CN108386749A - A kind of flexible LED rope light - Google Patents

Abstract

The embodiment of the invention discloses a kind of flexible LED rope lights comprising：At least two FPCB plates, at least two conductive main lines, at least one paster LED, electronic components are disposed on every FPCB plates, wherein, described at least two conductive main lines are at least two conductive copper pools for being laid in FPCB board bottoms portion, the at least two FPCB plates are intervally arranged successively, and there are preset distances between adjacent FPCB plates；Insulating bag covering layer is wrapped on at least two FPCB plates；It is further provided at least two parallel and spaced metal conductive strips between at least two FPCB board bottoms portion and the insulating bag covering layer, at least two metal conductive strips lower parts are provided with a flexible fixed bed.Implement the embodiment of the present invention, the mechanical strength of flexible light band can be improved, enhance the conductive capability of flexible light band, the use length of light bar and anti-bending performance can be improved.

Description

A flexible LED strip

technical field

The invention relates to the display field, in particular to a flexible LED light strip.

Background technique

As shown in Figure 1 and Figure 2, it shows an existing flexible LED light strip, which is usually provided with a circuit and a conductive main line on a flexible circuit board (FPCB) 4', and the FPCB board adopts surface mount technology (SMT) Welded SMD LED 3' and electronic components 2' (such as resistors, etc.).

In the specific finished LED light strip, it is necessary to wrap a layer of soft plastic material or silicone layer 5' on the flexible circuit board 4' soldered with SMD LEDs and electronic components 2 as shown in Figure 1, so as to be waterproof. , dustproof and form different shapes and optical effects, the specific structure can be seen in Figure 3.

But, there is following weak point in existing this structure:

First of all, in the production process, in order to ensure the softness of the LED light strip, the conductive copper used for the main conductive line should not be too thick; because the conductive copper is thin, its conductivity is limited, so if the light strip is connected to the power supply from one end, it will not be too thick. , the length of its continuous use is limited due to the voltage drop of the conductive main line, which brings great problems to the engineering application of this product;

At the same time, the stretching and bending strength of the flexible circuit board is low, and the existing flexible LED light strips are vulnerable to mechanical damage during engineering construction, resulting in products that cannot be used normally.

Contents of the invention

The technical problem to be solved by the present invention is to provide a flexible LED light strip, which can improve the mechanical strength and bending resistance of the flexible light strip, and enhance the electrical conductivity of the flexible light strip, thereby increasing the service length of the light strip.

In order to solve the above technical problems, an embodiment of the present invention provides a flexible LED light strip, which includes:

At least two FPCB boards, each FPCB board is arranged with at least two conductive main lines, at least one patch LED, and electronic components, wherein the at least two conductive main lines are at least two conductive lines laid on the bottom of the FPCB board. Copper mooring, the at least two FPCB boards are arranged at intervals in turn, and there is a predetermined distance between adjacent FPCB boards;

an insulating wrapping layer wrapped on the at least two FPCB boards;

At least two parallel and mutually spaced metal conductive strips are further arranged between the bottoms of the at least two FPCB boards and the insulating wrapping layer, and each of the metal conductive strips is connected to a conductive copper foil at the bottom of the FPCB board. For electrical connection, a flexible fixing layer is arranged under the at least two metal conductive strips.

Wherein, there is a gap between the at least two parallel metal conductive strips, and the upper surface of each metal conductive strip is at least partially exposed, and is respectively close to a conductive copper pad at the bottom of each FPCB board, and is respectively connected to each FPCB board. A conductive main line on the electrical connection.

Wherein, the two conductive copper pads at the bottom of each FPCB board are welded to the two metal conductive strips respectively through a solder joint, and the solder joints on the two conductive copper pads at the bottom of each FPCB board are welded to each other. The connection line is perpendicular to the length direction of the two metal conductive strips.

Wherein, at least one complete circuit unit is arranged on each FPCB board.

Wherein, the at least two metal conductive strips are copper strips, aluminum strips, steel strips or alloy strips of the above materials, and the insulating wrapping layer is a soft plastic layer or a silica gel layer.

Wherein, each of the metal conductive strips is a braided metal strip, or is formed of single or multiple strands of metal wires.

Wherein, the flexible fixing layer is an adhesive tape or a silica gel layer.

Wherein, an insulating and isolating part is arranged between the two metal conductive strips.

