Metal domes are widely used in various tactile switch applications, providing a satisfying tactile feedback when pressed. One intriguing aspect of metal domes is the distinct sound they produce upon actuation. Some metal domes exhibit a crisp and pronounced “snap” sound, while others have a muffled or subdued tone. Have you ever wondered what factors contribute to these differences in sound? In this blog, we will delve into the science behind the auditory feedback of metal domes and explore the factors that influence the sound they produce.

 What is Click Ratio?

The click ratio is a crucial parameter that determines the auditory feedback of metal domes. It is defined as the difference in force between the compression peak force (CP) and the compression low force (CL) states, divided by the pre-collapse force and multiplied by 100%, that is click ratio=(CP-CL)/CP*100%. In simpler terms, it measures the amount of force required to collapse the dome and create a tactile click. Typically, the click ratio of metal domes is around 50% with a tolerance of ±15%.

The click ratio directly affects the sound produced by metal domes. When the click ratio is higher, approaching the upper limit of the tolerance range, the resulting sound is crisper and more pronounced. On the other hand, a lower click ratio leads to a muffled or softer sound. This correlation between click ratio and sound quality is a result of the specific force distribution and movement of the metal dome during actuation.

 Considerations for Optimal Click Ratio

While a higher click ratio may result in a more satisfying sound, it is essential to strike a balance to ensure optimal performance and longevity of the metal domes. Exceeding a click ratio of 70% is generally not recommended for two primary reasons:

1. Rebound Force

When the click ratio is excessively high, the rebound force, or the force exerted by the metal dome when returning to its original shape, becomes lower. This can lead to a phenomenon known as “dome sinking” over time, where the dome fails to fully regain its original shape after multiple actuations. Dome sinking can adversely impact the tactile feedback and the overall performance of the switch.

 2. Lifespan

Metal domes are designed to withstand numerous actuations without experiencing significant degradation in performance. However, excessively high click ratios can put additional strain on the domes, potentially reducing their lifespan. The repeated stress on the metal dome can lead to fatigue and premature failure, compromising the reliability of the switch.

(Life span tester)

 3. Optimizing Sound and Performance

Achieving the perfect balance between sound quality and performance requires careful consideration of the click ratio. Manufacturers strive to optimize the click ratio within the acceptable tolerance range to ensure a crisp and satisfying sound while maintaining the long-term reliability of the metal domes. This delicate balance ensures a tactile switch that not only provides an enjoyable user experience but also meets the rigorous demands of various industries.

 From above, we know the “snap” sound produced when pressing metal domes is influenced by the click ratio, which determines the force distribution and movement of the domes during actuation. By carefully optimizing the click ratio within an acceptable range, manufacturers can achieve a balance between sound quality, switch performance, and longevity. This delicate balance ensures that metal domes not only provide an enjoyable tactile experience but also meet the demands of diverse applications in industries such as electronics, automotive, and consumer goods.

Best Technology specialize in the production, sales and service of metal domes, dome array, light guide film and OCA products. The metal dome range includes four-legged, triangle, round and oblong types which can satisfy most requirements. Freely contact us if you have any projects that need metal domes.

The metal dome is made of stainless steel and is the momentary switch contact. A metal dome can be combined with a PCB and flex circuit to become a normally open tactile switch. Metal domes generally come in different shapes and classifications, but it depends on your product to choose the right application. First, let’s introduce the classification of metal domes:

If you are not sure which metal dome to choose to match your product, you can find the metal dome you need according to the type introduction below.

In general, we divide metal domes into three types, mainly by electroplating—nickel plating, silver plating, and gold plating. The purpose of metal dome plating is to reduce the resistance of the contact surface and increase the conductivity of the dome. Generally, the conductivity of stainless steel is about 10?. Nickel-plated resistance is less than 1 ohm. Silver plating, gold plating effect is better. But gold plating can significantly increase the cost of the product. We also recommend that you choose a silver-plated metal dome, which can maintain the cost of the product while increasing the effect of the product.

Overall, the silver-plated metal dome has good physical properties and can be called the best dome. The silver-plated metal dome is stable and corrosion-resistant in use, which can increase the service life of the dome. After testing, the service life of the silver-plated metal dome can reach more than 100,000 times. Of course, the choice of dome still depends on your actual needs to choose the appropriate dome type.

