Holland Membrane manuale d’uso

Membrane Switch Design Guide[...]

2 Introduction Membrane switch technology has become a reliable front panel solution where environmental concerns or frequent cleaning are an issue. The sealed nature of the technology coupled with its reliability and ability to offer tremendous aesthetic fle xibility make it the solution of choice for many industries. The success of any membrane s[...]

3 specify type styles, colors, and sizes of all copy. Artwork should be provided to us fo r all logos or special symbols. We use the latest version of Autocad with Autoscript to generate our drawings and artwork. It is helpful for customers to supply us with an Autocad DWG file, or as an alternate, a DXF or IGES file. Always provide Holland Namepla[...]

4 Ultraviolet Hardcoats The most durable hardcoats are those that are cured by exposure to ultraviolet light. These coatings are called UV hard-coats. Hardcoats can be selectively added to many of the materials to produce parts with a velvet textured background, and gloss or anti-glare windows. Embossing In many applications it is desirable to embo[...]

5 switch. Standard tolerances should be +/- .015". Tolerances of +/- .010 " can be held on critical dimensions such as the perimeter or cutouts. Hole center to hole center tolerances of +/- .005" can be held. Tolerances on very large parts will be greater. Tighter tolerances can be held by laser cutting or with the use of hard toolin[...]

6 considered when specifying shielding requirements. Tail Exit Point Flexible membrane switches are connected by means of a flexible tail that is cut from the circuit material. We have a great deal of flexibility in selecting the exit point. The tail cannot exit under or within .125" of the active keypad area. Interconnect The flexible tail th[...]

7 Creasing of Flex Circuits In many applications the tail of a membrane switch needs to be bent at or near the exit point. Extreme caution should be exer cised when bending flex circuits. While it is likely that continuity will be maintained in a trace that is creased sharply, the trace will most likely be damaged, and be a potential area of future[...]

8 sense to consider polyester domes if the total dome usa ge per order is expected to exceed 2500. A drawback of polyester domes is that they tend to relax and lose their tactile feel at elevated temperatures and are not recommended for applications that will experience temperatures above 55 ˚ C (131 ˚ F). Actuation Force The customer may specify[...]

9 -45 ˚ C to + 75 ˚ C (See notes on polyester domes) Life Cycle Testing Holland Nameplate performs life cycle testing to insure tha t our customers have a realistic expectation as to the typical number of cycles a particular design ca n endure. Any specific life requirements should be communicated to Holland Nameplate’s engineering department b[...]

10 that will have insertable legends. An oversized pocket is put behind this clear area so that the legend card can be inserted and seen through the window. The entire overlay has the same texture, which helps hide the fact that legends are being viewed through a window. The diffusing properties of the texture are not a problem for vi ewing the leg[...]

11 Always clean the surface before installing a membrane switch. If alignment is difficult, we recommend that you remove a small corner of the backing, align the membrane switch, stick the corner down, bend back the membrane switch and rem ove the rest of the liner. NEVER bend a membrane switch in an LED or dome area. After the membrane switch is c[...]

12 of the membrane switch. A sample of a simple drawing of a membrane switch is included in Appendix “C”. Appendix “D” is a glossary. Holland Nameplate Overlay Material Guide Appendix A Product ID Manufacturer Base Film Hardcoat Fini sh Embossable UL Rating Texturable Thickness Melinex 561 ICI Polyester No Gloss Yes No Rating Yes .005"[...]

13 Holland Nameplate Membrane Switch Checklist Appendix B The following items need to be comm unicated to Holland Nameplate before an order can be processed. ___ Mechanical dimensions of the finished pa rt ___ Tolerance specified (+ /- .015") Type of switch ___ Non Tactile ___ Tactile with stainless steel dom es ___ Tactile with polye ster dom[...]

14 ___ Customer Specified Shielding ___ None required ___ Printed silver grid ___ Printed carbon ___ Aluminum foil ___ Other ___________ _____ Overlay Material ___ Velvet textured polycarbonate (8B3 5) ___ Gloss polycarbonate with hardc oats (8010) ___ Velvet textured polyester with hardcoat ( Autotype) ___ Gloss polyester with hardcoats (Autoflex)[...]

15 Embossing ___ Key rims ___ Plateau ___ LED windows Hydroforming ___ Key rims ___ Plateau ___ LED windows Insertable legends ___ Not required ___ Specified Support panel ___ LED windows ___ Not required ___ Drawing includ ed with material specified Artwork ___ Holland Namep late generated ___ Customer supplied (attac hed to order) ___ Colors spec[...]

16 Color matching ___ Custom (samples supplied) ___ Pantone Matching S ystem ___ Federal Standar d No. 595a ___ Copy size, style, and location specified Switch Sealing Requirements ___ Standard splash resistant ___ NEMA 4 Switch Venting Requirements ___ Standard internal venti ng ___ Externally vented[...]

17 Membrane Sample Appendix C[...]

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22 Glossary Appendix D Actuation Forc e- The maximum force measured pr ior to or including the point at which keypad contact closure is achieved. Alodine- A chemical conversion process that oxidizes alum inum to form a non-porous aluminum oxide. Referred to as “poor-man’s anodizing” because it is less costly and not as durable as anodizing. A[...]

23 Over lay- Top layer of a membran e switch (the graphic interface between devic e and user) generally made of polyester or polyc arbonate. Pad Emboss- A raised area on an overlay, which defines an entire graphic. (i.e., a full keypad of L.E.D. wind ow.) Proof- A paper simulation of what a screen printed overl a y will look like, submitted to a cu[...]