Please enable JavaScript.
Coggle requires JavaScript to display documents.
output devices (printers (Inkjet (A print head which consists of nozzles…
output devices
printers
Inkjet
A print head which consists of nozzles which spray droplets of ink on to the paper to form characters
An ink cartridge or cartridges; either a group of cartridges for each colour (blue, yellow and magenta) and a black cartridge or one single cartridge containing all three colours + black (Note: some systems use six colours.)
-
-
-
Laser
Use dry powder ink rather than liquid ink and make use of the properties of static electricity to produce the text and images. Laser printers print the whole page in one go (inkjet printers print the page line by line).
Their advantage is the speed at which they can carry out large print jobs (e.g. 2000 leaflets) and the fact that they do not run out of ink halfway through.
-
3D printers
3D PRINTERS are primarily used in COMPUTER-AIDED DESIGN (CAD) applications.
They can produce solid objects which actually work.
The solid object is built up layer by layer using materials such as powdered resin, powdered metal, paper or ceramic powder.
Direct 3D printing uses inkjet technology; a print head can move left to right as in a normal printer. However, the print head can also move up and down to build up the layers of an object.
Binder 3D printing is similar to direct 3D printing. However, this method uses two passes for each of the layers; the first pass sprays dry powder and then on the second pass a binder (a type of glue) is sprayed to form a solid layer.
-
2D and 3D
A three-dimensional (3D) laser cutter works in a similar way to a two-dimensional (2D) cutter. The main difference is that the 3D cutter can recognise an object in the x-y-z direction rather than just x-y.
-
It is interesting to contrast this method of shaping objects with 3D printers, although it is true to say that not all the materials which can undergo 3D cutting can be used in 3D printing methods.
Actulator
-
-
An actuator is an electromechanical device such as a relay, solenoid or motor.
Loudspeaker/headphones
Sound is produced from a computer by passing the digital data through a DIGITAL TO ANALOGUE CONVERTER (DAC) and then through an AMPLIFIER; finally the sound emerges from a (loud) SPEAKER.
The sound is produced by voltage differences vibrating a cone in the speaker housing at different frequencies and amplitudes.
-
LCD and LED monitors
-
This means that the front layer of the monitor is made up of liquid crystal diodes; these tiny diodes are grouped together in threes or fours which are known as pixels (picture elements). The three colours which are grouped together use red, green and blue diodes. Those systems that use groups of four include a yellow diode – this is said to make the colours more vivid.
LCD doesn’t emit any light, so some form of back-lit technology needs to be used.
Projectors
two types
LDC projector
These are older technology than DLP. Essentially a high-intensity beam of light passes through an LCD display and then onto a screen. How this works in principle is described below.
-
2.This beam of light is then sent to a group of chromatic-coated mirrors; these reflect the light back at different wavelengths.
3.When the white light hits these mirrors, the reflected light has wavelengths corresponding to red, green and blue light components.
4.These three different coloured light components pass through three LCD screens; these screens show the image to be projected as millions of pixels in a grey scale.
5.When the coloured light passes through the LCD screens, a red, green and blue version of the grey image emerges.
-
-
Projectors are used to project computer output onto larger screens or even onto interactive whiteboards. They are often used in presentations and in multimedia applications.
