Monthly Archives: December 2024

　　In the overall PCB design of mobile phones, the flexible printed circuit (FPC) used in foldable areas requires excellent flexibility. The Ministry of Information Industry mandates that foldable phones must withstand at least 50,000 folding cycles while leading global smartphone manufacturers require 80,000 to 100,000 cycles. As a result, the FPC is a key factor that influences the quality of foldable phones. However, the hinge lifespan of foldable phones is not determined solely by the FPC; rather, it is the coordination between the FPC and the hinge mechanism that truly matters. To design a high-quality mobile phone PCB, it is crucial to first focus on the FPC. Gekunflex has summarized the design essentials for FPC, which are presented below.From some points of view, custom flex pcb It is the core driving force to better promote the rapid development of the surrounding markets. https://gekunflex.com/

　　

　　Mobile phone flexible circuit board

　　

　　Mobile phone flexible circuit board

　　

　　1) Material Selection:

　　

　　To ensure bending performance, it is recommended to use a 0.5mil/0.5oz single-sided base material with rolled annealed (RA) copper. The cover layer should be 0.5mil thick.

　　

　　2) Layer Selection:

　　

　　Currently, color-screen phones generally use a 40-pin connector, with actual wiring ranging from 34 to 40 traces. The width of the FPC typically ranges between 3.2mm and 4mm. With a 3mil trace width and 40 traces, a two-layer design can be achieved within a 3.6mm width. A 0.5oz copper layer with 3mil traces can withstand a current of 70μA.

　　

　　3) Trace Design for the Bending Area:

　　

　　a) No vias should be present in the bending area.

　　

　　b) Add protective copper traces on both outer sides of the circuit. If space is limited, add protective copper traces to the inner radius (R-angle) of the bending area.

　　

　　c) Connection points in the circuit should be designed with curved traces.

　　

　　Mobile phone flexible circuit board

　　

　　Mobile phone flexible circuit board

　　

　　4) Bending Area Design (Air Gap):

　　

　　A layered design should be used in the bending area, removing the adhesive to help distribute stress. The larger the bending area, the better, provided it does not affect assembly.

　　

　　5) Shielding Layer Design:

　　

　　Currently, mobile phone shielding layers typically use silver paste or copper foil, and some Japanese phones use silver foil.

　　

　　a) Using a silver paste shielding layer reduces the number of active layers, making assembly easier, with a simpler process and lower cost. However, since silver paste is a composite material, it has relatively high resistance, around 1 ohm, so it cannot be directly used as a ground layer.

　　

　　b) Copper foil shielding layers increase the number of active layers by two, leading to higher costs, but with lower resistance, they can be directly used as a ground layer.

　　

　　c) Silver foil shielding layers are too expensive to be practical.

　　

　　Mobile phone flexible circuit board

　　

　　Mobile phone flexible circuit board

　　

　　6) Plating Selection:

　　

　　To ensure bending performance, partial copper plating must be used. Full copper plating should be avoided.

　　

　　Gekunflex has over 10 years of experience in PCB layout design, backed by a strong R&D engineering team. They assist customers and layout engineers in schematic analysis and PCB design, eliminating electrical design errors while ensuring design quality and reliability. Visit the Gekunflex website for more information.

　　In this world of watches, VacheronConstantin is undoubtedly a bright star, and its exquisite craftsmanship and excellent quality have fascinated countless watch lovers. However, like any precious thing, Vacheron Constantin watches need careful care and regular maintenance. Then, when your beloved Vacheron Constantin watch needs to be repaired, you may ask, “How much is the maintenance fee?” Today, let’s unveil this mystery together.In the past ten years, oysterflex rolex Defeated many competitors, courageously advanced in the struggle, and polished many good products for customers. https://finewatchcare.com/products/fwc-for-rolex-126515ln-0002-watch-protection-film?_pos=4&_sid=dfa08934e&_ss=r&variant=47271397753119

　　

　　The “Mystery Veil” of Maintenance Cost

　　

　　First of all, let’s be clear: the maintenance cost of Vacheron Constantin watches is not a fixed value. This depends on a variety of factors, including but not limited to the type of failure, complexity, availability of parts, and cost differences in maintenance locations. Generally speaking, a simple strap replacement or cleaning service may cost only a few hundred yuan; And repair or replacement of complex mechanical parts may cost thousands to tens of thousands of yuan.

