Solutions Details

Home solutions

FPC Membrane Switches in Lunfeng Techonology

2025-07-18

latest company case about FPC Membrane Switches in Lunfeng Techonology 0

Introduction
FPC membrane switches are key in modern electronics, merging user interface functions with durable, lightweight designs. Found in medical devices, consumer electronics, and industrial controls, they use a layered structure to sense pressure inputs. With flexibility, customizability, and environmental resistance, they outperform traditional mechanical switches. Below is an overview of their working principle, structure, and advantages.
Basic Structure
FPC membrane switches have multiple layers:

Graphic overlay: Top layer (PET/polycarbonate) with printed icons, protecting internals and enabling user interaction.
Adhesive: Pressure-sensitive, bonding layers while retaining flexibility.
Circuit layer: Core with polyimide substrate and etched copper/silver conductive traces.
Spacer: Polyester film with air gaps, separating circuits to avoid accidental contact.
Bottom circuit/support layer: Rigid/flexible backing for structure; often includes connectors for external devices.

Working Principle
Operation relies on closing an electrical circuit via pressure:

Actuation: Pressing the overlay collapses the spacer’s air gap, bringing top and bottom circuits into contact.
Circuit closure: Conductive traces meet, sending a signal to the device controller.
Tactile feedback (optional): Domes under the overlay provide a "click" for better user experience.
Signal transmission: The FPC’s circuit tail (often with a ZIF connector) sends signals to the PCB.

Polyimide allows repeated flexing, suiting curved/compact designs. Unlike capacitive screens, they need physical pressure, ensuring reliability in high-interference environments.

Materials and Customization

Materials: Polyimide (thermal stability/flexibility), silver/copper traces (low resistance/durability), PET overlay (abrasion/UV resistance), and adhesives (long-term bonding).
Customization: Options include backlighting, embossing, and varied thicknesses for ergonomic/aesthetic needs.

Advantages

Durability: Withstands millions of uses (minimal wear).
Lightweight/thin: Ideal for portables.
Environmental resistance: Sealed against moisture, dust, and chemicals.
Cost-effective: Simplified assembly cuts production costs.
Design flexibility: Fits curved surfaces and complex layouts.

Solutions Details

Home solutions

FPC Membrane Switches in Lunfeng Techonology

2025-07-18

latest company case about FPC Membrane Switches in Lunfeng Techonology 0

Introduction
FPC membrane switches are key in modern electronics, merging user interface functions with durable, lightweight designs. Found in medical devices, consumer electronics, and industrial controls, they use a layered structure to sense pressure inputs. With flexibility, customizability, and environmental resistance, they outperform traditional mechanical switches. Below is an overview of their working principle, structure, and advantages.
Basic Structure
FPC membrane switches have multiple layers:

Graphic overlay: Top layer (PET/polycarbonate) with printed icons, protecting internals and enabling user interaction.
Adhesive: Pressure-sensitive, bonding layers while retaining flexibility.
Circuit layer: Core with polyimide substrate and etched copper/silver conductive traces.
Spacer: Polyester film with air gaps, separating circuits to avoid accidental contact.
Bottom circuit/support layer: Rigid/flexible backing for structure; often includes connectors for external devices.

Working Principle
Operation relies on closing an electrical circuit via pressure:

Actuation: Pressing the overlay collapses the spacer’s air gap, bringing top and bottom circuits into contact.
Circuit closure: Conductive traces meet, sending a signal to the device controller.
Tactile feedback (optional): Domes under the overlay provide a "click" for better user experience.
Signal transmission: The FPC’s circuit tail (often with a ZIF connector) sends signals to the PCB.

Polyimide allows repeated flexing, suiting curved/compact designs. Unlike capacitive screens, they need physical pressure, ensuring reliability in high-interference environments.

Materials and Customization

Materials: Polyimide (thermal stability/flexibility), silver/copper traces (low resistance/durability), PET overlay (abrasion/UV resistance), and adhesives (long-term bonding).
Customization: Options include backlighting, embossing, and varied thicknesses for ergonomic/aesthetic needs.

Advantages

Durability: Withstands millions of uses (minimal wear).
Lightweight/thin: Ideal for portables.
Environmental resistance: Sealed against moisture, dust, and chemicals.
Cost-effective: Simplified assembly cuts production costs.
Design flexibility: Fits curved surfaces and complex layouts.

Metal Dome Membrane Switch

PET Membrane Switch

Flat Membrane Switch

Waterproof Membrane Keypad

LED Membrane Keypad