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Barcode History |
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Barcode technology
first appeared in the 20th century, 40 years. At that
time the United States two engineers with bar code
information, and in 1949 the world's first bar code
patent. The earliest bar code consists of several black
and white concentric circles, is vividly called bull-eye
bar code.
Wrigley's chewing
gum is the first product which used bar codes, Barcode
technology
was first invented
in the twenties of the twentieth century, in the
Westinghouse laboratory.

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An eccentric
inventors John Kermode, wanted to automate the sorting
of postal documents, at that time, and every conceivable
use of electronic technology was a novelty.
His idea is to put
a barcode label on the envelope, the barcode information
is the address of the recipient, like today's zip code.
For this purpose,
John Kermode invented the earliest bar code
identification, it is very simple (This method is called
the module comparison method), namely a "bar" that the
number "1", two "bars" that the number "2 ", And so on.
He then invented a bar code reading device consisting of
a basic element: a scanner (capable of emitting light
and receiving reflected light), a method of measuring
the reflected signal strip and the null, that is, the
edge locating coil, and using the measured results
Method, i.e., a decoder.

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John Kermode's
scanners used the newly invented photocells to collect
reflected light. "Empty" reflection is a strong signal,
"Article" reflected back is a weak signal. Unlike
today's high-speed electronic components, John Kermode
uses magnetic coils to measure "stripes" and "voids".
Just as a child connects the wire to the battery and
wraps it around a nail. A coil with an iron core draws a
switch when it receives an "empty" signal, and when it
receives a "bar" signal, it releases the switch and
turns on the circuit. As a result, the earliest bar code
readers are noisy. The switch is controlled by a series
of relays, "on" and "off" depending on the number of
"bars" printed on the envelope. In this way, barcodes
are used to sort the letters directly. Shortly
thereafter, Douglas Young, a collaborator at John
Kermode, made some improvements based on the Kermode
code.

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Kermode's barcode
contains very less information, and it is difficult to
encode more than ten different codes. The Douglas
Young's barcode uses fewer bars, but utilizes an empty
size change between strips, as today's UPC bar code
symbols use four different bar sizes. The new bar code
symbol can be in the same size space for a hundred
different regions to be encoded, while the Kermode's
barcode can only be encoded in 10 different regions.
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Until 1949 in the
patent literature that for the first time there was an
omnibearing bar code symbology invented by Norm Woodland
and Bernard Silver, in the prior patent literature There
is no record of bar code technology, there is no
precedent for practical application. The idea of Norm
Woodland and Bernard Silver is to use the vertical
"strips" and "hollows" of Kermode and Douglas Young and
bend them into rings, much like archery targets. So that
the scanner can decode the bar code symbol by scanning
the center of the figure regardless of the orientation
of the bar code symbol direction.

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In a process of
continuous improvement using the patented technology, a
science fiction writer, Isaac Azimov, in his book
Naked Sun, Using the new method of information coding to
achieve automatic identification of the case. At the
time, people felt that the bar code symbol in the book
looked like a checkered checkerboard, but today's bar
code professionals will immediately realize that this is
a two-dimensional matrix bar code symbol. Although this
bar code symbol has no orientation, positioning and
timing, it is clear that it represents digital coding of
high information density.
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Until 1970
Iterface Mechanisms developed the "two-dimensional
code", the price for sale only two-dimensional matrix
bar code printing and reading equipment. When
two-dimensional matrix bar code for the newspaper
publishing process automation. Two-dimensional matrix
bar code printed on the tape, scanned by today's
one-dimensional CCD scanner read. CCD light emitted on
the tape, each photocell aligned paper tape in different
areas. Each photocell according to the bar code on the
tape to print a different pattern, combined to produce a
high density information pattern. In this way, a single
character can be printed in the same size space as a
single bar in the early Komond code. Timing information
is also included, so the whole process is reasonable.
When the first system to enter the market, including
printing and reading equipment, including a full set of
equipment to about 5000 dollars.
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Shortly, with the
continuous development of LEDs (light emitting diodes),
microprocessors and laser diodes, a new explosion of
symbol (symbolic) and its applications was called "bar
code industry". Few companies or individuals find bar
code technology that does not come into direct contact
with the fast and accurate bar code technology today. As
technological advances and developments in this area are
very rapid, and more and more applications are being
developed every day, bar codes will be as popular as
bulbs and semiconductors for a long time, and will make
every one of us live Have become more relaxed and
convenient.
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With the rapid
expansion of retail and consumer markets and
development, but also to promote the growth of China's
bar code label business. Because more and more places
need to use labels and bar codes. In fact, as early as
the 1970s, bar code has been in the global retail
industry has been a small range of applications, and
now, bar code and automatic identification systems and
data acquisition technology is still in the global play
a vital role.

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In fact, on a
global scale, the number of bar code scans required
every day has exceeded 100 million times, and its scope
of application also covers various fields and
industries, including logistics, warehousing, library,
bank, pos cash register system, , Retail goods,
clothing, food services and high-tech electronic
products, and so on, and is still in every day in a
number of new projects continue to use bar code
applications. With the continuous development of the
market, we have enough confidence that the bar code will
certainly promote us to experience a better quality of
life and can save our valuable time.
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For example, in
the logistics industry, the classification of goods in
logistics, the allocation of location, location
inquiries, access to library information, inventory
access, product inquiries, etc., if it is done with
human effort, not only a waste of time, Financial
resources, but also often accompanied by a very large
error rate, for most businesses and the logistics
industry's own development has brought a lot of
problems, it can be said that there is no bar code
logistics process will be how messy, its The
consequences are often unimaginable. The bar code
technology on the advantages of the logistics industry
is also obvious, both accurate management, functional
and practical. For most of the modern warehouse
management needs can be met. Easy to operate and
maintain, do not bother, the warehouse administrator
after a simple training can quickly induction for
operation. But also greatly reduce the high rate of
human error. The type of cumbersome work instantly
annoying as easy to query the time of the goods is
particularly convenient, no longer need to spend a lot
of manpower to search a wide range of out of the
purchase documents, just a sweep on the computer gently,
the required cargo model , Dealers, into the shipping
date, managers and other specific details can be
displayed, and can print out. And this part of the data
can also be backed up, not because of death or computer
virus and worry about the loss of data. After all, human
management system.
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At present, the
international widely used types of bar code products
have EA NUPC bar code, used in the world only to
identify a commodity. Supermarkets, the most common is
that the bar code Code39 code can represent numbers and
letters, the most widely used management field ITF25
code logistics management more Codebar code for medical,
the field of Code93 Code, Code128 code.
Among them, EA N
code is widely used in the world of commodity bar code,
EDI has become the basis of electronic data; UPC code is
mainly used in the United States and Canada; various
types of bar code applications, Code39 code can be used
because of its common numbers and letters Codebar code
is also widely used in the business of blood banks,
libraries and photo galleries, and is widely used in
internal management of various industries.
In addition to the
above-mentioned one-dimensional bar code, the
two-dimensional bar code has also been in the rapid
development and find applications in many fields.
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