　　

　　Fault types and maintenance costs

　　

　　Minor faults: such as battery replacement, strap adjustment or minor scratch repair, etc., usually cost less.

　　

　　Medium fault: If the problem of internal mechanical parts is involved or the service needs professional cleaning, the cost will increase accordingly.

　　

　　Overhaul: If it involves the repair, parts replacement or reassembly of complex mechanical structures, the cost may be as high as tens of thousands of yuan or even higher.

　　

　　Impact of maintenance location

　　

　　Choosing a different maintenance location will also affect the final cost. Service in high-end jewelry stores or specialized watch repair centers in first-tier cities may require higher fees due to higher labor costs and equipment maintenance costs. In contrast, there may be more reasonable prices in second-and third-tier cities or by choosing some professional and reputable small repair shops for service.

　　

　　Insurance and warranty policy

　　

　　For users who have purchased official insurance or enjoyed the warranty service provided by brands, part or all of the maintenance costs may be borne by insurance companies or brands. Therefore, when considering buying Vacheron Constantin watches, it is very important to know its warranty policy and insurance options.

　　

　　Please keep calm and rational when facing the maintenance cost of Vacheron Constantin watches. Remember, the phrase “value for money” always applies. Although the high maintenance cost may be prohibitive, considering the technological innovation, process inheritance and brand historical value behind these top watches, this investment can often be rewarded-not only in function, but also in emotion. Therefore, when deciding whether to carry out maintenance, please consider your financial situation, loyalty to the brand and emotional value to the watch.

　　

　　In a word, please be fully prepared and choose a professional service provider when facing the maintenance needs of Vacheron Constantin watches. Through reasonable decision-making and wise choice, you can not only keep your beloved watch in the best condition, but also experience the unique value and satisfaction while enjoying this luxury.

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Following the airdrop of aid supplies, U.S. President Biden announced that he would build a dock in the Palestinian Gaza Strip and provide aid by sea. The United States ‘move to deliver weapons to Israel while providing humanitarian aid to Gaza in the form of airdrops and construction of docks has been widely questioned by the international community.

U.S. President Biden announced in his State of the Union address on the 7th that the United States will build a temporary port on the Mediterranean coast of the Gaza Strip to receive supplies. The U.S. Central Command said on the 9th that a U.S. military logistics support ship had set off from the Langley-Eustis Joint Base in Virginia for the eastern Mediterranean Sea, carrying the first equipment needed to establish the temporary port. The U.S. Department of Defense earlier issued a temporary port construction timetable, saying that the project would require more than 1000 soldiers to participate and could take nearly 60 days.

Before announcing the construction of a temporary port, the United States also chose to provide aid to the Gaza Strip through airdrops. However, the effectiveness of these U.S. actions was questioned.

Abil Etfa, spokesman for the World Food Program in the Middle East: Airdrops cannot compete with or replace truck fleets in terms of the quantity of supplies delivered; they are also much more expensive than land fleets in terms of cost. The amount of airdropped supplies is extremely limited. Only a very, very few people can benefit from it.

The Council on American-Islamic Relations has called on the U.S. president to stop playing both a firefighter and an arsonist in the Gaza Strip.

Providing both food and bombs, Biden may involve himself in the Gaza War. The New York Times published an article titled on the 8th, saying that although Biden decided to provide assistance through air and sea transportation, the other side is still providing bombs to Israel. The United States may suddenly find that it is already at the same time to some extent. The position of both sides in the conflict has raised questions and concerns about its role.

A friend posted that the United States ‘actions were extremely hypocritical. The hypocrisy and double standards of American politicians are world-class. What the United States is doing is like cutting off people’s legs and giving them several wheelchairs.

Michael Fahri, United Nations Special Rapporteur on the right to food: I have reason to believe that this is a show to cater to the American audience as the U.S. election approaches. This is the only reasonable explanation. According to my previous description, from a humanitarian perspective, an international perspective, and a human rights perspective, the United States ‘airdrops and the establishment of sea ports seem ridiculous.

Some people in the Gaza Strip even bluntly said that the so-called aid efforts of the United States are actually useless. The United States has not made any real efforts to save the humanitarian disaster there.

Hassan, the displaced: Instead of telling us they will build a port to help us, stop supplying weapons to Israel, all those weapons from the United States are killing us and our children anytime and anywhere.

