CN216924089U

CN216924089U - LED lamp capable of preventing welding short circuit

Info

Publication number: CN216924089U
Application number: CN202123046618.6U
Authority: CN
Inventors: 宋宇超; 曹胜军; 蒲纪忠; 甘彩英; 赵艺佼
Original assignee: CH Lighting Technology Co Ltd
Current assignee: CH Lighting Technology Co Ltd
Priority date: 2021-12-06
Filing date: 2021-12-06
Publication date: 2022-07-08
Anticipated expiration: 2031-12-06

Abstract

The application discloses LED lamp, including the lamp body, set up in lamp strip and drive power supply in the lamp body, the lamp strip include flexible base plate and set up in LED lamp pearl on the base plate, drive power supply include the circuit board with set up in components and parts on the circuit board, the circuit board has a plurality of being close to the base plate and rather than welded first pad, the median has between two adjacent first pads. The drive power supply of this application LED lamp has avoided the continuous tin phenomenon when welding with the lamp strip, avoids drive power supply short circuit, has improved the yield, has improved production efficiency.

Description

LED lamp capable of preventing welding short circuit

Technical Field

The application relates to the technical field of lighting, in particular to an LED lamp capable of preventing short circuit during welding.

Background

The interior of the LED lamp generally includes a light bar and a driving power supply, and the driving power supply is provided with a pad welded to the light bar, and the pad is used to be electrically connected to the light bar, so as to transmit electric energy of an external power supply to the light emitting element. The number of the bonding pads is usually more than one, the volume of the driving power supply is small, tin is easily connected among the bonding pads during welding, the driving power supply is short-circuited, and particularly, when the bonding pad is applied to a machine welding process flow, such as a high-frequency welding process, the production efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide an LED lamp in order to solve the above technical problems.

LED lamp, including the lamp body, set up in lamp strip and drive power supply in the lamp body, the lamp strip include flexible base plate and set up in LED lamp pearl on the base plate, drive power supply include the circuit board with set up in components and parts on the circuit board, the circuit board has a plurality of being close to the base plate and rather than welded first pad, have the isolation tank between two adjacent first pads.

Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative may be combined individually for the above general solution or between several alternatives without technical or logical contradictions.

Optionally, the first pad is strip-shaped, and an extending direction of the first pad is consistent with an extending direction of the isolation groove.

Optionally, the width of the isolation groove is not greater than 3 mm.

Optionally, the minimum distance between the first pad distance and the component is greater than 5 mm.

Optionally, the circuit board includes a main body region where components are disposed and a blank region where components are not disposed, and the first pad is located in the blank region.

Optionally, the blank region is reduced in width relative to the body region.

Optionally, a plurality of second pads are arranged on the substrate, and the second pads are opposite to the first pads one to one.

Optionally, a plurality of counter bores are arranged on the first pad.

Optionally, the lamp housing includes a lamp tube and end caps disposed at two ends of the lamp tube, the lamp strip is fixed on an inner wall of the lamp tube by adhesion of an adhesive, the end caps include a side wall and an end wall which are sleeved on the lamp tube to form a tube shape, the length of the lamp strip is greater than that of the lamp tube, and an end portion of one end of the lamp strip is close to the circuit board and welded to the first bonding pad.

Optionally, the circuit board has a length direction and a width direction, and the first pad is disposed at an end of the circuit board in the length direction.

The LED lamp at least has the following technical effects: the driving power supply of the LED lamp avoids the tin connection phenomenon when being welded with the light-emitting element, avoids the short circuit of the driving power supply, improves the yield and improves the production efficiency.

Drawings

Fig. 1 is a schematic structural view of a lamp housing of an LED lamp according to an embodiment of the present application;

FIG. 2 is a schematic partial cross-sectional view of an LED lamp according to an embodiment of the present disclosure;

fig. 3 is a schematic structural view of a light bar in an LED lamp according to an embodiment of the present disclosure;

fig. 4 is a schematic perspective view of an LED lamp according to an embodiment of the present disclosure;

FIG. 5 is a schematic plan view of a third side of the circuit board according to an embodiment of the present application;

FIG. 6 is an enlarged view of portion A of FIG. 5;

fig. 7 is a schematic structural diagram of a circuit board according to an embodiment of the present application.

