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Metal Dome Array – B3D 5112

Friday, August 5th, 2011

People always know different company make different products, and many customers ask us whether we can make a dome array with low profile, like Omrom B3D-5112.

Of course it’s no problem for us to make, this is one of our standard single key dome arrays, but what we used is different in some parameters, but has the same function.

Here are some parameters:

Name: Single key Metal Dome Array (similar like Omron B3D 5112)

Parameters:

Dome diameter:5mm;

Dome force: 160gf

Dome surface finishing: Nickel

Travel (Stroke): 0.2+/-0.05mm

Height (thickness of whole product):0.3mm+/-0.05mm

Dome material: stainless steel

Array material: PET with glue

Structure: Top Mylar (clear) + Bottom Spacer (clear)

Life cycles: 500,000-1,000,000 times

Color: Transparent (clear)

Switch capability: 12 VDC, 10 mA

RoHS compliant: Yes

Package: 144 pcs/sheet

(Pease order in multiples of 144 pcs dome array)

Lead time: 7-10 days

Here are basic price list for this dome array

Q’TY(pcs) Price Extended

1 $0.30 $0.30

25 $0.25 $6.25

50 $0.22 $11.00

100 $0.20 $20.00

144 $0.18 $25.92

288 $0.16 $46.08

576 $0.15 $86.40

1,000 $0.12 $120.00

1,728 $0.10 $172.80

3,456 $0.09 $311.04

For small order, you can buy it directly from our online shop: http://metaldome.ecrater.com/p/12096959/b3d-5112-dome-array, and payment can by Paypal, or credit card (register a Paypal A/C and then pay). For more quantity, please contact us for a better price for that single key, low profile dome array, B3D 5112.

Tags: B3D 5112, dome array, online shop, Paypal
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Metal Dome Array Color

Tuesday, April 5th, 2011

There’s color for every thing: Red, Green, Blue and etc. So it is the same for our metal dome array. Currently there’re two basic colors:

1) White

2) Transparent (Clear)

Of course, there’re other colors, if you print the silver ink (EMI), or choose rubber dome array, Light Guide Film (LGF), etc. But in this article, we only discuss above two basic colors. Others we will discuss in future.

Here are pictures showing them.

White metal dome array

white double layer dome array

Transparent metal dome array

Transparent four-legs dome array

Maybe you have following questions. In fact, they’re the most common question customer asked us:

A) Why color different

B) How to choose the suitable color of metal dome array

In order to answer this question, let me look back the structure of our metal dome array. You can see this blog “The whole thickness of our metal dome arrays” for more details.

As you can see, there’re two basic structures: Single layer and double layer, but both of them has the same Mylar layer. And the color of this Mylar is the same as Transparent (Clear), so to color of whole dome array is depending upon the color of Spacer.

For Single layer dome array, because there’s no Space layer, so color is upon on Mylar;

For double layer dome array, if Spacer is white, then whole product looks white; and if it’s transparent, then whole dome array like clear.

I think this is easily to understand. Isn’t it? So let’s go ahead with question #B “How to choose the suitable color of metal dome array?”

Here’re some basic principles:

—To choose White dome array, after assemble on PCB, you can not see anything from the PCB except where cutout on dome array, like below picture:

white dome array on pcb

So if you

a) Need to cover PCB and components on it; or

b) Need light cover or light reflect; or

c) Cosmetic requirements such as the keep environment harmonically; or

d) Other special requirements

—To choose Transparent (Clear) dome array, even assemble on PCB, you can still see the PCB, so if you

a) Want a see PCB in assembly process to adjust dome array location, for a easily consignment; or

b) No requirements to cover PCB and components on it; or

c) No light cover request

d) Other special requirements

Now I think everybody should be clear for color of metal dome array. Am I right? Leave a message or write email to us if you have comments, ideas, or question for dome array.

