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A flexible circuit board introduction

The flexible printed circuit board (Flexible Printed Circuit Board) is also called"soft board", is made of flexible

Insulating printed circuit substrate made of rigid printed circuit board has manyadvantages compared with. For example, it can be

In order to free bending, winding, folding, can be arranged in accordance with therequirements of arbitrary spatial layout, and any shift in three-dimensional space

Dynamic and scalable, so as to achieve the integration of component assemblyand wire connection. Using FPC can greatly reduce the electronic products.

Product size, the need for electronic products to the development of high density,miniaturization, high reliability direction. Therefore,

FPC in aerospace, military, mobile communication, portable computer, computer peripherals, PDA, digital cameras and other fields or

Product has been widely used.

FPC also has good heat resistance and solderability and easy assembly, lowcomprehensive cost advantage even,

Design of soft and hard combination also make up the flexible substrate inelement bearing slightly the limitations in a certain extent.

Flexible printed circuit boards have single, double sided and multilayer boardpoints. The polymer substrate

Imide CCL based. This material has a high heat resistance, good dimensional stability, and both mechanical

Into final products covering film protection and good electrical insulation performance by suppressing. Double-sided, multilayer printed wiring

Plate surface and the inner conductor through the realization of the inner layer and the outer layer metal electrical circuit

Connection.

Flexible circuit board function can be divided into four kinds, respectively is guideline (LeadLine), printed circuit (Printed

Circuit), connectors (Connector) and multi function integrated system (Integrationof Function)

The use of covered, computers, computer peripheral auxiliary system, consumerappliances and motor vehicles such as the scope of.

Category two, the flexible circuit board

After 1, single panel uses a single PI copper clad plate material on the line is completed, and then covered with a layer of protective film, forming

A flexible circuit board only single conductor.

2, ordinary double panel using double-sided PI board copper clad plate materialsto complete the double-sided circuit, both sides are respectively coupled with a

Layer of protective film, become a kind of circuit board with double conductor.

3, the substrate generated single panel used in the circuit during the preparing process of pure copper material, respectively, in the two sides of the plus onehas in

Layer of protective film, become a kind of only single-layer conductor but double-sided circuit board in circuit board conductors are exposed.

The 4 generation, substrate double-sided board using two layer single sided PIcopper clad plate material with in middle window location specific viscosity

Press in local area of gellan gum, become a pressing, local area doubleconductor line two layer separating structure plate

In order to achieve a high flexural performance of circuit board in the stratifiedregion.

Three, the advantages and disadvantages of flexible circuit board:

1, the advantages of:

(1) can be bent freely, winding, folding, can be arranged in accordance with therequirements of arbitrary spatial layout, and in three dimensional space

Any movement and expansion, so as to achieve the integration of component assembly and wire connection;

(2) the use of FPC can greatly reduce the volume and weight of electronic products, suitable for electronic products to high density, small

The need of high reliable, development direction. Therefore, FPC in aerospace,military, mobile communication, portable computer,

Computer peripherals, PDA, digital cameras and other fields or product has been widely used;

(3) the FPC has good heat resistance and solderability and easy assembly, lowcomprehensive cost advantage even, soft

The design of hardware combination also make up the flexible substrate inelement bearing slightly the limitations in a certain extent.

2, disadvantages:

(1) a one-time high initial cost due to soft PCB is manufacturing and design, for special applications, so the beginning of

Circuit design, wiring and photographic plate by the cost of higher. Unless there is a special need to the application of soft PCB,

Usually a small amount of application, it is best not to use.

(2) soft PCB changes and repair more difficult soft PCB once made, to changefrom the base or to

The preparation of light painting the beginning of the program, so it is not easy tochange. Covered with a layer of protective film on the surface, to remove the pre patch,

After the repair and restoration, it is more difficult to work.

(3) the limited size of soft PCB in is not general situation, usually made of batchprocess, and therefore subject to

Equipment size is limited, can not be very long, very wide.

(4) the improper operation is easy to damage the connected personnel improper operation is easy to cause damage to the flexible circuit, the soldering and rework

Need to operate the trained personnel.

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