CN212456345U

CN212456345U - LED straight lamp

Info

Publication number: CN212456345U
Application number: CN202020857805.9U
Authority: CN
Inventors: 江涛; 王名斌; 陈俊仁; 熊爱明; 邹枫; 徐卫洪; 陆健; 王广东
Original assignee: Jiaxing Super Lighting Electric Appliance Co Ltd
Current assignee: Jiaxing Super Lighting Electric Appliance Co Ltd
Priority date: 2019-01-02
Filing date: 2019-12-16
Publication date: 2021-02-02
Anticipated expiration: 2029-12-16
Also published as: CN212456348U; CN212456347U; CN212456346U

Abstract

The utility model provides a LED straight tube lamp, include: a lamp tube; a power source; the first circuit board is arranged in the lamp tube, and a plurality of light sources are arranged on the first circuit board; two lamp caps respectively arranged at two ends of the lamp tube; the hollow conductive needle is fixed on the lamp holder; the power supply comprises a second circuit board, wherein the second circuit board is provided with a first surface and a second surface which are opposite to each other and are parallel to each other; and one end of the connecting wire is electrically connected with the hollow conductive needle, the other end of the connecting wire is connected with the second circuit board, and the connecting wire comprises a fusing part.

Description

LED straight lamp

The utility model discloses the application is that 16 months 12 of 2019 submit the branch case application of the chinese patent office, application number 201922251403.4, new and novel name "a LED straight tube lamp".

Technical Field

The utility model belongs to the technical field of LED lighting device, specifically speaking relates to a LED straight tube lamp.

Background

LED lighting is widely used because of its advantages of energy saving, long life, etc. The LED fluorescent lamp, commonly known as a straight tube lamp, generally includes a lamp tube, a first circuit board disposed in the lamp tube and having a light source, and lamp caps disposed at two ends of the lamp tube, wherein a power source is disposed in the lamp caps, and the light source is electrically connected to the power source through the first circuit board. The light source is a plurality of LED straight lamps arranged on the first circuit board, and the LED straight lamps are sequentially arranged along the length direction of the lamp tube.

When the LED straight tube lamp works, an arc discharge phenomenon may occur, namely, the voltage exceeds the tolerance of air to enable the air to be ionized into a conductor, namely, an arc is generated, the arc generally bypasses an insulator and is generated along the surface of the insulator, and therefore damage can be caused to the insulator, for example, the high temperature of the arc can melt or crack the insulator. Aiming at the arc discharge protection scheme of the LED straight tube lamp, the prior art generally adopts a heating fuse or a heating degree feedback ionization mode. For example, the LED straight lamp includes a lamp cap, a hollow conductive pin, a wire, and a thermal fuse, wherein the hollow conductive pin is fixed on the lamp cap, one end of the wire is electrically connected to the hollow conductive pin, and the other end of the wire is connected to a power supply, the thermal fuse is disposed on the wire, and when an arc generates a high temperature, the thermal fuse is disconnected to perform an over-temperature protection function, thereby preventing further damage. The temperature fuse has the characteristic of high cost, so the temperature fuse is adopted as an arc discharge protection scheme, and the cost control of the LED straight tube lamp is not facilitated.

In summary, in view of the deficiencies and defects of the LED straight lamp in the prior art, how to design the LED straight lamp is a technical problem to be solved by those skilled in the art is urgent.

SUMMERY OF THE UTILITY MODEL

This abstract describes many embodiments of the invention. The term "invention" is used merely to describe some embodiments disclosed in this specification (whether or not in the claims), and not a complete description of all possible embodiments. Certain embodiments described above as various features or aspects of the invention may be combined in different ways to form a LED straight tube lamp or a portion thereof.

An embodiment of the utility model provides a new LED straight tube lamp to and the characteristic of each aspect, in order to solve above-mentioned problem.

An embodiment of the utility model provides a LED straight tube lamp, include:

a lamp tube;

a power source;

the first circuit board is arranged in the lamp tube, and a plurality of light sources are arranged on the first circuit board;

two lamp caps respectively arranged at two ends of the lamp tube; and

the hollow conductive needle is fixed on the lamp holder;

the power supply comprises a second circuit board, wherein the second circuit board is provided with a first surface and a second surface which are opposite to each other and are parallel to each other;

and one end of the connecting wire is electrically connected with the hollow conductive needle, the other end of the connecting wire is connected with the second circuit board, and the connecting wire comprises a fusing part.

The embodiment of the utility model provides a melting point of fusing part is less than or equal to the melting point of arbitrary conducting material on the second circuit board.

The embodiment of the utility model provides a connecting wire wholly by fusing part constitutes.

The embodiment of the utility model provides a connecting wire only includes partial fusing part, fusing part's melting point is less than the melting point of the rest of connecting wire.

The embodiment of the utility model provides a connecting wire expose in the length of the outside part of hollow conductive needle is shorter than two distance between the hollow conductive needle.

The embodiment of the utility model provides a connecting wire expose in the length of the outside part of hollow conductive needle is less than two half of distance between the hollow conductive needle.

The embodiment of the utility model provides a be provided with the absorption portion on the second circuit board, connecting wire's fusing part's one end with the absorption portion electricity is connected.

The embodiment of the utility model provides an adsorption part adopts the metal material.

The embodiment of the utility model provides a melting point of absorption portion is higher than the melting point of fusing part.

The embodiment of the utility model provides a still provide a LED straight tube lamp, including fluorescent tube, lamp holder, circuit board and hollow conductive needle, the lamp holder with the fluorescent tube is connected, hollow conductive needle set up in on the lamp holder, its characterized in that: the circuit board at least comprises two connecting parts, and the connecting parts are communicated through a connecting unit; the connection unit includes a fusing part.

The embodiment of the utility model provides a connecting element only by fusing portion constitutes.

The embodiment of the utility model provides a connecting element only includes partial fusing portion.

The embodiment of the utility model provides a two set up the absorption unit between the connecting portion, the at least partial contact of fusing portion absorption unit.

The embodiment of the utility model provides an absorption unit is the metal material.

The embodiment of the utility model provides a melting point of fusing part is less than or equal to arbitrary conducting material's on the circuit board melting point.

The embodiment of the utility model provides a connecting portion the absorption unit with the melting point of the material of circuit board all is higher than fusing portion.

Compared with the prior art, the utility model outstanding and profitable technological effect is: the fusing part is made of a conductive material with a low melting point, so that the purpose that the connecting lead is fused at the fusing part at a certain temperature (when the fusing part reaches the melting point of the fusing part) is achieved, the connecting lead is disconnected, and the over-temperature protection effect is achieved; the melting point of the fusing part is less than or equal to the melting point of any conductive substance on the second circuit board, so that when the temperature is too high, the fusing part is firstly disconnected, and the situation that the conductive substance on the second circuit board is fused to cause short circuit or even ignition on the second circuit board is avoided; the adsorption part is electrically conductive material, and the one end that the adsorption part was connected to the fusing part melts the back, and the material of the fusing part after the adsorption part adsorbable and the gathering melts to prevent that the material flow direction after the fusing part melts other places and cause the condition such as short circuit.