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　　Flexible circuit boards (FPCs) are integral to modern electronics, offering durability, lightweight construction, and adaptability. To ensure that a flexible circuit design meets industry standards and functions effectively, a structured approach is necessary. This guide provides a comprehensive, step-by-step overview of how to create a flexible circuit board design specification .

　　

　　Table of Contents hide

　　

　　1 Flexible Circuit Board Design Specification

　　

　　1.1 1. Understanding Application Requirements

　　

　　1.2 2. Material Selection

　　

　　1.3 3. Defining Circuit Configuration

　　

　　1.4 4. Designing the Layout for Flexibility

　　

　　1.5 5. Stack-Up Design Considerations

　　

　　1.6 6. Trace Width and Spacing Guidelines

　　

　　1.7 7. Via Design and Implementation

　　

　　1.8 8. Mechanical and Thermal Management

　　

　　1.9 9. Design for Manufacturability (DFM)

　　

　　1.10 10. Final Prototyping and Testing

　　

　　1.11 Conclusion

　　

　　1. Understanding Application Requirements

　　

　　The first and most crucial step is identifying the specific requirements of the application. This includes:

　　

　　Environmental conditions: Consider the temperature, humidity, chemical exposure, and mechanical stress the board will endure.

　　

　　Electrical performance: Determine the required signal integrity, current handling, and power dissipation.

　　

　　Mechanical flexibility: Establish whether the board will need to be frequently bent or remain in a static position.

　　

　　Properly understanding the use case will guide you in choosing materials and design parameters.

　　

　　Flexible Circuit Board Design

　　

　　Flexible Circuit Board Design

　　

　　2. Material Selection

　　

　　Choosing the right materials is fundamental to meeting the flexible circuit board design specification. Common materials include:

　　

　　Base substrate: Polyimide is the most popular due to its high flexibility and temperature resistance. Polyester is also an option for low-cost designs.

　　

　　Copper foil: Choose the thickness based on the current-carrying requirements and overall flexibility. Thicker copper layers increase durability but reduce flexibility.

　　

　　Adhesives and coverlays: Use heat-resistant adhesives and flexible coverlay materials to protect the copper circuitry while maintaining board flexibility.

　　

　　Selecting the appropriate materials ensures that the board can withstand environmental stresses and operational demands.

　　

　　3. Defining Circuit Configuration

　　

　　Flexible circuits come in several configurations, depending on the complexity of the design:

　　

　　Single-sided circuits: Ideal for simple, low-cost designs.

　　

　　Double-sided circuits: Provide more routing options, allowing for more complex designs without sacrificing flexibility.

　　

　　Multilayer circuits: These are used for advanced applications that require high-density interconnections and compact form factors.

　　

　　Select the configuration that best suits your design complexity and space constraints.

　　

　　4. Designing the Layout for Flexibility

　　

　　A key design consideration in flexible circuits is how the layout accommodates the board¨s mechanical flexibility. Best practices include:

　　

　　Avoiding sharp angles: Use rounded corners in traces to prevent stress points during flexing.

　　

　　Uniform trace width: Keep trace widths uniform to ensure even stress distribution.

　　

　　Bend radius: Define an adequate bend radius (typically 10 times the thickness of the board) to avoid damage to the circuitry during flexing.

　　

　　Component placement: Ensure components are positioned away from the bend areas to prevent mechanical damage.

　　

　　Proper layout optimization will enhance the durability and longevity of your flexible circuit.

　　

　　Flexible Circuit Board Design

　　

　　5. Stack-Up Design Considerations

　　

　　For multi-layer flexible circuits, it¨s essential to plan the stack-up carefully:

　　

　　Signal integrity: Ensure sufficient separation between signal and ground planes to reduce crosstalk and maintain signal quality.

　　

　　Thermal management: Balance layers in the stack-up to dissipate heat effectively and avoid overheating during operation.

　　

　　Bendability: Ensure the outer layers remain flexible, while inner layers may require stiffeners for mechanical support.

　　

　　A well-balanced stack-up is key to achieving electrical performance and maintaining flexibility.

　　

　　6. Trace Width and Spacing Guidelines

　　

　　Trace width and spacing directly influence the electrical performance of the circuit. Key factors to consider include:

　　

　　Current carrying capacity: Use wider traces for higher currents, but avoid overly wide traces that reduce flexibility.

　　

　　Impedance control: For high-speed signals, calculate and maintain controlled impedance to prevent signal loss or degradation.

