CN214507470U - Flexible double-layer circuit board with protection circuit and lamp strip using same - Google Patents
Flexible double-layer circuit board with protection circuit and lamp strip using same Download PDFInfo
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- CN214507470U CN214507470U CN202120601614.0U CN202120601614U CN214507470U CN 214507470 U CN214507470 U CN 214507470U CN 202120601614 U CN202120601614 U CN 202120601614U CN 214507470 U CN214507470 U CN 214507470U
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Abstract
The utility model discloses a flexible double-layer circuit board with a protection circuit and a lamp belt with the same, which comprises a first insulating film layer, a first metal foil layer, a second insulating film layer, a second metal foil layer and a third insulating film layer which are arranged from top to bottom in sequence; the first insulating film layer comprises a plurality of end-to-end subunits, and a row of first windows and a row of second windows are arranged on each subunit; the first metal foil layer is provided with a first protection wire and a second protection wire which penetrate through two ends of the first metal foil layer in the length direction; a plurality of metal guide blocks are arranged between the first protection wire and the second protection wire; the first protection line, the second protection line and the metal guide block form a protection circuit. Through setting up first insulating rete and first metal foil layer, first windowing and second windowing expose the metal and lead the piece and form the pad, make first protection line, second protection line and metal lead the piece and form the protection circuit, improve the stability and the reliability of taking the flexible double-layer circuit board of protection circuit.
Description
Technical Field
The utility model belongs to the technical field of the flexible circuit board technique and specifically relates to a take flexible double-deck circuit board of protection circuit and use its lamp area.
Background
A Flexible Printed Circuit (FPC) is a highly reliable, excellent flexible printed circuit board. The LED lamp strip has the advantages of light weight, thin thickness, free bending and folding and the like, so that the LED lamp strip is widely popularized and applied in the field of LED lamp strips. With the technical development of the LED lamp strip, higher requirements are put forward on the stability and the protectiveness of the flexible circuit board; the conventional flexible circuit board cannot provide a protection circuit as a traditional electroplating circuit board, and the connectivity of the circuit cannot be ensured when part of the flexible circuit board is broken in the use process of the LED lamp strip, so that the stability and the service life of the LED lamp strip are greatly influenced.
SUMMERY OF THE UTILITY MODEL
In order to solve the above problem, an object of the utility model is to provide a take flexible double-layer circuit board of protection circuit and have its lamp area for provide the protection circuit, guarantee the connectivity of lamp area circuit, improve the stability and the life in lamp area.
The utility model provides a technical scheme that its problem adopted is:
the utility model discloses a first aspect, a flexible double-layer circuit board with protection circuit, which comprises a first insulating film layer, a first metal foil layer, a second insulating film layer, a second metal foil layer and a third insulating film layer which are arranged from top to bottom in sequence;
the first insulating film layer comprises a plurality of end-to-end subunits, a row of first windows and a row of second windows are arranged on each subunit, and the positions of the first windows and the second windows are corresponding to each other; at least one end of each subunit is provided with a pair of a third windowing and a fourth windowing;
the first metal foil layer is provided with a first protection wire and a second protection wire which penetrate through two ends of the first metal foil layer in the length direction; a plurality of metal guide blocks are arranged between the first protection wire and the second protection wire; the first protection wire, the second protection wire and the metal guide block form a protection circuit; a first bump is arranged on one side, facing the metal guide block, of the first protection line, and a second bump is arranged on one side, facing the metal guide block, of the second protection line;
the second metal foil layer is provided with a first power line and a second power line which penetrate through two ends of the second metal foil layer in the length direction;
in each subunit, the first lug is opposite to the first windowing position at the foremost end and is provided with a first through hole; the second lug is opposite to the second windowing position at the rearmost end and is provided with a second through hole; the first through hole and the second through hole both penetrate through the first metal foil layer and the second insulating film layer.
