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Flat
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Embossed Dome
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Metal Dome
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Membrane Plane
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Integrated LED
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Membrane Switch Quote Request Form
What
is a Membrane Switch?
A membrane touch switch is a self-contained
printed keyboard.
It is basically a wafer
thin, three-layer component.
On top is a clean polycarbonate film with the graphics and conductive
pads printed under the surface.
The middle
layer is a polyester film which acts as a spacer with cut outs for
the switch areas.
On the bottom, there
is either another polyester film with the switch contacts and interconnections
printed in conductive ink on the top surface, or a printed circuit
board with the switch contact and interconnections etched into it.
Contact is made by manually pressing the top layer against the bottom
layer.
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Features
and Advantages
1. Perfectly sealed, water-proof keyboards
which can be used in all working conditions.
2. Low cost & high reliability
3. Ease of custom design
(size, shape & color)
4. Very slim & flexible
5.
Compact assembly & combined function
6.
Embossed and metal dome available
7.
Embedded SMD LED available
Applications
All data entry functions,
including:
Appliances, Telephones, Calculators,
Office equipment, Entertainment systems, Industrial controls, Electronic
games, etc.
Basic
Structure
MEMBRANE
STRUCTURE
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FLAT TYPE |
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METAL DOME TYPE |
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EMBOSSED DOME TYPE |
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SPECIFICATIONS
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Item |
Typical Characteristic value |
Electrical
characteristics |
Contact resistance |
100 Ohm or less |
Insulation resistance |
100M Ohm or more at 100V
DC |
Withstand voltage |
125V AC for 1 minute |
Contact bounce |
15m sec or less |
Mechanical
characteristics |
Operation load |
50~300g |
Stroke |
more than 0.1mm |
Environmental
Properties |
Operation life |
Over 1,000,000 cycles |
Operating
temperature
and humidity |
-10¡É+50¡É at 90% RH or
Less |
storage temperature |
-25¡É+70¡É |
LIFE TEST DATA
Parameters |
Test Conditions |
Heat resistance |
70¡É for
240 Hrs |
Low temperature resistance |
-40¡É for
240 Hrs |
Moisture resistance |
40, 90-95% Rh for 240
Hrs |
Temperature cycle |
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Sulfide resistance |
3PPm
hydrogen sulfide at 40¡É, 75% for 96 Hrs |
Vibration resistance |
MIL-STD-202E, 201A 10-55Hz |
Impact
resistance |
MIL-STD-202E,
205E 30G |
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