Resistive track printed on PET foil
Hoffmann + Krippner capacitive switches are exceptionally robust and ideal for high mechanical stress.
Capacitive input systems are resistant to acids, dirt and other contaminants. This prevents mechanical wear of the contacts, makes for easy cleaning, ensures maximum hygiene standards and guarantees high chemical resistance (for example when placed behind glass).
The even surface allows for comfortable handling without pressure and using only slight touch. The missing tactile feedback can be replaced by optical, mechanical and/or acoustic signals.
The technology allows for flat designs and is applicable behind glass, plastic or other non-conductive surfaces. Keys in any shape are possible.
The switch surface consists of two layers isolated from each other (transmitting and receiving electrode). Short bursts are given off the transmitting electrode. These charges go to the receiving electrode through the front (dielectric) and are added up in a sampling capacitor.
When the operators finger touches the surface, the finger itself forms an additional capacitor. The finger gathers electric charges and reduces the original amount of charges sent towards the sampling capacitor. This operation is detected and interpreted as a switch operation. Digital filters and adapted algorithms ensure that glitches as well as changes in the environment (rain, mist, etc.) do not lead to any malfunctions.
Resistive Switches by Hoffmann + Krippner are ideal for medical applications or environments where the prevention of accidental activation is critical. They guarantee a continuous operation with hermetically sealed switches in sensitive application environments, such as food or medical technology who require sealed, washable and hygienic surfaces. Working much like a capacitive switch, the resistive touch switch requires actual physical pressure. Operation with heavy duty gloves is possible.
Encoders or rotary knobs have always been integrated through a hole in the front plate, representing a weak spot in the system.
a resistive circuit integrated into the membrane foil we create a fully sealed system and the ability to clean and sanitize has been maximized.
For more information, please visit www.sensotouch.com.