JPH0799528B2 - Add-on bar code reader - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to improvements in add-on bar code readers. UPC / A, UPC / E, EAN / 13, EAN / 8 etc. bar code (hereinafter referred to as main bar code) with a 2- or 5-digit bar code (hereinafter referred to as add-on code) When reading a label to which a 5-digit add-on code is added in an add-on bar code reader that reads both of them, 2-digit and 5-digit data may come up depending on the scanning direction of the beam. At this time, parity check is OK for both data.
In that case, the reading rate is lowered because the reading is NG as a double label error. Therefore, an add-on bar code reader that improves this is required.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing a 2-digit add-on bar code configuration, FIG. 4 is a diagram showing a 5-digit add-on bar code configuration, FIG. 5 is a diagram showing a beam scanning example, and FIG. 6 is a 2-digit add-on. Parity check explanatory diagram, FIG. 7 is a parity check explanatory diagram of a 5-digit add-on.

FIG. 3 shows the structure of an add-on bar code in which a 2-digit add-on code section is added to the main bar code section of UPC / A or the like. Of these, the 2-digit add-on code part is SLGB (Special Left Guard Bar), 1st
It is composed of characters X, DB (delineate bar) and second character Y, and ODD or E is used for X and Y.
The value of VEN is given. This ODD / EVEN is
A 2-digit number is divided by 4 as a decimal number, and the remainder is determined so that the ODD / EVEN configuration shown in FIG. 6 is obtained.

FIG. 4 shows a five-digit add-on bar code configuration. SLGB, the first character, DB, and characters are repeated to form five digits. Then, by the numerical value α of the first digit of [(sum of numerical values of odd digits) × 3] + [(sum of numerical values of even digits) × 9], the ODD / EVE shown in FIG. 7 is obtained.
The ODD / EVEN of each of V, W, X, Y, and Z is determined so as to have the N configuration.

A stationary bar code reader for reading these add-on bar codes scans a label with a light beam a plurality of times, and as shown in FIG. 5, a beam passing through the left block of the main bar code section. The data obtained by the beam C passing through A and the right block and the add-on code section is demodulated, and the normality of each data is checked. If the check is OK and there are two or more types of demodulated data in each part, it is determined as a double label error and read NG.

The check (parity check) of the add-on code section is performed by performing the above-mentioned calculation and ODD / EV.
The correctness of the EN configuration is checked.

[0007]

When reading the bar code label of the 5-digit add-on, if the beam C and the beam B shown in FIG. 5 are scanned, the 5-digit and 2-digit add-on codes will come up. Since the stop code or the like is not added to the code portion, both cases may be checked OK. For example, if the five digits are E3, E1, O4, O1, O7, the two digits are E3, E1. When this is subjected to a parity check, the remainder is 31/4 and the remainder is 3. Therefore, EVEN and EVEN are obtained as shown in FIG.
It becomes K. As described above, despite the normal reading, a double label error occurs depending on the scanning direction of the beam, which is one of the causes of lowering the reading rate.

It is an object of the present invention to provide an add-on bar code reading device which prevents the reading rate from decreasing due to the above reasons.

[0009]

Description will be given by extracting corresponding functional portions from the configuration diagram of one embodiment of FIG. Reference numeral 7 is a double label error check unit, which is an n-digit demodulated data when two sets of demodulated data of n-digit and m-digit that have passed a predetermined check for the add-on code are present in the demodulated data obtained by reading the add-on barcode. First m of data
When the ODD / EVEN configuration and the numerical data are compared between the digit and the m-digit demodulated data, respectively, and when both match, n
Adopts digitized demodulation data to make the reading of add-on code normal.

[0010]

[Function] Of the demodulated data that has passed the predetermined check,
When demodulated data of n-digit add-on code and m-digit add-on code exists, double label error check unit 7
Is a comparison between the first m digits of the n-digit demodulated data and the m-digit demodulated data with respect to the ODD / EVEN configuration and the numerical data. Is read normally.

As described above, since the double label error caused by the beam scanning direction despite the normal reading is relieved, the reading rate is improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram of an embodiment, and FIG. 2 is a check operation flowchart. In FIG. 1, the reading unit 1 irradiates a laser beam, receives the reflected light from the barcode label, converts it into an electric signal, binarizes it, and outputs it. The demodulation unit 2 demodulates the input binarized data, performs a predetermined check, and outputs the demodulated data if normal.
A bar width conversion unit 3 for converting binarized data into bar width data, a code conversion unit 4 for demodulating based on the bar width data and storing the demodulated data in the memory 5, a predetermined check on the demodulated data and reading OK / It comprises a check unit 6 for judging NG and a double label error check unit 7 for checking the present invention when a double label error of an add-on code occurs.

With the above structure, the following check operation is performed. A plurality of demodulated data are obtained by reading the bar code label shown in FIG. 2 once and stored in the memory 5. (1) The checking unit 6 first checks the main bar code for the plurality of demodulated data. That is, when the demodulated data of each of the left and right blocks is one type and the predetermined check by the combination is OK, the main bar code check is OK. (2) Next, the parity check of the add-on code is performed.
Here, when the check OK data has 5 digits or 2 digits and each has one type, the reading is OK, and when there are two types of check OK data, it is passed to the double label error checking unit 7 as a double label. (3) The double label error check unit 7 makes the reading NG when the two sets of data both have 2 digits or 5 digits, and performs the following check when they have 2 digits and 5 digits.

First, the match / mismatch of the ODD / EVEN configuration is checked between the first two digits of the five-digit data and the two-digit data. Then, if they do not match, the reading is set to NG. If they match, the numerical data are subsequently compared. Then, if the numerical data do not match, it is determined to be read NG,
If they match, the 5-digit data is adopted as a normal add-on code, and the reading of the add-on code is OK.

As described above, when a double label error occurs, the ODD / EVEN configuration and the numerical data are compared for the first two digits, and if they match, the one with the larger digit number is adopted. Since the reading is OK, the double label error based on the beam scanning direction is relieved, and the reduction of the reading rate can be prevented.

[0016]

As described above, according to the present invention, since the double label error based on the beam scanning direction is relieved, the reading rate is improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment.

[Fig. 2] Check operation flowchart

FIG. 3 is a diagram showing a barcode configuration of a 2-digit add-on.

FIG. 4 is a diagram showing a barcode configuration of a 5-digit add-on.

FIG. 5 is a diagram showing an example of beam scanning.

[Figure 6] Parity check explanatory diagram for 2-digit add-on

[Figure 7] 5 digit add-on parity check explanatory diagram

[Explanation of symbols]

 1 reading unit 2 demodulation unit 3 bar width conversion unit 4 code conversion unit 5 memory 6 check unit 7 double label error check unit

Claims (1)

[Claims] 1. An add-on bar code reader for reading an add-on bar code in which an n-digit add-on code is added to a main bar code and an add-on bar code in which an m-digit add-on code having a number of digits smaller than n is added. If two sets of demodulated data of n digits and m digits that have passed a predetermined check for the add on code are present in the demodulated data obtained by reading the add-on bar code, the first m digits of the n-digit demodulated data are present. A double-label error in which the ODD / EVEN configuration and the numerical data are compared between the above-mentioned and the m-digit demodulated data, and when they match each other, the n-digit demodulated data is adopted and the reading of the add-on code is judged to be normal. An add-on bar code reader having a check section (7).