The reference numerals in the figures are illustrated as follows:

100. a lamp housing; 110. an end cap; 120. a lamp tube; 111. a side wall; 112. an end wall; 113. a lamp foot; 114. a limiting step;

200. a drive power supply; 210. a circuit board; 211. a third side; 212. a fourth side; 213. a first pad; 2131. a counter bore; 214. an isolation trench; 215. a body region; 216. a blank area; 217. a bar-shaped portion; 218. a limiting step; 219. chamfering; 220. a component;

300. a light bar; 301. a first side; 302. a second side surface; 314. a second pad; 310. a substrate; 311. an insulating layer; 312. a circuit layer; 313. a solder resist layer; 320. and (4) a lamp bead.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

In this application, the terms "comprises" and "comprising," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a system, article, or apparatus that comprises a list of elements is not necessarily limited to those elements explicitly listed, but may include other elements not expressly listed or inherent to such system or apparatus.

Referring to fig. 1 and fig. 2, in an embodiment of the present application, an LED lamp is provided, and includes a lamp housing 100, and a driving power supply 200 and a light bar 300 mounted inside the lamp housing 100, where the light bar 300 includes a flexible substrate 310 and LED lamp beads 320 disposed on the substrate 310, the driving power supply 200 includes a circuit board 210 and a component 220 disposed on the circuit board 210, and the substrate 310 and the circuit board 210 are directly welded to achieve electrical connection therebetween.

In an embodiment, as shown in fig. 1 and fig. 2, the lamp housing 100 includes a lamp tube 120 and end caps 110 disposed at two ends of the lamp tube 120, each end cap 110 includes a cylindrical side wall 111 and a flat end wall 112, wherein the side wall 111 is inserted into an end of the lamp tube 120, the two side walls are bonded by an adhesive, two lamp pins 113 are disposed on the end wall 112, and the lamp pins 113 are electrically connected to the driving power supply 200 or the light bar 300, so as to enable an external power supply to be connected to the LED lamp. The side wall 111 is further provided with a limit step 114, and the limit step 114 is abutted against the end surface of the lamp tube 120 during assembly.

The lamp tube 120 is generally a glass tube, and a diffusion film may be provided outside the tube for light diffusion, or a diffusion layer may be formed by coating a diffusion material on the inner wall of the tube. The light bar 300 is fixed on the inner wall of the lamp 120 by glue, has a length greater than that of the lamp 120, and is separated from the lamp 120 at the end of the lamp so as to extend out of the lamp 120 and be connected with the driving power supply 200.

As shown in fig. 3 and 4, the substrate 310 of the light bar 300 is a flexible circuit board, and generally includes a three-layer structure, which includes an insulating layer 311, a circuit layer 312, and a solder resist layer 313 in sequence. The insulating layer 311 may be made of polymer material such as mylar or polyimide, and has very good flexibility due to its small thickness (usually less than 0.1 mm). The circuit layer 312 is a circuit structure disposed on the insulating layer, and is used for connecting the LED beads 320 of the substrate 310 in series or in parallel. The solder resist layer 313 is formed of a solder resist (white paint) coated on the substrate. The position that solder mask 313 welded LED lamp pearl has the window, can let circuit layer 312 expose to realize welding with LED lamp pearl 320 through filling the solder.

For convenience of description, the present application defines two side surfaces in the thickness direction of the substrate 310 as a first side surface 301 and a second side surface 302, respectively, wherein the LED lamp beads are disposed on the first side surface. At the first side, the end of the substrate 310 is provided with a plurality of second pads 314 for soldering with a driving power source. The second pad 314 remains electrically connected to the circuit layer 312.

The driving power supply 200 includes a circuit board 210 and components 220 thereon, the circuit board 210 may be a conventional PCB circuit board, and also includes an insulating layer, a circuit layer and a solder resist layer (usually green), in order to provide more components, the circuit board 210 has two circuit layers and two solder resist layers, so that components can be arranged on both sides thereof.

For convenience of description, the present application defines two sides of the circuit board 210 in a thickness direction as a third side 211 and a fourth side 212, and the circuit board 210 has a plurality of first pads 213 on the third side 211 for soldering with the light bar. In one embodiment, in order to improve the space utilization efficiency, the components 220 are soldered on the third side 211 and the fourth side 212. The embodiments of the present application explain the components of the LED lamp by using XYZ directions of a three-dimensional coordinate system attached to each figure. The X-axis direction, the Y-axis direction, and the Z-axis direction all represent the linear direction of the axial direction. The positive directions of the axes respectively indicate the directions of arrows in the XYZ directions. As shown, the fourth side 212 of the circuit board is located in the positive direction of the Z axis relative to the third side 211 by taking the plane of the circuit board 210 as a reference plane.