Drawings

Fig. 1 is an exploded perspective view showing a LED straight lamp according to an embodiment of the present invention;

FIG. 2 is a front view of a lamp head according to an embodiment of the present invention;

FIG. 3 is a schematic view showing the connection of the lamp cap of FIG. 2 to a second circuit board;

FIG. 4 is a perspective view showing the structure of the lamp cap of FIG. 2;

FIG. 5 is a front view of a lamp head according to an embodiment of the present invention;

FIG. 6 is a schematic view showing the connection of the lamp cap of FIG. 5 to a second circuit board;

FIG. 7 is a perspective view showing the structure of the lamp cap of FIG. 3;

fig. 8 is a front view showing the connection of the lamp cap and the second circuit board according to an embodiment of the present invention;

FIG. 9 is a perspective view showing the structure of the lamp cap of FIG. 8;

FIG. 10 is a front view of a lamp head according to an embodiment of the invention;

FIG. 11 is a schematic view showing the connection of the lamp head of FIG. 10 to a second circuit board;

fig. 12 is a perspective view showing the structure of the lamp cap of fig. 10;

FIG. 13 is a front view showing the structure of the lamp head of the other embodiment;

FIG. 14 is a front view showing the structure of a lamp head of an embodiment;

FIG. 15 is a partial cross-sectional view showing the structure of a lamp cap of an embodiment;

FIG. 16 is a perspective view showing the construction of the lamp head;

FIG. 17 is a perspective view showing the structure of the second circuit board;

FIG. 18 is a sectional view showing a sectional structure of the lamp head;

fig. 19 is a perspective view showing the structure of the cap body.

FIG. 20 is a partial view showing a connection structure of a power supply and a first circuit board in one embodiment;

fig. 21 is an enlarged view showing the structure at B in fig. 20;

FIG. 22 is a partial schematic view showing the connection of the second circuit board to the first circuit board in other embodiments;

FIG. 23 is a sectional view showing a partial schematic view of an LED straight tube lamp in one embodiment;

FIG. 24 is a front view of a first circuit board of one embodiment;

FIG. 25 is a front view of a second circuit board of an embodiment;

fig. 26 is a cross-sectional view showing the connection of the connecting leads to the second circuit board;

FIG. 27 is a cross sectional view showing a state in which the fusing part is bent;

FIG. 28 is a sectional view showing a state where the fusing part is bent;

FIG. 29 is a cross-sectional view showing a partial schematic view of an LED straight lamp in one embodiment.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. The following directions such as "axial direction", "above", "below", etc. are all for showing the structural position relationship more clearly, and are not limiting to the present invention. In the present invention, the terms "vertical", "horizontal" and "parallel" are defined as: including ± 10% of cases based on the standard definition. For example, vertical generally refers to an angle of 90 degrees relative to a reference line, but in the present invention, vertical refers to a situation within 80 to 100 degrees inclusive.

As shown in fig. 1, an embodiment of the present invention provides an LED straight lamp, which includes: the lamp comprises a lamp tube 1, a first circuit board 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 caps 3 are provided with hollow conductive pins 4 used for connecting an external power supply. The lamp tube 1 can be a plastic lamp tube, a glass lamp tube, or a plastic and metal mixed lamp tube, or a glass and metal mixed lamp tube, and the two lamp caps 3 have the same or different sizes (the axial length of the lamp caps 3). In this embodiment, the first circuit board 2 is provided with a plurality of light sources 21, when the light sources 21 work, the light sources 21 form a heat conduction path with the lamp tube 1 through the first circuit board 2, and the heat conducted to the lamp tube 1 can be dissipated to the outside air, so that the heat generated when the light sources 21 work can be rapidly dissipated from the inside of the lamp tube 1 to the outside of the lamp tube 1. In this embodiment, the first circuit board 2 is fixed to the inner periphery of the lamp tube 1 by glue, that is, the first circuit board 2 is fixed to the inner periphery of the lamp tube 1 by glue. The first circuit board 2 forms a heat conducting path with the lamp tube 1 through glue. In other embodiments, the first circuit board 2 is fixed to the inner periphery of the lamp tube 1 by using a heat-conducting adhesive to improve the heat-conducting efficiency. The lamp holder 3 is internally provided with a power supply 5, the power supply 5 is electrically connected with the light source 21 through the first circuit board 2, and at least one part of the power supply 5 is overlapped with the lamp holder 3 in the radial projection of the LED straight lamp. The power supply 5 may be an integral single unit (e.g., the power modules are all concentrated in one component and are located in one of the lamp caps 3 (non-light emitting area)). Alternatively, the power supply 5 may be divided into two parts, which are called dual bodies (i.e. all power supply modules are respectively disposed in two parts), and the two parts are respectively disposed in the lamp caps 3 (non-light-emitting regions) at the two ends of the lamp tube 1. In this embodiment, the power supply 5 includes a second circuit board 51 (shown in fig. 3) and a plurality of electronic components 52.

As shown in fig. 2 to 4, a lamp cap 3 according to an embodiment of the present invention can be applied to a LED straight lamp. The burner 3 comprises a side wall 31 and an end wall 32, the side wall 31 being tubular. The sidewall 31 is disposed coaxially with the lamp tube 1 and connected to each other, which means that the lamp cap 3 and the lamp tube 1 may have tolerance in manufacturing, and thus the axes of the two may be slightly offset, but the lamp cap 3 and the lamp tube 1 are generally coaxial. The plane of the end wall 32 is perpendicular or substantially perpendicular to the axial direction of the side wall 31, and the end wall 32 connects the end of the side wall 31 away from the lamp tube 1, which is perpendicular in the sense that the end wall 32 and the side wall 31 are not perpendicular by 90 degrees but slightly inclined due to the tolerance in manufacturing, which still falls within the range of perpendicular. However, even if the end wall 32 is slightly inclined with respect to the axial direction of the side wall 31, it may form a space for disposing the power source 5 together with the side wall 31 and may match the lamp socket. The side walls 31 and the end walls 32 form an inner space of the lamp cap 3, and the power supply 5 is at least partly arranged in the inner space of the lamp cap 3.

As shown in fig. 2, the base 3 includes a first rib 33, the first rib 33 is provided on an inner peripheral surface of the sidewall 31 of the base 3, and the first rib 33 extends in the axial direction of the base 3. The first rib 33 may be continuous and integral in the axial direction of the base 3, or may be multi-segmented. The first rib 33 and the inner circumferential surface of the side wall 31 form a notch 35, and the second circuit board 51 is inserted into the notch 35 and fixed. Referring to fig. 3, specifically, the second circuit board 51 has a first surface 511 and a second surface 512 which are opposite and parallel to each other, and the first surface 511 and the second surface 512 are substantially parallel to the axial direction of the base 3. When the second circuit board 51 is inserted into the card slot 35 to be fixed, the first face 511 of the second circuit board 51 corresponds to the surface on the side of the first rib 33, and the second face 512 of the second circuit board 51 corresponds to the inner peripheral surface of the side wall 31. Preferably, the first surface 511 of the second circuit board 51 abuts against the first rib 33, and the edge of the second surface 512 of the second circuit board 51 abuts against the inner circumferential surface of the side wall 31, so that the second circuit board 51 is fixed. In practical use, the first ribs 33 are used in pairs, that is, slots 35 are formed on both sides of the base 3 to fix both sides of the second circuit board 51. As shown in fig. 2, the card slots 35 are arranged in 4 groups, that is, two pairs of card slots 35, and the two pairs of card slots 35 are arranged symmetrically with respect to each other. Therefore, when the lamp cap 3 is connected to the second circuit board 51, the second circuit board 51 can be selectively inserted into the two pairs of card slots 4 according to the actual position.

