Conductive adhesive tape solutions for electronic products
Demand characteristics of electronic products for conductive adhesive tape
Good electrical conductivity
Electronic products within the circuit connection and electromagnetic shielding applications, conductive tape is required to have a stable and efficient conductive properties. For example, in the smart phone motherboard and shielding shield connection, conductive tape needs to ensure good electrical conductivity, so that the signal can be stable transmission, to prevent electrostatic buildup and electromagnetic interference damage to electronic components. Its conductive properties are usually realized by adding metal particles (e.g., silver, copper, etc.) to the adhesive, which form a conductive pathway so that the tape can effectively conduct current after lamination.
For high-frequency electronic products, such as 5G communication equipment, conductive adhesive tape conductivity also needs to meet the requirements of high-frequency signal transmission. High-frequency signals in the transmission process is susceptible to loss and reflection, high-quality conductive adhesive tape can provide low-resistance, low-inductance conductive path, reduce signal attenuation, to ensure the integrity of high-frequency signals.
Excellent adhesion and lamination
Components of electronic products usually have a variety of shapes and surface materials, conductive adhesive tape needs to be able to be firmly affixed to the surface of a variety of materials, such as plastic, metal, glass, etc.. For example, in the tablet computer display and frame of the fit process, conductive tape to be able to tightly fit the glass surface of the display and frame of the metal or plastic surface, to prevent gaps, so as to avoid dust, moisture and other equipment into the interior.
Adhesive also need to have a certain degree of durability, can be in the whole life cycle of electronic products to maintain a good paste effect. Because electronic products in the process of use may be subject to temperature changes, vibration and other factors, conductive adhesive tape must be able to withstand the test of these environmental factors, there will be no phenomenon of degumming.
Electromagnetic shielding performance
With the increasing integration of electronic products, electromagnetic compatibility (EMC) is increasingly important. Conductive adhesive tape in many cases need to play the role of electromagnetic shielding, to prevent external electromagnetic interference into the internal equipment, and at the same time to prevent the internal electromagnetic signals to the outside radiation. For example, in the notebook computer shell assembly, the use of conductive tape can be connected to the metal shell into a complete electromagnetic shielding body, effectively protect the internal CPU, hard disk, memory and other key components from external electromagnetic interference, but also reduces the internal circuitry generated by the impact of electromagnetic radiation on other equipment.
Thin and light characteristics
Electronic products continue to develop in the direction of thin and light, which requires conductive adhesive tape can not increase the thickness and weight too much. For example, in smart watches and other wearable devices, the internal space is very limited, conductive adhesive tape must be thin enough to realize the circuit connection and electromagnetic shielding without affecting the overall thickness of the device under the premise.
Conductive adhesive tape solutions in different components of electronic products
Circuit board components
Chip encapsulation and heat dissipation: In the process of chip encapsulation, conductive adhesive tapes can be used for the connection between the chip and the heat sink. As the chip will generate a lot of heat in the process of work, the need for heat dissipation through the heat sink will heat out. Conductive tape can not only provide a good heat conduction path to help the chip dissipate heat, but also to ensure electrical conduction between the chip and the heat sink to achieve grounding and other functions. For example, some high-performance CPU packages use conductive adhesive tape containing highly thermally conductive metal particles, which can effectively transfer the heat generated by the chip to the heatsink, and at the same time ensure that the chip is well grounded to prevent electrostatic damage.
Circuit connection and signal transmission: in the circuit board, conductive adhesive tape can be used to connect some tiny electronic components, such as resistors, capacitors, etc.. For some components that can not be connected by traditional welding, conductive tape provides a simple and effective way to connect. It ensures stable signal transmission between components, and because of its flexibility, it can adapt to the tiny deformation of the circuit board in different environments. For example, in the connection of flexible circuit boards (FPC), conductive adhesive tape can be well adhered to the curved surface of the FPC to achieve a reliable circuit connection.
Display components
Display and frame connection: Conductive adhesive tapes are used to tightly fit the display to the frame, playing the dual role of fixing the display and realizing electromagnetic shielding. During the lamination process, the adhesive tape ensures that there is no gap between the display and the bezel, preventing dust and water vapor from entering the device. At the same time, its conductive properties can guide the static electricity generated by the display to the bezel, avoiding static electricity damage to the display. For example, in smart phones and LCD monitors, this connection is widely used and can effectively improve the reliability and service life of the product.
Touch screen conductive connection: For touch screen devices, conductive adhesive tape can be used to connect the conductive layer of the touch screen and the circuit board. Touch screen by sensing changes in the electric field of the human body to realize the touch operation, conductive tape needs to ensure that the conductive path between the touch screen and the circuit board is smooth, the touch signal is accurately transmitted to the circuit board for processing. At the same time, it also needs to have good transparency to avoid affecting the display effect of the touch screen. Some high-end touch screen devices use transparent conductive adhesive tape, which ensures conductive properties at the same time, with high transparency and low haze characteristics, to provide users with a clear touch operation experience.
Housing and internal component connection
Electromagnetic shielding overall solution: in the shell assembly of electronic products, conductive adhesive tape is one of the key materials to achieve electromagnetic shielding. By connecting the various metal parts of the shell with conductive adhesive tape, a complete electromagnetic shielding body can be formed. For example, in the metal shell of the notebook computer, conductive adhesive tape is used to connect the upper cover, lower cover and frame and other parts, so that the shell becomes a Faraday cage, effectively blocking the external electromagnetic interference into the internal equipment, but also to prevent the internal electromagnetic radiation leakage out. This electromagnetic shielding measures to improve the electromagnetic compatibility of electronic products is essential to ensure that the equipment in the complex electromagnetic environment for normal operation.
Grounding connection and electrostatic discharge: conductive tape can also be used for shell and internal circuit board ground connection. When electronic products are subjected to electrostatic discharge (ESD), conductive tape can quickly guide the static electricity to the earth, to protect the internal electronic components from electrostatic damage. For example, in some of the static-sensitive electronic equipment, such as electronic chip manufacturing equipment and high-precision electronic measuring instruments, through the use of conductive tape between the shell and the grounding pins, can effectively prevent the accumulation of static electricity and electrostatic discharge damage to the equipment.
