| Self-adhesive PCB Keyboard |
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Most popular(least complicated) form of membrane keyboard application is to direct affix it on the device cast. Electric circuit is made on the 0,15-0,2mm laminate, which provides little thickness of full keyboard (from 0,9mm). This allows the keyboard to fit most casts available on the market (keyboard hollow is about 1,0-1,5mm)
Keyboards may have:
Keyboard construction
It contains printed inscription with keys description. It is brand new transparent , so it's possible to bring there effective graphics in any color. For additional aesthetic effect, keys can by embossed in the shape of rectangles, meniscus etc. Foil can be brand new dull or shiny. In the second case it's possible to use keyboard LCD displays, which lose it's readability when we are talking about dull foil. Overprint is applied form below. When we connect that, with the hardened outer layer - it ensure abrasion high durability in the use process. In the case of shine foil, the only layer that is carry from the front side is anti-reflective dull layer hardened with UV. contact plate (spring ) It's one of two main electrical contact elements. It's made from high quality spring steel. Underside of that steel is covered by gold layer. That ensures optimum protection from corrosion and minimal resistance. Plates also have a mechanical function, so it's multiple bending resistance is crucial for contact work.
It's almost typical PCB circuit. Small thickness and underside adhesive layer allows affixing it on the case. electrical connector The most popular solution is the IDC coupling clasped on the AWG28 tape. It's possible to use other connectors. In particular - to maintain compatibility with foil keyboard - you can use single-row connectors (ML type, see irga-connectors.pdf) LED We use ultra thin LED, which are used successfully in laminate based constructions (thin or thick). Recently in our offer, we have super thin LED numeric displays. |
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