on the flexible circuit board.

The invention provides an LED straight tube lamp, comprising:

the lamp comprises a lamp tube and a lamp cap arranged at one end of the lamp tube;

the lamp panel is arranged in the lamp tube, and a light source is arranged on the lamp panel; and

the power supply is arranged in the lamp cap;

the welding method is characterized in that the light source and the power supply are electrically connected through the lamp panel by adopting any one of the welding methods.

Compared with the prior art, the technical scheme of the invention has the following advantages:

the lamp panel adopts the flexible circuit board, so that the lamp tube can not keep a straight tube state after being broken, for example, the lamp tube is broken into two sections, and a user can not consider that the lamp tube can be used for self-installation, thereby avoiding electric shock accidents.

Further, the flexible circuit board is directly welded at the power output end of the lamp cap, and is not easy to break in the moving process.

Further, the welding pressure is completed through the welding pressure head by the light source bonding pad and the power source bonding pad, the soldering tin can be guided between the light source bonding pad and the power source bonding pad after being heated and melted through the welding pressure head, the process is simple, the welding reliability is improved, and the overall quality of products is further improved.

The present invention achieves one or any combination of the above advantages through the above design.

Drawings

FIG. 1 is a perspective view of an LED straight tube lamp according to an embodiment of the present invention;

FIG. 2 is an exploded perspective view of an LED straight tube lamp according to an embodiment of the present invention;

FIG. 3 shows the end structure of a tube in an LED straight tube lamp according to an embodiment of the present invention;

FIG. 4 is a first configuration of a lamp cap in an LED straight tube lamp according to an embodiment of the present invention, wherein the configuration of the exterior of the lamp cap is shown;

FIG. 5 is a second construction of a lamp cap in an LED straight tube lamp according to an embodiment of the present invention, wherein the construction of the interior of the lamp cap is shown;

FIG. 6 shows the configuration of a power supply in an LED straight tube lamp according to an embodiment of the present invention;

FIG. 7 shows the structure of the connection position of the lamp cap and the lamp tube in the LED straight tube lamp according to the embodiment of the invention;

FIG. 8 is a schematic diagram showing a heating and solidifying process of an all-plastic lamp cap (with magnetic conductive metal pieces and hot melt adhesive) and a lamp tube through an induction coil in a modification of the embodiment of the invention;

FIG. 9 is a perspective cross-sectional view of the all plastic burner of FIG. 8 (with magnetically permeable metallic pieces and hot melt adhesive therein);

fig. 10 is a perspective view showing a structure in which a supporting portion and a protruding portion are provided on an inner peripheral surface of an insulating tube in the all plastic base;

FIG. 11 is a cross-sectional view taken along the X-X direction in FIG. 10;

FIG. 12 is a schematic view of a magnetically permeable metallic article having at least one void structure, as seen in a radial direction;

FIG. 13 shows a schematic view of a magnetically permeable metallic article having at least one indentation, as seen in a radial direction;

FIG. 14 is a cross-sectional view of the insulating tube and the lamp tube of FIG. 10 after being combined, along the axial direction of the lamp tube, wherein the magnetically conductive metal member has a circular ring structure;

FIG. 15 is a cross-sectional view of the magnetic conductive metal member in an elliptical ring structure along the axial direction of the lamp tube;

FIG. 16 shows a structure in which a flexible circuit board in an LED straight tube lamp climbs over a reinforcing part and is welded with a power supply output end;

fig. 17 shows a layer structure of a double-layer flexible circuit board;

FIG. 18 is a cross-sectional view of a tube in an LED straight tube lamp according to an embodiment of the present invention along an axial direction;

fig. 19 shows a cross-sectional view of the first modification of fig. 18 with the reflective film and the lamp panel side contact in the axial direction;

fig. 20 is a cross-sectional view of the lamp tube in the axial direction in the second modification of fig. 18;

fig. 21 is a cross-sectional view showing a lamp tube in the axial direction in the third modification of fig. 18;

fig. 22 is a cross-sectional view of the lamp tube in the axial direction in the fourth modification of fig. 18;

FIG. 23 is a perspective view of a bracket in a light source of an LED straight tube lamp according to an embodiment of the present invention;

FIG. 24 shows a pad block diagram of a flexible circuit board of an LED straight tube lamp in accordance with an embodiment of the present invention;

FIG. 25 is a diagram showing a pad structure of a flexible circuit board having 3 pads according to an embodiment of the present invention;

FIG. 26 shows a pad structure diagram of a flexible circuit board having 3 pads according to an embodiment of the present invention;

FIG. 27 shows a pad structure diagram of a flexible circuit board having 4 pads according to an embodiment of the present invention;

FIG. 28 shows a pad structure diagram of a flexible circuit board having 4 pads according to an embodiment of the present invention;

Fig. 29 shows a pad structure diagram of a flexible circuit board according to an embodiment of the invention, wherein the pad has holes;

FIG. 30 shows a side cross-sectional partial enlarged view of the flexible circuit board of FIG. 29 soldered to a printed circuit board of a power supply;

FIG. 31 is an enlarged partial cross-sectional side view of the flexible circuit board of FIG. 29 with the bond pad holes positioned near the edge and soldered to the printed circuit board of the power supply;

FIG. 32 is a diagram showing a pad structure with notches on a pad of a flexible circuit board according to an embodiment of the present invention;

FIG. 33 shows a side sectional partial enlarged view taken along line A-A' of FIG. 32;

FIG. 34 is a diagram showing a structure of soldering a flexible circuit board to a printed circuit board of a power supply according to an embodiment of the present invention;

fig. 35 shows a structure of a bonding head used for bonding a flexible circuit board and a printed circuit board of a power supply in an embodiment of the present invention.

FIG. 36 is a block diagram showing the combination of a flexible circuit board and a printed circuit board of a power supply according to another embodiment of the present invention;

FIG. 37 is a view showing a construction of a modification of FIG. 36;

FIG. 38 is a schematic view showing a transition portion of the lamp tube of FIG. 7;

FIG. 39 is a diagram showing a structure of a flexible circuit board before soldering with a printed circuit board of a power supply according to an embodiment of the present invention;

FIG. 40 shows a diagram of a soldering carrier structure for soldering a flexible circuit board to a printed circuit board of a power supply according to an embodiment of the present invention;

fig. 41 is a view showing a structure of the flexible circuit board of fig. 39 after soldering with a printed circuit board of a power supply.

Detailed Description

The inventor of the present invention has made creative efforts to propose a new LED straight tube lamp based on a glass tube to solve the problems mentioned in the background art and the above-mentioned problems.

In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

An embodiment of the present invention provides an LED straight tube lamp, referring to fig. 1-2, including: the lamp comprises a lamp tube 1, a lamp panel 2 arranged in the lamp tube 1 and two lamp caps 3 respectively arranged at two ends of the lamp tube 1. Wherein the lamp tube 1 can be a plastic lamp tube or a glass lamp tube, and the glass lamp tube with a reinforced part is adopted in the embodiment, so that the problems that the traditional glass lamp tube is easy to crack and electric shock accidents caused by electric leakage due to the crack and the plastic lamp tube is easy to age are avoided.

The lamp tube strengthening mode can use chemical mode or physical mode to make secondary processing strengthening on glass, the basic principle of chemical mode is to change the composition of glass surface to raise glass strength, its method is to make other alkali metal ions exchange with Na ion or K ion on glass surface layer, and form ion exchange layer on surface, after cooling to normal temperature, the glass is in the state of inner layer being pulled and outer layer being compressed so as to attain the goal of raising strength.

1. High temperature ion exchange process

In a temperature region between a softening point and a transition point of glass, the glass containing Na2O or K2O is immersed into molten salt of lithium, na ions in the glass or Li ions in the molten salt with small radius are exchanged, and then the glass is cooled to room temperature, and the surface is strengthened by generating residual pressure due to the difference of expansion coefficients of a surface layer containing the Li ions and an inner layer containing the Na ions or the K ions; when the glass contains Al2O3, tiO2 and other components, the crystallization with extremely low expansion coefficient can be generated through ion exchange, and the cooled glass surface can generate great pressure, so that the glass with the strength as high as 700MPa can be obtained.

2. Low temperature ion exchange process

The low temperature ion exchange process uses monovalent cations (such as K ions) with a larger ionic radius than the alkali ions (such as Na ions) on the surface layer to exchange ions with Na ions in a temperature region lower than the strain point of the glass, so that the K ions enter the surface layer. For example, a Na2O+CaO+SiO2 system glass can be immersed in a molten salt of four hundred degrees for ten or more hours. The low-temperature ion exchange method can easily obtain high strength and has the characteristics of simple treatment method, no damage to the transparency of the glass surface, no deformation and the like.

3. Dealkalization method

The dealkalization method is to treat glass with Pt catalyst in high temperature atmosphere containing sulfurous acid gas and water to make Na+ ion ooze out from the glass surface layer to react with sulfurous acid, so that the surface layer becomes SiO 2-rich layer, and as a result, the surface layer becomes low expansion glass, compressive stress is generated during cooling

4. Surface crystallization method

The surface crystallization method is different from the high-temperature ion exchange method, but only a heat treatment is used to form microcrystals with a low expansion coefficient on the surface layer, thereby strengthening the surface layer.

5. Sodium silicate strengthening method

The sodium silicate strengthening method is to treat an aqueous solution of sodium silicate (water glass) at a temperature of 100 ℃ or more under several atmospheres, thereby obtaining high-strength glass with which the surface layer is hard to scratch.

Physical strengthening of the glass may include, but is not limited to, the use of coatings or altering the structure of the article. The type and state of the coating are determined by the substrate to be sprayed, and the coating can be a ceramic tile strengthening coating, an acrylic coating, a glass coating or the like, and can be liquid or gas during coating. The structure of the article is altered, for example, by structural reinforcement design where it is subject to breakage. The above-mentioned chemical means or physical means are not limited to a single means, and any combination of the chemical means and the physical means may be mixed.

In this embodiment, the lamp 1 includes a main body 102 and end portions 101 at two ends of the main body 102, and the lamp cap 3 is sleeved outside the end portions 101. Wherein the outer diameter of at least one end portion 101 is smaller than the outer diameter of the body portion 102. In this embodiment, the outer diameters of the two end portions 101 are smaller than the outer diameter of the main body 102, and the cross section of the end portion 101 is a plane and parallel to the main body 102. Specifically, the two ends of the lamp tube 1 are treated by the strengthening part, the end part 101 forms a strengthening part structure, and the lamp cap 3 is sleeved on the strengthened end part 101, so that the difference between the outer diameter of the lamp cap 3 and the outer diameter of the main body part 102 of the lamp tube becomes smaller, and even is completely flat, i.e. the outer diameter of the lamp cap 3 is equal to the outer diameter of the main body part 102, and no gap is generated between the lamp cap 3 and the main body part 102. The advantage of setting up like this is that in the transportation, the packing bearing thing can not only contact lamp holder 3, and it can contact lamp holder 3 and fluorescent tube 1 simultaneously for whole LED straight tube lamp atress is even, and can not make lamp holder 3 become the only stress point, avoids lamp holder 3 and the position that fluorescent tube tip 101 is connected because the atress takes place to break, improves the quality of product, has pleasing to the eye effect concurrently.

