What is Bar Code Reader or scanner…?

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    A Bar Code Reader is a device for scanning or reading a bar code .  We may see its uses in a wide range . This Bar code is printed code which is made of parallel bars of different width and spacing. 
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History:

A standardized identification or scanner tag is a strategy for speaking to information in a visual, machine-lucid structure. At first, scanner tags spoke to information by changing the widths and spacings of equal lines. These standardized identifications, presently usually alluded to as direct or one-dimensional (1D), can be filtered by unique optical scanners, called standardized tag perusers.

Afterward, two-dimensional (2D) variations were created, utilizing square shapes, dabs, hexagons and other mathematical examples, called network codes or 2D standardized identifications, in spite of the fact that they don’t utilize bars thusly. 2D scanner tags can be perused or deconstructed utilizing application programming on cell phones with inbuilt cameras, for example, cell phones.The standardized identification was imagined by Norman Joseph Woodland and Bernard Silver and licensed in the US in 1951.

The development depended on Morse code that was stretched out to thin and thick bars. Nonetheless, it took more than twenty years before this development turned out to be economically effective. An early utilization of one sort of scanner tag in a modern setting was supported by the Association of American Railroads in the last part of the 1960s. Created by General Telephone and Electronics (GTE) and called KarTrak ACI (Automatic Car Identification),  

this plan included setting shaded stripes in different mixes on steel plates which were joined to the sides of railroad moving stock. Two plates were utilized per vehicle, one on each side, with the plan of the shaded stripes encoding data, for example, possession, kind of gear, and ID number.

The plates were perused by a trackside scanner, situated for example, at the passageway to an arrangement yard, while the vehicle was moving past. The undertaking was deserted after around ten years on the grounds that the framework demonstrated temperamental after long haul use.

Scanner tags turned out to be industrially fruitful when they were utilized to computerize grocery store checkout frameworks, an errand for which they have gotten practically all inclusive. The Uniform Grocery Product Code Council had picked, in 1973, the standardized tag configuration created by George Laurer.

Laurer’s scanner tag, with vertical bars, printed in a way that is better than the round standardized identification created by Woodland and Silver. Their utilization has spread to numerous different errands that are conventionally alluded to as programmed ID and information catch (AIDC).

The principal examining of the now-pervasive Universal Product Code (UPC) standardized tag was on a pack of Wrigley Company biting gum in June 1974 at a Marsh grocery store in Troy, Ohio, utilizing scanner created by Photographic Sciences Corporation. QR codes, a particular kind of 2D standardized tag, have as of late become mainstream because of the development in cell phone possession.

The application most commonly observed is the coding on food and other goods that is read at the cheack out counter and translated into a line of print on the bill showing product and cost. The information is also used to update in stock records and sales statistics . It is very easy to use . And it have a very good use popularity in this developing world.  

  In the United States the code used for this purpose is the UPC which is known to us as Universal product code. In this world there is so many people lives and to lead a happy  life so many people choose to be a business man . They make them comfortable with business .      In business ,

Businessman always face some common problem with their product . How much they sell their product and when they make their new updates that’s make them worried . This whole problem can be solved by using Bar Code Reader.


Structure of a Bar Code Reader:

     According to UPC it decodes into two five digit numbers . The first five identify the supplier and the next five are the item number that supplier’s range of good .    And there is another code named European Article Numbering (EAN) . According to this code , it has two digit number to indicate country of orijin. Other codes are also used for shopping collection, library systems and monitoring the circulation of confidential document .       There are two generals parts in a Bar Code 

·   Product number



·   Manufacturers identifications number.


      It use in a computer as a scanning device. It works like a Input devices in a computer . if you don’t know much about Computer’s Input and output unit then I recommended you to check out my this article which will make you clear  about I/O unit of computer. 
 Brief on Input and output unit of a computerBrief on Input and output unit of a computer

Uses of Bar code

A standardized identification or scanner tag is a strategy for speaking to information in a visual, machine-lucid structure. At first, scanner tags spoke to information by changing the widths and spacings of equal lines. These standardized identifications, presently usually alluded to as direct or one-dimensional (1D), can be filtered by unique optical scanners, called standardized tag perusers.

Afterward, two-dimensional (2D) variations were created, utilizing square shapes, dabs, hexagons and other mathematical examples, called network codes or 2D standardized identifications, in spite of the fact that they don’t utilize bars thusly. 2D scanner tags can be perused or deconstructed utilizing application programming on cell phones with inbuilt cameras, for example, cell phones.

The standardized identification was imagined by Norman Joseph Woodland and Bernard Silver and licensed in the US in 1951. The development depended on Morse code that was stretched out to thin and thick bars. Nonetheless, it took more than twenty years before this development turned out to be economically effective. An early utilization of one sort of scanner tag in a modern setting was supported by the Association of American Railroads in the last part of the 1960s.

Created by General Telephone and Electronics (GTE) and called KarTrak ACI (Automatic Car Identification), this plan included setting shaded stripes in different mixes on steel plates which were joined to the sides of railroad moving stock. Two plates were utilized per vehicle, one on each side, with the plan of the shaded stripes encoding data, for example, possession, kind of gear, and ID number.

The plates were perused by a trackside scanner, situated for example, at the passageway to an arrangement yard, while the vehicle was moving past. The undertaking was deserted after around ten years on the grounds that the framework demonstrated temperamental after long haul use.

Scanner tags turned out to be industrially fruitful when they were utilized to computerize grocery store checkout frameworks, an errand for which they have gotten practically all inclusive. The Uniform Grocery Product Code Council had picked, in 1973, the standardized tag configuration created by George Laurer.

Laurer’s scanner tag, with vertical bars, printed in a way that is better than the round standardized identification created by Woodland and Silver. Their utilization has spread to numerous different errands that are conventionally alluded to as programmed ID and information catch (AIDC). The principal examining of the now-pervasive Universal Product Code (UPC) standardized tag was on a pack of Wrigley Company biting gum in June 1974 at a Marsh grocery store in Troy, Ohio, utilizing scanner created by Photographic Sciences Corporation. QR codes, a particular kind of 2D standardized tag, have as of late become mainstream because of the development in cell phone possession.

There are many Online bar code scanner   in google.

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