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Membrane Switch Design

Guide

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Summary of Contents for Membrane

Page 1: ...Membrane Switch Design Guide...

Page 2: ...ncoated polycarbonate is also susceptible to damage from a variety of chemicals If a polycarbonate overlay is going to be in an environment that will subject it to chemicals a hardcoat should be used...

Page 3: ...a color by screen printing or painting on a particular substrate The Munsell Color System identifies colors in terms of three attributes hue value and chroma The physical samples to which we match usi...

Page 4: ...s We have samples of both hydroforming and embossing on polyester and polycarbonate that will help illustrate the different results that can be attained Contact a Holland Nameplate sales engineer to r...

Page 5: ...reedom will allow us to produce a more efficient layout This has the advantage of shorter development time and a simpler circuit layout which could nominally affect switch reliability Membrane switche...

Page 6: ...ted with solder tabs that can be directly soldered onto the circuit board The AMP part number used is 88997 2 The lowest cost alternative is to use a ZIF Zero Insertion Force connector AMP and Molex b...

Page 7: ...ovides a rigid panel and allows for the easy addition of other components such as LEDs and resistors These types of membrane switches are usually supplied with a standard header with pins on 100 cente...

Page 8: ...s are in the 12 to 18 ounce range The tolerance on actuation force is 3 ounces Electrical Performance The great variety of membrane switch designs makes it difficult to outline a general set of specif...

Page 9: ...the overlay the less effect the coating will have on display readability If LED displays are within 062 of the overlay a velvet texture will usually yield acceptable readability For distances greater...

Page 10: ...y common to include small surface mounted LEDs into membrane switches This is a very simple way to add annunciators to a switch A standard membrane switch is not thick enough to accommodate the packag...

Page 11: ...rent mechanical dimensions to allow for assembly tolerances The subpanel should be 020 smaller than the membrane switch in both height and width All cutouts and holes should be 030 larger Cutouts behi...

Page 12: ...005 010 Autoflex EBA Autotype Polyester Yes Matte Yes 94 VTM2 Yes 005 010 Marnot XL Tekra Polycarbonate Yes Various Yes 94 V2 Yes 007 030 8010 Lexan General Electric Polycarbonate No Gloss Yes 94 V2...

Page 13: ...l dimensions of the finished part ___ Tolerance specified 015 Type of switch ___ Non Tactile ___ Tactile with stainless steel domes ___ Tactile with polyester domes Tail details ___ Tail exit point __...

Page 14: ...olycarbonate 8B35 ___ Gloss polycarbonate with hardcoats 8010 ___ Velvet textured polyester with hardcoat Autotype ___ Gloss polyester with hardcoats Autoflex ___ Other _________________ Logos and spe...

Page 15: ...rims ___ Plateau ___ LED windows Insertable legends ___ Not required ___ Specified Support panel ___ LED windows ___ Not required ___ Drawing included with material specified Artwork ___ Holland Namep...

Page 16: ...__ Pantone Matching System ___ Federal Standard No 595a ___ Copy size style and location specified Switch Sealing Requirements ___ Standard splash resistant ___ NEMA 4 Switch Venting Requirements ___...

Page 17: ...17 Membrane Sample Appendix C...

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Page 22: ...ly when backlit Density The degree to which light transmits through a color or transparent window The higher the density the less light will be transmitted Dielectric Strength The voltage that an insu...

Page 23: ...coverage is less than 100 simulating shading or a lighter color Selective Texture A transparent velvet finish printed on specified areas on an overlay to accentuate design elements such as windows ke...

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