Flexible circuit board and LED light strip thereof

Abstract

The utility model discloses a kind of flexible circuit board and LED lamp strip, including by upper to lower sequentially arranged upper insulating layer, circuit layer, power supply layer and lower insulating layer;Power supply layer is provided with first conductive strip and second conductive strip mutually parallel along the length direction of lower insulating layer;First conductive block between first conductive strip and second conductive strip is equipped on circuit layer, second conductive block for connecting power supply layer;Upper insulating layer includes several first and last connected subunits, first window adapted with first conductive block and second window adapted with second conductive block are equipped on subunit.Upper insulating layer, circuit layer and power supply layer are set, first conductive block, second conductive block and power supply layer can be sequentially connected by first window and second window, both ensure circuit stability, also ensure the connection stability between upper insulating layer, circuit layer, power supply layer, avoid gap between upper insulating layer and power supply layer, improve the structural integrity and service life of flexible circuit board.

Description

Technical Field

[0001] This utility model relates to the field of flexible circuit board technology, and in particular to a flexible circuit board and its LED light strip. Background Technology

[0002] Flexible printed circuit boards (FPCBs) are highly reliable and extremely flexible printed circuit boards. Due to their lightweight, thinness, and flexible installation, they are widely used in the lighting industry. However, existing four-layer FPCBs, in order to simplify the production process and save assembly costs, fix the conductive lines to the top of the board. This creates gaps between the surface of the flexible circuit board and the conductive lines, allowing dust and other debris to enter the flexible circuit board. It also limits the width of the conductive lines, affecting the load-bearing capacity and lifespan of the LED strip. Utility Model Content

[0003] To address the aforementioned problems, the purpose of this utility model is to provide a flexible circuit board and its LED light strip, which simplifies the structure of the flexible circuit board, reduces its production cost, and improves its production efficiency.

[0004] The technical solution adopted by this utility model to solve its problem is:

[0005] In a first aspect, embodiments of this application provide a flexible circuit board, comprising an upper insulating layer, a circuit layer, a power layer, and a lower insulating layer arranged sequentially from top to bottom; the power layer is provided with a first conductive strip and a second conductive strip parallel to each other along the length direction of the lower insulating layer; the circuit layer is provided with a first conductive block located between the first conductive strip and the second conductive strip, and a second conductive block for connecting the power layer; the upper insulating layer includes a plurality of sub-units connected end to end, each sub-unit being provided with a first window adapted to the first conductive block and a second window adapted to the second conductive block; the second window is located at both ends of the sub-unit, and two sets of first windows are distributed parallel to each other between the second windows, with adjacent first windows facing different first conductive blocks respectively.

[0006] The aforementioned flexible circuit board has at least the following beneficial effects: by setting an upper insulating layer, a circuit layer, and a power layer, the first conductive block, the second conductive block, and the power layer can be connected sequentially through the first and second openings, ensuring both circuit stability and the connection stability between the upper insulating layer, the circuit layer, and the power layer, avoiding gaps between the upper insulating layer and the power layer, and improving the structural integrity and service life of the flexible circuit board; by setting sub-units, the first conductive block, and the second conductive strip, the connection stability between the circuit layer and the power layer is ensured, avoiding poor contact during use of the flexible circuit board, and improving the operational stability of the flexible circuit board.

[0007] In some embodiments, the subunit is further provided with a third window adapted to the second conductive block, and the second conductive block is electrically connected to the first conductive block through the third window and the first window. By providing the third window, it is convenient for the second conductive block to be electrically connected to the first conductive block through the third window and the first window, thereby improving the ease of use of the flexible circuit board.

[0008] In some embodiments, the first window, the second window, and the third window are all oblong. This structure ensures that electronic devices can be stably soldered onto the circuit layer through the first and third windows, and also facilitates the connection of an external power supply to the first and second conductive strips through the second window, thereby improving the stability and lifespan of the flexible circuit board.

[0009] In some embodiments, the second conductive block near the first conductive strip extends to the outside of the first conductive strip; the second conductive block near the second conductive strip extends to the outside of the second conductive strip. This structure increases the contact area between the second conductive block and the power layer, ensuring that the second conductive block can stably connect to the first or second conductive strip, preventing the second conductive block from detaching from the power layer during use, and improving the connection stability of the flexible circuit board.

[0010] In some embodiments, the width of the second conductive block is greater than the width of the first conductive block. This structure increases the welding area between the external power supply and the second conductive block through the second opening, thereby improving the connection stability of the flexible circuit board.