In this embodiment, the first rib 33 may be made of an elastic material (such as plastic), so that, in the process of inserting the second circuit board 51 into the slot 35 of the lamp head 3, the first rib 33 may provide a certain deformation space to adapt to the thickness error generated during the manufacturing of the second circuit board 51 or the second circuit board 51 with different thickness sizes.

As shown in fig. 2 to 4, the lamp cap 3 is provided with a hole 3001. By means of the holes 3001, on one hand, heat generated by the power module inside the lamp holder 3 can be dissipated without causing the high temperature state inside the lamp holder 3, and on the other hand, the problem that water vapor is indirectly formed on the inner wall of the lamp tube due to overhigh humidity inside the lamp tube in the use process of the LED can be avoided, so that the reliability of the internal elements of the lamp holder 3 is reduced. In another embodiment of the present invention, the holes 3001 are symmetrically disposed with respect to the hollow conductive pin holes of the lamp cap 3, so that no matter the second circuit board 51 is disposed in any one of the set of slots 4, the corresponding holes 3001 can dissipate heat.

As shown in fig. 5, 6 and 7, a lamp cap 3 according to an embodiment of the present invention can be applied to an LED straight lamp. The difference between the base 3 proposed in this embodiment and the base 3 (the base 3 shown in fig. 2 to 4) of the previous embodiment is that the abutting portion 331 is provided on the first rib 33 of the base 3, and the abutting portion 331 is protruded on the surface of the first rib 33 opposite to the first surface 511 of the second circuit board 51. The abutting portion 331 extends in the axial direction of the base 3, and the abutting portion 331 may be continuous, integral, or multi-segmented in the axial direction of the base 3. The abutting portion 331 has an abutting surface 3311, and corresponds to the first surface 511 of the second circuit board 51 through the abutting surface 3311. For example, the first surface 511 of the second circuit board 51 abuts against the abutting surface 3311. When the second circuit board 51 is fixed, the first surface of the second circuit board 51 corresponds to the abutting surface 3311, and the second surface thereof corresponds to the inner peripheral surface of the sidewall 31, that is, the abutting surface 3311 and the inner peripheral surface of the sidewall 31 form the slot 35. Preferably, the first surface 511 of the second circuit board 51 abuts against the abutting surface 3311, and the edge of the second surface 512 of the second circuit board 51 abuts against the inner peripheral surface of the sidewall 31, so that the second circuit board 51 is fixed. Compared with the surface of the second circuit board 51 on the side of the first rib 33 where the first surface 511 directly corresponds to (the surface of the first surface 511 directly contacts the first rib 33), the contact area between the first surface 511 of the second circuit board 51 and the first rib 33 can be reduced by the arrangement of the abutting portion 331, and the resistance at the time of insertion can be reduced because the contact area is reduced in the process of inserting the second circuit board 51 into the base 3.

As shown in fig. 7, the abutting portion 331 is provided with a first guide portion 3312 at an end of the base 3 axially distant from the end wall 32, and the first guide portion 3312 gradually decreases in height relative to the surface of the first rib 33 as it goes away from the end wall 32. Thereby, the insertion of the second circuit board 51 is facilitated.

As shown in fig. 5, the abutment 331 is perpendicular or substantially perpendicular to the first rib 33. The abutment portion 331 has a cross-sectional width dimension that gradually decreases as it goes away from the surface of the first rib 33. That is, the abutment portion 331 has the largest width at the position where it connects with the first rib 33. Thus, the strength of the connection between the abutting portion 331 and the first rib 33 can be increased, and the abutting portion 331 is prevented from being broken at the connection between the abutting portion 331 and the first rib 33 during use. In other embodiments, in order to prevent the connection between the abutting portion 331 and the first rib 33 from breaking, stress relief may be performed. For example, the joint of the abutting portion 331 and the first rib 33 is configured as a circular arc transitional joint (not shown).

As shown in fig. 13, in another embodiment of the present invention, in order to reduce the contact area between the first rib 33 and the second circuit board 51, the first rib 33 is parallel to the axial direction of the lamp cap 3, the second circuit board 51 is parallel to the axial direction of the lamp cap 3, and an included angle is formed between the first rib 33 and the second circuit board 51. So that the end of the first rib 33 contacts the first surface 511 of the second circuit board 51, thereby reducing the contact area between the first rib 33 and the second circuit board 51 and reducing the resistance when the second circuit board 51 is inserted into the card slot 35. In this embodiment, an included angle c between the first rib 33 and the second circuit board 51 is an acute angle. And the contact of the first rib 33 with the second circuit board 51 is a line contact.

As shown in fig. 8 and 9, a lamp cap 3 according to an embodiment of the present invention can be applied to a LED straight lamp. The difference between the base 3 of the present embodiment and the base 3 of the previous embodiment (the base 3 shown in fig. 5 to 7) is that the base 3 further includes a positioning portion 36, and the positioning portion 36 is provided on the inner circumferential surface of the sidewall 31 and extends in the axial direction of the base 3. The positioning portion 36 corresponds to a side surface of the second circuit board 51 to limit the side surface of the second circuit board 51, and prevent the second circuit board 51 from deflecting relative to the axial direction of the lamp head 3, so that when the second circuit board 51 is inserted into the card slot 35, the second circuit board 51 deflects to cause a situation that the second circuit board cannot be inserted.

As shown in fig. 8, the positioning portion 36 maintains a gap with the side surface of the second circuit board 51 to prevent the positioning portion 36 from generating a certain resistance to the insertion of the second circuit board 51 into the card slot 35. The positioning portion 36 is continuous and integral in the axial direction of the base 3.

As shown in fig. 8, the position of the positioning portion 36 does not exceed the position of the abutment surface 3311 in the width of the base 3. So as to prevent the positioning part 36 from influencing the depth of the clamping groove 35 in the width direction of the lamp holder 3.

As shown in fig. 9, one end of the positioning portion 36, which is away from the end wall 32 in the axial direction of the base 3, is provided with a second guide portion 361. The second guide 361 gradually decreases in height from the inner circumferential surface of the side wall 31 in a process of being away from the end wall 32. Thereby, the insertion of the second circuit board 51 is facilitated.