Let’s introduce the specific performance of the metal circle:

When using a membrane switch, different operating forces will give the inner metal dome a different operating feel. The lifespan of a membrane switch depends primarily on the metal dome inside. Then let’s introduce the performance of the metal dome in detail. The main performance of the metal dome is long life, good operating feel, and good resilience, heat resistance and cold resistance.

In a membrane switch, the metal dome is one of the core components of the key hub in the membrane switch. It controls the power on and off of the switch, and the main function of the membrane switch is to realize the disconnection and passage of overcurrent. In the early days, before there was no membrane switch, the metal dome used this dome to control the passage and disconnection of the current of the entire switch. If there is no such dome, the entire switch is equivalent to an empty shell, and the functions it wants to achieve cannot be used.

The metal dome is in the membrane switch, and the switch is turned on by lightly pressing the switch button, and the switch is turned off when the hand is released. The force of the metal dome mainly realizes its internal structure – this series of functions. The only thing that works is the internal metal shrapnel. The service life of this shrapnel alone can generally reach 1 million times. However, with the frequent use of switches, the current number of uses of touch switches can only reach 100,000 times.

Best Technology specializes in the production of metal domes, and has been in the metal dome industry for more than 20 years. We have rich experience in the design and production of metal domes. Best’s products can be used in a variety of applications and can be produced according to customers’ designs.

Metal dome arrays are widely used in electronic devices, providing tactile feedback and reliable switch activation. However, there are instances where the metal dome array may not secure firmly as desired. In this article, we will discuss the reasons behind this issue and analyze the factors that contribute to it. 

1. High Force and Stroke Requirements

One reason for the metal dome array not being firmly secured is the high force and stroke requirements specified by the customer. In certain cases, customers may require metal domes with high force and stroke, such as 12.2mm four-leg domes with a force of 400g and a stroke of 0.60mm or above. These requirements can pose challenges in achieving a strong adhesive bond due to the nature of the materials involved.

2. Inadequate or Excessive Adhesive Tape

The adhesive tape used for the metal dome array may not be properly aligned with the customer’s drawings and specifications. It is crucial to ensure that an appropriate distance of at least 2.0mm is maintained between the dome array and the adhesive tape. Insufficient or excessive adhesive tape can result in a weaker bond and compromise the firmness of attachment.

3. Variations in Material Viscosity

Each batch of materials used for the metal dome array may have variations in viscosity tolerance. If the viscosity tolerance of the materials goes to the lower limit and combined with the factors mentioned earlier, it can affect the firmness of the adhesive bond. Lower viscosity materials may not provide the desired level of adhesion, leading to a less secure attachment. To address these issues, certain steps can be taken:

• Consider using a more viscous adhesive tape, such as 3M, for metal dome   

arrays with special specifications. This can help improve the adhesion strength and ensure a firmer attachment.

• Ensure that the adhesive tape is applied correctly and in right quantity to

maintain the recommended distance between the dome array and the tape.

• Monitor and control the viscosity tolerance of materials to ensure consistency in adhesive performance across different batches.

It’s important to note that such problems are uncommon with standard metal dome arrays. However, for specific requirements and higher force/stroke specifications, using stronger adhesive materials and following precise application techniques can help mitigate the issue. It’s essential to apply the adhesive tape accurately in one attempt since it may not be easy to reposition or remove after sticking. 

FAQsHere are some frequently asked questions related to the issue of metal dome arrays not securing firmly: 

Q1: How can I ensure a firm attachment of metal dome arrays in my product design?

A1: To ensure a firm attachment of metal dome arrays, consider the following: 

1) Use adhesive tapes that are suitable for the specific force and stroke requirements.

2) Properly align the adhesive tape with the dome array according to the recommended distance.

3) Optimize the viscosity of the adhesive material to maintain consistent adhesion across batches.

4) Follow precise application techniques and ensure accurate positioning during the attachment process.

 Q2: What should I do if the metal dome array does not secure firmly in my product?

A2: If you encounter issues with the firm attachment of metal dome arrays, you can try the following solutions: 

Evaluate the force and stroke requirements and consider using stronger adhesive materials.

Double-check the alignment and quantity of adhesive tape to ensure it meets the recommended specifications.

Consult with the manufacturer or supplier for guidance on resolving the issue.By considering these factors and taking appropriate measures, you can enhance the firmness of attachment for metal dome arrays and ensure their reliable performance in your product. 

