Unique Features of Different Types of Domes Used In A Tactile Membrane Keypad

 A membrane keypad may be made up of tactile and non-tactile switches. The tactile switches are fitted with metal domes and provide the users with tactile feedback after pressing a key. The non-tactile switches may not provide the users with tactile feedback. However, the entire keypad or each non-tactile membrane key is backlit using LED, LGF, EL or a combination of fiber-optic films and LED. The backlit keys become illuminated after being pressed. Thus, tactile and non-tactile membrane keypads can both provide the users with feedback.

It is possible to add the metal domes of varying sizes and shapes when manufacturing a tactile membrane keypad. The metal domes are fitted to the underside of the graphic interface. They are open contacts that complete the circuit once a membrane key has been pressed. The metal domes can provide the users with consistent tactile response alongside enabling the manufacturing companies to create durable switches that can be used in any type of environment. The metal domes are made of stainless steel. The performance of a tactile keypad depends largely upon the venting of metal domes. In tactile keypads, the air moves in and out from under a metal dome and the phenomenon is known as venting.

A tactile membrane keypad has to be adequately vented in order to perform properly. The absence of venting or inadequate venting may have adverse effects on the function and feel of a tactile switch. The metal domes fitted to a membrane keypad may be four-legged, round, triangular, oval or square in shape. Their size varies depending upon the size of the user-interface. A manufacturing company may customize the shape of metal domes based upon the specifications of different clients alongside customizing their size. The four-legged metal domes are also known as cross metal domes. They are integrated to silver-flex membrane switches, single-sided or double-sided PCB switches and FPC circuits.

The four-legged metal domes last longer than the triangular domes and produce better ‘snap feel’ than a circular or oblong dome. The lifecycle of this type of metal dome is usually higher than one-million. The circuit boards of some of the membrane keypads are made up of two or more layers. The circular/round metal domes are integrated into this type of circuit board. It is also possible to fit this type of metal dome to a precision switch. The circular metal domes are smaller than the four-legged domes and are ideal for a smaller user-interface.

The triangular metal domes are used on a single-sided or double-sided PCB, silver-flex membrane keypad or FPC circuits. The triangular domes can be used with small user-interfaces, such as user-interface of small handheld devices. They can generate a click feel once a switch has been pressed. The triangular metal domes have two legs and can handle up to 6,000 gram-force. For more information visit here: CSI Keyboards, Inc.

Top Membrane Switch Manufacturer - CSI Keyboards, Inc. (978) 532-8181

 

CSI Keyboards, Inc.
56 Pulaski Street
Peabody, MA 01960
(978) 532-8181
http://csikeyboards.com/membrane-switches/

Switch Membrane - CSI Keyboards, Inc. (978) 532-8181

 

CSI Keyboards, Inc.
56 Pulaski Street
Peabody, MA 01960
(978) 532-8181
http://csikeyboards.com/membrane-switches/

Membrane Keypad - CSI Keyboards, Inc. (978) 532-8181

 

CSI Keyboards, Inc.
56 Pulaski Street
Peabody, MA 01960
(978) 532-8181
http://csikeyboards.com/membrane-switches/

Membrane Switch Manufacturer - CSI Keyboards, Inc. (978) 532-8181

 

CSI Keyboards, Inc.
56 Pulaski Street
Peabody, MA 01960
(978) 532-8181
http://csikeyboards.com/membrane-switches/

Membrane Switch - CSI Keyboards, Inc. (978) 532-8181

 

CSI Keyboards, Inc.
56 Pulaski Street
Peabody, MA 01960
(978) 532-8181
http://csikeyboards.com/membrane-switches/

A Quick And Comprehensive Design Guide of A Membrane Switch

The user interface of a Membrane Switch is a very important component. The graphic overlay deserves special mention at the outset because its appearance is integral to your view of the device. Remember you’re the operator here and your equipment is the membrane switch. You can produce virtually all colors. The space between lines or the finest line has a thickness of .006 inches. You can print it effectively. The maximum line screen of the switch is 230 LPI for process printing and graduating halftones. Some halftones also graduate along the process. LPI is the acronym of lines per inch. Do keep it in mind.

The display windows

In a Membrane Switch, you can use embossing either with non-tactile or tactile switches. However, don’t do pillow embossing only as it doesn’t elicit a tactile response. You can easily incorporate LED indicators and integral display windows into the design of a membrane switch. Block and single point LEDs have minimum limitations. They can perform nicely with any type of material surface or material finish. However, if you want more diffusion, you can go for a textured or matte surface. LEDs cannot emanate from the tactile switch’s active area, although you can graphically make them appear as a part of the membrane switch.

The integral LEDs

Surface-mounted LEDs or single point, integral LEDs are an important part of a Membrane Switch. You can mount them onto the circuit’s bottom layer. It’s the lower circuit in this regard. You can find a wide variety of colors, which include bi-colors. You can then provide termination from the same connector end or tail as a membrane switch. However, there will be termination only if you emboss the graphic layer for accommodating the LEDs. You don’t need to emboss the graphic if you provide LED termination on a separate tail.

Designing the digital windows

You can design digital windows for enhancing the specific display that you’re using in a Membrane Switch. You need to remember that texture might distort the displays’ appearance that don’t directly go against the design or overlays. Gloss finishes and matte work best. You can print translucent filtering inks for improving the texture and appearance of displays. If it’s an LCD, the window will not have any color whatsoever. The anti-glare or matte finish provides superior scratch resistance. It’s higher than the clear or gloss finish. However, it may diffuse textures and displays that are .060 inches away.

More on the display

A red LED showcases appearance. It shows a lot of improvement with the addition of smoke gray or red color. You can use red for achieving better readability and visibility in low light conditions. You can choose smoke grey in radiant settings or the environments that have LEDs with other colors. The concept remains the same with yellow, amber or green LEDs. You can use amber yellow or green filters in a careful manner. Don’t overdo it. Use the colors for low light conditions. Deadfronting or hiding the color until it’s lit is another option, which you can include if the system entails a dark background. For more information visit here: CSI Keyboards, Inc.