How digital card printer works

If you are among the truly curious, you may wonder how FARGO digital ID card printers actually get those great looking images onto plastic cards. Well, this too is easier than you might expect.  FARGO ID Card Printers utilize two similar technologies called direct-to-card printing and High Definition Printing (HDP).

High Definition Printing technology

  • Direct-to-card printing is the traditional technology used by digital card printers to print images directly onto the surface of a plastic card. it does this by heating a special print ribbon beneath a thermal printhead, resulting in the transfer of color from the ribbon to a blank card.
  • With the FARGO High Definition Printing technology, the printer first prints images onto a special HDP film which is then fused into the surface of
    a blank card through heat and pressure.  Because the graphics and text are
    printed on the underside of the HDP
    film, the image is “sandwiched”between the highly durable film and the card.  This unique process results in exceptional print quality, durability,
    and the ability to print on the widest variety of acrd types or sizes.

During printing, a printhead containing hundreds of thermal elements heats the dyes on the ribbon which then vaporize and diffuse into the surface of either the card (for direct-to-card printing) or the HDP film.  A separate pass is made of reach of the three color panels on the ribbon. By combining the colors of each panel and by varying the heat used to transfer these colors, the printer is able to produce up to 16.7 million, photo-realistic colors.

With either of these remarkable digital printing technologies, there are two shared print methods both use to actually do the printing. These print methods are called dye-sublimation and resin thermal transfer.

Resin Thermal Transfer

Resin Thermal Transfer is the process FARGO printers use to print sharp black text and crisp bar codes which can be read by both infra-red and visible-light bar code scanners.  like dye-sublimation, this process uses the same thermal printhead to transfer color from the ribbon roll to the card or the HDP film. The difference, however, is that solid dots of color are transferred in the form of a resin-based ink which is fused to the surface of the card when heated. This produces very durable, single-color images.

Resin black panels are included on many of the FARGO full-color dye-sublimation ribbons so that you can automatically print both dye-sublimation and resin images on the same card.  This gives cards the benefits of both print methods.

Resin-only ribbons are also available for use with the FARGO direct-to-card printers for printing economical one-color cards in as fast as 5 seconds.  These ribbons consist of a continuous roll of a single resin color and can produce up to 3,000 cards. Black, scratch-off and a variety of other resin ribbon colors are available.

Dye-Sublimation

Dye-Sublimation is the process FARGO printers use to print smooth, continuous-tone images that look truly photographic. This process uses a dye-based ribbon roll that is partitioned by a number of consecutive color panels. The panels are grouped in a  repeating series of the three process color — Yellow Magenta, and Cyan (YMC) — along the entire length of the ribbon.

Bar Code Standards

In the barcode arena, AIM has long been the traditional source of the technology standards. The most used of the AIM standards have now been adopted by ISO and can be obtained from the ISO organization.

The ISO bar code standards are:

ISO/IEC 15417 Bar code symbology specification – Code 128
ISO/IEC 15420 Bar code symbology specification – EAN/UPC
ISO/IEC 15424 Data carrier identifiers (including symbology identifiers)
ISO/IEC 15424 Bar code symbology specification – PDF417
ISO/IEC 16022 Bar code symbology specification – Data Matrix
ISO/IEC 16023 Bar code symbology specification – Maxicode
ISO/IEC 16388 Bar code symbology specifications – Code 39
ISO/IEC 16390 Bar code symbology specifications – Interleaved 2-of-5
ISO/IEC 18004 Bar code symbology QR Code
ISO/IEC 24723 EAN.UCC Composite bar code symbology specification
ISO/IEC 24724 Reduced Space Symbology (RSS) bar code symbology specification
ISO/IEC 24728 MicroPDF417 bar code symbology specification
ISO/IEC 24778 Aztec Code bar code symbology specification

Current status

For those bar code symbologies that are not published as ISO standards, you can visit AIM (http://www.aimglobal.org) to find the specification.

Linear Matrix Stacked/Packet Composite
Code 128 Aztec Code Code 16K EAN.UCC Composite
Code 39 QR Code Code 49 Aztec Mesas
Code 93 Code One Codablock F   
Code 93i  Data Matrix  SuperCode   
Codabar  Dot Code  A Micro PDF 417   
Channel Code MaxiCode PDF 417   
Interleaved 2 of 5       
Posicode      
Reduced Space Symbology        
Telepen      

Symbology standards are also available from other organizations. For example, the U.P.C. and EAN symbologies are available from UCC and EAN. Most proprietary symbologies are only available from their respective inventors.

What is a Symbology Standard?

A symbology specifications give all the details necessary to print or scan a barcode. The documents range from 8 pages to 120 pages, so you can see that there is a lot of information needed to create a barcode.

Looking at a standard from a very simplistic level, it must contain:

  • A definition of the width of the bars and the spaces.
  • A method to define each character that is encodable (whether numeric only or full ASCII).
  • The start and stop characters
  • Any check character support built in
  • Any free space needed around the symbology to allow for a clean decode

From these basic definitions, it then gets to be complicated as error correction becomes a factor and as we start to talk about non-linear symbologies. With some of the two dimensional symbologies allowing the encodation of several kilobytes of data, on a symbol that may be several square inches in size, it become important to fully define the “rules” for a symbology.

 

Posted with Steve Halliday permission, president  of High Tech Aid.

Magnetic Stripe – Secure or Perilous

There are currently available several technologies which can be used to secure data on a magnetic stripe. Although these technologies work in different ways, they all set out to achieve the same thing – ensure that the data encoded on the stripe is only valid with one card. So if the card is duplicated in some way, the security feature is able to detect the fact that the data is now encoded on the wrong card.

Watermark Magnetics™ from Thorn EMI Secure Science International uses a special magnetic stripe with a number permanently encoded into the oxide. The number is created during the manufacturing process of the stripe and is permanently locked into the stripe. The process uses a special reader to read and verify the presence of the number. The number is encoded across the width of the stripe but it allows for conventional data to be encoded over the top of the Watermark number. During the encode process the data is linked to the Watermark number in some way. Then during the read process, both the Watermark number and the conventional data are read and the link is verified.

ValuGard® from Rand McNally also uses the physical properties of the stripe to ensure that no duplication or counterfeiting takes place. Unlike Watermark Magnetics which uses a physical change encoded into the stripe, ValuGard uses the inherent properties of the stripe. A read head analyzes the physical properties of the stripe (alignment, noise et.) and a value is encoded on the stripe to represent the properties. This “security” value is calculated every time the stripe is read and is compared to the value encoded on the stripe, to ensure that it is the same document.

Holomagnetics from American BankNote Holographics uses a series of machine-readable holographic images over the magnetic stripe. The pattern of images on each stripe is unique, based on the registration of the images from the edge. The pattern is read and converted to a numerical code and stored on the magnetic stripe. As with the other security systems, the numerical code is re-calculated each time the card is read and compared to the value encoded on the stripe.

XSec® from Xtec, Inc. uses the physical properties of the magnetic stripe to derive its security. The technology concentrates on the inherent jitter of the magnetic data on the card. The encoding is analyzed and a value is then encoded on to the magnetic stripe. This value is checked each time the card is read to ensure the card is not a counterfeit.

XiShield™ from Xico, Inc uses a permanent infrared optics pattern concealed within the card during its manufacture to provide the security. As each individual card has a unique optical pattern associated with it, the magnetic stripe data and the optical pattern can be linked to provide the security needed.

Posted with Steve Halliday permission, president of High Tech Aid.