How to Laser-Etch Patterns on Light-Through Buttons Without Compromising Transparency

Achieving crisp backlit symbols on light-transmitting buttons requires precision laser technology. Standard laser etching often carbonizes the substrate, reducing light transmission by over 50%. Discover how our specialized process delivers flawless results while preserving 90%+ light throughput.


1. The Industry Challenge: Why Most Laser Marking Fails

❌ Conventional YAG lasers:

  • Simultaneously remove paint and scorch transparent plastic
  • Create light-blocking carbon layers
  • Result in:
    ✓ Uneven backlighting (30-40% transmission)
    ✓ Blurred symbols
    ✓ Reduced button lifespan

Case Study:
Automotive audio buttons lost 55% light output after standard laser processing.


2. Our Proprietary Solution

⚙️ Specialized Equipment:

  • Beam-shaping optics for 0.01mm depth control
  • Dynamic power adjustment (15W-30W)
  • 50kHz pulse frequency to prevent heat buildup

📊 Performance Comparison:

ParameterStandardOur Method
Light Transmission≤40%≥90%
Edge Definition±0.1mm±0.02mm
Heat Affected ZoneVisibleNone

3. Light-Through Button Anatomy

Optical Pathway Design:

  1. Light Guide Structure:
    • LED coupling interface (side-mounted)
    • 45° primary reflector
    • Dual-function secondary reflector (touch surface + light redirection)
  2. Laser Process Criticals:
    • Removes 5μm paint layer only
    • Maintains pristine light channels

4. Applications & Success Stories

🔘 Consumer Electronics: Phone keypads
🚗 Automotive: Dashboard controls
🏭 Industrial: Instrument panels
🏠 Smart Home: Illuminated switches

Client Result:
Global automotive supplier achieved 99.3% yield (from 72%)

Welcome to exchange more ideas with us at www.rilong-mold.com.

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