In this embodiment, the outer diameter of the base 3 is substantially equal to the outer diameter of the main body 102, and the tolerance is within plus or minus 0.2mm (millimeters), and at most, no more than plus or minus 1mm.

In order to achieve the purpose that the outer diameter of the base 3 is substantially equal to the outer diameter of the main body 102, the difference between the outer diameters of the reinforced end portion 101 and the main body 102 may be 1mm to 10mm according to the thickness of the base 3; or more preferably, the difference between the outer diameters of the reinforced end portion 101 and the main body portion 102 may be widened to 2mm to 7mm.

In this embodiment, referring to fig. 3, a transition portion 103 is formed by smoothly transitioning between the end portion 101 and the main body portion 102 of the lamp tube 1, and both ends of the transition portion 103 are arc surfaces, i.e. both ends of the transition portion 103 are arc-shaped in cross section along the axial direction.

The length of the transition part 103 is 1 mm-4 mm, and if the length is less than 1mm, the strength of the transition part is insufficient; if it is larger than 4mm, the length of the main body 102 is reduced, the light emitting surface is reduced, and the length of the base 3 is required to be increased correspondingly to fit with the main body 102, resulting in an increase in the material of the base 3. In other embodiments, the transition 103 may not be arcuate. Referring to fig. 7 and 38, fig. 7 is a schematic structural diagram illustrating a connection between the lamp cap 3 and the lamp 1 according to an embodiment of the invention, and fig. 38 is a schematic structural diagram illustrating a transition portion 103 of the lamp 1 in fig. 7. As shown in fig. 7 and 38, in the present embodiment, the glass lamp tube 1 is adopted as the light tube, the transition portion 103 between the main body 102 and the end 101 is a slightly inverted S-shaped curved surface formed by two continuous curved surfaces with curvature radii r1 and r2, generally, the relationship between the curvature radii r1 and r2 of the two curved surfaces is that r1< r2, the ratio of r1 to r2 is 1:1.5-1:10, the preferred range is 1:2.5-1:5, and the preferred range is 1:3-1:4, so that the transition portion 103 (i.e. the transition portion 103 in the concave direction of the curved surface shown in fig. 38) near the end 101 is in a state of being pulled in an inner layer and being pressed in an outer layer after strengthening treatment, thereby achieving the purpose of increasing the strength of the transition portion 103 of the glass lamp tube 1. The transition portion 103 (i.e. the transition portion 103 with the concave arc surface in fig. 38) near the main body 102 is strengthened, so that the glass is in a state that the inner layer is pressed and the outer layer is pulled, thereby achieving the purpose of increasing the strength of the transition portion 103 of the glass lamp tube 1.

Taking the standard lamp tube of T8 as an example, the outer diameter of the reinforced end portion 101 ranges from 20.9mm to 23mm, and if it is smaller than 20.9mm, the inner diameter of the end portion 101 is too small, so that the power supply part cannot be inserted into the lamp tube 1. The outer diameter of the main body 102 ranges from 25mm to 28mm, and if the outer diameter is less than 25mm, the reinforcing parts at both ends are inconvenient to treat under the existing process conditions, and if the outer diameter is more than 28mm, the industrial standard is not met.

With continued reference to fig. 2, the lamp panel 2 is provided with a plurality of light sources 202, the lamp cap 3 is provided with a power supply 5, and the light sources 202 are electrically communicated with the power supply 5 through the lamp panel 2.

Wherein, the power supply 5 can be a single body (i.e. all power supply components are integrated in one component) and is arranged in the lamp cap 3 at one end of the lamp tube 1; alternatively, the power supply 5 may be divided into two parts, called a double body (i.e. all power supply components are respectively arranged in two parts), and the two parts are respectively arranged in the lamp caps 3 at both ends of the lamp tube. If only one end of the lamp tube 1 is treated as the reinforcing portion, the power supply is preferably selected as a single body and is provided in the base 3 corresponding to the reinforced end portion 101.

The power supply can be formed in multiple modes, for example, the power supply can be a module after encapsulation molding, specifically, a high-heat-conductivity silica gel (the heat conductivity coefficient is more than or equal to 0.7 w/m.k) is used, and the power supply is obtained by encapsulation molding of a power supply component through a mold. Alternatively, the power supply can be formed without pouring sealant, and the exposed power supply component is directly placed inside the lamp cap, or the exposed power supply component is packaged by a traditional heat shrinkage tube and then placed inside the lamp cap 3.

Generally, referring to fig. 2 in combination with fig. 4-6, the power supply 5 has a male pin 501 at one end and a metal pin 502 at the other end, the lamp panel 2 has a female pin 201 at its end, and the lamp cap 3 has a hollow conductive pin 301 for connecting to an external power supply. The male plug 501 of the power supply 5 is inserted into the female plug 201 of the lamp panel 2, and the metal pin 502 is inserted into the hollow conductive pin 301 of the lamp cap 3. The male plug 501 and the female plug 201 are equivalent to an adapter for electrically connecting the power supply 5 and the lamp panel 2. After the metal pins 502 are inserted into the hollow conductive pins 301, the hollow conductive pins 301 are impacted by an external punching tool, so that the hollow conductive pins 301 are slightly deformed, thereby fixing the metal pins 502 on the power supply 5 and realizing electrical connection.

When energized, current passes through hollow conductive pin 301, metal pin 502, male pin 501, and female pin 201 in order to light panel 2, and through light panel 2 to light source 202. In other embodiments, the connection mode of the male plug 501 and the female plug 201 may be replaced by a traditional wire bonding mode, that is, a traditional metal wire is adopted to electrically connect one end of the metal wire with the power supply and the other end of the metal wire with the lamp panel 2, but the wire bonding mode may have a problem of breakage in the transportation process and is slightly inferior in quality. In other embodiments, the power supply 5 may be disposed on a printed circuit board and electrically connected to the lamp panel 2 by the connection method of the male plug 501 and the female plug 201 or by wire bonding, and the structure of the power supply 5 is not limited to the modularized form shown in fig. 6.

In order to facilitate the connection and fixation of the lamp cap 3 and the lamp tube 1, this embodiment is improved with respect to the lamp cap 3.

Referring to fig. 4-5 in combination with fig. 7-9, when the lamp cap 3 is sleeved outside the lamp tube 1, the lamp cap 3 is sleeved outside the end portion 101 and extends to the transition portion 103 to partially overlap with the transition portion 103.

The base 3 includes an insulating tube 302 in addition to a hollow conductive pin 301, and a heat conducting portion 303 fixedly provided on the outer peripheral surface of the insulating tube 302, wherein the hollow conductive pin 301 is provided on the insulating tube 302. One end of the heat conducting portion 303 protrudes from the end of the insulating tube 302 facing the lamp tube, and the protruding portion (portion protruding from the insulating tube) of the heat conducting portion 303 and the lamp tube 1 are bonded by the hot melt adhesive 6. In this embodiment, the lamp cap 3 extends to the transition portion 103 through the heat conducting portion 303, and by the close contact between the heat conducting portion 303 and the transition portion 103, when the heat conducting portion 303 and the lamp tube 1 are adhered by the hot melt adhesive 6, the hot melt adhesive 6 does not overflow the lamp cap 3 and remain on the main body 102 of the lamp tube 1, and furthermore, the end of the insulating tube 302 facing the lamp tube 1 does not extend to the transition portion 103, i.e. there is a space between the end of the insulating tube 302 facing the lamp tube and the transition portion 103. In the present embodiment, the insulating tube 302 is not limited to a plastic material, a ceramic material, or the like, as long as it is not a good conductor of electricity in a general state.

The hot melt adhesive 6 (comprising a material that is a welding mud powder) preferably comprises the following components: phenolic resin 2127#, shellac, rosin, calcite powder, zinc oxide, ethanol and the like. In this example, rosin is an adhesion promoter that is ethanol soluble but water insoluble. The hot melt adhesive 6 can change the physical state of the hot melt adhesive under the condition of high-temperature heating to greatly expand so as to achieve the curing effect, and the adhesion of the material can enable the lamp cap 3 to be in close contact with the lamp tube 1, so that the LED straight tube lamp can be automatically produced. In this embodiment, the hot melt adhesive 6 expands and flows after being heated at high temperature, and then is cooled to achieve the curing effect. The hot melt adhesive 6 of the invention can not cause the reliability to be reduced because of the high temperature environment formed by the heating elements such as a power supply component and the like, can prevent the bonding performance of the lamp tube 1 and the lamp cap 3 from being reduced in the use process of the LED straight tube lamp, and improves the long-term reliability.

Specifically, an accommodating space is formed between the inner peripheral surface of the protruding portion of the heat conducting portion 303 and the outer peripheral surface of the lamp tube 1, and the hot melt adhesive 6 is filled in the accommodating space (the position indicated by a broken line B in fig. 7). In other words, the hot-melt adhesive 6 is filled in a position passing through a first virtual plane (a plane shown by a broken line B in fig. 7) perpendicular to the axial direction of the lamp tube 1: in a radially inward direction, at the position of the first virtual plane, the heat conductive portion 303, the hot melt adhesive 6, and the outer peripheral surface of the lamp tube 1 are sequentially arranged. The hot melt adhesive 6 may be coated to a thickness of 0.2mm to 0.5mm, and the hot melt adhesive 6 is cured after being expanded so as to contact the lamp vessel 1 and fix the lamp cap 3 to the lamp vessel 1. And because the height difference is arranged between the outer peripheral surfaces of the end part 101 and the main body part 102, the hot melt adhesive can be prevented from overflowing to the main body part 102 of the lamp tube, the subsequent manual wiping process is avoided, and the yield of the LED straight lamp tube is improved.

During processing, heat is conducted to the heat conducting part 303 through an external heating device, then conducted to the hot melt adhesive 6, and the hot melt adhesive 6 is expanded and then solidified, so that the lamp cap 3 is fixedly adhered to the lamp tube 1.

