CN201789686U

CN201789686U - Flexible printed circuit board

Info

Publication number: CN201789686U
Application number: CN201020284483XU
Authority: CN
Inventors: 王金; 丁杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-08-06
Filing date: 2010-08-06
Publication date: 2011-04-06
Anticipated expiration: 2020-08-06

Abstract

The utility model discloses a flexible printed circuit board, wherein each flexible printed circuit board FPC corresponds to a printed circuit board assembly PCBA; the golden finger of the FPC is shorter than that of the PCBA; the FPC is a non-hollowed FPC; the rear end of the golden finger of the non-hollowed FPC is aligned with the rear end of the golden finger of the PCBA; and the outer end of the golden finger of the non-hollowed FPC is 0.6-1.2mm shorter than the outer end of the golden finger of the PCBA. The flexible printed circuit board can improve welding quality, improve production efficiency and reduce maintenance cost on welding faults.

Description

A kind of flexible PCB

Technical field

The utility model belongs to the circuit board technology field, particularly a kind of flexible PCB in the portable terminal.

Background technology

In the portable terminal product, extensively adopted the connected mode of welding class, welding class FPC has thin thickness, low cost and other advantages is widely used in the LCD LCD) in the designs such as FPc, side switch and microphone FPc.But no matter the conventional LCD FPC design of the class of mobile phone welding at present is to adopt manual welding, or the machine pressure welding, and welding quality is less stable all, and failure rate height such as rosin joint, short circuit, off normal reduce production efficiency, the maintenance cost height.At present, FPC and corresponding PCBA (PrintedCircuit Board Assemble, circuit board is joined in immediate shipment) when manual welding or machine welding, the temperature on flatiron or the pressure-welding head is difficult to import to fast on the PCBA golden finger, makes the scolding tin of PCBA golden finger be difficult to be dissolved into fast among the FPC, weld time is long, efficient is low, and depends through hole alone and can't guarantee that enough soldering tin amounts are exuded in the FPC golden finger poor welding quality, be easy to generate rosin joint, defective productss such as few weldering.

The utility model content

Technical problem to be solved in the utility model provides a kind of flexible PCB, can improve welding quality.

In order to solve the problems of the technologies described above, the utility model provides a kind of flexible PCB, the corresponding wiring harness plate PCBA of each flexible PCB FPC, and the golden finger of FPC is than the short 0.08-2.0mm of the golden finger of PCBA.Described flexible PCB, wherein, described FPC is non-hollow out type FPC, align with the rear end of PCBA golden finger in the rear end of described non-hollow out type FPC golden finger, the short 0.6-1.2mm in PCBA golden finger outer end that described non-hollow out type FPC golden finger outer end is corresponding.

Described flexible PCB, wherein, described non-hollow out type FPC golden finger pastes the solder side length of PCBA than the long 0.3-0.8mm of non-solder side length.

Described flexible PCB wherein, has a through hole at least on each golden finger of described non-hollow out type FPC, the through hole on each golden finger is arranged with the through hole dislocation on portion's golden finger mutually.

Described flexible PCB, wherein, the diameter of described through hole is 0.5mm.

Described flexible PCB, wherein, the outer end of described non-hollow out type FPC golden finger is an arc.

Described flexible PCB, wherein, the outer end of described golden finger is the arc of radius 0.2mm.

Described flexible PCB, wherein, described FPC is hollow out type FPC, and described hollow out type FPC golden finger is positioned at the middle part of PCBA golden finger, and its two ends are than the short respectively 0.25-1.mm in the two ends of PCBA golden finger.Described flexible PCB, its wherein, the back side of described FPC is provided with gum layer, this gum layer is provided with and tears the hand position.

Adopt flexible PCB provided by the utility model, can promote welding quality, enhance productivity, also reduced the solder failure maintenance cost simultaneously.

Description of drawings

Fig. 1 is the utility model hollow out type LCD FPC location hole design diagram;

Fig. 2 is the non-hollow out type of a utility model LCD FPC gum design diagram;

Fig. 3 is the utility model hollow out type LCD FPC hollow out back gauge designing requirement schematic diagram;

Fig. 4 is the schematic diagram of through hole on the non-hollow out type of the utility model LCD FPC golden finger.