The flexible double-layer circuit board with the protection circuit at least has the following beneficial effects: by arranging the first insulating film layer and the first metal foil layer, the first windowing and the second windowing expose the metal guide block and form a bonding pad, so that the first protection line, the second protection line and the metal guide block form a protection circuit, and the stability and reliability of the flexible double-layer circuit board with the protection circuit are improved; through setting up first through-hole and second through-hole, run through first metal foil layer and second insulation film layer, realize that the interconnection of the protection circuit on the first metal foil layer and the power supply circuit on the second metal foil layer switches on, reduces the quantity of punching a hole on first metal foil layer, reduces the manufacturing cost of the flexible double-deck circuit board of taking the protection circuit.
Further, in each subunit, the first fenestration located at the foremost end and the second fenestration located at the rearmost end are both oblong, and the first through hole and the second through hole are both circular. The structure is convenient for welding electronic elements on the first windowing and the second windowing, so that a protection circuit on the first metal foil layer and a power circuit on the second metal foil layer are conducted, and the structural stability of the flexible double-layer circuit board with the protection circuit is guaranteed.
Further, the width of the first through hole is smaller than that of the first windowing; the width of the second through hole is smaller than that of the second windowing. When the structure ensures that the electronic element is welded, the solder paste can pass through the first through hole and the second through hole to communicate the first metal foil layer and the second metal foil layer, so that the use convenience of the flexible double-layer circuit board with the protection circuit is improved.
Furthermore, the third opening window is opposite to the first bump; the fourth window is opposite to the second bump. The structure ensures that the protection circuit on the first metal foil layer and the external power supply can be conducted when the external power supply is connected to the third windowing and the fourth windowing, and the welding operation of the flexible double-layer circuit board with the protection circuit is simplified.
Further, the first, second, and third insulating film layers are all made of PI films. The PI film has the advantages of strong high temperature resistance, high structural strength and good insulation effect, and the first insulation film layer, the second insulation film layer and the third insulation film layer are all made of the PI film, so that the flexibility resistance of the reinforced circuit board is further ensured, and a good protection effect is achieved on a protection circuit and a power supply circuit.
Further, the first metal foil layer and the second metal foil layer are any one of a copper foil, an aluminum-plated copper foil, an iron foil, and an iron-plated copper foil. The first metal foil layer and the second metal foil layer can select conductive materials of different materials according to use scenes and requirements, and the application range of the flexible double-layer circuit board with the protection circuit is expanded.
Further, the first insulating film layer, the first metal foil layer, the second insulating film layer, the second metal foil layer and the third insulating film layer are bonded together by thermosetting glue. The structure improves the structural strength of the flexible double-layer circuit board with the protection circuit and effectively controls the thickness of the flexible double-layer circuit board.
In a second aspect of the present invention, a light strip includes an LED lamp body and the above-mentioned flexible double-layer circuit board with a protection circuit; and the welding legs of the LED lamp body are respectively fixed in the first windowing and the corresponding second windowing.
Further, the first protection wire is welded in the first through hole through the LED lamp body in an SMT mode and is electrically connected with the first power line; the second protection line is welded in the second through hole through the LED lamp body in an SMT mode and is electrically connected with the second power line. Through welding the LED lamp body, switch on first protection line and first power cord, second protection line and second power cord, realize that the interconnection of protection circuit and power supply line switches on, both guaranteed the stability of being connected of LED lamp body and flexible double-deck circuit board, avoided taking place the condition of LED lamp body contact failure, also improved the packaging efficiency in lamp area.
Furthermore, the surface of the flexible double-layer circuit board with the protection circuit is also provided with a current-limiting resistor, and welding feet of the current-limiting resistor are respectively fixed in the first windowing and the corresponding second windowing. Through setting up current-limiting resistor, avoid parts such as too high electric current damage LED lamp body, improve the security in lamp area.
