Author Topic: ~ Types Of Computer Keyboards ~  (Read 109 times)

Online MysteRy

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~ Types Of Computer Keyboards ~
« on: August 10, 2018, 01:17:14 PM »

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Re: ~ Types Of Computer Keyboards ~
« Reply #1 on: August 10, 2018, 01:18:37 PM »



Membrane Keyboard

• A membrane keyboard is a computer keyboard whose "keys" are not separate, moving parts, as with the majority of other keyboards, but rather are pressure pads that have only outlines and symbols printed on a flat, flexible surface.

There are two types of membrane-based keyboards:

1. Flat-panel membrane keyboards

• Flat-panel membrane keyboards are most often found on appliances like microwave ovens or photocopiers.

•A common design consists of three layers.
a. The top layer has the labels printed on its front and conductive stripes printed on the back.
b. Under this it has a spacer layer, which holds the front and back layer apart so that they do not normally make electrical contact.
c. The back layer has conductive stripes printed perpendicularly to those of the front layer.

2. Full-travel membrane keyboards:

• Full-travel membrane-based keyboards are the most common computer keyboards today. They have one-piece plastic keytop/switch plungers which press down on a membrane to actuate a contact in an electrical switch matrix.

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Re: ~ Types Of Computer Keyboards ~
« Reply #2 on: August 10, 2018, 01:19:46 PM »



Scissor-Switch Membrane Keyboard

• A special case of the computer keyboard dome-switch is the scissor-switch.

• The keys are attached to the keyboard via two plastic pieces that interlock in a "scissor"-like fashion, and snap to the keyboard and the key.

• It still uses rubber domes, but a special plastic 'scissors' mechanism links the keycap to a plunger that depresses the rubber dome with a much shorter travel than the typical rubber dome keyboard.

• Employ 3-layer membranes as the electrical component of the switch.

• Shorter total key travel distance (2 mm instead of 3.5 – 4 mm for standard dome-switch keyswitches).

• This type of keyswitch is often found on the built-in keyboards on laptops and keyboards marketed as 'low-profile'. These keyboards are generally quiet and the keys require little force to press.

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Re: ~ Types Of Computer Keyboards ~
« Reply #3 on: August 10, 2018, 01:21:03 PM »



Mechanical Keyboard

• Mechanical keyswitches are more intricate and of higher quality than other keyswitch types. Each key has its own independent keyswitch mechanism that will register when a key is pressed.


Different Types of Mechanical Keyswitches

•Linear Keyswitches

•Light Tactile Keyswitches

•Quieter Tactile Keyswitches

•High Audible Tactile Keyswitches:

•High Force / Audible Tactile Keyswitches

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Re: ~ Types Of Computer Keyboards ~
« Reply #4 on: August 10, 2018, 01:22:04 PM »



Capacitive keyboard

• A type of keyboard design that uses changes in capacitance, or stored static electricity, rather than changes in flows of electricity used by contact keyboards to register when a user has depressed a specific key on the keyboard.

• Under the keyboards keys are capacitors that store electricity as opposite static charges in pairs of conductive plates made from nickel-plated copper that are separated by a non-conductive material (typically some form of plastic).

• The opposite static charges hold an attractive field between them, but the insulating material prevents the charges from canceling each other out by coming together.

• When a key is pressed, the pads move closer to each other and change the capacity for storing a charge, which the keyboard detects as a start or stop in the flow of electricity and inputs the correct keystroke.

• Capacitive keyboards are more durable than contact keyboards and are resistant to oxidization, which can weaken a keyboards mechanics.

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Re: ~ Types Of Computer Keyboards ~
« Reply #5 on: August 10, 2018, 01:22:59 PM »



Roll-up keyboard

• Keyboards made of flexible silicone or polyurethane materials can roll up in a moderately tight bundle.

• Tightly folding the keyboard may damage the internal membrane circuits. When they are completely sealed in rubber they are water resistant.

• Like membrane keyboards, they are reported to be very hard to get used to, as there is little tactile feedback, and silicone will tend to attract dirt, dust, and hair.

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Re: ~ Types Of Computer Keyboards ~
« Reply #6 on: August 10, 2018, 01:24:08 PM »



Laser projection keyboard

• A laser projection device approximately the size of a computer mouse projects the outline of keyboard keys onto a flat surface, such as a table or desk.

• This type of keyboard is portable enough to be easily used with PDAs and cellphones, and many models have retractable cords and wireless capabilities.

• However, sudden or accidental disruption of the laser will register unwanted keystrokes.

• Also, if the laser malfunctions, the whole unit becomes useless, unlike conventional keyboards which can be used even if a variety of parts (such as the keycaps) are removed.

• This type of keyboard can be frustrating to use since it is susceptible to errors, even in the course of normal typing, and its complete lack of tactile feedback makes it even less user-friendly than the lowest quality membrane keyboards.