Custom Dome Sheets & LGF (Light Guide Film)
Structure: Multi-layer composite (PET/stainless steel/conductive layer);
Actuation force range: 5-500gf (customizable);
Standard stroke: 0.05-0.5mm;
Contact resistance: < 100 mΩ (typical);
Life Cycle: ≥500,000 cycles;
Environmental tolerance: -40℃ ~ +85℃ (extendable to 125℃);
Protection rating: Up to IP68 design.
Dome Sheets & LGF (Light Guide Film) solutions represent a significant evolution beyond standard metal domes. This technology integrates a reliable Metal Dome Sheet with a precision light guide layer into a single, unified LGF Dome Sheet module. This innovative approach solves key design challenges—such as uneven backlighting, complex assembly, and increased thickness—associated with traditional backlit buttons. An LGF metal dome array delivers both crisp tactile feedback and perfectly uniform illumination, making it the ideal choice for modern interfaces where user experience and aesthetics are paramount.
| Parameter Category | Standard Range | Premium Spec | Test Standard |
|---|---|---|---|
| Force d'actionnement | 10 – 200 gf | 5 – 500 gf (customizable) | IEC 61000-4-2 |
| Travel | 0.05 – 0.5 mm | 0.02 – 1.0 mm | ISO 13732-1 |
| Contact Resistance | < 100 mΩ | < 50 mΩ | EIA-364-23 |
| Bounce Time | < 10 ms | < 5 ms | MIL-STD-202 |
| Operating Life | 1 million cycles | 5 million cycles | IEC 60384 |
| Structure | specification | Picture |
|---|---|---|
| LGF | Silver dye + diffused light film + double-sided tapeLGF+DOME SHEET |  |
| Light-blocking paper+LGF+DOME SHEET |  |
| Challenge | Problem Statement | Solution / Technology Breakthrough | Performance Achieved |
|---|---|---|---|
| Tactile Consistency Control | Batch-to-batch force variation > 15 % | Digital tooling + AI-based 100 % force inspection | Force deviation < 5 % |
| Waterproof & Dustproof | Harsh-environment reliability | Labyrinth-edge seal + nano-hydrophobic coating | IP68 (validated by 3 m submersion test) |
| Ultra-thin Requirement | Slim-device form factor | 0.08 mm ultra-thin stainless-steel dome + flexible substrate lamination | Phone side-key thickness reduced from 0.8 mm to 0.3 mm |
| Application Scenario Analysis | Environmental Requirement | Mechanical Characteristic | Electrical Parameter | Structural Constraint |
|---|---|---|---|---|
| Électronique grand public | –20 °C – +70 °C | 10 – 150 gf | < 100 mΩ | Thickness < 0.3 mm |
| Automotive Electronics | –40 °C – +105 °C | 50 – 300 gf | < 50 mΩ | IP67 protection |
| Équipement médical | +10 °C – +40 °C | 20 – 100 gf | Medical certification | Curved-surface conformal |
| Solution Tier | Substrate Material | Dome (Metal) Material | Rated Life |
|---|---|---|---|
| Economical | PET | Acier inoxydable 304 | 0.5 M cycles |
| Balanced | PEN | Acier inoxydable 301 | 1 M cycles |
| Flagship | PI | Beryllium-copper alloy | 5 M cycles |
Shanyo’s Dome Sheets & LGF provide critical benefits for sophisticated electronic designs:
Engineered microstructures within the LGF Dome Array ensure even light diffusion across the entire panel, eliminating hotspots and creating a premium, consistent glow.
Combining the switch and light guide functions into a single film module enables a remarkably slim profile, facilitating sleek, modern product designs.
As a pre-assembled unit, the LGF metal dome array reduces component count, streamlines production, and minimizes potential points of failure, improving overall durability.
The integrated Metal Dome Sheet maintains a definitive, reliable snap feel with a lifecycle of over 500,000 actuations, ensuring a high-quality user interaction.
Both the tactile dome switch layout and backlighting patterns can be fully customized in shape and effect, supporting unique branding and UI requirements.
The monolithic film construction provides a natural barrier against dust and moisture, forming an excellent foundation for achieving high IP-rated enclosures.
Shanyo's Dome Sheets & LGF can be applied to various industries and specific products.
| Application Field | Typical Use Case | Key Benefits Provided by LGF Dome Sheets |
|---|---|---|
| Électronique grand public | Smartwatch crowns, high-end remote controls, gaming controllers. | Delivers brand-defining uniform backlight and premium haptics in compact, design-driven devices. |
| Automotive Interiors | Steering wheel controls, center console touch panels, window switches. | Meets automotive-grade durability and temperature requirements while offering excellent visibility and feel. |
| Dispositifs médicaux | Patient monitor interfaces, portable diagnostic equipment. | Ensures clear, reliable operation in low-light environments; seamless surface is easy to clean and disinfect. |
| Industrial Controls & Home Appliances | Industrial HMI panels, control panels for premium kitchen appliances. | Provides a robust, reliable interface with excellent visibility in various lighting conditions. |
Shanyo collaborates with leading companies across various industries worldwide to design and manufacture dome arrays for them.
A: The key advantage is integration and performance. A traditional assembly stacks separate components (LEDs, light guide plate, rubber dome, metal dome), leading to potential alignment issues, light loss, and greater thickness. An LGF metal dome array integrates the light guide and switch into a single, thin film, guaranteeing superior backlight uniformity, a slimmer profile, and simpler, more reliable assembly.
A: Not at all. The tactile response is solely determined by the performance of the precision-engineered metal snap dome. The light guide layer is designed to coexist without interfering with the dome’s operation, ensuring you receive both perfectly even illumination and a crisp, consistent tactile click.
A: Yes. By designing independent optical channels and zones within the LGF Dome Array, and pairing it with a compatible LED driver circuit, we can achieve dynamic lighting effects including multi-color RGB, breathing patterns, and sequential illumination.
A: Absolutely. The LGF Dome Sheet module itself, being a flat film circuit, is inherently easier to seal than mechanical buttons. Using full lamination bonding, perimeter gaskets, or other sealing techniques, end products can readily achieve high ingress protection ratings like IP68.
A: To begin, we primarily need:
1) Your panel layout and industrial design, specifying desired lit areas and effects;
2) Backlight performance goals (brightness, color, LED specifications);
3) Tactile requirements (actuation force and travel for each key);
4) Environmental specs (operating temperature, required IP rating).
We will then provide a complete solution from optical simulation to functional prototypes.
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