[0011] In some embodiments, the subunit is provided with at least two sets of the first windows. This structure ensures that at least two electronic devices are connected to the third conductive block through adjacent first windows, and that at least one current-limiting resistor is provided in the subunit, thus ensuring the operational stability of other electronic devices.

[0012] In some embodiments, the upper insulating layer, the circuit layer, the power layer, and the lower insulating layer are bonded together using thermosetting adhesives. Thermosetting adhesives have the advantages of low cost and strong adhesion, and the bonding with thermosetting adhesives ensures the connection stability of each layer of the flexible circuit board.

[0013] In some embodiments, the circuit layer and the power layer are any one of copper foil, aluminum foil, aluminum-copper-plated foil, iron foil, and iron-copper-plated foil. Using copper foil, aluminum foil, aluminum-copper-plated foil, iron foil, and iron-copper-plated foil for the circuit layer and power layer ensures that different conductive materials can be selected for the circuit layer and power layer according to the application scenario and requirements, thus reducing the manufacturing cost of the flexible circuit board.

[0014] Secondly, this application provides an LED light strip, characterized in that it includes electronic devices and the aforementioned flexible circuit board; the pins of the electronic devices pass through the first adjacent openings and are electrically connected to the first conductive block, or the pins of the electronic devices pass through the first openings to conduct electricity between the first conductive block and the second conductive block.

[0015] The beneficial effects of the aforementioned LED light strip are as follows: By setting an upper insulating layer, a circuit layer, and a power layer, the first conductive block, the second conductive block, and the power layer can be connected sequentially through the first and second openings. This ensures both circuit stability and the connection stability between the upper insulating layer, the circuit layer, and the power layer, avoiding gaps between the upper insulating layer and the power layer, and improving the structural integrity and lifespan of the LED light strip. By setting sub-units, the first conductive block, and the second conductive strip, the connection stability between the circuit layer and the power layer is ensured, avoiding poor contact during use of the flexible circuit board and improving the working stability of the LED light strip. By setting a third opening, the second conductive block can be electrically connected to the first conductive block through the third opening and the first opening, improving the ease of use of the LED light strip.

[0016] In some embodiments, the electronic device includes LED chips and a current-limiting resistor. By setting the LED chips and the current-limiting resistor, which are connected to the power supply layer through a first conductive block and a second conductive block, the current-limiting resistor can effectively limit the current passing through the LED chips within a safe range, ensuring the working stability and safety of the LED light strip.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The above and additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a partial perspective view of a flexible circuit board according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 Planar structural diagram of the upper and middle insulating layers;

[0021] Figure 3 for Figure 1 Planar structure diagram of the middle circuit layer;

[0022] Figure 4 for Figure 1 Planar structure diagram of the middle power layer;

[0023] Figure 5 for Figure 1 Planar structure diagram of the middle and lower insulating layers. Detailed Implementation

[0024] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0026] Reference Figures 1 to 5 This utility model embodiment provides a flexible circuit board, including an upper insulating layer 100, a circuit layer 200, a power layer 300, and a lower insulating layer 400 arranged sequentially from top to bottom; the power layer 300 has a first conductive strip 310 and a second conductive strip 320 arranged parallel to each other along the length direction of the lower insulating layer 400; the circuit layer 200 has a first conductive block 210 located between the first conductive strip 310 and the second conductive strip 320, and a second conductive block 220 for connecting the power layer 300; the upper insulating layer 100 includes a plurality of sub-units 110 connected end to end, and the sub-units 110 have a first window 111 adapted to the first conductive block 210 and a second window 112 adapted to the second conductive block 220; the second window 112 is located at both ends of the sub-units 110, and two sets of first windows 111 are distributed parallel to each other between the second windows 112, with adjacent first windows 111 facing different first conductive blocks 210 respectively.

[0027] By setting up an upper insulating layer 100, a circuit layer 200, and a power layer 300, the first conductive block 210, the second conductive block 220, and the power layer 300 can be connected sequentially through the first window 111 and the second window 112. This ensures both circuit stability and the connection stability between the upper insulating layer 100, the circuit layer 200, and the power layer 300, avoiding gaps between the upper insulating layer 100 and the power layer 300, and improving the structural integrity and service life of the flexible circuit board. By setting up the sub-unit 110, the first conductive block 210, and the second conductive strip 320, the connection stability between the circuit layer 200 and the power layer 300 is ensured, preventing poor contact during use of the flexible circuit board and improving its operational stability.

