We realize customer-specific membrane switch and advise you comprehensively on equipment requirements and technical features.
Due to the extraordinary variety of design options, membrane switches are used in almost every type of electronic device. The ergonomic and design requirements are nearly unlimited.
Membrane switches are dirt and water resistance. They are used when a compact design is needed or a small number of units are desired because of comparatively low tooling costs.
You can choose from a variety of constructions of varying tactility and a wide range of viewing windows, screens and lighting options. In addition, we offer the patented Duraswitch technology.
- low weight, space saving
- backprinting of the film for a robust, individual design
- individual tactility
- dustproof and water resistant, resistant to chemicals (solvents)
- easy to clean
- over 1 million life-time cycles
- EMC shielding possible
A keypad consisting of a plurality of individual layers which are superposed on each other. By default, there is a membrane keyboard from 5 basic foils: decorative foil, upper & lower switching foil, a spacer film and a adhesive foil.
The decorative foil is made of polyester or polycarbonate and ensures the highest possible protection against abrasion. For applications in the medical field and areas with high hygienic requirements, the front foil can be equipped with an antibacterial coating. Also UV-resistant polyester for outdoor use is possible.
Functional elements are the lower circuit foil with the conductor tracks, switching points and the terminal lug located thereon, as well as the upper switching foil with the contact surfaces which lie opposite the switching points on the lower foil. The upper switching foil can be dispensed if it is replaced by metal domes, or the contact surfaces are printed directly on the decorative foil.
For special applications and complex circuits, the lower switching foil is made of polyimide (Kapton) instead of polyester. A hard printed circuit board made of FR4 is suitable for circuit design and at the same time acts as a carrier plate with mounting screws or sockets. The spacer foil as an insulator separates the upper and lower switching foil; in a version with metal domes, it has the task of fixing foil.
For a striking tactility and higher actuation force metal domes can be used. When the metal dome is actuated, it snaps downwards and establishes contact between two printed conductors.
Membrane switches without metal domes may also have tactile feedback using dome embossing design. The dome embossing can be done in the decorative film as well as in the upper switching film. For a stronger operating force and tactility, even both of the two films can be shaped.
Memebrane switch with silicone keys / rubber design
The membrane switch is as usual provided with a polyester decorative film, but the buttons are made of silicone. The keys have a grippy key surface, which gives the feeling of a high-quality keyboard. The key shape can be realized in various geometries. Alternatively, the decorative film is completely replaced by a silicone layer. This allows for outstanding buttons with free shaping, guide elements such as offset rings around a key, Braille lettering or cursor keys. At the same time, the surface is upgraded visually and haptically.
Memebrane Switch in metal design
Specially embossed films can be used to achieve metal-optic effects, such as brushed stainless steel or anodised aluminum.
Memebrane Switch with epoxy coating
High-quality three-dimensional design elements can be realized with epoxy. Instead of a "normal" embossing, epoxy material is applied to the button, which creates a particularly high-quality and glossy surface due to its transparency. The epoxy design can be used with most membrane keyboards.
LEDs can be easily integrated into membrane keyboards by the integration of an additional LED switching foil. Special adhesives and sealing materials are used to control the function of the LED even in a harsher environment with e.g. ensure strong vibration.
Light Guide Film, also with disappearance effect
Backlighting of membrane switch can be done by using LGF (Light Guide Film). The typical flat design and flexibility are retained. In the LGF technology, LEDs are used on the edge in a very thin (0.1 - 0.2 mm), highly refractive film. Due to the high refraction of light only very few LEDs are required for homogeneous illumination. The backlighting of each button can be done in different colors.
Also with the LGF technology a "disappearance effect" can be realized. The keyboard symbols are only visible when the HMI device is switched on.
Memebrane switch with integrated touch panel
An integrated touch panel creates a combined input system that considerably simplifies and sensibly complements the application control.
Memebrane Switch with integated windows
Depending on the requirements and optical design, it is possible to specify versions such as glossy, matt, anti-reflective, scratch-resistant, UV-resistant and colored for the viewing windows of the LCD and LED.
The Duraswitch © technology enables the integration of push buttons with tactile feedback, rotary encoders (rotary encoders and analog potentiometers) and cursor controls. Compared to separate solutions, the integrated solution is much more cost-effective.
For reinforcement, the membrane keyboard can be mounted on various carrier plates. As standard, aluminum plates may be used with fastening bolts.
- EMC protection: All keyboards can be provided with appropriately printed masks to comply with the requirements for electromagnetic shielding.
- IP ratings: To ensure use in extreme environments that are dust or water intensive, IP65 rated protection is required.
On the basis of your sample, your specification or technical drawing, we will create an individual offer and support you during the project.
We advise you on the selection of suitable materials and offer cost reduction options. We offer you an active co-operation in the development and construction and give suggestions for improvement.
For a technical consultation please contact us by phone: +49 (0) 2154 - 81250. Also a personal meeting in our office or at your place is possible by appointment.
For an offer we need:
- technical drawing, sketch or pattern
- technical specifications, equipment extras
- required amount
Please send following informations to: firstname.lastname@example.org
One of our engineering experts will contact you asap.
Of course, you can also use our contact form