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Technical Data
Design of a membrane keypad
As a rule, the outward-facing side of the transparent membrane is matt or gloss. Printing of the graphic overlays for membrane keypads/switches is done on the second surface. This protects the printing against environmental influences such as dirt, moisture and scratches. Graphic Overlays & Membrane keypads/switch are glued together using high-quality adhesive. If required, they can then be pressed together. Pressing of the membrane keypad is not standard, and is only carried out for special requirements, e.g. for increased tightness or impermeability to alcohol.
Assembly
Jemtek offers a complete service processing & assembly services. The customer benefits from faster delivery times, ordering expenses and a reduced risk of rejects. In this way, the matching of the keyboard adhesive layer to the various enclosure surfaces and accuracy of fit can be guaranteed.
Window Protection Blue Masking
On request, a protective blue masking can be printed only over the window of the graphic overlay. The blue masking can be removed, without adhesive residues, after the keypad has been fitted.
LEDs
In addition, LEDs, resistors or diodes can be integrated in the keypad (dependent on the height). For this purpose, the graphic overlay must be provided with cap embossing if necessary in the area of the LEDs.
Tails
The position of the exit point and the related length of the connection membrane should be specified during the design phase. The connection contacts are led out via the tail. The connecting lug is punched out of the keypad in the area of the exit so that the membrane cannot tear when bent. The standard grid is 1.0 mm. Avoid frequent bending. The ideal bending radius for the cable is > 4 mm.
Metal snap domes
Metal domes are manufactured from stainless steel. The contact side is gold-plated. The switching pressure for our standard snap domes is approx. 280gm – 350gm.
Colours
For Graphic overlay printing we use special colours. Printing is done on the second surface so the layers of paint are protected against harsh weather environment. Colours can also be printed according to the Pantone scale.
*Please note that the colours cannot be matched 100% to the expectations and the cost of matching the colours and additives for special colours are invoiced at cost.
ESD/EMI/RFI Shielding
ESD/EMI/RFI Shielding can be integrated into the keypad to deal with static discharges and to prevent interference frequencies. This shielding is also integrated in the membrane. Display window with shielding is available on request.
Embossing options
The main reason for embossing the membranes is to improve operation. Areas of the keys can be felt, and the membrane effect of the embossing improves the tactile response from the operating elements. Of course, embossing can also feature as a design element which highlights design membrane areas.
Dome embossing
Dome or pillow embossing is possible in diameters ranging from 8 to 17 mm.
Raised embossing
Raised embossing can be achieved in various forms.
Rim embossing
Rim embossing acts as a guide for the fingers. The surface level of the overlay and key surface remain the same.
Cap embossing
Cap embossing is a cap-shaped projection. This form of embossing is used for LEDs, which helps to level out of component height and intensifies the illumination effect.
Dead Front
Dead Front means an icon is typically hidden unless viewed under specific circumstances. The main idea is to only illuminate the graphics or symbols you want the user to see at any one time.
For example a car’s dashboard. The icons on the dashboard always don’t appear such as ‘ABS’, ‘Low Fuel’ or ‘Door Ajar’. However, if any problem arises, the icon lights up warning the user. This is called “Dead Front”. Jemtek provides customers with exceptional dead front products.