Manual No. 25-NLB0045-01
Series NLB-9625/9645 Mini Laser Fixed Position Scanner
Page 9
2) Avoiding Specular Reflection
Do not position the scanner at an angle that causes the laser scan line to be reflected directly back into the
scanner. This is called specular reflection. Too much reflected light can blind the scanner preventing a good
decode.
If the bar code label is located on a flat surface, specular reflectivity occurs b3 degrees off perpen-
dicular (See diagram in Section 2). If the bar code label is located on a cylindrical surface, such as a test tube,
the angle of specular reflection is measured tangent to the curve. If the curved surface is also moving, there
may be more than one position causing specular reflection.
Specular Reflection Area
: Avoid +3
°
around X axis (see diagram above).
Preferred angle is +10
°
Skew
Skew Angle
+60
°
around Y axis
Rotation
+60
°
around Z axis
Tilt Angle
+55
°
, -50
°
around X axis
NLB-964x
NLB-964x
Scan Line
Ba
r C
ode
Avoid +3° Region
Z Axis