As shown in fig. 10, 11 and 12, a lamp cap 3 according to an embodiment of the present invention can be applied to a LED straight lamp. The difference between the base 3 of the present embodiment and the base 3 of the previous embodiment (the base 3 shown in fig. 8 to 9) is that the base 3 further includes a second rib 34, a locking groove 35 is formed between the first rib 33 (the abutting portion 331 of the first rib 33) and the second rib 34, and the second rib 34 is protruded on the inner peripheral surface of the sidewall 31. That is, the first surface 511 of the second circuit board 51 corresponds to the first rib 33 (the abutting portion 331 of the first rib 33), and the second surface 512 of the second circuit board 51 corresponds to the second rib 34. In addition, the side surface of the second circuit board 51 corresponds to the positioning portion 36. As shown in fig. 10, the second rib 34 is perpendicular to the first rib 33, and an end of the second rib 34 corresponds to the abutment portion 331 of the first rib 33. By making the second rib 34 perpendicular to the first rib 33 and using the lower end of the second rib 34 to correspond to the abutting portion 331, only the end of the second rib 34 contacts the second circuit board 51 when in use, so that the contact area between the second rib 34 and the second circuit board 51 can be reduced, and the resistance when the second circuit board 51 is inserted can be reduced.

As shown in fig. 10 and 11, the ratio of the width a of the card slot 35 to the thickness b of the second circuit board 51 is 1: 0.9-1.25, and the first rib 33 is made of an elastic material, so that the card slot 35 can be compatible with the second circuit board 51 having a thickness within a certain range, and the application range is wider. Preferably, the ratio of the width a of the card slot 35 to the thickness b of the second circuit board 51 is 1: 1-1.2, so that the second circuit board 51 is not loosened after being installed in the card slot 35.

As shown in fig. 12, the second rib 34 extends in the axial direction of the base 3. The end of the second rib 34 remote from the end wall 32 in the axial direction of the base 3 is provided with a third guide portion 341, and the height of the third guide portion 341 gradually decreases with respect to the inner circumferential surface of the side wall 31 in the process of being remote from the end wall 32. Thereby, the insertion of the second circuit board 51 is facilitated.

The ratio of the thickness of the first rib 33 to the wall thickness of the side wall 31 (the wall thickness of the side wall 31 at the contact part with the first rib 33) is 1: 0.8-2.5, that is, the thickness of the first rib 33 is relatively uniform with respect to the wall thickness of the side wall 31. The first rib 33 is integrally molded with the base 3 by resin, and when the first rib 33 is molded on the inner peripheral surface of the side wall 31 at the thickness (in the case where the thickness is relatively uniform), the outer peripheral surface of the side wall 31 is less likely to be marked. If the thickness of the first rib 33 is too thick (exceeds the above ratio), on the one hand, the elasticity of the first rib 33 and thus the insertion of the second circuit board 51 is affected, and on the other hand, a mark (a sink mark) is formed on the outer peripheral surface of the side wall 31 when the outer peripheral surface of the side wall 31 is molded due to the fluidity and the internal stress of the resin, resulting in a failure of the base 3.

As shown in fig. 12, the first guide portion 3312, the second guide portion 361, and the third guide portion 341 are disposed in the direction of the card slot 35 so as to be able to act on the second circuit board 51.

As shown in fig. 12, the base 3 has a proximal end 37 on the other side axially opposite the end wall 32. The first rib 33 is spaced from the proximal end 37 at an end axially adjacent the proximal end 37 a different distance than the second rib is spaced from the proximal end at an end axially adjacent the proximal end 37. Preferably, the first rib 33 is spaced closer to the proximal end 37 than the second rib is spaced closer to the proximal end 37. That is, during the insertion process of the second circuit board 51, the first rib 33 corresponds to the first rib 33, and the first rib 33 provides a supporting or guiding function for the second circuit board 51, and then corresponds to the second rib (the second circuit board 51 is inserted into the card slot 35), so that the insertion of the second circuit board 51 is facilitated. If the first rib 33 is spaced from the proximal end 37 by the same distance as the second rib is spaced from the proximal end 37, the second circuit board 51 needs to be aligned with the entrance of the card slot 35 at first, which increases the difficulty of inserting the second circuit board 51.

As shown in fig. 14, a lamp holder 3 according to an embodiment of the present invention can be applied to a LED straight lamp. The difference between the base 3 of the present embodiment and the base 3 of the previous embodiment (the base 3 shown in fig. 10 to 12) is that the second rib 34 is protruded from the inner circumferential surface of the sidewall 31, and the second rib 34 is parallel or substantially parallel to the first rib 33. The first rib 33 and the second rib 34 form a card slot 35, and the second circuit board 51 is clamped into the card slot 35 for fixing. In order to reduce the contact area between the card slot 35 and the second circuit board 51, at least one of the first rib 33 and the second rib 34 is provided with the abutting portion 331. Preferably, the first rib 33 and the second rib 34 are each provided with an abutment portion 331.

In the above embodiments, when the second circuit board 51 is disposed in the base 3, the second circuit board 51 keeps a distance from the axis of the base 3, so that the first surface 511 of the second circuit board 51 corresponds to more space in the base 3, and the second surface 512 of the second circuit board 51 corresponds to relatively less space in the base 3. Therefore, the electronic components of the power supply 5 are disposed, and the electronic components with a large volume, such as a capacitor, a transformer, an inductor, etc., are disposed on the first surface 511, while the electronic components with a small volume, such as a chip resistor, a chip capacitor, an IC (control circuit), etc., are disposed on the second surface 512.

As shown in fig. 15 and 16, a lamp cap 3 according to an embodiment of the present invention can be applied to a LED straight lamp. The base 3 includes a body 301 and an insulating portion 302, the insulating portion 302 forms at least a part of an end portion of the base 3, and the hollow conductive pin 4 is disposed on the insulating portion 302. The insulating portion 302 has an inner side surface 3021, the inner side surface 3021 is provided with a card slot 3022, and the longitudinal width of the card slot 3022 matches with the second circuit board 51, so that the second circuit board 51 can be clamped into the card slot 3022 for fixing, thereby achieving the function of fixing the power supply 5 in the lamp holder 3. Specifically, the card slot 3022 restricts the up-and-down movement of the power supply 5 along the surface of the second circuit board 51. The material of the main body 301 in this embodiment is aluminum or aluminum alloy, and the insulating portion 302 is made of insulating material in the prior art, such as plastic, ceramic, etc. In this embodiment, two sets of card slots 3022 are disposed, and the two sets of card slots 3022 are symmetrically disposed on the insulating portion 302, and the second circuit board 51 can be inserted into one of the two sets of card slots 3022 according to actual assembly conditions. Specifically, the two sets of slots 3022 are symmetrically disposed with respect to a plane passing through the axis of the lamp 1 and parallel to the second circuit board 51.

Referring to fig. 16 and 17, in the present embodiment, the insulating portion 302 includes a bottom wall 3023, a first side wall 3024, and a second side wall 3025, the bottom wall 3023, the first side wall 3024, and the second side wall 3025 form the card slot 3022, and an end portion of the bottom wall 3023 forms a bottom of the card slot 3022. Since the end of the bottom wall 3023 is spaced from the inner side surface 3021, the second circuit board 51 can be spaced from the inner side surface 3021 after the second circuit board 51 of the power supply 5 is inserted into the card slot 3022, so as to provide a passage for air to flow when the space above and below the second circuit board 51 flows convectively.

