“As the primary human machine interface of the equipment, a keypad must not only suit a practical purpose but contribute to the overall aesthetic design,” according to Anglia technical director David Pearson. “For this reason, the needs of individual customers can be very specific. Anglia’s custom keypads can incorporate customer logos, character legends and even corporate colours. The keypads can be specified in any shape, size or colour with options such as IP and IK ratings where products are to be used in harsh environments. The wide variety of materials on offer can accommodate most applications and budgets.”Options include keypads in silicone rubber or metal, and membrane keypads.
“Silicone rubber are economical and reliable for small, medium and large production runs,” said Anglia. “They have excellent resistance to temperature and ageing, and can be integrated with printed circuit boards or flexible circuits.”Integrated SMD LEDs in a choice of colour are an option, as is a choice of tactile or non-tactile feel keys.Metal keypads are more durable and robust, suiting them to harsher environments or where they are installed in a public place. They are inherently water and dust protected, according to the company, and their symbols can be laser etched.
Membrane Keypads are one of the most popular options, said Anglia. Due to the flush water-resistant finish they have good resistance to dirt and fluids, and are easy to clean. Individual keys on the membrane can be specified with poly-domed or metal domed switch elements giving a range of tactile feedback levels.
Membranes can also incorporate designs such as instrument dials and gauges, which can be back-lit with LEDs. They can also accommodate clear windows, allowing for displays to be mounted behind the keypad.Applications are foreseen in public terminals, industrial controls and security panels.
Source: This news has been taken from electronicsweekly.com
