A scanner is a device that is used to duplicate or scan printed documents like photographic prints, posters, magazine pages, pages of text, and similar things.
In other words, a scanner is an input device that is used to scan images, and texts and converts them into a digital format.
The digital format of the image or text can be shown on electronic devices like computers or mobile phones screens.
A scanner is a common device nowadays. You can find it in many offices, commercial or non-commercial organizations, school-colleges, and so many sectors.
The scanner is now used for various purposes such as industrial design, reversed design, test and measurement, gaming and other applications, resolution, color gradation, and value structure.
Types of scanner
It is said that modern printers are the digital and updated version of early fax and telephotography input devices of the 19th century.
At that time, scanners can only operate black and white results as output and the entire process was too much complicated. Because of modern science, printers are not the same thing as it was before.
It includes more functions and working capacity that provides us full control not to scan whatever we want but how we like to present the document.
The modern printer comes with many variations and each type of them are used for different purposes. Here are described all of them below,
It is an industrial scanner type and is used for high industry level scanning operations. That is not enough about drum scanners, from all traditional scanner types, drum scanners can result at a very high-resolution rate.
When another scanner’s optical resolution is not more than 2400 PPI, the drum scanner provides output results at 24000 PPI.
The reason for its name as it is made with a clear acrylic cylinder, and a drum on which the original artwork is mounted for scanning.
Drum scanners are so popular because of its controlling ability of the sample area, resolution, detail, sharpness, color rendition, and independent aperture size.
Although, drum scanners are considered as a remarkable update of flatbed scanners and there are only a few manufacturers that industrially manufacture drum scanners.
With a flip-up and cover and a small shape, flatbed scanners are only taken spaces in your desktop table and it is the most commonly used scanner type.
Flatbed scanners are also known as a reflective scanner as it scans by reflecting light onto its object that is kept for the scan.
It has a glass plate under the flip-up cover on which the object lies and the light is thrown on the glass to read the entire object.
It gets the name as it mainly scans flat objects like pages, images, and others.
It comes with a size smaller than a flatbed scanner and its working system is also similar to a flatbed scanner.
But in a flatbed scanner, the document is fed through the scanner and moves along the beam to be read when the beam moves along the document in a sheet-fed scanner.
However, this type of scanner is not perfect to scan books or large paper types. But you can freely use it for loose papers as it includes a tray to scan a large stack of single paper documents.
Handheld scanners are great to scan without a computer. This type of scanners are designed like a portable device that you can take it anywhere you want.
The function of a handheld scanner is very simple, you have to just move the device over the object you need to scan. The device can read documents on which it is seeing and also can store the data in its storage.
A handheld scanner is run with a battery power source and offers the system to transfer your document from its internal storage to your computer. But they can’t provide much quality type scanning documents like others.
How does a digital scanner work?
Scanners that are used in most of the offices or institutions work in the same way. They all come with a glass plate and a light source.
The operation starts by shining light at the object or document being digitized and directing the reflected light onto a photosensitive element.
There is an electronic light-sensing integrated circuit which is known as a charged coupled device (CCD). It can be found in most scanners that lay on the light-sensitive photosets arrayed along with the CCD convert levels of brightness into electronic signals.
Then the electronic signals are processed into a digital image which we can see on our device as a scanned document.
Besides, two other scanning technology are also used in scanners that are Photomultiplier Tube (PMT) and Contact Image Sensor (CIS). Among them, CIS is a newer technology and PMT is a function that is only used in drum scanners.
How to choose the best scanner?
There are some important issues that you need to consider when you go to the market for buying a scanner. Although, you can find so many positive reviews and suggestions of scanners online and can choose the best one easily.
For your convenience, we are showing here some scanning options that you should check before opting for one permanent option.
When we are talking about the best scanner that comes with the highest scanning ability of the device. If you search, you will get so many scanners at different speeds. Check which one can scan the highest number of paper per minute and image per minute.
Simplex or Duplex?
If you want to scan documents that are printed on both sides, then you need a duplex scanner. The duplex scanner comes with an automatic document feeder.
Each scanner has a different optical resolution that refers to the number of dots per inch it can cover. If you are buying a printer for personal purposes, then 600 dpi is fine. But you may need a higher resolution if you work with photos.
This article will help you to buy the best scanner device out in the market. Just keep sure you have checked the issues described above before buying.