Referring to fig. 16 and 17, in the present embodiment, the first side wall 3024 has a first abutment surface 30241, the second side wall 3025 has a second abutment surface 30251, and the first abutment surface 30241 and the second abutment surface 30251 together constitute side walls of both sides of the card slot 3022. In this embodiment, the width or area of the first abutting surface 30241 is configured to be larger than the width or area of the second abutting surface 30251 (where the width refers to the dimension in the width direction of the lamp tube 1). During the insertion of the second circuit board 51 into the card slot 3022, the second abutting surface 30251 provides a smaller frictional force when it contacts the second circuit board 51 due to its smaller width or area; after the second circuit board 51 is inserted into the card slot 3022, the first abutting surface 30241 provides better support for the second circuit board 51 due to its larger width or area, so as to improve the stability of fixing the power supply 5.

Referring to fig. 16 and 17, in the present embodiment, the first side wall 3024 has a first guide surface 30242, the second side wall 3025 has a second guide surface 30252, and the first guide surface 30242 and the second guide surface 30252 together form an opening of the card slot 3022 to facilitate insertion of the second circuit board 51 into the card slot 3022 from the opening.

Referring to fig. 16 and 17, in the present embodiment, the end portion of the second circuit board 51 is provided with a stopper portion 5011, and the bottom wall 3023 of the stopper portion 5011 is fitted to restrict the movement of the second circuit board 51 in the width direction thereof.

Specifically, the limiting portion 5011 includes a notch 5111, and the bottom wall 3023 is snapped into the notch 5111, so as to limit the movement of the second circuit board 51 in the width direction thereof. The notch 5111 in this embodiment is circular arc.

In this embodiment, the ratio of the depth of the card slot 3022 to the length of the second circuit board 51 is at least 0.08 or more. Therefore, the stability of the card slot 3022 when fixing the second circuit board 51 is improved. Preferably, the ratio of the depth of the card slot 3022 to the length of the second circuit board 51 is at least 0.1 or more. More preferably, the ratio of the depth of the card slot 3022 to the length of the second circuit board 51 is at least 0.12 or more. The depth of the slot 3022 in this embodiment is 2 to 5 mm.

In this embodiment, the ratio of the width of the card slot 3022 to the thickness of the second circuit board 51 is 0.9-1.2: 1, so as to achieve a suitable tightness, and on one hand, the card slot 3022 is prevented from preventing a circuit layer of the second circuit board 51 from being damaged by the card slot 3022 when the second circuit board 51 is inserted into the card slot 3022, and preventing the power supply 5 from having an excessive shaking space due to too loose of the second circuit board 51 when inserted into the card slot 3022. Preferably, the ratio of the width of the card slot 3022 to the thickness of the second circuit board 51 is 0.95 to 1.1: 1. More preferably, the ratio of the width of the card slot 3022 to the thickness of the second circuit board 51 is 0.95 to 1: 1.

Referring to fig. 18, in the present embodiment, in order to increase the withstand voltage of the base 3, a certain linear distance is maintained between the hollow conductive pin 4 and the body 301 of the base 3 by the insulating portion 302. Preferably, the creepage distance between the hollow conductive needle 4 and the body 301 of the lamp cap 3 is at least 4mm cumulatively. Preferably, the creepage distance between the hollow conductive needle 4 and the body 301 of the lamp cap 3 is at least 4.5mm in total. Preferably, the creepage distances between the hollow conductive pin 4 and the body 301 of the lamp cap 3 add up to at least 5 mm. As shown, the creepage distance between the hollow conductive pin 4 and the body 301 of the lamp cap 3: the device is divided into four sections of lengths a, b, c and d, and the lengths satisfy the following conditions: a + b + c + d is more than or equal to 4 mm.

In the present embodiment, the size of a is 0.5mm to 1mm, so as to accommodate the end of the hollow conductive pin 4 in the width direction and to facilitate the mounting and fixing of the hollow conductive pin 4 (the end of the hollow conductive pin 4 protrudes in the radial direction thereof compared to the main body of the hollow conductive pin 4).

In this embodiment, the size of b is 0.35mm to 0.5mm so as to accommodate the end of the hollow conductive pin 4 in the length direction of the hollow conductive pin 4.

In this embodiment, the dimension of c is 1.8mm to 3mm to ensure the mechanical strength of the insulating portion 302.

Referring to fig. 18 and 19, in the present embodiment, a convex portion 3026 is disposed on the outer edge of the insulating portion 302, and the end portion of the body 301 has a hole 311 substantially matching the outer contour of the insulating portion 302. The body 301 is pressed to form the groove 3012, so that the projection 3026 is located in the groove 3012 and the insulating portion 302 is fixed.

In this embodiment, the shortest distance between the second circuit board 51 and the inner wall of the main body 301 in the width direction of the lamp tube 1 is greater than 3mm, so as to ensure that the second circuit board 51 and the main body 301 have a sufficient distance. Compare current metal lamp holder, current metal lamp holder does not have the effective fixed to the second circuit board of power, consequently, the inside wall of the body of current metal lamp holder can't be fixed with the distance of second circuit board, causes the body contact of second circuit board and metal lamp holder easily, leaves the potential safety hazard.

Referring to fig. 15, the lamp 1 in the present embodiment includes a body region 102 and end regions 101 respectively located at two ends of the body region 102, and the body 21 of the lamp cap 3 is sleeved on the end regions 101. The outer diameter of the end region 101 is smaller than the outer diameter of the body region 102. The lamp cap 3 is sleeved on the end region 101, and the difference between the outer diameter of the lamp cap 3 and the outer diameter of the lamp body region 102 is reduced or is completely flat, or the outer diameter of the lamp cap 3 is smaller than the outer diameter of the lamp body region 102. The advantage that sets up like this lies in, and in the transportation, the packing bearing is difficult to contact lamp holder 3 to can not make lamp holder 3 become only stress point, avoid lamp holder 3 and the position that the terminal district 101 of fluorescent tube is connected to take place to break because stress concentration, improve the quality of product, and have pleasing to the eye effect concurrently.

The first circuit board 2 in this embodiment is a flexible circuit board or a flexible circuit board, most (for example, more than 90%) of the first circuit board 2 is fixed on the inner circumferential surface of the lamp tube 1, and a free portion 2001 is formed at a portion that is not fixed on the inner circumferential surface of the lamp tube 1, and the free portion 2001 is fixed to the second circuit board 51 by welding. During assembly, the free portion 2001 and the second circuit board 51 are soldered at one end to bring the free portion 51 to contract toward the inside of the lamp 1, and finally form an "S" shape or a "Z" shape (side view from the lamp).

