Conductive rubber keypads were developed nearly 30 years ago as a means to provide a less expensive momentary switch. This moldedkeypad alternative has grown in popularity as they can be made to lookand feel like traditional mechanical switches while eliminating some of their inherent disadvantages. Like membrane switches, elastomeric keypads can be made to resist moisture and other harsh environmental conditions.
Advantages of Rubber Keypads
Perceived higher value
Because a rubber keypad offers the 3 dimensional profile of a mechanical switch, it is typically perceived as ahigher-end product. Unique decorating options such as keycaps and epoxy coating can help enhance this highervalue option.
User friendly interface
Due to the flexible nature of rubber and the unique shapes for which it can be molded, a superior actuation feelcan be achieved with rubber keypads. This is particularly true when a keypad configuration requires a tight clusterof keys. ’Bosses’ can be molded on the underside of the rubber keypad that interface with very small metal domes creating an exceptional tactile response.
Allows for unique backlighting options
Non-tinted silicone rubber makes an excellent diffuser of light. By integrating laser etching and SMT LEDs on acircuit layer, keys can easily be backlit with a single LED.
Lower tooling cost compared to injection molding
The compression molding process used to create rubber keypads utilizes tooling that has much lower cost than that of injection molding. The typical production tool cost for a rubber keypad is between $2000-$5000. Additionally, prototype tooling options are available that often cost less than $1500.
GUIDELINES TO DESIGNING RUBBER KEYPADS will help ensure that all aspects of product design are considered as to maximize the esthetic quality, reliability, and efficiency of the final product.