In this embodiment, as shown in fig. 7, the insulating tube 302 includes a first tube 302a and a second tube 302b connected in the axial direction, the outer diameter of the second tube 302b is smaller than that of the first tube 302a, and the difference between the outer diameters of the two tubes is in the range of 0.15mm to 0.3mm. The heat conduction portion 303 is arranged on the outer peripheral surface of the second tube 302b, and the outer surface of the heat conduction portion 303 is flush with the outer peripheral surface of the first tube 302a, so that the outer surface of the lamp cap 3 is smooth, and the uniform stress of the whole LED straight tube lamp in the packaging and transportation processes is ensured. The ratio of the length of the heat conducting portion 303 along the axial direction of the lamp cap to the axial length of the insulating tube 302 is 1:2.5-1:5, namely the length of the heat conducting portion: the length of the insulating tube is 1:2.5-1:5.

In this embodiment, in order to ensure the firmness of the adhesion, the second tube 302b is at least partially sleeved outside the lamp tube 1, and the accommodating space further includes a space between the inner surface of the second tube 302b and the outer surface of the end 101 of the lamp tube. The hot melt adhesive 6 is partially filled between the second tube 302b and the lamp vessel 1 which overlap each other (the position shown by the dotted line a in fig. 7), i.e., a portion of the hot melt adhesive 6 is located between the inner surface of the second tube 302b and the outer surface of the end portion 101. In other words, the position of the hot melt adhesive 6 filled in the accommodating space is defined by a second virtual plane (a plane shown by a dotted line a in fig. 7) perpendicular to the axial direction of the lamp tube: in a radially inward direction, at the position of the second virtual plane, the heat conduction portion 303, the second tube 302b, the hot melt adhesive 6, and the end portion 101 are arranged in this order. In this embodiment, the hot melt adhesive 6 does not need to completely fill the accommodating space (the accommodating space may also include a space between the heat conducting portion 303 and the second tube 302 b). When the hot melt adhesive 6 is applied between the heat conducting portion 303 and the end portion 101 at the time of manufacture, the amount of the hot melt adhesive may be appropriately increased so that the hot melt adhesive can flow between the second pipe 302b and the end portion 101 due to expansion during the subsequent heating, and after curing, the two are further adhesively connected.

Wherein, after the end 101 of the lamp tube 1 is inserted into the lamp cap 3, the axial length of the portion of the end 101 of the lamp tube 1 inserted into the lamp cap 3 is between one third and two thirds of the axial length of the heat conducting portion 303, which has the following advantages: on one hand, the hollow conductive needle 301 and the heat conducting part 303 are ensured to have enough creepage distance, and the hollow conductive needle 301 and the heat conducting part 303 are not easy to be short-circuited when electrified, so that people are not shocked to cause danger; on the other hand, due to the insulation effect of the insulation tube 302, the creepage distance between the hollow conductive needle 301 and the heat conducting portion 303 is increased, and it is easier to cause a dangerous test by an electric shock of a person at a high voltage.

Further, for the hot melt adhesive 6 on the inner surface of the second tube 302b, the second tube 302b is spaced between the hot melt adhesive 6 and the heat conducting portion 303, so that the effect of heat conduction from the heat conducting portion 303 to the hot melt adhesive 6 is impaired. Therefore, referring to fig. 5, in the present embodiment, a plurality of notches 302c are disposed at an end of the second tube 302b facing the lamp tube 1 (i.e. an end far from the first tube 302 a), so as to increase the contact area between the heat conducting portion 303 and the hot melt adhesive 6, thereby facilitating the heat to be quickly conducted from the heat conducting portion 303 to the hot melt adhesive 6 and accelerating the curing process of the hot melt adhesive 6. Meanwhile, when a user touches the heat conducting part 303, electric shock is not generated due to breakage of the lamp tube 1 due to the insulation effect of the hot melt adhesive 6 between the heat conducting part 303 and the lamp tube 1.

The heat conducting portion 303 may be made of various materials that are easy to conduct heat, and in this embodiment, is made of metal sheet, and has aesthetic considerations, such as aluminum alloy. The heat conducting portion 303 is tubular (or annular) and is sleeved outside the second pipe 302 b. The insulating tube 302 may be made of various insulating materials, but is preferably not easy to conduct heat, so that heat is prevented from being conducted to the power supply component inside the lamp cap 3, and the performance of the power supply component is prevented from being affected, and the insulating tube 302 in the embodiment is a plastic tube.

In other embodiments, the heat conducting part 303 may be composed of a plurality of metal sheets arranged at intervals or not at intervals along the circumference of the second tube 302 b.

In other embodiments, the lighthead may also be provided in other forms, such as:

referring to fig. 8 to 9, the base 3 includes a magnetic conductive metal member 9 in addition to the insulating tube 302, and does not include a heat conductive portion. The magnetic conductive metal member 9 is fixed on the inner peripheral surface of the insulating tube 302, and is at least partially located between the inner peripheral surface of the insulating tube 302 and the end portion of the lamp tube, and has an overlapping portion with the lamp tube 1 in the radial direction.

In this embodiment, the whole magnetically conductive metal member 9 is disposed in the insulating tube 302, and the hot melt adhesive 6 is coated on the inner surface of the magnetically conductive metal member 9 (the surface of the magnetically conductive metal member 9 facing the lamp tube 1) and is adhered to the outer peripheral surface of the lamp tube 1. Wherein, in order to increase the bonding area and improve the bonding stability, the hot melt adhesive 6 covers the whole inner surface of the magnetic conductive metal piece 9.

In manufacturing, the insulating tube 302 is inserted into an induction coil 11 such that the induction coil 11 is opposite to the magnetically conductive metal member 9 in the radial direction of the insulating tube 302. During processing, the induction coil 11 is electrified, an electromagnetic field is formed after the induction coil 11 is electrified, the electromagnetic field is converted into current after passing through the magnetic conduction metal piece 9, the magnetic conduction metal piece 9 heats, namely, an electromagnetic induction technology is used for heating the magnetic conduction metal piece 9, heat is conducted to the hot melt adhesive 6, the hot melt adhesive 6 expands and flows after absorbing the heat, and then the hot melt adhesive 6 is solidified after being cooled, so that the purpose of fixing the lamp cap 3 on the lamp tube 1 is achieved. The induction coil 11 is coaxial with the insulating tube 302 as much as possible, so that the energy transfer is relatively uniform. In this embodiment, the deviation between the induction coil 11 and the central axis of the insulating tube 302 is not more than 0.05mm. When the bonding is completed, the lamp 1 is pulled away from the induction coil 11. In this embodiment, the hot melt adhesive 6 expands and flows after absorbing heat, and then cools to achieve the curing effect, however, the hot melt adhesive component of the present invention is not limited thereto, and the component that cures after absorbing heat may be selected. Or, in other embodiments, the magnetic conductive metal piece 9 is not required to be additionally disposed on the lamp cap 3, and only the predetermined proportion of the high magnetic conductive material powder, such as iron, nickel, iron-nickel mixture, etc., is directly doped into the hot melt adhesive 6, or the high magnetic conductive material powder is used to replace part of the calcite powder, that is, the occupied volume ratio of the high magnetic conductive material powder to the calcite powder is about 1:3-1:1, so that after the lamp cap 3 and the lamp tube 1 are bonded by the hot melt adhesive 6, the breaking test of the lamp cap can be passed, the bending moment test standard of the lamp cap and the torque test standard of the lamp cap can be simultaneously met, in general, the bending moment test standard of the lamp cap of the straight lamp tube needs to be greater than 5 newton-meters (Nt-m), the torque test standard of the lamp cap of the straight lamp tube needs to be greater than 1.5 newton-meters (Nt-m), and the embodiment can pass the bending moment test of 5-10 newton-meters (Nt-m) and the torque test of 1.5 newton-5 newton-m (Nt-m) of the magnetic flux of the straight lamp tube lamp according to the different proportions of the high magnetic conductive material powder doped to the hot melt adhesive 6 and the different magnetic fluxes applied to the lamp cap. During processing, the induction coil 11 is electrified, after the induction coil 11 is electrified, high magnetic permeability material powder uniformly distributed in the hot melt adhesive 6 is electrified, so that the hot melt adhesive 6 heats, the hot melt adhesive 6 absorbs heat and expands and flows, and then the lamp holder 3 is fixed on the lamp tube 1 by cooling and solidifying. In addition, after the manufacturing process of the lamp 1 is completed, the induction coil 11 is not moved, and then the lamp 1 is pulled away from the induction coil 11, however, in other embodiments, the lamp 1 may be not moved, and then the induction coil 11 is separated from the lamp, in this embodiment, the heating apparatus may be a device with a plurality of induction coils 11, that is, when the lamp cap 3 of the plurality of lamps 1 is to be heated, only the plurality of lamps 1 need to be placed at the default position, then the heating apparatus moves the corresponding induction coils 11 to the position of the lamp cap to be heated to heat the lamp 1, and after the heating is completed, the plurality of induction coils 11 are pulled away from the corresponding lamp cap 1 to complete the lamp heating process. It should be noted that, as shown in fig. 8, the induction coil 11 in the present embodiment may be formed in a shape similar to the induction coil 11 by using a clamp having a semicircular shape, without using a ring-shaped coil structure, and the same effect is achieved.

In order to better support the magnetically conductive metal piece 9, the inner diameter of the portion 302d of the inner peripheral surface of the insulating tube 302 for supporting the magnetically conductive metal piece 9 is larger than the inner diameter of the rest 302e, and a step is formed, one axial end of the magnetically conductive metal piece 9 abuts against the step, and after the magnetically conductive metal piece 9 is arranged, the inner surface of the whole lamp cap is flush. The magnetically conductive metal member 9 may have various shapes, for example, a sheet shape, a tube shape, or the like arranged in the circumferential direction, and the magnetically conductive metal member 9 is provided in a tube shape coaxial with the insulating tube 302.

In other embodiments, the portion of the inner peripheral surface of the insulating tube 302 for supporting the magnetically conductive metal member 9 may be as follows: referring to fig. 10 and 11, the insulating tube 302 has a support portion 313 protruding toward the inside of the insulating tube 302 on the inner peripheral surface thereof, and a convex portion 310 is further provided on the inner peripheral surface of the insulating tube 302 on the side of the support portion 313 facing the lamp body portion, and the radial thickness of the convex portion 310 is smaller than the radial thickness of the support portion 313. As shown in fig. 11, the protruding portion 310 of the present embodiment is connected to the supporting portion 313 in the axial direction, and the magnetically conductive metal member 9 abuts against the upper edge of the supporting portion 313 (i.e., the end surface of the supporting portion facing the protruding portion) in the axial direction and abuts against the radially inner side of the protruding portion 310 in the circumferential direction. That is, at least a part of the convex portion 310 is located between the magnetically conductive metal member 9 and the inner peripheral surface of the insulating tube 302. The protruding portion 310 may be a ring shape extending along the circumferential direction of the insulating tube 302 or a plurality of protruding portions arranged at intervals along the circumferential direction around the inner circumferential surface of the insulating tube 302, in other words, the protruding portions may be arranged at equal intervals or at unequal intervals along the circumferential direction, so long as the contact area between the outer surface of the magnetic conductive metal member 9 and the inner circumferential surface of the insulating tube 302 is reduced, and the function of holding the hot melt adhesive 6 is achieved.