In this embodiment, the second circuit board 51 has a first surface and a second surface, wherein the first surface is provided with an electronic component 52, and the electronic component 52 includes a capacitor, an electrolytic capacitor, a fuse, or a transformer. The distance between the part of the first circuit board 2 attached to the inner circumferential surface of the lamp tube 1 and the second surface of the second circuit board 51 in the width direction of the lamp tube 1 is greater than 3.5 mm. To ensure that there is sufficient space between them to accommodate the free portion 2001 to prevent the pins of the electronic components 52 on the second circuit board 51 from damaging the free portion 2001 of the first circuit board 2. Moreover, the distance between the portion of the first circuit board 2 attached to the inner circumferential surface of the lamp tube 1 and the second surface of the second circuit board 51 in the width direction of the lamp tube 1 is less than half of the diameter of the inner circumferential surface of the lamp tube 1, so as to ensure that there is enough space between the first surface of the second circuit board 51 and the inner circumferential surface of the lamp tube 1 to accommodate the electronic component 2.

The LED straight lamp in the embodiment is T8 model, and the outer diameter of the lamp tube 1 is approximately 25.4 mm.

Referring to fig. 20, an embodiment of the present invention provides a connection structure between a power supply 5 and a first circuit board 2, which can be applied to a LED straight lamp, wherein the first circuit board 2 and a second circuit board 51 are connected through a connection portion. The connecting part can adopt a lead, a male and female plug, a pin header and the like. The connection portion in this embodiment is the third circuit board 7, that is, the first circuit board 2 and the second circuit board 51 are connected by the third circuit board 7, so that the light source 21 and the power supply 5 are electrically connected.

The thermal conductivity of the first circuit board 2 in the present embodiment is better than that of the third circuit board 7, and specifically, the thermal conductivity of the first circuit board 2 may be higher than that of the third circuit board 7, or the first circuit board 2 may conduct more heat per unit time than the third circuit board 7 (assuming the same other conditions). Therefore, the heat generated by the light source 21 during operation can be quickly conducted to the lamp tube 1 through the first circuit board 2, and can be dissipated to the outside through the lamp tube 1. In addition, the heat generated by the light source 21 is not easily conducted to the third circuit board 7, thereby affecting the power supply 5.

The thermal conductivity of the third circuit board 7 in the present embodiment is better than that of the second circuit board 51, and specifically, the thermal conductivity of the third circuit board 7 may be larger than that of the second circuit board 62, or the third circuit board 7 may conduct more heat per unit time than the second circuit board 51 (assuming the same other conditions). In this embodiment, the electronic components 52 of the power supply 5 include heating elements, such as resistors, transformers, inductors, ICs (integrated circuits), etc., in order to enhance the heat dissipation of the power supply 5, at least one of the heating elements 52 may thermally contact the third circuit board 7, and the third circuit board 7 may thermally contact the lamp tube 1, so that a part of the power supply 5 may be thermally conducted to the lamp tube 1 through the third circuit board 7 for heat dissipation. In other embodiments, the heat generating elements of the electronic component 6 may not directly contact the third circuit board 7, but may dissipate heat to the third circuit board 7 by means of heat radiation.

In summary, the thermal conductivity of the first circuit board 2, the third circuit board 7 and the second circuit board 51 in this embodiment is sequentially reduced.

In this embodiment, the hardness of the first circuit board 2 is greater than that of the third circuit board 7, so for the first circuit board 2, the first circuit board 2 can better bear and support the light source 21, and for the third circuit board 7, the third circuit board 7 has a bendable characteristic, so that when the first circuit board 2 and the second circuit board 51 are connected through the third circuit board 7, more adjustable space is provided, and the connection can be performed more conveniently. In the present embodiment, the first circuit board 2 may be any one of a strip-shaped aluminum substrate and a glass cloth substrate (FR 4).

In this embodiment, the hardness of the second circuit board 62 is greater than that of the third circuit board 7, so that the second circuit board 51 can better bear and support the electronic components 52 of the power supply 5. When the power supply 5 and the third circuit board 7 are stacked, the third circuit board 7 can be bent and deformed to accommodate the power supply 5, so as to prevent the arrangement of the third circuit board 7 from affecting the normal installation of the power supply 5.

Specifically, the first circuit board 2 in this embodiment is fixed on the inner circumferential surface of the lamp tube 1, the third circuit board 7 is not fixed on the inner circumferential surface of the lamp tube 1, and the third circuit board 7 may be a flexible circuit board or a flexible circuit board. The second circuit board 51 has two ends (a first end and a second end, wherein the first end is closer to the base 3 that is matched therewith) in the axial direction of the lamp tube 1, wherein one end is closer to the base 3 that is matched therewith, one end of the second circuit board 51 closer to the base 3 that is matched therewith is connected to one end of the third circuit board 7, and the other end of the third circuit board 7 is connected to the first circuit board 2. In the assembling and connecting process, the second circuit board 51 can be inserted into the lamp tube 1, then one end of the second circuit board 51 closer to the lamp holder 3 matched with the second circuit board is connected with one end of the third circuit board 7, and as the tube entering is completed in advance, the second circuit board 51 is not required to be inserted into the lamp tube 1 integrally after the second circuit board 51 is connected with the first circuit board 2 like the prior art, so that the difficulty of the production process is reduced, and the problem that the second circuit board 51 is difficult to enter the tube in the prior art is solved. In this embodiment, the second circuit board 51 and the third circuit board 7 may be connected by a connector such as a male/female plug, a pin header, or the like, or the second circuit board 51 and the third circuit board 7 may be directly connected by soldering.

Referring to fig. 20 and 21, in the present embodiment, the third circuit board 7 and the first circuit board 2 may be directly soldered, or may be connected by using a male and female pin, a pin header, or the like. Preferably, the third circuit board 7 in the present embodiment is connected to the first circuit board 2 by soldering. Specifically, one end of the first circuit board 2 has a first land 201, and one end of the third circuit board 7 has a second land 71, and the first land 201 and the second land 71 are directly connected by soldering (via soldering).

In this embodiment, the first pad 201 is spaced apart from the end of the first circuit board 2 in the length direction to form a connection section 202, and one end of the third circuit board 7 is placed on the connection section 202, so that the second pad 71 corresponds to the first pad 201 in the length direction of the lamp tube 1. The connection section 202 is a part of the first circuit board 2, and has a hardness greater than that of the third circuit board 7, so that the third circuit board 7 can be supported well to facilitate the connection. When the third circuit board 7 is placed at the connection section, the end of the third circuit board 7 abuts against the first pad 201 (or keeps a distance as small as possible, for example, the distance between the end of the third circuit board 7 and the first pad 201 in the length direction of the lamp tube 1 is less than 0.5mm), and at this time, the first pad 201 and the second pad 71 may contact each other, or a smaller distance is kept, so as to further facilitate the connection. In this embodiment, the number of the first pads 201 and the second pads 71 is 3, and the first pads and the second pads correspond to each other one by one. The number of the first pads 201 and the second pads 71 is not limited to the embodiment, and the specific number depends on the circuit design requirement.

In the present embodiment, the first pads 201 are provided on the side of the first circuit board 2 having the light source 21. And the second pads 71 are disposed on a side of the third circuit board 7 relatively close to the electronic components 52.