Wherein, the flexible fixing layer is an adhesive tape or a silicone layer, and the insulating and isolating part is a plastic strip.

Wherein, the flexible fixing layer is a silica gel layer, the insulating and isolating part is a silica gel layer, and the insulating and isolating part is integrally formed with the flexible fixing layer.

Implementing the embodiment of the present invention has the following beneficial effects:

First, the present invention can improve the mechanical strength of the flexible LED light strip by providing at least two metal conductive strips and a flexible fixing layer under the FPCB board of the flexible LED light strip;

At the same time, since the upper surfaces of the two metal conductive strips are closely attached to the conductive copper under the FPCB board, it is equivalent to increasing the effective current-carrying area, so that the voltage drop of the line can be made smaller in the case of single-ended power supply. So that the length of continuous use of the flexible LED light strip is longer;

In addition, because the present invention uses at least two FPCB boards arranged in sequence and arranged at intervals, since a certain interval is set between adjacent FPCB boards, the bending resistance of the light bar can be improved, and the FPCB can be protected to the greatest extent when it is bent. Components on the board are not damaged. In addition, since each section of the FPCB board is independent, even if one section of the FPCB board is damaged (for example, the light strip is wrongly bent or twisted to cause the flexible circuit board to break), it will not affect the normal operation of the other sections of the FPCB board .

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic diagram of the assembly structure of the FPCB board of the existing flexible LED light strip;

Fig. 2 is a schematic circuit diagram corresponding to Fig. 1;

Fig. 3 is a cross-sectional view after encapsulating the insulating wrapping layer in Fig. 1;

Fig. 4 is a cross-sectional view of a first embodiment of a flexible LED light strip provided by the present invention;

Fig. 5 is a schematic diagram of the cooperative relationship between the FPCB board, the metal conductive strip and the flexible fixed layer in Fig. 4;

Fig. 6 is a schematic diagram of assembly in one embodiment of Fig. 5;

Fig. 7 is a schematic diagram of assembly in another embodiment of Fig. 5;

Fig. 8 is a schematic circuit diagram of an embodiment of a flexible LED light strip provided by the present invention;

Fig. 9 is a cross-sectional view of a second embodiment of a flexible LED light strip provided by the present invention;

Fig. 10 is a schematic structural diagram of fixing the metal conductive strip and the flexible fixing layer in Fig. 9;

Fig. 11 is a schematic diagram of the coordination relationship between the metal conductive strip and the flexible fixing layer in the third embodiment of a flexible LED light strip provided by the present invention;

Fig. 12 is a schematic diagram of the cooperative relationship between the metal conductive strip and the flexible fixing layer in the fourth embodiment of a flexible LED light strip provided by the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

Here, it should also be noted that, in order to avoid obscuring the present invention due to unnecessary details, only the structures and/or processing steps closely related to the solution according to the present invention are shown in the drawings, and the related Other details are not relevant to the invention.

As shown in FIG. 4 , it shows a cross-sectional view of a first embodiment of a flexible LED light strip provided by the present invention, and refer to FIGS. 5-8 . In this embodiment, the flexible LED light strip includes:

At least two FPCB boards 4, each FPCB board is arranged with at least two conductive main lines, at least one patch LED 3 and electronic components 2 (such as resistors), wherein the at least two conductive main lines are laid on the At least two conductive copper pads at the bottom of the FPCB board, the at least two FPCB boards 4 are arranged at intervals in turn, and there is a predetermined distance between adjacent FPCB boards 4 (as shown in d in Figure 5, which can be such as 1mm); wherein , the connection relationship between the conductive main line, the SMD LED and the electronic components can refer to the contents of Figure 1 and Figure 2 in the previous article;

The insulating wrapping layer 5 is wrapped on the at least two FPCB boards 4, the insulating wrapping layer 5 is a soft plastic layer or a silicone layer, wherein the soft plastic layer can be made of materials such as PVC, PU or TPU, TPR, etc.;

Wherein, at least two parallel and mutually spaced metal conductive strips 7 (shown as two in the figure) are further arranged between the bottoms of the at least two FPCB boards 4 and the insulating wrapping layer 5, each of which is The metal conductive strip 7 is electrically connected to a conductive copper pad at the bottom of the FPCB board 4; a flexible fixing layer is provided at the bottom of the at least two metal conductive strips 7, and in this example, the flexible fixing layer is a silicone layer 6 , the silica gel layer 6 half-wraps and fixes the lower parts of the two metal conductive strips 7 .