Tags: dome array, metal dome array, metal dome array color
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Light Diffuser Material and Function in Light Guide Film Dome Array

Tuesday, February 15th, 2011

Low-carbon, environment protection is widely considered in production design and daily life. Use a Light Guide Film (LGF) in your dome array will save LED quantity to save power consumption. This is why in recently years most of metal dome array in your cell phone will use LGF.

As most of LED viewing angle is 100-150 Degree and limited to light irradiation rang, even there’re light on the whole dome array area, but the light will be focused on certain area, the area around LED is more bright than other area. You can see from below picture.

led on light guide film

So you need to have a extra tooling to diffuse the light to make the it more well-distributed, then a light diffuser is very useful in that situation. Or you can call it “light masking paper”.

You can see this picture showing there’s a piece of light diffuser above each LED and the light irradiation is much better now.

light guide film with light diffuser

Oooh, you will say “So great”. Maybe you want to know what is made from. In fact, it’s very simple. It is a kind of single sided adhesive peel-off tape with two different colors on top and bottom sides.

The side with adhesive which stick on dome array is white (white is a good reflector), and another side is black (black will not disturb or affect the light irradiation). Here are pictures of them.

Top Side

light diffuser top view

Bottom Side

Light diffuser bottom view

The raw material of this light diffuser is a whole sheet so you need to divide it into several small pieces with the size you need. You just peel-off one small of them and put on LED with light press, it’ll be stick firmly on light guide film of dome array. Very easily!

Normally we will not provide the light diffuser along with the LGF, so if you need them, please talk with us when you order LGF dome array with us and we will do it for you.

Leave a message if you agree with me, or have some comments.:-)

Tags: dome array, LGF, LGF dome array, light diffuser
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How to Assemble Triangle Series Metal Dome on PCB (2)

Friday, July 2nd, 2010

See previous article here: How to Assemble Triangle Series Metal Dome on PCB

Question # 2: If soldering triangle dome is not recommended, then is there any better method to fix it?

Best Tech Answer: Of course. There’re three methods to make it:

A) For the triangle metal dome with leg, you can insert the leg directly to the PCB, and then curve the leg at back side, make sure it could buckle the PCB. That’s the common way.

Triangle metal dome with leg on PCB

But to be noted that the assembly speed is slow. So you need to calculate how much you need to pay for extra human handling fee.

To have two location holes on the PCB and choose the different leg length in accordance with thickness of PCB are two important things should be considered during your design.

PCB with triangle metal dome

Normally thickness of PCB which will use triangle metal dome are 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.6mm, 2.0mm, and the leg length of our triangle metal dome are 0.8mm, 1.5mm, 3.0mm, and a special one: 2.4mm. You need to choose a longer leg to insert into PCB and bend it. For examples, if you use 1.6mm dome, then our 3.0mm leg will be fine.

B) Directly using the adhesive tape to stick on the metal dome on PCB.

It will save little time compare with insert leg into hole of PCB (method 1).

But the stickiness of common transparent adhesive tape is not so well, metal dome was intended to be shifted or peeled off.

Also thickness of adhesive tape is too thin compare with height of metal dome, it’ll cause uneven of whole products, and too many bubble between PCB and adhesive tape.

C) Using metal dome array.

Triangle metal dome array on PCB

This is the most convenient and precision assembly method. Although the price is a little higher than other two methods mentioned before, but you will save a lot of time on inserting leg into hole of PCB or put adhesive tape on PCB, you only need to peel off dome array from liner paper and put whole products on PCB. In a word, this will increase assembly efficiency, precision (avoid potential alignment problem), and then reduce whole price.

According to different request of clicking feeling, you could use circle/triangle/four leg metal dome. If you want to get more information, please kindly visit our website for reference: http://www.metal-domes.com/cn/product-dome-array.htm

Ok, my friend, now do you have a idea to design and assemble your PCB with triangle metal dome? J

Let me know if you want to know more information on installing triangle metal dome, I will be happy to answer you anytime. We, Best Technology, are always be your best partner in metal dome and metal dome array in China.