The thickness of the supporting portion 313 protruding inward from the inner circumferential surface of the insulating tube 302 is 1mm to 2mm, the thickness of the protruding portion 310 is smaller than the thickness of the supporting portion 313, and the thickness of the protruding portion 310 is 0.2mm to 1mm.

In other embodiments, the lamp cap 3 may be made of all metal, and an insulator needs to be added at the lower part of the hollow conductive pin to resist high voltage.

In other embodiments, referring to fig. 12, fig. 12 is a view of the magnetically conductive metal member 9 along a radial direction, the surface of the magnetically conductive metal member 9 facing the insulating tube has at least one hollow structure 901, and the hollow structure 901 is circular, but not limited to, and may be, for example, elliptical, square, star-shaped, etc., so long as the contact area between the magnetically conductive metal member 9 and the inner peripheral surface of the insulating tube 302 can be reduced, and the function of thermosetting, i.e., the hot melt adhesive 6 can be achieved. Preferably, the area of the hollow hole structure 901 accounts for 10% -50% of the area of the magnetic conductive metal piece 9. The arrangement of the hollow structures 901 may be circumferentially equidistantly spaced or non-equidistantly spaced.

In other embodiments, referring to fig. 13, the surface of the magnetically conductive metal member 9 facing the insulating tube has an indentation 903, where fig. 13 is a view of the magnetically conductive metal member 9 along a radial direction, the indentation 903 may be a structure embossed from an inner surface to an outer surface of the magnetically conductive metal member 9, but may also be a structure embossed from an outer surface to an inner surface of the magnetically conductive metal member 9, for the purpose of forming a protrusion or a recess on the outer surface of the magnetically conductive metal member 9 to reduce a contact area between the outer surface of the magnetically conductive metal member 9 and the inner circumferential surface of the insulating tube 302. However, it should be noted that the magnetic conductive metal piece 9 should be bonded with the lamp tube stably to achieve the function of thermosetting the hot melt adhesive 6.

In this embodiment, referring to fig. 14, the magnetically conductive metal member 9 is a circular ring. In other embodiments, referring to fig. 15, the magnetically conductive metal member 9 is a non-circular ring, such as but not limited to an oval ring, and when the lamp tube 1 and the lamp cap 3 are oval, the minor axis of the oval ring is slightly larger than the outer diameter of the end of the lamp tube, so as to reduce the contact area between the outer surface of the magnetically conductive metal member 9 and the inner peripheral surface of the insulating tube 302, but to achieve the function of heat curing the hot melt adhesive 6. In other words, the inner peripheral surface of the insulating tube 302 has the supporting portion 313, and the non-circular ring-shaped magnetically conductive metal member 9 is provided on the supporting portion, so that the contact area between the magnetically conductive metal member 9 and the inner peripheral surface of the insulating tube 302 can be reduced, and the function of curing the hot melt adhesive 6 can be achieved.

With continued reference to fig. 2, the LED straight tube lamp of the present embodiment further includes an adhesive sheet 4, a lamp panel insulating sheet 7, and a light source sheet 8. The lamp panel 2 is adhered to the inner peripheral surface of the lamp tube 1 by an adhesive sheet 4. The adhesive sheet 4 may be silica gel, and may be several pieces as shown in the drawings, or a long piece, without limitation.

The lamp panel insulating film 7 is coated on the surface of the lamp panel 2 facing the light source 202 so that the lamp panel 2 is not exposed, thereby playing an insulating role in isolating the lamp panel 2 from the outside. The through holes 701 corresponding to the light sources 202 are reserved during gluing, and the light sources 202 are arranged in the through holes 701. The lamp panel insulating film 7 comprises vinyl polysiloxane, hydrogen polysiloxane and aluminum oxide. The thickness of the lamp panel insulating film 7 ranges from 100 μm to 140 μm (micrometers). If it is less than 100. Mu.m, the insulation effect is insufficient, and if it is more than 140. Mu.m, the waste of material is caused.

The light source film 8 is coated on the surface of the light source 202. The color of the light source film 8 is transparent to ensure light transmittance. After being applied to the surface of the light source 202, the shape of the light source film 8 may be granular, strip-like or sheet-like. Among these parameters of the light source film 8 are refractive index, thickness, etc. The allowable range of the refractive index of the light source film 8 is 1.22-1.6, and if the refractive index of the light source film 8 is the open root number of the refractive index of the light source 202 shell, or the refractive index of the light source film 8 is plus or minus 15% of the open root number of the refractive index of the light source 202 shell, the light transmittance is better. The light source housing herein refers to a housing that accommodates the LED die (or chip). In this embodiment, the refractive index of the light source film 8 ranges from 1.225 to 1.253. The light source film 8 allows a thickness range of 1.1mm to 1.3mm, and if it is less than 1.1mm, the light source 202 will not be covered, and if it is more than 1.3mm, the light transmittance will be reduced, and the material cost will be increased.

When in assembly, the light source film 8 is coated on the surface of the light source 202; then, the lamp panel insulating film 7 is coated on one side surface of the lamp panel 2; fixing the light source 202 on the lamp panel 2; then, the surface of the lamp panel 2 opposite to the light source 202 is stuck and fixed on the inner peripheral surface of the lamp tube 1 through the adhesive sheet 4; finally, the lamp cap 3 is fixed to the end of the lamp tube 1, and the light source 202 is electrically connected to the power supply 5. Either the flexible circuit board is used to climb over the transition portion 103 and the power supply is welded (i.e. the flexible circuit board is welded with the power supply 5 through the transition portion 103) as shown in fig. 16, or the lamp panel 2 is electrically connected with the power supply 5 by adopting a traditional wire bonding mode, and finally the lamp cap 3 is connected with the transition portion 103 subjected to strengthening treatment in a mode of fig. 7 (with the structure of fig. 4-5) or fig. 8 (with the structure of fig. 9) to form a complete LED straight tube lamp.

In this embodiment, the lamp panel 2 is fixed on the inner peripheral surface of the lamp tube 1 by the adhesive sheet 4, so that the lamp panel 2 is attached to the inner peripheral surface of the lamp tube 1, thus increasing the light emitting angle of the whole LED straight tube lamp, and enlarging the viewing angle, and the viewing angle can generally exceed 330 degrees. By coating the lamp panel 2 with the lamp panel insulating film 7 and coating the light source 202 with the insulating light source film 8, the insulation treatment of the whole lamp panel 2 is realized, so that even if the lamp tube 1 breaks, electric shock accidents can not occur, and the safety is improved.

Further, the lamp board 2 may be any one of a strip-shaped aluminum substrate, an FR4 board, or a flexible circuit board. Because the lamp tube 1 in this embodiment is a glass lamp tube, if the lamp panel 2 adopts a rigid strip-shaped aluminum substrate or FR4 board, when the lamp tube is broken, for example, into two sections, the whole lamp tube can still be kept in a straight tube state, and at this time, a user may consider that the LED straight tube lamp can be used and self-installed, which is easy to cause an electric shock accident. Because the flexible circuit board has strong flexibility and pliable characteristic, solves the situation that the flexibility and the bendability of the rigid strip-shaped aluminum substrate and the FR4 board are insufficient, the lamp board 2 of the embodiment adopts the flexible circuit board, and thus when the lamp tube 1 is broken, the broken lamp tube 1 can not be supported to be kept in a straight tube state after the broken lamp tube 1 is broken, so as to inform a user that the LED straight tube lamp can not be used, and avoid electric shock accidents. Therefore, when the flexible circuit board is adopted, the electric shock problem caused by the breakage of the glass tube can be relieved to a certain extent. The following embodiments describe the flexible circuit board as the light board 2 of the present invention.

The power supply 5 may also be a printed circuit board with a power component mounted on a single piece, the input end of the printed circuit board has a metal pin 502 connected with the lamp cap, and the output end of the other side may be provided with a male plug, an electrical metal connection hole or a bonding pad according to the connection mode with the flexible circuit board 2. The separated flexible circuit board 2 and the output end of the power supply 5 can be connected with the female plug 201 through the male plug 501, or connected by wire bonding, and the outer layer of the wire can wrap an insulating sleeve for electrical insulation protection. In addition, the output ends of the flexible circuit board 2 and the power supply 5 can be directly connected together by riveting, solder paste bonding, welding or wire binding. In accordance with the fixing manner of the lamp panel 2, one side surface of the flexible circuit board is adhered and fixed to the inner peripheral surface of the lamp tube 1 by the adhesive sheet 4, and both ends of the flexible circuit board may be optionally fixed to the inner peripheral surface of the lamp tube 1.

If the two ends of the flexible circuit board 2 along the axial direction of the lamp tube 1 are not fixed on the inner peripheral surface of the lamp tube 1, if the wires are connected, the wires are likely to break because the two ends are free in the subsequent moving process and shake easily in the subsequent moving process. Therefore, the connection mode between the flexible circuit board 2 and the power supply 5 is preferably selected to be welding, specifically, referring to fig. 16, the flexible circuit board 2 can be directly climbed over the transition portion 103 of the reinforcement portion structure and then welded on the output end of the power supply 5, so that the use of wires is avoided, and the stability of the product quality is improved. At this time, the flexible circuit board 2 does not need to be provided with the female plug 201, and the output end of the power supply 5 does not need to be provided with the male plug 501, which may be specifically implemented by leaving the power supply pad a at the output end of the power supply 5, and leaving tin on the power supply pad a to increase the thickness of tin on the pad, so that the welding is convenient, and correspondingly, leaving the light source pad b at the end of the flexible circuit board 2, and welding the power supply pad a at the output end of the power supply 5 and the light source pad b of the flexible circuit board 2 together. When the plane where the bonding pad is located is defined as the front surface, the connection mode of the flexible circuit board 2 and the power supply 5 is that the bonding pads on the front surfaces are most firmly butted, but the welding pressure head must be pressed on the back surface of the flexible circuit board 2 during welding, and the welding tin is heated by the flexible circuit board 2, so that the problem of reliability is relatively easy to occur. If a hole is formed in the middle of the light source bonding pad b on the front side of the flexible circuit board 2, and then the light source bonding pad b is overlapped on the power source bonding pad a on the front side of the power source 5 to be welded, the welding pressure head can directly heat and melt soldering tin, and the welding pressure head is easy to realize practical operation.

