Membrane Keyboards

Industrial machine control panel with membrane keyboards integrated.

Project Description

Membrane keyboard for industrial equipment for automotive mechanical workshops.
Silk-Screen printing on polyester.
Glossy window for backlit display.
Thermoformed buttons.
Flat Flex Connector.

Project Details

Data: 2012
Customer: ELETTRA 80
Materials: Polyester media support


  • Membrane Keyboards
  • Silk-Screen Printing
  • Thermoformed buttons
  • Flat Flex Connector

Membrane Keyboards are keyboards in which the keys are not separated from each other, but are made on a single flat surface. Their appearance is coincident with the need to have an application range greater than that offered by traditional mechanical keyboards.

The operation is based on electrical contact between the keyboard surface and the underlying circuits when pressed in certain areas (keys).
The membrane keyboard works very simply, thanks to the presence of a flexible sheet where under each button there are contacts that are close to each other and are found to be discovered.

At the top, there is a very flexible rubber dome that has a conductive disk in the center. This is lowered by the effect of the pressure exerted when a keyboard key is pressed. This action closes the key of the keypad itself.

They can be connected directly to electronic equipment by a Flat Flex Connector, and consist of several layers of polyester and adhesive.

The traditional mechanical keyboard offers greater feedback and does not need a full stroke because the input is recorded at half-stroke. The two keyboard types also differ in relation to the respective drive force, which allows you to determine how many grams are enough to press a key.

Electrical Features

  • Nominal Voltage: 5 V
  • Max/Min Voltage: 30 V / 2 V
  • Max/Min Current: 40 mA /1 mA
  • Max Circuit Resistance: 100Ω
  • 100 V Insulation Resistance: 1000
  • Max Power: 1.2W

Mechanical Features

  • Drive Force: 1 ÷ 4 N
  • Button Travel:0,2/0,5 mm
  • Contacts Materials: Ag/Ag
  • Number of drives: 10.000.000
  • Vibration Proof: DIN 40046-7/8

Environmental Features

  • Working Temperature: -25 ÷ + 55°C
  • Storage Temperature: -40 ÷ + 85°C
  • Salt Spray resistance: 48 h
  • Warm heat resistance: 60 gg
  • IP Protection Class: IP65 - IP67
  • Humidity absorption at 20°C and 60 % R.H.: 0,19%

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