Referring to fig. 4 to 7, in one embodiment, the number of the first pads 213 and the second pads 314 is three, and the first pads and the second pads are disposed in a one-to-one correspondence. When soldering, the first pad 213 is aligned with the second pad 314, and both are soldered by non-contact means such as high frequency soldering. After the soldering is completed, the substrate 310 and the circuit board 210 have solder therebetween to achieve electrical connection therebetween. To avoid misconnection, the vicinity of the first pad 213 and the second pad 314 has a mark.

In one embodiment, an isolation groove 214 is disposed between two adjacent first pads 213, and the isolation groove 214 can avoid a short circuit problem caused by tin connection. Specifically, when the soldering is performed, the first pad 213 and the second pad 314 are attached, and after high-frequency heating, the solder on the pads is heated to be liquid and collected, and the isolation groove 214 completely separates the first pad 213, and the solder cannot be connected with each other when collected, so that the short circuit of the driving power supply caused by tin connection is avoided, and the yield and the production efficiency are improved. Because the width of the light bar 300 is limited, the width D1 of the isolation groove 214 should not be too large, preferably not more than 3mm, otherwise the width D2 of the first pad 213 is too small, and the soldering is not firm enough.

Further, a plurality of counter bores 2131 are arranged on the first pad 213, and when the first pad 213 and the second pad 314 are welded by solder, the counter bores 2131 can increase friction force and electrical contact area, and increase stability.

In order to avoid the influence of the high frequency soldering on the component 220, the distance L1 between the first pad 213 and the nearest component is not less than 5mm, as shown in the figure, the circuit board 210 includes a main body region 215 on which the component 220 is soldered and a blank region 216 on which the component 220 is not soldered, and the first pad 213 is located at the edge of the blank region 216.

The circuit board 210 has a length direction (Y-axis direction) and a width direction (X-axis direction), the main body region 215 and the blank region 216 are arranged along the length direction of the circuit board 210, and the blank region 216 is adjacent to the lamp 120. The end of the circuit board 210 far away from the lamp tube 120 is further extended with a strip-shaped part 217, the width of the strip-shaped part 217 is smaller than the average width of the circuit board 210 to form a limiting step 218, and the strip-shaped part 217 extends into the end cap of the LED to limit the position of the circuit board 210. The width of the blank region 216 is reduced relative to the body region 215, and the two sides of the end of the body region 215 connected to the blank region 216 have chamfers 219, which is designed to facilitate the driving power source 200 to protrude into the lamp tube 120.

All possible combinations of the technical features of the embodiments described above may not be described for the sake of brevity, but should be considered as being within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features. When technical features in different embodiments are represented in the same drawing, it can be seen that the drawing also discloses a combination of the embodiments concerned.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application.

Claims

The LED lamp comprises a lamp housing, a lamp strip and a driving power supply, wherein the lamp strip and the driving power supply are arranged in the lamp housing, the lamp strip comprises a flexible substrate and LED lamp beads arranged on the substrate, the driving power supply comprises a circuit board and components arranged on the circuit board, and the LED lamp is characterized in that the circuit board is provided with a plurality of first welding pads which are close to the substrate and welded with the substrate, and an isolation groove is arranged between every two adjacent first welding pads.
2. The LED lamp of claim 1, wherein the first pads are strip-shaped and extend in the same direction as the isolation grooves.
3. The LED lamp of claim 1, wherein the width of the isolation trench is no greater than 3 mm.
4. The LED lamp of claim 1, wherein the first pad distance is greater than 5mm from the minimum distance between components.
5. The LED lamp of claim 4, wherein the circuit board comprises a main body region where components are arranged and a blank region where no components are arranged, and the first pad is located in the blank region.
6. The LED lamp of claim 5, wherein the void region is reduced in width relative to the body region.
7. The LED lamp of claim 1, wherein a plurality of second pads are disposed on the substrate, the second pads being one-to-one opposed to the first pads.
8. The LED lamp of claim 1, wherein the first solder pad has a plurality of counter bores disposed thereon.
9. The LED lamp of claim 1, wherein the lamp housing comprises a lamp tube and end caps disposed at two ends of the lamp tube, the end caps comprise a tubular side wall and an end wall penetrating and covering the lamp tube, the lamp strip is fixed on the inner wall of the lamp tube by adhesion of glue, the length of the lamp strip is greater than that of the lamp tube, and one end of the lamp strip is close to the circuit board and is welded to the first pad.
10. The LED lamp of claim 9, wherein the circuit board has a length direction and a width direction, and the first land is provided at one end portion in the length direction of the circuit board.