Q3: Are there any alternative methods to improve the firmness of attachment for metal dome arrays?

A3: Yes, there are alternative methods you can explore to improve the firmness of attachment for metal dome arrays: 

Consider using mechanical fasteners in conjunction with adhesive bonding for added stability.

Explore the use of specialized bonding techniques, such as ultrasonic welding or soldering, depending on the specific application requirements.

Collaborate with the manufacturer or supplier to explore customized solutions tailored to your specific needs.

It’s important to evaluate the feasibility and suitability of alternative methods based on the specific application and requirements of your product. 

Conclusion

By considering the recommended solutions, exploring alternative methods, and collaborating with experts, you can improve the firmness of attachment for metal dome arrays, ensuring optimal performance in your electronic devices. If you still have some confuses, welcome to contact us at sales@metal-domes.com.

Metal domes play a critical role in various electronic devices, providing tactile feedback and switch activation. The longevity and durability of these components are essential considerations for manufacturers and product designers. To ensure optimal performance and longevity, it is crucial to understand the factors that can affect the lifetime of metal domes. In this article, we will explore these factors in detail and provide insights into maintaining the longevity and reliability of metal domes.

Material Quality

The quality of the materials used in manufacturing metal domes is a fundamental factor influencing their lifespan. High-quality materials, such as stainless steel or nickel-plated stainless steel, offer exceptional resistance to corrosion, wear, and environmental factors. By using superior materials, manufacturers can ensure that the metal domes withstand the test of time, preventing premature failure or degradation.

(Life tester) 

Environmental Conditions

The environmental conditions in which metal domes are used have a significant impact on their lifespan. Extreme temperatures, high humidity, exposure to chemicals or solvents, and mechanical stress can all affect the performance and durability of metal domes. To mitigate these risks, it is essential to consider the specific environmental conditions and select metal dome materials and coatings that can withstand these challenges. Proper protection against environmental factors ensures that the metal domes remain functional and reliable over an extended period. 

Actuation Force and Cycling

The actuation force and cycling of metal domes also play a crucial role in determining their lifespan. Actuation force refers to the pressure required to activate the metal dome and register a keystroke. Excessive or inconsistent actuation force can lead to fatigue and deformation of the metal dome, reducing its lifespan. Similarly, frequent cycling or excessive use can cause mechanical stress and wear, potentially resulting in the failure of the metal dome over time. Striking the right balance between precision and longevity is essential to maximize the lifespan of metal domes.

(Force tester)

 Coating and Surface Treatment

To enhance performance and durability, metal domes often undergo various surface treatments and coatings. These coatings provide protection against abrasion, wear, and environmental factors. However, the quality and integrity of the coating are crucial in determining the lifespan of the metal dome. A high-quality coating effectively shields the metal dome from corrosion, moisture, and other potential sources of damage, prolonging its lifespan and preserving its functionality.

Operating Conditions and Maintenance

The operating conditions and maintenance practices employed for electronic devices significantly impact the lifespan of metal domes. Proper usage, adherence to recommended operating parameters, and regular maintenance are vital to prolong their longevity. Applying excessive force or subjecting the metal dome to impacts, maintaining a clean operating environment free from contaminants, and conducting routine inspections can contribute to the prolonged lifespan of metal domes. 

Design and Manufacturing Quality

The design and manufacturing quality of the overall product or device incorporating metal domes play a crucial role in their lifespan. Proper placement, alignment, and integration of metal domes within the device are essential to ensure optimal performance and longevity. Manufacturing processes that adhere to strict quality control standards, including appropriate handling and installation of metal domes, reduce the risk of premature failure and contribute to their extended lifespan.

FAQs

Here are some frequently asked questions about the factors affecting the lifetime of metal domes: 

Q1: Can additional protective measures extend the lifespan of metal domes?

A1: Yes, additional protective measures such as conformal coatings, encapsulation, or sealing can be applied to metal domes to enhance their resistance to environmental factors and increase their lifespan. These protective measures provide an extra layer of defense against moisture, chemicals, and physical damage, ensuring the longevity and reliability of the metal domes. 

Q2: Are metal domes suitable for outdoor applications?

A2: Metal domes can be suitable for outdoor applications depending on the material used and proper protective measures. Stainless steel or coated metal domes with weather-resistant coatings are more resilient to environmental factors such as temperature fluctuations and moisture. Additionally, proper sealing and protection against dust and debris can further enhance their suitability for outdoor use. 