The beneficial effect in above-mentioned lamp area is: by arranging the first insulating film layer and the first metal foil layer, the first windowing and the second windowing expose the metal guide block and form a bonding pad, so that the first protection wire, the second protection wire and the metal guide block form a protection circuit, and the safety and the reliability of the lamp strip are improved; through arranging the first through hole and the second through hole and penetrating through the first metal foil layer and the second insulating film layer, the interconnection and conduction of a protection circuit on the first metal foil layer and a power supply circuit on the second metal foil layer are realized, the number of punched holes on the first metal foil layer is reduced, and the production cost of the lamp strip is reduced; through welding the LED lamp body, switch on first protection line and first power cord, second protection line and second power cord, realize that the interconnection of protection circuit and power supply line switches on, both guaranteed the stability of being connected of LED lamp body and flexible double-deck circuit board, avoided taking place the condition of LED lamp body contact failure, also improved the packaging efficiency in lamp area.
Additional aspects and advantages of the 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.
Drawings
The above and additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a partial perspective view of a flexible double-layer circuit board with a protection circuit according to an embodiment of the present invention;
fig. 2 is a plan view of a first insulating film layer of a flexible double-layer circuit board with a protection circuit according to an embodiment of the present invention;
fig. 3 is a plan view of a first metal foil layer of a flexible double-layer circuit board with a protection circuit according to an embodiment of the present invention;
fig. 4 is a plan view of a second insulating film layer of a flexible double-layer circuit board with a protection circuit according to an embodiment of the present invention;
fig. 5 is a plan view of a second metal foil layer of a flexible double-layer circuit board with a protection circuit according to an embodiment of the present invention;
fig. 6 is a plan view of a third insulating film layer of a flexible double-layer circuit board with a protection circuit according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the directions such as up, down, front, back, left, right, etc. are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or electronic component indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
In the description of the present invention, a plurality of means are one or more, a plurality of means are two or more, and the terms greater than, less than, exceeding, etc. are understood as not including the number, and the terms greater than, less than, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
Referring to fig. 1 to 6, an embodiment of the present invention provides a flexible double-layer circuit board with a protection circuit, which includes a first insulating film layer 100, a first metal foil layer 200, a second insulating film layer 300, a second metal foil layer 400, and a third insulating film layer 500, which are sequentially disposed from top to bottom;
the first insulating film layer 100 comprises a plurality of end-to-end subunits 110, wherein a row of first windows 111 and a row of second windows 112 are arranged on each subunit 110, and the positions of the first windows 111 and the second windows 112 correspond to each other; at least one end of each subunit 110 is provided with a pair of third windows 113 and fourth windows 114;
the first metal foil layer 200 is provided with a first protection line 210 and a second protection line 220 which penetrate through both ends of the first metal foil layer 200 in the length direction; a plurality of metal guide blocks 230 are arranged between the first protection wire 210 and the second protection wire 220; the first protection line 210, the second protection line 220 and the metal guide block 230 form a protection line; a first bump 240 is disposed on one side of the first protection line 210 facing the metal guide block 230, and a second bump 250 is disposed on one side of the second protection line 220 facing the metal guide block 230;
the second metal foil layer 400 is provided with a first power line 410 and a second power line 420 which penetrate through both ends of the second metal foil layer 400 in the length direction;
in each subunit 110, the first bump 240 is opposite to the first window 111 at the foremost end and is provided with a first through hole 260; the second bump 250 is opposite to the position of the second window 112 at the rearmost end and is provided with a second through hole 270; the first and second through holes 260 and 270 each penetrate the first metal foil layer 200 and the second insulating film layer 300.
By arranging the first insulating film layer 100 and the first metal foil layer 200, the first window 111 and the second window 112 expose the metal guide block 230 and form a bonding pad, so that the first protection line 210, the second protection line 220 and the metal guide block 230 form a protection circuit, and the safety and reliability of the flexible double-layer circuit board with the protection circuit are improved; through setting up first through-hole 260 and second through-hole 270, run through first metal foil layer 200 and second insulating rete 300, realize that the protection circuit on the first metal foil layer 200 and the interconnection of the power supply circuit on the second metal foil layer 400 switch on, reduce the quantity of punching a hole at first metal foil layer 200, reduce the manufacturing cost of the flexible double-layer circuit board of taking the protection circuit.