Tags: metal dome, metal dome array, metal dome assembly, PCB, triangle metal dome
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How to Assemble Triangle Series Metal Dome on PCB

Friday, July 2nd, 2010

We have discussed assemble metal dome on PCB before, see “How to make the metal dome array to stick on the PCB firmly?”), but more and more customers asking for more details, plus pictures showing how to install various triangle metal dome, with and without legs. So we wrote an article plus some additional information and hope customers will understand the way more better.

Firstly, let us have a overlook at the specification of the triangle series metal dome. From the picture, you will see it includes four basic types: no leg, short leg, medium leg and long leg.

Triangle metal dome

The metal dome leg length divides into three basic series: 0.8mm, 1.5mm, and 3.0mm. We also have a special one which is 2.4mm. Of course, we can customize special leg length of metal dome, please contact us directly for more details.

Follows are popular questions & feedback from our customers and people in metla dome related forums, we summarize them and think you will understand more clearly.

Question #1: We want to solder a the triangle metal dome.

Best Tech Answer: For triangle metal dome, we don’t recommend solder it on FPC/PCB or membrane switch. When you press center of metal dome, the domes collapse and make contact with the secondary pathway, thereby closing the circuit. See more how metal domes work : . http://www.metal-domes.com/blog/2006/11/13/how-metal-dome-works/.

So if you solder it, three sides of metal dome cannot be extended as per designed, click feeling will be lessen, force always changed, and life cycles become low, and sometimes, dome will not return to its original position and become broken. We named it as “dead key”.

— to be continued:
How to Assemble Triangle Series Metal Dome on PCB (2)

Tags: metal dome, metal dome array, metal dome assembly, PCB, triangle metal dome
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Characteristic of Adhesive in our Metal Dome Array

Monday, May 10th, 2010

Many customers asked us about the stickiness of our metal dome array because most of what they used are 3M series such as 3M 467, 468 etc. So they will compare the adhesive in our dome array with 3M and they will have a common question for the stickiness, and they worry about whether the metal dome array can stick firmly on PCB.

The adhesive is special which is different from 3M AD: The stickiness of Adhesive at initial step is weak, so that itâ€™ll be convenient for worker to put and peel off again and again on or from PCB, in case some times the alignment is not right so that worker can easy peel if off at initial process. However, after a period of time, the stickiness become more strong and strong, and then dome array will stick firmly on PCB and cannot peeled off.

Whatever Nokia, iPhone, Motorola, Blackberry, the metal dome array under their cell is using the same dome array material like ours. We are always doing our best to provide best products & service to customers, so we use the same material as Nokia choose.

In next article, I will discuss issue how to enhance stickiness of metal dome array on the boards. Let me know if you have any question for metal dome array, Best Technology always like to be your best partner in metal dome and metal dome array.

Tags: metal dome array
Posted in metal dome array | 1 Comment »

How to make the metal dome array to stick on the PCB firmly?

Thursday, March 11th, 2010

Recently, we have got some customer feedback about the issue of the adhesive. They complain about the adhesive is not stick firmly on their boards and want to know why. In fact, we test the adhesive by ourselves, it can be stick on the boards firmly. It is hard to peel off from the boards.
Please follow me to attention the notes when you stick the metal dome array:

First, please do not touch the part of the adhesive when your operator stuck;

Secondly, Please make sure the surface of PCB/FPC to be clean, free of oil, dust, or others;

3rd: Try your best to stick dome array on your board just one time, don’t put it on, then peel off. Too many times of re-assemble will lessen adhesive of dome array;

4th, please press one time after you assemble metal dome array on the boards, the adhesive is also pressure sensetive one so suitable pressure will enhance the stickness.

If you need the more information, please contact us anytime.

In next time, I will write an post discussing how to assemble metal dome on PCB. Please continue to visit our blog:-)

Tags: metal dome array, PCB
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How to know the stroke of the metal dome & metal dome array?