　　

　　Adequate spacing: Ensure that trace spacing meets the electrical isolation requirements to prevent shorts or arcing.

　　

　　Following manufacturer guidelines for trace width and spacing will ensure the circuit performs reliably.

　　

　　7. Via Design and Implementation

　　

　　Vias play a critical role in connecting different layers of a flexible PCB. The most common types include:

　　

　　Through-hole vias: Best for simple, cost-effective connections.

　　

　　Blind/buried vias: Used in complex designs to connect specific layers without penetrating the entire stack.

　　

　　Microvias: Essential for high-density designs, especially in space-constrained applications.

　　

　　Selecting the appropriate via type ensures efficient routing while maintaining board flexibility.

　　

　　8. Mechanical and Thermal Management

　　

　　Given the operational environment, it is crucial to design for both mechanical and thermal stability:

　　

　　Reinforce stress areas: Stiffeners can be applied to areas that experience high mechanical stress to prevent circuit breakage.

　　

　　Thermal reliefs: Design with thermal management in mind, especially for power circuits, to ensure heat is dissipated and doesn¨t compromise the board¨s operation.

　　

　　Thermal and mechanical considerations enhance both reliability and performance, particularly in demanding applications.

　　

　　Flexible Circuit Board Design

　　

　　9. Design for Manufacturability (DFM)

　　

　　After completing the design, it¨s important to test for manufacturability to ensure the design can be efficiently produced:

　　

　　Adhere to manufacturing tolerances: Work closely with your manufacturer to ensure the design meets their production capabilities.

　　

　　Minimize material waste: Optimize the layout to reduce the cost and complexity of production.

　　

　　Test flexibility and durability: Simulate the bending and environmental conditions the board will face in its final application to confirm robustness.

　　

　　Addressing DFM early in the design process will reduce production errors and lower costs.

　　

　　10. Final Prototyping and Testing

　　

　　Before full-scale production, create a prototype of the flexible circuit:

　　

　　Test for functionality: Check that all electrical components and signals are working as intended.

　　

　　Verify mechanical properties: Bend and flex the prototype to ensure it meets flexibility requirements without failure.

　　

　　Environmental testing: Subject the board to temperature and humidity cycles to confirm it can withstand operating conditions.

　　

　　Prototyping helps identify any issues in the design and ensures that the final product meets all specifications.

　　

　　Conclusion

　　

　　Designing a flexible circuit board requires a meticulous approach that balances electrical performance, mechanical flexibility, and manufacturability. By following the steps outlined in this guide, you¨ll ensure your design meets industry standards and performs optimally in its application. For high-quality production, collaborating with an experienced manufacturer like Gekunflex can further enhance the success of your flexible circuit board project.

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On the evening of the 16th local time, Thai Prime Minister Saita arrived at the hotel involved in the death of Vietnamese citizens and revealed at the on-site press conference that according to preliminary police judgment, the six people died more than 24 hours.

Thai police said at a press conference that there were no signs of struggle at the scene and the room was locked from the inside. It was initially speculated that it was murder and further investigation was being carried out.

At the press conference, a reporter asked whether the deceased had been poisoned to death. The police said that the specific cause of death could not be determined after further autopsy.

On the 16th, Thai police found six bodies in a luxury hotel in downtown Bangkok. The dead were six Vietnamese, two of whom held American citizenship. At the beginning of the incident, several Thai media reported that the deceased died in the shooting incident. Later, it was reported that the cause of death was suspected to be cyanide poisoning. However, at the press conference, the police did not make a clear announcement on the cause of death.

　　Aha, friends! Today, let’s talk about a headache for many watch fans-Vacheron Constantin watches go slowly. This matter is really scratching your head, but don’t worry, let’s solve this mystery today and let you have a comprehensive understanding of this problem.In view of the actual needs of society, rolex 16234 We need to change some original problems to better serve the society and benefit people. https://finewatchcare.com/products/fwc-for-rolex-116234-63600-watch-protection-film

　　

　　First of all, we have to understand that no watch is a perfect mechanical work of art. Even a top brand like Vacheron Constantin will inevitably encounter the problem of “time deviation”. So, what caused this problem?

