Main parameters of bar code
1, density (Density)
The density of a bar code refers to the number of characters represented by a bar code of unit length. For a code system, the density is mainly determined by the size of the module. The smaller the module size, the higher the density, so the density value is usually expressed as the value of the module size (eg 5 mil). Generally, bar codes below 7.5 mil are called high-density bar codes, and bar codes above 15 mil are called low-density bar codes. The higher the bar code density, the higher the performance (such as resolution) of the bar code reading device is required. High-density bar codes are often used to identify small objects, such as precision electronic components, and low-density bar codes are commonly used in remote reading applications such as warehouse management.
2, Aspect ratio
For a code system with only two width units, the ratio of the wide unit to the narrow unit is called the aspect ratio, which is generally about 2-3 (usually 2:1, 3:1). When the width is narrower, the reading device is easier to distinguish between wide and narrow units, so it is easier to read.
3. Contrast (PCS)
The optical index of the bar code symbol, the larger the PSC value, the better the optical characteristics of the bar code.