Q3: How can I ensure the longevity of metal domes in my product design?

A3: To ensure the longevity of metal domes in your product design, consider the following: Choose high-quality materials with excellent resistance to corrosion and wear.Select appropriate coatings or surface treatments to enhance durability.Design the product with proper alignment and integration of metal domes.Consider the operating conditions and implement preventive measures to minimize stress and wear.Follow recommended maintenance practices and perform routine inspections.By incorporating these considerations into your product design, you can maximize the lifespan and reliability of metal domes. 

Q4: Can I reuse metal domes in case of product repairs or upgrades?

A4: It is generally not recommended to reuse metal domes once they have been installed in a product. During the removal process, metal domes can experience deformation or damage, which may affect their performance and reliability. It is best to replace metal domes with new ones to ensure optimal functioning and longevity of the product. 

Q5: Are there any industry standards or certifications for metal domes?

A5: Yes, there are industry standards and certifications that ensure the quality and reliability of metal domes. For example, ISO 9001 certification ensures adherence to quality management standards. Additionally, manufacturers may comply with specific industry standards, such as RoHS (Restriction of Hazardous Substances) or REACH (Registration, Evaluation, Authorization, and Restriction of Chemicals), to meet environmental and safety regulations. 

The lifespan of metal domes is influenced by various factors, by understanding these factors and implementing appropriate measures, we can ensure the longevity and reliability of metal domes in their end-applications. Best Technology specializes in the production, sales and service of metal domes, dome array, light guide film and OCA products, you are welcome to contact us at any time for any questions.

If you want to understand the quality inspection method of metal domes, you must first know the factors that affect the quality of metal domes.

1. Lifespan of the metal dome

The service life of a metal dome is a key factor in evaluating its quality. The life expectancy of the metal dome ensures the durability and longevity of the dome, making it suitable for prolonged use without premature failure. Best is based on designing and manufacturing metal domes that exceed required lifetime specifications, providing customers with reliable components that can withstand repeated start-ups.

The force of the metal dome

2. The force bearing capacity of the metal dome refers to the ability to withstand the driving force without deformation or failure. Ensuring that the metal dome can consistently deliver the force needed for the electronics to function properly is critical. We formulate the driving force according to the drawing provided by the customer. Quality testing allows the assessment of the force-bearing capacity of metal domes to ensure that they meet the required standards.

3. Resistance of the metal dome

The electrical resistance of a metal dome is a key factor in determining its electrical performance. The metal dome ensures electrical conductivity and reliable electrical contact depending on the material and plating used. For example: stainless steel metal domes typically have a contact resistance of less than 10 ohms, while nickel-, silver-, or gold-plated domes typically have a contact resistance of less than 1 ohm.

4. The appearance of the metal dome

The sleek appearance of the metal dome contributes to its overall quality and customer satisfaction. During the quality inspection, the dome is thoroughly inspected for some stains such as burrs. This inspection may affect that the metal dome will not be punctured and dirty during subsequent use. By maintaining a high visual standard, Best was able to ensure that the metal dome met client expectations and delivered a polished end product.

Then according to the above factors that affect the quality of metal domes, we have also developed corresponding quality inspection methods for these, mainly starting from these aspects:

1. Metal dome life: mainly through the life tester to detect whether the life of the shrapnel meets the requirements. The metal dome life tester mainly simulates the real use environment and detects the number of times the metal dome is used, which can ensure that the metal dome has a sufficient service life and meets the expected quality standards.

2. Strength test: Use a strength tester to detect the strength of the shrapnel. Generally, the strength range of the shrapnel is ±30G, which is normal. Measure the force required to actuate the metal dome and verify that it is acceptable. Force testing confirms that the metal domes can withstand the required actuation forces without deforming or failing, ensuring reliability and consistent performance.

3. Appearance inspection: whether there is dust, oil stains, stains on it. The inspectors have gone through skilled inspection and carefully inspected each metal dome to ensure that the appearance of the metal dome remains smooth and clean.

4. Contact resistance test: According to the material and electroplating of the metal dome, conduct a proper test, and the resistance of different materials is also different.

Best Technology has rich manufacturing experience both in the production and testing of metal domes. If you have needs for metal domes, you can send us an email to consult us in detail, or you can follow our website to learn more about the materials and production of metal domes.

