How Does a Document Scanner Work?
The Scanner A document scanner is a vital tool for many workplaces that often work with hard copy documents. There are three major types of document scanners: flatbed, sheet-fed and hand-held. The flatbed scanner requires the user to place the document to be scanned on the top of a glass inside the machine. The image sensor within the flatbed scanner moves across the page, copying its contents. A sheet-fed scanner, which usually resembles a printer, moves the paper over the sensor to achieve the same effect. Hand-held scanners are operated by the user, requiring the user to manually move the sensor over the document in order to scan it. The CCD Sensor The image sensor of almost all document scanners is an array of charge-coupled devices. The CCD arrays work through photo-sensitive diodes. These diodes convert the light (or lack of light) they catch into an electrical signal with the same information. When scanning a document, they don’t scan for words; they scan for the lack of light b