When the second circuit board 51 is actually connected to the third circuit board 7, the end portions of the second circuit board 51 and the third circuit board 7 are both partially exposed outside the lamp tube 1, the end portions of the second circuit board 51 and the third circuit board 7 are connected to the outside of the lamp tube 1, and after the second circuit board 51 is connected to the third circuit board 7, the second circuit board 51 and the third circuit board 7 are pushed into the lamp tube 1. Under this condition, the third circuit board 7 is configured as a flexible circuit board, so that when the second circuit board 51 and the third circuit board 7 are plugged into the lamp tube 1, the third circuit board 7 can be bent to complete the above-mentioned actions. In this embodiment, when the third circuit board 7 is in a flat state, the end portion thereof at least partially protrudes beyond the lamp tube 1 in the axial direction of the lamp tube 1.

In this embodiment, the second circuit board 51 and the third circuit board 7 are separated by the electronic component 52, so that the risk of sparking of the second circuit board 51 and the third circuit board 7 due to contact is reduced. The electronic components 52 include relatively large components such as capacitors, transformers, and inductors to ensure a sufficient distance between the second circuit board 51 and the third circuit board 7.

In this embodiment, the second circuit board 51 and the third circuit board 7 are respectively located at two opposite sides of the lamp tube 1 in the width direction of the lamp tube 1. In other words, the lamp tube 1 has a central axis, and a plane parallel to the second circuit board 51 passes through the central axis of the lamp tube 1, and the second circuit board 51 and the third circuit board 7 are respectively located at two sides of the plane. In this way, on the one hand, a certain distance between the first circuit board 2 and the second circuit board 51 is ensured, so that the risk of sparking of the first circuit board 2 and the second circuit board 51 due to contact is reduced.

In this embodiment, the thickness of the third circuit board 7 is smaller than that of the second circuit board 51, and when the power supply 5 and the third circuit board 7 are stacked and the inner diameters of the lamps 1 are the same, the thickness of the third circuit board 7 is controlled to provide more space for disposing the power supply 5, so as to facilitate the power supply 5 to select and arrange the electronic components 52 more easily. In the present embodiment, the thickness of the third circuit board 7 is also smaller than the thickness of the first circuit board 2.

Referring to fig. 22, in another embodiment, an LED straight tube lamp is provided, which has a similar basic structure to the LED straight tube lamp of the previous embodiment, except that the first circuit board 2 is fixed on the inner circumferential surface of the lamp tube 1, the third circuit board 7 is not fixed on the inner circumferential surface of the lamp tube 1, and the third circuit board 7 may be a flexible circuit board or a flexible circuit board. The second circuit board 51 has a first end and a second end in the axial direction of the lamp tube 1, wherein the first end is closer to the lamp cap 3 matched with the first end, the second end of the second circuit board 51 is connected with one end of the third circuit board 7, and the other end of the third circuit board 7 is connected with the first circuit board 2. In the assembling and connecting process, the second circuit board 51 is completely exposed outside the lamp tube 1, so that the second end thereof is exposed outside the lamp tube 1, and the end portion of the third circuit board 7 is exposed outside the lamp tube 1, so that the second end of the second circuit board 51 is conveniently connected with the end portion of the third circuit board 7, and after the connection is completed, the second circuit board 51 is pushed into the lamp tube 1. In this embodiment, the second circuit board 51 and the third circuit board 7 may be connected by a male/female plug, a pin header connector, or the second circuit board 51 and the third circuit board 7 may be directly connected by soldering.

Referring to fig. 23 to 29, an embodiment of the present invention provides a connection mode between a power supply 5 and a hollow conductive needle 4, the LED straight tube lamp in this embodiment includes a connection wire 8, the hollow conductive needle 4 is fixed on a lamp holder 3, one end of the connection wire 8 is electrically connected to the hollow conductive needle 4 (the connection wire 8 is electrically connected to the hollow conductive needle 4 through a contact), the other end of the connection wire is connected to a second circuit board 51, the connection wire 8 is configured to be fused when a certain temperature is reached (for example, when the temperature reaches 300 ℃), that is, when the LED straight tube lamp works and an arc discharge phenomenon occurs and a certain temperature is reached, the connection wire 8 is fused, and plays a role of over-temperature protection, so as to prevent the LED straight tube lamp from further damage due to combustion. In order to achieve the above object, the connecting lead 8 may include a fusing part 81, and the fusing part 81 may be made of a conductive material having a low melting point so as to achieve the object that the connecting lead 8 is fused at the fusing part 81 at a certain temperature (at the melting point of the fusing part 81), thereby breaking the connecting lead 8. The fusing part 81 may be made of a low melting point alloy (e.g., melting point lower than 300 deg.C) having bismuth, cadmium, tin, lead, dysprosium, or indium, or a combination thereof as a main component. And the low-melting point materials of the elements or the combination thereof can be configured to have different melting points, so that the materials can be specifically selected according to actual requirements.

In the present embodiment, the melting point of the fusing part 81 is less than or equal to the melting point of any electronic component on the second circuit board, the second circuit board itself, or an electronic component for connecting the second circuit board and the second circuit board. From another perspective, the melting point of the fusing part 81 is less than or equal to the melting point of any conductive substance on the second circuit board. To ensure that the fuse 81 is first broken when the temperature is too high, so as to avoid short circuit or even fire on the second circuit board caused by the melting of the conductive material on the second circuit board.

As shown in fig. 23, in the present embodiment, the entire connecting wire 8 is constituted by the fusing portion 81, that is, the entire connecting wire 8 is made of a conductive material having a low melting point. In other embodiments, the connecting wires 8 may only include a partial fusing portion 81 (as shown in fig. 13), which may reduce the cost when the material cost of the fusing portion 81 is high (compared to the connection), and in this embodiment, the fusing portion 81 has a melting point lower than that of the rest of the connecting wires 8.

In other embodiments, if the second circuit board is connected to the first circuit board through a connecting wire, the connecting wire for connecting the second circuit board to the first circuit board may also adopt the above technical solution, i.e. the connecting wire 8 includes the fusing part 81. So as to achieve the effect of arc discharge protection (over-temperature protection).

As shown in fig. 23, in order to prevent the occurrence of a short circuit of the fusion portions 81 of the two connecting wires 8 due to contact after the fusion portions 81 are melted, the following arrangement may be made: the distance between the two hollow conductive pins 4 is L1, and the length L2 of the fusing part 81 of the connecting lead 8 is set shorter than the distance between the two hollow conductive pins 4 is L1, so that when the two hollow conductive pins 4 are set one above the other, even if the fusing part 81 is melted and one end is separated from the second circuit board, the fusing part 81 is bent by gravity and cannot contact the connecting lead 8 below due to its length. Referring to fig. 17, a schematic view is shown in which the upper fusing part 81 is bent downward. As shown in fig. 29, if the entire connecting lead 8 is formed of the fusing part 81, the length L2 of the fusing part 81 is calculated as the portion of the connecting lead 8 exposed outside the hollow conductive pin 4.