Friday, November 27th, 2009

How to know the stroke of the metal dome & metal dome array?

There are so many customers to ask this question. I know it is very important for the product design. You should leave the enough space for the metal dome & metal dome array between your PCB & cover layer.

This time follow me to clarify this question, it is very easy for us whom are specializing in this industry for so many years.

For the metal dome, you can see our 6mm diameter, four-leg shape metal dome. The total height is 0.31mm, & the thickness of the material is 0.06mm, so the stroke is 0.31-0.06=0.25mm.

The formula is: Stroke= Height – Thickness of material – Thickness of the dimple (if there is a dimple in center).

Four-leg metal dome

For the four-leg metal domes, the life cycles always have the one million times. & they are popular used in the membrane switche products.

For the metal dome array, you can see the follow picture:

The structure of the Metal dome array

You can see the 3# spacer is parallel to the 2# metal dome & the thickness is lower than the domes. So you can ignore the thickness of the spacer. The total height = Mylar + Metal dome=0.05+0.31=0.36mm. For the more detail, you can see my last blog.http://www.metal-domes.com/blog/2009/11/07/the-whole-thickness-of-our-metal-dome-arrays/

How about the stroke? In fact, it is the same as the natural metal domes. It should be ignored the thickness of the Mylar & Spacer. So you can use the above formula to calculate the stroke.

I think you are fully understand the stroke of our metal domes & metal dome arrays now. If you need further & more information, please do feel free to contact us.

Best Technology Co., Ltd

www.metal-domes.com

Tags: metal dome array, metal dome storke, metal dome thickness
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IQC For Metal Domes

Thursday, October 15th, 2009

Recently, I have found there are so many different names regarding the metal dome. metal dome, which we normally called, some called “Snap Dome”, Tactile Dome, and Dome Switch, and so on. It is a very interesting phenomenon.
I have checked there is a question everyone should be very concerned about this issue. So I have posted the content of my answer as below, I hope to be helpful for all of you.

A guy in BBS asked “How to solve the following problem?”
1. What should we pay more attention about the quality of the metal domes?
2. How can we check?
——– The following is my answer.

Simply speaking, for your IQC department to check the metal domes, they need to note the following points:

1). Shape (clean, dirt, dust, grease stains & deflashing);

2). Actuation force (test by force gauge machine);

3). Contact resistance & stability.

4) You can press the metal dome for several times to check whether the dome can rebound to original position or not. (the process named as metal dome rebounding)
If what you make it metal dome sheets, the following should to be known:
5) Appearance of PET (clean, dirt, grease stains)
6) Lose or double metal domes
7) The location of each dome is the same as the drawing of the PCB
If there is EMI printing, pleas take care of the quality of the tracing
9) Others, such as location holes, out line, and so on.

For more information, please visit our website:
http://www.metal-domes.com/Quality.htm

Our dust-free workshop make sure the clean of the products. & Our experienced masters & workers with many years fruitful production experience, we have well developed a team of dedicated management and supporting staffs. Our major concern is to produce good quality items.
Our R & D professionals with strong marketing sense and innovative ideas, we will continue to launch numerous trendy array products to meet for customer needs.

Best Technology Co., Ltd., who specializes in manufacturing metal domes & metal dome arrays for more than decade years of experiences, is engaging in offering the best quality & service to all of our customers.

Tags: metal dome QC, metal dome quality
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Metal-Dome

Archive for the ‘metal dome array’ Category

Metal Dome Array – B3D 5112

Metal Dome Array Color

Light Diffuser Material and Function in Light Guide Film Dome Array

How to Assemble Triangle Series Metal Dome on PCB (2)

How to Assemble Triangle Series Metal Dome on PCB

Characteristic of Adhesive in our Metal Dome Array

How to make the metal dome array to stick on the PCB firmly?

How to know the stroke of the metal dome & metal dome array?

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