Презентация на тему Printer and scanner

information from a computer onto paper, or, as they

say in the "computer" language to a solid support. At the same time he called the information transfer process printing, and the resulting document - printing.

PRINTER

the types of printers used today) was invented by

the Japanese in 1964.
It works, in general, is simple. The image on the sheet is created by the print head, consisting of a set of needles (matrix), which are driven by electromagnets.

Matrix printer

of office and the scope of more modern devices

are still used in some areas. Thus, printing sales receipts based on such a principle.
Low quality, similar to the typewriter, no longer allows the use of matrix devices in other areas. Furthermore, among the disadvantages of data printers - low-speed printing and noisy work.

to the action of the matrix: the image is

created from points. Only heads with needles instead of matrix used in these (head), which prints the liquid dyes.

Jet printer

and office equipment);
oil (used for industrial marking);
pigment (the best

option for high-quality images - photos, for example);
Solvent (used for printing outdoor advertising, posters, stands as resistant to water);
thermal transfer (with the help of their image is put on the clothes).

technology) appeared in 1938. This printing method, called electrography

first, then - xerography and today more commonly known as laser printing, designed for speed, efficiency and high quality print.

Print speed is significantly higher than that in the ink jet printer (even personal laser printer - 10-20 ppm).

The advantage of the laser printer is also its ability to print on virtually any paper, without losing as a fingerprint.

Laser printer

LED printer. Their difference - in the source of

light. Instead of a single laser beam - a whole line of LEDs. Each point corresponds to a line in the LED, so the light source does not move, unlike the laser technology.

This - the first advantage: less mechanics - the higher the level of reliability. The second advantage - High Speed ​​(40 ppm). In addition, the print quality is higher than that of the laser printer, since there are no jitter distortion.
However, there is an LED printer is one significant drawback - the high cost.

the speed of their work has been and remains

the highest among all existing printers.
It got its name due to the main element - the drum equal to the width of the sheet, with relief image of letters and numbers.

Drum printers

PRINTERS

Flap (or chamomile) printers on

the principle of operation is similar to the drum, only a set of letters located on the floppy disk petals, which rotated.
The desired tab pressed against the ink ribbon and paper, leaving an imprint. Get color imprint could be putting a tape of another color.

is on paper into electronic format.

user-friendly. Flatbed scanners are capable of providing high quality

and reasonably good scanning speed. In appearance reminiscent of the tablet.
If you open the scanner cover, the inside is transparent glass and underneath the scanning mechanism. The object to be scanned lies down on the glass scanning surface. The lid must be closed.

object that you want to scan the user must

be moved manually. The only advantage of these scanners is low cost. But handheld scanners have a lot of shortcomings:
Low resolution;
Low scan quality (image may be skewed because the scanner manually moved at a constant speed rather problematic);
Low speed;

documents. In contrast to the flatbed scanner scans it

is carried out face up. Book scanners provide excellent scan quality, and even able to smooth out distortions, which are inevitable in the excesses of the book.

with the object of being scanned, so they are

designed primarily for documents that are easily damaged. It may also be used for scanning books.

They are used in the printing industry.

the bar code of the product.

this scan the real object is digitized and obtained

three-dimensional computer model of the object.

the study of internal organs.