PCB Laser Marking Machine

in Electronic Components, ,
PCB Laser Marking Machine

PCB laser marking is a process that uses laser technology to mark printed circuit boards (PCBs). It uses a high-energy laser beam to create permanent marks directly on the PCB surface without the use of inks, chemicals, or mechanical scoring. Laser marking can achieve various marking effects, such as text, graphics, QR codes and barcodes, etc. This method has the advantages of non-contact, high precision, high speed, and automatability, and is widely used in the marking and identification process of PCB in the electronics manufacturing industry.

What are the main features of PCB laser marking?

PCB laser marking technology is widely used in the electronics manufacturing industry, providing efficient and high-quality solutions for marking and identifying printed circuit boards.

Non-contact: Laser marking is a non-contact marking method. The laser beam acts directly on the PCB surface without physical contact, thus avoiding damage and deformation of the circuit board.

High precision: The high-energy beam of the laser system can achieve very small mark size and high resolution, thereby creating precise and clear mark patterns on PCB, suitable for applications requiring high precision.

High speed: Laser marking machines can achieve fast marking speed, greatly improving the production efficiency of printed circuit board manufacturing. The laser beam moves quickly and can mark continuously or intermittently according to preset parameters.

Durability: Marks formed by laser marking machines have good durability and abrasion resistance on the PCB surface. They can withstand the chemical treatment and cleaning during the PCB manufacturing process and the environmental effects during normal use, and remain visible for a long time.

Versatility: Laser marking systems can achieve various marking effects, including text, graphics, QR codes, barcodes, etc. They can be customized as needed and are suitable for different types of PCB materials, such as FR4, metal substrates, etc.

Flexibility: Laser marking has good flexibility and adjustability. By adjusting the laser marker parameters, marking effects of different depths, colors, and contrasts can be achieved to suit different applications.

What types of machines are used for PCB laser marking?

The main types of laser marking machines used to complete PCB laser marking include the following:

Fiber laser marking machine: Fiber laser marking machine transmits laser beam through optical fiber, which has high efficiency and high-quality marking effect. They are suitable for various materials, including metallic and non-metallic PCB materials.

LX-A104-handheld fiber laser marking machine 01
handheld fiber laser marking machine

CO2 laser marking machine: The CO2 laser marking machine uses a CO2 gas laser source and is suitable for flammable materials, such as resin substrates and plastic substrates.

LX-B3 Stable Flying CO2 Laser Marker with Conveyor
Flying CO2 Laser Marking Machine with Conveyor

UV laser marking machine: UV laser marking machine uses UV laser as the light source, which has very high photon energy and good directionality. It can mark all kinds of materials with fine and high definition, especially suitable for marking small, high-precision, and high-value-added PCB boards.

desktop 3d uv laser marker
Desktop 3D UV Laser Marking Machine

Nanosecond pulse laser marking machine: Nanosecond pulse laser marking machine marks with very short pulse times, which can achieve tiny and fine marks and is suitable for applications requiring high resolution and high precision.

Picosecond pulse laser marking machine: The pulse time of the picosecond pulse laser marking machine is shorter, which can achieve even finer marking effects. They are suitable for applications with minimal material impact, such as marking sensitive electronic components.

These laser marking machines can achieve precise marking of PCBs by adjusting laser parameters and beam focus. Choosing the right laser marking machine depends on factors such as the desired marking effect, material type, and production needs.

What is the process of PCB laser marking?

Preparation: First, place the PCB to be marked on an appropriate positioning device to ensure that its position is stable. Also, set up the laser marking system and corresponding parameters.

Design marking content: As needed, design the text, graphics, QR code or barcode to be marked on the PCB in computer-aided design (CAD) software.

Adjust laser marking parameters: According to the type of PCB material and the required marking effect, adjust the parameters of the laser marking system, such as power, frequency, scanning speed and focal length, etc.

Marking: After starting the laser marking system, the laser beam will be focused and precisely positioned to a specific position on the PCB surface, and then marked in the form of high-energy pulses. The laser beam interacts with the PCB surface, creating a chemical or physical reaction that marks the surface.

Inspection and Cleaning: After completing laser marking, inspect the mark for quality and accuracy. If necessary, the marked area can be cleaned with detergent or gas to remove any remaining dust or stains.

What types of markings can be achieved with PCB laser marking machine?

PCB laser marking machine can achieve many types of markings, including but not limited to the following:

Text: Text, numbers, or letters can be printed on the PCB surface to identify components, serial numbers, dates, and other information.

Graphic: Various graphics can be drawn on PCB through laser marking, such as lines, rectangles, circles, polygons, etc.

QR code and barcode: Laser marking technology can generate QR codes or barcodes on the PCB surface for scanning and identifying product information, tracking and inventory management, etc.

Logo and trademark marking: Logo, trademark, or brand name can be marked on PCB with high precision to increase product recognition and value.

Serial number and batch number marking: Unique serial number and batch number can be printed on the PCB to trace the product’s production process and quality control.

Line marking: The lines of the PCB can be marked by laser marking to help assembly workers perform correct welding and connection operations.

Adjust resistor and capacitor markings: Laser marking technology can be used to print resistance value, capacitance value, accuracy, and other information on resistors and capacitors to improve product recognizability and reliability.

The specific marking type depends on factors such as design requirements, product specifications, and manufacturing processes.

Is it possible for laser marking to cause damage to PCBs or affect circuit performance?

When used correctly and handled appropriately, laser marking generally does not cause damage to PCBs or significantly affect circuit performance. However, there are a few points to note:

Choose appropriate laser parameters: Using too high a laser power or using an inappropriate laser wavelength may cause the PCB material to melt, burn, or char, causing damage. Therefore, appropriate laser parameters must be selected based on factors such as the characteristics and thickness of the PCB material.

Avoid excessive heat input: Excessive heat input may cause local deformation of the PCB or subject circuit components to thermal stress, thereby affecting circuit performance. Therefore, during laser marking, laser energy and action time should be controlled to avoid excessive heat input.

Prevent misoperation and incorrect marking: Incorrect operation or wrong marking position may cause damage to the PCB. Ensure correct positioning and stable clamping, and mark in strict accordance with the design requirements to avoid laser marking of irrelevant areas or sensitive components.

Outer layer protection: For PCBs with outer layer protection (such as copper-clad laminates), care must be taken not to damage the protective layer during laser marking. Appropriate masking or other protective measures can be taken before marking.

To sum up, the impact of laser marking on PCB is usually controllable and will not have a significant negative impact on circuit performance under reasonable operation. However, when using a laser marking machine, you still need to exercise caution and follow the manufacturer’s recommendations and safety guidelines to ensure the integrity of the PCB and circuit performance.

Will the laser marks be durable enough to withstand regular PCB handling and environmental conditions?

Laser marking uses a high-energy laser beam to imprint marks directly on the surface of an object, forming a permanent mark. This marking method will not peel, fade, or be affected by chemicals, making it extremely durable. It can withstand common PCB handling processes such as cleaning, solvents, and temperature changes, while also maintaining readability over time in harsh environmental conditions.

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