As shown in fig. 24, the light source pad b of the flexible circuit board 2 is two non-connected pads, which are electrically connected with the positive and negative poles of the light source 202 respectively, the size of the pad is about 3.5×2mm2, the corresponding pad is also arranged on the printed circuit board of the power source 5, the reserved tin is arranged above the pad for being convenient for the automatic welding of the welding machine, the thickness of the tin can be 0.1-0.7 mm, preferably 0.3-0.5 mm, more preferably 0.4 mm. An insulation hole c can be arranged between the two welding pads to avoid electrical short circuit caused by welding of the welding pads together in the welding process, and a positioning hole d can be arranged behind the insulation hole c to enable an automatic welding machine to accurately judge the correct position of the light source welding pad b.

The light source pad b of the flexible circuit board has at least one bonding pad, and is electrically connected with the anode and the cathode of the light source 202 respectively. In other embodiments, the number of light source pads b may have more than one pad, such as 1, 2, 3, 4 or more than 4 pads, for compatibility and scalability for subsequent use. When the number of the welding pads is 1, the two corresponding ends of the flexible circuit board are respectively and electrically connected with the power supply to form a loop, and the electronic component can be replaced by an inductance instead of a capacitance to be used as a current stabilizing component. As shown in fig. 25 to 28, when the number of pads is 3, the 3 rd pad may be used as a ground, and when the number of pads is 4, the 4 th pad may be used as a signal input terminal. Correspondingly, the power supply pads a also have the same number of bonding pads as the light source pads b. When the number of the bonding pads is more than 3, the bonding pads can be arranged in a row or two rows, and the bonding pads are arranged at proper positions according to the size of the accommodating area in actual use, so long as the bonding pads are not electrically connected with each other to cause short circuit. In other embodiments, if part of the circuit is fabricated on the flexible circuit board, the light source pad b may have only one pad, and the fewer the number of pads, the more flow is saved in terms of process; the more the number of pads, the more the electrical connection and fixation between the flexible circuit board and the power output terminal are enhanced.

As shown in fig. 29, in other embodiments, the bonding pad of the light source bonding pad b may have a structure with a bonding hole e, wherein the bonding hole e may have a diameter of 1-2 mm, preferably 1.2-1.8 mm, and most preferably 1.5mm, and the bonding tin is not easy to pass through when too small. When the power source pad a of the power source 5 is soldered with the light source pad b of the flexible circuit board 2, the solder for soldering can pass through the soldering perforation e, and then is stacked above the soldering perforation e to be cooled and condensed, so as to form a solder ball structure g with a diameter larger than that of the soldering perforation e, and the solder ball structure g can function as a nail, besides being fixed through the tin between the power source pad a and the light source pad b, the stability of the electrical connection can be enhanced due to the action of the solder ball structure g.

In other embodiments, as shown in fig. 30 to 33, when the distance between the soldering hole e of the light source pad b and the edge of the flexible circuit board 2 is less than or equal to 1mm, solder is deposited on the edge above the hole e through the hole e, and excessive solder is reflowed from the edge of the flexible circuit board 2 to the lower side and then is condensed with the solder on the power source pad a, so that the structure is just like a rivet to firmly pin the flexible circuit board 2 on the circuit board of the power source 5, and the reliable electrical connection function is provided. In addition, the diameter of the welding perforation e is too small to prevent tin from passing through the hole, so that the welding perforation e of the light source bonding pad b can be directly changed into a welding notch f, the welding tin is used for electrically connecting and fixing the power source bonding pad a and the light source bonding pad b through the welding notch f, the tin is easier to climb up the light source bonding pad b to be accumulated around the welding notch f, more tin forms a welding ball with the diameter larger than that of the welding notch f after cooling and condensing, and the fixing capability of the electric connection structure is enhanced by the welding ball structure.

In other embodiments, the bonding pad has a bonding notch at the edge, and the bonding tin electrically connects and fixes the power pad a and the light source pad b through the bonding notch, and the tin is accumulated around the bonding notch, and after cooling, a solder ball having a diameter larger than that of the bonding notch is formed, and the solder ball structure forms a structural electrical connection fixing enhancement.

The structure described in this embodiment can be achieved either by forming the solder pad through the solder hole first or by directly punching the solder pad through the solder head during the soldering process. The surface of the welding pressure head, which is contacted with the soldering tin, can be a plane or a surface with concave parts and convex parts, the convex parts can be strip-shaped or grid-shaped, the convex parts incompletely cover the through holes, so that the soldering tin can pass through the through holes, and when the soldering tin passes through the welding through holes to be accumulated around the welding through holes, the concave parts can provide accommodating positions of the solder balls. In other embodiments, the flexible circuit board 2 has a positioning hole, and the bonding pads of the power source pad a and the light source pad b can be precisely positioned through the positioning hole during soldering.

In the above embodiment, most of the flexible circuit board 2 is fixed on the inner peripheral surface of the lamp tube 1, only the two ends of the flexible circuit board 2 are not fixed on the inner peripheral surface of the lamp tube 1, the flexible circuit board 2 not fixed on the inner peripheral surface of the lamp tube 1 forms a free portion 21, when assembled, one end of the free portion 21 welded with the power supply 5 drives the free portion 21 to shrink towards the inside of the lamp tube 1, the free portion 21 of the flexible circuit board 2 deforms due to shrinkage, the side of the flexible circuit board 2 with the light source and the power supply pad a welded with the power supply 5 face the same side, when the free portion 21 of the flexible circuit board 2 deforms due to shrinkage, one end of the flexible circuit board 2 welded with the power supply 5 has a lateral tension to the power supply 5, compared with the welding method that one side of the flexible circuit board 2 with the light source 202 and the power supply pad a welded with the power supply 5 face the different sides, the flexible circuit board 2 and one end of the flexible circuit board 5 also have a better tensile force to the flexible circuit board 2 welded with the power supply 5 face the same side, the flexible circuit board 2 is connected with the flexible circuit board with the upper through hole, and the flexible circuit board is better in the fixing effect. In this embodiment, the light source pad b of the flexible circuit board 2 is located at the other side of the flexible circuit board 2 having the light source, and the light source pad b of the flexible circuit board 2 and the power source pad a welded by the power source 5 are welded and fixed correspondingly. When assembled, the free portion 21 of the flexible circuit board 2 is contracted and deformed toward the inside of the lamp tube 1, and the free portion 21 deformed by the force is located on the same side of the flexible circuit board 2 as the light source.

The light source pad b of the flexible circuit board 2 and the power source pad a of the power source 5 are fixed by welding, and the perforation of the welding pad is formed firstly or is directly perforated by the welding pressure head 41 in the welding process, so that the structure described in the embodiment can be achieved. As shown in fig. 35, the welding ram 41 may be roughly divided into four regions: the pressure welding surface 4101, the diversion trench 4102, the tin forming groove 4103 and the pressing surface 4104, wherein the pressure welding surface 4101 is the surface actually contacted with the solder, the pressure and the heating source during welding are provided, the shape of the pressure welding surface can be a plane or the surface with concave parts and convex parts, the convex parts can be long-strip-shaped or grid-shaped, the convex parts can not completely cover the holes on the bonding pads, a plurality of arc-shaped concave diversion trenches 4102 are arranged at the lower edge part of the pressure welding surface 4101 in the middle of the welding pressure head 41, the main function is to ensure that the solder which is heated and melted by the pressure welding surface 4101 can flow into the holes or the gaps passing through the bonding pads from the concave diversion space, so the diversion trenches 4102 have the functions of diversion and stop (stopper), and the tin forming groove 4103 which is lower than the diversion trenches 4102 is arranged below the diversion trenches 4102 is the accommodating position for providing the solder to be the solder condensation solder balls when the solder passes through the holes or the gaps are piled around the surface. In addition, a plane slightly lower than the press-bonding surface 4101 on the periphery of the molding groove 4103 is a press-bonding surface 4104, and the difference between the height and the thickness of the press-bonding surface 4101 is the thickness of the flexible circuit board 2, so that the flexible circuit board 2 can be firmly pressed and fixed on the printed circuit board of the power supply 5 in the process of welding.

As shown in fig. 39 to 41 and referring to fig. 24 and 35 together, the flexible circuit board 2 and the printed circuit board of the power supply 5 also have corresponding bonding pads thereon, and tin is reserved above the bonding pads for facilitating automatic bonding of the bonding machine, and generally, the flexible circuit board 2 can be firmly bonded to the printed circuit board of the power supply 5 when the thickness of tin is preferably 0.3-0.5 mm. If the difference between the thicknesses of the reserved tin on the two bonding pads is too large as shown in fig. 39, in the process of bonding, the bonding head 41 will heat and melt one bonding pad when the reserved tin is first contacted, and the other reserved tin is melted to the same height and then is contacted by the bonding head 41, so that the bonding pad with the lower reserved tin thickness will always have a weak bonding condition, thereby affecting the electrical connection between the flexible circuit board 2 and the printed circuit board of the power supply 5. Therefore, the present embodiment applies the dynamic balance principle to solve this situation. In this embodiment, a linkage mechanism may be disposed on the apparatus of the welding press 41 to start the welding press 41 to be a rotatable mechanism, and when the welding press 41 contacts and detects that the pressure values of the reserved tin on the two pads are the same, the above-mentioned situation can be solved by applying and pressing.

In the above embodiment, the welding process is achieved by the dynamic balance principle of the welding press 41 of the rotary welding machine while the flexible circuit board 2 and the printed circuit board of the power supply 5 are not moved, and in other embodiments, as shown in fig. 40, the welding process is achieved by the dynamic balance principle of the welding press 41 being not moved while the flexible circuit board 2 is rotated. Firstly, the flexible circuit board 2 and the printed circuit board of the power supply 5 are placed in a carrier device 60, and the carrier device 60 comprises a lamp board carrier 61 for carrying the flexible circuit board 2 and the printed circuit board of the power supply 5, and a carrier bracket 62 for carrying the lamp board carrier 61. The lamp panel carrier 61 includes a rotation shaft 63 and two elastic components 64 respectively disposed at two sides of the rotation shaft for maintaining the lamp panel carrier 61 in a horizontal state when the lamp panel carrier 61 is empty. In this embodiment, the elastic components 64 are springs, one ends of the springs are respectively disposed on the carrier support 62 as supporting points, when the flexible circuit board 2 with the reserved tin having different thicknesses on both sides is placed on the lamp board carrier 61 shown in fig. 40, the lamp board carrier 61 is driven to rotate by the rotating shaft 63 until the welding press 41 detects that the pressure of the reserved tin on both sides is equal, and then the welding process is started, as shown in fig. 41, the elastic components 64 on both sides of the rotating shaft respectively have a subsequent pulling force and a subsequent pressure, after the welding process is completed, the driving force of the rotating shaft 63 is removed, and the lamp board carrier 61 is restored to the original horizontal state by the restoring force of the elastic components 64 on both sides of the rotating shaft 63. Of course, the lamp-board carrier 61 of the present embodiment can be achieved by other means, and the rotation shaft 63 and the elastic component 64 are not required, for example, a driving motor, an active rotation mechanism, etc. are built in the lamp-board carrier 61, and the carrier bracket 62 (the function of the elastic component 64 is fixed) is also not an essential component, so that the flexible circuit board 2 is driven to rotate by the dynamic balance principle to achieve the variation of the welding process, which does not depart from the scope of the present invention, and the following description is omitted.