Referring to fig. 1 to 3, in another embodiment, in each sub-unit 110, the first fenestration 111 located at the frontmost end and the second fenestration 112 located at the rearmost end are both oblong, and the first through-hole 260 and the second through-hole 270 are both circular. The structure facilitates welding of electronic components on the first window 111 and the second window 112, and further conducts the protection circuit on the first metal foil layer 200 and the power supply circuit on the second metal foil layer 400, thereby ensuring the structural stability of the flexible double-layer circuit board with the protection circuit.
In another embodiment, the width of the first via 260 is smaller than the width of the first window 111; the width of the second through hole 270 is smaller than the width of the second window 112. By the structure, when the electronic element is welded, solder paste can pass through the first through hole 260 and the second through hole 270 to communicate the first metal foil layer 200 with the second metal foil layer 400, and the use convenience of the flexible double-layer circuit board with the protection circuit is improved.
In another embodiment, the third opening window 113 is opposite to the first bump 240; the fourth opening 114 is opposite to the second bump 250. The structure ensures that the protection circuit on the first metal foil layer 200 and the external power supply can be conducted when the external power supply is connected to the third opening window 113 and the fourth opening window 114, and the welding operation of the flexible double-layer circuit board with the protection circuit is simplified.
In this embodiment, the third opening window 113 and the fourth opening window 114 can be used as the bonding position of the positive and negative output solder feet of the power line according to the connection direction of the electronic component, and the positive and negative output directions are not limited herein, thereby improving the practicability of the flexible double-layer circuit board with the protection circuit. In addition, the flexible double-layer circuit board with the protection circuit comprises a plurality of end-to-end sub-units 110, and a third opening window 113 and a fourth opening window 114 are arranged at the front end and/or the rear end of each sub-unit 110. The user can cut the circuit board on the third opening window 113 and the fourth opening window 114 along the length direction perpendicular to the sub-unit 110 according to the actual application requirement. When the power supply is installed and used, positive and negative output welding pins of the power supply line are connected to the positions of the corresponding third opening window 113 and the fourth opening window 114.
In this embodiment, the flexible double-layer circuit board with the protection circuit realizes the interconnection and conduction between the power supply circuit on the second metal foil layer 400 and the protection circuit on the first metal foil layer 200, and the interconnection and conduction between the electronic component and the protection circuit on the first metal foil layer 200 through the first through hole 260 and the second through hole 270 penetrating through the first metal foil layer 200 and the second insulating film layer 300.
In the present embodiment, the plurality of metal guide blocks 230 have two shapes of a quadrilateral shape and a Z shape, and each quadrilateral metal guide block 230 and each Z-shaped metal guide block 230 form a protection circuit with the electronic component, the first protection line 210 and the second protection line 220.
In another embodiment, the first insulating film layer 100, the second insulating film layer 300, and the third insulating film layer 500 are all made of PI films. The PI film has the advantages of strong high temperature resistance, high structural strength and good insulation effect, and the first insulation film layer 100, the second insulation film layer 300 and the third insulation film layer 500 are all made of the PI film, so that the flexibility resistance of the reinforced circuit board is further ensured, and a good protection effect is achieved on a protection circuit and a power supply circuit.
In another embodiment, the first metal foil layer and the second metal foil layer are any one of a copper foil, an aluminum-plated copper foil, an iron foil, and an iron-plated copper foil. The first metal foil layer and the second metal foil layer can select conductive materials of different materials according to use scenes and requirements, and the application range of the flexible double-layer circuit board with the protection circuit is expanded.
In another embodiment, the first insulation film layer 100, the first metal foil layer 200, the second insulation film layer 300, the second metal foil layer 400, and the third insulation film layer 500 are bonded together by thermosetting glue, respectively. The structure improves the structural strength of the flexible double-layer circuit board with the protection circuit and effectively controls the thickness of the flexible double-layer circuit board. In this embodiment, the thermosetting adhesive can be selected from epoxy thermosetting adhesive, oil acrylic thermosetting adhesive, water acrylic thermosetting adhesive, and the like, and is not limited herein.
