State Of The Art In Bar Code Scanners

Bar code scanners are used to read the bar codes found on products in a wide variety of situations. Most of us are familiar with bar codes found on packages at the grocery store. When you purchase an item, the bar code on the package is scanned by a bar code scanner. This automatically calls up the item particulars such as the item name and unit cost. The cost is then calculated automatically and added to your bill.

When you buy a product such as a can of soup or a box of cereal, it alerts the stock control system to the fact that the item was purchased. This allows the control system to maintain a current record of how many of each item is still available for purchase. As long as the entire inventory was entered correctly in the first place, this allows your inventory control to be automatic and constantly up to date.

In a small business setting implementing such a system starts with stock control software where information about inventory items is stored. Bar code scanners are used to input data into the stock control system. Each time an item passes in or out of inventory it is scanned and the appropriate change of status is recorded in the inventory database.

It is important that each item has its own unique bar code. Items that don't already have a bar code can have a unique one generated for them by the stock control software. You then use a bar code printer to print out the code which can then be attached to the item.

Here are the three most popular types of bar code scanners currently in use:

1. The Wand Scanner - This is the simplest type of bar code scanner. A wand scanner is shaped like a pen and has to be touching the bar code to scan it. The light from the wand scanner is reflected off the bar code and then the system decodes this signal to recognize the product.

The wand system works very well most of the time, and is is the cheapest kind of bar code scanner. As far as cost is concerned, one of these wands will cost 1/10th as much as a laser gun, and about 1/5th as much as a CCD scanner.

However, wand scanners are limited in their appplication. To succeed in obtaining a proper reading, the wand has to be positioned correctly with respect to the bar coding label. It is necessary as well to slide the wand along the label neither overly rapidly nor overly slowly. Wand scanners are limited by their resolution requirements too. If a bar code's resolution is too fine, then the wand won't be successful in scanning it properly. For instance, a 5 mil bar code cannot be read by a 10 mil device. You must remember that when you go out to buy a wand scanner.

2. The CCD Scanner - CCD (charged coupled device) technology is the next least expensive bar code scanning system. Like the wand scanner, CCD readers must be in direct contact with the bar code label in order to read it. But unlike the wand, there is no need to move the device across the label. The operator simply presses the reader against the label and pulls the trigger. The bar code is then photographed, digitized and decoded by the system.

Of all the various types of bar code scanners, CCD readers tend to be the simplest to use. CCD readers can be found in widths from 2 to 4 inches and, while they are more expensive than a wand, CCD readers are less expensive than laser scanners.

A promising new technology similar to CCD is called FFO (Fixed Focus Optics). These scanners are non-contact readers, which means they can read bar codes from as much as 20" away. They will also be able to read two-dimensional bar codes as they become more popular.

3. The Laser Scanner - More sophisticated high volume applications use laser scanners to read and record bar codes. The bar code label is scanned quickly by a laser scanner using a beam of light. This means that there is no need for the bar code label to touch the scanner, and the scanner isn't portable. Since scanning occurs when the object is simply held in front of the scanner, item scanning is essentially automatic.

Such a system has benefits in a variety of situations. For instance, because the scans are accomplished with great speed, it is possible to embed laser scanners inside of conveyor systems. When items pass by rapidly, scanning takes place automatically. In a retail environment, the clerk merely moves each item over the glass to engage the scan. Such a system can easily keep pace with a clerk who simply moves objects from one side of the scanner to the other other. Laser systems are much more rapid and accurate than any other widely-used alternative.

No matter what your ideal scanning system might be today, you need to make certain that you buy a stock control system that allows you to take advantage of future developments in bar code technology. This will allow you to keep your system updated without having to replace the entire system in the future.

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