Sometimes customers sent us such request that can you make the different shapes and sizes metal domes on a dome array? Because in the market, most of metal domes on a dome array are with same shape and same specifications, and rarely assembled with different shapes. So can metal domes with different specifications on a dome array?

The answer is YES, different shapes (four legs, triangle, round and oblong dome) and diameters of metal dome can be done on a dome array in Best Technology. Although the process will be a little bit complex, we could do in accordance with the customer’s request. Do you know why customer ask for such a dome array? Or what advantages we can get if use such dome array? Herein, we will explain for you, welcome to keep reading.

Why need a dome array with different size and shapes?

Generally, all the dome arrays are with same size and shapes. However, there are some special situations that customers need to use different specifications metal dome on a dome array, for example:

1. It may be the design problem of the customer’s circuit board, so a special dome array is needed to make the board work properly.

2. Different keys have different requirements in their end-applications, only using different domes could meet the requests. For instance, some keys require higher force, some keys require good click feeling.

3. The size of the keys is different, so we have to use different diameters of the metal domes, such dome arrays in keypad.

 Advantages of Using Different Shapes and Sizes

By incorporating metal domes with different shapes and sizes into dome arrays, there are several advantages we can obtain from it.

• Improved User Experience

By using metal domes of varying shapes and sizes, designers can create dome arrays that offer unique tactile experiences. This can enhance user satisfaction and make the interface more engaging.

• Design Flexibility

Different shapes and sizes of metal domes provide designers with increased flexibility in creating aesthetically pleasing and functional dome arrays. The ability to customize the shape allows for greater design freedom, enabling unique and visually appealing interfaces.

• Enhanced Aesthetics

Custom-shaped metal domes can add a touch of elegance and uniqueness to the overall design of the device. They can contribute to the visual appeal of the interface and create a more premium look and feel. 

Considerations for Different Shapes and Sizes

While incorporating metal domes with different shapes and sizes into dome arrays offers design versatility, there are few factors need to be considered:

• Functionality

The chosen shape and size of metal domes should align with the intended functionality of the device. The tactile feedback and actuation force should meet the desired user experience and operational requirements.

• Actuation Force

Different shapes and sizes of metal domes will influence the actuation force required to trigger the switch. Designers need to ensure that the actuation force remains within acceptable ranges for the intended application.

• Tactile Feedback

The shape and size of metal domes directly impact the tactile feedback experienced by the user. Designers should consider the desired tactile sensation and choose the appropriate domes accordingly.

Although this kind of metal dome array can be made, the process of making is a little bit complicated. It needs to make two or more laminate (assembly) fixtures and assemble them twice or more based on the dome types. So, the assembly time is twice or more as much as that of a single shape and specification, hence the price will also be higher. It is recommended if there is no special requirement, it is better to use the metal domes with the same shape and size.

Or, you can find an experienced metal dome & dome array supplier that can supply high-quality products. Best Technology has a dynamic R&D team, an experienced engineering team and excellent management personnel with 20 years of experience. We are so confident that we can provide you best product and satisfied service!!!

Many customers have doubts about the pricing of single metal domes and single key dome arrays. Evaluating the price of dome arrays involves considering various factors. Let’s explore the key aspects to consider when evaluating the price of dome arrays. 

Single Metal Dome

To determine the unit price of a single metal dome, the following information should be considered:

1. Shape: The shape of the dome, such as circular, square, or custom shapes, affects the manufacturing process and cost.

2. Material: The type of material used for the dome, such as stainless steel or nickel alloy, impacts the price.

3. Width and Thickness: The dimensions of the metal dome, including its width and thickness, contribute to the cost calculation. 

Single Key Dome Array

Evaluating the price of a single key dome array requires additional considerations:

1. Array Size: The overall size of the dome array affects the material usage and manufacturing complexity, which influences the price.

2. Dome Specifications: The specifications of individual metal domes within the array, including their shape, diameter, and material, impact the cost.

3. Layout: The layout of the dome array is crucial. Customized layouts, such as non-standard key positions or specific shapes, often incur higher costs compared to standard layouts.

 Additionally, the order quantity plays a significant role in determining the price:

• Larger Order Quantities: Ordering dome arrays in larger quantities generally results in lower unit prices due to economies of scale.
• Smaller Order Quantities: Conversely, smaller quantities may incur higher costs due to setup and manufacturing overheads associated with smaller production runs.

