A bar code reader (or bar code scanner) is an electronic device for reading printed barcodes. Like a flatbed scanner, it consists of a light source, a lens and a light sensor translating optical impulses into electrical ones. Additionally, nearly all barcode readers contain decoder circuitry analyzing the bar code's image data provided by the sensor and sending the barcode's content to the scanner's output port.
Bar code readers can be differentiated by technology as follows:
- Pen-type readers
- Laser scanners
- CCD readers
- Camera-based readers
- Omni-directional bar code scanner
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