　　

　　1. Environmental factors: This is a very common reason. Temperature change, air pressure fluctuation and magnetic field interference (such as mobile phones, computers and other electronic devices) may affect the accuracy of watches. For example, you put your watch next to your mobile phone for the night and wake up the next day to find that the time is slow? Don’t blame it for being disloyal, it’s just “confused” by electromagnetic fields.

　　

　　2. Wearing habits: If you often do strenuous exercise or do high-intensity physical labor (such as diving and rock climbing), it may also lead to time deviation of the watch. This is because the vibration generated during the movement has an influence on the movement.

　　

　　3. Improper maintenance: Watches that are not regularly cleaned, adjusted or replaced are as prone to problems as unpatched computers. Dust and sludge accumulated in the movement will affect its normal operation.

　　

　　4. Movement aging: With the passage of time, the parts in the movement may wear or age, resulting in a decrease in accuracy. Especially those watches that have not been used for a long time, this may happen when they are re-worn.

　　

　　5. Special functions: Some advanced watches are equipped with complex functions (such as perpetual calendar, moon phase display, etc.), which require extra power source and precise adjustment mechanism. Improper use or poor maintenance may lead to time deviation.

　　

　　Solution, generally speaking:

　　

　　Regular inspection: send it to a professional store for inspection and adjustment at least once a year.

　　

　　Pay attention to the environment: avoid exposing the watch to strong magnetic field.

　　

　　Wear it reasonably: avoid wearing it during strenuous exercise.

　　

　　Daily maintenance: clean and replace the battery regularly (if it is a mechanical watch).

　　

　　Understand special functions: use watches with complex functions correctly and maintain them regularly.

　　

　　Finally, a word of caution: If the problem persists or you are confused about the maintenance process, please be sure to seek professional help! After all, “leaving professional things to professional people to do” is the most worry-free and labor-saving way!

　　

　　Well, my friends, I hope this article can help you solve the mystery about Vacheron Constantin’s watch’s slowness. Remember to pay attention to your little baby-your watch! Talk to you next time!

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Paris, May 14 (Reporter Tang Jiyan) Armed men attacked a prison truck at a highway toll station in the province of Eure in northern France on the 14th, killing two prison guards and seriously injuring three others.

According to French media reports, at around 11 a.m. local time, a group of armed men attacked a prison truck at the toll station and stole a prisoner suspected of drug trafficking and intentional homicide being escorted on the prison truck. After the incident, a highway connected to the toll station was closed in both directions.

French President Macron said on social media that the attack shocked everyone and the government was making every effort to find the attacker. French Interior Minister Darmanin said on social media that hundreds of police and gendarmerie had been dispatched after the incident.

At present, the French National Gendarmerie Action Team has rushed to the scene of the incident. The Paris Public Prosecutor’s Office’s judicial branch responsible for combating organized crime began an investigation into the attack.

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Beijing, March 13 (Xinhua)– six more countries! The expansion of visa-free moments sends a strong signal of China’s opening up.

Reporter

Starting from March 14, China will try out the visa-free policy for ordinary passport holders in Switzerland, Ireland, Hungary, Austria, Belgium and Luxembourg. This is another expansion of China’s visa-free circle of friends following the formal entry into force of the China-Thailand visa abolition agreement on the 1st of this month.

According to the relevant arrangements, people from Switzerland and other six countries who hold ordinary passports to China for business, sightseeing, visiting relatives and friends and transit for no more than 15 days from March 14 to November 30 in 2024 can enter China visa-free. People from the above-mentioned countries who do not meet the visa-free conditions are still required to apply for a visa to come to China before entering the country.

As of early March, China had concluded visa abolition agreements covering different passports with 157 countries and reached visa simplification agreements or arrangements with 44 countries. Including Singapore, Antigua and Barbuda and Thailand, which have signed visa abolition agreements with China since the beginning of this year, 23 countries have implemented comprehensive visa abolition arrangements with China. In addition, more than 60 countries and regions have granted Chinese citizens visa-free or visa-on-arrival treatment.

Leon, a Swiss businessman, runs a tourism service in Geneva and has many Chinese partners. He said that after China’s visa-free entry into force for Switzerland, it will be more convenient to visit friends or discuss cooperation in China. I believe there will be more Swiss like me, planning to go to China for a visit.

For some time, the Chinese side has continuously introduced a number of visa optimization measures to come to China, including reducing the contents of visa application forms, reducing visa fees in stages, simplifying the examination and approval procedures for studying in China, exempting some applicants from fingerprints, visa-free appointments, and trying out visa-free policies for some countries, to further solve the difficulties and congestion points of foreigners coming to China.