If both ends of the flexible circuit board are fixed on the inner circumferential surface of the lamp tube 1, it is preferable to provide the female plug 201 on the flexible circuit board, and then insert the male plug 501 of the power supply 5 into the female plug 201 to achieve electrical connection.

As shown in fig. 17, the flexible circuit board includes a circuit layer 2a with a conductive effect, and the light source 202 is disposed on the circuit layer 2a and is electrically connected to the power supply through the circuit layer 2 a. Referring to fig. 17, in the present embodiment, the flexible circuit board may further include a dielectric layer 2b stacked on the circuit layer 2a, wherein the dielectric layer 2b and the circuit layer 2a have the same area, the circuit layer 2a is disposed on a surface opposite to the dielectric layer 2b for disposing the light source 202, and the dielectric layer 2b is adhered on an inner peripheral surface of the lamp tube 1 through the adhesive sheet 4 on the surface opposite to the circuit layer 2 a. The wiring layer 2a may be a metal layer or a power layer on which wires (e.g., copper wires) are wired.

In other embodiments, the outer surfaces of the circuit layer 2a and the dielectric layer 2b may be coated with a circuit protection layer, which may be an ink material, having the functions of solder resist and increasing reflection. Alternatively, the flexible circuit board may be a one-layer structure, that is, only composed of one circuit layer 2a, and then the surface of the circuit layer 2a is coated with a circuit protection layer made of the above-mentioned ink material. Either a one-layer wiring layer 2a structure or a two-layer structure (one-layer wiring layer 2a and one-layer dielectric layer 2 b) can be used together with the circuit protection layer. The circuit protection layer may be provided on one side surface of the flexible circuit board, for example, only on one side having the light source 202. It should be noted that the flexible circuit board has a one-layer circuit layer structure 2a or a two-layer structure (a circuit layer 2a and a dielectric layer 2 b), which is obviously more flexible and pliable than the conventional three-layer flexible substrate (a dielectric layer is sandwiched between two circuit layers), so that the flexible circuit board can be matched with the lamp tube 1 with a special shape (for example, a non-straight tube lamp), and can be tightly attached to the wall of the lamp tube 1. In addition, the flexible circuit board is attached to the wall of the lamp tube in a better configuration, and the fewer the number of layers of the flexible circuit board, the better the heat dissipation effect is, the lower the material cost is, the more environment-friendly is, and the flexibility effect is also improved.

Of course, the flexible circuit board of the present invention is not limited to one or two layers of circuit boards, and in other embodiments, the flexible circuit board includes a plurality of circuit layers 2a and a plurality of dielectric layers 2b, the dielectric layers 2b and the circuit layers 2a are sequentially stacked alternately and disposed on a side of the circuit layers 2a opposite to the light source 202, the light source 202 is disposed on an uppermost layer of the plurality of circuit layers 2a, and is electrically connected to a power source through the uppermost layer of the circuit layers 2 a. In other embodiments, the length of the flexible circuit board is greater than the length of the lamp tube.

In other embodiments, as shown in fig. 36 and 37, the flexible circuit board 2 and the power supply 5 fixed by soldering may be replaced by a long and short board 25. The long and short plates 25 have long plates 251 and short plates 253, and the long plates 251 and the short plates 253 are fixed by means of . The long board 251 may be the flexible circuit board 2 or the flexible substrate, and the short board 253 is made of a long board 251 to support the electronic component. The short plate 253 has a length of about 15 mm to 40 mm, preferably 19 mm to 36 mm, and the long plate 251 has a length of 800 mm to 2800 mm, preferably 1200 mm to 2400 mm. The ratio of the short plate 253 to the long plate 251 may be 1:20 to 1:200. The circuit layer 2a of the flexible circuit board 2 and the electronic component can be electrically connected in different ways according to practical use. As shown in fig. 36, the electronic component and the long board 251 (i.e. the circuit layer 2a of the flexible circuit board 2) are both located on the same side of the short board 253. As shown in fig. 37, the electronic component and the long board (i.e. the circuit layer 2a of the flexible circuit board 2) are respectively located at two sides of the short board 253, and the electronic component is electrically connected through the short board 253 and the circuit layer 2a of the flexible circuit board 2. In the present embodiment, the long and short boards 25 omit the flexible circuit board 2 and the power source 5 to be fixed by soldering, and the long board 251 and the short board 253 are first adhered and fixed, and then the electrical subassembly is electrically connected with the circuit layer 2a of the flexible circuit board 2. The flexible circuit board 2 is not limited to one or two layers of circuit boards as described above, and the light source 202 is disposed on the circuit layer 2a and is electrically connected to the power source 5 through the circuit layer 2 a.

In addition, in another embodiment, the long board 25 has a long board 251 and a short board 253, the long board 251 may be the flexible circuit board 2 or the flexible substrate, the flexible circuit board 2 includes a circuit layer 2a and a dielectric layer 2b, the dielectric layer 2b and the short board 253 are fixedly connected in a splicing manner, and then the circuit layer 2a is attached to the dielectric layer 2b and extends to the short board 253, without departing from the application range of the long board 25 of the present invention.

Further, an adhesive film (not shown) is coated on the inner or outer circumferential surface of the lamp tube 1 for isolating the outside and the inside of the lamp tube 1 after the lamp tube 1 is broken. In this embodiment, an adhesive film is coated on the inner peripheral surface of the lamp tube 1.

The adhesive film comprises vinyl-terminated silicone oil, hydrogen-containing silicone oil, dimethylbenzene and calcium carbonate. Wherein the chemical formula of the vinyl-terminated silicone oil is as follows: (C2H 8 OSi) n.C2H2H 3, the chemical formula of the hydrogen-containing silicone oil is: C3H2OSi.cndot.cn4OSi.n.cn3H2Si.

The product is polydimethyl siloxane (organic silicon elastomer), and the chemical formula is:

wherein, the dimethylbenzene is an auxiliary material, and when the adhesive film is coated on the inner peripheral surface of the lamp tube 1 and solidified, the dimethylbenzene volatilizes, and the dimethylbenzene mainly has the function of adjusting the viscosity so as to adjust the thickness of the adhesive film.

In this example, the thickness of the adhesive film was in the range of 100 μm to 140. Mu.m. If the thickness of the adhesive film is less than 100 mu m, the explosion-proof performance is insufficient, when the glass is broken, the whole lamp tube can be cracked, and if the thickness is more than 140 mu m, the light transmittance can be reduced, and the material cost is increased. If the requirements for explosion-proof performance and light transmittance are relaxed, the thickness range of the adhesive film can be widened to 10-800 μm.

In this embodiment, since the inside of the lamp tube is coated with the adhesive film, after the glass lamp tube is broken, the adhesive film will adhere the fragments together, and the through holes penetrating the inside and outside of the lamp tube will not be formed, thereby preventing the user from contacting the charged body inside the lamp tube 1, so as to avoid electric shock accidents, and meanwhile, the adhesive film with the above ratio also has the functions of diffusing light and transmitting light, and improves the light emitting uniformity and the light transmittance of the whole LED straight tube lamp.

Note that, since the lamp panel 2 in the present embodiment is a flexible circuit board, an adhesive film may not be provided.

In order to further improve the light efficiency of the LED straight tube lamp, the embodiment also improves the LED straight tube lamp in two aspects, and aims at the lamp tube and the light source respectively.

Improvements to lamps

Referring to fig. 18, the lamp 1 of the present embodiment further includes a diffusion layer 13 in addition to the lamp board 2 (or flexible circuit board) that is tightly attached to the lamp 1, and the light generated by the light source 202 passes through the diffusion layer 13 and then passes out of the lamp 1.

The diffusion layer 13 plays a role in diffusing the light emitted from the light source 202, so as long as the light can pass through the diffusion layer 13 and then exit the lamp tube 1, the diffusion layer 13 may be arranged in various manners, for example: the diffusion layer 13 may be coated or covered on the inner circumferential surface of the lamp tube 1, or a diffusion coating (not shown) coated or covered on the surface of the light source 202, or a diffusion membrane covered (or covered) outside the light source 202 as a cover.

As shown in fig. 18, the diffusion layer 13 is a diffusion membrane and covers the light source 202, and is not in contact with the light source 202. The general term of the diffusion film is an optical diffusion film or an optical diffusion plate, and one or a combination of several of PS polystyrene, PMMA polymethyl methacrylate, PET (polyethylene terephthalate) and PC (polycarbonate) is usually used to match diffusion particles, so that a composite material is formed, when light passes through the composite material, a diffusion phenomenon can occur, and the light can be corrected to form a uniform surface light source so as to achieve an optical diffusion effect, and finally, the brightness of the light tube is uniformly distributed.

When the diffusion layer 13 is a diffusion coating, its main component may include at least one of calcium carbonate, calcium halophosphate, and aluminum oxide, or a combination thereof. When calcium carbonate is used as a main material and matched with a proper solution, the diffusion coating formed by the calcium carbonate has excellent diffusion and light transmission effects (more than 90% of the opportunity is achieved). In addition, it has been found through creative work that the lamp cap bonded with the reinforcing portion glass sometimes has quality problems, and some proportion is liable to fall off, but as long as the diffusion coating is also applied to the outer surface of the end portion 101 of the lamp tube, the friction force between the lamp cap and the lamp tube is increased between the diffusion coating and the hot melt adhesive 6, so that the friction force between the diffusion coating and the hot melt adhesive 6 is greater than the friction force between the end face of the end portion 101 of the lamp tube and the hot melt adhesive when the diffusion coating is not applied, and therefore, the problem that the lamp cap 3 falls off through the friction force between the diffusion coating and the hot melt adhesive 6 can be solved greatly.

In this example, the diffusion coating comprises, when formulated, calcium carbonate, strontium phosphate (e.g., CMS-5000, white powder), a thickener, and ceramic activated carbon (e.g., ceramic activated carbon SW-C, colorless liquid).

