Different Types of Scanner Devices

The scanner is a device that optically scans images, printed text, handwriting, any object, and which converts it into a digital image. Scanner which are Commonly used in offices are variations of the desktop flatbed scanner where the document is placed on a glass window for Scanning.

Types of scanner

1. Drum
2. Flatbed
   • CCD Scanner
   • CIS Scanner
3. Film
4. Hand

1. 1. Drum scanner: A drum scanner was the first image scanner developed for use with a computer. It was built in 1957.Drum scanners capture image information with photomultiplier tubes rather than the charge-coupled device (CCD) arrays found in flatbed scanners and inexpensive film scanners. The drum scanner gets its name from the clear acrylic cylinder, the drum, on which the original artwork is mounted for scanning. As its name suggests it consists of the clear acrylic cylinder, the drum, on which the original artwork is mounted for scanning. Drum scanners are capable of scanning both reflective and transmissive artwork.
   2. Flatbed scanner
      • CCD scanner-CCD-( Charge Coupled Devices)

A CCD scanner is composed of a glass pane (or platen), under which there is a bright light (often xenon, LED or cold cathode fluorescent) which illuminates the pane, and a moving optical array in CCD scanning. CCD-type scanners typically contain three rows (arrays) of sensors with red, green, and blue filters.

1. 1. • CIS scanner

CIS-Contact Image sensor. This consists of a moving set of red, blue, green LEDs which are strobed for illumination and it is also connected with a monochromatic photodiode array under rod lens array for collection of light .The Images which user needs to be scanned are placed with a face down on the glass and an opaque cover is low-ered over it which will exclude ambient light, and the sensor array and light source will move across the pane and start reading the entire area. Therefore an image is visible to the detector only because of the light it reflects. Transparent images do not work in this way, and require special accessories that il-luminate them from the upper side. Many scanners offerthis as an option.

1. 2. Film scanner

Uncut film strips of up to six frames, or four mounted slides, are inserted in a carrier, which is then moved by a stepper motor across a lens and CCD sensor inside the scanner. Some models which are mainly used for same-size scans. Film scanners vary a great deal in price and quality. Consumer scanners are relatively inexpensive while the most expensive professional CCD based film scanning system was around 120,000 USD. More expensive solutions are said to produce better results.

1. 1. Hand scanner

This type of scanner are moved over the subject to be imaged with the help of hand. Two different types: 1.document2.3D scanners.

1. 1. Smartphone scanner

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