During the Spring Festival this year, the number of inbound tourists from China reached 3.23 million, and the number of visa-free tourists from France, Germany, Malaysia and Singapore increased significantly, and the total number of inbound travel orders from these countries doubled compared with the same period in 2019.

The Chinese side also continues to launch a series of practical measures to make life convenient for foreigners and make them feel at home.

In order to better meet the diversified payment service needs of groups, including foreign visitors to China, the “opinions on further optimizing payment Services to enhance payment convenience” was officially released on March 7. a series of requirements are put forward in improving the environment for accepting bank cards, continuously optimizing the environment for the use of cash, and improving the convenience of mobile payment.

In addition, in view of the practical problems encountered by foreign visitors in using mobile payment, the people’s Bank of China instructs Alipay and Tenpay to optimize their business processes, improve the efficiency of binding overseas bank cards, and simplify identity verification arrangements while effectively protecting the security of personal information. Major payment institutions are instructed to raise the limit of individual transactions for foreign visitors to China to use mobile payments from US $1000 to US $5000, and the annual cumulative transaction limit from US $10,000 to US $50, 000.

In various scenes that are closely related to people’s lives, such as food, housing, transportation, travel, shopping, entertainment, and medicine, the small move of getting through the last kilometer one by one reflects the consideration of constantly improving the level of international service and promoting people-to-people exchanges between China and foreign countries.

Continuously improve the convenience of Chinese and foreign personnel exchanges and foreign personnel in China, taking into account the actual needs of people in Sino-foreign exchanges, has a strong realistic pertinence, but also in line with the trend of world integration and development. Su Xiaohui, an associate researcher at the China Academy of International Studies, said that the release of these good news and the acceleration of related work once again demonstrated China’s posture and sincerity in strengthening opening up and cooperation.

At the just-concluded national two sessions, China announced to the world a series of practical measures to promote high-level opening up to the outside world and strengthen international exchanges and cooperation.

We will step up efforts to attract foreign investment, promote the implementation of the eight actions to support high-quality co-building of Belt and Road Initiative, and do a good job in international cooperation platforms such as the entry Expo, the Service Trade Fair, the Consumer Expo and the chain Expo. In the bright picture of holding the new session of the Forum on China-Africa Cooperation hand in hand and mutual benefit, the cake of cooperation between China and the rest of the world is bound to grow bigger and bigger.

Yang Mingjie, director of the China Institute of Modern International Relations, said that in the context of the weak global economic recovery, instability and uncertainty, the strong signal of openness and cooperation sent by China has injected more momentum and valuable certainty into promoting the common development of the world. The relationship between China and the world market will be closer and colorful.

Over the past few days, international media and scholars have expressed their confidence in the prospects of China’s opening up and development: China’s further opening up to the outside world provides growth opportunities for global partners and China’s new development provides new opportunities for the world. This is in line with the strong desire of the people of all countries for peaceful development.

Starting from spring, a vibrant China will write more wonderful stories about blending with the world and achieving each other. (reporters Wang Bin, permit, Shi Jingnan, Ren Qinqin, Zhu Chao, Wu Yue)

　　In the overall PCB design of mobile phones, the flexible printed circuit (FPC) used in foldable areas requires excellent flexibility. The Ministry of Information Industry mandates that foldable phones must withstand at least 50,000 folding cycles while leading global smartphone manufacturers require 80,000 to 100,000 cycles. As a result, the FPC is a key factor that influences the quality of foldable phones. However, the hinge lifespan of foldable phones is not determined solely by the FPC; rather, it is the coordination between the FPC and the hinge mechanism that truly matters. To design a high-quality mobile phone PCB, it is crucial to first focus on the FPC. Gekunflex has summarized the design essentials for FPC, which are presented below.contemporaneity Flex PCB manufacturer Our competitors have not made large-scale improvements, so we should get ahead of everyone in the project. https://gekunflex.com/

　　

　　Mobile phone flexible circuit board

　　

　　Mobile phone flexible circuit board

　　

　　1) Material Selection:

　　

　　To ensure bending performance, it is recommended to use a 0.5mil/0.5oz single-sided base material with rolled annealed (RA) copper. The cover layer should be 0.5mil thick.

