TECHNICAL INFORMATION, ID Bar Code
C-18 Sysmex SF-3000 Operator's Manual -- Revised September 1995
3.2 Dimensions of Elements
Bar codes consists of five elements: a narrow bar, a narrow space, a wide bar, a wide
space, and a gap between characters. Each element has to comply with all of these
equations:
(a) Narrow element ≥ 150 µm
(b) Wide element ≤ 1.2 mm
(c) Narrow element ≤ Gap between characters ≤ Wide element
NOTE: ITF does not require above mentioned item (c), since ITF does not use
a gap between characters.
3.3 Requirements on Wide/Narrow Ratio
For each character, the ratio of the wide element and the narrow element has to comply
with all the equations listed below:
(1) (2) (3)
Narrow (Max)
Narrow (Min)
≤ 1.3
Wide (Min)
Narrow (Max)
≥ 2.2
Wide (Max)
Wide (Min)
≤ 1.4
Here, the narrow (Max) means the widest element of narrow elements in a character.
The narrow (Min) means the narrowest element of narrow elements in a character. The
wide (Min) means the narrowest element of the wide elements in a character and the wide
(Max) means the widest element of wide elements in a character.
3.4 Optical Requirements
(1) Requirement on the Print Contrast Signal (PCS) is:
PCS =
Rs-Rb
Rs
≥ 0.6
Rs: the reflectivity of the space (background)
Rb: the reflectivity of the black inked bar
The measuring method conforms to the JIS (Japanese Industrial Standards) B9550, "5.3
Optical Characteristics of Bar Code Symbols".
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