Key points affect your price of dome array

When contemplating the procurement of dome arrays, it is imperative to bear in mind the following key factors:

1.Shape and Size: Non-standard shapes and larger sizes may lead to higher

prices due to increased complexity and material usage.

2.Material Selection: Different materials have varying price points and

performance characteristics. Selecting the appropriate material based on your requirements will impact the final price.

3.Quantity: Order quantity affects the price. Bulk orders generally enjoy lower unit prices, while smaller orders may have higher costs. 

4. Custom Layouts: Customizing the layout of dome arrays, such as non-standard key positions or specific shapes, can incur additional costs due to engineering design and manufacturing adjustments.

5. Surface treatment: Apply surface treatment also will affect the price of the dome array in certain way. At present, stainless steel, nickel and gold are available in Best Technology.

 How to choose a reliable supplier?

When choosing a supplier, consider the following:

 1. Quality and Reliability: Dome arrays play a critical role in many applications. Ensure that the supplier offers high-quality and reliable dome arrays that meet your specifications. 

2. Manufacturing Capability: Assess the supplier’s manufacturing capability and capacity to ensure they can meet your required quantity and adapt to changing demands. 

3. Customer Service: Good customer service is essential for a long-term partnership. Choose a supplier that provides excellent support and timely responsiveness to your inquiries. 

In conclusion, evaluating the price of dome arrays involves considering factors such as shape, size, material, layout customization, and order quantity. By carefully assessing these aspects and selecting a reliable supplier, you can make informed decisions that balance cost-effectiveness with your specific requirements.

The metal dome is made of metal material. The initial state of the dome is convex upwards, and when the operator presses it hard, it is concave downwards. This kind of metal dome is called a metal dome switch by many people. Now the metal dome is widely used, although the touch screen replaces the dome switch a little bit, but the dome switch is more stable in use. Metal domes are mainly used in: for push button switches, membrane switches, keyboards, metal dome switches and shrapnel.

The process of cleaning the metal dome during the production process is very critical, and it will even affect the quality of the metal dome. Why do you say that? Because if the metal dome is not cleaned, it will affect the conduction of the circuit board, which is a functional problem, and the dome cannot be used normally.

First of all, I will take you to understand the cleaning process of the metal dome. The cleaning of the dome mainly relies on ultrasonic waves and uses special chemical reagents for cleaning. The cleaning process takes about an hour or so. After cleaning, it needs to be dried, and it takes about an hour to dry. If not cleaned thoroughly, lamination may develop, causing rust and stains. Therefore, it is necessary to constantly observe and adjust during the cleaning process to avoid the phenomenon of stacking. After drying, the metal domes will be manually screened, and the domes that are not cleaned thoroughly will be selected to avoid affecting other domes.

Our company has specialized in the production of metal domes for more than 20 years, and there was no cleaning problem in previous orders. This is mainly because Best Technology has been strictly controlling product quality in terms of cleaning and quality inspection to prevent products from affecting the company’s reputation, so we have never received any complaints about the quality of the dome. If you are reading this article, if you are interested in our products, you can continue to pay attention to our website, we will continue to publish news about metal domes, if you are interested in our products, you can also send us Your needs, we will reply your email immediately.

Metal domes can be used in all types of environments and these keyboards can also be customized according to the needs of the user. Metal domes, usually made of stainless steel, are momentary switch contacts that provide a tactile feel or “snap” when pressed. Connect the two circuit board traces together under the metal dome keyboard. The metal dome also exhibits excellent tactile feedback in membrane switches, while also backlighting the metal keypad.

How Membrane Switches Work

Here’s how the metal dome works in a membrane switch: The metal dome switch is a formed stainless steel piece that provides positive tactile feedback to the user when compressed. When the key is not pressed, the membrane switch is in the normally open state, its upper and lower contacts are disconnected, and the isolation layer isolates the upper and lower lines; when the key is pressed, the upper contact point of the circuit deforms downward and merges with the lower circuit, so that The circuit is turned on. When the key is pressed, it folds the dome, connecting the two circuit traces and completing the connection to enter characters.

