CN210840190U

CN210840190U - Flexible printed circuit board and LED lamp strip

Info

Publication number: CN210840190U
Application number: CN201921666440.5U
Authority: CN
Inventors: 张素贞
Original assignee: Zhongshan Gujing Photoelectric Co ltd
Current assignee: Zhongshan Gujing Photoelectric Co ltd
Priority date: 2019-10-01
Filing date: 2019-10-01
Publication date: 2020-06-23
Anticipated expiration: 2029-10-01

Abstract

The utility model provides a flexible printed circuit board and LED lamp area. The flexible printed circuit board comprises a flexible base layer and a circuit layer covering the flexible base layer, and the flexible printed circuit board comprises: a circuit area, wherein a circuit layer in the circuit area is provided with a conductive circuit; and an edge region which is an edge portion of the flexible printed wiring board and surrounds the circuit region; and a protective line is formed in the circuit layer of the marginal area, extends along the marginal line of the marginal area and is insulated from the conductive circuit in the circuit area. The utility model also provides an use printed circuit board's LED lamp area.

Description

Flexible printed circuit board and LED lamp strip

Technical Field

The utility model relates to a flexible printed circuit board technical field specifically relates to a flexible printed circuit board and LED lamp area.

Background

Flexible printed wiring boards, also known as "flexible boards," are printed circuits made from flexible, insulating substrates. Flexible circuits provide excellent electrical performance, meet design requirements for smaller and higher density packaging, and also help reduce assembly processes and enhance reliability. The flexible printed wiring board is the only solution to meet the miniaturization and mobility requirements of electronic products. The flexible printed circuit board can be freely bent, wound and folded, can bear millions of dynamic bending without damaging the lead, can be randomly arranged according to the space layout requirement, and can be freely moved and stretched in a three-dimensional space, so that the integration of component assembly and lead connection is realized; the flexible printed circuit board can greatly reduce the volume and the weight of the electronic product, and is suitable for the development of the electronic product towards high density, miniaturization and high reliability.

The flexible printed circuit board has a single side, double sides and a multi-layer board. The adopted base material is mainly polyimide (PI film) copper clad laminate. The material has high heat resistance and good dimensional stability, and is pressed with a covering film with mechanical protection and good electrical insulation performance to form a final product. The surface layer and the inner layer conductor of the double-sided and multi-layer printed circuit board are electrically connected with the inner and outer layer circuits through metallization.

However, the flexible substrate PI film of the flexible wiring board is generally thin and is very easily torn from a defect in the edge portion. Therefore, in the actual use process, the cut flexible printed circuit board often cracks from the defect of the edge portion and extends from the edge portion to the circuit portion, which causes the flexible printed circuit board to have a phenomenon of disconnection and the like.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a flexible printed circuit board and LED lamp area in order to solve the shortcoming that exists among the prior art.

A flexible printed wiring board comprising a flexible base layer and a wiring layer covering the flexible base layer, the flexible printed wiring board comprising: a circuit area, wherein a circuit layer in the circuit area is provided with a conductive circuit; and an edge region which is an edge portion of the flexible printed wiring board and surrounds the circuit region; and a protective line is formed in the circuit layer of the marginal area, extends along the marginal line of the marginal area and is insulated from the conductive circuit in the circuit area.

Preferably, the width of the guard line is 0.2-0.3 mm.

Preferably, the distance between the guard line and the circuit area is 0.2-0.3 mm.

Preferably, the distance between the guard line and the edge line of the edge area is 0.2-0.3 mm.

Preferably, the circuit area includes: a main circuit region in which a main conductive line is formed; the connecting area is connected with the main circuit area, a connecting conductive circuit is formed on the circuit layer in each connecting area, and the connecting conductive circuit is electrically connected with the main conductive circuit; and edge parts which are not provided with circuits in the circuit layer and are arranged around the main circuit area respectively form the edge areas.

Preferably, the guard line is a metal line located at the same layer as a circuit layer in the circuit region.

An LED lamp strip comprises a circuit substrate and LED lamp beads fixed on the circuit substrate; the circuit substrate is the flexible printed circuit board, and the LED lamp beads are packaged in the circuit area and are electrically connected with the conductive circuits in the circuit area.

Preferably, the circuit region extends along the length direction of the LED strip, and the edge regions are located on the left side and the right side of the circuit region respectively; and a protective wire parallel to the extending direction of the LED lamp strip is respectively arranged in each edge region.

The utility model has the advantages that:

in the flexible printed circuit board and the LED lamp strip, a protective line is arranged in the edge area, and the protective line can delay or prevent the crack suture line from further extending inwards, so that the effect of protecting the conductive circuit in the flexible printed circuit board is achieved, and the product stability and reliability of the flexible printed circuit board are improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

fig. 1 is a schematic structural diagram of a flexible printed circuit board according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a LED lamp strip provided by an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The flexible printed circuit board is based on the circuit board of PI membrane for supporting the basic unit to include flexible basic unit and cover in flexible basic unit's circuit layer. The flexible base layer is a PI film, and the circuit layer is a copper foil layer.

As shown in fig. 1, the flexible printed wiring board includes: a circuit region 10 and an edge region 20 connecting the circuit region 10. Wherein, a conductive circuit is formed on the circuit layer in the circuit region 10; the edge region 20 is an edge portion of the flexible printed wiring board and surrounds the circuit region 10.

