Why the Metal Dome Inside the Touch Switch Is No Function?

A lot of problems will come across when we use the touch switch. Why the metal dome inside the touch switch cannot be pressed?The truth is the touch switch no function. There are many reasons to be think about why it is no function.

To begin with, life is the first one that cause the metal dome cannot be pressed. At this moment, Best Technology recommends putting the metal dome to the life testing equipment and analyze whether the life of metal dome has already reached the working life.

Secondly, operating the metal dome in a wrong way will also cause it no function. Generally speaking, visualization is able to judge whether the metal dome can be pressed. Because the original shape of the metal dome is convex. If the shape of the metal dome is concave, it indicates that the metal dome cannot be pressed.

Finally, even though the metal dome can be pressed but it still has no function. It means that the touch switch is not conductive. There are several reasons for this. On one hand, the legs of the touch switch were oxidized or damaged. On the other hand, the metal dome inside the touch switch was oxidized, too. so that the outer oxide layer would prevent conductivity.

touch switch with four legs

touch switch with four legs

Since established in 2006, Best Technology Co., Ltd. was founded specifically to serve the membrane switch and related mechanical switch industries, to be customers’ best partner of metal dome and dome array in China.

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Why the Key of Metal Dome Is Invalid?

  1. The metal dome and PCB have poor contact when there are dirty things on the dimple of metal dome.

Solution: replacing a new metal dome; wiping the metal dome; using the metal dome that has lots of dimples in the center

  1. The goldfinger on PCB (printed circuit board)/FPC (flexible printed circuit) is oxidized then affect the contact between the board and the metal dome.

Solution: replacing a new PCB or FPC

  1. The shape of the metal domeis not matched with the shape of tabs on the PCB/FPC.

Solution: replacing the corresponding metal dome according to the shape of tabs on the PCB/FPC.

four leg metal dome

four leg metal dome

  1. The gap between metal dome and the key is too large.

Solution: changing another metal dome with suitable stroke according to the parameter of design.

  1. The gap between the keys is too small

Solution: increasing the height of metal dome or shorten the gap between the key and metal dome.

Since established in 2006, Best Technology is always dedicated to provide the most suitable products for clients, to be customer’s best partner of metal dome and dome array.

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How to Assemble Metal Domes?

What should we do after collecting the metal domes? Please check the video below.

The video shows some steps of how to assemble metal domes. At first, we need to customize an assembly jig according to the products those customer needed. Then put the tube that has already collected metal domes in the corresponding hole of the jig. The adhesive PET film has been already positioned in the jig and the metal domes will pop out through the airflow from the bottom to the top when pressing the assembly equipment. At this moment, the metal domes will be pasted on the hole of the adhesive PET film. After that, the process of assembling metal domes is over. It is very easy, right?

By the way, if you would like to know further information about collecting metal doems, please click How to Collect the Metal Domes to the Tube?

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How to Collect the Metal Domes to the Tube?

We often receive a question from the customers like this: “How to place the metal domes on the adhesive PET film?” General speaking, there are two methods to assemble the metal dome on the adhesive PET film, including half-auto assembly and full manual assembly. The half-auto assembly is applicable to the oblong metal dome or the circle metal dome with smaller diameter, such as diameter 4mm and 5mm. Because the half-auto assembly will be used to answer the question, the full manual assembly will not be explain in details. In order to show you the details about how to place the metal dome on the adhesive PET film, two videos have been prepared as following?

The first step is collecting metal domes. Please click the video below: How to collect the metal domes to the tube?

To begin with, the metal domes are needed to put in the collecting machine and the tube which is used to collect metal domes should be placed in the end of the conveyor belt. Then the metal domes move slowly on the conveyor belt and the direction of them also change slowly. All of metal domes are in one direction and face up. Only in this way to ensure the metal domes are face up when they get into the tube. However, why the metal domes require to face up? Because the adhesive PET film is facing down during assembly, the right way to assemble is that the metal domes face up to the adhesive PET film. Meanwhile, at the next video you will know the second step about metal domes assembly, click here for more: How to Assemble the Metal Domes?


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Fingerprint Inspection Method for Metal Dome

In the manufacturing process of metal dome, the metal dome will be inevitably touched by fingers. The fingerprint and grease left will accelerate oxidation of metal dome and reduce its life. Then the quality of the metal dome getting lower is followed. Therefore, the quality inspection of the metal dome is one of the important parts to enhance the product competition.

Nowadays, the visual inspection is used by a majority companies, but it is inefficient and easy to misjudge. In order to improve the production efficiency, so a sort of method based on machine vision for fingerprint inspection of metal dome was proposed.

