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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)
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That kind of keyboard combines functions of electronic module, front plate and keyboard. Board of that printed circuit can have thickness from 1,5 to 2,5mm, which provides high formality and mechanical durability.
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PCB based keyboard has several variants. To produce them, we use several types of copper laminates, depending on the future keyboard properties.
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Technological progress, speeds up continually. Newer technologies are produced. Slightly older, are becoming cheap and widely available. We can observe this phenomenon, also in the area of interfaces(where automatics and human-operator meets). Biometric systems are created(voice recognition,using voice commands) and also various solutions that integrate image, with pointing possibility (touchscreen/touch panel). Still, however the most popular and friendly to the man is keyboard. This old invention was under huge act of the evolution. As a result, it became possible to functionally adapt this component to almost every type of device. Progress in the field of material and also electronic technology has allowed to produce this sub-assembly relatively cheap.
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Keyboards 
