As surprising as it may seem today that the precursor propagating at the present time, the scanner has roots that reach mid-nineteenth century. In the mid-fifties of the XIX century Italian physicist and inventor Giovanni Caselli invented the Pantelegraph , an ingenious device that could produce simple drawings with ink “scanning” them electrically charged stylus which allows you to transmit pulses of electrical energy to the distant device with a cable wired connection. Second, the organization received pulses of electrical energy and used the charge for ejection of ink blue, exactly recreating the original pattern.
The scanner as we know it today, is a device that captures digital images that can be stored and played back countless times, from the mid-20th century. The first functional scanner connected to a computer was a drum scanner , a device that uses acrylic cylinder in which when scanning a document or photo that will be scanned. The cylinder is rotated from a series of optical elements called fotopowielaczami that capture the contrasts and colors spinning in front of them images that accurately reflect image.
While the scanner mechanism is still sometimes used, especially in the case of photographic negatives or other applications specialized, was largely replaced by scanners flat , that utilize a flat sheet of glass or other transparent material and glowing light to capture the image, document, image or object. Flatbed scanner detects the reflection produced by the light to reproduce colors, contrast and shapes or patterns of the scanned image.
Today often, the camera plays the role of scanner used, several years ago, and many smartphones can now use the built-in camera to create a real scale scanning is almost indistinguishable from the scanner created in the selected block. Having said that, to create a truly high quality, crisp and clear images, the actual image scanner is still the ideal choice. And these blocks are large and bulky, or difficult to use. Portable scanner comes in two main variants: in the roller-fed point via flat documents, such as photographs or receipts may be transferred, and the slide-over (aka manual) scanner that passes over the surface of the object, go to be checked over his arm.
Who needs a portable scanner?
A portable scanner may seem to some people a luxury, and as an absolute necessity for others. There is a chance, but it is good that almost all actively participating in the modern world can find at least a few minor uses for a portable scanner.
For those involved in law enforcement , work kryminalistyczną or research jeep of almost any type, a portable scanner can significantly simplify the work of this investigation and data collection. Imagine the benefits offered to the detective that it can copy the files found at the crime scene, and at the same time, maybe leave them as they were during the stay. Or imagine an archaeologist, which captures high definition images of the wall of hieroglyphics or sign klinową using a handheld scanner without breaking even the ancient dust was lying on top of his findings.
Of course, most people use a portable scanner in a much more customs purposes, although makes it no less useful. A portable scanner is a big advantage for those who has access to human resources or recruitment who wants to quickly copy cards and / or resumes of potential clients or new clients that I meet. A portable scanner is a great advantage for people occupying the position at the exhibition work, for example, when the whole set of equipment, which is usually in the office, should be left.
Also portable scanners can be useful for the trader, away from his Desk who wants to scan receipts to the expense report, copy the document to review and edit later, and even for Shen operator who secretly wants to copy you competitor wants to play.
The choice of a suitable portable scanner for You
Price range can vary greatly depending on the mobile scanner, so you need to consider their specific needs before beginning to take into account specific devices, to avoid the reluctance of purchases caused by the shock. Not all portable scanners are equal, and not all of them are able to perform the same tasks, so choose wisely, and received if necessary.
If Your primary desire portable scanner the copying of photos , you must select a device capable of stable scanning with high resolution, which minimize blur. There are compact scanners , which are best suited for this purpose, and device with a feed roller that will be suitable, if not ideal.
Scanning simple documents such as receipts or business cards, where important information, but does not have the ability to play the appearance of your document, you can choose a handheld scanner or a device with a roller feed mechanism. Unit with feed rolls, ideal for scanning full-sized paper documents with a diagonal of 11.5 cm (or paper ) , which really needs to be accurately reproduced for subsequent re-print and / or review.
A handheld scanner is probably the most user-friendly as possible, and can create quick snapshots with minimal disruption to the document or object. But also create an image about the quality which is the subject of the use of unstable hands, and often in small areas of the scan range. These devices are well suited for fast retrieval of information and can serve people in many areas of life.