keypad design

Keypad Design

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1. Keytop A non-conductive, silicone rubber pushbutton, with or without printing.

2. Web The flexible �moving� non-conductive rubber part. The web�s shape affects the operating reliability and tactile response feeling of the switch.

3. Key base or pad A single rubber sheet that contains one or more keytops/switches	Number of Keys Overall dimensions mm Number of cut-outs

4. Conductive Pill The current carrying conductive silicone portion of the rubber switch which �bridges� a contact circuit on the PCB. Note: Other contact materials available for special design.

5. Travel The distance required to depress the rubber keytop to complete electrical connection between conductive pills and printed circuit board.

6. Hardness The hardness of rubber is measured in durometer. The higher the durometer, the harder the material and the higher force of keypad.

7. Force or Peak Force The minimum force value required to collapse the web of the keypad.

8. Click ratio The difference between peak force and the return force of a rubber key pad. Expressed as a % of peak force. This characteristic is caused by the sudden collapse of the web of key pad. The degree of snap is a function of force and travel.

9. Volume Resistivity Electrical resistance within one centimetre square of conductive material. Expressed as Ohm - Centimetres.

10. PCB Printed circuit board.