Worth Data TriCoder t53, Руководство пользователя

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C-3
CCD Scanners
CCD Scanners are not considered a wand scanner but neither are they a
laser scanner. Some CCD scanners are “touch” scanners that require that the
scanner actually touch the bar code. Later CCD scanners could read 1-3”
distance from the bar code.
The Worth Data LI50 Long Range CCD Scanner joins a new category of
CCD scanners that are so radically improved, the scanning industry has
renamed them “Linear Imager Scanners”. This CCD or Linear Imager is so
advanced that it approaches the performance of some laser scanners. It can
read up to a 4.5” width medium density bar code, just like a laser scanner.
The most desirable characteristic of laser scanners is distance scanning. The
CCD has significantly closed the gap in distance scanning that lasers have
traditionally enjoyed. Look at the distance chart below:
Model Bar Code Density Range
LI50 CCD Scanner
6 mil 1” – 4”
10 mil 0.5” – 7”
40 mil 1” – 12”
LI50 Distance Chart
Considering that older style CCD scanners could not even come close to the
above distances, devices like the LI50 are true advancements in scanning
technology. Laser scanners still produce a light beam that is easier to
position correctly on the bar code, because the laser light is more focused to
a sharper, finer, easier-to-see beam. Laser scanners can read longer bar
codes than the CCD scanners although the vast majority of bar codes are
significantly smaller in length than the limit for the CCD reading. Laser
engines are also smaller in size than most of the CCD engines.
The LI50 is point-and-shoot. If you don’t’ get a read right away, move
closer in or farther out until you get a read.
To practice scanning with an LI50 CCD scanner, position the CCD about 3
inches away from the bar code, pull the trigger and make sure that the block
of light emitted by the CCD covers the bar code completely from end to
end. If the bar code is not covered completely, pull the CCD back even
further, up to about 7” away (for a medium density 10 mil bar code). Use
the diagram above for reference.