The method uses Generalized Hough Transform to locate the target, extracting the Gray-level Co-occurrence Matrix of targets and supporting Vector Machine classification, which realizes the automatic inspection of the quality of the metal dome. Most of the experimental results show that the method has achieved good effect and got practical and promotional value in a certain.

Since established in 2006, Best Technology always tries its best to use the most advanced technology to inspect the metal dome, to be customers’ best partners of metal dome and metal dome array with high quality.

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What Will Cause the Metal Dome Can’t Rebound?

The reason why the metal dome is pressed but do not rebound maybe related to the operational environment as well as the using habits of the operators. The metal dome must be used in a flat surface. It is a very long stroke if the metal dome is pressed on a concave surface, which is easy to cause anti-concave of the metal dome. And pressing the metal dome with a strong force will also cause anti-concave of it.

In addition to the above reasons, there is still another one: the metal dome has deformed.

As known to us, the metal dome will be deformed by the external force. There are several possibility will cause like that:

  1. The material is squeezed during transportation.
  2. The metal dome is stuck by the jig.
  3. Tweezers are used in the manufacturing process.

Now we have already know the reasons, but how to prevent? Details as below:

Preventive measures

  1. Using foam to wrap a few laps when the material is packed, then put it into the carton,sticking a fragile tag and ask the courier to take it carefully during transportation.
  2. Using tweezers to pick out the metal dome that is stuck by the jig.The metal dome should not be reused if it is stuck in the jig.
  3. In order to prevent the metal dome from deformation, using tweezersto clamp the metal dome should be lightly in the manufacturing process.

If you also would like to know further information of click feeling about metal dome, click here to read How to Calculate the Click Feeling of Metal Dome?

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Meeting Customers from Vietnam–First Stop at the Office

On October 18, 2018, Customers Son and Nguyen from Vietnam visited Best Technology. They are very interested in our metal dome and Flex PCB. For the first stop, they came to our office and there were a warm welcome for them. To begin with, our salesman Connie and Celine introduce the information about metal dome and FPC to them. During the conversation, in order to provide the most suitable products and the most service for customers, we have also learned their requirements.

Connie is introducing metal dome

picture1: Connie is introducing metal dome

In order to let the customers know Best Technology well and build a good sense of trust, we showed the culture and strength of our company. A video was played to let them learn more about our company’s product manufacturing capability and history.

Customers are watching the video

picture2: Customers are watching the video

After the meeting, we invited the customers to sign their name on the company cultural wall and took a photo with us.

Taking a photo

Ppicture3: Taking a photo

Since the customers know more about our strength and culture, so they would like to visit our factory. For more details about the second stop, continue to read:

Meeting Customers from Vietnam–Second Stop at the Flex PCB Factory

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National Day Holiday Notice

The National Day is around the corner, and everyone will back home or go out for travelling. As usual, the factory of Best Technology will be closed from October 1st, 2018 to October 3rd, 2018. And we will back to work on October 4th, 2018. Therefore, please go ahead or postpone your orders if you have any plans for fabrication. During the holiday, please feel free to contact us at +86-755-2909-1601, or sales@metal-domes.com with any questions.

We wish you and your family have a wonderful holiday and we thank you for your continued supporting.

Respectfully Yours,

All the members of Best

Best, always be your best choice of metal dome and dome array in China.

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The Click Feeling and the Life of Metal Dome

In a certain force, what will change if the click feeling of metal dome gets greater? Yes, the return force will get smaller, the stroke of the metal dome needing higher, the height getting higher and the life getting shorter. So the click feeling should be controlled between 50% and 65% in the process of production. In this way, not only can ensure the good click feeling of the metal dome, but also can prolong its life.

Besides, the life of metal dome is also related to its height, thickness, process flow and the experience of the designers. In general, the thickness and the stroke is higher if the height of metal dome is higher. And meanwhile, the life of it will shorten.

BEST, always be your best choice of metal dome and dome array in China.

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Good to Know Something about the Air Vent on Metal Dome

Most customers will ignore the air vent on the metal dome when they plan to design the metal dome array. Actually, whether it is single key, or multiple key, we will add the air vent on the original drawings of the customers when making samples. As the name implied, the mainly function of the air vent is to release the “air” from the dimples of the metal dome when pressing the metal dome. Besides, adding the air vent is to make the feeling get better when touch.

If there is no air vent, there will be a certain chance that the metal dome not come up when pressing. Of course, the single key dome array may not have an air vent when the diameter is large and the height is relatively high.

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