1-3
Getting Started
A 31-pin ZIF connector on the SE4400 connects the engine and the device via a 40 mm
flex (available from Symbol, p/n 50-16000-650, via KT-SE4400-01). For information about
this connector and flex, see
The Visible Laser Diode (VLD) and a diffractive optical element (DOE) in the SE4400
generate an aiming pattern. The illumination LED allows image capture in any lighting
condition.
The primary component of the imager system is a 1/5" format CCD monochrome VGA
resolution sensor which consists of a 640 x 480 effective pixel array. The CCD sensor is a
progressive scan type and converts the electrons depicting each pixel to a voltage, similar
to a digital camera. An electronic shutter controls the exposure time of the sensor.
The CCD is accompanied by a signal processing companion multi-chip module (MCM),
which contains the charge pumps and timing generator needed to drive the CCD. The MCM
also contains a correlated double sampler (CDS) and A/D converter to convert the analog
voltage output by the CCD into an 8-bit digital value representing one of 256 shades of gray.
Aiming System
A 650 nm laser and a DOE generate a laser-aiming pattern which represents the imager's
field of view throughout its entire depth of field. The aiming subsystem uses a visible laser
diode, a lens, and a diffractive optical element to generate the aiming pattern. The pattern's
center cross hairs indicates the center of the field of view.
Figure 1-2. Aiming Pattern
Aiming Error
The aiming pattern is designed to eliminate divergence (parallax) between the aiming axis
and the imaging axis. This method provides an aiming axis parallel to the imaging axis,
while minimizing the offset between the two. See
for Aiming Element
specifications.
Summary of Contents for Symbol SE4400
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