A barcode reader, or scanner, is an optical-electrical device whose task is to scan the barcode symbol and convert it to an electrical signal. For the computer, it is then no difference whether the information comes via a barcode reader or via a keyboard. The difference is that barcode reader does not enter incorrect information, is much faster and can handle more information.
Different types of barcode reader
CCD reader CCD stands for \ "Charge Coupled Device \", has a light source consisting of LEDs and which illuminates the barcode through a lens system. The CCD reader is moved to the barcode and reads it automatically. It is easy to use and no trigger is required, which gives good ergonomics. However, many barcode readers have triggers that can be configured to be used. Normally, a CCD reader reads from contact and up to approximately 10 cm distances, but newer versions with longer read range capabilities have been introduced in recent years.
Laser Reader The laser reader is based on a LED laser that scans the barcode in a line created by a swinging mirror which then reflects back to the decoder reader. By using different lenses in the laser reader, the desired reading can be varied. A smaller diameter of the laser beam gives higher resolution and low depth of field and can be used for extremely compact codes, such as on circuit boards. With more common optics, reading distance up to one meter can be obtained. Special optics for reading bar codes over 10 meters away are also available. Unlike CCD readers, trigger is required, and the laser reader is also protected by protection. Laser technology is mainly used in applications where \ "longer \" reading distance is required, such as in warehouse, transport or in some retailers.
Barcodes, i.e. a range with thick black lines and white spaces according to a specified system, making it easy and simple to using reading devices input information into computer system. First, reading the numbers and then writing them on a computer takes a lot longer time and gives many opportunities for reading and writing errors.
The barcode is easy to use, it's fast and it's a safe technique.
Barcodes are available in several different types, are strictly standardized for international use and to ensure secure communication. Modern society would not succeed without standards. Through international standardization of a barcode, a long line of its properties and the way to use the different codes are defined.
Examples of common standardized codes are EAN, Interleaved 2/5, Code 39, Code 128, PDF 417, Maxi Code and Data Matrix. They all have different uses, advantages and disadvantages.
Closed or open system
Should the barcode be used internally within its own operations, for example, in the manufacture, in the warehouse or between group companies - then it is called a closed or internal system. Then the user has the freedom to choose any code that meets the required requirements.
Should the system be open, that is to say, other companies such as suppliers, wholesalers and carriers should also be able to use the code. Yes, then the first question is whether there is any industry standard.
Uses & Benefits
The bar code today has many uses and the decision to use barcodes is taken to streamline an operation. If this is not the case, the industry or beneficiary requires that barcode is used.
The food industry and the grocery trade were the first to use the barcode on a large scale. Other manufacturing industries, warehousing and transport sectors have also grown strong. Other highly-expanding bar code industries are hospitals, laboratories and government agencies where you are very careful about cost-effectiveness.
In summary, the barcode benefits are:
Simple and fast
Correct information - no read and write errors