Scanner "Tech Tips"

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Understanding Scanner Technologies
CCD vs CIS

When purchasing a scanner, there are basically two choices with regards to technology – CIS (Contact Image Sensor) or CCD (Charged Couple Device). A scanner consists of a light source, one or more image sensors and a lens system. This
is true for both CIS and CCD scanning technologies. Contact image sensors (CIS) are in near contact with the image while scanning the document. The CCD (charged
couple device) requires a much longer focus distance, usually obtained through folded optics directing the light path through a series of mirrors.

CCD method
(optical reduction method)

Light from the light source is reflected by the document's surface. This light is
reflected further by a mirror, directed through a lens, and received by the CCD. Since the CCD reads light reduced by the lens, this method is called the “optical reduction method”.



CIS method
(contact image sensor method)

The light from the three RGB color LEDs used as light source are reflected by the document. This reflected light is received in turn by the CIS sensor, which performs the actual scanning. The LEDs, lens, and sensor are integrated into a single module. Since these components are all rods of the same length in close contact, this
method is called the “contact image sensor” method



Which to choose? It depends on what you are scanning, and how much scanning you are doing. Generally, a CIS scanner is considered to be better for technical documents (CAD, AEC, GIS, Maps, Government, and Utilities) because it is able to reproduce
fine lines, small type and minute details. It is also most likely the preferred solution for high-volume scanning as it provides higher
throughput, and requires no warm-up time.

A CCD scanner is often used in the graphic arts arena to scan photographs, renderings, posters, and other items with the need for high/true color reproduction. CCD scanners generally are available in larger sizes, including flatbed scanners that are often used to scan fine art.

For more information about scanning technology and to find the
best fit for your situation, contact Paradigm Imaging Group at
info@paradigmimaging.com.

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