IDP
manufacturers a wide range of custom silicone rubber keypads that
provide our customers with non-toxic, elastic, long-lasting and
dependable products. Our capabilities include:
Multicolored keypads
A wide range of durometers
Dual durometers keys
Screen printing
Laser etching
Robust coatings
Plastic key caps
Dual shot plastic keys
Chroming capabilities
LED windows
A wide variety of shorting pad concepts
Carbon
Copper
Typical Force/Stroke Curve
Rubber Keypad Design Considerations
Contact Design
Resistance
Printed Carbon
1,000
Carbon
200 Ohms
Life
Printed Carbon
Less than or equal to 1 million
Carbon
1 million
Typically
a carbon or gold/nickel plate over copper is recommended if the
circuitry is on a printed circuit board.The carbon will have a higher
contact resistance with improved immunity to extremely corrosive
environments.
Nomenclature Legend Typical
nomenclature is applied to the key with various methodologies. Standard
printing will meet 250,000 to 500,000 finger activations, before
showing signs of wear.
To increase cycle life,
overcoats can be added. This will increase the life to 1,000,000
actuations. In correlating this to the Norman abrasion tester, this
will exceed 500 cycles at 500grams of force.
Legends colors are matched to Pantone Colors with a tolerance of 1 shade. There are printing limitations on the distance between the legend and key edge:
- Silk Screen
.5mm minimum from edge of key
- Convex Surface
20mm minimum key radius
- Concave Surface
30mm minimum key radius
Integrated Global Solutions in Custom Manufacturing, Design, Engineering, Prototyping, Turnkey Products, Program Management, QA, Packaging & Logistics
1 million
1 shade. There are printing limitations on the distance between the legend and key edge: