Archive for the ‘FR4 PCB’ Category

What is copper black pcb? Copper black PCB, full name copper-based black solder mask PCB, is a circuit board made of special black solder mask ink on the basis of traditional PCB. Compared with the traditional green solder mask, the black solder mask has good light shielding performance, which can reduce the interference of light on sensitive components on PCB. The special ingredients in it can enhance the electromagnetic shielding performance of PCB to a certain extent and reduce the impact of external electromagnetic interference on electronic equipment.

What are the common colors of PCB?

Common colors of PCB include green, blue, black, red, yellow, white, purple and brown. These colors are mainly used for identification, aesthetics and special applications. Although they do not affect circuit performance, they play an important role in product design.

Green is the most common color because green solder mask ink is cost-effective, has good visual contrast, is easy to check welding quality and circuit layout, and is friendly to the human eye.

Blue has also gradually increased in recent years, providing a different visual effect from green, appearing novel and high-end, and is suitable for electronic products that pursue product appearance differentiation.

Black gives people a high-end and mysterious feeling. It is often used in high-end audio equipment, gaming hardware, etc., but the production process has high process requirements and defects are difficult to detect.

Red is often used in high-end communication equipment, military electronic products, etc., because it has good thermal stability and weather resistance, and is suitable for use in high temperature and harsh environments.

Yellow was once widely used, but it is now less used due to poor contrast with routing and screen printing.

White looks clean and neat in various environments, but it is less used because it easily hides routing.

Colors such as purple, brown and pink are also used, but they are relatively rare.

The choice of these colors not only affects the appearance and brand image of the product, but also reflects the cost considerations of designers and manufacturers to a certain extent.

What is black core pcb?

Black core PCB is a multi-layer PCB board that is favored for its unique manufacturing process and performance. The manufacturing process of black core PCB includes multiple complex steps to ensure its excellent quality and performance and meet the needs of electronic equipment for complex circuits.

• Layout finishing: Engineers need to organize and check the PCB layout to ensure that the CAD file is converted into a unified format and meets the requirements of the manufacturing process.

• Core board production: Clean the copper clad board and use UV lamp to cure the copper foil under the photosensitive film to form the required circuit layout.

• Core board punching and inspection: This step ensures the precise alignment between layers.

• Lamination technology: Use prepreg as adhesive and insulating material to fix the layers at high temperature.

• Drilling and hole wall copper chemical precipitation: Prepare for electroplating.

• Outer PCB etching: Complete the production of the entire multi-layer PCB layout.

• Solder mask: Apply solder mask to prevent the copper circuit from contacting the outside world.

• Silk screen: Silk screen component identification symbols, test points and other marks on the PCB.

• Surface treatment: Apply a protective layer such as OSP (organic solderability protective layer) or gold.

• Solder mask window: Remove the solder mask through UV light and etching to expose the pad.

The black color of black core PCB usually comes from the special ink used in the solder mask layer. Compared with other colors of solder mask ink, it may have higher UV resistance, better protect the PCB from damage when exposed to sunlight for a long time, and has better electromagnetic shielding performance, which can reduce the impact of external electromagnetic interference on the circuit on the PCB.

What are the advantages of black core PCB?

The advantages of black core PCB mainly include the following aspects:

• Better heat dissipation performance: Black core PCB uses a black substrate, which can better absorb and release heat. Therefore, in a high-temperature working environment, black core PCB can better dissipate heat and ensure the normal operation of the circuit board.

• Superior electromagnetic shielding performance: The black solder mask used in black core PCB provides better electromagnetic compatibility and radio frequency interference shielding effect, which helps to reduce signal interference.

• Higher reliability: The substrate of black core PCB has good heat dissipation performance, which can effectively solve the problems of aging of traditional circuit board substrate and capacitor leakage, thereby improving the reliability and durability of the circuit board.

• Beautiful and anti-plagiarism: Black PCB board gives people a high-end and technological impression, which is suitable for some high-end electronic products.

What are the disadvantages of black core PCB?

The main disadvantages of black core PCB include the following:

• Cost issue: Because black ink has a higher coverage requirement and stricter manufacturing accuracy requirements, this increases the difficulty and cost of production.

• Difficulty in detection: Although black PCB can improve the visibility of soldering quality in some cases, under some lighting conditions, the black surface may reflect light, making it difficult to identify small defects during automatic optical inspection (AOI).

• Thermal expansion problem: Because black PCB has strong heat absorption performance, this may cause the thermal expansion rate of PCB to increase under high temperature environment, thus affecting the long-term stability and reliability of the circuit board.

• Color difference problem: In the process of washing PCB, black is the most likely to cause color difference, which will cause the PCB defect rate to increase due to color difference.

Common misunderstandings about black core PCB

Some people think that black PCB is difficult to produce, costly, and has high maintenance costs. But in fact, the production cost of black PCB is not necessarily higher than other colors, and the maintenance cost is related to product quality control, not color.

The second misunderstanding is that black core PCB is only suitable for high-end applications, which is also incorrect. Black printed circuit boards can be used in any application, from high-end to low-end, and black PCBs may be used in products of all grades. The grade of the product cannot be judged simply by the color of the PCB.

Some people think that the circuit routing of black PCB is difficult to identify, which increases the difficulty of later maintenance and debugging. But in fact, debugging is assisted by drawings, and maintenance mainly relies on tools and experience, rather than identifying circuit routing with the naked eye.

What are the applications of black core PCB?

The application field of black core PCB is very wide, mainly including the following aspects:

• Smartphones: Black core PCB has good electromagnetic compatibility and radio frequency interference shielding effect, which can ensure the stable operation of mobile phones in complex electromagnetic environments, and the black appearance is consistent with the overall design style of the mobile phone, which improves the texture and aesthetics of the product.

• Computer field: Black core PCB has important applications in computers, especially in high-performance hardware such as CPU and graphics card. Black core PCB provides a stable operating platform to ensure the stable operation of the equipment.

• Camera: The excellent electrical performance and anti-interference ability of black core PCB can meet the needs of cameras, and its black appearance is consistent with the professional image of cameras, which can enhance the overall quality of cameras.

• Medical devices: Black core PCBs are also used in medical devices, such as MRI, CT, color ultrasound and other equipment to ensure the stable operation and signal transmission of the equipment.

Why are common PCBs all green solder mask?

The main reasons for the common PCBs to use green solder mask include the following aspects:

• Performance and visual effects: First, the visual effect of green ink in the yellow light room is better than other colors, making the logo and tracking lines on the circuit board more clearly visible. In the surface mount technology (SMT) welding process, the green background has a good recognition effect on the instrument, which helps to improve production efficiency and quality.

• Environmental protection and cost considerations: Compared with blue and black inks, green ink is more environmentally friendly. Blue ink is doped with cobalt and black ink is doped with carbon. These components may release toxic gases at high temperatures. Green ink does not contain these components, so it is safer.

• Convenience of observation and maintenance for workers: Under strong light, green has minimal stimulation to the eyes, which helps reduce eye fatigue and enables workers to maintain clear vision for longer.

• Usage habits and brand recognition: Due to the advantages of green ink in many aspects, it has become the preferred color in PCB manufacturing. This usage habit has been continued and consolidated for a long time.

In short, copper black PCB, as a special type of PCB, features a black solder mask, which not only improves the texture and grade of the product, but also performs well in terms of light blocking, electromagnetic shielding performance, heat dissipation performance, etc., meeting the diverse needs of PCBs in different fields, and playing an important role in high-end electronic products, optical equipment, automotive electronics and medical equipment.