Embodiment

As Fig. 1, Fig. 2, Fig. 3, shown in Figure 4, the utility model can better weld together in order to make FPC and PCBA, adopted the dislocation matching Design, make the length and width size of FPC golden finger no longer be equal to the length and width size of corresponding PCBA golden finger, assurance has enough soldering tin amounts to be exuded on the FPC golden finger, thereby improves welding quality.Design FPC golden finger is than the short 0.5-1mm of PCBA golden finger.For non-hollow out type FPC, the rear end of its golden finger and PCBA go up the alignment of golden finger rear end, and the golden finger outer end is the short 0.5-1mm in outer end of corresponding PCBA golden finger; For hollow out type FPC, its golden finger is positioned at the middle part of PCBA golden finger, its two ends are than the short respectively 0.2-0.5mm in the two ends of PCBA golden finger, and promptly the rear end of hollow out type FPC golden finger is than the short 0.25-0.8mm in the rear end of PCBA golden finger, and the outer end of hollow out type FPC golden finger is than the short 0.25-0.8mm in outer end.Preferably FPC golden finger width can also be than the little 0.05-0.1mm of PCBA golden finger width of correspondence.Preferably, can also be near the FPC golden finger position reserve 2 or 4 welding location holes, be connected with corresponding PCBA by reference column or other connectors, thereby make the golden finger of FPC be connected tightr with the golden finger of PCBA.Preferably, a gum layer can also be set at the back side of FPC, FPC can be connected with PCBA more closely by this gum layer.The utility model is described in further detail below in conjunction with accompanying drawing.

Figure 1 shows that the schematic diagram of location hole on the hollow out type LCD FPC, the location hole of non-hollow out type FPC can be with reference to realization.Reserve on the LCD FPC 2 or 4 (reserves 4 promptly the two pairs of location holes be in order to cooperate the PCBA layout, the layout according to PCBA when being connected with PCBA can be selected any a pair of location hole flexibly for use) diameter can be in 1.omm weld and use location hole 11 and location hole 12.Be scholar 0.1 apart from tolerance in two holes.The location hole tolerance be the scholar o.05mm.Among the figure 13 is gum layer.Figure 2 shows that gum design on the non-hollow out type LCD FPC, the gum layer of hollow out type FPC can be with reference to realization.LCD FPC is provided with and helps welding the fixedly gum layer 21 of usefulness, and adds on the centrifugal paper of gum layer and tear hand position 22, uses with convenient.On this FPC, be provided with two pairs of location holes, see 23.Figure 3 shows that hollow out type LCD FPC golden finger back gauge schematic diagram, the golden finger levels adopts zinc-plated processing, be to guarantee FPC intensity, the hollow out zone apart from the minimum distance 31 at FPC edge more than or equal to 0.8mm.Figure 4 shows that golden finger through hole schematic diagram on the non-hollow out type LCD FPC, consider the needs of heat transfer and stannize, preferably reserve at least one through hole 41 on each golden finger, through-hole diameter is preferably 0.3mm.Through hole dislocation on through hole on each golden finger and the adjacent golden finger is arranged.Above design all is in order to improve welding quality.The both sides of through hole are two sections outstanding circular arcs 42, and this is in order to increase the intensity of golden finger.The outer end of golden finger (or claim top, be the end away from the FPC entity) is arc, and through hole and arc design all are for can better stannize, thereby guarantee welding quality.

Claims

1. a flexible PCB is characterized in that, the corresponding wiring harness plate PCBA of each flexible PCB FPC, and the golden finger of FPC is than the short 0.08-2.0mm of the golden finger of PCBA.

2. flexible PCB according to claim 1, it is characterized in that, described FPC is non-hollow out type FPC, aligns with the rear end of PCBA golden finger in the rear end of described non-hollow out type FPC golden finger, the short 0.6-1.2mm in PCBA golden finger outer end that described non-hollow out type FPC golden finger outer end is corresponding.

3. flexible PCB according to claim 2 is characterized in that, described non-hollow out type FPC golden finger pastes the solder side length of PCBA than the long 0.3-0.8mm of non-solder side length.

4. flexible PCB according to claim 2 is characterized in that, has a through hole on each golden finger of described non-hollow out type FPC at least, and the through hole on each golden finger is arranged with the through hole dislocation on portion's golden finger mutually.

5. flexible PCB according to claim 4 is characterized in that, the diameter of described through hole is 0.5mm.

6. flexible PCB according to claim 2 is characterized in that, the outer end of described non-hollow out type FPC golden finger is an arc.

7. flexible PCB according to claim 6 is characterized in that, the outer end of described golden finger is the arc of radius 0.2mm.

8. flexible PCB according to claim 1 is characterized in that, described FPC is hollow out type FPC, and described hollow out type FPC golden finger is positioned at the middle part of PCBA golden finger, and its two ends are than the two ends difference 0.25-1.mm of PCBA golden finger.

9. according to the described flexible PCB of arbitrary claim among the claim 1-8, it is characterized in that the back side of described FPC is provided with gum layer, this gum layer is provided with and tears the hand position.