Datasheet

PAGE 12
PARTNER BRIEF
LI4278
UNDERSTANDING THE SPECIFICATIONS BEHIND A LINEAR IMAGER
Published specification figures, such as scans per second, aren’t always indicative of actual performance in real
world applications. Over the years we have been working hard to perfect the design of a handheld linear imager that
can deliver the best possible performance under the widest range of real world operating conditions. Refer to the
following to help your customers understand and evaluate the typical specifications across linear imagers — and
better realize what each specification means to their daily operations.
Scans Per Second
Published scans per second figures are achieved at very close ranges. As the bar code is moved farther away from
the imager, the exposure time needs to be increased — driving down the scan rate. The LI4278 offers a superior
illumination system, which is more efficient at delivering light to the bar code and to each pixel of the sensor. As a
result, the LI4278 maintains a higher scan rate throughout its range compared with other linear imager solutions on
the market.
Working Range
On some bar code densities, the LI4278’s working range is twice as much as other solutions. From retail to
warehousing applications, this extended range is essential to keeping productivity high as workers can scan items
with less maneuvering. In addition, the same scanner can now be used for multiple tasks, rather than having a
different method or requirement necessary to perform various tasks.
Motion Tolerance
The same superior optical system that allows the LI4278 to retain a high scan per second rate at extended range also
translates into a shorter exposure time compared with other linear imagers. This results in better motion tolerance —
a traditionally weak area for linear imagers. We consider motion tolerance to be such a critical specification to real-
world applications that we resisted developing a linear imager until the technology enabled us to build a linear imager
with similar motion tolerance specs to a laser scanner.
Angular Tolerance
The LI4278’s system delivers so much more light to our sensor that we are able to use a shorter imaging aperture
compared with competitive products. The result? The LI4278 offers superior angular tolerance that allows workers to
scan through a pile of randomly positioned items faster; less time is needed to reposition packages and reorient bar
codes before scanning. Just like with motion tolerance, angular tolerance has traditionally been a weak spot for linear
imagers compared with laser scanners. We’ve worked hard to bring a versatile and effective linear imager to market
so our customers will benefit from our enhanced design.
Performance on High Density Bar Codes
The LI4278 is the only handheld linear imager on the market today that provides superior performance for both high
density and low density bar codes in a single unit. Other manufacturers develop specialized high density versions, which
offer strong performance on high density bar codes but have less range for low density bar codes. If a customer has a
mix of high and low density bar codes, they traditionally have had to sacrifice performance on one or the other. But not
so with the LI4278. Our linear imager not only has better performance on high densities compared with specialized high
density scanner configurations, but has equally stunning performance on lower density bar codes as well.