Membrane Switches

Tel: 440-232-8590
Fax: 440-232-8593
E-mail: sales@LiquidCrystalTechnologies.com

  Membrane Switches & Switch Assemblies

A Membrane Switch is a momentary switch device in which at least one contact is on, or made of, a flexible substrate. They offer a low cost and high reliability compared to other switch technologies.

Membrane switch panels give total freedom to the designer. Being light in weight and thin in construction , this ultra reliable technology has already been adopted by many industry sectors for product use in a variety of environments.

 

 

Additional Information:

1) Specifications for a typical Switch.

2) Materials used in making a Switch

Membrane Switch Options:


  • Optional Front Panel & PCB Assemblies
  • Integrated displays - LCD, LED, VF
  • Integrated backlight - LED, VF, CCFL
  • EMI / RFI shielding
  • Non-tactile membrane or
  • Tactile membrane with metal or polyester domes
  • Custom overlay graphics, colors and surfaces
  • Metal or plastic substrate

 


Typical Applications


Appliances
Industrial Machinery
Computer Products
Instrumentation
Security Systems
Marine Equipment
Medical Equipment
Telecom Equipment

 


Features


Infinite Variety of Overlays
Many Options for Tactile Feedback
Windows for LED's / LCD's
Many Surface Treatments
Alone or with Electronics
Fully Sealed Switches
Choice of Connectors
Dead Fronts Available

All of the following conditions or features must be met in order to be classified as a membrane switch:

1. Direct (Ohmic) Contact: the poles of the switch must make physical contact, i.e. can not be non-contact type like capacitive, ferrite core, or hall effect.

2. Momentary Action: Upon release, the poles immediately separate as the flexing membrane returns to its original position.

3. Low Voltage Application: A membrane switch is designed to be used in low voltage, DC logic-level-signal, applications.

4. Membrane Layer: A thin pliable layer that carries one pole, both poles or that flexes during switch operation used to short both switch poles together. 

5. Static (Insulating) Layer: Does not flex during switch operation but carries one pole, both poles or used to short both switch poles together. See figures 1.

There are two basic construction techniques:

  1. Membrane switches constructed with stainless steel domes have a stamped steel dome placed above each switch contact. Domes are available in a variety of sizes and actuating forces.

  2. Membrane switches constructed with polyester domes have domes formed into either the graphics layer or the top circuit layer. This creates the need for a custom forming tool and increases tooling costs. Because individual domes do not need to be placed above each contact, polyester domes are more cost effective when quantities are high.

Our " Membrane Switch Materials" page explains some of the material options available when ordering a membrane switch.

 

Additional Information:


Specifications for a typical Switch.

Materials used in making a Switch


Click on the Speed Quote link on the left to request a quote for a membrane keypad.