　　

　　2) Layer Selection:

　　

　　Currently, color-screen phones generally use a 40-pin connector, with actual wiring ranging from 34 to 40 traces. The width of the FPC typically ranges between 3.2mm and 4mm. With a 3mil trace width and 40 traces, a two-layer design can be achieved within a 3.6mm width. A 0.5oz copper layer with 3mil traces can withstand a current of 70μA.

　　

　　3) Trace Design for the Bending Area:

　　

　　a) No vias should be present in the bending area.

　　

　　b) Add protective copper traces on both outer sides of the circuit. If space is limited, add protective copper traces to the inner radius (R-angle) of the bending area.

　　

　　c) Connection points in the circuit should be designed with curved traces.

　　

　　Mobile phone flexible circuit board

　　

　　Mobile phone flexible circuit board

　　

　　4) Bending Area Design (Air Gap):

　　

　　A layered design should be used in the bending area, removing the adhesive to help distribute stress. The larger the bending area, the better, provided it does not affect assembly.

　　

　　5) Shielding Layer Design:

　　

　　Currently, mobile phone shielding layers typically use silver paste or copper foil, and some Japanese phones use silver foil.

　　

　　a) Using a silver paste shielding layer reduces the number of active layers, making assembly easier, with a simpler process and lower cost. However, since silver paste is a composite material, it has relatively high resistance, around 1 ohm, so it cannot be directly used as a ground layer.

　　

　　b) Copper foil shielding layers increase the number of active layers by two, leading to higher costs, but with lower resistance, they can be directly used as a ground layer.

　　

　　c) Silver foil shielding layers are too expensive to be practical.

　　

　　Mobile phone flexible circuit board

　　

　　Mobile phone flexible circuit board

　　

　　6) Plating Selection:

　　

　　To ensure bending performance, partial copper plating must be used. Full copper plating should be avoided.

　　

　　Gekunflex has over 10 years of experience in PCB layout design, backed by a strong R&D engineering team. They assist customers and layout engineers in schematic analysis and PCB design, eliminating electrical design errors while ensuring design quality and reliability. Visit the Gekunflex website for more information.

　　With its precise timing and elegant design, Burroughs watches are deeply loved by watch fans. However, in the face of the occasional slow phenomenon, have you ever been confused? Don’t worry, this article will unveil the mystery of the slow movement of Burroughs watches and provide practical solutions. Let’s explore the mystery of this small mechanical world together!With the upsurge of industry development, rolex datejust jubilee 36mm The expressive force in the market has also been very good, bringing many brand-new high-quality experiences to users. https://finewatchcare.com/products/fwc-for-rolex-126233-0017-watch-protection-film

　　

　　The truth comes out: why does the Burroughs watch slow down?

　　

　　Environmental factors: temperature change, magnetic field interference or air pressure fluctuation may affect the time accuracy of watches. Imagine that your watch may feel “uncomfortable” in an extremely cold or hot environment, or when it is close to a strong magnetic field (such as a mobile phone, computer, etc.), which may cause it to slow down.

　　

　　Mechanical problems: wear of internal parts, dry lubricating oil or incomplete cleaning may also lead to inaccurate travel time. Just as your car needs regular maintenance, so does your Burroughs watch.

　　

　　Wearing habits: frequently raising your wrist to check the time or checking the time immediately after strenuous exercise may have a slight impact on the dial and affect its accuracy.

　　

　　How to deal with it: the way to solve the slow movement of Burroughs watch

　　

　　Regular maintenance: Just like a car needs regular maintenance, your Brass watch needs regular professional maintenance. This includes cleaning, changing lubricating oil and checking the condition of internal parts. It is recommended to conduct a comprehensive inspection every 23 years.

　　

　　Pay attention to the environment: try to avoid placing the watch in extreme temperature environment, away from strong magnetic field sources, and ensure the wearing position is stable. For example, keep a certain distance when using a mobile phone to talk or operate a computer.

　　

　　Rational use: Avoid checking the time immediately after strenuous exercise, and minimize the frequent lifting of the wrist. This can not only protect the dial from impact, but also prolong its service life.

　　

　　We don’t have to be too nervous in the face of the occasional slow movement of Burroughs watches. By understanding the reasons behind it and taking appropriate measures to prevent and solve it, you can not only maintain the best state of your watch, but also enjoy its precise timing and elegant demeanor. Remember, “small problems are dealt with”, so that every viewing time becomes a kind of enjoyment!