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Looking for a barcode reader (or barcode scanner)

The scanner  is an electronic device for reading printed barcodes like a flatbed scanner; it consists of a light source, a lens and a photo conductor translating optical impulses into electrical ones. Nearly all barcode readers contain decoder circuitry analyzing the barcode's image data provided by the photo conductor and sending the barcode's content to the scanner's output port. Scanning methods are distinguished by the amount of operator manipulation required

• Pen Scanner (or Wand Scanner): Pen type readers: requires the operator to swipe the pen over the code.
• Handheld Scanner: with a handle and typically a trigger button for switching on the light source.
• Semi-automatic handheld readers: The operator need not swipe, but must at least position the reader near the label
• Fixed position scanner  Fix-mount readers for automatic reading: The reading is performed laterally passing the label over the reader. No operator is required, but the position of the code target must coincide with the imaging capability of the reader
• Automatic Reader  Reader gates for automatic scanning: The position of the code must be just under the gate for short time, enabling the scanner sweep to capture the code target successfully.
• Stationary Scanner : wall- or table-mounted scanners that the barcode is passed under or beside. These are commonly found at the checkout counters of supermarkets and other retailers.

The reader types can be distinguished as follows:

• Pen type readers consist of a light source and a photodiode that are placed next to each other in the tip of a pen or wand. To read a bar code, the tip of the pen moves across the bars in a steady motion
• Laser scanners work the same way as pen type readers except that they use a laser beam as the light source and typically employ either a reciprocating mirror or a rotating prism to scan the laser beam back and forth across the bar code.
• CCD Readers also referred to as LED scanner use an array of hundreds of tiny light sensors lined up in a row in the head of the reader. Each sensor can be thought of as a single photodiode that measures the intensity of the light immediately in front of it.
• Camera-Based Readers
• 2D Imaging Scanners are the fourth and newest type of bar code reader currently available. They use a small video camera to capture an image of a bar code..

   

   

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