Bar code symbology capable of encoding 16-bit characters, and method and apparatus for printing and reading same

• US 5,939,700 A
• Filed: 11/12/1997
• Issued: 08/17/1999
• Est. Priority Date: 11/05/1993
• Status: Expired due to Fees

• Current Assignee: Intermec IP Corporation (Honeywell International Inc.)
• Original Assignee: Intermec IP Corporation (Honeywell International Inc.)
• Inventors: Ackley, H. Sprague
• Primary Examiner(s): LE, THIEN MINH
• Application Number:
  US08/967,622
• Time in Patent Office: 643 Days
• Field of Search: 235/462, 235/472, 235/454, 235/463, 235/467, 235/469, 235/464, 235/494
• US Class Current: 235/462.01
• CPC Class Codes: G06K 1/121 by printing code marks applying code marks to labels B65C9/46; marking or coding completed packages B65B61/26
• CPC Class Codes: G06K 19/06028 using bar codes
• CPC Class Codes: G06K 7/14 using light without selection of wavelength, e.g. sensing reflected white light G06K7/10831 - G06K7/1097 take precedence

Abstract

The new bar code symbology under the present invention directly encodes one symbol character for each human readable character in known 16-bit data character encoding standards such as Unicode. The symbology employs six bars and six spaces for each symbol, and has a total width of 21 modules for each symbol character, and thus is a (21,6) symbology. Bars and spaces in symbol characters having greater than six modules in width are eliminated, as are bounding strings of more than six adjacent one-wide elements. As a result, the symbology is wand scannable, readily printable, and can be read when out-of-focus. Parity codes are employed, to enable Hamming distances between symbol characters to be maximized, and thereby improve data security of the symbology (e.g, the total width of all bars in each symbol character is equal to an even number). As a result, the present symbology preferably encodes 80,077 data characters. By employing a prime number of symbol characters, the symbology provides robust error correcting and error detection capabilities. The encoded data characters include not only the Unicode characters, but also compressed three- and four-digit numeric characters, and compressed pairs of alphanumeric characters, each encoded as a single unique symbol character. A set of start characters under the symbology not only indicate the start of a given label but also encode data characters therein.

Claims

1. A method for printing a surface with at least one bar code symbol, the method comprising the step of providing adjacently positioned groups of sequential marks, the groups including six marks at selectively spaced intervals within the groups, the marks being selected from a plurality of different widths that are integer multiples of a first width, and including six blank intervals within each of the groups, each of the blank intervals being selected from a plurality of different widths which are integer multiples of a second width, where each group has a total width substantially equal to 21 times the first width or the second width.

2. The method of claim 1 wherein the step of providing adjacently positioned groups of sequential marks includes providing up to 81,796 different groups of marks and blank intervals between the marks that represent up to 81,796 different patterns.

3. The method of claim 1 wherein the step of providing adjacently positioned groups of sequential marks includes providing one group of sequential marks in the symbol that represents a check character, the one group being selected from one of 81,796 of 80,130 groups of marks and blank intervals.

4. The method of claim 1 wherein the step of providing adjacently positioned groups of sequential marks includes providing groups of sequential marks and blank intervals that have the plurality of different widths, the plurality of different widths not being greater than six times the first and second width, respectively.

5. The method of claim 1 wherein the step of providing adjacently positioned groups of sequential marks includes providing at least 65,536 groups of sequential marks that identify a set of data characters under a 16-bit code standard.

6. The method of claim 1 wherein the step of providing adjacently positioned groups of sequential marks includes providing a plurality of groups of sequential marks that represent start characters, wherein a first part of each of the start characters is identical, while a second part is unique with respect to each of the start characters, and wherein the unique part encodes at least one data character.

7. The method of claim 1 wherein the step of providing adjacently positioned groups of sequential marks includes providing each group of sequential marks and blank intervals as having not greater than six adjacent marks and blank intervals that have one times the first and second width, respectively, at either end of the group.

