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What should be the design layout of large silicone rubber keypad switch?

What should be the design layout of large silicone rubber keypad switch?

Sep 15, 2021

Significance of large silicone rubber keypad switch

The key switch is a very important part in determining the keystroke feeling of the large silicone rubber switch. Moreover, other parts such as keycaps and cases also affect the sound of keystrokes, but the key switch itself determines basic parameters such as the feel and weight (load) of the key.

large silicone rubber keypad switch

A bright reader about keypads would have pinned, “Oh, this time we’re talking about the red and blue axes!” Of course, there will be talk of parts called “axis”, but this time I will give you a rough classification of the input method of the key switch and the outline of the “mechanical method” which is the main topic of the self-made keypad.

Why you should prefer large silicone rubber keypad switch?

Durable and reliable! In addition to stainless steel keypads, of large silicone rubber keypad switch membrane keypads are among the most frequently common input elements in device and apparatus engineering.  Construction and properties combine robustness, durability, and high functional reliability.

Main applications for membrane keypads

Membrane keypads make a decisive contribution to avoiding costly downtimes at the human-machine interface. At the same time, membrane keypads enable precise operation, which keeps operating errors to a minimum. Furthermore, it is even under the toughest environmental conditions.

But the membrane keypad is also very popular in the medical sector. Due to their closed surface, the large silicone rubber keypad switch is waterproof and can therefore be cleaned quickly and easily. In addition, lack of furrows and grooves between the keys also makes it impossible for impurities to settle.

Special technologies; refine your membrane keypad

Numerous additional features ensure maximum adaptability. Our offer also includes different surface treatments for membrane keypads. From UV protection to antibacterial coatings, we refine membrane keypads according to your wishes.

A haptic feedback to generate, we offer several ways. In addition to the classic embossing, of large silicone rubber keypad switch, a haptic feedback based on resin or the application of a haptic varnish is also possible.

Individual design and layout for your membrane keypad

Would you like to have a logo on your keypad or would you like a special key arrangement? The advantages of membrane keypads are the almost unlimited freedom of design. The designer of a device can freely determine the number of keys, the key position, and the shape of the keys.

In addition, there is the equally free choice of the graphic design of the user interface. Let our   team advice you on this!

Why you should use large silicone rubber keypad switch

Membrane keypads offer thin metal domes as mechanical switching elements. On the other hand, large silicone rubber keypad switch takes place through the contact of the foil surface with the lower switching foil.

Advantages of large silicone rubber keypad switch

The advantages of a membrane, rubber keypad switch involves:

  • Firstly, bio-chemical, or liquid-repellent coatings
  • Secondly, lighting options
  • Moreover, capacitive sensor elements or
  • Apart from this, double contact function
  • Use of UL certified materials
  • Furthermore, avoidance of downtimes through well-engineered, solid construction
  • Also, investment and cost advantage through long service life
  • Additionally, effective operation due to the low rate of incorrect operation
  • Integrated cursor operation using, touchpads is part in large silicone rubber keypad switch
  • Besides, cleanliness thanks to the easy-to-clean film surface with a flat profile
  • Lastly, convenient system integration through various installation mountings

Customer-specific options for large silicone rubber keypad switch

  • First, shape and dimensions of the front panel of the membrane keypad
  • Second, number and position of the short-stroke keys
  • Also, flexible design of the keypad membrane
  • Moreover, integration of additional control elements such as joysticks, touchpads, trackballs
  • Above all, integration of feedback and status displays such as LEDs or mini displays

large silicone rubber keypad switch 2021

 

Where are membrane keypads common today?

Following are some reasons, based on which large silicone rubber keypad switch should be chosen instead of membrane switches.

 

 First, mechanical engineering

Second, control technology

Moreover, measuring technology

Additionally, medical technology

Above all, communication technology

What are the advantages of the membrane keypad over other keypad technologies
 Firstly, the keypad closed on the front prevents the ingress of dust and water jets (IP65)

Insensitivity to many chemicals such as oils, detergents, alcohol, gasoline, bleach, and others

In addition, graphic design freedom

Apart from this, variable geometry

 Large silicone rubber keypad switch offers, favorable price per switching unit

Above all, very flat construction is possible

Lastly, integration of slide-in pockets for flexible labeling, displays such as LEDs and LCD displays

The mechanical structure of the membrane keypads

Flat input keypad Construction as a flexible circuit carrier with adhesive film on the back
Foil-covered short-stroke keypad: Structure with closed design foil on aluminum sheet, high-quality short-stroke buttons on a circuit board, connected with spacers via stud bolts
Membrane keypad with printed circuit

 

Structure of large silicone rubber keypad switch a closed design film on the circuit board, the components and the controller are on the back

Circuit carrier in large silicone rubber keypad switch

Foil-covered short-stroke keypads are very torsion-resistant due to the front panel. The short-stroke keys are very durable and allow the keys to be switched precisely. Depending on the button selection, different grid dimensions and overall heights are easy to implement.

