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About Handheld Bar Code Scanners
Handheld bar code scanners are typically used as inventory or point of sale devices. They are manually passed over bar codes to read data, and function in a near or noncontact capacity. A wand is typically made from 1/2" stainless steel tubing or from plastic; the optics are in the front with a cord out the back. The wand scanner must be moved by the user's hand across and in contact with the bar code. While the wand is moving across the bar code, the reflected light is converted to electrical signals through a photocell in the wand. A gun type can be non-contact or near-contact scanner, which generally uses a beam of focused light to read the bar code. The most common form of active non-contact scanner uses a laser beam that is automatically scanned back and forth across the symbol at a high rate. Near-contact scanners utilize a CCD device. Active non-contact or near-contact scanners may be stationary as an option. Gun type readers can also be equipped with optional fixed mounting.
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Engineering Web: Handheld Bar Code Scanners - Machine Design
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Peripherals | Machine Design Camera And Handheld Computer The JETT?eye multimegapixel digital camera |
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Gas-powered electronics | Machine Design electronic devices used for extended periods of time, like this handheld bar-code scanner, make ideal candidates for hybrid-fuel-cell/battery power |
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Basics of Design Engineering: Thinking Cables | Machine Design A designer of handheld bar-code scanners had to communicate with electronic cash registers from IBM, NCR, ICL, and others, each with different |