8. The method of claim 1 wherein the step of providing adjacently positioned groups of sequential marks includes the step of automatically generating the groups of sequential marks, wherein the plurality of different widths of the marks and blank intervals are not greater than six times the first and second width, respectively, and each group has less than seven adjacent marks and blank intervals at either end of the group that have one times the first and second width, respectively.

9. The method of claim 1 wherein the step of providing adjacently positioned groups of sequential marks includes providing a plurality of groups of sequential marks that represent start characters that are unique with respect to other symbology standards.

10. The method of claim 1 wherein the first and second widths in the step of providing are approximately equal.

11. The method of claim 1 wherein the step of providing adjacently positioned groups of sequential marks includes providing at least one set of groups of sequential marks that each identifies three or more numeric data characters.

12. The method of claim 1 wherein the step of providing adjacently positioned groups of sequential marks includes providing first and second groups of sequential marks in the symbol that represents first and second error-correction characters.

13. The method of claim 1 wherein the step of providing adjacently positioned groups of sequential marks includes providing 80,111 groups.

14. The method of claim 1 wherein the step of providing adjacently positioned groups of sequential marks includes providing each group as having at least one mark having one times the first width.

15. A bar code structure comprising a plurality of adjacently positioned bars having spaces between the bars, groups of at least four bars and four spaces defining individual data characters, each group having at least four bars and four spaces selected from a plurality of different widths that are integer multiples of first and second widths, respectively, and wherein each group has a total width substantially equal to at least 20 times the first or second width.

16. The bar code structure of claim 15 wherein the groups of bars and spaces provide up to 81,796 different groups that represent up to 81,796 different data characters.

17. The bar code structure of claim 15 wherein the groups of bars and spaces provide one group that represents a check character, the one group being selected from one of at least 65,536 of 81,796 groups of bars and spaces.

18. The bar code structure of claim 15 wherein the plurality of different widths are not greater than six times the first or second width.

19. The bar code structure of claim 15 wherein the groups provide at least 65,536 groups of bars and spaces that identify a set of data characters under a 16-bit code standard.

20. The bar code structure of claim 15 wherein the groups of bars and spaces provide a plurality of groups that represent start characters, wherein a first part of each of the start characters is identical, while a second part is unique with respect to each of the start characters, and wherein the unique part encodes at least one data character.

21. The bar code structure of claim 15 wherein each group has at most six adjacent bars and spaces at either end of the group that have one times the first and second width, respectively.

22. The bar code structure of claim 15 wherein the plurality of groups of bars and spaces represent start characters that are unique with respect to other symbology standards.

23. The bar code structure of claim 15 wherein the first and second widths are approximately equal.

24. The bar code structure of claim 15 wherein at least one set of groups of bars and spaces identifies numeric compression of data characters.

25. The bar code structure of claim 15 wherein each group includes 6 bars and 6 spaces, and has a total width substantially equal to 21 times the first and second width, respectively, and wherein the groups provide up to 80,077 different groups that represent up to 80,077 different data characters.

26. The bar code structure of claim 15 wherein the groups of bars and spaces provide first and second groups that represent first and second error correction characters.

27. The bar code structure of claim 15 wherein each group has at least one bar having one times the first width.

28. A method of decoding a bar code label formed on a surface, the method comprising the steps of:

imaging the bar code label to produce a signal representative of each of a plurality of symbol characters therefrom;

analyzing the signal to identify the symbol characters, each symbol character represented by six bars and six spaces, wherein each bar and each space being selected from integer multiples of first and second widths, respectively, and wherein each symbol character has a total width approximately equal to 21 times the first or second width; and

converting each symbol character into a corresponding symbol code.

29. A bar code structure comprising a plurality of adjacently positioned bars having spaces between the bars, groups of bars and spaces defining individual data characters, wherein a subset of the groups of bars and spaces define a set of start characters, wherein each group in the subset has a first portion identical to each of the other groups in the subset, and a second portion unique to each of the groups in the subset, and wherein the unique portion encodes at least one data character.