Specifically, when the diffusion coating uses calcium carbonate as a main material, and is matched with a thickener, ceramic activated carbon and deionized water, the mixture is coated on the inner peripheral surface of the glass lamp tube, the average thickness of the coating is between 20 and 30 mu m, and finally the deionized water is volatilized, so that three substances of the calcium carbonate, the thickener and the ceramic activated carbon are left. The diffusion layer 13 formed using such a material may have a light transmittance of about 90%, and generally, the light transmittance ranges from about 85% to 96%. In addition, the diffusion layer 13 can play a role of electric isolation besides the effect of diffusing light, so that when the glass lamp tube breaks, the risk of electric shock of a user is reduced; meanwhile, the diffusion layer 13 can diffuse the light emitted from the light source 202 in all directions, so that the light can illuminate the rear of the light source 202, namely, the side close to the flexible circuit board, thereby avoiding the formation of a dark area in the lamp tube 1 and improving the lighting comfort of the space. In addition, when selecting diffusion coatings of different material compositions, another possible embodiment may be used, in which the diffusion layer thickness ranges from 200 μm to 300 μm, and the light transmittance is controlled between 92% and 94%, with another effect.

In other embodiments, the diffusion coating may also be made of calcium carbonate as the main material, and a small amount of reflective material (such as strontium phosphate or barium sulfate), thickener, ceramic activated carbon and deionized water may be mixed and coated on the inner peripheral surface of the glass lamp tube, the average thickness of the coating falls between 20 and 30 μm, and finally the deionized water will volatilize, leaving only four substances of calcium carbonate, reflective material, thickener and ceramic activated carbon. The diffusion layer aims to diffuse light, the diffusion phenomenon is that light rays are reflected by particles in microcosmic, the particle size of the reflective materials such as strontium phosphate or barium sulfate is far larger than that of calcium carbonate, and therefore, a small amount of reflective materials are added into the diffusion coating, so that the diffusion effect of the light rays can be effectively improved. Of course, in other embodiments, calcium halophosphate or alumina may be selected as the main material of the diffusion coating, the particle size of the calcium carbonate particles falls between about 2 μm and about 4 μm, and the particle sizes of the calcium halophosphate and alumina particles fall between about 4 μm and about 1 μm and about 2 μm, respectively, and when the light transmittance requirement range falls between 85% and 92%, the average thickness of the diffusion coating entirely using calcium carbonate as the main material is about 20 μm to about 30 μm, and when the same light transmittance requirement range (85% to 92%), the average thickness of the diffusion coating entirely using calcium halophosphate as the main material falls between 25 μm and 35 μm, and the average thickness of the diffusion coating entirely using alumina as the main material falls between 10 μm and 15 μm. If the light transmittance is required to be higher, for example, 92% or more, the thickness of the diffusion coating using calcium carbonate, calcium halophosphate or alumina as the main material is required to be thinner, and the average thickness of the coating is between 10 and 15 μm as an example. That is, depending on the application of the lamp 1, the light transmittance is selected to be different, i.e. the main material of the diffusion coating to be applied, the corresponding thickness, etc. are selected. It should be noted that the higher the transmittance of the diffusion layer, the more noticeable the user sees the particulate feel of the light source. In the embodiment, two main methods are used for forming the diffusion coating, namely, firstly, the whole lamp tube is erected, then the pressure is applied in diffusion coating equipment, so that after the whole lamp tube is filled with the diffusion coating solution, the pressure is removed, the thickening agent is contained in the diffusion coating solution, so that the viscosity of the diffusion coating material such as calcium carbonate and the like when the diffusion coating material is attached to the inner peripheral surface of the lamp tube can be increased, and when the diffusion coating solution flows back to the diffusion coating equipment, the air drying mode is used, so that the diffusion coating is uniformly formed on the inner peripheral surface of the lamp tube; 2. the spraying method includes erecting the whole lamp tube, spraying the diffusion coating solution onto the inner surface of the lamp tube with diffusion liquid spraying equipment, and the lamp tube may be inclined or rotated to increase the uniformity of the diffusion coating solution adhered to the inner surface of the lamp tube.

Further, with continued reference to fig. 18, the inner peripheral surface of the lamp tube 1 is further provided with a reflective film 12, and the reflective film 12 is provided around the lamp panel 2 having the light source 202, and occupies a part of the inner peripheral surface of the lamp tube 1 in the circumferential direction. As shown in fig. 18, the reflective film 12 extends along the tube circumference on both sides of the lamp panel 2, and the lamp panel 2 is located substantially at the middle position of the reflective film 12 in the circumference direction. The arrangement of the reflective film 12 has effects in two aspects, on the one hand, when the lamp 1 is seen from the side (X direction in the drawing), the light source 202 is not directly seen due to the blocking of the reflective film 12, thereby reducing visual discomfort caused by the sense of particles; on the other hand, the light emitted by the light source 202 passes through the reflection effect of the reflection film 12, so that the divergence angle of the lamp tube can be controlled, and the light rays are more irradiated towards the direction without the reflection film, so that the LED straight tube lamp obtains the same irradiation effect with lower power, and the energy saving performance is improved.

Specifically, the reflective film 12 is attached to the inner peripheral surface of the lamp tube 1, and an opening 12a corresponding to the lamp panel 2 is formed in the reflective film 12, and the size of the opening 12a should be identical to the lamp panel 2 or slightly larger than the lamp panel 2 for accommodating the lamp panel 2 having the light source 202. When in assembly, the lamp panel 2 (or the flexible circuit board) with the light source 202 is arranged on the inner peripheral surface of the lamp tube 1, and then the reflecting film 12 is attached to the inner peripheral surface of the lamp tube, wherein the openings 12a of the reflecting film 12 are in one-to-one correspondence with the lamp panel 2, so that the lamp panel 2 is exposed out of the reflecting film 12.

In this embodiment, the reflectance of the reflective film 12 is at least more than 85%, and the reflection effect is good, and in general, at least 90%, preferably at least 95%, so as to obtain a more desirable reflection effect. The length of the reflective film 12 extending in the circumferential direction of the lamp tube 1 occupies 30% to 50% of the entire circumference of the lamp tube 1, that is, the ratio between the circumferential length of the reflective film 12 and the circumference of the inner circumferential surface of the lamp tube 1 in the circumferential direction of the lamp tube 1 ranges from 0.3 to 0.5. In the present invention, the lamp panel 2 is disposed at the middle position of the reflective film 12 in the circumferential direction, that is, the reflective films 12 on both sides of the lamp panel 2 have substantially the same area, as shown in fig. 18. The material of the reflective film may be PET, and if a reflective material component such as strontium phosphate or barium sulfate is added, the reflective effect is better, the thickness is 140 μm to 350 μm, and generally 150 μm to 220 μm, and the effect is better.

In other embodiments, the reflective film 12 may be disposed in other forms, for example, along the circumferential direction of the lamp 1, the reflective film 12 may be disposed on one side or both sides of the lamp panel 2, that is, the reflective film 12 contacts one or both sides of the lamp panel 2 in the circumferential direction, and the Zhou Xiangshan side thereof occupies the same proportion of the circumference of the lamp 1 as in the present embodiment, and the structure in which the reflective film 12 contacts one side of the lamp panel 2 is shown in fig. 19. Alternatively, as shown in fig. 20 and 21, the reflective film 12 may be assembled without forming an opening, the reflective film 12 is directly attached to the inner peripheral surface of the lamp tube 1, and then the lamp panel 2 with the light source 202 is fixed to the reflective film 12, where the reflective film 12 may extend along the circumferential direction of the lamp tube on both sides of the lamp panel 2, as shown in fig. 20, or extend along the circumferential direction of the lamp tube on only one side of the lamp panel 2, as shown in fig. 21.

In other embodiments, only the reflective film 12 may be provided, and the diffusion layer 13 may not be provided, as in fig. 20, 21, and 22.

In other embodiments, the width of the flexible circuit board may be widened, and since the surface of the circuit board includes a circuit protection layer of the ink material, the ink material has a function of reflecting light, the circuit board itself may function as the reflective film 12 at the widened portion. Preferably, the ratio between the length of the flexible circuit board extending along the circumferential direction of the lamp tube 2 and the circumference of the inner circumferential surface of the lamp tube 2 is in the range of 0.3-0.5. As described in the previous embodiments, the flexible circuit board may be coated with a circuit protection layer, which may be an ink material with reflection increasing function, and the widened flexible circuit board extends circumferentially from the light source, so that the light of the light source is more concentrated by the widened portion.

In the embodiments of fig. 12-14 described above, the inner peripheral surface of the glass tube may be entirely coated with a diffusion coating or may be partially coated with a diffusion coating (where the reflective film 12 is present, but in either case, the diffusion coating is preferably applied to the outer surface of the end portion of the lamp vessel 1 so as to make the adhesion between the lamp cap 3 and the lamp vessel 1 stronger.

(II) improvements to light sources

Referring to fig. 23, the light source 202 may be further modified to include a holder 202b having a recess 202a, and an LED die (or chip) 18 disposed in the recess 202 a. The grooves 202a are filled with phosphor that covers the LED die (or chip) 18 to perform the function of color conversion. Specifically, the conventional LED die (or chip) 18 has a square shape with a ratio of length to width of approximately 1:1. The ratio of the length to the width of the LED die (or chip) 18 used in the present invention may be 2:1-10:1, and the range of the above embodiment is preferably 2.5:1-5:1, and the optimal range is 3:1-4.5:1, so that the length direction of the LED die (or chip) 18 is arranged along the length direction of the lamp tube 1, and the problems of the average current density of the LED die (or chip) 18, the overall light-emitting shape of the lamp tube 1, and the like are improved.

In one lamp 1, the light sources 202 have a plurality, and the plurality of light sources 202 are arranged in one or more rows, each row of light sources 202 being arranged along the axial direction (Y direction) of the lamp 1. The recess 202a in each bracket 202b may be one or more.

The support 202b of the at least one light source 202 has a first sidewall 15 arranged along the length direction of the lamp, and a second sidewall 16 arranged along the width direction of the lamp, wherein the first sidewall 15 is lower than the second sidewall 16. Alternatively, the bracket 202b of at least one light source 202 has a second sidewall 16 extending in the length direction of the lamp, and a first sidewall 15 extending in the width direction of the lamp, the first sidewall 15 being lower than the second sidewall 16. The first sidewall and the second sidewall herein refer to sidewalls for enclosing the groove 202 a.

In this embodiment, each bracket 202b has one groove 202a, and correspondingly, each bracket 202b has two first sidewalls 15 and two second sidewalls 16.