[0028] In another embodiment, the subunit 110 is further provided with a third window 113 adapted to the second conductive block 220. The second conductive block 220 is electrically connected to the first conductive block 210 through the third window 113 and the first window 111. By providing the third window 113, it is convenient for the second conductive block 220 to be electrically connected to the first conductive block 210 through the third window 113 and the first window 111, thereby improving the ease of use of the flexible circuit board.

[0029] In another embodiment, the first window 111, the second window 112, and the third window 113 are all oblong. This structure ensures that electronic devices can be stably soldered onto the circuit layer 200 through the first window 111 and the third window 113, and also facilitates the connection of an external power supply to the first conductive strip 310 and the second conductive strip 320 through the second window 112, thereby improving the stability and service life of the flexible circuit board.

[0030] In another embodiment, the second conductive block 220 near the first conductive strip 310 extends to the outside of the first conductive strip 310; the second conductive block 220 near the second conductive strip 320 extends to the outside of the second conductive strip 320. This structure increases the contact area between the second conductive block 220 and the power layer 300, ensuring that the second conductive block 220 can stably connect to the first conductive strip 310 or the second conductive strip 320, preventing the second conductive block 220 from detaching from the power layer 300 during use, and improving the connection stability of the flexible circuit board.

[0031] In another embodiment, the width of the second conductive block 220 is greater than the width of the first conductive block 210. This structure increases the welding area between the external power supply and the second conductive block 220 through the second opening 112, thereby improving the connection stability of the flexible circuit board.

[0032] In another embodiment, the upper insulating layer 100, circuit layer 200, power layer 300, and lower insulating layer 400 are bonded together using thermosetting adhesive. Thermosetting adhesive has the advantages of low cost and strong adhesion, and the bonding of each layer of the flexible circuit board is ensured by using thermosetting adhesive.

[0033] In another embodiment, the circuit layer 200 and the power layer 300 are any one of copper foil, aluminum foil, aluminum-copper-plated foil, iron foil, or iron-copper-plated foil. Using any one of these materials ensures that the circuit layer 200 and power layer 300 can be made of different conductive materials depending on the application scenario and requirements, thus reducing the manufacturing cost of the flexible circuit board.

[0034] This application embodiment also provides an LED light strip, including electronic devices and a flexible circuit board as described above; the pins of the electronic devices pass through adjacent first openings 111 and are electrically connected to the first conductive block 210, or the pins of the electronic devices pass through the first openings 111 to conduct the first conductive block 210 and the second conductive block 220.

[0035] In another embodiment, the electronic components include LED chips and a current-limiting resistor. By configuring the LED chips and the current-limiting resistor, which are connected to the power layer 300 via a first conductive block 210 and a second conductive block 220, the current-limiting resistor effectively limits the current passing through the LED chips within a safe range, ensuring the stability and safety of the LED light strip's operation.

[0036] The working principle of this utility model will be further explained below.

[0037] In the production process of flexible printed circuit boards (FPCBs), firstly, according to the size and power requirements of the product, appropriately sized circuit layers 200 and power layers 300 are cut from copper material coated with a waste removal film. For example, the width of the first conductive strip 310 and the second conductive strip 320 is 1.4 mm. A set of second conductive blocks 220 is provided at both ends of a corresponding area of ​​a sub-unit 110 in the circuit layer 200, and multiple sets of first conductive blocks 210 are provided between the two sets of second conductive blocks 220. An upper insulating layer 100 is cut from the insulating material, and four second windows 112, two third windows 113, and twelve first windows 111 are correspondingly provided within the sub-unit 110 to ensure that seven electronic devices can be installed within the sub-unit 110, and that an external power supply can be connected to the second windows 112 at the same end. A lower insulating layer 400 with the same width as the upper insulating layer 100 is cut from the insulating material. Then, the upper insulating layer 100 and the circuit layer 200 are processed. 0. The power layer 300 and the lower insulating layer 400 are assembled and fixed. First, the power layer 300 is bonded to the lower insulating layer 400 using thermosetting adhesive. Next, the cut circuit layer 200 is degassed, and then a transfer film with adhesive properties is bonded to the upper end of the circuit layer 200. The adhesive properties of the transfer film are greater than those of the degassed film. Then, the degassed film located at the lower end of the circuit layer 200 is separated. Finally, the circuit layer 200 and the transfer film are bonded to the power layer 400. Next, on the lower insulating layer 400 of layer 300, the transfer film located at the upper end of the circuit layer 200 is separated so that the circuit layer 200 is transferred completely, quickly and accurately to the upper end of the power layer 300; finally, the insulating layer 100 is bonded to the upper end of the circuit layer 200 so that the first window 111 is aligned with the first conductive block 210, the second window 112 is aligned with the second conductive block 220, and the third window 113 is aligned with the second conductive block 220, thus obtaining a flexible circuit board.

