| 摘要 |
A composite authentication mark (10) includes a bar code portion (20, 25) that is visible when illuminated with visible light and invisible code portion that is not visible when illuminated with visible light, wherein the bar code portion includes a plurality of bars (20) and spaces (25) and the invisible code portion (30, 40) is arranged in at least one of the spaces of the bar code portion without overlapping any of the bars of the bar code portion. Because the invisible code portion does not overlap with any of the bars of the bar code portion, single-step printing and reading processes may be used. As an additional benefit, because the invisible code portion is arranged in one or more spaces of the bar code portion, the visible ink used to print the bars of the visible bar code portion does not interfere with the reading of the invisible bar code portion by absorbing the light that is used to illuminate and excite the invisible code portion. More information can be coded by the composite authentication mark by using the relative location of the invisible code portion within the spaces of the bar code portion.
|