Wherein, the two first side walls 15 are arranged along the length direction (Y direction) of the lamp tube 1, and the two second side walls 16 are arranged along the width direction (X direction) of the lamp tube 1. The first side wall 15 extends in the width direction (X direction) of the lamp tube 1, the second side wall 16 extends in the length direction (Y direction) of the lamp tube 1, and the groove 202a is defined by the first side wall 15 and the second side wall 16. In other embodiments, the side walls of the rack in which one or more light sources are allowed to be arranged or extended in other ways in a column of light sources.

When the user views the tube from the side of the tube, for example in the X-direction, the second sidewall 16 may block the user's line of sight from directly seeing the light source 202 to reduce particle discomfort. The first sidewall 15 "extends along the width direction of the lamp tube 1" only needs to satisfy that the extending trend is substantially the same as the width direction of the lamp tube 1, and is not required to be strictly parallel to the width direction of the lamp tube 1, for example, the first sidewall 15 may have a slight angle difference with the width direction of the lamp tube 1, or the first sidewall 15 may also have various shapes such as a folded line shape, an arc shape, and a wave shape; the second side wall 16 "extends along the length direction of the lamp tube 1" so long as the extending direction is substantially the same as the length direction of the lamp tube 1, and is not required to be strictly parallel to the length direction of the lamp tube 1, for example, the second side wall 16 may have a slight angle difference from the length direction of the lamp tube 1, or the second side wall 16 may have various shapes such as a fold line shape, an arc shape, and a wave shape.

In this embodiment, the first side wall 15 is lower than the second side wall 16, so that the light can easily spread out over the support 202b, and the uncomfortable feeling of particles can be avoided in the Y direction through the design of the interval with moderate density, and in other embodiments, if the first side wall is not lower than the second side wall, the light sources 202 in each row are more closely arranged, so that the particle feeling can be reduced, and the efficiency is improved.

Wherein the inner surface 15a of the first side wall 15 is a slope, the slope being arranged to facilitate the light to be emitted through the slope relative to the arrangement of the inner surface 15a perpendicular to the bottom wall. The ramp may comprise a flat or arcuate surface, in this embodiment a flat surface is used, and the slope of the flat surface is between about 30 degrees and about 60 degrees. That is, the angle between the plane and the bottom wall of the recess 202a ranges from 120 degrees to 150 degrees.

In other embodiments, the slope of the plane may also be between about 15 degrees and about 75 degrees, that is, the angle between the plane and the bottom wall of the recess 202a may be between about 105 degrees and about 165 degrees. Alternatively, the ramp may be a combination of a planar surface and a cambered surface.

In other embodiments, if the light sources 202 are arranged in multiple rows along the axial direction (Y direction) of the light tube 1, only the rack 202b of the two outermost rows of light sources 202 (i.e. two rows of light sources 202 adjacent to the tube wall of the light tube) has two first side walls 15 arranged along the length direction (Y direction) of the light tube 1 and two second side walls 16 arranged along the width direction (X direction) of the light tube 1, that is, the rack 202b of the two outermost rows of light sources 202 has the first side walls 15 extending along the width direction (X direction) of the light tube 1, and the second side walls 16 extending along the length direction (Y direction) of the light tube 1, and the rack 202b of the other rows of light sources 202 between the two rows of light sources 202 is not limited, for example, each rack 202b may have two first side walls 15 arranged along the length direction (Y direction) of the light tube 1 and two second side walls 16 arranged along the width direction (X direction) of the light tube 1, or each rack 202b may have the two second side walls 16 arranged along the width direction (X direction) of the light tube 1, for example, and the second side walls 202b may be arranged along the width direction (Y direction) of the light tube 1 and the second side walls 202b may be staggered, so as long as the user can see the two side walls 202b of the light sources are not in the direction of the light tube 1. As in the present embodiment, other arrangements or extensions of the side walls of the rack in which one or more light sources are located are allowed for the two outermost columns of light sources.

It can be seen that when the light sources 202 are arranged in a row along the length direction of the lamp, all the second side walls 16 on the same side in the width direction of the lamp are on the same line in the bracket 202b of the light sources 202, i.e. the second side walls 16 on the same side form a wall-like structure to block the user's vision from directly seeing the light sources 202.

When the plurality of light sources 202 are arranged in a plurality of rows along the length direction of the lamp, the plurality of rows of light sources 202 are distributed along the width direction of the lamp, and for two rows of light sources located at the outermost side in the width direction of the lamp, all the second side walls 16 located at the same side in the width direction of the lamp are on the same straight line in the brackets 202b of the plurality of light sources 202 of each row. This is because: when the user views the lamp from the side in the width direction, the aim of reducing the uncomfortable feeling of particles can be achieved as long as the second side wall 16 of the bracket 202b in the two outermost rows of the light sources 202 can block the user's sight from directly seeing the light sources 202. The arrangement and extension of the side walls of the middle row or rows of light sources 202 are not required, and the arrangement and extension of the side walls of the middle row or rows of light sources 202 can be the same as those of the two outermost rows of light sources 202, or other arrangements can be adopted.

It should be noted that, in other embodiments, for the same LED straight tube lamp, in the characteristics of "the lamp tube has the reinforcing portion structure", "the lamp panel adopts the flexible circuit board", "the inner peripheral surface of the lamp tube is coated with the adhesive film", "the inner peripheral surface of the lamp tube is coated with the diffusion layer", "the light source housing is coated with the diffusion film", "the inner wall of the lamp tube is coated with the reflective layer", "the lamp cap is a lamp cap including the heat conducting portion", "the lamp cap including the magnetic conductive metal sheet", "the light source has the bracket", etc., one or more of the technical characteristics may be included, wherein the content of "the lamp tube has the reinforcing portion structure" may be selected from one of the technical characteristics related to the embodiments or a combination thereof, the content of "the lamp panel adopts the flexible circuit board" may be selected from one of the technical characteristics related to the embodiments or a combination thereof, wherein the content of the "inner peripheral surface of the lamp tube is coated with the adhesive film" may be selected from one of the relevant technical features of the embodiment or a combination thereof, wherein the content of the "inner peripheral surface of the lamp tube is coated with the diffusion layer" may be selected from one of the relevant technical features of the embodiment or a combination thereof, wherein the content of the "light source housing is coated with the diffusion film" may be selected from one of the relevant technical features of the embodiment or a combination thereof, wherein the content of the "inner peripheral surface of the lamp tube is coated with the reflective layer" may be selected from one of the relevant technical features of the embodiment or a combination thereof, wherein the content of the "lamp cap is a lamp cap comprising a heat conducting part" may be selected from one of the relevant technical features of the embodiment or a combination thereof, wherein the content of the lamp cap which comprises magnetic conductive metal sheets can be selected from one or a combination of the related technical characteristics of the embodiment, and the content of the light source with a bracket can be selected from one or a combination of the related technical characteristics of the embodiment.

In the structure of the reinforcement part, the lamp tube comprises a main body part and end parts respectively positioned at two ends of the main body part, wherein the end parts are respectively sleeved on a lamp cap, the outer diameter of at least one end part is smaller than that of the main body part, the lamp cap corresponding to the end part with the outer diameter smaller than that of the main body part has the outer diameter equal to that of the main body part.

In the lamp panel adopts the flexible circuit board, the flexible circuit board is connected with the output end of the power supply through wire bonding or welded with the output end of the power supply. In addition, the flexible circuit board comprises a stack of a dielectric layer and a circuit layer; the flexible circuit board may be coated with a circuit protection layer of an ink material on the surface and realize the function of a reflective film by increasing the width in the circumferential direction.

The inner peripheral surface of the lamp tube is coated with a diffusion layer, and the diffusion layer comprises at least one of calcium carbonate, calcium halophosphate and aluminum oxide, a thickening agent and ceramic activated carbon. In addition, the diffusion layer can also be a diffusion membrane and is covered outside the light source.

The light source can be arranged on the reflecting layer, in the opening of the reflecting layer or at the side of the reflecting layer.

In the lamp cap design, the lamp cap may include an insulating tube and a heat conducting portion, wherein the hot melt adhesive may fill a portion of the accommodating space or fill the accommodating space. Or, the lamp cap comprises an insulating tube and a magnetic conductive metal piece, wherein the magnetic conductive metal piece can be round or non-round, and the contact area with the insulating tube can be reduced by arranging a hollow hole structure or an indentation structure. In addition, the support part and the convex part can be arranged in the insulating tube to strengthen the support of the magnetic conduction metal piece and reduce the contact area between the magnetic conduction metal piece and the insulating tube.

In a light source design, the light source comprises a bracket with a groove and an LED crystal grain arranged in the groove; the bracket is provided with a first side wall and a second side wall, the first side wall is arranged along the length direction of the lamp tube, the second side wall is arranged along the width direction of the lamp tube, and the first side wall is lower than the second side wall.

That is, the above features can be combined in any arrangement and used for improvement of the LED straight tube lamp.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention, and the scope of the invention should be assessed accordingly to that of the appended claims.

Claims

1. The utility model provides a welding method of LED straight tube lamp, LED straight tube lamp includes fluorescent tube and locates the lamp holder of fluorescent tube one end, locate power in the lamp holder, locate the lamp plate in the fluorescent tube, the lamp plate is flexible circuit board, its characterized in that includes:

2. The welding method of the LED straight tube lamp according to claim 1, wherein: the welding perforation or welding notch on the light source bonding pad is formed in advance or is formed in a penetrating mode through a welding pressure head in the welding process.

3. The welding method of the LED straight tube lamp according to claim 1, wherein: the flexible circuit board is provided with a positioning hole, and the light source bonding pad and the power source bonding pad are positioned through the positioning hole in the welding step.

4. The welding method of the LED straight tube lamp according to claim 1, wherein: the lamp panel is fixed on the inner peripheral surface of the lamp tube through an adhesive sheet.

5. The welding method of the LED straight tube lamp according to claim 1, wherein: the light source bonding pad and the power source bonding pad are arranged on the same side surface for bonding, and one end of the flexible circuit board and one end of the power source for bonding have a lateral tensile force on the power source.

6. The welding method of the LED straight tube lamp according to claim 1, wherein: the light source bonding pad and the power source bonding pad are arranged on the same side surface for bonding, and one end of the flexible circuit board and the power source for bonding is provided with a downward pulling force on the power source.

7. The welding method of the LED straight tube lamp according to claim 1, wherein: the flexible circuit board is provided with a free part, and the free part contracts towards the inside of the lamp tube in the assembly process.

8. The welding method of the LED straight tube lamp according to claim 1, wherein: the light source bonding pad of the flexible circuit board is overlapped on the power source bonding pad of the power source, and the welding pressure head is pressed on the flexible circuit board.

9. An LED straight tube lamp comprising:

the power supply is arranged in the lamp cap;

the welding method is characterized in that the light source and the power supply are electrically connected through the lamp panel by adopting the welding method according to any one of claims 1 to 8.