Wherein, there is a gap between the at least two parallel metal conductive strips 7, and the upper surface of each metal conductive strip 7 is at least partially exposed, and is respectively close to a conductive copper pad at the bottom of each FPCB board 4, and is respectively connected to each A conductive main line on an FPCB board is electrically connected.

As shown in Figure 6, in one embodiment, each of the FPCB boards 4 is directly placed on the metal conductive strip 7, and then wrapped and fixed through the insulating wrapping layer 5, wherein the FPCB board 4 underside The conductive copper pad is in direct contact with the metal conductive strip 7 to realize electrical connection; when power is supplied to the metal conductive strip 7, the FPCB board 4 on it can work normally.

As shown in Figure 7, in another embodiment, the two conductive copper pads at the bottom of each FPCB board 4 are welded to the two metal conductive strips 7 through a welding point 40 respectively, and each FPCB The connection line between the solder joints 41 on the two conductive copper pads at the bottom of the board 4 is perpendicular to the length direction of the two metal conductive strips 7 . In this way, the fixing procedure between the FPCB board 4 and the metal conductive strip 7 can be further improved. In addition, since the connection line between the solder joints 41 is perpendicular to the length direction of the two metal conductive strips 7, even during use, the When the flexible LED strip is bent, it can also ensure that there will be no misalignment between the FPCB board 4 and the metal conductive strip 7 .

It can be understood that, in the embodiment of the present invention, an insulating and isolating member 70 is arranged between the two metal conductive strips. Specifically, in an example, the insulating and isolating member 70 is a silicone layer, so The insulating and isolating part 70 is integrally formed with the flexible fixing layer (silica gel layer 6 ); thus, the silica gel layer 6 can half wrap and fix the lower parts of the two metal conductive strips 7 . It can be understood that, in some other examples, the insulating and isolating component 70 may also be an independent component from the flexible fixing layer.

Preferably, in one example, the width and mutual spacing of the at least two parallel metal conductive strips 7 are equal to the width and spacing of the at least two conductive copper pads at the bottom of the FPCB board 4, as can be understood above The description is not limiting, and in practical examples, the widths therein may be adjusted accordingly.

At the same time, it can be understood that at least one unit circuit can be set in each FPCB board 4 , as shown in FIG. 8 , which shows an example in which two unit circuits are set in each FPCB board 4 . It can be understood that, since the unit circuits in each FPCB board are all set independently, when a unit circuit in a certain FPCB board 4 is destroyed, only this unit circuit does not work, and will not affect other FPCB boards 4. The unit circuit is affected.

Specifically, the at least two metal conductive strips 7 may be copper strips, aluminum strips, steel strips or alloy strips of the above materials.

Correspondingly, as shown in FIG. 9 and FIG. 10 , a schematic structural diagram of a second embodiment of the present invention is shown. The biggest difference between this second embodiment and the first embodiment shown in FIGS. 4 to 8 is that the flexible fixing layer is an adhesive tape 8, and the adhesive tape 8 fixes two metal conductive strips 7; An insulating spacer 70 is arranged between the two metal conductive strips, and the insulating spacer 70 is a plastic strip whose bottom surface is fixed to the adhesive tape 8; other structures and principles are the same as those shown in Fig. 4 to Fig. 8 shows the same as in the first embodiment, and will not be described in detail here.

Further, as shown in FIG. 11 , it shows a schematic diagram of the cooperative relationship between the metal conductive strip and the flexible fixing layer in the third embodiment of a flexible LED light strip provided by the present invention; in this embodiment, each The metal conductive strip 7 can be a braided metal strip, that is, a plurality of small metal strips or metal wires are braided, and the upper surface of the braided metal strip is at least partially exposed, and is respectively attached to a conductive copper pad at the bottom of the FPCB board, thereby An electrical connection is made to the conductive copper pad. Other structures and principles in this embodiment are the same as those in the first embodiment shown in FIG. 4 to FIG. 8 , and will not be described in detail here.