As well as buttons with point illumination or light fields. The front panel, for example, an aluminum sheet, also provides electromagnetic shielding as a side effect. When it comes to switches, silicon is the most important element in this and hence in large silicone rubber keypad switch.

The basic structure of the membrane keyboard

The following shows the basic structure using a flexible membrane keypad.
The film is built up in several layers. The basis is the switch comb film. The snap disk closes the electrical contact on the switching comb film. So that the snap disk is fixed, you need spacers and the fixing film. Right at the top is the decor or design film, which is embossed here with a pillow.

Connector –                                   The interface to the controller

Direct plug connection Here, the film is inserted directly into a socket. The somewhat stronger terminal lug is sealed with carbon lacquer at the contacts and is, therefore, more abrasion-resistant. In addition, the contact silver remains on the conductor track (no silver migration).
Indirect plug connection Any plug, dimensioned in the grid dimension of the terminal lug, can be mounted on the conductor strip here. The corresponding counterpart is located on the circuit board of your controller in large silicone rubber keypad switch
Key feeling                               Embossing and snap disk
In order to quickly reach the keys on the membrane keypad and to recognize them without errors, a so-called embossing of the membrane and snap disks provide tactile feedback.

Imprints in large silicone rubber keypad switch

 

Embossed keys Increase in the key area (key embossing) of  rubber keypad switch
Key edge embossing The key edge embossing puts the greatest strain on the film due to the many radii. Instead of the key edge embossing, a printed relief is chosen today (see below).
Cushion embossing The pad embossing has the advantage over the other embossing in that the keypad is easy to clean, as there are no edges where dirt can accumulate.
Relief embossing only the edge of the key is raised (like a relief)
The embossing height is up to 1.5 times the film thickness in a large silicone rubber keypad switch. Only with cushion embossing is it possible to use a greater embossing height due to the small curve radius.
Aspects in large silicone rubber keypad switch

1-Snap disk in large silicone rubber keypad switch

There is also the option of installing a snap disk in the buttons so that a response (let’s say like a quiet cracking frog) occurs.
2-Feedback and tactility
The following diagram shows a typical force-displacement curve when the button is pressed and released. The course shown here describes a gentle stop of the button.

Integration of displays and slide-in strips

Displays Displays can be integrated under the decorative film. The decorative film is not damaged in the process. The window can be made clear/matt or colorless / colored.
Slide-in strips Moreover, Slide-in strips serve a changing keypad function (e.g., switching to a different language keypad layout) is involved in silicone rubber keypad switch
More importantly, the slide-in strips can be inserted between the foils from the front, from the side, or from the rear.

Electrical interconnection in large silicone rubber keypad switch

The individual buttons are interconnected as a matrix or as a network with a common control line. Sometimes there are also mixed forms of both. Hence, miniature LEDs can be integrated into the film. The lines required for this are brought out separately.
Scheme: matrix circuit
Advantage of matric circuit

The advantage of the matrix circuit when using many buttons is the relatively small number of plug contacts. However, the matrix connection requires intelligence in the form of a decoder. Furthermore, this is the main advantage of  silicone rubber switch

Scheme: the mmon control line

Significance of no decoding in large silicone rubber keypad switch

In contrast to the matrix circuit, no decoding is required with a common control line. This interconnection only occurs with a lower number of keys. A number of plug contacts = a number of buttons + 1. This description should only give a brief insight into the basic things that are possible

Custom production of membrane keypads

Do you have a project and don’t know where to develop and manufacture the membrane keypad? Then we will provide you with our know-how, which we have built up over many years so that we can contribute our part to the success of your project.

In addition to the silicone rubber keypad, we also have our own keypad controllers in the program so that you can get everything from a single source. This saves time and nerves! The keyboard surface and the circuits beneath are connected to each other.

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