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Membrane switch

 

 
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Membrane switch
 
 
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A membrane switch is an electrical switch for turning on and off a circuit. It differs from a mechanical switch, which is usually made of copper and plastic parts: a membrane switch is a circuit printed on a PET
Polyethylene terephthalate

Polyethylene tephthalate , commonly abbreviated PET, PETE, or the obsolete PETP or PET-P), is a thermoplastic polymer resin of the polyester family and is used in synthetic fibers; beverage, food and other liquid Packaging; thermoforming applications; and engineering resins often in combination with glass fiber....
 or ITO
ITO

ITO is a three-letter acronym which can stand for:* IATA airport code for Hilo International Airport* Income Tax Office — a major landmark in Delhi...
. The ink used for screen printing is usually copper
Copper

Copper is a chemical element with the symbol Cu and atomic number 29.It is a ductile metal with very high thermal and electrical conductivity....
 / silver
Silver

Silver is a chemical element with the chemical symbol Ag and atomic number 47. A soft, white, lustrous transition metal, it has the highest electrical conductivity of any element and the highest thermal conductivity of any metal....
 / graphite
Graphite

The mineral graphite is one of the allotropes of carbon. It was named by Abraham Gottlob Werner in 1789 from the Greek language ??afe?? : "to draw/write", for its use in pencils, where it is commonly called lead, as distinguished from the actual metallic element lead....
 filled and therefore conductive.

The ASTM defines a membrane switch as a momentary switch device in which at least one contact is on, or made of, a flexible substrate.

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Usage
Use in any electrical appliances in which the rebouncing feeling is not important.






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Encyclopedia


A membrane switch is an electrical switch for turning on and off a circuit. It differs from a mechanical switch, which is usually made of copper and plastic parts: a membrane switch is a circuit printed on a PET
Polyethylene terephthalate

Polyethylene tephthalate , commonly abbreviated PET, PETE, or the obsolete PETP or PET-P), is a thermoplastic polymer resin of the polyester family and is used in synthetic fibers; beverage, food and other liquid Packaging; thermoforming applications; and engineering resins often in combination with glass fiber....
 or ITO
ITO

ITO is a three-letter acronym which can stand for:* IATA airport code for Hilo International Airport* Income Tax Office — a major landmark in Delhi...
. The ink used for screen printing is usually copper
Copper

Copper is a chemical element with the symbol Cu and atomic number 29.It is a ductile metal with very high thermal and electrical conductivity....
 / silver
Silver

Silver is a chemical element with the chemical symbol Ag and atomic number 47. A soft, white, lustrous transition metal, it has the highest electrical conductivity of any element and the highest thermal conductivity of any metal....
 / graphite
Graphite

The mineral graphite is one of the allotropes of carbon. It was named by Abraham Gottlob Werner in 1789 from the Greek language ??afe?? : "to draw/write", for its use in pencils, where it is commonly called lead, as distinguished from the actual metallic element lead....
 filled and therefore conductive.

The ASTM defines a membrane switch as a momentary switch device in which at least one contact is on, or made of, a flexible substrate.

Structure of a PET


A membrane switch usually consist of 2 - 4 layers of PET:

  1. The first layer PET with circuit printed
  2. Second layer acting as a spacer can be another PET film.
  3. Third layer as a circuit closer.
  4. The front panel, a PVC or Polycarbonate layer with button pattern and picture printed


Usage


Use in any electrical appliances in which the rebouncing feeling is not important. Classic applications includes microwave oven
Microwave oven

A microwave oven, or a microwave, is a kitchen appliance that cookings or heats food by dielectric heating. This is accomplished by using microwave radiation to heat water and other dipole within the food....
 panel, air conditioner control panel, TV remote control
Remote control

A remote control is an Electronics device used for the remote operation of a machine.The term remote control can be contracted to remote or controller....
 etc. Tactile feedback of keys can be provided by embossing the top PET layer or embedding metal snap domes.