In some extreme cases, the fusing part 81 is melted and one end is separated from the second circuit board, the fusing part 81 is bent due to gravity, and the fusing parts 81 of the two connecting wires 8 are simultaneously bent relatively, at this time, the length L2 of the fusing part 81 can be set to be less than half of the distance L1 between the two hollow conductive pins 4, that is, even if the fusing parts 81 are bent relatively, a short circuit will not occur. Referring to FIG. 28, two fusing parts 81 are bent relative to each other.

As shown in fig. 26, the connection of the connection lead 8 to the second circuit board 51 is shown. The second circuit board 51 is provided with an adsorption part 514, and one end of the fusing part 81 of the connecting wire 8 is electrically connected to the adsorption part 514. The sucking part 514 is made of conductive material, and after the end of the fusing part 81 connected to the sucking part 514 is melted, the sucking part 514 can suck and gather the melted fusing part 81 to prevent the melted fusing part 81 from flowing to other places to cause short circuit. When the fuse portion 81 is made of tin or tin-based material, the absorption portion 514 is made of metal, especially copper, which has the function of absorbing and gathering the fuse portion 81. The melting point of the adsorption portion 514 is higher than that of the fusion portion 81.

Referring to fig. 24, fig. 24 shows a schematic view of a circuit board of an LED straight tube lamp in an embodiment. The circuit board in this embodiment includes at least two connection portions 91, and the connection portions 91 are electrically connected (electrically connected). Specifically, the connection portions 91 are electrically connected to each other through the connection unit 92, and the connection unit 92 includes a fusing portion 921, and when the vicinity of the connection portions 91 is arc-discharged or the temperature is too high, the fusing portion 921 is melted to break the electrical connection between the connection portions 91. Fusing part 921 can adopt the conducting material of low melting point (melting point is less than 300 ℃) to reach the purpose that connecting element 92 fuses at fusing part 921 when the constant temperature, thereby make connecting element 92 disconnection, make two connecting portion 91 form the open circuit, thereby play the guard action (draw arc protection, excess temperature protection). Compared with the prior art that two connecting parts are connected by adopting a wire or connected by copper foil wiring, the safety is improved. The fuse 921 may be made of a low melting point alloy (melting point less than 300 ℃) containing bismuth, cadmium, tin, lead, dysprosium, or indium, or a combination thereof as a main component. And the low-melting point materials of the elements or the combination thereof have different melting points, so that the low-melting point materials can be selected according to actual requirements.

In the present embodiment, the connection unit 92 may be constituted by only the fusing part 921. In other embodiments, the connecting unit 92 includes only a portion of the fusing part 921, which can reduce the cost when the material cost of the fusing part 921 is high.

In this embodiment, the circuit board may be the second circuit board 51 or the first circuit board 2, or may be other components having a connecting portion.

As shown in fig. 25, in an embodiment, an absorbing unit 93 may be further disposed between the two connecting portions 91, the fusing portion 921 at least partially contacts the absorbing unit 93, and after the fusing portion 921 is melted, the absorbing unit 93 absorbs the fusing portion 921, so that the melted material of the fusing portion 921 is gathered, thereby ensuring that the fusing portion 921 is melted and is in a disconnected state due to the absorbing action of the absorbing unit 93. For example, when the fuse 921 is made of tin or tin-based material, the absorption unit 93 is made of material that is easy to absorb tin, such as metal material, especially copper. Alternatively, the absorbing unit 93 may be made of the same material as the connecting portion 91 to absorb the melted material of the fusing portion 921.

In this embodiment, the melting point of the fusing portion 921 is less than or equal to the melting point of any electronic component on the circuit board, the circuit board itself, or the electronic component used for connecting the circuit board and the circuit board. On the other hand, the melting point of the fusing part 921 is less than or equal to the melting point of any conductive material on the circuit board. When the temperature is too high, the fuse 921 is first cut off to avoid short circuit and even fire on the circuit board caused by melting of the conductive material on the circuit board.

Preferably, in this embodiment, the connection portion 91, the absorption unit 93 and the circuit board corresponding to the fusing portion 921 are made of a material with a melting point higher than that of the fusing portion 921, so as to ensure that the connection portion 91, the absorption unit 93 and the circuit board are not melted before the fusing portion 921 is fused.

It is to be understood that the above description is intended to be illustrative, and not restrictive. Many embodiments and many applications other than the examples provided will be apparent to those of skill in the art upon reading the above description. The scope of the present teachings should, therefore, be determined not with reference to the above description, but should instead be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference for all purposes. The omission in the foregoing claims of any aspect of the subject matter that is disclosed herein is not intended to forego such subject matter, nor should it be construed that the utility model does not contemplate that such subject matter is part of the disclosed utility model subject matter.

Claims

1. An LED straight lamp comprising:

a lamp tube;

a power source;

two lamp caps respectively arranged at two ends of the lamp tube; and

the hollow conductive needle is fixed on the lamp holder;

2. The LED straight lamp according to claim 1, wherein: the melting point of the fusing part is less than or equal to the melting point of any conductive substance on the second circuit board.

3. The LED straight lamp according to claim 1, wherein: the connecting leads are integrally formed of the fusing parts.

4. The LED straight lamp according to claim 1, wherein: the connecting wire includes only a partial fusing portion having a melting point lower than that of the remaining portion of the connecting wire.

5. A LED straight tube lamp according to claim 3, wherein: the length of the part of the connecting lead exposed out of the hollow conductive needles is shorter than the distance between the two hollow conductive needles.

6. A LED straight tube lamp according to claim 3, wherein: the length of the part of the connecting lead exposed out of the hollow conductive needles is less than half of the distance between the two hollow conductive needles.

7. The LED straight lamp according to claim 1, wherein: and the second circuit board is provided with an adsorption part, and one end of the fusing part of the connecting wire is electrically connected with the adsorption part.

8. The LED straight lamp according to claim 7, wherein: the adsorption part is made of metal.

9. The LED straight lamp according to claim 7, wherein: the melting point of the adsorption part is higher than that of the fusing part.

10. The utility model provides a LED straight tube lamp, includes fluorescent tube, lamp holder, circuit board and hollow conductive needle, the lamp holder with the fluorescent tube is connected, hollow conductive needle set up in on the lamp holder, its characterized in that: the circuit board at least comprises two connecting parts, and the connecting parts are communicated through a connecting unit; the connection unit includes a fusing part.

11. The LED straight lamp according to claim 10, wherein: the connection unit is constituted only by the fusing part.

12. The LED straight lamp according to claim 10, wherein: the connection unit includes only a partial fusing part.

13. The LED straight lamp according to claim 10, wherein: an absorbing unit is arranged between the two connecting parts, and the fusing part at least partially contacts the absorbing unit.

14. An LED straight tube lamp according to claim 13, wherein: the absorption unit is made of metal.

15. The LED straight lamp according to claim 10, wherein: the melting point of the fusing part is less than or equal to the melting point of any conductive substance on the circuit board.

16. An LED straight tube lamp according to claim 13, wherein: the melting points of the materials of the connecting part, the absorbing unit and the circuit board are all higher than that of the fusing part.