Maker Code / Margin / Module / Modulus / MRD / Multi-level

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Maker Code

A 5-digit code appearing after the flag in theJAN symbology. It is the code given to the maker of products, import dealers or venders. The maker code is administrated by the DCC.

Margin

Spaces where nothing is printed, are required at each end of a barcode and should be 10 times that of a narrow bar. In this case, it is the same as a Quiet zone.

(See Quiet Zone)

Module

The minimum units of black/white bars in a multi-level bar code. Modules compose an element, and elements compose a character.

Modulus

A coefficient or numerical measure often used in the calculation of checkdigit.

(See the page of Checkdigit)

MRD

<Minimum Reflection Difference>

The difference of reflection ratios of white/black bars.

Where the minimum element width is < 1.016mm

Reflection Ratio of white bars (RL) 37.5 or more
Reflection Ratio of black bars (RD) 30.0 or less
MRD (RL - RD) might be 7.5 or more

Where the minimum element width is > 1.016mm

Reflection Ratio of white bars (RL) 30.0 or more
Reflection Ratio of black bars (RD) 25.0 or less
MRD(RL - RD) might be 5.0 or more

** Reflection Ratio is on the condition of red light in 660nm(nanometer = 1/100000000 m) wavelength.

(See PCS)

Multi-level

One of two bar code types, having varying width of black and white bars:
EAN, CODE-93, CODE-128, etc.

(See binary level)

Maker Code / Margin / Module / Modulus / MRD / Multi-level

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