Specifically, the circuit area 10 includes: a main circuit region 11 and at least one connection region 12 connecting the main circuit region 11. A main conductive circuit is formed on the circuit layer in the main circuit area 11, and a connecting conductive circuit is formed on the circuit layer in each of the connecting areas 12, and the connecting conductive circuit is electrically connected to the main conductive circuit.

The main conductive circuit is a main circuit formed by etching in the flexible printed circuit board, and the connecting conductive circuit is a golden finger circuit used for being electrically connected with an external circuit.

It should be noted that the number of the connecting regions 12 may be 1, 2 or at least 3, which needs to be selected according to actual needs, and the present invention is not limited thereto.

The edge region 20 is an edge portion where no conductive line is disposed in the line layer and is disposed around the main circuit region 11. A guard line 201 is formed in the circuit layer of the edge region 20, and the guard line 201 extends along the edge line of the edge region 20 and is insulated from the conductive circuit in the circuit region 10.

Specifically, the guard line 201 is a metal line located at the same layer as the circuit layer in the circuit region 10. Moreover, the width of the guard line 201 is 0.2-0.3mm, the distance between the guard line 201 and the circuit area 10 is 0.2-0.3mm, and the distance between the guard line 201 and the edge line of the edge area 20 is 0.2-0.3 mm.

It should be noted that the protection line 201 extending along the edge line of the edge region 20 can reduce the occurrence of open circuit of the conductive circuit in the circuit region 10 caused by inward extension of the defect at the edge of the flexible printed circuit board due to the crack.

If the edge of the flexible printed circuit board has a defect left during cutting, and a cracking suture line extends inwards from the edge defect due to folding and bending in the use process, after the cracking suture line extends to the protection line 201, the protection line 201 has a certain width and is perpendicular to the extending direction of the cracking suture line, the cracking suture line can continue to extend inwards only after the protection line 201 is torn off, otherwise, the cracking suture line is blocked at the protection line 201, so that the protection line 201 can delay or prevent the cracking suture line from further extending inwards, thereby playing a role in protecting a conductive circuit in the flexible printed circuit board, and improving the product stability and reliability of the flexible printed circuit board.

Since the distance between the guard line 201 and the circuit area 10 is 0.2-0.3mm, the guard line 201 does not interfere with the conductive circuit in the flexible printed wiring board.

As shown in fig. 2, the utility model also provides a LED lamp area, include circuit substrate 210 and be fixed in circuit substrate 210's LED lamp pearl 220. The circuit substrate 210 is the above-mentioned the utility model provides a flexible printed circuit board. In the present embodiment, the area in which the LED driving circuit is disposed in the circuit substrate 210 constitutes the circuit area 10. The LED lamp beads 220 are packaged in the circuit area 10 and are electrically connected with the LED driving circuit in the circuit area 10.

In the LED light strip, the circuit region 10 extends along the length direction of the LED light strip, and the marginal regions 20 are respectively located at the left and right sides of the circuit region 10. Obviously, a guard line 201 parallel to the extending direction of the LED strip is disposed in each of the edge regions 20.

It should be understood that the protection wire 201 can prevent the LED strip from cracking from the edge defect to cause the LED driving circuit to be broken, thereby improving the service life of the LED strip.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all of which utilize the equivalent structure or equivalent flow transformation made by the content of the specification of the present invention, or directly or indirectly applied to other related technical fields, all included in the same way in the patent protection scope of the present invention.

Claims

1. A flexible printed wiring board comprising a flexible base layer and a wiring layer covering the flexible base layer, the flexible printed wiring board comprising:

a circuit area, wherein a circuit layer in the circuit area is provided with a conductive circuit; and

an edge region which is an edge portion of the flexible printed wiring board and surrounds the circuit region;

and a protective line is formed in the circuit layer of the marginal area, extends along the marginal line of the marginal area and is insulated from the conductive circuit in the circuit area.

2. The flexible printed wiring board of claim 1, wherein the guard line has a width of 0.2 to 0.3 mm.

3. The flexible printed wiring board of claim 1, wherein the guard line is spaced from the circuit area by 0.2 to 0.3 mm.

4. The flexible printed wiring board of claim 1, wherein the guard line is spaced from the edge line of the edge region by 0.2 to 0.3 mm.

5. The flexible printed wiring board of claim 1, wherein the circuit area comprises:

a main circuit region in which a main conductive line is formed; and

the connecting areas are connected with the main circuit area, a connecting conductive circuit is formed on a circuit layer in each connecting area, and the connecting conductive circuit is electrically connected with the main conductive circuit;

and edge parts which are not provided with conducting circuits in the circuit layer and are arranged around the main circuit area respectively form the edge areas.

6. The flexible printed wiring board of claim 1, wherein the guard line is a metal line on the same layer as a circuit layer in the circuit area.

7. An LED lamp strip is characterized by comprising a circuit substrate and LED lamp beads fixed on the circuit substrate;

the circuit substrate is the flexible printed circuit board as claimed in any one of claims 1 to 6, an LED driving circuit is arranged in the circuit area of the flexible printed circuit board, and the LED lamp beads are packaged in the circuit area and electrically connected with the LED driving circuit in the circuit area.

8. The LED light strip of claim 7, wherein the circuit region extends along a length direction of the LED light strip, and the edge regions are respectively located at left and right sides of the circuit region;

and a protective wire parallel to the extending direction of the LED lamp strip is respectively arranged in each edge region.