FR4 reinforcement refers to the use of FR4 material in certain specific areas or areas to reinforce the structure of a circuit board or improve its mechanical strength. FR4 (Flame Resistance 4) is a common glass fiber reinforced epoxy resin material used in the manufacture of rigid circuit boards.

Here are some important information about FR4 reinforcement:

1. Reinforcement purpose: In some circuit board designs, additional strength support or mechanical strength may be required in certain areas, such as in connector plug-in areas, near screw holes, or thinner circuit board sections. FR4 reinforcement can strengthen these areas, providing better structural stability and reliability.

2. FR4 reinforcement method: FR4 reinforcement is usually achieved by adding one or more layers of FR4 material to a specific area of the circuit board. This can be a sheet material in the form of pre impregnated fiberglass cloth, which is then combined with copper foil to form a reinforcement layer with high mechanical strength through hot pressing or lamination.

3. Reinforcement design considerations: When considering FR4 reinforcement in the design, the following points should be noted:

4. Regional positioning: Clearly define the areas that require reinforcement, such as connector positions, pressure points, or areas that may be affected by external forces.

5. Laminated structure: Determine the number and position of reinforcement layers, as well as their thickness and stacking method with other layers.

6. Reinforcement thickness: Select an appropriate reinforcement layer thickness according to design requirements and mechanical strength requirements.

7. Capacity impact: In reinforcement design, it is necessary to consider the impact of reinforcement layers on the overall circuit board wiring and signal characteristics.

8. FR4 reinforcement application: FR4 reinforcement is commonly used in circuit board designs that require strength enhancement, such as industrial control equipment, automotive electronic systems, military equipment, etc. in high vibration environments. By using FR4 reinforcement, the mechanical stability and reliability of circuit boards can be improved, reducing the risk of possible damage or damage.

In summary, FR4 reinforcement is achieved by adding FR4 material layers to specific areas of the circuit board to improve its mechanical strength and structural stability. It is a commonly used enhancement technique suitable for application scenarios that require high structural strength of circuit boards.