Further, as shown in FIG. 12 , it shows a schematic diagram of the cooperative relationship between the metal conductive strip and the flexible fixing layer in the fourth embodiment of a flexible LED light strip provided by the present invention; in this embodiment, each The metal conductive strip 7 can be formed by a single strand or multiple strands of metal wire, for example, a thicker metal wire can be used; or a plurality of smaller metal wires can be arranged side by side; it can be understood that the surface of the metal wire At least partially exposed, and respectively clinging to a conductive copper pad at the bottom of the FPCB board, so as to realize electrical connection with the conductive copper pad. Other structures and principles in this embodiment are the same as those in the first embodiment shown in FIG. 4 to FIG. 8 , and will not be described in detail here. It can be understood that, in some other embodiments, the metal conductive strip may also have other deformations.

Implementing the embodiment of the present invention has the following beneficial effects:

First of all, the present invention can improve the mechanical strength of the flexible LED light strip by providing at least two metal conductive strips under the FPCB board of the flexible LED light strip to flexibly fix the layer;

At the same time, since the upper surfaces of at least two metal conductive strips are in close contact with the conductive copper under the FPCB board, it is equivalent to increasing the effective current-carrying area, so that the voltage drop of the line can be smaller in the case of single-ended power supply , so that the length of continuous use of the flexible LED light strip is longer;

In addition, because the present invention uses at least two FPCB boards arranged in sequence and arranged at intervals, since a certain interval is set between adjacent FPCB boards, the bending resistance of the light bar can be improved, and the FPCB can be protected to the greatest extent when it is bent. Components on the board are not damaged. In addition, since each section of the FPCB board is independent, even if one section of the FPCB board is damaged (for example, the light strip is wrongly bent or twisted to cause the flexible circuit board to break), it will not affect the normal operation of the other sections of the FPCB board .

The above description is only the specific implementation of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, some improvements and modifications can also be made. It should be regarded as the protection scope of this application.

Claims (10)

1. a kind of flexible LED rope light, which is characterized in that it includes：

At least two FPCB plates are disposed at least two conductive main lines, at least one paster LED, electronics member on every FPCB plates Part, wherein at least two conductive main lines are at least two conductive coppers pools for being laid in FPCB board bottoms portion, it is described at least Two FPCB plates are intervally arranged successively, and there are preset distances between adjacent FPCB plates；

Insulating bag covering layer is wrapped on at least two FPCB plates；

At least two parallel and phases are further provided between at least two FPCB board bottoms portion and the insulating bag covering layer The metal conductive strips being mutually spaced, metal conductive strips described in each are electrically connected with a conductive copper in FPCB board bottoms portion pool, At least two metal conductive strips lower parts are provided with a flexible fixed bed.

2. a kind of flexible LED rope light as described in claim 1, which is characterized in that at least two parallel metallic conductions There are gaps between item, and each metal conductive strips upper surface is at least partly exposed, and are close to every FPCB board bottoms portion respectively One conductive copper pool is electrically connected with a conductive main line on every FPCB plates respectively.

3. a kind of flexible LED rope light as claimed in claim 2, which is characterized in that two of every FPCB board bottoms portion lead Electrolytic copper pool is mutually welded by a solder joint and two metal conductive strips respectively, two conductions in every FPCB board bottoms portion The line between solder joint on copper pool is vertical with two metal conductive strips length directions.

4. a kind of flexible LED rope light as claimed in claim 3, which is characterized in that be disposed at least one on every FPCB plates A complete circuit unit.

5. a kind of flexible LED rope light as claimed in claim 4, which is characterized in that at least two metal conductive strips are copper The alloy strip of band, aluminium strip, steel band or above-mentioned material, the insulating bag covering layer are soft plastic layer or layer of silica gel.

6. a kind of flexible LED rope light as claimed in claim 4, which is characterized in that each metal conductive strips are braiding gold Belong to band, or is formed by sub-thread or multiply metal wire.

7. such as a kind of flexible LED rope light of claim 1 to 6 any one of them, which is characterized in that it is viscose glue to state flexible fixed bed Band or layer of silica gel.

8. as right wants a kind of flexible LED rope light of 1 to 6 any one of them, which is characterized in that in two metal conductive strips Between be provided with and be dielectrically separated from component.

9. a kind of flexible LED rope light as claimed in claim 8, which is characterized in that the flexibility fixed bed is adhesive tape or silicon Glue-line, the component that is dielectrically separated from is a plastic strip.

10. a kind of flexible LED rope light as claimed in claim 8, which is characterized in that the flexibility fixed bed is layer of silica gel, institute It is layer of silica gel to state and be dielectrically separated from component, and the component that is dielectrically separated from is made of one piece with the flexible fixed bed.