The more that you investigate about keyboards, in order to find the ‘perfect one for you’, the more detailed info ration you will find. Pretty early on in this process, it will become obvious to you that a keyboard’s keys, and the mechanisms below them, tucked out of site of the users, are the most important components that you will need to learn more about. The real job is learning about the switches below those keys.
The Finger points
After all, these are the points that your body actually touches any keyboard. Your fingers are the conduits that your brain signals communicate through. It doesn’t matter if you write blog posts, specialist technical journals, or simple e-mails. If you are at all uncomfortable, it is your fingers that will feel it first. Any kind of pain or discomfort you feel at the contact point will soon grow into nerve pain through your palms, wrists, arms and back.
Whether or not you are investigating moving beyond the ‘off the rack’ keyboard that comes with your working or home computer, or interested on what different products are on the market, eventually you will look at the different kind of physical keys that there are on the market, and you will be faced with a decision: Do I buy Rubber-Domed or Mechanical switches?
The Rubber-Domed Switch
The vast majority of keyboards on the market today feature a Rubber or Silicon dome that sits directly under the key that you see, and connect to the ‘works’ that lie under the keyboard, and connect between action and the letter appearing in screen.
The visible part of the key is called the Key Cap. These are relatively expensive items that must deliver a long life. However, it is the switch below it that receives all of the trauma and shock of being pressed – or hit! – Repeatedly over the life of the product. A much more cost effective method is to protect this switch with a simple rubber dome that sits under the Key Cap, and suffers the repeated shock of action time and time again.
The differences in the shape and thickness of the domes that the mass producer of your keyboard uses determines the travel distance, resistance, and tactile feedback of the switch.
Mechanical key-switches are more elaborate and made in a better quality than other key-switch types. In this system, each key has its own independent key-switch mechanism that will register when a key is pressed.
In most cases the key is actuated (the keystroke is generated, and sent to the computer) halfway through the key travel distance. For example, the key may be capable of traveling 3 mm before hitting the bottom of the key-well, but the keystroke is generated after 1.5 mm.
As there is no requirement to travel the full key travel distance when being operated, typists enjoy the luxury of not pressing keys fully down, reducing the constant jarring action on fingertips when ‘bottoming out’ and associated unnecessary muscle action. Additionally, the constant use if these types of keys offer increasing resistance after the keystroke is generated, encouraging the user to stop pressing down the keycap and instead move on to the next keystroke. Finally, keycaps snap back to the starting position (i.e. up) more quickly than other key-switch types, facilitating faster typing speeds.
Of course, Mechanical key-switch keyboards are more expensive when initially bought, but their working life is much longer. Together with the lowered risk of injury caused by repetitive stress injury, you may want to investigate a keyboard with mechanical switches for a more pleasant working experience.
Thanks to Truly Ergonomic Ltd. for the use of a picture of their ergonomic, mechanical keyboard