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| | | More Choices Mean Better Solutions | | |
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| | | Bergquist offers a wide variety of choices in how your HeatSeal membrane switches can look, feel and function.This page shows many of our standard features, available options and an inside look at what makes a higher quality switch. | | |
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| | | GRAPHIC LAYER Materials | | GRAPHIC ADHESIVE • 5 mil standard thickness SWITCH CIRCUIT LAYERS (top and bottom) Switch Types • Screened silver circuit - most economical; for switching loads one watt or less; typical top and bottom layer thickness is 5 mil | | |
| | | Aluminum and gold vapor deposition - ESD, EMI and RFI protection; adds approximately 5 mil to total thickness | | |
| | | PC board components • Standard PC board thickness from 0.030" to 0.125" • Stainless steel snap domes - used on nickel-plated copper or PC boards; for tactile feel and temperatures above 150°F | | |
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| | | Polyester - Offers long life and
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| | | chemical | I resistance; 7 mil std. | | |
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| | | • Polycarbonate - with velvet texture; 7 or 10 mil std. Hardcoats | | |
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| | | SPACER LAYER • HeatSeal - internally vented preferred for most applications (PSA available - externally vented) • 6 - 8 mil thickness typical when using polyester domes • 6 - 14 mil thickness typical for flat switch • Spacer thickness depends on actuation force requirements back lighting • Electroluminescent lamp • Fiber-optic • LEDs - soldered on PC board switches | | |
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| | | • | uioss, semi-gioss, ; finishes are available | | nd matte | | |
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| | | ouiiace moi components | | nt and feed-through | |
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| | | • Increases chemical and scratch resistance • Selectively applied to create display windows and decorative finishes Colors • Pantone (PMS) or custom matching using a color computer • Transparent/translucent colors for back-lighting and windows • "Deadfront" available to hide leg ends/windows until back-lit Embossing • Tactile formed graphic over flat circuits (typically most cost- effective) • Pillow embossing - 0.015" typical height; generally used over polyester domes • Rim embossing - 0.010" typ. height; for locating pads by feel | | |
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| | | • PC board - copper circuitry for switching loads greater than one watt, or when components (LEDs, displays, etc.) are used Circuit Types • Matrix and short-to-ground are | | | BACKERS OR ENCLOSURES • Metal, FR4 or polycarbonate backers • Plastic enclosures | | |
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| | | most common | | |
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| | | Involving us early in the design
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| | | tions that help ensure a reliable membrane switch | | |
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| | | Polyester Domes | | |
| | | PC Board HeatSeal Membrane Switch | | |
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| | | Formed into top switch circuit layer of silver circuit switches Formed into shunt/dome cover layer of PC board switches Provides tactile feel and long life; typically 24 - 30 mil height | | |
| | | Graphic Layer GraphicAdhesve Mylar Shunt or Dome Cover Layer Stainless Steel Domes HeatSeal Spacer .Lighting PC Board standard thickness from .030" to .125" | | |
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| | | Shielding | | |
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| | | Screened silver grid - applied
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| | | top side of silver circuit for ESD protection | | |
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