[0038] During the assembly of the LED light strip, the solder feet of the LED beads are passed through the adjacent first openings 111 and electrically connected to the first conductive block 210. The leads of the current-limiting resistors are passed through the first openings 111 to connect the first conductive block 210 and the second conductive block 220, ensuring that multiple LED beads and corresponding current-limiting resistors are installed in the sub-unit 110. The LED beads and current-limiting resistors are electrically connected to the positive terminal of the external power supply through the first conductive strip 310 and to the negative terminal through the second conductive strip 320, enabling the LED beads and current-limiting resistors to operate stably. Since the power layer 300 is located below the circuit layer 200, the upper insulating layer 100 can adhere more smoothly and stably to the top of the circuit layer 200, effectively reducing the gap between the upper insulating layer 100 and the power layer 300. This prevents dust and other debris from entering the flexible circuit board through the gaps during operation, affecting the electrical connection stability between the circuit layer 200 and the power layer 300, and improving the lifespan of the LED light strip.

[0039] As can be seen from the above description, the flexible circuit board and its LED light strip of this utility model, by setting an upper insulating layer 100, a circuit layer 200, and a power supply layer 300, can sequentially connect the first conductive block 210, the second conductive block 220, and the power supply layer 300 through the first window 111 and the second window 112. This ensures both circuit stability and connection stability between the upper insulating layer 100, the circuit layer 200, and the power supply layer 300, avoiding gaps between the upper insulating layer 100 and the power supply layer 300, and improving the structural integrity and service life of the LED light strip. By setting the sub-unit 110, the first conductive block 210, and the second conductive strip 320, the connection stability between the circuit layer 200 and the power supply layer 300 is ensured, avoiding poor contact during use of the flexible circuit board and improving the working stability of the LED light strip. By setting the third window 113, the second conductive block 220 can be electrically connected to the first conductive block 210 through the third window 113 and the first window 111, improving the ease of use of the LED light strip.

[0040] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A flexible circuit board, characterized in that, It includes, from top to bottom, an upper insulating layer, a circuit layer, a power layer, and a lower insulating layer; The power layer is provided with a first conductive strip and a second conductive strip parallel to each other along the length direction of the lower insulating layer; the circuit layer is provided with a first conductive block located between the first conductive strip and the second conductive strip, and a second conductive block for connecting the power layer; The upper insulating layer includes several sub-units connected end to end. Each sub-unit is provided with a first window adapted to the first conductive block and a second window adapted to the second conductive block. The second window is located at both ends of the sub-unit. Two sets of first windows are distributed parallel to each other between the second windows. The adjacent first windows are respectively facing different first conductive blocks.

2. The flexible circuit board according to claim 1, characterized in that, The subunit is also provided with a third window adapted to the second conductive block, and the second conductive block is electrically connected to the first conductive block through the third window and the first window.

3. A flexible circuit board according to claim 2, characterized in that, The first window, the second window, and the third window are all oblong.

4. A flexible circuit board according to claim 1, characterized in that, The second conductive block near the first conductive strip extends to the outside of the first conductive strip; the second conductive block near the second conductive strip extends to the outside of the second conductive strip.

5. A flexible circuit board according to claim 4, characterized in that, The width of the second conductive block is greater than the width of the first conductive block.

6. A flexible circuit board according to claim 1, characterized in that, The subunit is provided with at least two sets of the first window.

7. A flexible circuit board according to claim 1, characterized in that, The upper insulating layer, the circuit layer, the power layer, and the lower insulating layer are bonded together with thermosetting adhesive.

8. A flexible circuit board according to claim 1, characterized in that, The circuit layer and the power layer are any one of copper foil, aluminum foil, aluminum-plated copper foil, iron foil, and iron-plated copper foil.

9. An LED light strip, characterized in that, Includes electronic devices and a flexible circuit board as described in any one of claims 1 to 8; the pins of the electronic devices pass through the first adjacent openings and are electrically connected to the first conductive block, or the pins of the electronic devices pass through the first openings and conduct electricity between the first conductive block and the second conductive block.

10. An LED light strip according to claim 9, characterized in that, The electronic components include LED beads and current-limiting resistors.

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