Membrane Switch Catalogue - Bergquist Company - #15

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More Choices Mean Better Solutions
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.
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
Polyester - Offers long life and
chemical
I resistance; 7 mil std.
• Polycarbonate - with velvet texture; 7 or 10 mil std.
Hardcoats
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
• 
uioss, semi-gioss, ; finishes are available
nd matte
ouiiace moi components
nt and feed-through
• 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
• 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
most common
Involving us early in the design
stage allows us to make
sugges-
tions that help ensure a reliable membrane switch
Polyester Domes
PC Board HeatSeal Membrane Switch
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"
Shielding
Screened silver grid - applied
to
top side of silver circuit for ESD protection
13

pageCatalog pdf di En 2012-02-07-15