Tablet scanner - what is it?

Without a computer and peripheral devices that extend its functionality, do not imagine the modern world. One of them is a scanner that converts the image of material objects into a digit. It works both in conjunction directly from a PC, and autonomously, the scan result goes over the network. We'll talk about the most common types, then compare them.

Tablet

Such a device has a high functionality, ease of use, so it is in demand. When scanning the document does not need to bend, distort, scatter.

Principle of operation

A sheet of information is placed on a glass tablet, the image down. By pressing a button, we activate the carriage under the glass. It is equipped with a light source, a system of mirrors, lenses and photosensitive sensors. When moving, it projects light onto a sheet. Reflected with the help of lenses and mirrors luminous flux, take light-sensitive sensors. They, in turn, produce signals with different voltages (potential differences), which depends on the degree of illumination of different parts of the sheet. An analog-to-digital converter (ADC) converts an analog signal into a digit. Through the device controller binary code gets to the computer. Using software, the code is converted into an electronic copy of the scanned document, which we see on the screen.

With a computer, a flatbed scanner is connected via a USB port. Management is carried out using a computer program or quick control buttons on the device.

Broaching

Here the document is movable, which is pulled by the automatic feeding system through static photo cells. In the ADC, the luminous flux is converted into electrical signals of different voltages, depending on the degree of illumination. Then the signal through the device controller gets to the computer. Typically, such a scanner is part of a multifunction device with a fax machine, fax machine and copy machine.Purpose - rapid automation of the scanning process of a large amount of documentation. It is also called documentary. The inconvenience is that before scanning the document must be spreaded, removed clips, embroidered.

IMPORTANT. Often, to eliminate such inconvenience, the devices are additionally equipped with a glass tablet or it is purchased separately. This is a lingering or flow plate. This combination allows you to easily scan any document, brochure. Now he will cope with any volume of workflow.

Why choose a flatbed scanner for your home

1. He possessesis highim the quality of the result. This happens due to the static immobility of the sheet.
2. Versatility. Any sheet that can be placed on the tablet will be processed: business cards, slides, books. It's all about the size of the tablet itself. No need to fasten, embroider.
3. More efficient. In the tablet version there are fewer moving parts, as compared to the draw, which means that there is less probability of their failure. Does not require constant care, cleaning, adjustment. There is no possibility of “chewing” the original, the result depends on reducing / increasing the scroll speed.

The device must be selected depending on the tasks. For the home is better suited tablet, for the office, with a large amount of work, lingering. But the choice is always yours.