Bar code reader, bar code reading method and computer readable medium

A bar code reading method of scanning a bar code containing three identifying bars each having a fixed pattern and data characters of two blocks interposed between the identifying bars, detecting a bright/dark pattern on a trajectory of the scanning, and demodulating data coded into the bar code on the basis of the bright/dark pattern, said method comprising:

• a step of demodulating the bright/dark patterns on the trajectories each passing through at least one of the three identifying bars;
• a step of obtaining the demodulating data corresponding to all of the bar code by synthesizing the plural pieces of demodulated data obtained by demodulating the bright/dark patterns;
• and
• a step of validating the demodulated data corresponding to all of the bar code only when the plural pieces of demodulated data obtained by demodulating the bright/dark patterns on the trajectories each passing through any one of the blocks overlap at least partially in the block and the overlapped portions of each of demodulated data are coincident with each other within the predetermined block.

A computer readable medium stored with a bar code program for enabling a computer to which bright/dark pattern data obtained by scanning a bar code obtaining three identifying bars each having a fixed pattern and data characters of two blocks interposed between the identifying bars are inputted, to execute:

• a step of demodulating the bright/dark patterns on the trajectories each passing through at least one of the three identifying bars;
• a step of obtaining the demodulated data corresponding to all of the bar code by synthesizing the plural pieces of demodulated data obtained by demodulating the bright/dark patterns;
• a step of judging whether or not the plural pieces of demodulated data obtained by demodulating the bright/dark patterns on the trajectories each passing through any one of the blocks are overlapped at least partially in the block;
• a step of judging whether or not, when judging that the plural pieces of demodulated data overlap at least partially in the block, the overlapped portions are coincident with each other;
• and
• a step of validating the demodulated data corresponding to all of the bar code only when it is judged that the overlapped portions are coincident with each other within the predetermined block.

A bar coder reader scanning a bar code, detecting a bright/dark pattern on a trajectory of the scanning, and demodulating data coded into the bar code on the basis of the bright/dark pattern, said reader comprising:

• a demodulating unit obtaining plural pieces of demodulated data by demodulating the bright/dark patterns on the trajectories;
• a demodulated data synthesizing unit obtaining the demodulated data corresponding to all of the bar code by synthesizing the plural pieces of demodulated data obtained by said demodulating unit;
• an overlap judging unit judging whether or not the plural pieces of demodulated data obtained by that said demodulating unit demodulates the bright/dark patterns on the trajectories each passing through any one of the blocks overlap at least partially in the block;
• a coincidence judging unit judging whether or not overlapped portions of the plural pieces of demodulated data judged by said overlap judging unit as being overlapped are coincident with each other;
• and
• a demodulated data validating unit validating the demodulated data reproduced by said demodulated data synthesizing unit only when said coincidence judging unit judges that the overlapped portions are coincident with each other.