The following further explains the production process of the flexible double-layer circuit board with the protection circuit.
In the production process, firstly, according to the size and power requirements of a product, a first insulating film layer 100, a first metal foil layer 200, a second insulating film layer 300, a second metal foil layer 400 and a third insulating film layer 500 which are proper in size are cut; then, the first metal foil layer 200 and the second insulating film layer 300 are bonded by the thermosetting adhesive; then, cutting the first metal foil layer 200 by using a die cutting process to remove excess metal foil, thereby forming a first protection line 210, a second protection line 220 and a plurality of metal guide blocks 230, which constitute a protection circuit on the first metal foil layer 200; punching holes on the first metal foil layer 200 and the second insulating film layer 300 using a die cutting process to form a first through hole 260 and a second through hole 270; punching holes on the first insulating film layer 100 by using a die cutting process to form a first window 111, a second window 112, a third window 113 and a fourth window 114; aligning and attaching the first insulating film layer 100 with the first metal foil layer 200 and the second insulating film layer 300, so that the first windows 111 and the second windows 112 are opposite to the corresponding metal guide blocks 230, the third windows 113 are opposite to the first bumps 240, and the fourth windows 114 are opposite to the second bumps 250; pre-attaching the second metal foil layer 400 and the third insulating film layer 500, and cutting off excess metal foil on the second metal foil layer 400 by using a die cutting process to form a first power line 410 and a second power line 420; and aligning and attaching the second metal foil layer 400 and the third insulating film layer 500 to the first insulating film layer 100, the first metal foil layer 200 and the second insulating film layer 300 to obtain the flexible double-layer circuit board with the protection circuit. It can be seen that by arranging the first through hole 260 and the second through hole 270, the number of holes punched at the positions corresponding to the third opening window 113 and the fourth opening window 114 is reduced, the production flow of the flexible double-layer circuit board is simplified, and the production cost is saved.
The embodiment of the utility model also provides a lamp belt, which comprises an LED lamp body and the flexible double-layer circuit board with the protection circuit; the solder legs of the LED lamp body are fixed in the first window 111 and the corresponding second window 112, respectively.
In another embodiment, the first protection wire 210 is electrically connected to the first power line 410 in the first through hole 260 by SMT welding of the LED lamp body; the second protection wire 220 is electrically connected to the second power line 420 in the second through hole 270 by SMT soldering of the LED lamp body. Through welding the LED lamp body, switch on first protection line 210 and first power cord 410, second protection line 220 and second power cord 420, realize that the interconnection of protection circuit and power supply line switches on, both guaranteed the stability of being connected of LED lamp body and flexible double-deck circuit board, avoided taking place the condition of LED lamp body contact failure, also improved the packaging efficiency in lamp area.
In another embodiment, the surface of the flexible double-layer circuit board with the protection circuit is further provided with a current-limiting resistor, and the solder legs of the current-limiting resistor are respectively fixed in the first window 111 and the corresponding second window 112. Through setting up current-limiting resistor, avoid parts such as too high electric current damage LED lamp body, improve the security in lamp area.
As can be seen from the above description, the flexible double-layer circuit board with a protection circuit and the lamp strip having the same according to the present invention improve the safety and reliability of the lamp strip by providing the first insulating film layer 100 and the first metal foil layer 200, and exposing the metal guide 230 through the first window 111 and the second window 112 to form a pad, so that the first protection line 210, the second protection line 220, and the metal guide 230 form a protection circuit; through the arrangement of the first through hole 260 and the second through hole 270, the first metal foil layer 200 and the second insulating film layer 300 are penetrated, so that the interconnection and conduction of a protection circuit on the first metal foil layer 200 and a power supply circuit on the second metal foil layer 400 are realized, the number of punched holes on the first metal foil layer 200 is reduced, and the production cost of the lamp strip is reduced; through welding the LED lamp body, switch on first protection line 210 and first power cord 410, second protection line 220 and second power cord 420, realize that the interconnection of protection circuit and power supply line switches on, both guaranteed the stability of being connected of LED lamp body and flexible double-deck circuit board, avoided taking place the condition of LED lamp body contact failure, also improved the packaging efficiency in lamp area.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge range of those skilled in the art.
