PCB News - Read it in one article! Lifting the mystery of FPC circuit boards

Read it in one article! Lifting the mystery of FPC circuit boards

1. Product definition

FPC-flexible circuit board, also known as flexible circuit board, abbreviated as soft board; it is made of polyester film or polyimide as the base material and formed by etching on the copper foil to form a circuit with high reliability. Printed circuit with excellent flexibility.

2. Material

1. Insulating film

The insulating film forms the base layer of the circuit, and the adhesive bonds the copper foil to the insulating layer. There are many types of insulating film materials, but the most commonly used are polyimide and polyester materials.

2. Conductor

Copper foil is suitable for use in flexible circuits. It can be electrodeposited or plated.

3. Adhesive

In addition to bonding the insulating film to the conductive material, the adhesive can also be used as a covering layer, as a protective coating, and as a covering coating.

Three, product characteristics

1. Short: short assembly hours

All lines are configured. Eliminate the need to connect redundant cables.

2. Small: smaller than PCB

Can effectively reduce the product volume. Increase the convenience of carrying.

3. Light: lighter than PCB (hard board)

Can reduce the weight of the final product.

4. Thin: thickness is thinner than PCB

Can improve the flexibility. Strengthen the assembly of three-dimensional space in a limited space.

Four, product classification

According to the number of conductor layers, FPC can be divided into single-sided board, double-sided board and multi-layer board.

1. Single panel: only one side conductor.

2. Double-sided board: There are two-sided upper and lower conductors. To establish an electrical connection between the two layers of conductors, a bridge-a via hole must be passed. Vias are small holes plated with copper on the wall of the hole, which can be connected with wires on both sides.

3. Multilayer board: contains three or more layers of conductors, and the wiring is more precise.

Note: Except for single-sided boards, the number of layers of hard boards are basically even-numbered layers, such as 2, 4, 6, 8 layers, etc. There are few odd-numbered layers, mainly because the odd-numbered laminated structure is asymmetrical, and the board is easy to warp. The soft board is different, there is no problem of board warping, so 3-layer, 5-layer, etc. are common.

Five, product use

1. Cameras, video cameras;

2. CD-ROM, DVD;

3. Hard drives, laptops;

4. Telephone, mobile phone;

5. Printers, fax machines;

6. Television;

7. Medical equipment;

8. Automotive electronics;

9. Aerospace and military products.

Six, production process

1. Prenatal treatment

The first is FPC board engineering evaluation, mainly to evaluate whether the customer's FPC board can be produced;

The next step is to prepare materials to meet the supply of raw materials in each production link;

Finally, the engineer processes the customer's drawings and documents, and then delegates them to the production department, document control, purchasing and other departments, and enters the regular production process.

2. Production process

(1) Single panel production

Cutting - Drilling - Pasting Dry Film - Aligning - Exposure - Developing - Etching - Stripping - Surface Treatment - Covering Film - Pressing - Curing - Surface Treatment - Immersion Nickel Gold - Printing Characters - Cutting - Electrical Measurement - Punching Cutting - final inspection - packaging - shipment

(2) Double panel production

Cutting - Drilling - PTH - Electroplating - Pre-treatment - Dry Film Pasting - Alignment - Exposure - Development - Graphic Plating - Stripping - Pretreatment - Dry Film Pasting - Alignment Exposure - Development - Etching - Stripping - Surface Treatment - Paste the cover film - Pressing - Curing - Immersion of nickel gold - Printing characters - Shearing - Electrical test - Punching - Final inspection - Packaging - Shipment
ipcb is a high-precision, high-quality PCB manufacturer, such as: isola 370hr PCB, high-frequency PCB, high-speed PCB, ic substrate, ic test board, impedance PCB, HDI PCB, Rigid-Flex PCB, buried blind PCB, advanced PCB, microwave PCB, telfon PCB and other ipcb are good at PCB manufacturing.