barcode scanner

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barcode scanner

A device specialized for reading barcodes and converting them into digital data. Pen scanners, also known as wand scanners, were the first type of scanner developed in the 1970s. The tip of the pen must physically touch the barcode. Later, laser scanners allowed the code to be read at a distance from the head of the device, enabling supermarkets to read round cans and flexible packages more easily. The most common type today is the visible laser diode (VLD) scanner, which emits as many as 50 laser beams simultaneously to capture the image at any angle. See barcode, mobile tagging and point of sale.

Laser Diode Mechanism
A laser diode (1) emits a beam (red) onto a combination of rotating (2) and fixed mirrors (3) that shine multiple beams onto the barcode (4). Although as many as 50 beams may hit the package at different angles, only one is shown in this illustration. The reflected light (yellow) is captured by the collector (5) and aimed at a sensor (6).

The Reflection
The black bars absorb light, while the white bars reflect it. Photo diodes turn the reflected light into an electrical signal, which is converted into digital pulses.

Scanning a Package in Staples
Modern omnidirectional scanners make it easy to capture the code at all angles with less precision required on the part of the human operator.

The CueCat - A Most Unusual Barcode Scanner
As the Web was exploding at the turn of the century, this scanner was created to give businesses a Web presence. Connected to the PC, users could scan a printed Cat code and quickly get a Web page. Another part of the system was software for the PC that had to be connected to the audio output of a TV. It would listen for special Cue signals and deliver the Web page. With four million CueCats given away and $185 million invested, the Dallas, Texas-based firm fizzled to nothing in a short time.
References in periodicals archive ?
MicroHAWK bar code readers are built around the smallest bar code imaging engine in its class, with configuration options for speed, sensor, density, decoder and lighting.
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The bar code reader is used to identify batch number and select test temperature and time.
Before the casting was brought inside the finishing cell, a bar code reader already had scanned the code on the fixture for the cast component that directs the robot to the proper finishing program to upload.
Providing the mobile user with additional flexibility, a CompactFlash II expansion slot offers a suite of productivity add-on devices such as Global Positioning System, bar code reader for inventory management, Wi-Fi (802.