Concentric-ring circular bar code
A circular bar code includes at least one circular data ring having a plurality of data cells arranged side-by-side in a circle, a circular locator ring of a solid color and conveying the location and size of the bar code to a reading device; and a locator cell conveying the orientation of the bar code to the reading device. The locator ring and the at least one data ring have a finite width, and are concentric, without any gap between adjacent rings. The locator ring can be either inside or outside of the at least one data ring. The locator cell is defined by a gap in the locator ring and a single data cell located in a data ring adjacent the locator ring. The circumferential and radial dimensions of the locator cell convey the data cell size to the reading device.
1. A circular bar code comprising:
at least one data ring, each data ring comprising a plurality of data cells arranged side-by-side in a circle;
a locator ring, the locator ring being a solid color and conveying the location and size of the bar code to a reading device; and
a locator cell conveying the orientation of the bar code to the reading device;
wherein the locator ring and the at least one data ring are circular, have a finite width, and are concentric, without any gap between adjacent rings; and
wherein the bar code has a capacity computed as:
Capacity=((number of data rings)×(number of data cells per ring))−1.
2. The circular bar code of claim 1 , wherein the locator cell is defined by a gap in the locator ring and a single data cell located in a data ring adjacent the locator ring, the single data cell being adjacent the gap and the same color as the locator ring.
3. The circular bar code of claim 2 , wherein the circumferential and radial dimensions of the locator cell convey the data cell size to the reading device.
4. The circular bar code of claim 1 , wherein the locator ring is inside the at least one data ring.
5. The circular bar code of claim 1 , wherein the locator ring is outside the at least one data ring.
6. The circular bar code of claim 1 , wherein the bar code has a positive color scheme.
7. The circular bar code of claim 1 , wherein the bar code has a negative color scheme.
8. The circular bar code of claim 1 , wherein each data cell is a binary storage location, and wherein a data cell of the same color as the locator ring has a value of “1” and a data cell of the opposite color as the locator ring has a value of “0.”
9. The circular bar code of claim 1 , wherein the locator ring and the at least one data ring together define a symbol area, and wherein the circular bar code further comprises inner and outer quiet regions immediately inside and outside the symbol area for providing background contrast to enable the reading device to properly locate, identify, and read data in the bar code.
10. A circular bar code comprising:
at least one data ring, each data ring comprising a plurality of data cells arranged side-by-side in a circle;
means for conveying the location and size of the bar code to a reading device; and
means for conveying the orientation of the bar code to the reading device;
wherein the at least one data ring is circular and has a finite width; and
wherein the bar code has a capacity computed as:
Capacity=((number of data rings)×(number of data cells per ring))−1.
11. The circular bar code of claim 10 , wherein the means for conveying the orientation of the bar code has circumferential and radial dimensions for conveying the data cell size to the reading device.
12. The circular bar code of claim 10 , further comprising means for providing background contrast to enable the reading device to properly locate, identify, and read data in the bar code.
13. A circular bar code comprising:
at least one data ring, each data ring comprising a plurality of data cells arranged side-by-side in a circle;
a locator ring, the locator ring being a solid color and conveying the location and size of the bar code to a reading device, the locator ring and the at least one data ring together defining a symbol area;
inner and outer quiet regions immediately inside and outside the symbol area for providing background contrast to enable the reading device to properly locate, identify, and read data in the bar code; and
a locator cell conveying the orientation of the bar code to the reading device, wherein the locator cell is defined by a gap in the locator ring and a single data cell located in a data ring adjacent the locator ring, the single data cell being adjacent the gap and the same color as the locator ring, and wherein the circumferential and radial dimensions of the locator cell convey the data cell size to the reading device;
wherein the locator ring and the at least one data ring are circular, have a finite width, and are concentric, without any gap between adjacent rings; and
wherein the bar code has a capacity computed as:
Capacity=((number of data rings)×(number of data cells per ring))−1.
14. The circular bar code of claim 13 , wherein the locator ring is inside the at least one data ring.
15. The circular bar code of claim 13 , wherein the locator ring is outside the at least one data ring.
16. The circular bar code of claim 13 , wherein the bar code has a positive color scheme.
17. The circular bar code of claim 13 , wherein the bar code has a negative color scheme.
18. The circular bar code of claim 13 , wherein each data cell is a binary storage location, and wherein a data cell of the same color as the locator ring has a value of “1” and a data cell of the opposite color as the locator ring has a value of “0.