Advantages of metal domes

Metal domes are preferred for electronic keyboards because of their resilience and excellent tactile feedback in applications that respond quickly. The application of the metal dome in the keyboard allows the user to immediately know that the keyboard is receiving their actions because they can feel the response of the metal dome switch. Metal domes also have a longer lifespan specification in electronic keyboards, not least because of their reliability of over 5 million cycles. Metal dome switches can be plated with nickel, silver or gold. The automotive industry has particularly chosen to use metal dome keyboards because the integrated metal dome ensures a long lifespan and excellent tactile feel.

Design features of metal domes

The design and production process of the metal dome switch in the keyboard, you can customize the size, shape, tripping force, rebound force or travel, with legs or with holes, we will all according to your design, drawings, samples for your application Provides accurate metal domes. Gives you the tactile feedback you need. As electronics get smaller, metal domes must be manufactured in sizes as small as 3 millimeters in diameter. These smaller tactile domes present manufacturing challenges for production designers. Therefore, we constantly confirm with customers in production to solve some potential problems.

Metal domes are used in electronic keyboards, and there is also a problem with the alignment of the dome switches. I wrote about how to install a metal dome before. Metal domes offer numerous advantages in terms of durability and robustness in electronic keypad applications. The metal dome is used as the switch of electronic equipment in the membrane switch, you can place the metal dome in each display according to the design purpose, we can produce according to your drawing and ensure the quality of the product. If you are interested in Best Technology metal domes, you can send us an email: sales@metal-domes.com

Have you ever faced such situation that your tactile Switches does not return back when press down it? It is what we call “dead key” of metal dome. It is fatal for metal dome, for it will lead that the whole product cannot work as normal. So why does the dead key occur? Can we solve this problem? Today, we will introduce the factors that cause the issue and how to solve it.

What dead key is?

The dead key phenomenon, characterized by unresponsive or stuck keys, can have a detrimental impact on the performance of tactile switches. By understanding the underlying causes and implementing effective solutions, manufacturers can ensure their products deliver a seamless user experience.

Reasons and solutions for dead key

Below are the common reasons and solutions for dead key, hope that will make sense for you.

1.Limited Lifespan of Tactile Switches or Metal Dome

Tactile switches contain metal domes, commonly referred to as keycaps or key domes, which have a finite lifespan. Over time, repeated presses can cause the key domes to wear out, resulting in dead keys. To address this, designers should pay more attention to the long lifespan of the metal dome, and selecting experienced manufacturers who can supply high-quality key domes that can withstand a substantial number of presses without compromising their responsiveness.

2.Insufficient Key Dome Rebound

The rebound force of a key dome is crucial for its proper functioning. If the rebound force is too low, the key dome may fail to return to its original position, leading to dead keys. So when the dead key issue occurs, we should prioritize optimizing the design and manufacturing process to ensure that key domes possess adequate rebound capability, enhancing the longevity and responsiveness of the switches.

3.Excessive Force Applied to Tactile Switches

Applying excessive force while pressing keys can cause damage to the key domes, resulting in dead keys. Educating users about the appropriate force required for key presses can minimize the occurrence of this issue. Additionally, it is needed to strive to reinforce the structural integrity of the switches to withstand reasonable force without impairing their functionality.

4.Excessive Travel Distance during Key Presses

Tactile switches have a specific travel distance, which is the distance the keycap travels when pressed. If the travel distance is too large, dead keys may occur when the keycap bottoms out and fails to register subsequent presses. Designers should carefully determine the optimal travel distance, balancing user comfort with reliable key registration.

5.Inadequate Ventilation in Key Domes

Proper ventilation is essential for effective key dome performance. Without adequate ventilation, air trapped beneath the key dome during a press cannot escape efficiently, leading to dead keys. If you don’t know how to design the vent hole, welcome to contact us for consulting.

6.Optimal Gap between Silicone Keypads and PCB

When utilizing silicone keypads in conjunction with printed circuit boards (PCBs), maintaining an appropriate gap between them is crucial. Insufficient gap spacing can restrict the movement of key domes, resulting in dead keys. Designers should carefully consider the dimensions and ensure an optimal gap to allow for smooth and unobstructed key presses.

Overcoming the dead key phenomenon in tactile switches is essential for providing users with an enhanced and seamless typing experience. Through continuous improvements in design, materials, and manufacturing processes, the dead key problem can be overcome, enabling users to enjoy smooth and consistent key registration, ultimately enhancing their overall satisfaction with the product.