OEM Supplier's Embossing 2NO2NC Push Button Switches FPC Membrane Keyboard Keypad 3M300LSE Adhesive Tactile Membrane Switches

OEM Supplier's Embossing Push Button Switches FPC Membrane Keyboard Keypad with 3M300LSE Adhesive Tactile Membrane Switches

Copper Flex FPC circuit membrane switch panels can be produced using polyester or polyimide (Kapton) as the base material, depending on your interface requirements. A very thin sheet of copper is laminated to the flexible film substrate then chemically etched away, leaving copper traces. The etching process is not environmentally friendly due to the chemicals used, and is also more expensive than screen printing the silver traces used in Silver Flex membrane switches. Copper Flex switches can be constructed as:

• Single-sided – conductive traces one side of the film substrate
• Double-sided – conductive traces both sides of the film substrate
• Multi-Layer flex – a laminated “sandwich” of numerous layers with conductive traces
• Rigid-Flex – a laminated combination of a Copper Flex switch with a rigid FR4 PCB membrane switch

FPC membrane advantages compared with silver film switch
1.Low resistance(10% of silver film switch)
2.load large current(Normally 1Acurrent/0.5mm line)
3.Components(LED and resistance)can be welded more firmly
4.Good oxidation resistance, suitable for humid environment
5.The connector at the end of cable can be made to smaller to save space.

Embedded LEDS

FPC Membrane switch panel with LEDs are still the most popular and economical method for keyboard backlighting. LEDs are most commonly used to backlight keys, icons and symbols. LEDs are also typically used as indicator lights. A combination of LEDs, Light Guide Film and proprietary  tiantai backlighting methods can be designed to backlight the entire surface of a user interface.

Silver printed PET circuit and copper etched FPC circuit

When should we use FPC as membrane switch’s circuit?

Sometimes, the membrane switch size is small, but there are many buttons and LEDs, then by the single PET circuit layer couldn’t place so many components, then can consider to use double sided FPC as the circuit layer. By the way, the FPC circuit cost is higher than PET circuit, but it also has its advantages, for example, the FPC is more stable, tough. Especially when should assemble many LEDs on the circuit, then use FPC, the quality and stability will be much better then PET circuit. Of course, this depends on customer’s requirements and decisions. If the customer no requirements, then we suggest use FPC as circuit only when it couldn’t fulfill customer’s function by PET circuit.

FPC Membrane Switch design options:

Single-sided – conductive traces one side copper of the film substrate

Double-sided – conductive traces both sides copper of the film substrate

Rigid-Flex – a laminated combination of a Copper Flex switch with a rigid FR4 PCB membrane switch

Solder active and passive components into the switch design

FPC + MEMBRANE SWITCH + RUBBER KEYPAD

FPC+MEMBRANE SWITCH+ TOUCH PANEL

PCB+MEMBRANE SWITCH

WATERPROOF MEMBRANE SWITCH

Possible pitch 0.5mm and 0.3mm for ZIF connector

Plating options can be tin, nickel, or gold

Sincerely welcome to visit our factory!!!