C Bar Code Label Specifications - Socket 9M User Manual

A C
PPENDIX
B C L S
AR ODE ABEL PECIFICATIONS
All bar code symbols/labels should satisfy the appropriate AIM
Uniform Symbology Specification.
Background Substrate:
The bar code symbol should be printed on material (media) that is
reflective and has a matte (not glossy) finish. A background diffuse
reflectance of at least 70% to 80% is desirable for optimum contrast.
Retro-reflective media should be used to obtain decode distances
greater than 36 inches.
Ink Color and Type:
The inked bars should not exceed 25% reflectance at the
wavelength that is being used for reading, whether printed with black
ink or colored ink. The reflectance value should not vary more than
5% within the same character.
Voids and Specks:
The code should be printed clearly, free of voids, specks, blemishes
and lines that could "fool" the scanner. Specks or blemishes in the
white spaces, or false or missing bar sections could be interpreted
by the reading equipment as part of the code. Generally, the width
of such flaws is more serious than the height. Code symbols/ labels
should be rejected if these defects are present.
Definition:
The bars in the bar code symbol should be well defined. Their
edges should not be rough or fuzzy, so that the bars and spaces
have the proper widths intended for the bar code symbology used.
Contrast:
Background reflectance (that of the substrate on which the codes are
printed) should always provide a good contrast relative to the ink
reflectance (that of the code bars). The difference between the two
should be at least 37.5% at the wavelength used for reading.
72 | APPENDIX C: BAR CODE LABEL SPECIFICATIONS