Claims (10)
1. The utility model provides a take flexible double-deck circuit board of protection circuit which characterized in that: the insulation film comprises a first insulation film layer, a first metal foil layer, a second insulation film layer, a second metal foil layer and a third insulation film layer which are sequentially arranged from top to bottom;
the first insulating film layer comprises a plurality of end-to-end subunits, a row of first windows and a row of second windows are arranged on each subunit, and the positions of the first windows and the second windows are corresponding to each other; at least one end of each subunit is provided with a pair of a third windowing and a fourth windowing;
the first metal foil layer is provided with a first protection wire and a second protection wire which penetrate through two ends of the first metal foil layer in the length direction; a plurality of metal guide blocks are arranged between the first protection wire and the second protection wire; the first protection wire, the second protection wire and the metal guide block form a protection circuit; a first bump is arranged on one side, facing the metal guide block, of the first protection line, and a second bump is arranged on one side, facing the metal guide block, of the second protection line;
the second metal foil layer is provided with a first power line and a second power line which penetrate through two ends of the second metal foil layer in the length direction;
in each subunit, the first lug is opposite to the first windowing position at the foremost end and is provided with a first through hole; the second lug is opposite to the second windowing position at the rearmost end and is provided with a second through hole; the first through hole and the second through hole both penetrate through the first metal foil layer and the second insulating film layer.
2. The flexible double-layer circuit board with the protection circuit according to claim 1, wherein in each subunit, the first window at the frontmost end and the second window at the rearmost end are both oblong, and the first through hole and the second through hole are both circular.
3. The flexible double-layer circuit board with the protection circuit according to claim 2, wherein the width of the first through hole is smaller than the width of the first window; the width of the second through hole is smaller than that of the second windowing.
4. The flexible double-layer circuit board with the protection circuit according to claim 3, wherein the third opening window is opposite to the first bump; the fourth window is opposite to the second bump.
5. The flexible double-layer circuit board with the protection circuit according to claim 1, wherein the first insulating film layer, the second insulating film layer and the third insulating film layer are all made of PI films.
6. The flexible double-layer circuit board with the protection circuit according to claim 1, wherein the first metal foil layer and the second metal foil layer are any one of copper foil, aluminum-plated copper foil, iron foil, and iron-plated copper foil.
7. The flexible double-layer circuit board with the protection circuit according to claim 1, wherein the first insulation film layer, the first metal foil layer, the second insulation film layer, the second metal foil layer and the third insulation film layer are bonded together by thermosetting adhesive.
8. A light strip comprising an LED lamp body and the flexible double-layer wiring board with a protective circuit according to any one of claims 1 to 7; and the welding legs of the LED lamp body are respectively fixed in the first windowing and the corresponding second windowing.
9. A light strip as claimed in claim 8, wherein the first protection wire is electrically connected to the first power line through the LED lamp body being SMT welded in the first through hole; the second protection line is welded in the second through hole through the LED lamp body in an SMT mode and is electrically connected with the second power line.
10. A light strip according to claim 8, wherein a current limiting resistor is further disposed on a surface of the flexible double-layer circuit board with the protection circuit, and solder tails of the current limiting resistor are respectively fixed in the first window and the corresponding second window.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120601614.0U CN214507470U (en) | 2021-03-24 | 2021-03-24 | Flexible double-layer circuit board with protection circuit and lamp strip using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120601614.0U CN214507470U (en) | 2021-03-24 | 2021-03-24 | Flexible double-layer circuit board with protection circuit and lamp strip using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214507470U true CN214507470U (en) | 2021-10-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120601614.0U Active CN214507470U (en) | 2021-03-24 | 2021-03-24 | Flexible double-layer circuit board with protection circuit and lamp strip using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214507470U (en) |
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2021
- 2021-03-24 CN CN202120601614.0U patent/CN214507470U/en active Active
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